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Fix shallow root maintenance during fetch #6846

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Merged
ethomson merged 1 commit into from
Jul 10, 2024
Merged

Fix shallow root maintenance during fetch #6846

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1 change: 1 addition & 0 deletions src/libgit2/transports/smart_protocol.c
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Original file line number Diff line number Diff line change
Expand Up @@ -394,6 +394,7 @@ static int setup_shallow_roots(

memcpy(out->ptr, wants->shallow_roots,
sizeof(git_oid) * wants->shallow_roots_len);
out->size = wants->shallow_roots_len;
}

return 0;
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148 changes: 145 additions & 3 deletions tests/libgit2/online/shallow.c
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Original file line number Diff line number Diff line change
Expand Up @@ -242,10 +242,15 @@ void test_online_shallow__shorten_four(void)
cl_assert_equal_b(true, git_repository_is_shallow(repo));

cl_git_pass(git_repository__shallow_roots(&roots, &roots_len, repo));
cl_assert_equal_i(3, roots_len);
cl_assert_equal_s("d86a2aada2f5e7ccf6f11880bfb9ab404e8a8864", git_oid_tostr_s(&roots[0]));
cl_assert_equal_s("59706a11bde2b9899a278838ef20a97e8f8795d2", git_oid_tostr_s(&roots[1]));
cl_assert_equal_i(6, roots_len);
/* roots added during initial clone, not removed as not encountered during fetch */
cl_assert_equal_s("c070ad8c08840c8116da865b2d65593a6bb9cd2a", git_oid_tostr_s(&roots[0]));
cl_assert_equal_s("0966a434eb1a025db6b71485ab63a3bfbea520b6", git_oid_tostr_s(&roots[1]));
cl_assert_equal_s("83834a7afdaa1a1260568567f6ad90020389f664", git_oid_tostr_s(&roots[3]));
/* roots added during fetch */
cl_assert_equal_s("bab66b48f836ed950c99134ef666436fb07a09a0", git_oid_tostr_s(&roots[2]));
cl_assert_equal_s("59706a11bde2b9899a278838ef20a97e8f8795d2", git_oid_tostr_s(&roots[4]));
cl_assert_equal_s("d86a2aada2f5e7ccf6f11880bfb9ab404e8a8864", git_oid_tostr_s(&roots[5]));

git_revwalk_new(&walk, repo);
git_revwalk_push_head(walk);
Expand All @@ -263,3 +268,140 @@ void test_online_shallow__shorten_four(void)
git_revwalk_free(walk);
git_repository_free(repo);
}

void test_online_shallow__preserve_unrelated_roots(void)
{
git_str path = GIT_STR_INIT;
git_repository *repo;
git_revwalk *walk;
git_fetch_options fetch_opts = GIT_FETCH_OPTIONS_INIT;
git_remote *origin = NULL;
git_strarray refspecs;
git_oid oid;
git_oid *roots;
size_t roots_len;
size_t num_commits = 0;
int error = 0;
git_oid first_oid;
git_oid second_oid;
git_oid third_oid;
char *first_commit = "c070ad8c08840c8116da865b2d65593a6bb9cd2a";
char *second_commit = "6e1475206e57110fcef4b92320436c1e9872a322";
char *third_commit = "7f822839a2fe9760f386cbbbcb3f92c5fe81def7";

#ifdef GIT_EXPERIMENTAL_SHA256
cl_git_pass(git_oid_fromstr(&first_oid, first_commit, GIT_OID_SHA1));
cl_git_pass(git_oid_fromstr(&second_oid, second_commit, GIT_OID_SHA1));
cl_git_pass(git_oid_fromstr(&third_oid, third_commit, GIT_OID_SHA1));
#else
cl_git_pass(git_oid_fromstr(&first_oid, first_commit));
cl_git_pass(git_oid_fromstr(&second_oid, second_commit));
cl_git_pass(git_oid_fromstr(&third_oid, third_commit));
#endif

/* setup empty repository without cloning */
git_str_joinpath(&path, clar_sandbox_path(), "preserve_unrelated_roots");
cl_git_pass(git_repository_init(&repo, git_str_cstr(&path), true));
cl_git_pass(git_remote_create(&origin, repo, "origin", "https://github.com/libgit2/TestGitRepository"));
cl_assert_equal_b(false, git_repository_is_shallow(repo));

