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https://github.com/git/git
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9ed36cfa35
"git branch" and "git checkout -b" now honor --track option even when the upstream branch is local. Previously --track was silently ignored when forking from a local branch. Also the command did not error out when --track was explicitly asked for but the forked point specified was not an existing branch (i.e. when there is no way to set up the tracking configuration), but now it correctly does. The configuration setting branch.autosetupmerge can now be set to "always", which is equivalent to using --track from the command line. Setting branch.autosetupmerge to "true" will retain the former behavior of only setting up branch.*.merge for remote upstream branches. Includes test cases for the new functionality. Signed-off-by: Jay Soffian <jaysoffian@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
152 lines
3.7 KiB
C
152 lines
3.7 KiB
C
#include "cache.h"
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#include "branch.h"
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#include "refs.h"
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#include "remote.h"
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#include "commit.h"
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struct tracking {
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struct refspec spec;
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char *src;
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const char *remote;
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int matches;
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};
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static int find_tracked_branch(struct remote *remote, void *priv)
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{
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struct tracking *tracking = priv;
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if (!remote_find_tracking(remote, &tracking->spec)) {
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if (++tracking->matches == 1) {
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tracking->src = tracking->spec.src;
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tracking->remote = remote->name;
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} else {
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free(tracking->spec.src);
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if (tracking->src) {
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free(tracking->src);
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tracking->src = NULL;
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}
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}
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tracking->spec.src = NULL;
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}
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return 0;
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}
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/*
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* This is called when new_ref is branched off of orig_ref, and tries
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* to infer the settings for branch.<new_ref>.{remote,merge} from the
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* config.
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*/
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static int setup_tracking(const char *new_ref, const char *orig_ref,
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enum branch_track track)
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{
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char key[1024];
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struct tracking tracking;
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if (strlen(new_ref) > 1024 - 7 - 7 - 1)
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return error("Tracking not set up: name too long: %s",
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new_ref);
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memset(&tracking, 0, sizeof(tracking));
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tracking.spec.dst = (char *)orig_ref;
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if (for_each_remote(find_tracked_branch, &tracking))
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return 1;
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if (!tracking.matches)
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switch (track) {
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case BRANCH_TRACK_ALWAYS:
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case BRANCH_TRACK_EXPLICIT:
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break;
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default:
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return 1;
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}
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if (tracking.matches > 1)
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return error("Not tracking: ambiguous information for ref %s",
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orig_ref);
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sprintf(key, "branch.%s.remote", new_ref);
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git_config_set(key, tracking.remote ? tracking.remote : ".");
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sprintf(key, "branch.%s.merge", new_ref);
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git_config_set(key, tracking.src ? tracking.src : orig_ref);
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free(tracking.src);
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printf("Branch %s set up to track %s branch %s.\n", new_ref,
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tracking.remote ? "remote" : "local", orig_ref);
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return 0;
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}
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void create_branch(const char *head,
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const char *name, const char *start_name,
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int force, int reflog, enum branch_track track)
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{
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struct ref_lock *lock;
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struct commit *commit;
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unsigned char sha1[20];
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char *real_ref, ref[PATH_MAX], msg[PATH_MAX + 20];
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int forcing = 0;
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snprintf(ref, sizeof ref, "refs/heads/%s", name);
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if (check_ref_format(ref))
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die("'%s' is not a valid branch name.", name);
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if (resolve_ref(ref, sha1, 1, NULL)) {
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if (!force)
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die("A branch named '%s' already exists.", name);
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else if (!is_bare_repository() && !strcmp(head, name))
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die("Cannot force update the current branch.");
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forcing = 1;
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}
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real_ref = NULL;
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if (get_sha1(start_name, sha1))
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die("Not a valid object name: '%s'.", start_name);
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switch (dwim_ref(start_name, strlen(start_name), sha1, &real_ref)) {
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case 0:
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/* Not branching from any existing branch */
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if (track == BRANCH_TRACK_EXPLICIT)
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die("Cannot setup tracking information; starting point is not a branch.");
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break;
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case 1:
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/* Unique completion -- good */
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break;
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default:
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die("Ambiguous object name: '%s'.", start_name);
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break;
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}
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if ((commit = lookup_commit_reference(sha1)) == NULL)
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die("Not a valid branch point: '%s'.", start_name);
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hashcpy(sha1, commit->object.sha1);
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lock = lock_any_ref_for_update(ref, NULL, 0);
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if (!lock)
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die("Failed to lock ref for update: %s.", strerror(errno));
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if (reflog)
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log_all_ref_updates = 1;
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if (forcing)
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snprintf(msg, sizeof msg, "branch: Reset from %s",
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start_name);
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else
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snprintf(msg, sizeof msg, "branch: Created from %s",
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start_name);
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if (real_ref && track)
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setup_tracking(name, real_ref, track);
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if (write_ref_sha1(lock, sha1, msg) < 0)
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die("Failed to write ref: %s.", strerror(errno));
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free(real_ref);
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}
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void remove_branch_state(void)
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{
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unlink(git_path("MERGE_HEAD"));
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unlink(git_path("rr-cache/MERGE_RR"));
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unlink(git_path("MERGE_MSG"));
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unlink(git_path("SQUASH_MSG"));
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}
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