--- /dev/null
+#include "cache.h"
+#include "builtin.h"
+#include "parse-options.h"
+#include "refs.h"
+#include "commit.h"
+#include "tree.h"
+#include "tree-walk.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"
+
+static const char * const checkout_usage[] = {
+ "git checkout [options] <branch>",
+ "git checkout [options] [<branch>] -- <file>...",
+ NULL,
+};
+
+static int post_checkout_hook(struct commit *old, struct commit *new,
+ int changed)
+{
+ struct child_process proc;
+ const char *name = git_path("hooks/post-checkout");
+ const char *argv[5];
+
+ if (access(name, X_OK) < 0)
+ return 0;
+
+ memset(&proc, 0, sizeof(proc));
+ argv[0] = name;
+ argv[1] = xstrdup(sha1_to_hex(old->object.sha1));
+ argv[2] = xstrdup(sha1_to_hex(new->object.sha1));
+ argv[3] = changed ? "1" : "0";
+ argv[4] = NULL;
+ proc.argv = argv;
+ proc.no_stdin = 1;
+ proc.stdout_to_stderr = 1;
+ return run_command(&proc);
+}
+
+static int update_some(const unsigned char *sha1, const char *base, int baselen,
+ const char *pathname, unsigned mode, int stage)
+{
+ int len;
+ struct cache_entry *ce;
+
+ if (S_ISGITLINK(mode))
+ return 0;
+
+ 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(len, 0);
+ 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)
+{
+ int newfd;
+ struct lock_file *lock_file = xcalloc(1, sizeof(struct lock_file));
+ newfd = hold_locked_index(lock_file, 1);
+ read_cache();
+
+ read_tree_recursive(tree, "", 0, 0, pathspec, update_some);
+
+ if (write_cache(newfd, active_cache, active_nr) ||
+ commit_locked_index(lock_file))
+ die("unable to write new index file");
+
+ /* 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 checkout_paths(const char **pathspec)
+{
+ int pos;
+ struct checkout state;
+ static char *ps_matched;
+ unsigned char rev[20];
+ int flag;
+ struct commit *head;
+
+ for (pos = 0; pathspec[pos]; pos++)
+ ;
+ ps_matched = xcalloc(1, pos);
+
+ for (pos = 0; pos < active_nr; pos++) {
+ struct cache_entry *ce = active_cache[pos];
+ pathspec_match(pathspec, ps_matched, ce->name, 0);
+ }
+
+ if (report_path_error(ps_matched, pathspec, 0))
+ return 1;
+
+ 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 (pathspec_match(pathspec, NULL, ce->name, 0)) {
+ checkout_entry(ce, &state, NULL);
+ }
+ }
+
+ resolve_ref("HEAD", rev, 0, &flag);
+ head = lookup_commit_reference_gently(rev, 1);
+
+ return post_checkout_hook(head, head, 0);
+}
+
+static void show_local_changes(struct object *head)
+{
+ struct rev_info rev;
+ /* I think we want full paths, even if we're in a subdirectory. */
+ init_revisions(&rev, NULL);
+ rev.abbrev = 0;
+ rev.diffopt.output_format |= DIFF_FORMAT_NAME_STATUS;
+ add_pending_object(&rev, head, NULL);
+ run_diff_index(&rev, 0);
+}
+
+static void describe_detached_head(char *msg, struct commit *commit)
+{
+ struct strbuf sb;
+ strbuf_init(&sb, 0);
+ parse_commit(commit);
+ pretty_print_commit(CMIT_FMT_ONELINE, commit, &sb, 0, "", "", 0, 0);
+ fprintf(stderr, "%s %s... %s\n", msg,
+ find_unique_abbrev(commit->object.sha1, DEFAULT_ABBREV), sb.buf);
+ strbuf_release(&sb);
+}
+
+static int reset_to_new(struct tree *tree, int quiet)
+{
+ struct unpack_trees_options opts;
+ struct tree_desc tree_desc;
+ 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;
+ parse_tree(tree);
+ init_tree_desc(&tree_desc, tree->buffer, tree->size);
+ if (unpack_trees(1, &tree_desc, &opts))
+ return 128;
+ return 0;
+}
+
+static void reset_clean_to_new(struct tree *tree, int quiet)
+{
+ struct unpack_trees_options opts;
+ struct tree_desc tree_desc;
+ memset(&opts, 0, sizeof(opts));
+ opts.head_idx = -1;
+ opts.skip_unmerged = 1;
+ opts.reset = 1;
+ opts.merge = 1;
+ opts.fn = oneway_merge;
