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submodule: improve submodule_has_commits() 

Teach 'submodule_has_commits()' to ensure that if a commit exists in a
submodule, that it is also reachable from a ref.

This is a preparatory step prior to merging the logic which checks for
changed submodules when fetching or pushing.

Signed-off-by: Brandon Williams <bmwill@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
maint
Brandon Williams 2017-05-01 18:02:38 -07:00 committed by Junio C Hamano
parent a6bb78c3b1
commit 7c8d2b00f2
1 changed files with 34 additions and 0 deletions
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34
submodule.c
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@ -644,10 +644,44 @@ static int submodule_has_commits(const char *path, struct oid_array *commits)
{
int has_commit = 1;

/*
* Perform a cheap, but incorrect check for the existance of 'commits'.
* This is done by adding the submodule's object store to the in-core
* object store, and then querying for each commit's existance. If we
* do not have the commit object anywhere, there is no chance we have
* it in the object store of the correct submodule and have it
* reachable from a ref, so we can fail early without spawning rev-list
* which is expensive.
*/
if (add_submodule_odb(path))
return 0;

oid_array_for_each_unique(commits, check_has_commit, &has_commit);

if (has_commit) {
/*
* Even if the submodule is checked out and the commit is
* present, make sure it exists in the submodule's object store
* and that it is reachable from a ref.
*/
struct child_process cp = CHILD_PROCESS_INIT;
struct strbuf out = STRBUF_INIT;

argv_array_pushl(&cp.args, "rev-list", "-n", "1", NULL);
oid_array_for_each_unique(commits, append_oid_to_argv, &cp.args);
argv_array_pushl(&cp.args, "--not", "--all", NULL);

prepare_submodule_repo_env(&cp.env_array);
cp.git_cmd = 1;
cp.no_stdin = 1;
cp.dir = path;

if (capture_command(&cp, &out, GIT_MAX_HEXSZ + 1) || out.len)
has_commit = 0;

strbuf_release(&out);
}

return has_commit;
}