#!/bin/sh
-USAGE='[-f] [-b <new_branch>] [-m] [<branch>] [<paths>...]'
+USAGE='[-
q] [-f] [-b <new_branch>] [-m] [<branch>] [<paths>...]'
SUBDIRECTORY_OK=Sometimes
. git-sh-setup
+require_work_tree
old_name=HEAD
old=$(git-rev-parse --verify $old_name 2>/dev/null)
newbranch=
newbranch_log=
merge=
+quiet=
LF='
'
while [ "$#" != "0" ]; do
-m)
merge=1
;;
+ "-q")
+ quiet=1
+ ;;
--)
break
;;
# 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"
# correct, it feels somewhat funny. More importantly, we do not
# want "git checkout" nor "git checkout -f" to detach HEAD.
+detached=
+detach_warn=
+
if test -z "$branch$newbranch" && test "$new" != "$old"
then
- # NEEDSWORK: we would want to have a command here
- # that allows us to detach the HEAD atomically. Perhaps
- # something like "git update-ref --detach HEAD $new"
- echo "$new" >"$GIT_DIR/HEAD.new" &&
- mv "$GIT_DIR/HEAD.new" "$GIT_DIR/HEAD" || die "Cannot detach HEAD"
-
- if test -n "$oldbranch"
+ detached="$new"
+ if test -n "$oldbranch" && test -z "$quiet"
then
- echo >&2 "warning: you are not on ANY branch anymore.
-If you meant to create a new branch from the commit, you need -b to
-associate a new branch with the wanted checkout. Example:
- git checkout -b <new_branch_name> $arg
-"
+ detach_warn="Note: moving to \"$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 "$oldbranch" && test -n "$branch"
+elif test -z "$oldbranch" && test -z "$quiet"
then
- # Coming back...
- if test -z "$force"
- then
- mb=$(git merge-base --all $old $new) &&
- case "$LF$mb$LF" in
- *"$LF$old$LF"*) : ;;
- *) false ;;
- esac || {
- echo >&2 \
-"You are not on a branch and switching to $new_name branch may lose
-your changes. Use 'git checkout -f $new_name' if you want to."
- exit 1;
- }
- fi
+ echo >&2 "Previous HEAD position was $old"
fi
if [ "X$old" = X ]
then
- echo >&2 "warning: You appear to be on a branch yet to be born."
- echo >&2 "warning: Forcing checkout of $new_name."
+ if test -z "$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
# 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 --reset -u $new &&
- git read-tree -m -u --aggressive --exclude-per-directory=.gitignore $old $new $work ||
- exit
+ git read-tree --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 $work
# Do not register the cleanly merged paths in the index yet.
# this is not a real merge before committing, but just carrying
exit 0
)
saved_err=$?
- 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
git-update-ref -m "checkout: Created from $new_name" "refs/heads/$newbranch" $new || exit
branch="$newbranch"
fi
- [ "$branch" ] &&
- GIT_DIR="$GIT_DIR" git-symbolic-ref HEAD "refs/heads/$branch"
+ if test -n "$branch"
+ then
+ GIT_DIR="$GIT_DIR" git-symbolic-ref -m "checkout: moving to $branch" HEAD "refs/heads/$branch"
+ if test -z "$quiet"
+ then
+ echo >&2 "Switched to${newbranch:+ a new} branch \"$branch\""
+ fi
+ elif test -n "$detached"
+ then
+ # NEEDSWORK: we would want a command to detach the HEAD
+ # atomically, instead of this handcrafted command sequence.
+ # Perhaps:
+ # git update-ref --detach HEAD $new
+ # or something like that...
+ #
+ git-rev-parse HEAD >"$GIT_DIR/HEAD.new" &&
+ mv "$GIT_DIR/HEAD.new" "$GIT_DIR/HEAD" &&
+ git-update-ref -m "checkout: moving to $arg" HEAD "$detached" ||
+ die "Cannot detach HEAD"
+ if test -n "$detach_warn"
+ then
+ echo >&2 "$detach_warn"
+ fi
+ fi
rm -f "$GIT_DIR/MERGE_HEAD"
else
exit 1