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Build: chase down and solve spurious SVG icon rebuilds

Browse source 
Many years ago, I integrated the IconSvgRenderer (written by Joel Holdsworth)
directly into the SCons build by means of a custom builder with an ''emitter function''.

The build as such works fine and automatically determines which icons can be
generated from a given SVG source. However, those SVG icons tend to be rebuilt
very frequently, even while none of the SVG sources has changed.

Basically this was more of an annoyance, since we have now about 15 icons
and the rendering is really fast ... it is just ugly, especially on
incremental builds (and it could become a problem once we have a
massive amount of graphics to process.

So I took the opportunity to take close look now, since I am doing
uninspiring clean-up work since several weeks now. But that problem
turned out to be quite insidious and hard to spot.

First, AI set me off into a completely wrong angle, since it is ''not''
caused by a missing string representation of the custom Action class.
However, from there I went to watching the target checks with the debugger,
and this eventually got me to realise, that SCons mistakenly detects
a change in the Executor / the Action class.

The root cause is, that we invoke Python code from an external Module,
IconSvgRenderer.py, and this is »materialised« by SCons automatically
into a string representation, which includes memory addresses of functions
in that module. And that yields a signature, that is, quite obviously,
not stable, even while you end up sometimes with loading the code to
the same memory location.

As a solution / workaround, we now subclass the standard implementation
from SCons and override the signature function; instead of fingerprinting
the binary code, we just compute a MD5 over the python source file,
which can be easily achieved with the help of the File-Node from SCons.

Essential resources:
https://scons.org/doc/4.8.0/HTML/scons-user.html#chap-builders-writing

...and the Reference / Manpage of SCons
https://scons.org/doc/4.8.0/HTML/scons-man.html#action_objects

SCons/Action.py
SCons/Node/__init__.py
This commit is contained in:
Fischlurch 2025-11-27 02:08:50 +01:00
parent 8b2a329898
commit d24e025de2
3 changed files with 866 additions and 22 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

66
admin/scons/LumieraEnvironment.py
View file

@ -16,7 +16,8 @@
from os import path
import SCons.SConf
from SCons.Action import Action
from SCons.Action import Action, FunctionAction
from SCons.Script import File as SConsFile
from SCons.Environment import Environment
from Buildhelper import *
@ -45,7 +46,8 @@ class LumieraEnvironment(Environment):
self.Tool("BuilderDoxygen")
self.Tool("ToolDistCC")
self.Tool("ToolCCache")
register_LumieraResourceBuilder(self)
register_LumieraIconBuilder(self)
register_LumieraResourceBuilders(self)
register_LumieraCustomBuilders(self)
def _anchor_relative(self, key):
@ -124,12 +126,13 @@ class LumieraConfigContext(ConfigBase):
###############################################################################
####### Lumiera custom tools and builders #####################################
def register_LumieraResourceBuilder(env):
""" Registers Custom Builders for generating and installing Icons.
def register_LumieraIconBuilder(env):
""" Registers a custom Builder for generating and installing Icons from SVG.
Additionally you need to build the tool (rsvg-convert.c)
used to generate png from the svg source using librsvg.
"""
@ -138,13 +141,39 @@ def register_LumieraResourceBuilder(env):
renderer.rsvgPath = env.subst("$TARGDIR/rsvg-convert").removeprefix('#')
# # the prefix '#' is a SCons specific convention,
# # which the external tool can not handle
#
# MD5 signature for this specific python source code...
thisCodeSignature = SConsFile(__file__).get_csig() + SConsFile(renderer.__file__).get_csig()
thisCodeSignature = bytearray(thisCodeSignature, 'utf-8')
def invokeRenderer(target, source, env):
source = str(source[0])
targetdir = env.subst(env.path.buildIcon).removeprefix('#')
renderer.main([source,targetdir])
return 0
class IconRenderAction(FunctionAction):
""" SCons Action subclass to provide a controlled cache signature.
@note: usually it would be sufficient to pass just a callable to the Builder,
however, our implementation calls into an external Python module and thus
the default signature from SCons would not be stable, since it relies
on a code representation including memory addresses. Without this,
the icons would be frequently rebuilt unnecessarily.
"""
def __init__(self):
FunctionAction.__init__(self, IconRenderAction.invokeRenderer
, {'cmdstr' : "rendering Icon: $SOURCE --> $TARGETS"}
)
def get_contents(self, target, source, env):
""" a stable signature based on the source code """
return thisCodeSignature
@staticmethod
def invokeRenderer(target, source, env):
""" render the SVG icon with libRSVG """
source = str(source[0])
targetdir = env.subst(env.path.buildIcon).removeprefix('#')
renderer.main([source,targetdir])
return 0
def createIconTargets(target,source,env):
""" parse the SVG to get the target file names """
source = str(source[0])
@ -162,6 +191,20 @@ def register_LumieraResourceBuilder(env):
return (generateTargets, source)
buildIcon = env.Builder( action = IconRenderAction()
, single_source = True
, emitter = createIconTargets
)
env.Append(BUILDERS = {'IconRender' : buildIcon})
def register_LumieraResourceBuilders(env):
""" Registers further Custom Methods for installing various Resources.
"""
def IconResource(env, source):
""" copy icon pixmap to corresponding icon dir. """
subdir = getDirname(str(source))
@ -227,11 +270,6 @@ def register_LumieraResourceBuilder(env):
return env.InstallAs(toInstall, source) # this renames at target
buildIcon = env.Builder( action = Action(invokeRenderer, "rendering Icon: $SOURCE --> $TARGETS")
, single_source = True
, emitter = createIconTargets
)
env.Append(BUILDERS = {'IconRender' : buildIcon})
env.AddMethod(IconResource)
env.AddMethod(GuiResource)
env.AddMethod(ConfigData)

2
admin/scons/Setup.py
View file

@ -59,7 +59,7 @@ def defineBuildEnvironment():
"""
EnsureSConsVersion(2,0)
EnsurePythonVersion(2,6)
Decider('MD5-timestamp') # detect changed files by timestamp, then do a MD5
Decider('content-timestamp') # detect changed files by timestamp, then do a MD5
buildVars = Variables([OPTCACHE, CUSTOPTFILE])
Options.defineCmdlineVariables(buildVars)

