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-rw-r--r--builtin-checkout.c107
1 files changed, 96 insertions, 11 deletions
diff --git a/builtin-checkout.c b/builtin-checkout.c
index f2786fe43..c5ab7835e 100644
--- a/builtin-checkout.c
+++ b/builtin-checkout.c
@@ -17,6 +17,7 @@
#include "blob.h"
#include "xdiff-interface.h"
#include "ll-merge.h"
+#include "resolve-undo.h"
static const char * const checkout_usage[] = {
"git checkout [options] <branch>",
@@ -167,7 +168,7 @@ static int checkout_merged(int pos, struct checkout *state)
fill_mm(active_cache[pos+2]->sha1, &theirs);
status = ll_merge(&result_buf, path, &ancestor,
- &ours, "ours", &theirs, "theirs", 1);
+ &ours, "ours", &theirs, "theirs", 0);
free(ancestor.ptr);
free(ours.ptr);
free(theirs.ptr);
@@ -234,6 +235,10 @@ static int checkout_paths(struct tree *source_tree, const char **pathspec,
if (report_path_error(ps_matched, pathspec, 0))
return 1;
+ /* "checkout -m path" to recreate conflicted state */
+ if (opts->merge)
+ unmerge_cache(pathspec);
+
/* Any unmerged paths? */
for (pos = 0; pos < active_nr; pos++) {
struct cache_entry *ce = active_cache[pos];
@@ -302,8 +307,9 @@ static void show_local_changes(struct object *head)
static void describe_detached_head(char *msg, struct commit *commit)
{
struct strbuf sb = STRBUF_INIT;
+ struct pretty_print_context ctx = {0};
parse_commit(commit);
- pretty_print_commit(CMIT_FMT_ONELINE, commit, &sb, 0, NULL, NULL, 0, 0);
+ pretty_print_commit(CMIT_FMT_ONELINE, commit, &sb, &ctx);
fprintf(stderr, "%s %s... %s\n", msg,
find_unique_abbrev(commit->object.sha1, DEFAULT_ABBREV), sb.buf);
strbuf_release(&sb);
@@ -369,6 +375,7 @@ static int merge_working_tree(struct checkout_opts *opts,
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);
if (ret)
@@ -481,6 +488,20 @@ static void report_tracking(struct branch_info *new)
strbuf_release(&sb);
}
+static void detach_advice(const char *old_path, const char *new_name)
+{
+ const char fmt[] =
+ "Note: checking out '%s'.\n\n"
+ "You are in 'detached HEAD' state. You can look around, make experimental\n"
+ "changes and commit them, and you can discard any commits you make in this\n"
+ "state without impacting any branches by performing another checkout.\n\n"
+ "If you want to create a new branch to retain commits you create, you may\n"
+ "do so (now or later) by using -b with the checkout command again. Example:\n\n"
+ " git checkout -b new_branch_name\n\n";
+
+ fprintf(stderr, fmt, new_name);
+}
+
static void update_refs_for_switch(struct checkout_opts *opts,
struct branch_info *old,
struct branch_info *new)
@@ -515,8 +536,8 @@ static void update_refs_for_switch(struct checkout_opts *opts,
update_ref(msg.buf, "HEAD", new->commit->object.sha1, NULL,
REF_NODEREF, DIE_ON_ERR);
if (!opts->quiet) {
- if (old->path)
- fprintf(stderr, "Note: moving to '%s' which isn't a local branch\nIf you want to create a new branch from this checkout, you may do so\n(now or later) by using -b with the checkout command again. Example:\n git checkout -b <new_branch_name>\n", new->name);
+ if (old->path && advice_detached_head)
+ detach_advice(old->path, new->name);
describe_detached_head("HEAD is now at", new->commit);
}