+ opts.verbose_update = !quiet;
+ parse_tree(tree);
+ init_tree_desc(&tree_desc, tree->buffer, tree->size);
+ if (unpack_trees(1, &tree_desc, &opts))
+ exit(128);
+}
+
+struct checkout_opts {
+ int quiet;
+ int merge;
+ int force;
+
+ char *new_branch;
+ int new_branch_log;
+ int track;
+};
+
+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(&buf, 0);
+ strbuf_addstr(&buf, "refs/heads/");
+ strbuf_addstr(&buf, branch->name);
+ branch->path = strbuf_detach(&buf, NULL);
+}
+
+static int merge_working_tree(struct checkout_opts *opts,
+ struct branch_info *old, struct branch_info *new,
+ const char *prefix)
+{
+ int ret;
+ struct lock_file *lock_file = xcalloc(1, sizeof(struct lock_file));
+ int newfd = hold_locked_index(lock_file, 1);
+ read_cache();
+
+ if (opts->force) {
+ ret = reset_to_new(new->commit->tree, opts->quiet);
+ 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;
+
+ refresh_cache(REFRESH_QUIET);
+
+ if (unmerged_cache()) {
+ ret = opts->merge ? -1 :
+ error("you need to resolve your current index first");
+ } else {
+ topts.update = 1;
+ topts.merge = 1;
+ topts.gently = opts->merge;
+ topts.fn = twoway_merge;
+ topts.dir = xcalloc(1, sizeof(*topts.dir));
+ topts.dir->show_ignored = 1;
+ topts.dir->exclude_per_dir = ".gitignore";
+ topts.prefix = prefix;
+ tree = parse_tree_indirect(old->commit->object.sha1);
+ 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) {
+ /*
+ * 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;
+ if (!opts->merge)
+ return 1;
+ parse_commit(old->commit);
+
+ /* 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(0, NULL, NULL);
+ work = write_tree_from_memory();
+
+ ret = reset_to_new(new->commit->tree, opts->quiet);
+ if (ret)
+ return ret;
+ merge_trees(new->commit->tree, work, old->commit->tree,
+ new->name, "local", &result);
+ reset_clean_to_new(new->commit->tree, opts->quiet);
+ }
+ }
+
+ if (write_cache(newfd, active_cache, active_nr) ||
+ commit_locked_index(lock_file))
+ die("unable to write new index file");
+
+ if (!opts->force)
+ show_local_changes(&new->commit->object);
+
+ return 0;
+}
+
+static void update_refs_for_switch(struct checkout_opts *opts,
+ struct branch_info *old,
+ struct branch_info *new)
+{
+ struct strbuf msg;
+ const char *old_desc;
+ if (opts->new_branch) {
+ create_branch(old->name, opts->new_branch, new->name, 0,
+ opts->new_branch_log, opts->track);
+ new->name = opts->new_branch;
+ setup_branch_path(new);
+ }
+
+ strbuf_init(&msg, 0);
+ old_desc = old->name;
+ if (!old_desc)
+ old_desc = sha1_to_hex(old->commit->object.sha1);
+ strbuf_addf(&msg, "checkout: moving from %s to %s",
+ old_desc, new->name);
+
+ if (new->path) {
+ create_symref("HEAD", new->path, msg.buf);
+ if (!opts->quiet) {
+ if (old->path && !strcmp(new->path, old->path))
+ fprintf(stderr, "Already on \"%s\"\n",
+ new->name);
+ else
+ fprintf(stderr, "Switched to%s branch \"%s\"\n",
+ opts->new_branch ? " a new" : "",
+ new->name);
+ }
+ } else if (strcmp(new->name, "HEAD")) {
+ 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);
+ describe_detached_head("HEAD is now at", new->commit);
+ }
+ }
+ remove_branch_state();
+ strbuf_release(&msg);
+}
+
+static int switch_branches(struct checkout_opts *opts,
+ struct branch_info *new, const char *prefix)
+{
+ int ret = 0;
+ struct branch_info old;
+ unsigned char rev[20];
+ int flag;
+ memset(&old, 0, sizeof(old));
+ old.path = resolve_ref("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);
+ }
+
+ /*
+ * If the new thing isn't a branch and isn't HEAD and we're
+ * not starting a new branch, and we want messages, and we
+ * weren't on a branch, and we're moving to a new commit,
+ * describe the old commit.
