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check_everything_connected(): refactor to use an iterator

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We will be using the same "rev-list --verify-objects" logic to add a
sanity check to the receiving end of "git push" in the same way, but the
list of commits that are checked come from a structure with a different
shape over there.

Update the function to take an iterator to make it easier to reuse it in
different contexts.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Junio C Hamano 2011-09-02 16:22:47 -07:00
parent 6d4bb3833c
commit f0e278b1b7
1 changed files with 36 additions and 14 deletions
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50
builtin/fetch.c
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@ -346,27 +346,34 @@ static int update_local_ref(struct ref *ref,
}
/*
* The ref_map records the tips of the refs we are fetching. If
* Take callback data, and return next object name in the buffer.
* When called after returning the name for the last object, return -1
* to signal EOF, otherwise return 0.
*/
typedef int (*sha1_iterate_fn)(void *, unsigned char [20]);
/*
* If we feed all the commits we want to verify to this command
*
* $ git rev-list --verify-objects --stdin --not --all
*
* (feeding all the refs in ref_map on its standard input) does not
* error out, that means everything reachable from these updated refs
* locally exists and is connected to some of our existing refs.
* and if it does not error out, that means everything reachable from
* these commits locally exists and is connected to some of our
* existing refs.
*
* Returns 0 if everything is connected, non-zero otherwise.
*/
static int check_everything_connected(struct ref *ref_map, int quiet)
static int check_everything_connected(sha1_iterate_fn fn, int quiet, void *cb_data)
{
struct child_process rev_list;
const char *argv[] = {"rev-list", "--verify-objects",
"--stdin", "--not", "--all", NULL, NULL};
char commit[41];
struct ref *ref;
unsigned char sha1[20];
int err = 0;
if (!ref_map)
return 0;
if (fn(cb_data, sha1))
return err;
if (quiet)
argv[5] = "--quiet";
@ -383,8 +390,8 @@ static int check_everything_connected(struct ref *ref_map, int quiet)
sigchain_push(SIGPIPE, SIG_IGN);
commit[40] = '\n';
for (ref = ref_map; ref; ref = ref->next) {
memcpy(commit, sha1_to_hex(ref->old_sha1), 40);
do {
memcpy(commit, sha1_to_hex(sha1), 40);
if (write_in_full(rev_list.in, commit, 41) < 0) {
if (errno != EPIPE && errno != EINVAL)
error(_("failed write to rev-list: %s"),
@ -392,17 +399,29 @@ static int check_everything_connected(struct ref *ref_map, int quiet)
err = -1;
break;
}
}
} while (!fn(cb_data, sha1));
if (close(rev_list.in)) {
error(_("failed to close rev-list's stdin: %s"), strerror(errno));
err = -1;
}
sigchain_pop(SIGPIPE);
return finish_command(&rev_list) || err;
}
static int iterate_ref_map(void *cb_data, unsigned char sha1[20])
{
struct ref **rm = cb_data;
struct ref *ref = *rm;
if (!ref)
return -1; /* end of the list */
*rm = ref->next;
hashcpy(sha1, ref->old_sha1);
return 0;
}
static int store_updated_refs(const char *raw_url, const char *remote_name,
struct ref *ref_map)
{
@ -423,7 +442,8 @@ static int store_updated_refs(const char *raw_url, const char *remote_name,
else
url = xstrdup("foreign");
if (check_everything_connected(ref_map, 0))
rm = ref_map;
if (check_everything_connected(iterate_ref_map, 0, &rm))
return error(_("%s did not send all necessary objects\n"), url);
for (rm = ref_map; rm; rm = rm->next) {
@ -522,6 +542,8 @@ static int store_updated_refs(const char *raw_url, const char *remote_name,
*/
static int quickfetch(struct ref *ref_map)
{
struct ref *rm = ref_map;
/*
* If we are deepening a shallow clone we already have these
* objects reachable. Running rev-list here will return with
@ -531,7 +553,7 @@ static int quickfetch(struct ref *ref_map)
*/
if (depth)
return -1;
return check_everything_connected(ref_map, 1);
return check_everything_connected(iterate_ref_map, 1, &rm);
}
static int fetch_refs(struct transport *transport, struct ref *ref_map)