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mercurial fails to build with Python 3.15.0b1. + make install-doc DESTDIR=/builddir/build/BUILD/mercurial-7.2.1-build/BUILDROOT MANDIR=/usr/share/man make -C doc PREFIX="/usr/local" install make[1]: Entering directory '/builddir/build/BUILD/mercurial-7.2.1-build/mercurial-7.2.1/doc' python3 gendoc.py commandlist > commandlist.txt.tmp Traceback (most recent call last): File "/usr/lib64/python3.15/tomllib/_parser.py", line 13, in <module> from ._re import ( ImportError: deferred import of 'tomllib._re.RE_DATETIME' raised an exception during resolution The above exception was the direct cause of the following exception: Traceback (most recent call last): File "/builddir/build/BUILD/mercurial-7.2.1-build/mercurial-7.2.1/doc/gendoc.py", line 48, in <module> initialization.init() ^^^^^^^^^^^^^^^^^^^ File "<frozen importlib.util>", line 208, in __getattribute__ File "<frozen importlib._bootstrap_external>", line 747, in exec_module File "<frozen importlib._bootstrap>", line 549, in _call_with_frames_removed File "/builddir/build/BUILD/mercurial-7.2.1-build/mercurial-7.2.1/mercurial/initialization.py", line 67, in <module> admin_chainsaw.init() ^^^^^^^^^^^^^^^^^^^ File "<frozen importlib.util>", line 208, in __getattribute__ File "<frozen importlib._bootstrap_external>", line 747, in exec_module File "<frozen importlib._bootstrap>", line 549, in _call_with_frames_removed File "/builddir/build/BUILD/mercurial-7.2.1-build/mercurial-7.2.1/mercurial/admin/chainsaw.py", line 46, in <module> command = registrar.command(tables.command_table) ^^^^^^^^^^^^^^^^^ File "<frozen importlib.util>", line 208, in __getattribute__ File "<frozen importlib._bootstrap_external>", line 747, in exec_module File "<frozen importlib._bootstrap>", line 549, in _call_with_frames_removed File "/builddir/build/BUILD/mercurial-7.2.1-build/mercurial-7.2.1/mercurial/registrar.py", line 22, in <module> configitem = configitems.getitemregister ^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "<frozen importlib.util>", line 208, in __getattribute__ File "<frozen importlib._bootstrap_external>", line 747, in exec_module File "<frozen importlib._bootstrap>", line 549, in _call_with_frames_removed File "/builddir/build/BUILD/mercurial-7.2.1-build/mercurial-7.2.1/mercurial/configitems.py", line 215, in <module> import_configitems_from_file() ~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^ File "/builddir/build/BUILD/mercurial-7.2.1-build/mercurial-7.2.1/mercurial/configitems.py", line 184, in import_configitems_from_file as_toml = read_configitems_file() File "/builddir/build/BUILD/mercurial-7.2.1-build/mercurial-7.2.1/mercurial/configitems.py", line 155, in read_configitems_file return tomllib.load(fp) ~~~~~~~~~~~~^^^^ File "/usr/lib64/python3.15/tomllib/_parser.py", line 148, in load return loads(s, parse_float=parse_float) File "/usr/lib64/python3.15/tomllib/_parser.py", line 189, in loads pos = key_value_rule(src, pos, out, header, parse_float) File "/usr/lib64/python3.15/tomllib/_parser.py", line 418, in key_value_rule pos, key, value = parse_key_value_pair(src, pos, parse_float) ~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^ File "/usr/lib64/python3.15/tomllib/_parser.py", line 461, in parse_key_value_pair pos, value = parse_value(src, pos, parse_float) ~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^ File "/usr/lib64/python3.15/tomllib/_parser.py", line 725, in parse_value datetime_match = RE_DATETIME.match(src, pos) ^^^^^^^^^^^ ImportError: cannot import name 'RE_DATETIME' from 'tomllib._re' (/usr/lib64/python3.15/tomllib/_re.py) python3 gendoc.py "hg-ssh.8" > hg-ssh.8.txt.tmp Traceback (most recent call last): File "/usr/lib64/python3.15/tomllib/_parser.py", line 13, in <module> from ._re import ( ImportError: deferred import of 'tomllib._re.RE_DATETIME' raised an exception during resolution The above exception was the direct cause of the following exception: Traceback (most recent call last): File "/builddir/build/BUILD/mercurial-7.2.1-build/mercurial-7.2.1/doc/gendoc.py", line 48, in <module> initialization.init() ^^^^^^^^^^^^^^^^^^^ File "<frozen importlib.util>", line 208, in __getattribute__ File "<frozen importlib._bootstrap_external>", line 747, in exec_module File "<frozen importlib._bootstrap>", line 549, in _call_with_frames_removed File "/builddir/build/BUILD/mercurial-7.2.1-build/mercurial-7.2.1/mercurial/initialization.py", line 67, in <module> admin_chainsaw.init() ^^^^^^^^^^^^^^^^^^^ File "<frozen importlib.util>", line 208, in __getattribute__ File "<frozen importlib._bootstrap_external>", line 747, in exec_module File "<frozen importlib._bootstrap>", line 549, in _call_with_frames_removed File "/builddir/build/BUILD/mercurial-7.2.1-build/mercurial-7.2.1/mercurial/admin/chainsaw.py", line 46, in <module> command = registrar.command(tables.command_table) ^^^^^^^^^^^^^^^^^ File "<frozen importlib.util>", line 208, in __getattribute__ File "<frozen importlib._bootstrap_external>", line 747, in exec_module File "<frozen importlib._bootstrap>", line 549, in _call_with_frames_removed File "/builddir/build/BUILD/mercurial-7.2.1-build/mercurial-7.2.1/mercurial/registrar.py", line 22, in <module> configitem = configitems.getitemregister ^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "<frozen importlib.util>", line 208, in __getattribute__ File "<frozen importlib._bootstrap_external>", line 747, in exec_module File "<frozen importlib._bootstrap>", line 549, in _call_with_frames_removed File "/builddir/build/BUILD/mercurial-7.2.1-build/mercurial-7.2.1/mercurial/configitems.py", line 215, in <module> import_configitems_from_file() ~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^ File "/builddir/build/BUILD/mercurial-7.2.1-build/mercurial-7.2.1/mercurial/configitems.py", line 184, in import_configitems_from_file as_toml = read_configitems_file() File "/builddir/build/BUILD/mercurial-7.2.1-build/mercurial-7.2.1/mercurial/configitems.py", line 155, in read_configitems_file return tomllib.load(fp) ~~~~~~~~~~~~^^^^ File "/usr/lib64/python3.15/tomllib/_parser.py", line 148, in load return loads(s, parse_float=parse_float) File "/usr/lib64/python3.15/tomllib/_parser.py", line 189, in loads pos = key_value_rule(src, pos, out, header, parse_float) File "/usr/lib64/python3.15/tomllib/_parser.py", line 418, in key_value_rule pos, key, value = parse_key_value_pair(src, pos, parse_float) ~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^ File "/usr/lib64/python3.15/tomllib/_parser.py", line 461, in parse_key_value_pair pos, value = parse_value(src, pos, parse_float) ~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^ File "/usr/lib64/python3.15/tomllib/_parser.py", line 725, in parse_value datetime_match = RE_DATETIME.match(src, pos) ^^^^^^^^^^^ ImportError: cannot import name 'RE_DATETIME' from 'tomllib._re' (/usr/lib64/python3.15/tomllib/_re.py) make[1]: Leaving directory '/builddir/build/BUILD/mercurial-7.2.1-build/mercurial-7.2.1/doc' https://docs.python.org/3.15/whatsnew/3.15.html For the build logs, see: https://copr-be.cloud.fedoraproject.org/results/@python/python3.15-b1/fedora-rawhide-x86_64/10462782-mercurial/ For all our attempts to build mercurial with Python 3.15, see: https://copr.fedorainfracloud.org/coprs/g/python/python3.15-b1/package/mercurial/ Testing and mass rebuild of packages is happening in copr. You can follow these instructions to test locally in mock if your package builds with Python 3.15: https://copr.fedorainfracloud.org/coprs/g/python/python3.15-b1/ Let us know here if you have any questions. Python 3.15 is planned to be included in Fedora 45. To make that update smoother, we're building Fedora packages with all pre-releases of Python 3.15. A build failure prevents us from testing all dependent packages (transitive [Build]Requires), so if this package is required a lot, it's important for us to get it fixed soon. We'd appreciate help from the people who know this package best, but if you don't want to work on this now, let us know so we can try to work around it on our side.
I do not seem to be able to reproduce the problem with my local 3.15 . At a glance it could seem to be a problem internal to Python tomllib. It could potentially be caused by hgdemandimport, with a solution / workaround of blacklisting in hgdemandimport/__init__.py .
PR: https://src.fedoraproject.org/rpms/mercurial/pull-request/26#