#include "resolve-undo.h"
#include "submodule-config.h"
#include "submodule.h"
+#include "advice.h"
+
+static int checkout_optimize_new_branch;
static const char * const checkout_usage[] = {
N_("git checkout [<options>] <branch>"),
int ignore_skipworktree;
int ignore_other_worktrees;
int show_progress;
+ /*
+ * If new checkout options are added, skip_merge_working_tree
+ * should be updated accordingly.
+ */
const char *new_branch;
const char *new_branch_force;
return READ_TREE_RECURSIVE;
len = base->len + strlen(pathname);
- ce = xcalloc(1, cache_entry_size(len));
+ ce = make_empty_cache_entry(&the_index, len);
oidcpy(&ce->oid, oid);
memcpy(ce->name, base->buf, base->len);
memcpy(ce->name + base->len, pathname, len - base->len);
if (pos >= 0) {
struct cache_entry *old = active_cache[pos];
if (ce->ce_mode == old->ce_mode &&
- !oidcmp(&ce->oid, &old->oid)) {
+ oideq(&ce->oid, &old->oid)) {
old->ce_flags |= CE_UPDATE;
- free(ce);
+ discard_cache_entry(ce);
return 0;
}
}
* merge.renormalize set, too
*/
status = ll_merge(&result_buf, path, &ancestor, "base",
- &ours, "ours", &theirs, "theirs", NULL);
+ &ours, "ours", &theirs, "theirs",
+ state->istate, NULL);
free(ancestor.ptr);
free(ours.ptr);
free(theirs.ptr);
if (write_object_file(result_buf.ptr, result_buf.size, blob_type, &oid))
die(_("Unable to add merge result for '%s'"), path);
free(result_buf.ptr);
- ce = make_cache_entry(mode, oid.hash, path, 2, 0);
+ ce = make_transient_cache_entry(mode, &oid, path, 2);
if (!ce)
die(_("make_cache_entry failed for path '%s'"), path);
status = checkout_entry(ce, state, NULL);
- free(ce);
+ discard_cache_entry(ce);
return status;
}
* match_pathspec() for _all_ entries when
* opts->source_tree != NULL.
*/
- if (ce_path_match(ce, &opts->pathspec, ps_matched))
+ if (ce_path_match(&the_index, ce, &opts->pathspec, ps_matched))
ce->ce_flags |= CE_MATCHED;
}
die(_("unable to write new index file"));
read_ref_full("HEAD", 0, &rev, NULL);
- head = lookup_commit_reference_gently(&rev, 1);
+ head = lookup_commit_reference_gently(the_repository, &rev, 1);
errs |= post_checkout_hook(head, head, 0);
return errs;
{
struct rev_info rev;
/* I think we want full paths, even if we're in a subdirectory. */
- init_revisions(&rev, NULL);
+ repo_init_revisions(the_repository, &rev, NULL);
rev.diffopt.flags = opts->flags;
rev.diffopt.output_format |= DIFF_FORMAT_NAME_STATUS;
diff_setup_done(&rev.diffopt);
branch->path = strbuf_detach(&buf, NULL);
}
+/*
+ * Skip merging the trees, updating the index and working directory if and
+ * only if we are creating a new branch via "git checkout -b <new_branch>."
+ */
+static int skip_merge_working_tree(const struct checkout_opts *opts,
+ const struct branch_info *old_branch_info,
+ const struct branch_info *new_branch_info)
+{
+ /*
+ * Do the merge if sparse checkout is on and the user has not opted in
+ * to the optimized behavior
+ */
+ if (core_apply_sparse_checkout && !checkout_optimize_new_branch)
+ return 0;
+
+ /*
+ * We must do the merge if we are actually moving to a new commit.