+ */
+ if (!new->path && strcmp(new->name, "HEAD") && !opts->new_branch &&
+ !opts->quiet && !old.path && new->commit != old.commit)
+ describe_detached_head("Previous HEAD position was", old.commit);
+
+ if (!old.commit) {
+ if (!opts->quiet) {
+ fprintf(stderr, "warning: You appear to be on a branch yet to be born.\n");
+ fprintf(stderr, "warning: Forcing checkout of %s.\n", new->name);
+ }
+ opts->force = 1;
+ }
+
+ ret = merge_working_tree(opts, &old, new, prefix);
+ if (ret)
+ return ret;
+
+ update_refs_for_switch(opts, &old, new);
+
+ return post_checkout_hook(old.commit, new->commit, 1);
+}
+
+static int branch_track = 0;
+
+static int git_checkout_config(const char *var, const char *value)
+{
+ if (!strcmp(var, "branch.autosetupmerge"))
+ branch_track = git_config_bool(var, value);
+
+ return git_default_config(var, value);
+}
+
+int cmd_checkout(int argc, const char **argv, const char *prefix)
+{
+ struct checkout_opts opts;
+ unsigned char rev[20];
+ const char *arg;
+ struct branch_info new;
+ struct tree *source_tree = NULL;
+ struct option options[] = {
+ OPT__QUIET(&opts.quiet),
+ OPT_STRING('b', NULL, &opts.new_branch, "new branch", "branch"),
+ OPT_BOOLEAN('l', NULL, &opts.new_branch_log, "log for new branch"),
+ OPT_BOOLEAN( 0 , "track", &opts.track, "track"),
+ OPT_BOOLEAN('f', NULL, &opts.force, "force"),
+ OPT_BOOLEAN('m', NULL, &opts.merge, "merge"),
+ };
+
+ memset(&opts, 0, sizeof(opts));
+ memset(&new, 0, sizeof(new));
+
+ git_config(git_checkout_config);
+
+ opts.track = branch_track;
+
+ argc = parse_options(argc, argv, options, checkout_usage, 0);
+ if (argc) {
+ arg = argv[0];
+ if (get_sha1(arg, rev))
+ ;
+ else 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.commit = lookup_commit_reference(rev);
+ else
+ new.path = NULL;
+ parse_commit(new.commit);
+ source_tree = new.commit->tree;
+ argv++;
+ argc--;
+ } else if ((source_tree = parse_tree_indirect(rev))) {
+ argv++;
+ argc--;
+ }
+ }
+
+ if (argc && !strcmp(argv[0], "--")) {
+ argv++;
+ argc--;
+ }
+
+ if (!opts.new_branch && (opts.track != branch_track))
+ die("git checkout: --track and --no-track require -b");
+
+ if (opts.force && opts.merge)
+ die("git checkout: -f and -m are incompatible");
+
+ if (argc) {
+ const char **pathspec = get_pathspec(prefix, argv);
+ /* Checkout paths */
+ if (opts.new_branch || opts.force || opts.merge) {
+ if (argc == 1) {
+ die("git checkout: updating paths is incompatible with switching branches/forcing\nDid you intend to checkout '%s' which can not be resolved as commit?", argv[0]);
+ } else {
+ die("git checkout: updating paths is incompatible with switching branches/forcing");
+ }
+ }
+
+ if (source_tree)
+ read_tree_some(source_tree, pathspec);
+ else
+ read_cache();
+ return checkout_paths(pathspec);
+ }
+
+ if (new.name && !new.commit) {
+ die("Cannot switch branch to a non-commit.");
+ }
+
+ return switch_branches(&opts, &new, prefix);
+}
--- /dev/null
+#!/bin/sh
+
+OPTIONS_KEEPDASHDASH=t
+OPTIONS_SPEC="\
+git-checkout [options] [<branch>] [<paths>...]
+--
+b= create a new branch started at <branch>
+l create the new branch's reflog
+track arrange that the new branch tracks the remote branch
+f proceed even if the index or working tree is not HEAD
+m merge local modifications into the new branch
+q,quiet be quiet
+"
+SUBDIRECTORY_OK=Sometimes
+. git-sh-setup
+require_work_tree
+
+old_name=HEAD
+old=$(git rev-parse --verify $old_name 2>/dev/null)
+oldbranch=$(git symbolic-ref $old_name 2>/dev/null)
+new=
+new_name=
+force=
+branch=
+track=
+newbranch=
+newbranch_log=
+merge=
+quiet=
+v=-v
+LF='
+'
+
+while test $# != 0; do
+ case "$1" in
+ -b)
+ shift
+ newbranch="$1"
+ [ -z "$newbranch" ] &&
+ die "git checkout: -b needs a branch name"
+ git show-ref --verify --quiet -- "refs/heads/$newbranch" &&
+ die "git checkout: branch $newbranch already exists"
+ git check-ref-format "heads/$newbranch" ||
+ die "git checkout: we do not like '$newbranch' as a branch name."
+ ;;
+ -l)
+ newbranch_log=-l
+ ;;
+ --track|--no-track)
+ track="$1"
+ ;;
+ -f)
+ force=1
+ ;;
+ -m)
+ merge=1
+ ;;
+ -q|--quiet)
+ quiet=1
+ v=
+ ;;
+ --)
+ shift
+ break
+ ;;
+ *)
+ usage
+ ;;
+ esac
+ shift
+done
+
+arg="$1"
+if rev=$(git rev-parse --verify "$arg^0" 2>/dev/null)
+then
+ [ -z "$rev" ] && die "unknown flag $arg"
+ new_name="$arg"
+ if git show-ref --verify --quiet -- "refs/heads/$arg"
+ then
+ rev=$(git rev-parse --verify "refs/heads/$arg^0")
+ branch="$arg"
+ fi
+ new="$rev"
+ shift
+elif rev=$(git rev-parse --verify "$arg^{tree}" 2>/dev/null)
+then
+ # checking out selected paths from a tree-ish.
+ new="$rev"
+ new_name="$arg^{tree}"
+ shift
+fi
+[ "$1" = "--" ] && shift
+
+case "$newbranch,$track" in
+,--*)
+ die "git checkout: --track and --no-track require -b"
+esac
+
+case "$force$merge" in
+11)
+ die "git checkout: -f and -m are incompatible"
+esac
+
+# The behaviour of the command with and without explicit path
+# parameters is quite different.
+#
+# Without paths, we are checking out everything in the work tree,
+# possibly switching branches. This is the traditional behaviour.
+#
+# With paths, we are _never_ switching branch, but checking out
+# the named paths from either index (when no rev is given),
+# or the named tree-ish (when rev is given).
+
+if test "$#" -ge 1
+then
+ hint=
+ if test "$#" -eq 1
+ then
+ hint="
+Did you intend to checkout '$@' which can not be resolved as commit?"
