Bug 1807535

Summary:	qt5-qtwebkit requires Python 2 to build
Product:	[Fedora] Fedora	Reporter:	Petr Viktorin (pviktori) <pviktori>
Component:	qt5-qtwebkit	Assignee:	Rex Dieter <rdieter>
Status:	CLOSED RAWHIDE	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	rawhide	CC:	jgrulich, jreznik, kamikazow, kde-sig, rdieter, than
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Hardware:	Unspecified
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Last Closed:	2020-04-24 16:17:04 UTC	Type:	Bug
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
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Bug Depends On:
Bug Blocks:	1803205

Description Petr Viktorin (pviktori) 2020-02-26 15:08:31 UTC

Python 2 reached upstream end-of-life in January 2020. In Fedora Rawhide, it's now provided from the compat package `python27`.
Packages that only use Python 2 at build time, like qt5-qtwebkit, had a general exception to keep using it in Fedora 31. Now, the dependency should be removed.
Let us know if you need any help investigating or removing the dependency. (There are dozens of packages like this, so we didn't investigate this one thoroughly. We assume you know the package best.)

If it's possible that the dependency won't be removed in Fedora 33. Please request a FESCo exception. You can refer to the exception for mercurial as an example: https://pagure.io/fesco/issue/2243
It's good to mention:

- What is the reason for the Python 2 build dependency?

- What are the upstream/community plans/timelines regarding Python 2?

- What is the guidance for porting the build to Python 3? (Assuming that there is someone who generally knows how to port to Python 3, but doesn't know anything about the particular package, what are the next steps to take?)

If you need anything from us, or something is unclear, please mention it here.

Comment 1 Rex Dieter 2020-02-27 14:38:40 UTC

Naively attempting to use python3 fails,

[  4%] Generating ../../DerivedSources/JavaScriptCore/Bytecodes.h, ../../DerivedSources/JavaScriptCore/InitBytecodes.asm
cd /builddir/build/BUILD/qtwebkit-5.212.0-alpha3/Source/JavaScriptCore && /usr/bin/python /builddir/build/BUILD/qtwebkit-5.212.0-alpha3/Source/JavaScriptCore/generate-bytecode-files --bytecodes_h /builddir/build/BUILD/qtwebkit-5.212.0-alpha3/DerivedSources/JavaScriptCore/Bytecodes.h --init_bytecodes_asm /builddir/build/BUILD/qtwebkit-5.212.0-alpha3/DerivedSources/JavaScriptCore/InitBytecodes.asm /builddir/build/BUILD/qtwebkit-5.212.0-alpha3/Source/JavaScriptCore/bytecode/BytecodeList.json
make[2]: Leaving directory '/builddir/build/BUILD/qtwebkit-5.212.0-alpha3'
  File "/builddir/build/BUILD/qtwebkit-5.212.0-alpha3/Source/JavaScriptCore/generate-bytecode-files", line 94
    print "I/O error opening {0}, ({1}): {2}".format(path, e.errno, e.strerror)
          ^
SyntaxError: invalid syntax
make[2]: *** [Source/JavaScriptCore/CMakeFiles/LLIntOffsetsExtractor.dir/build.make:110: DerivedSources/JavaScriptCore/Bytecodes.h] Error 1
make[1]: *** [CMakeFiles/Makefile2:722: Source/JavaScriptCore/CMakeFiles/LLIntOffsetsExtractor.dir/all] Error 2
make[1]: *** Waiting for unfinished jobs....


Context in Source/JavaScriptCore/generate-bytecode-files where the error occurs:

def openOrExit(path, mode):
    try:
        return open(path, mode)
    except IOError as e:
        print "I/O error opening {0}, ({1}): {2}".format(path, e.errno, e.strerror)
        exit(1)

Comment 2 Markus S. 2020-03-28 14:17:51 UTC

New upstream release is out that fixes that problem. Package has not been updated, yet.

Comment 3 Rex Dieter 2020-03-29 02:21:41 UTC

Thanks, trying out an alpha4 scratch build now.

Comment 4 Rex Dieter 2020-04-24 16:17:04 UTC

Package updated in rawhide, builds underway