}
@@ -578,6 +599,40 @@ static int interactive_checkout(const char *revision, const char **pathspec,
return run_add_interactive(revision, "--patch=checkout", pathspec);
}
+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 = { name, NULL, 1 };
+ for_each_ref(check_tracking_name, &cb_data);
+ if (cb_data.unique)
+ return cb_data.remote;
+ free(cb_data.remote);
+ return NULL;
+}
int cmd_checkout(int argc, const char **argv, const char *prefix)
{
@@ -588,6 +643,7 @@ int cmd_checkout(int argc, const char **argv, const char *prefix)
struct tree *source_tree = NULL;
char *conflict_style = NULL;
int patch_mode = 0;
+ int dwim_new_local_branch = 1;
struct option options[] = {
OPT__QUIET(&opts.quiet),
OPT_STRING('b', NULL, &opts.new_branch, "new branch", "branch"),
@@ -603,6 +659,9 @@ int cmd_checkout(int argc, const char **argv, const char *prefix)
OPT_STRING(0, "conflict", &conflict_style, "style",
"conflict style (merge or diff3)"),
OPT_BOOLEAN('p', "patch", &patch_mode, "select hunks interactively"),
+ { OPTION_BOOLEAN, 0, "guess", &dwim_new_local_branch, NULL,
+ "second guess 'git checkout no-such-branch'",
+ PARSE_OPT_NOARG | PARSE_OPT_HIDDEN },
OPT_END(),
};
int has_dash_dash;
@@ -636,8 +695,6 @@ int cmd_checkout(int argc, const char **argv, const char *prefix)
opts.new_branch = argv0 + 1;
}
- if (opts.track == BRANCH_TRACK_UNSPECIFIED)
- opts.track = git_branch_track;
if (conflict_style) {
opts.merge = 1; /* implied */
git_xmerge_config("merge.conflictstyle", conflict_style, NULL);
@@ -659,7 +716,15 @@ int cmd_checkout(int argc, const char **argv, const char *prefix)
* 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.
+ * 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).
@@ -680,10 +745,24 @@ int cmd_checkout(int argc, const char **argv, const char *prefix)
if (!strcmp(arg, "-"))
arg = "@{-1}";
- if (get_sha1(arg, rev)) {
+ if (get_sha1_mb(arg, rev)) {
if (has_dash_dash) /* case (1) */
die("invalid reference: %s", arg);
- goto no_reference; /* case (3 -> 2) */
+ if (!patch_mode &&
+ dwim_new_local_branch &&
+ opts.track == BRANCH_TRACK_UNSPECIFIED &&
+ !opts.new_branch &&
+ !check_filename(NULL, arg) &&
+ argc == 1) {
+ const char *remote = unique_tracking_name(arg);
+ if (!remote || get_sha1(remote, rev))
+ goto no_reference;
+ opts.new_branch = arg;
+ arg = remote;
+ /* DWIMmed to create local branch */
+ }
+ else
+ goto no_reference;
}
/* we can't end up being in (2) anymore, eat the argument */
@@ -693,8 +772,10 @@ int cmd_checkout(int argc, const char **argv, const char *prefix)
new.name = arg;
if ((new.commit = lookup_commit_reference_gently(rev, 1))) {
setup_branch_path(&new);
- if (resolve_ref(new.path, rev, 1, NULL))
- new.commit = lookup_commit_reference(rev);
+
+ if ((check_ref_format(new.path) == CHECK_REF_FORMAT_OK) &&
+ resolve_ref(new.path, rev, 1, NULL))
+ ;
else
new.path = NULL;
parse_commit(new.commit);
@@ -721,6 +802,10 @@ int cmd_checkout(int argc, const char **argv, const char *prefix)
}
no_reference:
+
+ if (opts.track == BRANCH_TRACK_UNSPECIFIED)
+ opts.track = git_branch_track;
+
if (argc) {
const char **pathspec = get_pathspec(prefix, argv);
generated by cgit v1.2.1 (git 2.18.0) at 2024-07-30 07:56:44 +0000