+ */
+ if (!old_branch_info->commit || !new_branch_info->commit ||
+ !oideq(&old_branch_info->commit->object.oid,
+ &new_branch_info->commit->object.oid))
+ return 0;
+
+ /*
+ * opts->patch_mode cannot be used with switching branches so is
+ * not tested here
+ */
+
+ /*
+ * opts->quiet only impacts output so doesn't require a merge
+ */
+
+ /*
+ * Honor the explicit request for a three-way merge or to throw away
+ * local changes
+ */
+ if (opts->merge || opts->force)
+ return 0;
+
+ /*
+ * --detach is documented as "updating the index and the files in the
+ * working tree" but this optimization skips those steps so fall through
+ * to the regular code path.
+ */
+ if (opts->force_detach)
+ return 0;
+
+ /*
+ * opts->writeout_stage cannot be used with switching branches so is
+ * not tested here
+ */
+
+ /*
+ * Honor the explicit ignore requests
+ */
+ if (!opts->overwrite_ignore || opts->ignore_skipworktree ||
+ opts->ignore_other_worktrees)
+ return 0;
+
+ /*
+ * opts->show_progress only impacts output so doesn't require a merge
+ */
+
+ /*
+ * If we aren't creating a new branch any changes or updates will
+ * happen in the existing branch. Since that could only be updating
+ * the index and working directory, we don't want to skip those steps
+ * or we've defeated any purpose in running the command.
+ */
+ if (!opts->new_branch)
+ return 0;
+
+ /*
+ * new_branch_force is defined to "create/reset and checkout a branch"
+ * so needs to go through the merge to do the reset
+ */
+ if (opts->new_branch_force)
+ return 0;
+
+ /*
+ * A new orphaned branch requrires the index and the working tree to be
+ * adjusted to <start_point>
+ */
+ if (opts->new_orphan_branch)
+ return 0;
+
+ /*
+ * Remaining variables are not checkout options but used to track state
+ */
+
+ return 1;
+}
+
static int merge_working_tree(const struct checkout_opts *opts,
struct branch_info *old_branch_info,
struct branch_info *new_branch_info,
struct rev_info revs;
struct object *object = &old_commit->object;
- init_revisions(&revs, NULL);
+ repo_init_revisions(the_repository, &revs, NULL);
setup_revisions(0, NULL, &revs, NULL);
object->flags &= ~UNINTERESTING;
memset(&old_branch_info, 0, sizeof(old_branch_info));
old_branch_info.path = path_to_free = resolve_refdup("HEAD", 0, &rev, &flag);
if (old_branch_info.path)
- old_branch_info.commit = lookup_commit_reference_gently(&rev, 1);
+ old_branch_info.commit = lookup_commit_reference_gently(the_repository, &rev, 1);
if (!(flag & REF_ISSYMREF))
old_branch_info.path = NULL;
parse_commit_or_die(new_branch_info->commit);
}
- ret = merge_working_tree(opts, &old_branch_info, new_branch_info, &writeout_error);
- if (ret) {
- free(path_to_free);
- return ret;
+ /* optimize the "checkout -b <new_branch> path */
+ if (skip_merge_working_tree(opts, &old_branch_info, new_branch_info)) {
+ if (!checkout_optimize_new_branch && !opts->quiet) {
+ if (read_cache_preload(NULL) < 0)
+ return error(_("index file corrupt"));
+ show_local_changes(&new_branch_info->commit->object, &opts->diff_options);
+ }
+ } else {
+ ret = merge_working_tree(opts, &old_branch_info, new_branch_info, &writeout_error);
+ if (ret) {
+ free(path_to_free);
+ return ret;
+ }
}
if (!opts->quiet && !old_branch_info.path && old_branch_info.commit && new_branch_info->commit != old_branch_info.commit)
static int git_checkout_config(const char *var, const char *value, void *cb)
{
+ if (!strcmp(var, "checkout.optimizenewbranch")) {
+ checkout_optimize_new_branch = git_config_bool(var, value);
+ return 0;
+ }
+
if (!strcmp(var, "diff.ignoresubmodules")) {
struct checkout_opts *opts = cb;
handle_ignore_submodules_arg(&opts->diff_options, value);
int dwim_new_local_branch_ok,
struct branch_info *new_branch_info,
struct checkout_opts *opts,
- struct object_id *rev)
+ struct object_id *rev,
+ int *dwim_remotes_matched)
{
struct tree **source_tree = &opts->source_tree;
const char **new_branch = &opts->new_branch;
* (b) If <something> is _not_ a commit, either "--" is present
* or <something> is not a path, no -t or -b was given, and
* 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.