820
wiki/thinkPad.ichthyo.mm
View file

@ -159345,6 +159345,39 @@ unsigned int ThreadIdAsInt = *static_cast<unsigned int*>(static_cast<vo
<linktarget COLOR="#6377c3" DESTINATION="ID_1068770252" ENDARROW="Default" ENDINCLINATION="-689;109;" ID="Arrow_ID_718963929" SOURCE="ID_1458418945" STARTARROW="None" STARTINCLINATION="-517;-37;"/>
<node CREATED="1764024019333" ID="ID_588528493" MODIFIED="1764024031140" TEXT="env.AddPostAction(target, actionObj)"/>
</node>
<node CREATED="1764207716026" FOLDED="true" ID="ID_1341695959" MODIFIED="1764208020158" TEXT="Build-Signaturen">
<icon BUILTIN="info"/>
<node CREATED="1764207727765" ID="ID_962463267" MODIFIED="1764207754499" TEXT="Basis ist die Node-Klasse von SCons">
<node CREATED="1764207800549" ID="ID_845916718" MODIFIED="1764207812525" TEXT="verwendet eine Signatur des Objekts selber"/>
<node CREATED="1764207813326" ID="ID_729825340" MODIFIED="1764207828653" TEXT="sowie verkette Signaturen aller &#xbb;Quellen&#xab;"/>
<node CREATED="1764207829812" ID="ID_127065715" MODIFIED="1764207841444" TEXT="siehe FS.Node.is_changed()"/>
</node>
<node CREATED="1764207755250" ID="ID_583034890" MODIFIED="1764207780513" TEXT="praktisch relevant: SCons/Script.File / bzw. Dir"/>
<node CREATED="1764207853363" ID="ID_881837314" MODIFIED="1764207909382" TEXT="speziell f&#xfc;r custom-Builder: auch die Action-Implementierung geht in die Signatur ein">
<arrowlink COLOR="#597d8e" DESTINATION="ID_923448890" ENDARROW="Default" ENDINCLINATION="76;-515;" ID="Arrow_ID_657949434" STARTARROW="None" STARTINCLINATION="1190;40;"/>
<node CREATED="1764207929414" HGAP="31" ID="ID_318656375" MODIFIED="1764207974241" TEXT="hier wird der Python-Code selber in eine Signatur &#xfc;bersetzt" VSHIFT="38"/>
<node BACKGROUND_COLOR="#e0ceaa" COLOR="#690f14" CREATED="1764207950454" ID="ID_1548024861" LINK="#ID_1471993413" MODIFIED="1764207982580" TEXT="Vorsicht Falle: externe Python-Module machen die Signatur instabil">
<icon BUILTIN="messagebox_warning"/>
</node>
</node>
</node>
</node>
</node>
<node CREATED="1764108132962" ID="ID_1452199598" MODIFIED="1764108840312" TEXT="Build-Diagnostik">
<linktarget COLOR="#2d68b4" DESTINATION="ID_1452199598" ENDARROW="Default" ENDINCLINATION="-888;146;" ID="Arrow_ID_26997900" SOURCE="ID_427355838" STARTARROW="None" STARTINCLINATION="-182;25;"/>
<node CREATED="1764108138789" ID="ID_1171380689" LINK="https://scons.org/doc/4.8.0/HTML/scons-user.html#id1526" MODIFIED="1764108141953" TEXT="--tree">
<node CREATED="1764108229770" ID="ID_690870020" MODIFIED="1764108474372" TEXT="listet den Dependency-Graph">
<icon BUILTIN="info"/>
<node CREATED="1764108479472" ID="ID_1985135497" MODIFIED="1764108486647" TEXT="Tip: Target explizit angeben"/>
</node>
<node CREATED="1764108239033" ID="ID_442105954" MODIFIED="1764108367975" TEXT="--tree=all : kompletten Graph, nach jedem top-level Target build"/>
<node CREATED="1764108369318" ID="ID_859936389" MODIFIED="1764108386379" TEXT="--tree=derived : only derived(target) nodes"/>
<node CREATED="1764108391271" ID="ID_1166635511" MODIFIED="1764108407942" TEXT="status : Modifier, gibt Node-Status mit aus"/>
<node CREATED="1764108426985" ID="ID_928783325" MODIFIED="1764108457058" TEXT="--prune : gibt nur die erste incidenz im DAG aus, weitere abgek&#xfc;rzt (eckige Klammer)"/>
</node>
<node CREATED="1764106864395" ID="ID_1037266835" LINK="https://scons.org/doc/4.8.0/HTML/scons-user.html#id1522" MODIFIED="1764106877130" TEXT="--debug=explain">
<node CREATED="1764108178428" ID="ID_1600861540" MODIFIED="1764108204300" TEXT="Gibt eine Begr&#xfc;ndung warum jedes Artefakt tats&#xe4;chlich gebaut wird"/>
<node CREATED="1764108208348" ID="ID_1613894206" MODIFIED="1764108226882" TEXT="nicht gebaute Artefakte hinerlassen keine Spur"/>
</node>
</node>
</node>
@ -168298,6 +168331,9 @@ that situation will improve in forseeable future.</pre>
</node>
<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1752070293350" ID="ID_391826628" MODIFIED="1752070305584" TEXT="top-Level-Seiten durchk&#xe4;mmen">
<icon BUILTIN="flag-yellow"/>
<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1764037326150" ID="ID_253173738" MODIFIED="1764037351953" TEXT="BuildDrone kann weg">
<icon BUILTIN="yes"/>
</node>
</node>
<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1752070265482" ID="ID_927720852" MODIFIED="1756773347225" TEXT="relevante Links aktualisieren">
<icon BUILTIN="flag-yellow"/>
@ -170257,14 +170293,54 @@ that situation will improve in forseeable future.</pre>
<node CREATED="1762803541300" ID="ID_1198625842" MODIFIED="1762803563377" TEXT="Doku zum debianDepot.txt">
<linktarget COLOR="#b5768e" DESTINATION="ID_1198625842" ENDARROW="Default" ENDINCLINATION="102;11;" ID="Arrow_ID_1663167652" SOURCE="ID_834370322" STARTARROW="None" STARTINCLINATION="-35;55;"/>
</node>
<node CREATED="1764080462839" ID="ID_40707028" MODIFIED="1764080495980" TEXT="Doku zum Debian-Paket">
<richcontent TYPE="NOTE"><html>
<head/>
<body>
<p>
technical/build/LumieraDebianPackage.html
</p>
</body>
</html></richcontent>
<node CREATED="1764080499102" ID="ID_600067904" MODIFIED="1764080556468">
<richcontent TYPE="NODE"><html>
<head/>
<body>
<p>
enth&#228;lt auch Beschreibung des <i>Installation-Bundle</i>
</p>
</body>
</html></richcontent>
<richcontent TYPE="NOTE"><html>
<head/>
<body>
<p>
die ist gut und auch n&#252;tzlich dort; k&#246;nnte aber auch &#252;bernommen werden in die Beschreibun des Buildsystems
</p>
</body>
</html></richcontent>
<icon BUILTIN="idea"/>
</node>
<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1763227392438" ID="ID_1661490899" MODIFIED="1763227659040" TEXT="auch SCons/Buildsystem-Doku erg&#xe4;nzen">
<linktarget COLOR="#e91b19" DESTINATION="ID_1661490899" ENDARROW="Default" ENDINCLINATION="-549;-29;" ID="Arrow_ID_1418896649" SOURCE="ID_1851495604" STARTARROW="None" STARTINCLINATION="-497;37;"/>
<node BACKGROUND_COLOR="#f8f1cb" COLOR="#a50125" CREATED="1764080558767" ID="ID_1614946590" MODIFIED="1764080580506" TEXT="enth&#xe4;lt Beschreibung des Release-Prozesses &#x27f9; obsolet durch Git-Flow">
<icon BUILTIN="messagebox_warning"/>
</node>
<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1764080599920" ID="ID_1082461848" MODIFIED="1764080620395" TEXT="Fehlt: Informationen zum DEB-Packaging selber">
<icon BUILTIN="flag-yellow"/>
<node CREATED="1763227450701" ID="ID_625201328" MODIFIED="1763227464085" TEXT="Erl&#xe4;uterung der Installation fehlt"/>
<node CREATED="1763227487535" ID="ID_1935413427" MODIFIED="1763227501052" TEXT="Prinzip der Bundle-Installation klarstellen"/>
<node CREATED="1763227465012" ID="ID_503183649" MODIFIED="1763227483918" TEXT="sollte dabei auch nochmal die $SUBSTVAR erkl&#xe4;ren"/>
<node CREATED="1763250317834" ID="ID_1201363565" MODIFIED="1763250560534" TEXT="...und wie Build-Variable konfiguriert und eingelesen werden">
</node>
</node>
</node>
<node COLOR="#338800" CREATED="1763227392438" FOLDED="true" ID="ID_1661490899" MODIFIED="1764096967295" TEXT="auch SCons/Buildsystem-Doku erg&#xe4;nzen">
<linktarget COLOR="#2b9293" DESTINATION="ID_1661490899" ENDARROW="Default" ENDINCLINATION="-549;-29;" ID="Arrow_ID_1418896649" SOURCE="ID_1851495604" STARTARROW="None" STARTINCLINATION="-497;37;"/>
<icon BUILTIN="button_ok"/>
<node BACKGROUND_COLOR="#ccb59b" COLOR="#6e2a38" CREATED="1764081254214" ID="ID_1143188110" MODIFIED="1764081274555" TEXT="die Basis ist gut">
<font ITALIC="true" NAME="SansSerif" SIZE="14"/>
<icon BUILTIN="yes"/>
</node>
<node COLOR="#435e98" CREATED="1764082066790" ID="ID_1241209598" MODIFIED="1764090439442" TEXT="ein How-to w&#xe4;re sinnvoll"/>
<node COLOR="#435e98" CREATED="1763227450701" ID="ID_625201328" MODIFIED="1764093057004" TEXT="Erl&#xe4;uterung der Installation fehlt"/>
<node COLOR="#435e98" CREATED="1763227487535" ID="ID_1935413427" MODIFIED="1764090447590" TEXT="Prinzip der Bundle-Installation klarstellen"/>
<node COLOR="#435e98" CREATED="1763227465012" ID="ID_503183649" MODIFIED="1764096941258" TEXT="sollte dabei auch nochmal die $SUBSTVAR erkl&#xe4;ren"/>
<node COLOR="#435e98" CREATED="1763250317834" ID="ID_1201363565" MODIFIED="1764096943107" TEXT="...und wie Build-Variable konfiguriert und eingelesen werden">
