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grep: fix "--" rev/pathspec disambiguation

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If we see "git grep pattern rev -- file" then we apply the
usual rev/pathspec disambiguation rules: any "rev" before
the "--" must be a revision, and we do not need to apply the
verify_non_filename() check.

But there are two bugs here:

  1. We keep a seen_dashdash flag to handle this case, but
     we set it in the same left-to-right pass over the
     arguments in which we parse "rev".

     So when we see "rev", we do not yet know that there is
     a "--", and we mistakenly complain if there is a
     matching file.

     We can fix this by making a preliminary pass over the
     arguments to find the "--", and only then checking the rev
     arguments.

  2. If we can't resolve "rev" but there isn't a dashdash,
     that's OK. We treat it like a path, and complain later
     if it doesn't exist.

     But if there _is_ a dashdash, then we know it must be a
     rev, and should treat it as such, complaining if it
     does not resolve. The current code instead ignores it
     and tries to treat it like a path.

This patch fixes both bugs, and tries to comment the parsing
flow a bit better.

It adds tests that cover the two bugs, but also some related
situations (which already worked, but this confirms that our
fixes did not break anything).

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jeff King 2017-02-14 01:05:55 -05:00 committed by Junio C Hamano
parent 20d6421cae
commit b5b81136da
2 changed files with 57 additions and 5 deletions
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29
builtin/grep.c
View file

@ -1149,7 +1149,22 @@ int cmd_grep(int argc, const char **argv, const char *prefix)
compile_grep_patterns(&opt);
/* Check revs and then paths */
/*
* We have to find "--" in a separate pass, because its presence
* influences how we will parse arguments that come before it.
*/
for (i = 0; i < argc; i++) {
if (!strcmp(argv[i], "--")) {
seen_dashdash = 1;
break;
}
}
/*
* Resolve any rev arguments. If we have a dashdash, then everything up
* to it must resolve as a rev. If not, then we stop at the first
* non-rev and assume everything else is a path.
*/
for (i = 0; i < argc; i++) {
const char *arg = argv[i];
unsigned char sha1[20];
@ -1158,13 +1173,14 @@ int cmd_grep(int argc, const char **argv, const char *prefix)
if (!strcmp(arg, "--")) {
i++;
seen_dashdash = 1;
break;
}
/* Stop at the first non-rev */
if (get_sha1_with_context(arg, 0, sha1, &oc))
if (get_sha1_with_context(arg, 0, sha1, &oc)) {
if (seen_dashdash)
die(_("unable to resolve revision: %s"), arg);
break;
}
object = parse_object_or_die(sha1, arg);
if (!seen_dashdash)
@ -1172,7 +1188,10 @@ int cmd_grep(int argc, const char **argv, const char *prefix)
add_object_array_with_path(object, arg, &list, oc.mode, oc.path);
}
/* The rest are paths */
/*
* Anything left over is presumed to be a path. But in the non-dashdash
* "do what I mean" case, we verify and complain when that isn't true.
*/
if (!seen_dashdash) {
int j;
for (j = i; j < argc; j++)

33
t/t7810-grep.sh
View file

@ -982,6 +982,39 @@ test_expect_success 'grep -e -- -- path' '
test_cmp expected actual
'
test_expect_success 'dashdash disambiguates rev as rev' '
test_when_finished "rm -f master" &&
echo content >master &&
echo master:hello.c >expect &&
git grep -l o master -- hello.c >actual &&
test_cmp expect actual
'
test_expect_success 'dashdash disambiguates pathspec as pathspec' '
test_when_finished "git rm -f master" &&
echo content >master &&
git add master &&
echo master:content >expect &&
git grep o -- master >actual &&
test_cmp expect actual
'
test_expect_success 'report bogus arg without dashdash' '
test_must_fail git grep o does-not-exist
'
test_expect_success 'report bogus rev with dashdash' '
test_must_fail git grep o hello.c --
'
test_expect_success 'allow non-existent path with dashdash' '
# We need a real match so grep exits with success.
tree=$(git ls-tree HEAD |
sed s/hello.c/not-in-working-tree/ |
git mktree) &&
git grep o "$tree" -- not-in-working-tree
'
test_expect_success 'grep --no-index pattern -- path' '
rm -fr non &&
mkdir -p non/git &&