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699 lines (553 loc) · 16.6 KB
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/*
* Copyright (C) the libgit2 contributors. All rights reserved.
*
* This file is part of libgit2, distributed under the GNU GPL v2 with
* a Linking Exception. For full terms see the included COPYING file.
*/
#include "branch.h"
#include "commit.h"
#include "tag.h"
#include "config.h"
#include "refspec.h"
#include "refs.h"
#include "remote.h"
#include "annotated_commit.h"
#include "worktree.h"
#include "git2/branch.h"
static int retrieve_branch_reference(
git_reference **branch_reference_out,
git_repository *repo,
const char *branch_name,
int is_remote)
{
git_reference *branch = NULL;
int error = 0;
char *prefix;
git_buf ref_name = GIT_BUF_INIT;
prefix = is_remote ? GIT_REFS_REMOTES_DIR : GIT_REFS_HEADS_DIR;
if ((error = git_buf_joinpath(&ref_name, prefix, branch_name)) < 0)
/* OOM */;
else if ((error = git_reference_lookup(&branch, repo, ref_name.ptr)) < 0)
giterr_set(
GITERR_REFERENCE, "cannot locate %s branch '%s'",
is_remote ? "remote-tracking" : "local", branch_name);
*branch_reference_out = branch; /* will be NULL on error */
git_buf_dispose(&ref_name);
return error;
}
static int not_a_local_branch(const char *reference_name)
{
giterr_set(
GITERR_INVALID,
"reference '%s' is not a local branch.", reference_name);
return -1;
}
static int create_branch(
git_reference **ref_out,
git_repository *repository,
const char *branch_name,
const git_commit *commit,
const char *from,
int force)
{
int is_unmovable_head = 0;
git_reference *branch = NULL;
git_buf canonical_branch_name = GIT_BUF_INIT,
log_message = GIT_BUF_INIT;
int error = -1;
int bare = git_repository_is_bare(repository);
assert(branch_name && commit && ref_out);
assert(git_object_owner((const git_object *)commit) == repository);
if (!git__strcmp(branch_name, "HEAD")) {
giterr_set(GITERR_REFERENCE, "'HEAD' is not a valid branch name");
error = -1;
goto cleanup;
}
if (force && !bare && git_branch_lookup(&branch, repository, branch_name, GIT_BRANCH_LOCAL) == 0) {
error = git_branch_is_head(branch);
git_reference_free(branch);
branch = NULL;
if (error < 0)
goto cleanup;
is_unmovable_head = error;
}
if (is_unmovable_head && force) {
giterr_set(GITERR_REFERENCE, "cannot force update branch '%s' as it is "
"the current HEAD of the repository.", branch_name);
error = -1;
goto cleanup;
}
if (git_buf_joinpath(&canonical_branch_name, GIT_REFS_HEADS_DIR, branch_name) < 0)
goto cleanup;
if (git_buf_printf(&log_message, "branch: Created from %s", from) < 0)
goto cleanup;
error = git_reference_create(&branch, repository,
git_buf_cstr(&canonical_branch_name), git_commit_id(commit), force,
git_buf_cstr(&log_message));
if (!error)
*ref_out = branch;
cleanup:
git_buf_dispose(&canonical_branch_name);
git_buf_dispose(&log_message);
return error;
}
int git_branch_create(
git_reference **ref_out,
git_repository *repository,
const char *branch_name,
const git_commit *commit,
int force)
{
return create_branch(ref_out, repository, branch_name, commit, git_oid_tostr_s(git_commit_id(commit)), force);
}
int git_branch_create_from_annotated(
git_reference **ref_out,
git_repository *repository,
const char *branch_name,
const git_annotated_commit *commit,
int force)
{
return create_branch(ref_out,
repository, branch_name, commit->commit, commit->description, force);
}
static int branch_equals(git_repository *repo, const char *path, void *payload)
{
git_reference *branch = (git_reference *) payload;
git_reference *head = NULL;
int equal = 0;
if (git_reference__read_head(&head, repo, path) < 0 ||
git_reference_type(head) != GIT_REF_SYMBOLIC)
goto done;
equal = !git__strcmp(head->target.symbolic, branch->name);
done:
git_reference_free(head);
return equal;
}
int git_branch_is_checked_out(const git_reference *branch)
{
assert(branch && git_reference_is_branch(branch));
return git_repository_foreach_head(git_reference_owner(branch),
branch_equals, (void *) branch) == 1;
}
int git_branch_delete(git_reference *branch)
{
int is_head;