+ * in one and only one remote (or if the branch exists on the
+ * remote named in checkout.defaultRemote), then this is a
+ * short-hand to fork local <something> from that
+ * remote-tracking branch.
*
* (c) Otherwise, if "--" is present, treat it like case (1).
*
recover_with_dwim = 0;
if (recover_with_dwim) {
- const char *remote = unique_tracking_name(arg, rev);
+ const char *remote = unique_tracking_name(arg, rev,
+ dwim_remotes_matched);
if (remote) {
*new_branch = arg;
arg = remote;
else
new_branch_info->path = NULL; /* not an existing branch */
- new_branch_info->commit = lookup_commit_reference_gently(rev, 1);
+ new_branch_info->commit = lookup_commit_reference_gently(the_repository, rev, 1);
if (!new_branch_info->commit) {
/* not a commit */
*source_tree = parse_tree_indirect(rev);
struct branch_info new_branch_info;
char *conflict_style = NULL;
int dwim_new_local_branch = 1;
+ int dwim_remotes_matched = 0;
struct option options[] = {
OPT__QUIET(&opts.quiet, N_("suppress progress reporting")),
OPT_STRING('b', NULL, &opts.new_branch, N_("branch"),
if (opts.track != BRANCH_TRACK_UNSPECIFIED && !opts.new_branch) {
const char *argv0 = argv[0];
if (!argc || !strcmp(argv0, "--"))
- die (_("--track needs a branch name"));
+ die(_("--track needs a branch name"));
skip_prefix(argv0, "refs/", &argv0);
skip_prefix(argv0, "remotes/", &argv0);
argv0 = strchr(argv0, '/');
if (!argv0 || !argv0[1])
- die (_("Missing branch name; try -b"));
+ die(_("missing branch name; try -b"));
opts.new_branch = argv0 + 1;
}
opts.track == BRANCH_TRACK_UNSPECIFIED &&
!opts.new_branch;
int n = parse_branchname_arg(argc, argv, dwim_ok,
- &new_branch_info, &opts, &rev);
+ &new_branch_info, &opts, &rev,
+ &dwim_remotes_matched);
argv += n;
argc -= n;
}
}
UNLEAK(opts);
- if (opts.patch_mode || opts.pathspec.nr)
- return checkout_paths(&opts, new_branch_info.name);
- else
+ if (opts.patch_mode || opts.pathspec.nr) {
+ int ret = checkout_paths(&opts, new_branch_info.name);
+ if (ret && dwim_remotes_matched > 1 &&
+ advice_checkout_ambiguous_remote_branch_name)
+ advise(_("'%s' matched more than one remote tracking branch.\n"
+ "We found %d remotes with a reference that matched. So we fell back\n"
+ "on trying to resolve the argument as a path, but failed there too!\n"
+ "\n"
+ "If you meant to check out a remote tracking branch on, e.g. 'origin',\n"
+ "you can do so by fully qualifying the name with the --track option:\n"
+ "\n"
+ " git checkout --track origin/<name>\n"
+ "\n"
+ "If you'd like to always have checkouts of an ambiguous <name> prefer\n"
+ "one remote, e.g. the 'origin' remote, consider setting\n"
+ "checkout.defaultRemote=origin in your config."),
+ argv[0],
+ dwim_remotes_matched);
+ return ret;
+ } else {
return checkout_branch(&opts, &new_branch_info);
+ }
}