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checkout.c
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#include "cache.h"
#include "builtin.h"
#include "parse-options.h"
#include "refs.h"
#include "commit.h"
#include "tree.h"
#include "tree-walk.h"
#include "cache-tree.h"
#include "unpack-trees.h"
#include "dir.h"
#include "run-command.h"
#include "merge-recursive.h"
#include "branch.h"
#include "diff.h"
#include "revision.h"
#include "remote.h"
#include "blob.h"
#include "xdiff-interface.h"
#include "ll-merge.h"
#include "resolve-undo.h"
#include "submodule.h"
#include "argv-array.h"
static const char * const checkout_usage[] = {
N_("git checkout [options] <branch>"),
N_("git checkout [options] [<branch>] -- <file>..."),
NULL,
};
struct checkout_opts {
int patch_mode;
int quiet;
int merge;
int force;
int force_detach;
int writeout_stage;
int overwrite_ignore;
const char *new_branch;
const char *new_branch_force;
const char *new_orphan_branch;
int new_branch_log;
enum branch_track track;
struct diff_options diff_options;
int branch_exists;
const char *prefix;
const char **pathspec;
struct tree *source_tree;
};
static int post_checkout_hook(struct commit *old, struct commit *new,
int changed)
{
return run_hook(NULL, "post-checkout",
sha1_to_hex(old ? old->object.sha1 : null_sha1),
sha1_to_hex(new ? new->object.sha1 : null_sha1),
changed ? "1" : "0", NULL);
/* "new" can be NULL when checking out from the index before
a commit exists. */
}
static int update_some(const unsigned char *sha1, const char *base, int baselen,
const char *pathname, unsigned mode, int stage, void *context)
{
int len;
struct cache_entry *ce;
if (S_ISDIR(mode))
return READ_TREE_RECURSIVE;
len = baselen + strlen(pathname);
ce = xcalloc(1, cache_entry_size(len));
hashcpy(ce->sha1, sha1);
memcpy(ce->name, base, baselen);
memcpy(ce->name + baselen, pathname, len - baselen);
ce->ce_flags = create_ce_flags(0) | CE_UPDATE;
ce->ce_namelen = len;
ce->ce_mode = create_ce_mode(mode);
add_cache_entry(ce, ADD_CACHE_OK_TO_ADD | ADD_CACHE_OK_TO_REPLACE);
return 0;
}
static int read_tree_some(struct tree *tree, const char **pathspec)
{
struct pathspec ps;
init_pathspec(&ps, pathspec);
read_tree_recursive(tree, "", 0, 0, &ps, update_some, NULL);
free_pathspec(&ps);
/* update the index with the given tree's info
* for all args, expanding wildcards, and exit
* with any non-zero return code.
*/
return 0;
}
static int skip_same_name(struct cache_entry *ce, int pos)
{
while (++pos < active_nr &&
!strcmp(active_cache[pos]->name, ce->name))
; /* skip */
return pos;
}
static int check_stage(int stage, struct cache_entry *ce, int pos)
{
while (pos < active_nr &&
!strcmp(active_cache[pos]->name, ce->name)) {
if (ce_stage(active_cache[pos]) == stage)
return 0;
pos++;
}
if (stage == 2)
return error(_("path '%s' does not have our version"), ce->name);
else
return error(_("path '%s' does not have their version"), ce->name);
}
static int check_stages(unsigned stages, struct cache_entry *ce, int pos)
{
unsigned seen = 0;
const char *name = ce->name;
while (pos < active_nr) {
ce = active_cache[pos];
if (strcmp(name, ce->name))
break;
seen |= (1 << ce_stage(ce));
pos++;
}
if ((stages & seen) != stages)
return error(_("path '%s' does not have all necessary versions"),
name);
return 0;
}
static int checkout_stage(int stage, struct cache_entry *ce, int pos,
struct checkout *state)
{
while (pos < active_nr &&
!strcmp(active_cache[pos]->name, ce->name)) {
