}
static int update_some(const unsigned char *sha1, const char *base, int baselen,
- const char *pathname, unsigned mode, int stage)
+ const char *pathname, unsigned mode, int stage, void *context)
{
int len;
struct cache_entry *ce;
static int read_tree_some(struct tree *tree, const char **pathspec)
{
- read_tree_recursive(tree, "", 0, 0, pathspec, update_some);
+ read_tree_recursive(tree, "", 0, 0, pathspec, update_some, NULL);
/* update the index with the given tree's info
* for all args, expanding wildcards, and exit
strbuf_release(&sb);
}
-static int reset_to_new(struct tree *tree, int quiet)
-{
- struct unpack_trees_options opts;
- struct tree_desc tree_desc;
+struct checkout_opts {
+ int quiet;
+ int merge;
+ int force;
+ int writeout_error;
- memset(&opts, 0, sizeof(opts));
- opts.head_idx = -1;
- opts.update = 1;
- opts.reset = 1;
- opts.merge = 1;
- opts.fn = oneway_merge;
- opts.verbose_update = !quiet;
- opts.src_index = &the_index;
- opts.dst_index = &the_index;
- parse_tree(tree);
- init_tree_desc(&tree_desc, tree->buffer, tree->size);
- if (unpack_trees(1, &tree_desc, &opts))
- return 128;
- return 0;
-}
+ char *new_branch;
+ int new_branch_log;
+ enum branch_track track;
+};
-static int reset_clean_to_new(struct tree *tree, int quiet)
+static int reset_tree(struct tree *tree, struct checkout_opts *o, int worktree)
{
struct unpack_trees_options opts;
struct tree_desc tree_desc;
memset(&opts, 0, sizeof(opts));
opts.head_idx = -1;
- opts.skip_unmerged = 1;
+ opts.update = worktree;
+ opts.skip_unmerged = !worktree;
opts.reset = 1;
opts.merge = 1;
opts.fn = oneway_merge;
- opts.verbose_update = !quiet;
+ opts.verbose_update = !o->quiet;
opts.src_index = &the_index;
opts.dst_index = &the_index;
parse_tree(tree);
init_tree_desc(&tree_desc, tree->buffer, tree->size);
- if (unpack_trees(1, &tree_desc, &opts))
+ switch (unpack_trees(1, &tree_desc, &opts)) {
+ case -2:
+ o->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;
- return 0;
+ }
}
-struct checkout_opts {
- int quiet;
- int merge;
- int force;
-
- char *new_branch;
- int new_branch_log;
- enum branch_track track;
-};
-
struct branch_info {
const char *name; /* The short name used */
const char *path; /* The full name of a real branch */
read_cache();
if (opts->force) {
- ret = reset_to_new(new->commit->tree, opts->quiet);
+ ret = reset_tree(new->commit->tree, opts, 1);
if (ret)
return ret;
} else {
tree = parse_tree_indirect(new->commit->object.sha1);
init_tree_desc(&trees[1], tree->buffer, tree->size);
- if (unpack_trees(2, trees, &topts)) {
+ 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
add_files_to_cache(NULL, NULL, 0);
work = write_tree_from_memory();
- ret = reset_to_new(new->commit->tree, opts->quiet);
+ ret = reset_tree(new->commit->tree, opts, 1);
if (ret)
return ret;
merge_trees(new->commit->tree, work, old->commit->tree,
new->name, "local", &result);
- ret = reset_clean_to_new(new->commit->tree, opts->quiet);
+ ret = reset_tree(new->commit->tree, opts, 0);
if (ret)
return ret;
}
return 0;
}
-static void report_tracking(struct branch_info *new, struct checkout_opts *opts)
+static void report_tracking(struct branch_info *new)
{
- /*
- * We have switched to a new branch; is it building on
- * top of another branch, and if so does that other branch
- * have changes we do not have yet?
- */
- char *base;
- unsigned char sha1[20];
- struct commit *ours, *theirs;
- char symmetric[84];
- struct rev_info revs;
- const char *rev_argv[10];
- int rev_argc;
- int num_ours, num_theirs;
- const char *remote_msg;
+ struct strbuf sb = STRBUF_INIT;
struct branch *branch = branch_get(new->name);
- /*
- * Nothing to report unless we are marked to build on top of
- * somebody else.
- */
- if (!branch || !branch->merge || !branch->merge[0] || !branch->merge[0]->dst)
- return;
-
- /*
- * If what we used to build on no longer exists, there is
- * nothing to report.
