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Move create_branch into a library file

You can also create branches, in exactly the same way, with checkout -b.

This introduces branch.{c,h} library files for doing porcelain-level
operations on branches (such as creating them with their appropriate
default configuration).

Signed-off-by: Daniel Barkalow <barkalow@iabervon.org>
maint
Daniel Barkalow 17 years ago committed by Junio C Hamano
parent
commit
e496c00348
  1. 2
      Makefile
  2. 140
      branch.c
  3. 8
      branch.h
  4. 138
      builtin-branch.c

2
Makefile

@ -317,7 +317,7 @@ LIB_OBJS = \ @@ -317,7 +317,7 @@ LIB_OBJS = \
alloc.o merge-file.o path-list.o help.o unpack-trees.o $(DIFF_OBJS) \
color.o wt-status.o archive-zip.o archive-tar.o shallow.o utf8.o \
convert.o attr.o decorate.o progress.o mailmap.o symlinks.o remote.o \
transport.o bundle.o walker.o parse-options.o ws.o archive.o
transport.o bundle.o walker.o parse-options.o ws.o archive.o branch.o

BUILTIN_OBJS = \
builtin-add.o \

140
branch.c

@ -0,0 +1,140 @@ @@ -0,0 +1,140 @@
#include "cache.h"
#include "branch.h"
#include "refs.h"
#include "remote.h"
#include "commit.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;
}

/*
* 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)
{
char key[1024];
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) ||
!tracking.matches)
return 1;

if (tracking.matches > 1)
return error("Not tracking: ambiguous information for ref %s",
orig_ref);

if (tracking.matches == 1) {
sprintf(key, "branch.%s.remote", new_ref);
git_config_set(key, tracking.remote ? tracking.remote : ".");
sprintf(key, "branch.%s.merge", new_ref);
git_config_set(key, tracking.src);
free(tracking.src);
printf("Branch %s set up to track remote branch %s.\n",
new_ref, orig_ref);
}

return 0;
}

void create_branch(const char *head,
const char *name, const char *start_name,
int force, int reflog, int track)
{
struct ref_lock *lock;
struct commit *commit;
unsigned char sha1[20];
char *real_ref, ref[PATH_MAX], msg[PATH_MAX + 20];
int forcing = 0;

snprintf(ref, sizeof ref, "refs/heads/%s", name);
if (check_ref_format(ref))
die("'%s' is not a valid branch name.", name);

if (resolve_ref(ref, sha1, 1, NULL)) {
if (!force)
die("A branch named '%s' already exists.", name);
else if (!is_bare_repository() && !strcmp(head, name))
die("Cannot force update the current branch.");
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 */
real_ref = NULL;
break;
case 1:
/* Unique completion -- good */
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);

lock = lock_any_ref_for_update(ref, NULL, 0);
if (!lock)
die("Failed to lock ref for update: %s.", strerror(errno));

if (reflog)
log_all_ref_updates = 1;

if (forcing)
snprintf(msg, sizeof msg, "branch: Reset from %s",
start_name);
else
snprintf(msg, sizeof msg, "branch: Created from %s",
start_name);

/* When branching off a remote branch, set up so that git-pull
automatically merges from there. So far, this is only done for
remotes registered via .git/config. */
if (real_ref && track)
setup_tracking(name, real_ref);

if (write_ref_sha1(lock, sha1, msg) < 0)
die("Failed to write ref: %s.", strerror(errno));

if (real_ref)
free(real_ref);
}

8
branch.h

@ -0,0 +1,8 @@ @@ -0,0 +1,8 @@
#ifndef BRANCH_H
#define BRANCH_H

void create_branch(const char *head,
const char *name, const char *start_name,
int force, int reflog, int track);

#endif

138
builtin-branch.c

@ -12,6 +12,7 @@ @@ -12,6 +12,7 @@
#include "builtin.h"
#include "remote.h"
#include "parse-options.h"
#include "branch.h"

static const char * const builtin_branch_usage[] = {
"git-branch [options] [-r | -a]",
@ -356,141 +357,6 @@ static void print_ref_list(int kinds, int detached, int verbose, int abbrev, str @@ -356,141 +357,6 @@ static void print_ref_list(int kinds, int detached, int verbose, int abbrev, str
free_ref_list(&ref_list);
}

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;
}


/*
* 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)
{
char key[1024];
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) ||
!tracking.matches)
return 1;

if (tracking.matches > 1)
return error("Not tracking: ambiguous information for ref %s",
orig_ref);

if (tracking.matches == 1) {
sprintf(key, "branch.%s.remote", new_ref);
git_config_set(key, tracking.remote ? tracking.remote : ".");
sprintf(key, "branch.%s.merge", new_ref);
git_config_set(key, tracking.src);
free(tracking.src);
printf("Branch %s set up to track remote branch %s.\n",
new_ref, orig_ref);
}

return 0;
}

static void create_branch(const char *name, const char *start_name,
int force, int reflog, int track)
{
struct ref_lock *lock;
struct commit *commit;
unsigned char sha1[20];
char *real_ref, ref[PATH_MAX], msg[PATH_MAX + 20];
int forcing = 0;

snprintf(ref, sizeof ref, "refs/heads/%s", name);
if (check_ref_format(ref))
die("'%s' is not a valid branch name.", name);

if (resolve_ref(ref, sha1, 1, NULL)) {
if (!force)
die("A branch named '%s' already exists.", name);
else if (!is_bare_repository() && !strcmp(head, name))
die("Cannot force update the current branch.");
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 */
real_ref = NULL;
break;
case 1:
/* Unique completion -- good */
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);

lock = lock_any_ref_for_update(ref, NULL, 0);
if (!lock)
die("Failed to lock ref for update: %s.", strerror(errno));

if (reflog)
log_all_ref_updates = 1;

if (forcing)
snprintf(msg, sizeof msg, "branch: Reset from %s",
start_name);
else
snprintf(msg, sizeof msg, "branch: Created from %s",
start_name);

/* When branching off a remote branch, set up so that git-pull
automatically merges from there. So far, this is only done for
remotes registered via .git/config. */
if (real_ref && track)
setup_tracking(name, real_ref);

if (write_ref_sha1(lock, sha1, msg) < 0)
die("Failed to write ref: %s.", strerror(errno));

if (real_ref)
free(real_ref);
}

static void rename_branch(const char *oldname, const char *newname, int force)
{
char oldref[PATH_MAX], newref[PATH_MAX], logmsg[PATH_MAX*2 + 100];
@ -611,7 +477,7 @@ int cmd_branch(int argc, const char **argv, const char *prefix) @@ -611,7 +477,7 @@ int cmd_branch(int argc, const char **argv, const char *prefix)
else if (rename && (argc == 2))
rename_branch(argv[0], argv[1], rename > 1);
else if (argc <= 2)
create_branch(argv[0], (argc == 2) ? argv[1] : head,
create_branch(head, argv[0], (argc == 2) ? argv[1] : head,
force_create, reflog, track);
else
usage_with_options(builtin_branch_usage, options);

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