if (ce_stage(active_cache[pos]) == stage)
return checkout_entry(active_cache[pos], state, NULL);
pos++;
}
if (stage == 2)
return error(_("path '%s' does not have our version"), ce->name);
else
return error(_("path '%s' does not have their version"), ce->name);
}
static int checkout_merged(int pos, struct checkout *state)
{
struct cache_entry *ce = active_cache[pos];
const char *path = ce->name;
mmfile_t ancestor, ours, theirs;
int status;
unsigned char sha1[20];
mmbuffer_t result_buf;
unsigned char threeway[3][20];
unsigned mode = 0;
memset(threeway, 0, sizeof(threeway));
while (pos < active_nr) {
int stage;
stage = ce_stage(ce);
if (!stage || strcmp(path, ce->name))
break;
hashcpy(threeway[stage - 1], ce->sha1);
if (stage == 2)
mode = create_ce_mode(ce->ce_mode);
pos++;
ce = active_cache[pos];
}
if (is_null_sha1(threeway[1]) || is_null_sha1(threeway[2]))
return error(_("path '%s' does not have necessary versions"), path);
read_mmblob(&ancestor, threeway[0]);
read_mmblob(&ours, threeway[1]);
read_mmblob(&theirs, threeway[2]);
/*
* NEEDSWORK: re-create conflicts from merges with
* merge.renormalize set, too
*/
status = ll_merge(&result_buf, path, &ancestor, "base",
&ours, "ours", &theirs, "theirs", NULL);
free(ancestor.ptr);
free(ours.ptr);
free(theirs.ptr);
if (status < 0 || !result_buf.ptr) {
free(result_buf.ptr);
return error(_("path '%s': cannot merge"), path);
}
/*
* NEEDSWORK:
* There is absolutely no reason to write this as a blob object
* and create a phony cache entry just to leak. This hack is
* primarily to get to the write_entry() machinery that massages
* the contents to work-tree format and writes out which only
* allows it for a cache entry. The code in write_entry() needs
* to be refactored to allow us to feed a <buffer, size, mode>
* instead of a cache entry. Such a refactoring would help
* merge_recursive as well (it also writes the merge result to the
* object database even when it may contain conflicts).
*/
if (write_sha1_file(result_buf.ptr, result_buf.size,
blob_type, sha1))
die(_("Unable to add merge result for '%s'"), path);
ce = make_cache_entry(mode, sha1, path, 2, 0);
if (!ce)
die(_("make_cache_entry failed for path '%s'"), path);
status = checkout_entry(ce, state, NULL);
return status;
}
static int checkout_paths(const struct checkout_opts *opts,
const char *revision)
{
int pos;
struct checkout state;
static char *ps_matched;
unsigned char rev[20];
int flag;
struct commit *head;
int errs = 0;
int stage = opts->writeout_stage;
int merge = opts->merge;
int newfd;
struct lock_file *lock_file;
if (opts->track != BRANCH_TRACK_UNSPECIFIED)
die(_("'%s' cannot be used with updating paths"), "--track");
if (opts->new_branch_log)
die(_("'%s' cannot be used with updating paths"), "-l");
if (opts->force && opts->patch_mode)
die(_("'%s' cannot be used with updating paths"), "-f");
if (opts->force_detach)
die(_("'%s' cannot be used with updating paths"), "--detach");
if (opts->merge && opts->patch_mode)
die(_("'%s' cannot be used with %s"), "--merge", "--patch");
if (opts->force && opts->merge)
die(_("'%s' cannot be used with %s"), "-f", "-m");
if (opts->new_branch)
die(_("Cannot update paths and switch to branch '%s' at the same time."),
opts->new_branch);
if (opts->patch_mode)
return run_add_interactive(revision, "--patch=checkout",
opts->pathspec);
lock_file = xcalloc(1, sizeof(struct lock_file));
newfd = hold_locked_index(lock_file, 1);
