git/git-checkout.sh
Junio C Hamano 215a7ad1ef Big tool rename.
As promised, this is the "big tool rename" patch.  The primary differences
since 0.99.6 are:

  (1) git-*-script are no more.  The commands installed do not
      have any such suffix so users do not have to remember if
      something is implemented as a shell script or not.

  (2) Many command names with 'cache' in them are renamed with
      'index' if that is what they mean.

There are backward compatibility symblic links so that you and
Porcelains can keep using the old names, but the backward
compatibility support  is expected to be removed in the near
future.

Signed-off-by: Junio C Hamano <junkio@cox.net>
2005-09-07 17:45:20 -07:00

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#!/bin/sh
. git-sh-setup || die "Not a git archive"
old=$(git-rev-parse HEAD)
new=
force=
branch=
newbranch=
while [ "$#" != "0" ]; do
arg="$1"
shift
case "$arg" in
"-b")
newbranch="$1"
shift
[ -z "$newbranch" ] &&
die "git checkout: -b needs a branch name"
[ -e "$GIT_DIR/refs/heads/$newbranch" ] &&
die "git checkout: branch $newbranch already exists"
;;
"-f")
force=1
;;
*)
rev=$(git-rev-parse --verify "$arg^0") || exit
if [ -z "$rev" ]; then
echo "unknown flag $arg"
exit 1
fi
if [ "$new" ]; then
echo "Multiple revisions?"
exit 1
fi
new="$rev"
if [ -f "$GIT_DIR/refs/heads/$arg" ]; then
branch="$arg"
fi
;;
esac
done
[ -z "$new" ] && new=$old
#
# If we don't have an old 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
#
[ -z "$branch$newbranch" ] &&
[ "$new" != "$old" ] &&
die "git checkout: you need to specify a new branch name"
if [ "$force" ]
then
git-read-tree --reset $new &&
git-checkout-index -q -f -u -a
else
git-read-tree -m -u $old $new
fi
#
# Switch the HEAD pointer to the new branch if it we
# checked out a branch head, and remove any potential
# old MERGE_HEAD's (subsequent commits will clearly not
# be based on them, since we re-set the index)
#
if [ "$?" -eq 0 ]; then
if [ "$newbranch" ]; then
echo $new > "$GIT_DIR/refs/heads/$newbranch"
branch="$newbranch"
fi
[ "$branch" ] && ln -sf "refs/heads/$branch" "$GIT_DIR/HEAD"
rm -f "$GIT_DIR/MERGE_HEAD"
else
exit 1
fi