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cLib: git pull: Perform a fast-forward if possible

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This way we don't always get the extra merge commit, if it is not
required.
This commit is contained in:
Vishesh Handa
2019-05-17 11:25:00 +02:00
parent 62c99db1be
commit 90c18881a9
1 changed files with 142 additions and 72 deletions
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86
gj_common/gitjournal.c
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@ -431,13 +431,50 @@ cleanup:
return err;
}
// Taken from merge.c libgit2 examples
static int perform_fastforward(git_repository *repo, const git_oid *target_oid)
{
git_checkout_options ff_checkout_options = GIT_CHECKOUT_OPTIONS_INIT;
git_reference *target_ref;
git_reference *new_target_ref;
git_object *target = NULL;
int err = 0;
err = git_repository_head(&target_ref, repo);
if (err != 0)
goto cleanup;
/* Lookup the target object */
err = git_object_lookup(&target, repo, target_oid, GIT_OBJECT_COMMIT);
if (err != 0)
goto cleanup;
/* Checkout the result so the workdir is in the expected state */
ff_checkout_options.checkout_strategy = GIT_CHECKOUT_SAFE;
err = git_checkout_tree(repo, target, &ff_checkout_options);
if (err != 0)
goto cleanup;
/* Move the target reference to the target OID */
err = git_reference_set_target(&new_target_ref, target_ref, target_oid, NULL);
if (err != 0)
goto cleanup;
cleanup:
git_reference_free(target_ref);
git_reference_free(new_target_ref);
git_object_free(target);
return err;
}
int gj_git_pull(const char *git_base_path, const char *author_name, const char *author_email)
{
int err = 0;
git_repository *repo = NULL;
git_remote *remote = NULL;
git_annotated_commit *annotated_commit = NULL;
git_reference *ref = NULL;
git_annotated_commit *origin_annotated_commit = NULL;
git_reference *origin_head_ref = NULL;
git_index *index = NULL;
git_index_conflict_iterator *conflict_iter = NULL;
git_signature *sig = NULL;
@ -475,18 +512,49 @@ int gj_git_pull(const char *git_base_path, const char *author_name, const char *
goto cleanup;
// FIXME: Do not hardcode the master branch!
err = git_reference_lookup(&ref, repo, "refs/remotes/origin/master");
err = git_reference_lookup(&origin_head_ref, repo, "refs/remotes/origin/master");
if (err < 0)
goto cleanup;
err = git_annotated_commit_from_ref(&annotated_commit, repo, ref);
err = git_annotated_commit_from_ref(&origin_annotated_commit, repo, origin_head_ref);
if (err < 0)
goto cleanup;
git_merge_analysis_t merge_analysis;
git_merge_preference_t merge_preference;
git_annotated_commit *annotated_commits[] = {origin_annotated_commit};
err = git_merge_analysis(&merge_analysis, &merge_preference, repo,
(const git_annotated_commit **)annotated_commits, 1);
if (err < 0)
goto cleanup;
if (merge_analysis & GIT_MERGE_ANALYSIS_UP_TO_DATE)
{
goto cleanup;
}
else if (merge_analysis & GIT_MERGE_ANALYSIS_UNBORN)
{
err = 5000;
gj_log("GitPull merge_analysis unborn\n");
goto cleanup;
}
else if (merge_analysis & GIT_MERGE_ANALYSIS_FASTFORWARD)
{
gj_log("GitPull: Performing FastForward\n");
err = perform_fastforward(repo, git_annotated_commit_id(origin_annotated_commit));
if (err < 0)
goto cleanup;
}
else if (merge_analysis & GIT_MERGE_ANALYSIS_NORMAL)
{
gj_log("GitPull: Performing Normal Merge\n");
git_merge_options merge_options = GIT_MERGE_OPTIONS_INIT;
git_checkout_options checkout_options = GIT_CHECKOUT_OPTIONS_INIT;
err = git_merge(repo, (const git_annotated_commit **)&annotated_commit, 1,
err = git_merge(repo, (const git_annotated_commit **)annotated_commits, 1,
&merge_options, &checkout_options);
if (err < 0)
goto cleanup;
@ -548,7 +616,8 @@ int gj_git_pull(const char *git_base_path, const char *author_name, const char *
if (err < 0)
goto cleanup;
err = git_commit_lookup(&origin_head_commit, repo, git_annotated_commit_id(annotated_commit));
err = git_commit_lookup(&origin_head_commit, repo,
git_annotated_commit_id(origin_annotated_commit));
if (err < 0)
goto cleanup;
@ -559,6 +628,7 @@ int gj_git_pull(const char *git_base_path, const char *author_name, const char *
err = git_commit_create(&commit_id, repo, "HEAD", sig, sig, NULL, message, tree, 2, parents);
if (err < 0)
goto cleanup;
}
cleanup:
git_tree_free(tree);
@ -568,8 +638,8 @@ cleanup:
git_repository_state_cleanup(repo);
git_index_conflict_iterator_free(conflict_iter);
git_index_free(index);
git_reference_free(ref);
git_annotated_commit_free(annotated_commit);
git_reference_free(origin_head_ref);
git_annotated_commit_free(origin_annotated_commit);
git_remote_free(remote);
git_repository_free(repo);