<richcontent TYPE="NOTE"><html>
<head/>
<body>
@ -170301,6 +170377,25 @@ that situation will improve in forseeable future.</pre>
</html></richcontent>
<linktarget COLOR="#c75069" DESTINATION="ID_1201363565" ENDARROW="Default" ENDINCLINATION="762;36;" ID="Arrow_ID_352999319" SOURCE="ID_177915811" STARTARROW="None" STARTINCLINATION="928;75;"/>
</node>
<node COLOR="#338800" CREATED="1764082130592" HGAP="17" ID="ID_1177524473" MODIFIED="1764096938923" TEXT="&#xdc;berarbeitung" VSHIFT="8">
<icon BUILTIN="button_ok"/>
<node COLOR="#338800" CREATED="1764082303931" ID="ID_196512414" MODIFIED="1764083180443" TEXT="bekannte Schw&#xe4;chen von SCons">
<icon BUILTIN="button_ok"/>
</node>
<node COLOR="#338800" CREATED="1764082153954" ID="ID_782192781" MODIFIED="1764090456393" TEXT="Glossar-Teil mit dem SCons-Wiki abgleichen">
<icon BUILTIN="button_ok"/>
</node>
<node COLOR="#338800" CREATED="1764082164347" ID="ID_1067260880" MODIFIED="1764090470592" TEXT="Howto-Sektion hinzuf&#xfc;gen">
<icon BUILTIN="button_ok"/>
<node COLOR="#435e98" CREATED="1764082216853" ID="ID_90076384" MODIFIED="1764090461520" TEXT="einfach bauen"/>
<node COLOR="#435e98" CREATED="1764082226945" ID="ID_1595083052" MODIFIED="1764090461519" TEXT="Tests ausf&#xfc;hren"/>
<node COLOR="#435e98" CREATED="1764082237351" ID="ID_1981359732" MODIFIED="1764090461519" TEXT="Entwickler-Build"/>
<node COLOR="#435e98" CREATED="1764090466590" ID="ID_884784414" MODIFIED="1764090468765" TEXT="Installation"/>
</node>
<node COLOR="#338800" CREATED="1764082185945" ID="ID_285332400" MODIFIED="1764093050186" TEXT="Unterpunkt zur Installation (nach &apos;target directory&apos;)">
<icon BUILTIN="button_ok"/>
</node>
</node>
</node>
</node>
<node BACKGROUND_COLOR="#fdfdcf" COLOR="#ff0000" CREATED="1751808966193" ID="ID_739212271" MODIFIED="1751808977712" TEXT="Git: Release markiert">
@ -171942,7 +172037,7 @@ Since then others have made contributions, see the log for the history.</font></
</node>
</node>
<node COLOR="#435e98" CREATED="1762998892693" ID="ID_1851495604" MODIFIED="1763769292148" TEXT="Scons: &apos;build&apos; - Target baut die Tests">
<arrowlink COLOR="#e91b19" DESTINATION="ID_1661490899" ENDARROW="Default" ENDINCLINATION="-549;-29;" ID="Arrow_ID_1418896649" STARTARROW="None" STARTINCLINATION="-497;37;"/>
<arrowlink COLOR="#2b9293" DESTINATION="ID_1661490899" ENDARROW="Default" ENDINCLINATION="-549;-29;" ID="Arrow_ID_1418896649" STARTARROW="None" STARTINCLINATION="-497;37;"/>
<linktarget COLOR="#783c4a" DESTINATION="ID_1851495604" ENDARROW="Default" ENDINCLINATION="691;48;" ID="Arrow_ID_213409665" SOURCE="ID_1534148044" STARTARROW="None" STARTINCLINATION="504;25;"/>
<icon BUILTIN="broken-line"/>
<node BACKGROUND_COLOR="#e0ceaa" COLOR="#690f14" CREATED="1762999155772" FOLDED="true" ID="ID_1416667212" MODIFIED="1763769210352" TEXT="Vermutung: &apos;vgsuppression&apos; is the culprit">
@ -178941,6 +179036,717 @@ env.Chmod(installed[0], 0o644)</code></pre>
</node>
</node>
</node>
<node BACKGROUND_COLOR="#fafe99" COLOR="#fa002a" CREATED="1764102029325" ID="ID_1892741872" MODIFIED="1764102046515" TEXT="GUI-Icons werden jedesmal gerendert">
<icon BUILTIN="broken-line"/>
<node CREATED="1764102049570" ID="ID_277272095" MODIFIED="1764102134477" TEXT="geht zwar schell ... f&#xfc;hlt sich trotzdem wie ein &#xc4;rgernis an">
<richcontent TYPE="NOTE"><html>
<head/>
<body>
<p>
....und jetzt wird's mal Zeit, das aufzur&#228;umen, da ich nun sowiso schon so viel Aufwand in Clean-up gesteckt habe!!!
</p>
</body>
</html></richcontent>
</node>
<node COLOR="#435e98" CREATED="1764102146471" ID="ID_1539179318" MODIFIED="1764208150740" TEXT="Untersuchung: woran kann das liegen?">
<icon BUILTIN="help"/>
<node CREATED="1764101892845" ID="ID_564048283" LINK="#ID_1609399886" MODIFIED="1764101920401" TEXT="Tools for Fools lesen"/>
<node CREATED="1764101932296" ID="ID_1944545021" LINK="#ID_1819012503" MODIFIED="1764101949118" TEXT="wichtige Abschnitte im User-Manual"/>
<node BACKGROUND_COLOR="#accdc3" COLOR="#3f4015" CREATED="1764102166992" ID="ID_1393752516" MODIFIED="1764102196706" STYLE="fork" TEXT="SO.ai gefragt">
<edge COLOR="#808080" STYLE="bezier" WIDTH="thin"/>
<icon BUILTIN="wizard"/>
<node CREATED="1764102336344" ID="ID_592095631" MODIFIED="1764102351209" TEXT="klingt so, als sollte das per Default einfach funtionieren"/>
<node CREATED="1764102211463" ID="ID_1392795416" MODIFIED="1764102220021" TEXT="weist auf einige typische Probleme hin">
<node CREATED="1764102225751" ID="ID_229316850" MODIFIED="1764102241770" TEXT="Target-Dir gilt als &apos;up-to-date&apos; wenn es existiert"/>
<node CREATED="1764102246953" ID="ID_1026124011" MODIFIED="1764102268998" TEXT="man sollte Sources/Targets als Nodes im Emitter abliefern, nicht als Pfad-Strings"/>
</node>
<node CREATED="1764102295008" ID="ID_1503017324" MODIFIED="1764102335156" TEXT="weitere Empfehlung: Manifest">
<richcontent TYPE="NOTE"><html>
<head/>
<body>
<p>
wenn Files als Seiteneffekt erzeugt werden, kann es helfen, explizit ein Manifest-File als HIlfs-Target zu erzeugen
</p>
</body>
</html></richcontent>
</node>
<node BACKGROUND_COLOR="#ddb78a" COLOR="#690f14" CREATED="1764208498479" ID="ID_1904887062" MODIFIED="1764208573875" TEXT="diese Infos sind alle veraltet und f&#xfc;hren in die falsche Richtung">
<arrowlink COLOR="#d93175" DESTINATION="ID_991502681" ENDARROW="Default" ENDINCLINATION="-1062;46;" ID="Arrow_ID_1837446907" STARTARROW="None" STARTINCLINATION="-347;16;"/>
<icon BUILTIN="broken-line"/>
</node>
</node>
<node CREATED="1764102360444" ID="ID_1728485875" MODIFIED="1764102370963" TEXT="wie definieren wir den Builder">
<node CREATED="1764102372078" ID="ID_665581711" LINK="https://scons.org/doc/4.8.0/HTML/scons-user.html#id1452" MODIFIED="1764105292703" TEXT="sieht ganz generisch aus: verwende den Builder-Konstruktor">
<richcontent TYPE="NOTE"><html>
<head/>
<body>
<p>
...und wir f&#252;gen das erzeugte Objekt per env.Append(BUILDERS=) hinzu. Genau wie in der Doku immer noch dargestellt
</p>
</body>
</html></richcontent>
</node>
<node COLOR="#5b280f" CREATED="1764102389416" ID="ID_1774267905" MODIFIED="1764208475708" TEXT="wir definieren einen Emitter ... liefern dort aber tats&#xe4;chlich Strings">
<icon BUILTIN="messagebox_warning"/>
<icon BUILTIN="button_cancel"/>
</node>
<node CREATED="1764208477631" ID="ID_285362538" MODIFIED="1764208493954">
<richcontent TYPE="NODE"><html>
<head/>
<body>
<p>
Anmerkung: das war alles eine <b>falsche F&#228;hrte</b>
</p>
</body>
</html></richcontent>
</node>
</node>
<node CREATED="1764106854139" ID="ID_427355838" MODIFIED="1764108840312" TEXT="weitere Diagnostik">
<arrowlink COLOR="#2d68b4" DESTINATION="ID_1452199598" ENDARROW="Default" ENDINCLINATION="-888;146;" ID="Arrow_ID_26997900" STARTARROW="None" STARTINCLINATION="-182;25;"/>
<node CREATED="1764106864395" ID="ID_1021754172" LINK="https://scons.org/doc/4.8.0/HTML/scons-user.html#id1522" MODIFIED="1764106877130" TEXT="--debug=explain">
<node CREATED="1764106904725" ID="ID_1133450" MODIFIED="1764106973082" TEXT="Beobachtung...">
<richcontent TYPE="NOTE"><html>
<head/>
<body>
<p>
<font face="Monospaced">Parsing icons/svg/track-unlocked.svg </font>
</p>
<p>
<font face="Monospaced">scons: rebuilding `target/gui/icons/24x24/track-unlocked.png' because: </font>
</p>
<p>
<font face="Monospaced">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;`data/icons/svg/track-unlocked.svg' changed </font>
</p>
<p>
<font face="Monospaced">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;`target/rsvg-convert' changed </font>
</p>
<p>
<font face="Monospaced">rendering Icon: data/icons/svg/track-unlocked.svg --&gt; target/gui/icons/24x24/track-unlocked.png target/gui/icons/22x22/track-unlocked.png target/gui/icons/16x16/track-unlocked.png </font>
</p>
<p>
<font face="Monospaced">Parsing data/icons/svg/track-unlocked.svg </font>
</p>
</body>
</html></richcontent>
</node>
<node CREATED="1764106987789" ID="ID_1940770994" MODIFIED="1764107002835" TEXT="tats&#xe4;chlich: die Quelle gilt immer wieder als &#xbb;changed&#xab;"/>
<node CREATED="1764107003762" ID="ID_1824541409" MODIFIED="1764107011745" TEXT="auch rsvg-convert ist ein Problem">
