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posix: always seek to EOF when opening a file in append mode...
posix: always seek to EOF when opening a file in append mode Python 3 already does this, so skip it there. Consider the program: #include <stdio.h> int main() { FILE *f = fopen("narf", "w"); fprintf(f, "narf\n"); fclose(f); f = fopen("narf", "a"); printf("%ld\n", ftell(f)); fprintf(f, "troz\n"); printf("%ld\n", ftell(f)); return 0; } on macOS, FreeBSD, and Linux with glibc, this program prints 5 10 but on musl libc (Alpine Linux and probably others) this prints 0 10 By my reading of https://pubs.opengroup.org/onlinepubs/009695399/functions/fopen.html this is technically correct, specifically: > Opening a file with append mode (a as the first character in the > mode argument) shall cause all subsequent writes to the file to be > forced to the then current end-of-file, regardless of intervening > calls to fseek(). in other words, the file position doesn't really matter in append-mode files, and we can't depend on it being at all meaningful unless we perform a seek() before tell() after open(..., 'a'). Experimentally after a .write() we can do a .tell() and it'll always be reasonable, but I'm unclear from reading the specification if that's a smart thing to rely on. This matches what we do on Windows and what Python 3 does for free, so let's just be consistent. Thanks to Yuya for the idea.
Matt Harbison - - Load All Authors

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r43163:97ada9b8 5.0.2 stable
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test-check-config.t
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#require test-repo
$ . "$TESTDIR/helpers-testrepo.sh"
Sanity check check-config.py
$ cat > testfile.py << EOF
> # Good
> foo = ui.config('ui', 'username')
> # Missing
> foo = ui.config('ui', 'doesnotexist')
> # Missing different type
> foo = ui.configint('ui', 'missingint')
> # Missing with default value
> foo = ui.configbool('ui', 'missingbool1', default=True)
> foo = ui.configbool('ui', 'missingbool2', False)
> # Inconsistent values for defaults.
> foo = ui.configint('ui', 'intdefault', default=1)
> foo = ui.configint('ui', 'intdefault', default=42)
> # Can suppress inconsistent value error
> foo = ui.configint('ui', 'intdefault2', default=1)
> # inconsistent config: ui.intdefault2
> foo = ui.configint('ui', 'intdefault2', default=42)
> EOF
$ cat > files << EOF
> mercurial/help/config.txt
> $TESTTMP/testfile.py
> EOF
$ cd "$TESTDIR"/..
$ "$PYTHON" contrib/check-config.py < $TESTTMP/files
foo = ui.configint('ui', 'intdefault', default=42)
conflict on ui.intdefault: ('int', '42') != ('int', '1')
at $TESTTMP/testfile.py:12:
undocumented: ui.doesnotexist (str)
undocumented: ui.intdefault (int) [42]
undocumented: ui.intdefault2 (int) [42]
undocumented: ui.missingbool1 (bool) [True]
undocumented: ui.missingbool2 (bool)
undocumented: ui.missingint (int)
New errors are not allowed. Warnings are strongly discouraged.
$ testrepohg files "set:(**.py or **.txt) - tests/**" | sed 's|\\|/|g' |
> "$PYTHON" contrib/check-config.py