Bug 1212650

Created attachment 867764 [details]
Patch for the "invalid mode" error when building SeaMonkey

Recently the SeaMonkey 2.53.16 package stopped compiling for Tumbleweed:

```
[   75s] ./mach --log-no-times configure
[   75s] Error running mach:
[   75s] 
[   75s]     ['--log-no-times', 'configure']
[   75s] 
[   75s] The error occurred in code that was called by the mach command. This is either
[   75s] a bug in the called code itself or in the way that mach is calling it.
[   75s] 
[   75s] You should consider filing a bug for this issue.
[   75s] 
[   75s] If filing a bug, please include the full output of mach, including this error
[   75s] message.
[   75s] 
[   75s] The details of the failure are as follows:
[   75s] 
[   75s] ValueError: invalid mode: 'rU'
[   75s] 
[   75s]   File "/home/abuild/rpmbuild/BUILD/seamonkey-2.53.16/mozilla/python/mozbuild/mozbuild/build_commands.py", line 98, in configure
[   75s]     return driver.configure(
[   75s]            ^^^^^^^^^^^^^^^^^
[   75s]   File "/home/abuild/rpmbuild/BUILD/seamonkey-2.53.16/mozilla/python/mozbuild/mozbuild/controller/building.py", line 1424, in configure
[   75s]     self._write_mozconfig_json()
[   75s]   File "/home/abuild/rpmbuild/BUILD/seamonkey-2.53.16/mozilla/python/mozbuild/mozbuild/controller/building.py", line 1505, in _write_mozconfig_json
[   75s]     with FileAvoidWrite(mozconfig_json) as fh:
[   75s]   File "/home/abuild/rpmbuild/BUILD/seamonkey-2.53.16/mozilla/python/mozbuild/mozbuild/util.py", line 345, in __exit__
[   75s]     self.close()
[   75s]   File "/home/abuild/rpmbuild/BUILD/seamonkey-2.53.16/mozilla/python/mozbuild/mozbuild/util.py", line 268, in close
[   75s]     existing = _open(self.name, self.mode)
[   75s]                ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[   75s]   File "/home/abuild/rpmbuild/BUILD/seamonkey-2.53.16/mozilla/python/mozbuild/mozbuild/util.py", line 66, in _open
[   75s]     return io.open(path, mode, encoding='utf-8', newline='\n')
[   75s]            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[   75s] make: *** [GNUmakefile:71: /home/abuild/rpmbuild/BUILD/seamonkey-2.53.16/mozilla/obj-x86_64-pc-linux-gnu/Makefile] Error 1
[   75s] error: Bad exit status from /var/tmp/rpm-tmp.qjzAE2 (%build)

```

Applying the attached patch, which changes all instances of 'rU' to 'r' and all instances of "rU" to "r" in the Python source files, works around this "invalid mode" error, but then throws up a new one:

```
[   33s] /usr/bin/gmake -f client.mk MOZ_PARALLEL_BUILD=12 -s configure
[   33s] cd /home/abuild/rpmbuild/BUILD/seamonkey-2.53.16/mozilla/obj-x86_64-pc-linux-gnu
[   33s] /home/abuild/rpmbuild/BUILD/seamonkey-2.53.16/mozilla/configure
[   33s] Creating Python 3 environment
[   33s] /home/abuild/rpmbuild/BUILD/seamonkey-2.53.16/mozilla/third_party/python/virtualenv/virtualenv.py:24: DeprecationWarning: The distutils package is deprecated and slated for removal in Python 3.12. Use setuptools or check PEP 632 for potential alternatives
[   33s]   import distutils.spawn
[   33s] /home/abuild/rpmbuild/BUILD/seamonkey-2.53.16/mozilla/third_party/python/virtualenv/virtualenv.py:25: DeprecationWarning: The distutils.sysconfig module is deprecated, use sysconfig instead
[   33s]   import distutils.sysconfig
[   33s] Using base prefix '/usr'
[   33s] New python executable in /home/abuild/rpmbuild/BUILD/seamonkey-2.53.16/mozilla/obj-x86_64-pc-linux-gnu/_virtualenvs/init_py3/bin/python3
[   33s] Also creating executable in /home/abuild/rpmbuild/BUILD/seamonkey-2.53.16/mozilla/obj-x86_64-pc-linux-gnu/_virtualenvs/init_py3/bin/python
[   33s] ERROR: The executable /home/abuild/rpmbuild/BUILD/seamonkey-2.53.16/mozilla/obj-x86_64-pc-linux-gnu/_virtualenvs/init_py3/bin/python3 is not functioning
[   33s] ERROR: It thinks sys.prefix is '/usr' (should be '/home/abuild/rpmbuild/BUILD/seamonkey-2.53.16/mozilla/obj-x86_64-pc-linux-gnu/_virtualenvs/init_py3')
[   33s] ERROR: virtualenv is not compatible with this system or executable
```

I think the problem might be that the build system is now installing Python 3.x (in addition to Python 2.7) whereas before it was installing only Python 2.7.  The spec file has `BuildRequires` only for `python-devel` and `python2-xml` which I think should pull in only Python 2.7, so there might be some other `BuildRequires` that now depends on Python 3.x.

According to [the release notes of SeaMonkey 2.53.17beta1](https://www.seamonkey-project.org/releases/seamonkey2.53.17/), the build system in that version now uses Python 3 ([or maybe not](https://bugzilla.mozilla.org/show_bug.cgi?id=1840074)), so perhaps this problem can simply be ignored until the release of 2.53.17.  I'm not really sure what else can be done to fix this issue for the 2.53.16 package -- perhaps some of the 2.53.17beta1 changes can be backported, but I don't know if this is sufficient, or if there is perhaps a quicker workaround.