<node CREATED="1764107900295" ID="ID_1256743232" MODIFIED="1764107955825" TEXT="ist das die explizit deklarierte Dependency?">
<richcontent TYPE="NOTE"><html>
<head/>
<body>
<p>
in tool/SConscript (letzte Zeile)
</p>
<div style="background-color: #eee0b5; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 2px">
<div style="color: #202020; background-color: #eee0b5; font-family: Bitstream Vera Sans Mono; font-size: 9pt; white-space: pre">
<p style="margin-top: 0; margin-right: 0; margin-bottom: 0; margin-left: 0">
<font color="#be9e7b"># Rendering the SVG Icons depends on rsvg-convert</font>
</p>
<p style="margin-top: 0; margin-right: 0; margin-bottom: 0; margin-left: 0">
<font color="#33361c">env.Depends</font><font color="#000000">(</font><font color="#33361c">icons</font><font color="#000000">,</font><font color="#33361c">&#160;rsvg</font><font color="#000000">)</font>
</p>
<p style="margin-top: 0; margin-right: 0; margin-bottom: 0; margin-left: 0">
</p>
</div>
</div>
</body>
</html></richcontent>
</node>
</node>
</node>
<node CREATED="1764108871911" ID="ID_629050370" MODIFIED="1764108889699" TEXT="seltsam: --tree=status zeigt alle Vorl&#xe4;ufer als &apos;C&apos; (current)"/>
</node>
<node COLOR="#435e98" CREATED="1764120051287" FOLDED="true" ID="ID_1281293807" MODIFIED="1764208392228" TEXT="Untersuchung(Debugger)">
<icon BUILTIN="list"/>
<node CREATED="1764120077297" ID="ID_1524223795" MODIFIED="1764120108553" TEXT="scons --debug=explain target/gui/icons/22x22/track-unlocked.png"/>
<node CREATED="1764120114236" ID="ID_932264636" MODIFIED="1764162577987" TEXT="Breakpoint in SCons/Node/__init__.py / Funktion explain() (line 1674)">
<icon BUILTIN="back"/>
<node CREATED="1764162587324" ID="ID_475643458" MODIFIED="1764163075705" TEXT="oder ebenda: Funktion changed() (line 1481)">
<linktarget COLOR="#a9b4c1" DESTINATION="ID_475643458" ENDARROW="Default" ENDINCLINATION="621;0;" ID="Arrow_ID_778123323" SOURCE="ID_1876457275" STARTARROW="None" STARTINCLINATION="195;0;"/>
</node>
</node>
<node CREATED="1764120174122" ID="ID_1623195762" MODIFIED="1764120195567" TEXT="ruft den konfigurierten Decider auf">
<node CREATED="1764120199437" ID="ID_1249854960" MODIFIED="1764163601664" TEXT="diese Auswahl sieht soweit korrekt aus">
<linktarget COLOR="#a9b4c1" DESTINATION="ID_1249854960" ENDARROW="Default" ENDINCLINATION="829;61;" ID="Arrow_ID_251631713" SOURCE="ID_544296417" STARTARROW="None" STARTINCLINATION="219;-9;"/>
</node>
<node CREATED="1764120218857" ID="ID_637424717" MODIFIED="1764120239569" TEXT="Node/FS.py Funktion changed_timestamp_then_content()">
<node CREATED="1764120252593" ID="ID_236911436" MODIFIED="1764120271407" TEXT="mit self == dependency == File: data/icons/svg/track-unlocked.svg"/>
<node CREATED="1764120284389" ID="ID_681945130" MODIFIED="1764120294463" TEXT="target == File: target/gui/icons/24x24/track-unlocked.png"/>
<node CREATED="1764120721510" ID="ID_1446560776" MODIFIED="1764120748885" TEXT="holt sich dann &#xbb;stored_info&#xab; == SConsignEntry">
<node CREATED="1764120763783" ID="ID_1134506067" MODIFIED="1764120774096" TEXT="diese enth&#xe4;lt eine leere &#xbb;build-info&#xab;"/>
<node CREATED="1764120784372" ID="ID_738175198" MODIFIED="1764120798971" TEXT="das setzt sofort rebuilt=True"/>
</node>
<node CREATED="1764120804248" ID="ID_1459693637" MODIFIED="1764120818133" TEXT="Konsequenz: Anfrage steigt mit changed == True sofort aus">
<node CREATED="1764120845642" ID="ID_1158775294" MODIFIED="1764120856327" TEXT="erzeugt aber vorher noch die get_csig()"/>
<node CREATED="1764120934093" ID="ID_1961762133" MODIFIED="1764120952854" TEXT="das stellt leddiglich sicher, da&#xdf; eine csig (content-signature) da ist"/>
</node>
</node>
</node>
<node CREATED="1764162004837" ID="ID_1529143977" MODIFIED="1764162052308" TEXT="Breakpoint in SCons/Script/Main.py Funktion _build_targets() (line 1207)">
<icon BUILTIN="back"/>
</node>
<node CREATED="1764125228597" ID="ID_1614548342" MODIFIED="1764125256393" TEXT="anscheinend wird nach dem Build die node-info auch persistiert (incl. der source node info)"/>
<node CREATED="1764125258571" ID="ID_1065081727" MODIFIED="1764125260157" TEXT="sconsign -e track-unlocked.svg -d data/icons/svg -r">
<node CREATED="1764125262365" ID="ID_803530123" MODIFIED="1764125276579" TEXT="listet den Eintrag aus .sconssign.dblite"/>
<node CREATED="1764125491517" ID="ID_813069188" MODIFIED="1764125496444" TEXT="diese Werte sind stabil"/>
<node COLOR="#338800" CREATED="1764125497222" ID="ID_1325815121" MODIFIED="1764125511176" TEXT="und die Sig ist tats&#xe4;chlich die md5sum">
<icon BUILTIN="button_ok"/>
</node>
</node>
</node>
<node CREATED="1764128507126" ID="ID_1100515931" MODIFIED="1764128512597" TEXT="Zwischenbilanz">
<node BACKGROUND_COLOR="#e0ceaa" COLOR="#690f14" CREATED="1764128513896" ID="ID_1457065500" MODIFIED="1764208361818" STYLE="fork" TEXT="die Logik erscheint mir defekt">
<arrowlink COLOR="#c31078" DESTINATION="ID_1338934186" ENDARROW="Default" ENDINCLINATION="-20;-60;" ID="Arrow_ID_570788323" STARTARROW="None" STARTINCLINATION="42;64;"/>
<font NAME="SansSerif" SIZE="12"/>
<icon BUILTIN="broken-line"/>
<node CREATED="1764128555223" ID="ID_1591482768" MODIFIED="1764128577944" TEXT="es ist korrekt, den Check &#xfc;ber die dependency (=source) zu machen"/>
<node CREATED="1764128676576" ID="ID_1845331114" MODIFIED="1764128695224" TEXT="aber warum schaut man dann in die dependecy-map?">
<node CREATED="1764128710316" ID="ID_1251285042" MODIFIED="1764128723844" TEXT="eine Original-Src hat niemals Dependencies"/>
<node CREATED="1764128814671" ID="ID_700997188" MODIFIED="1764128829342" TEXT="und warum geben wir dann True (=changed) zur&#xfc;ck"/>
</node>
<node CREATED="1764128831686" ID="ID_1399109213" MODIFIED="1764128844183" TEXT="m&#xf6;glicherweise ist bereits der Aufruf des Deciders falsch"/>
<node CREATED="1764128849571" ID="ID_1007722672" MODIFIED="1764128872837" TEXT="aber diese Funktion ist im Devault-Environment sowohl f&#xfc;r source als auch f&#xfc;r target eingetragen"/>
</node>
<node COLOR="#5b280f" CREATED="1764128891325" ID="ID_1338934186" MODIFIED="1764208368483" TEXT="das sieht nach einer grunds&#xe4;tzlichen Fehlkonfiguration aus">
<linktarget COLOR="#c31078" DESTINATION="ID_1338934186" ENDARROW="Default" ENDINCLINATION="-20;-60;" ID="Arrow_ID_570788323" SOURCE="ID_1457065500" STARTARROW="None" STARTINCLINATION="42;64;"/>
<icon BUILTIN="messagebox_warning"/>
<icon BUILTIN="button_cancel"/>
<node CREATED="1764208188007" ID="ID_1230230453" MODIFIED="1764208204311" TEXT="tats&#xe4;chlich ist es ein Fehler im explain()-Aufruf"/>
<node CREATED="1764208205061" ID="ID_1187433069" MODIFIED="1764208315664" TEXT="gepaart mit dem grus&#xe4;tzlichen Problemen dieses Codes">
<richcontent TYPE="NOTE"><html>
<head/>
<body>
<p>
da&#223; er n&#228;mlich wenig systematisch aufgebaut ist, und darauf angewiesen, da&#223; alle Daten korrekt normalisiert sind, und die Aufrufe jeweils richtig erfolgen:
</p>
<ul>
<li>
aufgerufen werden mu&#223; auf der Dependency
</li>
<li>
aber das 'node'-Argument mu&#223; die Node des davon abh&#228;ngigen Targets liefern
</li>
<li>
denn es werden die Dependencies des Targets mit der Build-Information der Source verglichen
</li>
</ul>
</body>
</html></richcontent>
</node>
</node>
<node COLOR="#338800" CREATED="1764208414280" ID="ID_591558394" MODIFIED="1764208452038" TEXT="weitere Feststellung: das Persistieren und Laden der Build-Info selber funktioniert fehlerfrei">
<icon BUILTIN="idea"/>
</node>
<node BACKGROUND_COLOR="#dcdda2" COLOR="#435e98" CREATED="1764128918990" ID="ID_948033347" MODIFIED="1764208175091" TEXT="sollte ein Demo-Beispiel &#xbb;auf der gr&#xfc;nen Wiese&#xab; durchspielen">
<richcontent TYPE="NOTE"><html>
<head/>
<body>
<p>
...um all die Komplexit&#228;t von unserem SCons-Build auszuschalten; also praktisch das beispiel f&#252;r einen Builder mit Emitter aus der Doku nachbauen
</p>
</body>
</html></richcontent>
<icon BUILTIN="yes"/>
<node CREATED="1764162769924" ID="ID_952721772" MODIFIED="1764162787110" TEXT="einfaches Beispiel in Python-Projekt &quot;SConsTest&quot;">
<node CREATED="1764162854632" ID="ID_1434574229" MODIFIED="1764162860375" TEXT="ein SConstruct"/>
