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move "--follow needs one pathspec" rule to diff_setup_done

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Because of the way "--follow" is implemented, we must have
exactly one pathspec. "git log" enforces this restriction,
but other users of the revision traversal code do not. For
example, "git format-patch --follow" will segfault during
try_to_follow_renames, as we have no pathspecs at all.

We can push this check down into diff_setup_done, which is
probably a better place anyway. It is the diff code that
introduces this restriction, so other parts of the code
should not need to care themselves.

Reported-by: "Michael S. Tsirkin" <mst@redhat.com>
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jeff King
2014-05-20 02:49:20 -04:00
committed by Junio C Hamano
parent 7bbc4e8fdb
commit dd63f169d9
2 changed files with 5 additions and 6 deletions
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3
diff.c
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@ -3317,6 +3317,9 @@ void diff_setup_done(struct diff_options *options)
options->output_format = DIFF_FORMAT_NO_OUTPUT;
DIFF_OPT_SET(options, EXIT_WITH_STATUS);
}
if (DIFF_OPT_TST(options, FOLLOW_RENAMES) && options->pathspec.nr != 1)
die(_("--follow requires exactly one pathspec"));
}
static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)