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config: values of pathname type can be prefixed with :(optional)

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Sometimes people want to specify additional configuration data
as "best effort" basis.  Maybe commit.template configuration file points
at somewhere in ~/template/ but on a particular system, the file may not
exist and the user may be OK without using the template in such a case.

When the value given to a configuration variable whose type is
pathname wants to signal such an optional file, it can be marked by
prepending ":(optional)" in front of it.  Such a setting that is
marked optional would avoid getting the command barf for a missing
file, as an optional configuration setting that names a missing
file is not even seen.

cf. <xmqq5ywehb69.fsf@gitster.g>

Signed-off-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: D. Ben Knoble <ben.knoble+github@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Junio C Hamano
2025-09-28 17:29:15 -04:00
parent 6b4f07325d
commit 749d6d166d
5 changed files with 41 additions and 4 deletions
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13
wrapper.c
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@@ -721,6 +721,19 @@ int xgethostname(char *buf, size_t len)
return ret;
}
int is_missing_file(const char *filename)
{
struct stat st;
if (stat(filename, &st) < 0) {
if (errno == ENOENT)
return 1;
die_errno(_("could not stat %s"), filename);
}
return 0;
}
int is_empty_or_missing_file(const char *filename)
{
struct stat st;