git_buf config_section = GIT_BUF_INIT;
int error = -1;
assert(branch);
if (!git_reference_is_branch(branch) && !git_reference_is_remote(branch)) {
giterr_set(GITERR_INVALID, "reference '%s' is not a valid branch.",
git_reference_name(branch));
return GIT_ENOTFOUND;
}
if ((is_head = git_branch_is_head(branch)) < 0)
return is_head;
if (is_head) {
giterr_set(GITERR_REFERENCE, "cannot delete branch '%s' as it is "
"the current HEAD of the repository.", git_reference_name(branch));
return -1;
}
if (git_reference_is_branch(branch) && git_branch_is_checked_out(branch)) {
giterr_set(GITERR_REFERENCE, "Cannot delete branch '%s' as it is "
"the current HEAD of a linked repository.", git_reference_name(branch));
return -1;
}
if (git_buf_join(&config_section, '.', "branch",
git_reference_name(branch) + strlen(GIT_REFS_HEADS_DIR)) < 0)
goto on_error;
if (git_config_rename_section(
git_reference_owner(branch), git_buf_cstr(&config_section), NULL) < 0)
goto on_error;
error = git_reference_delete(branch);
on_error:
git_buf_dispose(&config_section);
return error;
}
typedef struct {
git_reference_iterator *iter;
unsigned int flags;
} branch_iter;
int git_branch_next(git_reference **out, git_branch_t *out_type, git_branch_iterator *_iter)
{
branch_iter *iter = (branch_iter *) _iter;
git_reference *ref;
int error;
while ((error = git_reference_next(&ref, iter->iter)) == 0) {
if ((iter->flags & GIT_BRANCH_LOCAL) &&
!git__prefixcmp(ref->name, GIT_REFS_HEADS_DIR)) {
*out = ref;
*out_type = GIT_BRANCH_LOCAL;
return 0;
} else if ((iter->flags & GIT_BRANCH_REMOTE) &&
!git__prefixcmp(ref->name, GIT_REFS_REMOTES_DIR)) {
*out = ref;
*out_type = GIT_BRANCH_REMOTE;
return 0;
} else {
git_reference_free(ref);
}
}
return error;
}
int git_branch_iterator_new(
git_branch_iterator **out,
git_repository *repo,
git_branch_t list_flags)
{
branch_iter *iter;
iter = git__calloc(1, sizeof(branch_iter));
GITERR_CHECK_ALLOC(iter);
iter->flags = list_flags;
if (git_reference_iterator_new(&iter->iter, repo) < 0) {
git__free(iter);
return -1;
}
*out = (git_branch_iterator *) iter;
return 0;
}
void git_branch_iterator_free(git_branch_iterator *_iter)
{
branch_iter *iter = (branch_iter *) _iter;
if (iter == NULL)
return;
git_reference_iterator_free(iter->iter);
git__free(iter);
}
int git_branch_move(
git_reference **out,
git_reference *branch,
const char *new_branch_name,
int force)
{
git_buf new_reference_name = GIT_BUF_INIT,
old_config_section = GIT_BUF_INIT,
new_config_section = GIT_BUF_INIT,
log_message = GIT_BUF_INIT;
int error;
assert(branch && new_branch_name);
if (!git_reference_is_branch(branch))
return not_a_local_branch(git_reference_name(branch));
if ((error = git_buf_joinpath(&new_reference_name, GIT_REFS_HEADS_DIR, new_branch_name)) < 0)
goto done;
if ((error = git_buf_printf(&log_message, "branch: renamed %s to %s",
git_reference_name(branch), git_buf_cstr(&new_reference_name))) < 0)
goto done;
/* first update ref then config so failure won't trash config */
error = git_reference_rename(
out, branch, git_buf_cstr(&new_reference_name), force,
git_buf_cstr(&log_message));
if (error < 0)
goto done;
git_buf_join(&old_config_section, '.', "branch",
git_reference_name(branch) + strlen(GIT_REFS_HEADS_DIR));
git_buf_join(&new_config_section, '.', "branch", new_branch_name);
error = git_config_rename_section(
git_reference_owner(branch),
git_buf_cstr(&old_config_section),
git_buf_cstr(&new_config_section));
done:
git_buf_dispose(&new_reference_name);
git_buf_dispose(&old_config_section);
git_buf_dispose(&new_config_section);
git_buf_dispose(&log_message);
return error;
}
int git_branch_lookup(
git_reference **ref_out,
git_repository *repo,
const char *branch_name,
git_branch_t branch_type)
{
assert(ref_out && repo && branch_name);
return retrieve_branch_reference(ref_out, repo, branch_name, branch_type == GIT_BRANCH_REMOTE);
}
int git_branch_name(
const char **out,
const git_reference *ref)
{
const char *branch_name;
assert(out && ref);
branch_name = ref->name;
if (git_reference_is_branch(ref)) {
branch_name += strlen(GIT_REFS_HEADS_DIR);