<node CREATED="1764162861217" ID="ID_191819966" MODIFIED="1764162870894" TEXT="konstruiere ein default-Environment"/>
<node CREATED="1764162871926" ID="ID_200664957" MODIFIED="1764162885203" TEXT="definiere einen Builder von einem Command-String"/>
</node>
<node CREATED="1764162887047" ID="ID_1793652240" MODIFIED="1764206664279" TEXT="Fall-1 : Command-String">
<arrowlink COLOR="#4e81d4" DESTINATION="ID_1815216981" ENDARROW="Default" ENDINCLINATION="17;-267;" ID="Arrow_ID_807332891" STARTARROW="None" STARTINCLINATION="-17;224;"/>
<node CREATED="1764162894483" ID="ID_207913128" LINK="https://scons.org/doc/4.8.0/HTML/scons-user.html#id1452" MODIFIED="1764162958835" TEXT="Beispiel analog zur Doku">
<richcontent TYPE="NOTE"><html>
<head/>
<body>
<div style="background-color: #eee0b5; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 2px">
<div style="color: #202020; background-color: #eee0b5; font-family: Bitstream Vera Sans Mono; font-size: 9pt; white-space: pre">
<p style="margin-top: 0; margin-right: 0; margin-bottom: 0; margin-left: 0">
<font color="#116f8c"><b>from</b></font><font color="#33361c">&#160;SCons.Environment </font><font color="#116f8c"><b>import</b></font><font color="#33361c">&#160; Environment</font>
</p>
<p style="margin-top: 0; margin-right: 0; margin-bottom: 0; margin-left: 0">
<font color="#116f8c"><b>from</b></font><font color="#33361c">&#160;SCons.Builder </font><font color="#116f8c"><b>import</b></font><font color="#33361c">&#160;Builder</font>
</p>
<p style="margin-top: 0; margin-right: 0; margin-bottom: 0; margin-left: 0">
<font color="#116f8c"><b>from</b></font><font color="#33361c">&#160;SCons.Script </font><font color="#116f8c"><b>import</b></font><font color="#33361c">&#160;<u>Decider</u></font>
</p>
<p style="margin-top: 0; margin-right: 0; margin-bottom: 0; margin-left: 0">
<br />
</p>
<p style="margin-top: 0; margin-right: 0; margin-bottom: 0; margin-left: 0">
<br />
</p>
<p style="margin-top: 0; margin-right: 0; margin-bottom: 0; margin-left: 0">
<font color="#33361c">Decider</font><font color="#000000">(</font><font color="#00aa00"><i>'content-timestamp'</i></font><font color="#000000">)</font>
</p>
<p style="margin-top: 0; margin-right: 0; margin-bottom: 0; margin-left: 0">
<br />
</p>
<p style="margin-top: 0; margin-right: 0; margin-bottom: 0; margin-left: 0">
<font color="#33361c">env </font><font color="#000000">=</font><font color="#33361c">&#160;Environment</font><font color="#000000">()</font>
</p>
<p style="margin-top: 0; margin-right: 0; margin-bottom: 0; margin-left: 0">
<font color="#33361c">bld </font><font color="#000000">=</font><font color="#33361c">&#160;Builder</font><font color="#000000">(</font><font color="#33361c">action</font><font color="#000000">=</font><font color="#00aa00"><i>'(echo -n &quot;FOO `date -<u>Isecond</u>` :&quot;; cat) &lt; $SOURCE &gt; $TARGET'</i></font><font color="#000000">)</font>
</p>
<p style="margin-top: 0; margin-right: 0; margin-bottom: 0; margin-left: 0">
<font color="#33361c">env.Append</font><font color="#000000">(</font><font color="#33361c">BUILDERS</font><font color="#000000">={</font><font color="#00aa00"><i>'Foo'</i></font><font color="#33361c">: bld</font><font color="#000000">})</font>
</p>
<p style="margin-top: 0; margin-right: 0; margin-bottom: 0; margin-left: 0">
<br />
</p>
<p style="margin-top: 0; margin-right: 0; margin-bottom: 0; margin-left: 0">
<br />
</p>
<p style="margin-top: 0; margin-right: 0; margin-bottom: 0; margin-left: 0">
<font color="#33361c">env.Foo</font><font color="#000000">(</font><font color="#00aa00"><i>'file.foo'</i></font><font color="#000000">,</font><font color="#33361c">&#160;</font><font color="#00aa00"><i>'file.input'</i></font><font color="#000000">)</font>
</p>
<p style="margin-top: 0; margin-right: 0; margin-bottom: 0; margin-left: 0">
<font color="#33361c">env.Program</font><font color="#000000">(</font><font color="#00aa00"><i>'hello.c'</i></font><font color="#000000">)</font>
</p>
<p style="margin-top: 0; margin-right: 0; margin-bottom: 0; margin-left: 0">
<br />
</p>
<p style="margin-top: 0; margin-right: 0; margin-bottom: 0; margin-left: 0">
</p>
</div>
</div>
</body>
</html></richcontent>
</node>
<node CREATED="1764162971349" ID="ID_1180770235" MODIFIED="1764162977180" TEXT="normaler C-Build dazu"/>
<node CREATED="1764162977914" ID="ID_1403222674" MODIFIED="1764162997228" TEXT="setze globalen Decider(&apos;content-timestamp&apos;)"/>
<node COLOR="#338800" CREATED="1764163009516" ID="ID_684044440" MODIFIED="1764163021645" TEXT="verh&#xe4;lt sich korrekt wie erwartet">
<icon BUILTIN="button_ok"/>
</node>
<node CREATED="1764163038284" ID="ID_1150646608" MODIFIED="1764163046225" TEXT="Untersuchung(Debugger)">
<node CREATED="1764163049956" ID="ID_1876457275" MODIFIED="1764163075705" TEXT="Breakpoint in Node.changed()">
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</node>
<node CREATED="1764163137511" ID="ID_544296417" MODIFIED="1764163627652" TEXT="analoger Callpfad &#x27f6; changed_timestamp_then_content">
<arrowlink DESTINATION="ID_1249854960" ENDARROW="Default" ENDINCLINATION="829;61;" ID="Arrow_ID_251631713" STARTARROW="None" STARTINCLINATION="219;-9;"/>
<linktarget COLOR="#a9b4c1" DESTINATION="ID_544296417" ENDARROW="Default" ENDINCLINATION="290;15;" ID="Arrow_ID_1277649333" SOURCE="ID_1249675555" STARTARROW="None" STARTINCLINATION="-133;19;"/>
</node>
<node CREATED="1764163225797" ID="ID_461453353" MODIFIED="1764163243537" TEXT="Aber: Parameter node=file.foo (das Target)">
<node CREATED="1764163374249" ID="ID_180813430" MODIFIED="1764163381459" TEXT="zun&#xe4;chst plausibel"/>
<node CREATED="1764163382424" ID="ID_1021099649" MODIFIED="1764163388979" TEXT="Check geht erst mal vom Target aus"/>
<node CREATED="1764163421387" ID="ID_1076321235" MODIFIED="1764165795032" TEXT="Taskmaster/__init__.py Funktion make_ready_current()">
<icon BUILTIN="back"/>
<node CREATED="1764163464623" ID="ID_1242338526" MODIFIED="1764163469428" TEXT="for t in self.targets"/>
<node CREATED="1764163479356" ID="ID_582435256" MODIFIED="1764163485416" TEXT="t.is_up_to_date">
<node CREATED="1764163520016" ID="ID_1128757466" MODIFIED="1764163556156" TEXT="self.exists()"/>
<node CREATED="1764163528199" ID="ID_1586284360" MODIFIED="1764163542743" TEXT="and"/>
<node CREATED="1764163543566" ID="ID_1249675555" MODIFIED="1764163627652" TEXT="not self.changed()">
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</node>
</node>
</node>
</node>
<node CREATED="1764163761213" ID="ID_659618360" MODIFIED="1764163789384" TEXT="damit ist die dependecy_map nicht leer">
<richcontent TYPE="NOTE"><html>
<head/>
<body>
<p>
sondern enth&#228;lt genau einen Eintrag, n&#228;mlich die SOURCE
</p>
</body>
</html></richcontent>
</node>
<node CREATED="1764166082280" ID="ID_1318166556" MODIFIED="1764166089822" TEXT="Feststellung Unterschied">
<node CREATED="1764166091380" ID="ID_1611703480" MODIFIED="1764166109958" TEXT="in diesem Aufruf wird f&#xfc;r alle Targets gepr&#xfc;ft, ob sie ge&#xe4;ndert sind"/>
<node CREATED="1764166111025" ID="ID_1438494767" MODIFIED="1764166128394" TEXT="damit erfolgt der Aufruf Node.changed auf der Target-Node"/>
<node CREATED="1764166131401" ID="ID_610545269" MODIFIED="1764166148914" TEXT="diese ruft ebenfalls die Pr&#xfc;ffunktion auf der Source-Node auf"/>
<node CREATED="1764166149693" ID="ID_1404022334" MODIFIED="1764166162015" TEXT="ABER sie &#xfc;bergibt die Target-Node als Parameter &apos;node&apos;"/>
<node CREATED="1764166163139" ID="ID_1676404223" MODIFIED="1764166212481" TEXT="&#x27f9; es wird die dependency_map vom Target mit der Node-Info der SOURCE abgeglichen"/>
<node CREATED="1764166213358" ID="ID_299575861" MODIFIED="1764166233343" TEXT="beides enth&#xe4;lt die gleiche Info &#x27f9; gilt als NICHT GE&#xc4;NDERT"/>
</node>
<node CREATED="1764167256353" ID="ID_507250618" MODIFIED="1764167281208" TEXT="vergleiche mit Situation in Lumiera(Debugger)">
<node CREATED="1764167282246" ID="ID_581814259" LINK="#ID_637424717" MODIFIED="1764167332616" TEXT="Breakpoint auf dem Decider changed_timestamp_then_content()"/>
<node CREATED="1764167295513" ID="ID_1734994444" MODIFIED="1764167307844" TEXT="mit Condition: str(target) == &apos;target/gui/icons/22x22/track-unlocked.png&apos;">
<icon BUILTIN="idea"/>
</node>
<node CREATED="1764167531276" ID="ID_32450596" MODIFIED="1764167550254" TEXT="Trigger -&gt; target.changed()">
<node CREATED="1764167578662" ID="ID_1502874296" MODIFIED="1764167591881" TEXT="Aufruf nun mit node = target gesetzt"/>
<node COLOR="#338800" CREATED="1764167878749" ID="ID_1115961542" MODIFIED="1764167887189" TEXT="funktioniert genauso korrekt">
<icon BUILTIN="button_ok"/>
</node>
</node>
<node CREATED="1764167927218" ID="ID_815837870" MODIFIED="1764167951771" TEXT="aber direkt danach: Mismatch auf die ActSig">
<richcontent TYPE="NOTE"><html>
<head/>
<body>
<p>
Die Action ist hier ein Python-Objekt
</p>
</body>
</html></richcontent>
</node>
<node BACKGROUND_COLOR="#fafe99" COLOR="#fa002a" CREATED="1764168766467" ID="ID_254425297" MODIFIED="1764168783762" TEXT="der Aufruf aus explain() ist unvollst&#xe4;ndig parametrisiert">
<icon BUILTIN="broken-line"/>
<node CREATED="1764168785830" ID="ID_1336095597" MODIFIED="1764168794731" TEXT="das hat mich gestern in die Irre geleitet"/>
<node CREATED="1764168795535" ID="ID_1615193335" MODIFIED="1764168807439" TEXT="der bekommt keinen &apos;node&apos;- Parameter mit"/>
<node CREATED="1764168820270" ID="ID_1145600715" MODIFIED="1764168898774" TEXT="dagegen der Target-Check macht Node.changed()">
<richcontent TYPE="NOTE"><html>
<head/>
<body>
<p>
...und hier wird self (=die Target-Node) als 4.Parameter mitgegeben, die Pr&#252;fung erfolgt auf dem child, also der Source-Node
</p>
</body>
</html></richcontent>
</node>
<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1764169462470" ID="ID_227063285" MODIFIED="1764169495485" TEXT="wenn man den offensichtlichen Fix machen w&#xfc;rde">
<icon BUILTIN="idea"/>
<node CREATED="1764169501214" ID="ID_1563571172" MODIFIED="1764169531671" TEXT="also &apos;self&apos; als 4.Parameter in explain() mitgeben">
<richcontent TYPE="NOTE"><html>
<head/>
<body>
<p>
was korrekt wit, da auch explain() auf der Source-Node aufgerufen wird
</p>
</body>
</html></richcontent>
</node>
<node CREATED="1764169533938" ID="ID_1705447477" MODIFIED="1764169581096" TEXT="dann w&#xe4;re die Diagnostik korrekt">
<richcontent TYPE="NOTE"><html>
<head/>
<body>
<p>
scons: rebuilding `target/gui/icons/24x24/track-unlocked.png' because the contents of the build action changed
</p>
</body>
</html></richcontent>
</node>
</node>
</node>
</node>
</node>
</node>
</node>
</node>
<node BACKGROUND_COLOR="#e6bf8e" COLOR="#690f14" CREATED="1764170705683" ID="ID_1229473469" MODIFIED="1764208128038" TEXT="Problem identifiziert: Signatur der Builder-Aktion ist nicht stabil">
<icon BUILTIN="broken-line"/>
<node BACKGROUND_COLOR="#accdc3" COLOR="#3f4015" CREATED="1764170726054" ID="ID_1680240676" MODIFIED="1764208039498" STYLE="fork" TEXT="SO.ai nach L&#xf6;sung gefragt">
<richcontent TYPE="NOTE"><html>
<head/>
<body>
<h3 http-equiv="content-type" content="text/html; charset=utf-8">
Short answer
</h3>
<p>
Make the Action expose a <strong>stable, deterministic signature</strong>&#160;by providing an explicit <strong>string function</strong>&#160;(<code>strfunction</code>) and/or an explicit <strong>variable list</strong>&#160;(<code>varlist</code>) when creating the Action, and avoid putting non-deterministic values (timestamps, randoms, VM-specific paths) into that signature.
</p>
<h3>
Why
</h3>
<p>
SCons decides whether to rebuild partly from the Action's <em>signature</em>&#160; (a string representing the action) and from node signatures. A Python Action built without an explicit <code>strfunction</code>&#160;can produce unstable or overly-broad signatures and cause unnecessary rebuilds.
</p>
<h3>
How (concise example)
</h3>
<ul>
<li>
Import SCons Action and make the Python function do the work.
</li>
<li>
Provide an explicit <code>strfunction</code>&#160;that returns a deterministic string (or a short label).
</li>
<li>
Optionally provide <code>varlist</code>&#160;to include relevant environment variables in the signature.
</li>
</ul>
<p>
Example:
</p>
<pre class="hljs s-code-block" code-as-text="from SCons.Action import Action
def my_build(target, source, env):
# do deterministic build steps
with open(str(target[0]), " wb="#DEFAULT" as="#DEFAULT" out="#DEFAULT" out.write="#DEFAULT" open="#DEFAULT" str="#DEFAULT" source="#DEFAULT" rb="rb" read="#DEFAULT" return="#DEFAULT" none="#DEFAULT" deterministic="#DEFAULT" signature="#DEFAULT" string="#DEFAULT" keep="#DEFAULT" it="#DEFAULT" short="#DEFAULT" and="#DEFAULT" stable="#DEFAULT" def="#DEFAULT" my_strfunc="#DEFAULT" act="#DEFAULT" target="#DEFAULT" env="#DEFAULT" my_build="my_build" s="#DEFAULT" join="#DEFAULT" s.path="#DEFAULT" for="#DEFAULT" in="#DEFAULT" t.path="#DEFAULT" t="#DEFAULT" optionally="#DEFAULT" include="#DEFAULT" variables="#DEFAULT" that="#DEFAULT" should="#DEFAULT" affect="#DEFAULT" rebuilds="#DEFAULT" my_action="#DEFAULT" varlist="[MYFLAG," other_var="#DEFAULT" env.command="#DEFAULT" out.bin="#DEFAULT" in.bin="#DEFAULT"></pre>
<div class="d-flex h32">
<p class="fc-light langugage-python flex-item w90 fs-body1">
python
</p>
</div>
<pre class="hljs s-code-block" code-as-text="from SCons.Action import Action
def my_build(target, source, env):
# do deterministic build steps
with open(str(target[0]), " wb="#DEFAULT" as="#DEFAULT" out="#DEFAULT" out.write="#DEFAULT" open="#DEFAULT" str="#DEFAULT" source="#DEFAULT" rb="rb" read="#DEFAULT" return="#DEFAULT" none="#DEFAULT" deterministic="#DEFAULT" signature="#DEFAULT" string="#DEFAULT" keep="#DEFAULT" it="#DEFAULT" short="#DEFAULT" and="#DEFAULT" stable="#DEFAULT" def="#DEFAULT" my_strfunc="#DEFAULT" act="#DEFAULT" target="#DEFAULT" env="#DEFAULT" my_build="my_build" s="#DEFAULT" join="#DEFAULT" s.path="#DEFAULT" for="#DEFAULT" in="#DEFAULT" t.path="#DEFAULT" t="#DEFAULT" optionally="#DEFAULT" include="#DEFAULT" variables="#DEFAULT" that="#DEFAULT" should="#DEFAULT" affect="#DEFAULT" rebuilds="#DEFAULT" my_action="#DEFAULT" varlist="[MYFLAG," other_var="#DEFAULT" env.command="#DEFAULT" out.bin="#DEFAULT" in.bin="#DEFAULT"><code>from SCons.Action import Action
def my_build(target, source, env):
# do deterministic build steps
with open(str(target[0]), &quot;wb&quot;) as out:
out.write(open(str(source[0]), &quot;rb&quot;).read())
return None
# deterministic signature string; keep it short and stable
def my_strfunc(act, target, source, env):
return &quot;my_build: %s -&gt; %s&quot; % (&quot;,&quot;.join([s.path for s in source]), &quot;,&quot;.join([t.path for t in target]))
# optionally include env variables that should affect rebuilds
my_action = Action(my_build, my_strfunc, varlist=['MYFLAG', 'OTHER_VAR'])
env.Command('out.bin', 'in.bin', my_action)</code></pre>
<h3>
Practical rules
</h3>
<ul>
<li>
<strong>Provide <code>strfunction</code></strong>&#160;(or <code>cmdstr</code>) so the action signature is explicit and stable.
</li>
<li>
<strong>Use <code>varlist</code></strong>&#160;to include only environment variables that legitimately change build output.
</li>
<li>
<strong>Avoid</strong>&#160;including timestamps, absolute temp paths, random values, or local-only data in the signature.
</li>
<li>
Prefer content-based decider (SCons default) for file changes; only make action signature sensitive to what truly affects outputs.
</li>
</ul>
<h3>
Tips &amp; Alternatives
</h3>
<ul>
<li>
To debug why SCons rebuilds, run SCons with <code>--debug=explain</code>&#160;to see which signature or node change triggered the rebuild.
</li>
<li>
If you need fully content-driven rebuilds, ensure the decider is set appropriately and rely on file content signatures rather than variable-heavy action signatures.
</li>
</ul>
</body>
</html></richcontent>
<edge COLOR="#808080" STYLE="bezier" WIDTH="thin"/>
<icon BUILTIN="wizard"/>
<icon BUILTIN="button_cancel"/>
<node CREATED="1764208045145" ID="ID_542150981" MODIFIED="1764208053745" TEXT="diese Antwort klingt plausibel"/>
<node CREATED="1764208066800" ID="ID_377532987" MODIFIED="1764208081349">
<richcontent TYPE="NODE"><html>
<head/>
<body>
<p>
aber ist komplett <b>falsch und irref&#252;hrend</b>
</p>
</body>