+ fi
+ if test '' != "$newbranch$force$merge"
+ then
+ die "git checkout: updating paths is incompatible with switching branches/forcing$hint"
+ fi
+ if test '' != "$new"
+ then
+ # from a specific tree-ish; note that this is for
+ # rescuing paths and is never meant to remove what
+ # is not in the named tree-ish.
+ git ls-tree --full-name -r "$new" "$@" |
+ git update-index --index-info || exit $?
+ fi
+
+ # Make sure the request is about existing paths.
+ git ls-files --full-name --error-unmatch -- "$@" >/dev/null || exit
+ git ls-files --full-name -- "$@" |
+ (cd_to_toplevel && git checkout-index -f -u --stdin)
+
+ # Run a post-checkout hook -- the HEAD does not change so the
+ # current HEAD is passed in for both args
+ if test -x "$GIT_DIR"/hooks/post-checkout; then
+ "$GIT_DIR"/hooks/post-checkout $old $old 0
+ fi
+
+ exit $?
+else
+ # Make sure we did not fall back on $arg^{tree} codepath
+ # since we are not checking out from an arbitrary tree-ish,
+ # but switching branches.
+ if test '' != "$new"
+ then
+ git rev-parse --verify "$new^{commit}" >/dev/null 2>&1 ||
+ die "Cannot switch branch to a non-commit."
+ fi
+fi
+
+# We are switching branches and checking out trees, so
+# we *NEED* to be at the toplevel.
+cd_to_toplevel
+
+[ -z "$new" ] && new=$old && new_name="$old_name"
+
+# If we don't have an existing branch that we're switching to,
+# and we don't have a new branch name for the target we
+# are switching to, then we are detaching our HEAD from any
+# branch. However, if "git checkout HEAD" detaches the HEAD
+# from the current branch, even though that may be logically
+# correct, it feels somewhat funny. More importantly, we do not
+# want "git checkout" nor "git checkout -f" to detach HEAD.
+
+detached=
+detach_warn=
+
+describe_detached_head () {
+ test -n "$quiet" || {
+ printf >&2 "$1 "
+ GIT_PAGER= git log >&2 -1 --pretty=oneline --abbrev-commit "$2" --
+ }
+}
+
+if test -z "$branch$newbranch" && test "$new_name" != "$old_name"
+then
+ detached="$new"
+ if test -n "$oldbranch" && test -z "$quiet"
+ then
+ detach_warn="Note: moving to \"$new_name\" which isn't a local branch
+If you want to create a new branch from this checkout, you may do so
+(now or later) by using -b with the checkout command again. Example:
+ git checkout -b <new_branch_name>"
+ fi
+elif test -z "$oldbranch" && test "$new" != "$old"
+then
+ describe_detached_head 'Previous HEAD position was' "$old"
+fi
+
+if [ "X$old" = X ]
+then
+ if test -z "$quiet"
+ then
+ echo >&2 "warning: You appear to be on a branch yet to be born."
+ echo >&2 "warning: Forcing checkout of $new_name."
+ fi
+ force=1
+fi
+
+if [ "$force" ]
+then
+ git read-tree $v --reset -u $new
+else
+ git update-index --refresh >/dev/null
+ merge_error=$(git read-tree -m -u --exclude-per-directory=.gitignore $old $new 2>&1) || (
+ case "$merge" in
+ '')
+ echo >&2 "$merge_error"
+ exit 1 ;;
+ esac
+
+ # Match the index to the working tree, and do a three-way.
+ git diff-files --name-only | git update-index --remove --stdin &&
+ work=`git write-tree` &&
+ git read-tree $v --reset -u $new || exit
+
+ eval GITHEAD_$new='${new_name:-${branch:-$new}}' &&
+ eval GITHEAD_$work=local &&
+ export GITHEAD_$new GITHEAD_$work &&
+ git merge-recursive $old -- $new $work
+
+ # Do not register the cleanly merged paths in the index yet.