} else if (git_reference_is_remote(ref)) {
branch_name += strlen(GIT_REFS_REMOTES_DIR);
} else {
giterr_set(GITERR_INVALID,
"reference '%s' is neither a local nor a remote branch.", ref->name);
return -1;
}
*out = branch_name;
return 0;
}
static int retrieve_upstream_configuration(
git_buf *out,
const git_config *config,
const char *canonical_branch_name,
const char *format)
{
git_buf buf = GIT_BUF_INIT;
int error;
if (git_buf_printf(&buf, format,
canonical_branch_name + strlen(GIT_REFS_HEADS_DIR)) < 0)
return -1;
error = git_config_get_string_buf(out, config, git_buf_cstr(&buf));
git_buf_dispose(&buf);
return error;
}
int git_branch_upstream_name(
git_buf *out,
git_repository *repo,
const char *refname)
{
git_buf remote_name = GIT_BUF_INIT;
git_buf merge_name = GIT_BUF_INIT;
git_buf buf = GIT_BUF_INIT;
int error = -1;
git_remote *remote = NULL;
const git_refspec *refspec;
git_config *config;
assert(out && refname);
git_buf_sanitize(out);
if (!git_reference__is_branch(refname))
return not_a_local_branch(refname);
if ((error = git_repository_config_snapshot(&config, repo)) < 0)
return error;
if ((error = retrieve_upstream_configuration(
&remote_name, config, refname, "branch.%s.remote")) < 0)
goto cleanup;
if ((error = retrieve_upstream_configuration(
&merge_name, config, refname, "branch.%s.merge")) < 0)
goto cleanup;
if (git_buf_len(&remote_name) == 0 || git_buf_len(&merge_name) == 0) {
giterr_set(GITERR_REFERENCE,
"branch '%s' does not have an upstream", refname);
error = GIT_ENOTFOUND;
goto cleanup;
}
if (strcmp(".", git_buf_cstr(&remote_name)) != 0) {
if ((error = git_remote_lookup(&remote, repo, git_buf_cstr(&remote_name))) < 0)
goto cleanup;
refspec = git_remote__matching_refspec(remote, git_buf_cstr(&merge_name));
if (!refspec) {
error = GIT_ENOTFOUND;
goto cleanup;
}
if (git_refspec_transform(&buf, refspec, git_buf_cstr(&merge_name)) < 0)
goto cleanup;
} else
if (git_buf_set(&buf, git_buf_cstr(&merge_name), git_buf_len(&merge_name)) < 0)
goto cleanup;
error = git_buf_set(out, git_buf_cstr(&buf), git_buf_len(&buf));
cleanup:
git_config_free(config);
git_remote_free(remote);
git_buf_dispose(&remote_name);
git_buf_dispose(&merge_name);
git_buf_dispose(&buf);
return error;
}
int git_branch_upstream_remote(git_buf *buf, git_repository *repo, const char *refname)
{
int error;
git_config *cfg;
if (!git_reference__is_branch(refname))
return not_a_local_branch(refname);
if ((error = git_repository_config__weakptr(&cfg, repo)) < 0)
return error;
git_buf_sanitize(buf);
if ((error = retrieve_upstream_configuration(buf, cfg, refname, "branch.%s.remote")) < 0)
return error;
if (git_buf_len(buf) == 0) {
giterr_set(GITERR_REFERENCE, "branch '%s' does not have an upstream remote", refname);
error = GIT_ENOTFOUND;
git_buf_clear(buf);
}
return error;
}
int git_branch_remote_name(git_buf *buf, git_repository *repo, const char *refname)
{
git_strarray remote_list = {0};
size_t i;
git_remote *remote;
const git_refspec *fetchspec;
int error = 0;
char *remote_name = NULL;
assert(buf && repo && refname);
git_buf_sanitize(buf);
/* Verify that this is a remote branch */
if (!git_reference__is_remote(refname)) {
giterr_set(GITERR_INVALID, "reference '%s' is not a remote branch.",
refname);
error = GIT_ERROR;
goto cleanup;
}
/* Get the remotes */
if ((error = git_remote_list(&remote_list, repo)) < 0)
goto cleanup;
/* Find matching remotes */
for (i = 0; i < remote_list.count; i++) {
if ((error = git_remote_lookup(&remote, repo, remote_list.strings[i])) < 0)
continue;
fetchspec = git_remote__matching_dst_refspec(remote, refname);
if (fetchspec) {
/* If we have not already set out yet, then set
* it to the matching remote name. Otherwise
* multiple remotes match this reference, and it
* is ambiguous. */
if (!remote_name) {
remote_name = remote_list.strings[i];
} else {
git_remote_free(remote);
giterr_set(GITERR_REFERENCE,
"reference '%s' is ambiguous", refname);
error = GIT_EAMBIGUOUS;
goto cleanup;
}
}
git_remote_free(remote);
}
if (remote_name) {
git_buf_clear(buf);
error = git_buf_puts(buf, remote_name);
} else {
giterr_set(GITERR_REFERENCE,
