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Merge pull request #5283 from pks-t/pks/example-checkout-remote-branch

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examples: checkout: implement guess heuristic for remote branches
This commit is contained in:
Patrick Steinhardt
2019-12-13 11:49:37 +01:00
committed by GitHub
parent 3e6a904521 a9b5270b9a
commit d2d01f7152
1 changed files with 78 additions and 5 deletions
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83
examples/checkout.c
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@@ -111,9 +111,10 @@ static void print_perf_data(const git_checkout_perfdata *perfdata, void *payload
* This is the main "checkout <branch>" function, responsible for performing
* a branch-based checkout.
*/
static int perform_checkout_ref(git_repository *repo, git_annotated_commit *target, checkout_options *opts)
static int perform_checkout_ref(git_repository *repo, git_annotated_commit *target, const char *target_ref, checkout_options *opts)
{
git_checkout_options checkout_opts = GIT_CHECKOUT_OPTIONS_INIT;
git_reference *ref = NULL, *branch = NULL;
git_commit *target_commit = NULL;
int err;
@@ -155,10 +156,25 @@ static int perform_checkout_ref(git_repository *repo, git_annotated_commit *targ
* we might need to detach HEAD.
*/
if (git_annotated_commit_ref(target)) {
err = git_repository_set_head(repo, git_annotated_commit_ref(target));
const char *target_head;
if ((err = git_reference_lookup(&ref, repo, git_annotated_commit_ref(target))) < 0)
goto error;
if (git_reference_is_remote(ref)) {
if ((err = git_branch_create_from_annotated(&branch, repo, target_ref, target, 0)) < 0)
goto error;
target_head = git_reference_name(branch);
} else {
target_head = git_annotated_commit_ref(target);
}
err = git_repository_set_head(repo, target_head);
} else {
err = git_repository_set_head_detached_from_annotated(repo, target);
}
error:
if (err != 0) {
fprintf(stderr, "failed to update HEAD reference: %s\n", git_error_last()->message);
goto cleanup;
@@ -166,10 +182,67 @@ static int perform_checkout_ref(git_repository *repo, git_annotated_commit *targ
cleanup:
git_commit_free(target_commit);
git_reference_free(branch);
git_reference_free(ref);
return err;
}
/**
* This corresponds to `git switch --guess`: if a given ref does
* not exist, git will by default try to guess the reference by
* seeing whether any remote has a branch called <ref>. If there
* is a single remote only that has it, then it is assumed to be
* the desired reference and a local branch is created for it.
*
* The following is a simplified implementation. It will not try
* to check whether the ref is unique across all remotes.
*/
static int guess_refish(git_annotated_commit **out, git_repository *repo, const char *ref)
{
git_strarray remotes = { NULL, 0 };
git_reference *remote_ref = NULL;
int error;
size_t i;
if ((error = git_remote_list(&remotes, repo)) < 0)
goto out;
for (i = 0; i < remotes.count; i++) {
char *refname = NULL;
size_t reflen;
reflen = snprintf(refname, 0, "refs/remotes/%s/%s", remotes.strings[i], ref);
if ((refname = malloc(reflen + 1)) == NULL) {
error = -1;
goto next;
}
snprintf(refname, reflen + 1, "refs/remotes/%s/%s", remotes.strings[i], ref);
if ((error = git_reference_lookup(&remote_ref, repo, refname)) < 0)
goto next;
break;
next:
free(refname);
if (error < 0 && error != GIT_ENOTFOUND)
break;
}
if (!remote_ref) {
error = GIT_ENOTFOUND;
goto out;
}
if ((error = git_annotated_commit_from_ref(out, repo, remote_ref)) < 0)
goto out;
out:
git_reference_free(remote_ref);
git_strarray_free(&remotes);
return error;
}
/** That example's entry point */
int lg2_checkout(git_repository *repo, int argc, char **argv)
{
@@ -202,12 +275,12 @@ int lg2_checkout(git_repository *repo, int argc, char **argv)
/**
* Try to resolve a "refish" argument to a target libgit2 can use
*/
err = resolve_refish(&checkout_target, repo, args.argv[args.pos]);
if (err != 0) {
if ((err = resolve_refish(&checkout_target, repo, args.argv[args.pos])) < 0 &&
(err = guess_refish(&checkout_target, repo, args.argv[args.pos])) < 0) {
fprintf(stderr, "failed to resolve %s: %s\n", args.argv[args.pos], git_error_last()->message);
goto cleanup;
}
err = perform_checkout_ref(repo, checkout_target, &opts);
err = perform_checkout_ref(repo, checkout_target, args.argv[args.pos], &opts);
}
cleanup: