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git/branch.c
Jonathan Nieder 82433cdf4d revert: write REVERT_HEAD pseudoref during conflicted revert
When conflicts are encountered while reverting a commit, it can be
handy to have the name of that commit easily available.  For example,
to produce a copy of the patch to refer to while resolving conflicts:

	$ git revert 2eceb2a8
	error: could not revert 2eceb2a8... awesome, buggy feature
	$ git show -R REVERT_HEAD >the-patch
	$ edit $(git diff --name-only)

Set a REVERT_HEAD pseudoref when "git revert" does not make a commit,
for cases like this.  This also makes it possible for scripts to
distinguish between a revert that encountered conflicts and other
sources of an unmerged index.

After successfully committing, resetting with "git reset", or moving
to another commit with "git checkout" or "git reset", the pseudoref is
no longer useful, so remove it.

Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2011-11-22 13:34:44 -08:00

251 lines
6 KiB
C

#include "cache.h"
#include "branch.h"
#include "refs.h"
#include "remote.h"
#include "commit.h"
#include "sequencer.h"
struct tracking {
struct refspec spec;
char *src;
const char *remote;
int matches;
};
static int find_tracked_branch(struct remote *remote, void *priv)
{
struct tracking *tracking = priv;
if (!remote_find_tracking(remote, &tracking->spec)) {
if (++tracking->matches == 1) {
tracking->src = tracking->spec.src;
tracking->remote = remote->name;
} else {
free(tracking->spec.src);
if (tracking->src) {
free(tracking->src);
tracking->src = NULL;
}
}
tracking->spec.src = NULL;
}
return 0;
}
static int should_setup_rebase(const char *origin)
{
switch (autorebase) {
case AUTOREBASE_NEVER:
return 0;
case AUTOREBASE_LOCAL:
return origin == NULL;
case AUTOREBASE_REMOTE:
return origin != NULL;
case AUTOREBASE_ALWAYS:
return 1;
}
return 0;
}
void install_branch_config(int flag, const char *local, const char *origin, const char *remote)
{
const char *shortname = remote + 11;
int remote_is_branch = !prefixcmp(remote, "refs/heads/");
struct strbuf key = STRBUF_INIT;
int rebasing = should_setup_rebase(origin);
if (remote_is_branch
&& !strcmp(local, shortname)
&& !origin) {
warning("Not setting branch %s as its own upstream.",
local);
return;
}
strbuf_addf(&key, "branch.%s.remote", local);
git_config_set(key.buf, origin ? origin : ".");
strbuf_reset(&key);
strbuf_addf(&key, "branch.%s.merge", local);
git_config_set(key.buf, remote);
if (rebasing) {
strbuf_reset(&key);
strbuf_addf(&key, "branch.%s.rebase", local);
git_config_set(key.buf, "true");
}
if (flag & BRANCH_CONFIG_VERBOSE) {
strbuf_reset(&key);
strbuf_addstr(&key, origin ? "remote" : "local");
/* Are we tracking a proper "branch"? */
if (remote_is_branch) {
strbuf_addf(&key, " branch %s", shortname);
if (origin)
strbuf_addf(&key, " from %s", origin);
}
else
strbuf_addf(&key, " ref %s", remote);
printf("Branch %s set up to track %s%s.\n",
local, key.buf,
rebasing ? " by rebasing" : "");
}
strbuf_release(&key);
}
/*
* This is called when new_ref is branched off of orig_ref, and tries
* to infer the settings for branch.<new_ref>.{remote,merge} from the
* config.
*/
static int setup_tracking(const char *new_ref, const char *orig_ref,
enum branch_track track)
{
struct tracking tracking;
if (strlen(new_ref) > 1024 - 7 - 7 - 1)
return error("Tracking not set up: name too long: %s",
new_ref);
memset(&tracking, 0, sizeof(tracking));
tracking.spec.dst = (char *)orig_ref;
if (for_each_remote(find_tracked_branch, &tracking))
return 1;
if (!tracking.matches)
switch (track) {
case BRANCH_TRACK_ALWAYS:
case BRANCH_TRACK_EXPLICIT:
case BRANCH_TRACK_OVERRIDE:
break;
default:
return 1;
}
if (tracking.matches > 1)
return error("Not tracking: ambiguous information for ref %s",
orig_ref);
install_branch_config(BRANCH_CONFIG_VERBOSE, new_ref, tracking.remote,
tracking.src ? tracking.src : orig_ref);
free(tracking.src);
return 0;
}
int validate_new_branchname(const char *name, struct strbuf *ref,
int force, int attr_only)
{
if (strbuf_check_branch_ref(ref, name))
die("'%s' is not a valid branch name.", name);
if (!ref_exists(ref->buf))
return 0;
else if (!force && !attr_only)
die("A branch named '%s' already exists.", ref->buf + strlen("refs/heads/"));
if (!attr_only) {
const char *head;
unsigned char sha1[20];
head = resolve_ref("HEAD", sha1, 0, NULL);
if (!is_bare_repository() && head && !strcmp(head, ref->buf))
die("Cannot force update the current branch.");
}
return 1;
}
void create_branch(const char *head,
const char *name, const char *start_name,
int force, int reflog, enum branch_track track)
{
struct ref_lock *lock = NULL;
struct commit *commit;
unsigned char sha1[20];
char *real_ref, msg[PATH_MAX + 20];
struct strbuf ref = STRBUF_INIT;
int forcing = 0;
int dont_change_ref = 0;
int explicit_tracking = 0;
if (track == BRANCH_TRACK_EXPLICIT || track == BRANCH_TRACK_OVERRIDE)
explicit_tracking = 1;
if (validate_new_branchname(name, &ref, force,
track == BRANCH_TRACK_OVERRIDE)) {
if (!force)
dont_change_ref = 1;
else
forcing = 1;
}
real_ref = NULL;
if (get_sha1(start_name, sha1))
die("Not a valid object name: '%s'.", start_name);
switch (dwim_ref(start_name, strlen(start_name), sha1, &real_ref)) {
case 0:
/* Not branching from any existing branch */
if (explicit_tracking)
die("Cannot setup tracking information; starting point is not a branch.");
break;
case 1:
/* Unique completion -- good, only if it is a real branch */
if (prefixcmp(real_ref, "refs/heads/") &&
prefixcmp(real_ref, "refs/remotes/")) {
if (explicit_tracking)
die("Cannot setup tracking information; starting point is not a branch.");
else
real_ref = NULL;
}
break;
default:
die("Ambiguous object name: '%s'.", start_name);
break;
}
if ((commit = lookup_commit_reference(sha1)) == NULL)
die("Not a valid branch point: '%s'.", start_name);
hashcpy(sha1, commit->object.sha1);
if (!dont_change_ref) {
lock = lock_any_ref_for_update(ref.buf, NULL, 0);
if (!lock)
die_errno("Failed to lock ref for update");
}
if (reflog)
log_all_ref_updates = 1;
if (forcing)
snprintf(msg, sizeof msg, "branch: Reset to %s",
start_name);
else if (!dont_change_ref)
snprintf(msg, sizeof msg, "branch: Created from %s",
start_name);
if (real_ref && track)
setup_tracking(ref.buf+11, real_ref, track);
if (!dont_change_ref)
if (write_ref_sha1(lock, sha1, msg) < 0)
die_errno("Failed to write ref");
strbuf_release(&ref);
free(real_ref);
}
void remove_branch_state(void)
{
unlink(git_path("CHERRY_PICK_HEAD"));
unlink(git_path("REVERT_HEAD"));
unlink(git_path("MERGE_HEAD"));
unlink(git_path("MERGE_RR"));
unlink(git_path("MERGE_MSG"));
unlink(git_path("MERGE_MODE"));
unlink(git_path("SQUASH_MSG"));
remove_sequencer_state(0);
}