#!/bin/sh
-USAGE='[-f] [-b <new_branch>] [-m] [<branch>] [<paths>...]'
+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=$(git-rev-parse HEAD)
old_name=HEAD
+old=$(git rev-parse --verify $old_name 2>/dev/null)
+oldbranch=$(git symbolic-ref $old_name 2>/dev/null)
new=
new_name=
force=
branch=
+track=
newbranch=
newbranch_log=
merge=
-while [ "$#" != "0" ]; do
- arg="$1"
- shift
- case "$arg" in
- "-b")
- newbranch="$1"
+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"
- [ -e "$GIT_DIR/refs/heads/$newbranch" ] &&
+ git show-ref --verify --quiet -- "refs/heads/$newbranch" &&
die "git checkout: branch $newbranch already exists"
- git-check-ref-format "heads/$newbranch" ||
+ git check-ref-format "heads/$newbranch" ||
die "git checkout: we do not like '$newbranch' as a branch name."
;;
- "-l")
- newbranch_log=1
+ -l)
+ newbranch_log=-l
+ ;;
+ --track|--no-track)
+ track="$1"
;;
- "-f")
+ -f)
force=1
;;
-m)
merge=1
;;
+ -q|--quiet)
+ quiet=1
+ v=
+ ;;
--)
+ shift
break
;;
- -*)
- usage
- ;;
*)
- if rev=$(git-rev-parse --verify "$arg^0" 2>/dev/null)
- then
- if [ -z "$rev" ]; then
- echo "unknown flag $arg"
- exit 1
- fi
- new="$rev"
- new_name="$arg^0"
- if [ -f "$GIT_DIR/refs/heads/$arg" ]; then
- branch="$arg"
- fi
- 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}"
- branch=
- else
- new=
- new_name=
- branch=
- set x "$arg" "$@"
- shift
- fi
- case "$1" in
- --)
- shift ;;
- esac
- break
+ usage
;;
- esac
+ esac
+ shift
done
+arg="$1"
+rev=$(git rev-parse --verify "$arg" 2>/dev/null)
+if rev=$(git rev-parse --verify "$rev^0" 2>/dev/null)
+then
+ [ -z "$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 "$rev^{tree}" 2>/dev/null)
+then
+ # checking out selected paths from a tree-ish.
+ new="$rev"
+ new_name="$rev^{tree}"
+ shift
+fi
+[ "$1" = "--" ] && shift
+
+case "$newbranch,$track" in
+,--*)
+ die "git checkout: --track and --no-track require -b"
+esac
+
+case "$force$merge" in
+11)
+ die "git checkout: -f and -m are incompatible"
+esac
+
# The behaviour of the command with and without explicit path
# parameters is quite different.
#
# from a specific tree-ish; note that this is for
# rescuing paths and is never meant to remove what
# is not in the named tree-ish.
- git-ls-tree --full-name -r "$new" "$@" |
- git-update-index --index-info || exit $?
+ git ls-tree --full-name -r "$new" "$@" |
+ git update-index --index-info || exit $?
fi
- git-checkout-index -f -u -- "$@"
+
+ # 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 $arg^{tree} codepath
# but switching branches.
if test '' != "$new"
then
- git-rev-parse --verify "$new^{commit}" >/dev/null 2>&1 ||
+ git rev-parse --verify "$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.
-cdup=$(git-rev-parse --show-cdup)
-if test ! -z "$cdup"
-then
- cd "$cdup"
-fi
+cd_to_toplevel
[ -z "$new" ] && new=$old && new_name="$old_name"
-# If we don't have an old branch that we're switching to,
+# 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'd better just be checking out
-# what we already had
+# 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' "$old"
+fi
-[ -z "$branch$newbranch" ] &&
- [ "$new" != "$old" ] &&
- die "git checkout: to checkout the requested commit you need to specify
- a name for a new branch which is created and switched to"
+if [ "X$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 --reset -u $new
+ git read-tree $v --reset -u $new
else
- git-update-index --refresh >/dev/null
- merge_error=$(git-read-tree -m -u $old $new 2>&1) || (
+ git update-index --refresh >/dev/null
+ merge_error=$(git read-tree -m -u --exclude-per-directory=.gitignore $old $new 2>&1) || (
case "$merge" in
'')
echo >&2 "$merge_error"
esac
# Match the index to the working tree, and do a three-way.
- git diff-files --name-only | git update-index --remove --stdin &&
+ git diff-files --name-only | git update-index --remove --stdin &&
work=`git write-tree` &&
- git read-tree --reset -u $new &&
- git read-tree -m -u --aggressive $old $new $work || exit
+ git read-tree $v --reset -u $new || exit
- if result=`git write-tree 2>/dev/null`
- then
- echo >&2 "Trivially automerged."
- else
- git merge-index -o git-merge-one-file -a
- fi
+ eval GITHEAD_$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 --reset $new
+ git read-tree $v --reset $new
case "$unmerged" in
'') ;;
*)
exit 0
)
saved_err=$?
- if test "$saved_err" = 0
+ if test "$saved_err" = 0 && test -z "$quiet"
then
- test "$new" = "$old" || git diff-index --name-status "$new"
+ git diff-index --name-status "$new"
fi
(exit $saved_err)
fi
-#
+#
# Switch the HEAD pointer to the new branch if we
# checked out a branch head, and remove any potential
# old MERGE_HEAD's (subsequent commits will clearly not
#
if [ "$?" -eq 0 ]; then
if [ "$newbranch" ]; then
- if [ "$newbranch_log" ]; then
- mkdir -p $(dirname "$GIT_DIR/logs/refs/heads/$newbranch")
- touch "$GIT_DIR/logs/refs/heads/$newbranch"
- fi
- git-update-ref -m "checkout: Created from $new_name" "refs/heads/$newbranch" $new || exit
+ git branch $track $newbranch_log "$newbranch" "$new_name" || exit
branch="$newbranch"
fi
- [ "$branch" ] &&
- GIT_DIR="$GIT_DIR" git-symbolic-ref HEAD "refs/heads/$branch"
+ if test -n "$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