if (read_cache_preload(opts->pathspec) < 0)
return error(_("corrupt index file"));
if (opts->source_tree)
read_tree_some(opts->source_tree, opts->pathspec);
for (pos = 0; opts->pathspec[pos]; pos++)
;
ps_matched = xcalloc(1, pos);
for (pos = 0; pos < active_nr; pos++) {
struct cache_entry *ce = active_cache[pos];
if (opts->source_tree && !(ce->ce_flags & CE_UPDATE))
continue;
match_pathspec(opts->pathspec, ce->name, ce_namelen(ce), 0, ps_matched);
}
if (report_path_error(ps_matched, opts->pathspec, opts->prefix))
return 1;
/* "checkout -m path" to recreate conflicted state */
if (opts->merge)
unmerge_cache(opts->pathspec);
/* Any unmerged paths? */
for (pos = 0; pos < active_nr; pos++) {
struct cache_entry *ce = active_cache[pos];
if (match_pathspec(opts->pathspec, ce->name, ce_namelen(ce), 0, NULL)) {
if (!ce_stage(ce))
continue;
if (opts->force) {
warning(_("path '%s' is unmerged"), ce->name);
} else if (stage) {
errs |= check_stage(stage, ce, pos);
} else if (opts->merge) {
errs |= check_stages((1<<2) | (1<<3), ce, pos);
} else {
errs = 1;
error(_("path '%s' is unmerged"), ce->name);
}
pos = skip_same_name(ce, pos) - 1;
}
}
if (errs)
return 1;
/* Now we are committed to check them out */
memset(&state, 0, sizeof(state));
state.force = 1;
state.refresh_cache = 1;
for (pos = 0; pos < active_nr; pos++) {
struct cache_entry *ce = active_cache[pos];
if (opts->source_tree && !(ce->ce_flags & CE_UPDATE))
continue;
if (match_pathspec(opts->pathspec, ce->name, ce_namelen(ce), 0, NULL)) {
if (!ce_stage(ce)) {
errs |= checkout_entry(ce, &state, NULL);
continue;
}
if (stage)
errs |= checkout_stage(stage, ce, pos, &state);
else if (merge)
errs |= checkout_merged(pos, &state);
pos = skip_same_name(ce, pos) - 1;
}
}
if (write_cache(newfd, active_cache, active_nr) ||
commit_locked_index(lock_file))
die(_("unable to write new index file"));
read_ref_full("HEAD", rev, 0, &flag);
head = lookup_commit_reference_gently(rev, 1);
errs |= post_checkout_hook(head, head, 0);
return errs;
}
static void show_local_changes(struct object *head,
const struct diff_options *opts)
{
struct rev_info rev;
/* I think we want full paths, even if we're in a subdirectory. */
init_revisions(&rev, NULL);
rev.diffopt.flags = opts->flags;
rev.diffopt.output_format |= DIFF_FORMAT_NAME_STATUS;
diff_setup_done(&rev.diffopt);
add_pending_object(&rev, head, NULL);
run_diff_index(&rev, 0);
}
static void describe_detached_head(const char *msg, struct commit *commit)
{
struct strbuf sb = STRBUF_INIT;
parse_commit(commit);
pp_commit_easy(CMIT_FMT_ONELINE, commit, &sb);
fprintf(stderr, "%s %s... %s\n", msg,
find_unique_abbrev(commit->object.sha1, DEFAULT_ABBREV), sb.buf);
strbuf_release(&sb);
}
static int reset_tree(struct tree *tree, const struct checkout_opts *o,
int worktree, int *writeout_error)
{
struct unpack_trees_options opts;
struct tree_desc tree_desc;
memset(&opts, 0, sizeof(opts));
opts.head_idx = -1;
opts.update = worktree;
opts.skip_unmerged = !worktree;
opts.reset = 1;
opts.merge = 1;
opts.fn = oneway_merge;
opts.verbose_update = !o->quiet && isatty(2);
opts.src_index = &the_index;
opts.dst_index = &the_index;
parse_tree(tree);
init_tree_desc(&tree_desc, tree->buffer, tree->size);
switch (unpack_trees(1, &tree_desc, &opts)) {
case -2:
*writeout_error = 1;
/*
* We return 0 nevertheless, as the index is all right
* and more importantly we have made best efforts to
* update paths in the work tree, and we cannot revert
* them.
