git-checkout-script

   1 #!/bin/sh
   2 . git-sh-setup-script || die "Not a git archive"
   3
   4 old=$(git-rev-parse HEAD)
   5 new=
   6 force=
   7 branch=
   8 while [ "$#" != "0" ]; do
   9     arg="$1"
  10     shift
  11     case "$arg" in
  12         "-f")
  13                 force=1
  14                 ;;
  15         *)
  16                 rev=$(git-rev-parse --verify --revs-only "$arg")
  17                 if [ -z "$rev" ]; then
  18                         echo "unknown flag $arg"
  19                         exit 1
  20                 fi
  21                 if [ "$new" ]; then
  22                         echo "Multiple revisions?"
  23                         exit 1
  24                 fi
  25                 new="$rev"
  26                 if [ -f "$GIT_DIR/refs/heads/$arg" ]; then
  27                         branch="$arg"
  28                 fi
  29                 ;;
  30     esac
  31     i=$(($i+1))
  32 done
  33 [ -z "$new" ] && new=$old
  34
  35 if [ "$force" ]
  36 then
  37     git-read-tree --reset $new &&
  38         git-checkout-cache -q -f -u -a
  39 else
  40     git-read-tree -m -u $old $new
  41 fi
  42
  43 #
  44 # Switch the HEAD pointer to the new branch if it we
  45 # checked out a branch head, and remove any potential
  46 # old MERGE_HEAD's (subsequent commits will clearly not
  47 # be based on them, since we re-set the index)
  48 #
  49 if [ "$?" -eq 0 ]; then
  50         [ "$branch" ] && ln -sf "refs/heads/$branch" "$GIT_DIR/HEAD"
  51         rm -f "$GIT_DIR/MERGE_HEAD"
  52 fi