doc: use an absolute path in sys.path to work around a python DLL loading bug
This bug[1] was causing the zstd entry under "Available Compression Engines" to
be omitted from the documentation for some versions of python3. I could
upgrade, but past upgrades have broken venvs and clobbered installed packages.
It's a trivial workaround, so there's no sense in leaving this subtle issue. It
was flushed out by changing the module policy here from 'allow' to 'c', and
seeing this error:
ImportError: DLL load failed while importing parsers: The parameter is incorrect.
[1] https://github.com/python/cpython/issues/87271
Differential Revision: https://phab.mercurial-scm.org/D12599
--- a/doc/gendoc.py Mon Apr 25 16:45:03 2022 +0200
+++ b/doc/gendoc.py Mon May 02 22:04:59 2022 -0400
@@ -22,7 +22,7 @@
# available. Relax C module requirements.
os.environ['HGMODULEPOLICY'] = 'allow'
# import from the live mercurial repo
-sys.path.insert(0, "..")
+sys.path.insert(0, os.path.abspath(".."))
from mercurial import demandimport
demandimport.enable()