+ # this is not a real merge before committing, but just carrying
+ # the working tree changes along.
+ unmerged=`git ls-files -u`
+ git read-tree $v --reset $new
+ case "$unmerged" in
+ '') ;;
+ *)
+ (
+ z40=0000000000000000000000000000000000000000
+ echo "$unmerged" |
+ sed -e 's/^[0-7]* [0-9a-f]* /'"0 $z40 /"
+ echo "$unmerged"
+ ) | git update-index --index-info
+ ;;
+ esac
+ exit 0
+ )
+ saved_err=$?
+ if test "$saved_err" = 0 && test -z "$quiet"
+ then
+ git diff-index --name-status "$new"
+ fi
+ (exit $saved_err)
+fi
+
+#
+# Switch the HEAD pointer to the new branch if we
+# checked out a branch head, and remove any potential
+# old MERGE_HEAD's (subsequent commits will clearly not
+# be based on them, since we re-set the index)
+#
+if [ "$?" -eq 0 ]; then
+ if [ "$newbranch" ]; then
+ git branch $track $newbranch_log "$newbranch" "$new_name" || exit
+ branch="$newbranch"
+ fi
+ if test -n "$branch"
+ then
+ old_branch_name=`expr "z$oldbranch" : 'zrefs/heads/\(.*\)'`
+ GIT_DIR="$GIT_DIR" git symbolic-ref -m "checkout: moving from ${old_branch_name:-$old} to $branch" HEAD "refs/heads/$branch"
+ if test -n "$quiet"
+ then
+ true # nothing
+ elif test "refs/heads/$branch" = "$oldbranch"
+ then
+ echo >&2 "Already on branch \"$branch\""
+ else
+ echo >&2 "Switched to${newbranch:+ a new} branch \"$branch\""
+ fi
+ elif test -n "$detached"
+ then
+ old_branch_name=`expr "z$oldbranch" : 'zrefs/heads/\(.*\)'`
+ git update-ref --no-deref -m "checkout: moving from ${old_branch_name:-$old} to $arg" HEAD "$detached" ||
+ die "Cannot detach HEAD"
+ if test -n "$detach_warn"
+ then
+ echo >&2 "$detach_warn"
+ fi
+ describe_detached_head 'HEAD is now at' HEAD
+ fi
+ rm -f "$GIT_DIR/MERGE_HEAD"
+else
+ exit 1
+fi
+
+# Run a post-checkout hook
+if test -x "$GIT_DIR"/hooks/post-checkout; then
+ "$GIT_DIR"/hooks/post-checkout $old $new 1
+fi
+++ /dev/null
-#!/bin/sh
-
-OPTIONS_KEEPDASHDASH=t
-OPTIONS_SPEC="\
-git-checkout [options] [<branch>] [<paths>...]
---
-b= create a new branch started at <branch>
-l create the new branch's reflog
-track arrange that the new branch tracks the remote branch
-f proceed even if the index or working tree is not HEAD
-m merge local modifications into the new branch
-q,quiet be quiet
-"
-SUBDIRECTORY_OK=Sometimes
-. git-sh-setup
-require_work_tree
-
-old_name=HEAD
-old=$(git rev-parse --verify $old_name 2>/dev/null)
-oldbranch=$(git symbolic-ref $old_name 2>/dev/null)
-new=
-new_name=
-force=
-branch=
-track=
-newbranch=
-newbranch_log=
-merge=
-quiet=
-v=-v
-LF='
-'
-
-while test $# != 0; do
- case "$1" in
- -b)
- shift
- newbranch="$1"
- [ -z "$newbranch" ] &&
- die "git checkout: -b needs a branch name"
- git show-ref --verify --quiet -- "refs/heads/$newbranch" &&
- die "git checkout: branch $newbranch already exists"
- git check-ref-format "heads/$newbranch" ||
- die "git checkout: we do not like '$newbranch' as a branch name."