</html></richcontent>
</node>
<node BACKGROUND_COLOR="#e0ceaa" COLOR="#690f14" CREATED="1764208083484" ID="ID_991502681" MODIFIED="1764208573875" TEXT="die String-Repr&#xe4;sentation wird nicht f&#xfc;r die Signatur verwendet">
<linktarget COLOR="#d93175" DESTINATION="ID_991502681" ENDARROW="Default" ENDINCLINATION="-1062;46;" ID="Arrow_ID_1837446907" SOURCE="ID_1904887062" STARTARROW="None" STARTINCLINATION="-347;16;"/>
<icon BUILTIN="messagebox_warning"/>
</node>
</node>
<node CREATED="1764190327183" ID="ID_1063444485" MODIFIED="1764190337199" TEXT="nicht so klar wie die AI meint....">
<node CREATED="1764190338591" ID="ID_104855868" MODIFIED="1764190346266" TEXT="denn wir &#xfc;bergeben einen cmdstr."/>
<node CREATED="1764190348639" ID="ID_923448890" MODIFIED="1764207898908" TEXT="Konstruktur Action (SCons/Action.py 513)">
<linktarget COLOR="#597d8e" DESTINATION="ID_923448890" ENDARROW="Default" ENDINCLINATION="76;-515;" ID="Arrow_ID_657949434" SOURCE="ID_881837314" STARTARROW="None" STARTINCLINATION="1190;40;"/>
<node CREATED="1764190409731" ID="ID_1922185391" MODIFIED="1764190434282" TEXT="geht in _do_create_action() (Z.475)"/>
<node CREATED="1764190463162" ID="ID_775727694" MODIFIED="1764190474895" TEXT="versucht erst ein Action-Obejekt"/>
<node CREATED="1764190489751" ID="ID_729736838" MODIFIED="1764190546980" TEXT="falls callable(object) &#x27f6; konstruiert FunctionAction (Action.py 1370)"/>
<node CREATED="1764190558724" ID="ID_61269931" MODIFIED="1764190572622" TEXT="das erzeugt die &#xbb;function_contents&#xab; f&#xfc;r die Signatur">
<node CREATED="1764190641253" ID="ID_790821654" MODIFIED="1764190664780" TEXT="versucht erst _callable_contens() (line 165)"/>
<node CREATED="1764190671807" ID="ID_1169106586" MODIFIED="1764190697955" TEXT="und ist dann erfolgreich bei _code_contents() (251)"/>
<node CREATED="1764190699186" ID="ID_934978881" MODIFIED="1764190712411" TEXT="das liefert das Byte-Array, das nicht stabil ist"/>
</node>
</node>
</node>
<node CREATED="1764190893532" ID="ID_1248473027" MODIFIED="1764190905842" TEXT="Also: Experiment fortsetzen">
<node CREATED="1764193427492" ID="ID_1815216981" MODIFIED="1764206652140" TEXT="Schritt-1: Python-Funktion">
<linktarget COLOR="#4e81d4" DESTINATION="ID_1815216981" ENDARROW="Default" ENDINCLINATION="17;-267;" ID="Arrow_ID_807332891" SOURCE="ID_1793652240" STARTARROW="None" STARTINCLINATION="-17;224;"/>
<node CREATED="1764193437611" ID="ID_1307270771" MODIFIED="1764193442404" TEXT="tja..."/>
<node CREATED="1764193443017" ID="ID_1498615791" MODIFIED="1764193493199" TEXT="jetzt geht er nicht in die _code_contents sondern die _function_contents">
<node CREATED="1764194018116" ID="ID_753049596" MODIFIED="1764194032803" TEXT="und zwar weil hier {code.co_argcount}, {len(code.co_varnames)} einen AttibuteError ausl&#xf6;st"/>
</node>
<node CREATED="1764193498770" ID="ID_1400585883" MODIFIED="1764196440335" TEXT="und diese liefern in dem Setup hier wohl eine stabile Signatur"/>
<node CREATED="1764193517390" ID="ID_1326768869" MODIFIED="1764193632669" TEXT="Grr.... dynamische Sprachen">
<richcontent TYPE="NOTE"><html>
<head/>
<body>
<p>
Mu&#223; schon sagen, nach einiger Zeit Debugging bin ich schon wieder am Kotzen. Dieser Stil!!!!
</p>
<p>
Man akzeptiert irgendwas und geht dann durch eine zigfach verschachtelte Kette von Adaptern, solange bis es irgendwann.... wenn ... dann ... eben doch irgendwie pa&#223;t
</p>
</body>
</html></richcontent>
<icon BUILTIN="smiley-angry"/>
</node>
<node CREATED="1764193651944" ID="ID_116095103" MODIFIED="1764193663740" TEXT="in meinem Lumiera-Fall habe ich eine innere Funktion &#xfc;bergeben"/>
</node>
</node>
<node COLOR="#5b280f" CREATED="1764196448194" ID="ID_233655533" MODIFIED="1764196477064" TEXT="STOP ... einen Schritt zur&#xfc;ck!">
<icon BUILTIN="stop-sign"/>
<node CREATED="1764196513871" ID="ID_126115733" MODIFIED="1764196525174" TEXT="auch die _function_contents greifen auf die _code_contents zur&#xfc;ck"/>
<node BACKGROUND_COLOR="#e0ceaa" COLOR="#690f14" CREATED="1764196525947" ID="ID_1567314752" MODIFIED="1764196542870" TEXT="ich kann nicht sagen warum die Signatur nicht stabil ist">
<icon BUILTIN="messagebox_warning"/>
<node BACKGROUND_COLOR="#fafe99" COLOR="#fa002a" CREATED="1764196749412" FOLDED="true" ID="ID_1471993413" MODIFIED="1764198031733" TEXT="mehrere Aufrufe">
<icon BUILTIN="edit"/>
<node CREATED="1764196755951" ID="ID_1421392732" MODIFIED="1764197458583" TEXT="bytearray: bytearray(b&quot;3, 4, 0, 1,({int:builtins}[[[(&lt;class \&apos;object\&apos;&gt;, ()), [(&lt;class \&apos;int\&apos;&gt;, (&lt;class \&apos;object\&apos;&gt;,))]]]]{{}}{{{denominator=1,imag=0,numerator=0,real=0}}},#),(str,subst,path,buildIcon,removeprefix,main),(&gt;\x01\x95\x00[\x01\x00\x00\x00\x00\x00\x00\x00\x00U\x01S\x01\x05\x00\x00\x005\x01\x00\x00\x00\x00\x00\x00n\x01U\x02R\x03\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00U\x02R\x04\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00R\x06\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x005\x01\x00\x00\x00\x00\x00\x00R\t\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00S\x025\x01\x00\x00\x00\x00\x00\x00n\x03T\x04R\x0b\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00X\x13/\x025\x01\x00\x00\x00\x00\x00\x00 \x00g\x01),(),({module:builtins}[[[(&lt;class \&apos;object\&apos;&gt;, ()), [(&lt;class \&apos;module\&apos;&gt;, (&lt;class \&apos;object\&apos;&gt;,))]]]]{{}}{{{artworkLayerPrefix=artwork:,copyMergeDirectory=&lt;function copyMergeDirectory at 0x7f0eeb296ac0&gt;,createDirectory=&lt;function createDirectory at 0x7f0eeb296200&gt;,findChildLayerElement=&lt;function findChildLayerElement at 0x7f0eeb14ff60&gt;,getDocumentSize=&lt;function getDocumentSize at 0x7f0eeb14fec0&gt;,getTargetNames=&lt;function getTargetNames at 0x7f0eeb15c2c0&gt;,getopt=&lt;module \&apos;getopt\&apos; from \&apos;/usr/lib/python3.13/getopt.py\&apos;&gt;,main=&lt;function main at 0x7f0eeb15c4a0&gt;,minidom=&lt;module \&apos;xml.dom.minidom\&apos; from \&apos;/usr/lib/python3.13/xml/dom/minidom.py\&apos;&gt;,os=&lt;module \&apos;os\&apos; (frozen)&gt;,parseArguments=&lt;function parseArguments at 0x7f0eeb15c400&gt;,parseP..."/>
<node CREATED="1764197669549" ID="ID_856521642" MODIFIED="1764197794611" TEXT="bytearray: bytearray(b&quot;3, 4, 0, 1,({int:builtins}[[[(&lt;class \&apos;object\&apos;&gt;, ()), [(&lt;class \&apos;int\&apos;&gt;, (&lt;class \&apos;object\&apos;&gt;,))]]]]{{}}{{{denominator=1,imag=0,numerator=0,real=0}}},#),(str,subst,path,buildIcon,removeprefix,main),(&gt;\x01\x95\x00[\x01\x00\x00\x00\x00\x00\x00\x00\x00U\x01S\x01\x05\x00\x00\x005\x01\x00\x00\x00\x00\x00\x00n\x01U\x02R\x03\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00U\x02R\x04\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00R\x06\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x005\x01\x00\x00\x00\x00\x00\x00R\t\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00S\x025\x01\x00\x00\x00\x00\x00\x00n\x03T\x04R\x0b\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00X\x13/\x025\x01\x00\x00\x00\x00\x00\x00 \x00g\x01),(),({module:builtins}[[[(&lt;class \&apos;object\&apos;&gt;, ()), [(&lt;class \&apos;module\&apos;&gt;, (&lt;class \&apos;object\&apos;&gt;,))]]]]{{}}{{{artworkLayerPrefix=artwork:,copyMergeDirectory=&lt;function copyMergeDirectory at 0x7f5e85912ac0&gt;,createDirectory=&lt;function createDirectory at 0x7f5e85912200&gt;,findChildLayerElement=&lt;function findChildLayerElement at 0x7f5e857cbf60&gt;,getDocumentSize=&lt;function getDocumentSize at 0x7f5e857cbec0&gt;,getTargetNames=&lt;function getTargetNames at 0x7f5e857d82c0&gt;,getopt=&lt;module \&apos;getopt\&apos; from \&apos;/usr/lib/python3.13/getopt.py\&apos;&gt;,main=&lt;function main at 0x7f5e857d84a0&gt;,minidom=&lt;module \&apos;xml.dom.minidom\&apos; from \&apos;/usr/lib/python3.13/xml/dom/minidom.py\&apos;&gt;,os=&lt;module \&apos;os\&apos; (frozen)&gt;,parseArguments=&lt;function parseArguments at 0x7f5e857d8400&gt;,parseP..."/>
</node>
<node BACKGROUND_COLOR="#e0ceaa" COLOR="#690f14" CREATED="1764197821601" ID="ID_179523558" MODIFIED="1764197846225" TEXT="Problem identifiziert">
<icon BUILTIN="back"/>