/* shallow fetch for first commit */
fetch_opts.depth = 1;
refspecs.strings = &first_commit;
refspecs.count = 1;
cl_git_pass(git_remote_fetch(origin, &refspecs, &fetch_opts, NULL));
cl_assert_equal_b(true, git_repository_is_shallow(repo));

cl_git_pass(git_repository__shallow_roots(&roots, &roots_len, repo));
cl_assert_equal_i(1, roots_len);
cl_assert_equal_s("c070ad8c08840c8116da865b2d65593a6bb9cd2a", git_oid_tostr_s(&roots[0]));

cl_git_pass(git_revwalk_new(&walk, repo));
cl_git_pass(git_revwalk_push(walk, &first_oid));
while ((error = git_revwalk_next(&oid, walk)) == GIT_OK) {
num_commits++;
}
cl_assert_equal_i(num_commits, 1);
cl_assert_equal_i(error, GIT_ITEROVER);

/* shallow fetch for second commit */
fetch_opts.depth = 1;
refspecs.strings = &second_commit;
refspecs.count = 1;
cl_git_pass(git_remote_fetch(origin, &refspecs, &fetch_opts, NULL));
cl_assert_equal_b(true, git_repository_is_shallow(repo));

git__free(roots);
cl_git_pass(git_repository__shallow_roots(&roots, &roots_len, repo));
cl_assert_equal_i(2, roots_len);
cl_assert_equal_s("c070ad8c08840c8116da865b2d65593a6bb9cd2a", git_oid_tostr_s(&roots[0]));
cl_assert_equal_s("6e1475206e57110fcef4b92320436c1e9872a322", git_oid_tostr_s(&roots[1]));

git_revwalk_free(walk);
cl_git_pass(git_revwalk_new(&walk, repo));
cl_git_pass(git_revwalk_push(walk, &second_oid));
num_commits = 0;
while ((error = git_revwalk_next(&oid, walk)) == GIT_OK) {
num_commits++;
}
cl_assert_equal_i(error, GIT_ITEROVER);
cl_assert_equal_i(num_commits, 1);

/* fetch full history for third commit, includes first commit which should be removed from shallow roots */
fetch_opts.depth = 100;
refspecs.strings = &third_commit;
refspecs.count = 1;
cl_git_pass(git_remote_fetch(origin, &refspecs, &fetch_opts, NULL));
cl_assert_equal_b(true, git_repository_is_shallow(repo));

git__free(roots);
cl_git_pass(git_repository__shallow_roots(&roots, &roots_len, repo));
cl_assert_equal_i(1, roots_len);
cl_assert_equal_s("6e1475206e57110fcef4b92320436c1e9872a322", git_oid_tostr_s(&roots[0]));

git_revwalk_free(walk);
cl_git_pass(git_revwalk_new(&walk, repo));
cl_git_pass(git_revwalk_push(walk, &third_oid));
num_commits = 0;
while ((error = git_revwalk_next(&oid, walk)) == GIT_OK) {
num_commits++;
}
cl_assert_equal_i(error, GIT_ITEROVER);
cl_assert_equal_i(num_commits, 12);

cl_git_pass(git_revwalk_reset(walk));
cl_git_pass(git_revwalk_push(walk, &second_oid));
num_commits = 0;
while ((error = git_revwalk_next(&oid, walk)) == GIT_OK) {
num_commits++;
}
cl_assert_equal_i(error, GIT_ITEROVER);
cl_assert_equal_i(num_commits, 1);

/* unshallow repository without specifying any refspec */
fetch_opts.depth = GIT_FETCH_DEPTH_UNSHALLOW;
cl_git_pass(git_remote_fetch(origin, NULL, &fetch_opts, NULL));
cl_assert_equal_b(false, git_repository_is_shallow(repo));

git__free(roots);
cl_git_pass(git_repository__shallow_roots(&roots, &roots_len, repo));
cl_assert_equal_i(0, roots_len);

git_revwalk_free(walk);
cl_git_pass(git_revwalk_new(&walk, repo));
cl_git_pass(git_revwalk_push(walk, &first_oid));
cl_git_pass(git_revwalk_push(walk, &second_oid));
cl_git_pass(git_revwalk_push(walk, &third_oid));
num_commits = 0;
while ((error = git_revwalk_next(&oid, walk)) == GIT_OK) {
num_commits++;
}
cl_assert_equal_i(error, GIT_ITEROVER);
cl_assert_equal_i(num_commits, 18);

git__free(roots);
git_remote_free(origin);
git_str_dispose(&path);
git_revwalk_free(walk);
git_repository_free(repo);
}