*/
case 0:
return 0;
default:
return 128;
}
}
struct branch_info {
const char *name; /* The short name used */
const char *path; /* The full name of a real branch */
struct commit *commit; /* The named commit */
};
static void setup_branch_path(struct branch_info *branch)
{
struct strbuf buf = STRBUF_INIT;
strbuf_branchname(&buf, branch->name);
if (strcmp(buf.buf, branch->name))
branch->name = xstrdup(buf.buf);
strbuf_splice(&buf, 0, 0, "refs/heads/", 11);
branch->path = strbuf_detach(&buf, NULL);
}
static int merge_working_tree(const struct checkout_opts *opts,
struct branch_info *old,
struct branch_info *new,
int *writeout_error)
{
int ret;
struct lock_file *lock_file = xcalloc(1, sizeof(struct lock_file));
int newfd = hold_locked_index(lock_file, 1);
if (read_cache_preload(NULL) < 0)
return error(_("corrupt index file"));
resolve_undo_clear();
if (opts->force) {
ret = reset_tree(new->commit->tree, opts, 1, writeout_error);
if (ret)
return ret;
} else {
struct tree_desc trees[2];
struct tree *tree;
struct unpack_trees_options topts;
memset(&topts, 0, sizeof(topts));
topts.head_idx = -1;
topts.src_index = &the_index;
topts.dst_index = &the_index;
setup_unpack_trees_porcelain(&topts, "checkout");
refresh_cache(REFRESH_QUIET);
if (unmerged_cache()) {
error(_("you need to resolve your current index first"));
return 1;
}
/* 2-way merge to the new branch */
topts.initial_checkout = is_cache_unborn();
topts.update = 1;
topts.merge = 1;
topts.gently = opts->merge && old->commit;
topts.verbose_update = !opts->quiet && isatty(2);
topts.fn = twoway_merge;
if (opts->overwrite_ignore) {
topts.dir = xcalloc(1, sizeof(*topts.dir));
topts.dir->flags |= DIR_SHOW_IGNORED;
setup_standard_excludes(topts.dir);
}
tree = parse_tree_indirect(old->commit ?
old->commit->object.sha1 :
EMPTY_TREE_SHA1_BIN);
init_tree_desc(&trees[0], tree->buffer, tree->size);
tree = parse_tree_indirect(new->commit->object.sha1);
init_tree_desc(&trees[1], tree->buffer, tree->size);
ret = unpack_trees(2, trees, &topts);
if (ret == -1) {
/*
* Unpack couldn't do a trivial merge; either
* give up or do a real merge, depending on
* whether the merge flag was used.
*/
struct tree *result;
struct tree *work;
struct merge_options o;
if (!opts->merge)
return 1;
/*
* Without old->commit, the below is the same as
* the two-tree unpack we already tried and failed.
*/
if (!old->commit)
return 1;
/* Do more real merge */
/*
* We update the index fully, then write the
* tree from the index, then merge the new
* branch with the current tree, with the old
* branch as the base. Then we reset the index
* (but not the working tree) to the new
* branch, leaving the working tree as the
* merged version, but skipping unmerged
* entries in the index.
*/
add_files_to_cache(NULL, NULL, 0);
/*
* NEEDSWORK: carrying over local changes
* when branches have different end-of-line
* normalization (or clean+smudge rules) is
* a pain; plumb in an option to set
* o.renormalize?
*/
init_merge_options(&o);
o.verbosity = 0;
work = write_tree_from_memory(&o);
ret = reset_tree(new->commit->tree, opts, 1,
writeout_error);
if (ret)
return ret;
o.ancestor = old->name;
o.branch1 = new->name;
o.branch2 = "local";
merge_trees(&o, new->commit->tree, work,
old->commit->tree, &result);
ret = reset_tree(new->commit->tree, opts, 0,
writeout_error);
if (ret)
return ret;
}
}
if (write_cache(newfd, active_cache, active_nr) ||
commit_locked_index(lock_file))
die(_("unable to write new index file"));
if (!opts->force && !opts->quiet)
show_local_changes(&new->commit->object, &opts->diff_options);
return 0;
}
static void report_tracking(struct branch_info *new)
{
struct strbuf sb = STRBUF_INIT;
struct branch *branch = branch_get(new->name);
if (!format_tracking_info(branch, &sb))
return;
fputs(sb.buf, stdout);
strbuf_release(&sb);
}
static void update_refs_for_switch(const struct checkout_opts *opts,
struct branch_info *old,
struct branch_info *new)
{
struct strbuf msg = STRBUF_INIT;
const char *old_desc;
if (opts->new_branch) {