"could not determine remote for '%s'", refname);
error = GIT_ENOTFOUND;
}
cleanup:
if (error < 0)
git_buf_dispose(buf);
git_strarray_free(&remote_list);
return error;
}
int git_branch_upstream(
git_reference **tracking_out,
const git_reference *branch)
{
int error;
git_buf tracking_name = GIT_BUF_INIT;
if ((error = git_branch_upstream_name(&tracking_name,
git_reference_owner(branch), git_reference_name(branch))) < 0)
return error;
error = git_reference_lookup(
tracking_out,
git_reference_owner(branch),
git_buf_cstr(&tracking_name));
git_buf_dispose(&tracking_name);
return error;
}
static int unset_upstream(git_config *config, const char *shortname)
{
git_buf buf = GIT_BUF_INIT;
if (git_buf_printf(&buf, "branch.%s.remote", shortname) < 0)
return -1;
if (git_config_delete_entry(config, git_buf_cstr(&buf)) < 0)
goto on_error;
git_buf_clear(&buf);
if (git_buf_printf(&buf, "branch.%s.merge", shortname) < 0)
goto on_error;
if (git_config_delete_entry(config, git_buf_cstr(&buf)) < 0)
goto on_error;
git_buf_dispose(&buf);
return 0;
on_error:
git_buf_dispose(&buf);
return -1;
}
int git_branch_set_upstream(git_reference *branch, const char *upstream_name)
{
git_buf key = GIT_BUF_INIT, value = GIT_BUF_INIT;
git_reference *upstream;
git_repository *repo;
git_remote *remote = NULL;
git_config *config;
const char *name, *shortname;
int local, error;
const git_refspec *fetchspec;
name = git_reference_name(branch);
if (!git_reference__is_branch(name))
return not_a_local_branch(name);
if (git_repository_config__weakptr(&config, git_reference_owner(branch)) < 0)
return -1;
shortname = name + strlen(GIT_REFS_HEADS_DIR);
if (upstream_name == NULL)
return unset_upstream(config, shortname);
repo = git_reference_owner(branch);
/* First we need to figure out whether it's a branch or remote-tracking */
if (git_branch_lookup(&upstream, repo, upstream_name, GIT_BRANCH_LOCAL) == 0)
local = 1;
else if (git_branch_lookup(&upstream, repo, upstream_name, GIT_BRANCH_REMOTE) == 0)
local = 0;
else {
giterr_set(GITERR_REFERENCE,
"cannot set upstream for branch '%s'", shortname);
return GIT_ENOTFOUND;
}
/*
* If it's local, the remote is "." and the branch name is
* simply the refname. Otherwise we need to figure out what
* the remote-tracking branch's name on the remote is and use
* that.
*/
if (local)
error = git_buf_puts(&value, ".");
else
error = git_branch_remote_name(&value, repo, git_reference_name(upstream));
if (error < 0)
goto on_error;
if (git_buf_printf(&key, "branch.%s.remote", shortname) < 0)
goto on_error;
if (git_config_set_string(config, git_buf_cstr(&key), git_buf_cstr(&value)) < 0)
goto on_error;
if (local) {
git_buf_clear(&value);
if (git_buf_puts(&value, git_reference_name(upstream)) < 0)
goto on_error;
} else {
/* Get the remoe-tracking branch's refname in its repo */
if (git_remote_lookup(&remote, repo, git_buf_cstr(&value)) < 0)
goto on_error;
fetchspec = git_remote__matching_dst_refspec(remote, git_reference_name(upstream));
git_buf_clear(&value);
if (!fetchspec || git_refspec_rtransform(&value, fetchspec, git_reference_name(upstream)) < 0)
goto on_error;
git_remote_free(remote);
remote = NULL;
}
git_buf_clear(&key);
if (git_buf_printf(&key, "branch.%s.merge", shortname) < 0)
goto on_error;
if (git_config_set_string(config, git_buf_cstr(&key), git_buf_cstr(&value)) < 0)
goto on_error;
git_reference_free(upstream);
git_buf_dispose(&key);
git_buf_dispose(&value);
return 0;
on_error:
git_reference_free(upstream);
git_buf_dispose(&key);
git_buf_dispose(&value);
git_remote_free(remote);
return -1;
}
int git_branch_is_head(
const git_reference *branch)
{
git_reference *head;
bool is_same = false;
int error;
assert(branch);
if (!git_reference_is_branch(branch))
return false;
error = git_repository_head(&head, git_reference_owner(branch));
if (error == GIT_EUNBORNBRANCH || error == GIT_ENOTFOUND)
return false;
if (error < 0)
return -1;
is_same = strcmp(
git_reference_name(branch),
git_reference_name(head)) == 0;
git_reference_free(head);
return is_same;
}
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