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rev-parse: fix parent shorthands with --symbolic

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The try_parent_shorthands() function shows each parent via
show_rev(). We pass the correct parent sha1, but our "name"
parameter still points at the original refname. So asking
for a regular rev-parse works fine (it prints the sha1s),
but asking for the symbolic name gives nonsense like:

    $ git rev-parse --symbolic HEAD^-1
    HEAD
    ^HEAD

which is always an empty set of commits. Asking for "^!" is
likewise broken, with the added bonus that its prints ^HEAD
for _each_ parent. And "^@" just prints HEAD repeatedly.

Arguably it would be correct to just pass NULL as the name
here, and always get the parent expressed as a sha1. The
"--symbolic" documentaton claims only "as close to the
original input as possible", and we certainly fallback to
sha1s where necessary. But it's pretty easy to generate a
symbolic name on the fly from the original.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jeff King 2016-11-16 00:46:26 -08:00 committed by Junio C Hamano
parent 8c98a68981
commit a2e7b04c44
2 changed files with 24 additions and 1 deletions
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7
builtin/rev-parse.c
View file

@ -342,11 +342,16 @@ static int try_parent_shorthands(const char *arg)
for (parents = commit->parents, parent_number = 1;
parents;
parents = parents->next, parent_number++) {
char *name = NULL;
if (exclude_parent && parent_number != exclude_parent)
continue;
if (symbolic)
name = xstrfmt("%s^%d", arg, parent_number);
show_rev(include_parents ? NORMAL : REVERSED,
parents->item->object.oid.hash, arg);
parents->item->object.oid.hash, name);
free(name);
}
*dotdot = '^';

18
t/t6101-rev-parse-parents.sh
View file

@ -83,12 +83,24 @@ test_expect_success 'final^1^@ = final^1^1 final^1^2' '
test_cmp expect actual
'
test_expect_success 'symbolic final^1^@ = final^1^1 final^1^2' '
git rev-parse --symbolic final^1^1 final^1^2 >expect &&
git rev-parse --symbolic final^1^@ >actual &&
test_cmp expect actual
'
test_expect_success 'final^1^! = final^1 ^final^1^1 ^final^1^2' '
git rev-parse final^1 ^final^1^1 ^final^1^2 >expect &&
git rev-parse final^1^! >actual &&
test_cmp expect actual
'
test_expect_success 'symbolic final^1^! = final^1 ^final^1^1 ^final^1^2' '
git rev-parse --symbolic final^1 ^final^1^1 ^final^1^2 >expect &&
git rev-parse --symbolic final^1^! >actual &&
test_cmp expect actual
'
test_expect_success 'large graft octopus' '
test_cmp_rev_output b31 "git rev-parse --verify b1^30"
'
@ -143,6 +155,12 @@ test_expect_success 'rev-parse merge^-2 = merge^2..merge' '
test_cmp expect actual
'
test_expect_success 'symbolic merge^-1 = merge^1..merge' '
git rev-parse --symbolic merge^1..merge >expect &&
git rev-parse --symbolic merge^-1 >actual &&
test_cmp expect actual
'
test_expect_success 'rev-parse merge^-0 (invalid parent)' '
test_must_fail git rev-parse merge^-0
'