if (opts->new_orphan_branch) {
if (opts->new_branch_log && !log_all_ref_updates) {
int temp;
char log_file[PATH_MAX];
char *ref_name = mkpath("refs/heads/%s", opts->new_orphan_branch);
temp = log_all_ref_updates;
log_all_ref_updates = 1;
if (log_ref_setup(ref_name, log_file, sizeof(log_file))) {
fprintf(stderr, _("Can not do reflog for '%s'\n"),
opts->new_orphan_branch);
log_all_ref_updates = temp;
return;
}
log_all_ref_updates = temp;
}
}
else
create_branch(old->name, opts->new_branch, new->name,
opts->new_branch_force ? 1 : 0,
opts->new_branch_log,
opts->new_branch_force ? 1 : 0,
opts->quiet,
opts->track);
new->name = opts->new_branch;
setup_branch_path(new);
}
old_desc = old->name;
if (!old_desc && old->commit)
old_desc = sha1_to_hex(old->commit->object.sha1);
strbuf_addf(&msg, "checkout: moving from %s to %s",
old_desc ? old_desc : "(invalid)", new->name);
if (!strcmp(new->name, "HEAD") && !new->path && !opts->force_detach) {
/* Nothing to do. */
} else if (opts->force_detach || !new->path) { /* No longer on any branch. */
update_ref(msg.buf, "HEAD", new->commit->object.sha1, NULL,
REF_NODEREF, DIE_ON_ERR);
if (!opts->quiet) {
if (old->path && advice_detached_head)
detach_advice(new->name);
describe_detached_head(_("HEAD is now at"), new->commit);
}
} else if (new->path) { /* Switch branches. */
create_symref("HEAD", new->path, msg.buf);
if (!opts->quiet) {
if (old->path && !strcmp(new->path, old->path)) {
if (opts->new_branch_force)
fprintf(stderr, _("Reset branch '%s'\n"),
new->name);
else
fprintf(stderr, _("Already on '%s'\n"),
new->name);
} else if (opts->new_branch) {
if (opts->branch_exists)
fprintf(stderr, _("Switched to and reset branch '%s'\n"), new->name);
else
fprintf(stderr, _("Switched to a new branch '%s'\n"), new->name);
} else {
fprintf(stderr, _("Switched to branch '%s'\n"),
new->name);
}
}
if (old->path && old->name) {
char log_file[PATH_MAX], ref_file[PATH_MAX];
git_snpath(log_file, sizeof(log_file), "logs/%s", old->path);
git_snpath(ref_file, sizeof(ref_file), "%s", old->path);
if (!file_exists(ref_file) && file_exists(log_file))
remove_path(log_file);
}
}
remove_branch_state();
strbuf_release(&msg);
if (!opts->quiet &&
(new->path || (!opts->force_detach && !strcmp(new->name, "HEAD"))))
report_tracking(new);
}
static int add_pending_uninteresting_ref(const char *refname,
const unsigned char *sha1,
int flags, void *cb_data)
{
add_pending_sha1(cb_data, refname, sha1, UNINTERESTING);
return 0;
}
static void describe_one_orphan(struct strbuf *sb, struct commit *commit)
{
parse_commit(commit);
strbuf_addstr(sb, " ");
strbuf_addstr(sb,
find_unique_abbrev(commit->object.sha1, DEFAULT_ABBREV));
strbuf_addch(sb, ' ');
pp_commit_easy(CMIT_FMT_ONELINE, commit, sb);
strbuf_addch(sb, '\n');
}
#define ORPHAN_CUTOFF 4
static void suggest_reattach(struct commit *commit, struct rev_info *revs)
{
struct commit *c, *last = NULL;
struct strbuf sb = STRBUF_INIT;
int lost = 0;
while ((c = get_revision(revs)) != NULL) {
if (lost < ORPHAN_CUTOFF)
describe_one_orphan(&sb, c);
last = c;
lost++;
}
if (ORPHAN_CUTOFF < lost) {
int more = lost - ORPHAN_CUTOFF;
if (more == 1)
describe_one_orphan(&sb, last);
else
strbuf_addf(&sb, _(" ... and %d more.\n"), more);
}
fprintf(stderr,
Q_(
/* The singular version */
"Warning: you are leaving %d commit behind, "
"not connected to\n"
"any of your branches:\n\n"
"%s\n",
/* The plural version */
"Warning: you are leaving %d commits behind, "
"not connected to\n"
"any of your branches:\n\n"
"%s\n",
/* Give ngettext() the count */
lost),
lost,
sb.buf);
strbuf_release(&sb);
if (advice_detached_head)
fprintf(stderr,
_(
"If you want to keep them by creating a new branch, "
"this may be a good time\nto do so with:\n\n"
" git branch new_branch_name %s\n\n"),
sha1_to_hex(commit->object.sha1));
}
/*
* We are about to leave commit that was at the tip of a detached
* HEAD. If it is not reachable from any ref, this is the last chance
* for the user to do so without resorting to reflog.
