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git-reflog: add exists command

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This is necessary because alternate ref backends might store reflogs
somewhere other than .git/logs.  Code that now directly manipulates
.git/logs should instead go through git-reflog.

Signed-off-by: David Turner <dturner@twopensource.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
David Turner 2015-07-21 17:04:53 -04:00 committed by Junio C Hamano
parent abd0cd3a30
commit afcb2e7a3b
3 changed files with 41 additions and 1 deletions
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4
Documentation/git-reflog.txt
View file

@ -23,6 +23,7 @@ depending on the subcommand:
[--dry-run] [--verbose] [--all | <refs>...]
'git reflog delete' [--rewrite] [--updateref]
[--dry-run] [--verbose] ref@\{specifier\}...
'git reflog exists' <ref>
Reference logs, or "reflogs", record when the tips of branches and
other references were updated in the local repository. Reflogs are
@ -52,6 +53,9 @@ argument must be an _exact_ entry (e.g. "`git reflog delete
master@{2}`"). This subcommand is also typically not used directly by
end users.
The "exists" subcommand checks whether a ref has a reflog. It exits
with zero status if the reflog exists, and non-zero status if it does
not.
OPTIONS
-------

33
builtin/reflog.c
View file

@ -13,6 +13,8 @@ static const char reflog_expire_usage[] =
"git reflog expire [--expire=<time>] [--expire-unreachable=<time>] [--rewrite] [--updateref] [--stale-fix] [--dry-run | -n] [--verbose] [--all] <refs>...";
static const char reflog_delete_usage[] =
"git reflog delete [--rewrite] [--updateref] [--dry-run | -n] [--verbose] <refs>...";
static const char reflog_exists_usage[] =
"git reflog exists <ref>";
static unsigned long default_reflog_expire;
static unsigned long default_reflog_expire_unreachable;
@ -699,12 +701,38 @@ static int cmd_reflog_delete(int argc, const char **argv, const char *prefix)
return status;
}
static int cmd_reflog_exists(int argc, const char **argv, const char *prefix)
{
int i, start = 0;
for (i = 1; i < argc; i++) {
const char *arg = argv[i];
if (!strcmp(arg, "--")) {
i++;
break;
}
else if (arg[0] == '-')
usage(reflog_exists_usage);
else
break;
}
start = i;
if (argc - start != 1)
usage(reflog_exists_usage);
if (check_refname_format(argv[start], REFNAME_ALLOW_ONELEVEL))
die("invalid ref format: %s", argv[start]);
return !reflog_exists(argv[start]);
}
/*
* main "reflog"
*/
static const char reflog_usage[] =
"git reflog [ show | expire | delete ]";
"git reflog [ show | expire | delete | exists ]";
int cmd_reflog(int argc, const char **argv, const char *prefix)
{
@ -724,5 +752,8 @@ int cmd_reflog(int argc, const char **argv, const char *prefix)
if (!strcmp(argv[1], "delete"))
return cmd_reflog_delete(argc - 1, argv + 1, prefix);
if (!strcmp(argv[1], "exists"))
return cmd_reflog_exists(argc - 1, argv + 1, prefix);
return cmd_log_reflog(argc, argv, prefix);
}

5
t/t1411-reflog-show.sh
View file

@ -166,4 +166,9 @@ test_expect_success 'git log -g -p shows diffs vs. parents' '
test_cmp expect actual
'
test_expect_success 'reflog exists works' '
git reflog exists refs/heads/master &&
! git reflog exists refs/heads/nonexistent
'
test_done