- ;;
- -l)
- newbranch_log=-l
- ;;
- --track|--no-track)
- track="$1"
- ;;
- -f)
- force=1
- ;;
- -m)
- merge=1
- ;;
- -q|--quiet)
- quiet=1
- v=
- ;;
- --)
- shift
- break
- ;;
- *)
- usage
- ;;
- esac
- shift
-done
-
-arg="$1"
-if rev=$(git rev-parse --verify "$arg^0" 2>/dev/null)
-then
- [ -z "$rev" ] && die "unknown flag $arg"
- new_name="$arg"
- if git show-ref --verify --quiet -- "refs/heads/$arg"
- then
- rev=$(git rev-parse --verify "refs/heads/$arg^0")
- branch="$arg"
- fi
- new="$rev"
- shift
-elif rev=$(git rev-parse --verify "$arg^{tree}" 2>/dev/null)
-then
- # checking out selected paths from a tree-ish.
- new="$rev"
- new_name="$arg^{tree}"
- shift
-fi
-[ "$1" = "--" ] && shift
-
-case "$newbranch,$track" in
-,--*)
- die "git checkout: --track and --no-track require -b"
-esac
-
-case "$force$merge" in
-11)
- die "git checkout: -f and -m are incompatible"
-esac
-
-# The behaviour of the command with and without explicit path
-# parameters is quite different.
-#
-# Without paths, we are checking out everything in the work tree,
-# possibly switching branches. This is the traditional behaviour.
-#
-# With paths, we are _never_ switching branch, but checking out
-# the named paths from either index (when no rev is given),
-# or the named tree-ish (when rev is given).
-
-if test "$#" -ge 1
-then
- hint=
- if test "$#" -eq 1
- then
- hint="
-Did you intend to checkout '$@' which can not be resolved as commit?"
- fi
- if test '' != "$newbranch$force$merge"
- then
- die "git checkout: updating paths is incompatible with switching branches/forcing$hint"
- fi
- if test '' != "$new"
- then
- # from a specific tree-ish; note that this is for
- # rescuing paths and is never meant to remove what
- # is not in the named tree-ish.
- git ls-tree --full-name -r "$new" "$@" |
- git update-index --index-info || exit $?
- fi
-
- # Make sure the request is about existing paths.
- git ls-files --full-name --error-unmatch -- "$@" >/dev/null || exit
- git ls-files --full-name -- "$@" |
- (cd_to_toplevel && git checkout-index -f -u --stdin)
-
- # Run a post-checkout hook -- the HEAD does not change so the
- # current HEAD is passed in for both args
- if test -x "$GIT_DIR"/hooks/post-checkout; then
- "$GIT_DIR"/hooks/post-checkout $old $old 0
- fi
-
- exit $?
-else
- # Make sure we did not fall back on $arg^{tree} codepath
- # since we are not checking out from an arbitrary tree-ish,
- # but switching branches.
- if test '' != "$new"
- then
- git rev-parse --verify "$new^{commit}" >/dev/null 2>&1 ||
- die "Cannot switch branch to a non-commit."
- fi
-fi
-
-# We are switching branches and checking out trees, so
-# we *NEED* to be at the toplevel.
-cd_to_toplevel
-
-[ -z "$new" ] && new=$old && new_name="$old_name"
-
-# If we don't have an existing branch that we're switching to,
-# and we don't have a new branch name for the target we
-# are switching to, then we are detaching our HEAD from any
-# branch. However, if "git checkout HEAD" detaches the HEAD
-# from the current branch, even though that may be logically
-# correct, it feels somewhat funny. More importantly, we do not
-# want "git checkout" nor "git checkout -f" to detach HEAD.