*/
static void orphaned_commit_warning(struct commit *old, struct commit *new)
{
struct rev_info revs;
struct object *object = &old->object;
struct object_array refs;
init_revisions(&revs, NULL);
setup_revisions(0, NULL, &revs, NULL);
object->flags &= ~UNINTERESTING;
add_pending_object(&revs, object, sha1_to_hex(object->sha1));
for_each_ref(add_pending_uninteresting_ref, &revs);
add_pending_sha1(&revs, "HEAD", new->object.sha1, UNINTERESTING);
refs = revs.pending;
revs.leak_pending = 1;
if (prepare_revision_walk(&revs))
die(_("internal error in revision walk"));
if (!(old->object.flags & UNINTERESTING))
suggest_reattach(old, &revs);
else
describe_detached_head(_("Previous HEAD position was"), old);
clear_commit_marks_for_object_array(&refs, ALL_REV_FLAGS);
free(refs.objects);
}
static int switch_branches(const struct checkout_opts *opts,
struct branch_info *new)
{
int ret = 0;
struct branch_info old;
void *path_to_free;
unsigned char rev[20];
int flag, writeout_error = 0;
memset(&old, 0, sizeof(old));
old.path = path_to_free = resolve_refdup("HEAD", rev, 0, &flag);
old.commit = lookup_commit_reference_gently(rev, 1);
if (!(flag & REF_ISSYMREF))
old.path = NULL;
if (old.path && !prefixcmp(old.path, "refs/heads/"))
old.name = old.path + strlen("refs/heads/");
if (!new->name) {
new->name = "HEAD";
new->commit = old.commit;
if (!new->commit)
die(_("You are on a branch yet to be born"));
parse_commit(new->commit);
}
ret = merge_working_tree(opts, &old, new, &writeout_error);
if (ret) {
free(path_to_free);
return ret;
}
if (!opts->quiet && !old.path && old.commit && new->commit != old.commit)
orphaned_commit_warning(old.commit, new->commit);
update_refs_for_switch(opts, &old, new);
ret = post_checkout_hook(old.commit, new->commit, 1);
free(path_to_free);
return ret || writeout_error;
}
static int git_checkout_config(const char *var, const char *value, void *cb)
{
if (!strcmp(var, "diff.ignoresubmodules")) {
struct checkout_opts *opts = cb;
handle_ignore_submodules_arg(&opts->diff_options, value);
return 0;
}
if (!prefixcmp(var, "submodule."))
return parse_submodule_config_option(var, value);
return git_xmerge_config(var, value, NULL);
}
struct tracking_name_data {
const char *name;
char *remote;
int unique;
};
static int check_tracking_name(const char *refname, const unsigned char *sha1,
int flags, void *cb_data)
{
struct tracking_name_data *cb = cb_data;
const char *slash;
if (prefixcmp(refname, "refs/remotes/"))
return 0;
slash = strchr(refname + 13, '/');
if (!slash || strcmp(slash + 1, cb->name))
return 0;
if (cb->remote) {
cb->unique = 0;
return 0;
}
cb->remote = xstrdup(refname);
return 0;
}
static const char *unique_tracking_name(const char *name)
{
struct tracking_name_data cb_data = { NULL, NULL, 1 };
cb_data.name = name;
for_each_ref(check_tracking_name, &cb_data);
if (cb_data.unique)
return cb_data.remote;
free(cb_data.remote);
return NULL;
}
static int parse_branchname_arg(int argc, const char **argv,
int dwim_new_local_branch_ok,
struct branch_info *new,
struct tree **source_tree,
unsigned char rev[20],
const char **new_branch)
{
int argcount = 0;
unsigned char branch_rev[20];
const char *arg;
int has_dash_dash;
/*
* case 1: git checkout <ref> -- [<paths>]
*
* <ref> must be a valid tree, everything after the '--' must be
* a path.
*
* case 2: git checkout -- [<paths>]
*
* everything after the '--' must be paths.