- */
- base = branch->merge[0]->dst;
- if (!resolve_ref(base, sha1, 1, NULL))
+ if (!format_tracking_info(branch, &sb))
return;
-
- theirs = lookup_commit(sha1);
- ours = new->commit;
- if (!hashcmp(sha1, ours->object.sha1))
- return; /* we are the same */
-
- /* Run "rev-list --left-right ours...theirs" internally... */
- rev_argc = 0;
- rev_argv[rev_argc++] = NULL;
- rev_argv[rev_argc++] = "--left-right";
- rev_argv[rev_argc++] = symmetric;
- rev_argv[rev_argc++] = "--";
- rev_argv[rev_argc] = NULL;
-
- strcpy(symmetric, sha1_to_hex(ours->object.sha1));
- strcpy(symmetric + 40, "...");
- strcpy(symmetric + 43, sha1_to_hex(theirs->object.sha1));
-
- init_revisions(&revs, NULL);
- setup_revisions(rev_argc, rev_argv, &revs, NULL);
- prepare_revision_walk(&revs);
-
- /* ... and count the commits on each side. */
- num_ours = 0;
- num_theirs = 0;
- while (1) {
- struct commit *c = get_revision(&revs);
- if (!c)
- break;
- if (c->object.flags & SYMMETRIC_LEFT)
- num_ours++;
- else
- num_theirs++;
- }
-
- if (!prefixcmp(base, "refs/remotes/")) {
- remote_msg = " remote";
- base += strlen("refs/remotes/");
- } else {
- remote_msg = "";
- }
-
- if (!num_theirs)
- printf("Your branch is ahead of the tracked%s branch '%s' "
- "by %d commit%s.\n",
- remote_msg, base,
- num_ours, (num_ours == 1) ? "" : "s");
- else if (!num_ours)
- printf("Your branch is behind the tracked%s branch '%s' "
- "by %d commit%s,\n"
- "and can be fast-forwarded.\n",
- remote_msg, base,
- num_theirs, (num_theirs == 1) ? "" : "s");
- else
- printf("Your branch and the tracked%s branch '%s' "
- "have diverged,\nand respectively "
- "have %d and %d different commit(s) each.\n",
- remote_msg, base,
- num_ours, num_theirs);
+ fputs(sb.buf, stdout);
+ strbuf_release(&sb);
}
static void update_refs_for_switch(struct checkout_opts *opts,
remove_branch_state();
strbuf_release(&msg);
if (!opts->quiet && (new->path || !strcmp(new->name, "HEAD")))
- report_tracking(new, opts);
+ report_tracking(new);
}
static int switch_branches(struct checkout_opts *opts, struct branch_info *new)
update_refs_for_switch(opts, &old, new);
- return post_checkout_hook(old.commit, new->commit, 1);
+ ret = post_checkout_hook(old.commit, new->commit, 1);
+ return ret || opts->writeout_error;
}
int cmd_checkout(int argc, const char **argv, const char *prefix)
OPT_BOOLEAN('m', NULL, &opts.merge, "merge"),
OPT_END(),
};
+ int has_dash_dash;
memset(&opts, 0, sizeof(opts));
memset(&new, 0, sizeof(new));
opts.track = git_branch_track;
- argc = parse_options(argc, argv, options, checkout_usage, 0);
+ argc = parse_options(argc, argv, options, checkout_usage,
+ PARSE_OPT_KEEP_DASHDASH);
+
+ if (!opts.new_branch && (opts.track != git_branch_track))
+ die("git checkout: --track and --no-track require -b");
+
+ if (opts.force && opts.merge)
+ die("git checkout: -f and -m are incompatible");
+
+ /*
+ * 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.
+ *
+ * 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) {
+ if (!strcmp(argv[0], "--")) { /* case (2) */
+ argv++;
+ argc--;
+ goto no_reference;
+ }
+
arg = argv[0];
- if (get_sha1(arg, rev))
- ;
- else if ((new.commit = lookup_commit_reference_gently(rev, 1))) {
+ has_dash_dash = (argc > 1) && !strcmp(argv[1], "--");
+
+ if (get_sha1(arg, rev)) {
+ if (has_dash_dash) /* case (1) */
+ die("invalid reference: %s", arg);
+ goto no_reference; /* case (3 -> 2) */
+ }
+
+ /* we can't end up being in (2) anymore, eat the argument */
+ argv++;
+ argc--;
+
+ if ((new.commit = lookup_commit_reference_gently(rev, 1))) {
new.name = arg;
setup_branch_path(&new);
if (resolve_ref(new.path, rev, 1, NULL))
new.path = NULL;
parse_commit(new.commit);
source_tree = new.commit->tree;
- argv++;
- argc--;
- } else if ((source_tree = parse_tree_indirect(rev))) {
+ } else
+ source_tree = parse_tree_indirect(rev);
+
+ 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 {
argv++;
argc--;
}
}
- if (argc && !strcmp(argv[0], "--")) {
- argv++;
- argc--;
- }
-
- if (!opts.new_branch && (opts.track != git_branch_track))
- die("git checkout: --track and --no-track require -b");
-
- if (opts.force && opts.merge)
- die("git checkout: -f and -m are incompatible");
-
+no_reference:
if (argc) {
const char **pathspec = get_pathspec(prefix, argv);