-
-detached=
-detach_warn=
-
-describe_detached_head () {
- test -n "$quiet" || {
- printf >&2 "$1 "
- GIT_PAGER= git log >&2 -1 --pretty=oneline --abbrev-commit "$2" --
- }
-}
-
-if test -z "$branch$newbranch" && test "$new_name" != "$old_name"
-then
- detached="$new"
- if test -n "$oldbranch" && test -z "$quiet"
- then
- detach_warn="Note: moving to \"$new_name\" which isn't a local branch
-If you want to create a new branch from this checkout, you may do so
-(now or later) by using -b with the checkout command again. Example:
- git checkout -b <new_branch_name>"
- fi
-elif test -z "$oldbranch" && test "$new" != "$old"
-then
- describe_detached_head 'Previous HEAD position was' "$old"
-fi
-
-if [ "X$old" = X ]
-then
- if test -z "$quiet"
- then
- echo >&2 "warning: You appear to be on a branch yet to be born."
- echo >&2 "warning: Forcing checkout of $new_name."
- fi
- force=1
-fi
-
-if [ "$force" ]
-then
- git read-tree $v --reset -u $new
-else
- git update-index --refresh >/dev/null
- merge_error=$(git read-tree -m -u --exclude-per-directory=.gitignore $old $new 2>&1) || (
- case "$merge" in
- '')
- echo >&2 "$merge_error"
- exit 1 ;;
- esac
-
- # Match the index to the working tree, and do a three-way.
- git diff-files --name-only | git update-index --remove --stdin &&
- work=`git write-tree` &&
- git read-tree $v --reset -u $new || exit
-
- eval GITHEAD_$new='${new_name:-${branch:-$new}}' &&
- eval GITHEAD_$work=local &&
- export GITHEAD_$new GITHEAD_$work &&
- git merge-recursive $old -- $new $work
-
- # Do not register the cleanly merged paths in the index yet.
- # this is not a real merge before committing, but just carrying
- # the working tree changes along.
- unmerged=`git ls-files -u`
- git read-tree $v --reset $new
- case "$unmerged" in
- '') ;;
- *)
- (
- z40=0000000000000000000000000000000000000000
- echo "$unmerged" |
- sed -e 's/^[0-7]* [0-9a-f]* /'"0 $z40 /"
- echo "$unmerged"
- ) | git update-index --index-info
- ;;
- esac
- exit 0
- )
- saved_err=$?
- if test "$saved_err" = 0 && test -z "$quiet"
- then
- git diff-index --name-status "$new"
- fi
- (exit $saved_err)
-fi
-
-#
-# Switch the HEAD pointer to the new branch if we
-# checked out a branch head, and remove any potential
-# old MERGE_HEAD's (subsequent commits will clearly not
-# be based on them, since we re-set the index)
-#
-if [ "$?" -eq 0 ]; then
- if [ "$newbranch" ]; then
- git branch $track $newbranch_log "$newbranch" "$new_name" || exit
- branch="$newbranch"
- fi
- if test -n "$branch"
- then
- old_branch_name=`expr "z$oldbranch" : 'zrefs/heads/\(.*\)'`
- GIT_DIR="$GIT_DIR" git symbolic-ref -m "checkout: moving from ${old_branch_name:-$old} to $branch" HEAD "refs/heads/$branch"
- if test -n "$quiet"
- then
- true # nothing
- elif test "refs/heads/$branch" = "$oldbranch"
- then
- echo >&2 "Already on branch \"$branch\""
- else
- echo >&2 "Switched to${newbranch:+ a new} branch \"$branch\""
- fi
- elif test -n "$detached"
- then
- old_branch_name=`expr "z$oldbranch" : 'zrefs/heads/\(.*\)'`
- git update-ref --no-deref -m "checkout: moving from ${old_branch_name:-$old} to $arg" HEAD "$detached" ||
- die "Cannot detach HEAD"
- if test -n "$detach_warn"
- then
- echo >&2 "$detach_warn"
- fi
- describe_detached_head 'HEAD is now at' HEAD
- fi
- rm -f "$GIT_DIR/MERGE_HEAD"
-else
- exit 1
-fi
-
-# Run a post-checkout hook
-if test -x "$GIT_DIR"/hooks/post-checkout; then
- "$GIT_DIR"/hooks/post-checkout $old $new 1
-fi