*
* case 3: git checkout <something> [<paths>]
*
* With no paths, if <something> is a commit, that is to
* switch to the branch or detach HEAD at it. As a special case,
* if <something> is A...B (missing A or B means HEAD but you can
* omit at most one side), and if there is a unique merge base
* between A and B, A...B names that merge base.
*
* With no paths, if <something> is _not_ a commit, no -t nor -b
* was given, and there is a tracking branch whose name is
* <something> in one and only one remote, then this is a short-hand
* to fork local <something> from that remote-tracking branch.
*
* Otherwise <something> shall not be ambiguous.
* - If it's *only* a reference, treat it like case (1).
* - If it's only a path, treat it like case (2).
* - else: fail.
*
*/
if (!argc)
return 0;
if (!strcmp(argv[0], "--")) /* case (2) */
return 1;
arg = argv[0];
has_dash_dash = (argc > 1) && !strcmp(argv[1], "--");
if (!strcmp(arg, "-"))
arg = "@{-1}";
if (get_sha1_mb(arg, rev)) {
if (has_dash_dash) /* case (1) */
die(_("invalid reference: %s"), arg);
if (dwim_new_local_branch_ok &&
!check_filename(NULL, arg) &&
argc == 1) {
const char *remote = unique_tracking_name(arg);
if (!remote || get_sha1(remote, rev))
return argcount;
*new_branch = arg;
arg = remote;
/* DWIMmed to create local branch */
} else {
return argcount;
}
}
/* we can't end up being in (2) anymore, eat the argument */
argcount++;
argv++;
argc--;
new->name = arg;
setup_branch_path(new);
if (!check_refname_format(new->path, 0) &&
!read_ref(new->path, branch_rev))
hashcpy(rev, branch_rev);
else
new->path = NULL; /* not an existing branch */
new->commit = lookup_commit_reference_gently(rev, 1);
if (!new->commit) {
/* not a commit */
*source_tree = parse_tree_indirect(rev);
} else {
parse_commit(new->commit);
*source_tree = new->commit->tree;
}
if (!*source_tree) /* case (1): want a tree */
die(_("reference is not a tree: %s"), arg);
if (!has_dash_dash) {/* case (3 -> 1) */
/*
* Do not complain the most common case
* git checkout branch
* even if there happen to be a file called 'branch';
* it would be extremely annoying.
*/
if (argc)
verify_non_filename(NULL, arg);
} else {
argcount++;
argv++;
argc--;
}
return argcount;
}
static int switch_unborn_to_new_branch(const struct checkout_opts *opts)
{
int status;
struct strbuf branch_ref = STRBUF_INIT;
if (!opts->new_branch)
die(_("You are on a branch yet to be born"));
strbuf_addf(&branch_ref, "refs/heads/%s", opts->new_branch);
status = create_symref("HEAD", branch_ref.buf, "checkout -b");
strbuf_release(&branch_ref);
return status;
}
static int checkout_branch(struct checkout_opts *opts,
struct branch_info *new)
{
if (opts->pathspec)
die(_("paths cannot be used with switching branches"));
if (opts->patch_mode)
die(_("'%s' cannot be used with switching branches"),
"--patch");
if (opts->writeout_stage)
die(_("'%s' cannot be used with switching branches"),
"--ours/--theirs");
if (opts->force && opts->merge)
die(_("'%s' cannot be used with '%s'"), "-f", "-m");
if (opts->force_detach && opts->new_branch)
die(_("'%s' cannot be used with '%s'"),
"--detach", "-b/-B/--orphan");
if (opts->new_orphan_branch) {
if (opts->track != BRANCH_TRACK_UNSPECIFIED)
die(_("'%s' cannot be used with '%s'"), "--orphan", "-t");
} else if (opts->force_detach) {
if (opts->track != BRANCH_TRACK_UNSPECIFIED)
die(_("'%s' cannot be used with '%s'"), "--detach", "-t");
} else if (opts->track == BRANCH_TRACK_UNSPECIFIED)
opts->track = git_branch_track;
if (new->name && !new->commit)
die(_("Cannot switch branch to a non-commit '%s'"),
new->name);
if (!new->commit && opts->new_branch) {
unsigned char rev[20];
int flag;
if (!read_ref_full("HEAD", rev, 0, &flag) &&
(flag & REF_ISSYMREF) && is_null_sha1(rev))
return switch_unborn_to_new_branch(opts);
}
return switch_branches(opts, new);
}