<node CREATED="1764197847709" ID="ID_196667894" MODIFIED="1764198047583">
<richcontent TYPE="NODE"><html>
<head/>
<body>
<p>
die Builder-Funktion in Lumiera ruft ein <b>externes Python-Modul</b>&#160;auf
</p>
</body>
</html></richcontent>
</node>
<node CREATED="1764197874850" ID="ID_183571418" MODIFIED="1764197903532" TEXT="die Signatur-Repr&#xe4;sentation hiervon enth&#xe4;lt konkrete Speicheradressen">
<node CREATED="1764197939061" ID="ID_748961006" MODIFIED="1764197972163">
<richcontent TYPE="NODE"><html>
<head/>
<body>
<p>
copyMergeDirectory=&lt;function copyMergeDirectory at <font color="#cd0d0d">0x7f0eeb296ac0</font>&gt;
</p>
</body>
</html></richcontent>
</node>
<node CREATED="1764197954229" ID="ID_534450202" MODIFIED="1764197987943">
<richcontent TYPE="NODE"><html>
<head/>
<body>
<p>
copyMergeDirectory=&lt;function copyMergeDirectory at <font color="#bc0296">0x7f5e85912ac0</font>&gt;
</p>
</body>
</html></richcontent>
</node>
</node>
</node>
</node>
<node BACKGROUND_COLOR="#c8c0b6" COLOR="#435e98" CREATED="1764198282075" ID="ID_634208700" MODIFIED="1764206575310" TEXT="ein Zugang damit wir selbst den Signatur-Content liefern k&#xf6;nnen">
<icon BUILTIN="yes"/>
<node CREATED="1764198351950" ID="ID_145196228" MODIFIED="1764198364229" TEXT="SCons/Action.py lesen">
<icon BUILTIN="idea"/>
</node>
<node CREATED="1764198661099" ID="ID_1034033888" MODIFIED="1764206681267" TEXT="Ansatz: selber get_contents() implementieren, oder get_presig()">
<icon BUILTIN="back"/>
<node CREATED="1764199221763" ID="ID_173106382" MODIFIED="1764199230578" TEXT="class FunctionAction">
<node CREATED="1764199235906" ID="ID_1139807284" MODIFIED="1764199242327" TEXT="definiert eine get_presig"/>
<node CREATED="1764199243443" ID="ID_1954947952" MODIFIED="1764199414739" TEXT="diese ruft eine Methode gc(target, source, env) auf, die nirgends definiert ist">
<richcontent TYPE="NOTE"><html>
<head/>
<body>
<p>
r-grep &#252;ber das ganze SCons-Paket gemacht....
</p>
<p>
Die Klasse erbt von der 'ABC' - Basisklasse (Python-3-Konstrukt). Aber die Argumente von gc(...) sprechen eigentlich daf&#252;r, da&#223; das zu SCons geh&#246;rt
</p>
</body>
</html></richcontent>
</node>
<node CREATED="1764199271397" ID="ID_509844765" MODIFIED="1764199288220" TEXT="und f&#xe4;llt ansonsten auf die funccontents zur&#xfc;ck"/>
<node CREATED="1764199422641" ID="ID_834794941" MODIFIED="1764199436944" TEXT="in get_contents() wird das in ein byte[] gepackt"/>
<node CREATED="1764199495026" ID="ID_574609637" MODIFIED="1764199773960" TEXT="h&#xe4;ngt dann die Varlist nochmal drann ... so zur Sicherheit">
<richcontent TYPE="NOTE"><html>
<head/>
<body>
<p>
Diese Mentalit&#228;t der Leute macht mich w&#252;tend.
</p>
<p>
Kann man mal sein Hirn einschalten, bevor man loshackt??
</p>
<p>
Wenn jemand eine eigene Implementierung liefert, dann hat er Gr&#252;nde daf&#252;r und man kann erwarten, da&#223; dann auch der Kontrakt erf&#252;llt wird. Woher wollen die denn wissen, ob eine custom-Implementierung &#252;berhaupteine &#187;Varlist&#171; eingeschlossen haben m&#246;chte???!!&#160;&#160;Zumal die ABC (ActionBase) <b>gar kein Attribut 'self.varilist' hat</b>... das kommt erst im n&#228;chsten Layer dazu.
</p>
</body>
</html></richcontent>
<icon BUILTIN="smiley-angry"/>
</node>
</node>
<node COLOR="#435e98" CREATED="1764200774688" ID="ID_1413156316" MODIFIED="1764206588583" TEXT="Kl&#xe4;ren: was mu&#xdf; in die Signatur">
<icon BUILTIN="yes"/>
<node CREATED="1764201862994" ID="ID_1140009735" MODIFIED="1764201880707" TEXT="Idealerweise: etwas was die Code-Identit&#xe4;t sicherstellt"/>
<node CREATED="1764201979874" ID="ID_101268480" MODIFIED="1764202003864" TEXT="wir k&#xf6;nnen hier defensiv sein....">
<richcontent TYPE="NOTE"><html>
<head/>
<body>
<p>
es teht ja nur darum, re-Builds der Icons zu vermeiden
</p>
</body>
</html></richcontent>
</node>
<node CREATED="1764202005107" ID="ID_918310175" MODIFIED="1764202018937" TEXT="Ha! SCons selber kann das doch....">
<icon BUILTIN="idea"/>
<node CREATED="1764202024797" ID="ID_1499460505" MODIFIED="1764202033279" TEXT="SCons.Node.get_csig()"/>
<node CREATED="1764202035197" ID="ID_459783361" MODIFIED="1764202045557" TEXT="und von den Modulen das __file__"/>
<node CREATED="1764202062633" ID="ID_65638174" MODIFIED="1764202064823" TEXT="und zwar">
<node CREATED="1764202065752" ID="ID_516672702" MODIFIED="1764202073585" TEXT="LumieraEnvironment"/>
<node CREATED="1764202074452" ID="ID_817485828" MODIFIED="1764202091154" TEXT="IconSvgRenderer"/>
</node>
</node>
<node CREATED="1764206600802" ID="ID_1253894675" MODIFIED="1764206605687" TEXT="gef&#xe4;llt mir ...."/>
</node>
</node>
</node>
</node>
</node>
</node>
<node COLOR="#338800" CREATED="1764206692592" ID="ID_1555995629" MODIFIED="1764206698412" TEXT="Problem gel&#xf6;st">
<icon BUILTIN="button_ok"/>
<node CREATED="1764206700116" ID="ID_80156061" MODIFIED="1764206712491" TEXT="wir definieren eine eigene Action-Klasse"/>
<node CREATED="1764206713359" ID="ID_1664434620" MODIFIED="1764207518645" TEXT="diese erbt von SCons/Action &gt; FunctionAction"/>
<node CREATED="1764206723978" ID="ID_1008781270" MODIFIED="1764207686767" TEXT="und &#xfc;berlagert nur die Signatur-Methode">
<richcontent TYPE="NOTE"><html>
<head/>
<body>
<p>
...die Standard-Implementierung dieser get_contents()-Methode vewendet ein Rendering der involvierten Code-Objekte, inklusive der Variablen. Hier w&#252;rde der IconSvgRenderer auftauchen. Stattdessen setzen wir eine Pr&#252;fsumme auf den Python-Quellcode; das Executable rsvog-convert ist sowiso auch noch eine Dependency, und auch &#196;nderungen daran w&#252;rden erkannt. Und nat&#252;rlich &#196;nderungen am SVG-Quellcode.
</p>
</body>
</html></richcontent>
</node>
<node CREATED="1764206733293" ID="ID_508800749" MODIFIED="1764206776930" TEXT="die Signatur wird statisch generiert aus dem Python-Quellcode">
<richcontent TYPE="NOTE"><html>
<head/>
<body>
<p>
...und das lassen wir SCons machen, das kann das ja sehr gut...
</p>
</body>
</html></richcontent>
</node>
<node COLOR="#435e98" CREATED="1764208598028" ID="ID_1675714808" MODIFIED="1764208748756" TEXT="Fazit">
<font BOLD="true" NAME="SansSerif" SIZE="12"/>
<node BACKGROUND_COLOR="#d7b2ce" COLOR="#fa002a" CREATED="1764208601891" ID="ID_1165477361" MODIFIED="1764208648491" TEXT="die AI hat mich komplett auf die falsche F&#xe4;hrte gesetzt">
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</node>
<node CREATED="1764208652852" ID="ID_772119116" MODIFIED="1764208670272" TEXT="war aber trotzdem hilfreich, weil ich damit den Einstieg in das Thema gefunden habe"/>
<node CREATED="1764208671046" ID="ID_410008539" MODIFIED="1764208678702" TEXT="was wirklich geholfen hat....">
<node CREATED="1764208679605" ID="ID_249393708" MODIFIED="1764208686390" TEXT="das SCons-User-Manual lesen!"/>
<node CREATED="1764208687186" ID="ID_26827256" MODIFIED="1764208692749" TEXT="die SCons-Manpage lesen"/>
<node CREATED="1764208693722" ID="ID_1544929700" MODIFIED="1764208704149" TEXT="den Quellcode mit Debugger in Aktion beobachten"/>
</node>
<node BACKGROUND_COLOR="#e0ceaa" COLOR="#690f14" CREATED="1764208720161" ID="ID_1688037035" MODIFIED="1764208828214" TEXT="und: wirklich gut ist der SCons-Quellcode nicht">
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<node CREATED="1764208751388" ID="ID_1273413564" MODIFIED="1764208757054" TEXT="die Konzepte sind gut"/>
<node CREATED="1764208757962" ID="ID_1945267141" MODIFIED="1764208772637" TEXT="die Implementierung versucht per &#xbb;duck-typing&#xab; zu normalisieren"/>
<node CREATED="1764208774007" ID="ID_166116148" MODIFIED="1764208786092" TEXT="letztlich ist das alles schon konsistent"/>
<node CREATED="1764208786877" ID="ID_1237671551" MODIFIED="1764208805285" TEXT="macht aber trotz allem sehr viel Pr&#xfc;fungen"/>
<node CREATED="1764208806162" ID="ID_1765397466" MODIFIED="1764208821103" TEXT="und baut eine irre gro&#xdf;e und tief vernetzte Datenstruktur auf"/>
</node>
</node>
</node>
</node>
<node BACKGROUND_COLOR="#d2beaf" COLOR="#5c4d6e" CREATED="1763560137355" ID="ID_1362355060" MODIFIED="1763560152772" TEXT="bekannte Probleme">
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<icon BUILTIN="licq"/>