contrib/examples/git-reset.sh

   1 #!/bin/sh
   2 #
   3 # Copyright (c) 2005, 2006 Linus Torvalds and Junio C Hamano
   4 #
   5 USAGE='[--mixed | --soft | --hard]  [<commit-ish>] [ [--] <paths>...]'
   6 SUBDIRECTORY_OK=Yes
   7 . git-sh-setup
   8 set_reflog_action "reset $*"
   9 require_work_tree
  10
  11 update= reset_type=--mixed
  12 unset rev
  13
  14 while test $# != 0
  15 do
  16         case "$1" in
  17         --mixed | --soft | --hard)
  18                 reset_type="$1"
  19                 ;;
  20         --)
  21                 break
  22                 ;;
  23         -*)
  24                 usage
  25                 ;;
  26         *)
  27                 rev=$(git rev-parse --verify "$1") || exit
  28                 shift
  29                 break
  30                 ;;
  31         esac
  32         shift
  33 done
  34
  35 : ${rev=HEAD}
  36 rev=$(git rev-parse --verify $rev^0) || exit
  37
  38 # Skip -- in "git reset HEAD -- foo" and "git reset -- foo".
  39 case "$1" in --) shift ;; esac
  40
  41 # git reset --mixed tree [--] paths... can be used to
  42 # load chosen paths from the tree into the index without
  43 # affecting the working tree nor HEAD.
  44 if test $# != 0
  45 then
  46         test "$reset_type" = "--mixed" ||
  47                 die "Cannot do partial $reset_type reset."
  48
  49         git diff-index --cached $rev -- "$@" |
  50         sed -e 's/^:\([0-7][0-7]*\) [0-7][0-7]* \([0-9a-f][0-9a-f]*\) [0-9a-f][0-9a-f]* [A-Z]   \(.*\)$/\1 \2   \3/' |
  51         git update-index --add --remove --index-info || exit
  52         git update-index --refresh
  53         exit
  54 fi
  55
  56 cd_to_toplevel
  57
  58 if test "$reset_type" = "--hard"
  59 then
  60         update=-u
  61 fi
  62
  63 # Soft reset does not touch the index file nor the working tree
  64 # at all, but requires them in a good order.  Other resets reset
  65 # the index file to the tree object we are switching to.
  66 if test "$reset_type" = "--soft"
  67 then
  68         if test -f "$GIT_DIR/MERGE_HEAD" ||
  69            test "" != "$(git ls-files --unmerged)"
  70         then
  71                 die "Cannot do a soft reset in the middle of a merge."
  72         fi
  73 else
  74         git read-tree -v --reset $update "$rev" || exit
  75 fi
  76
  77 # Any resets update HEAD to the head being switched to.
  78 if orig=$(git rev-parse --verify HEAD 2>/dev/null)
  79 then
  80         echo "$orig" >"$GIT_DIR/ORIG_HEAD"
  81 else
  82         rm -f "$GIT_DIR/ORIG_HEAD"
  83 fi
  84 git update-ref -m "$GIT_REFLOG_ACTION" HEAD "$rev"
  85 update_ref_status=$?
  86
  87 case "$reset_type" in
  88 --hard )
  89         test $update_ref_status = 0 && {
  90                 printf "HEAD is now at "
  91                 GIT_PAGER= git log --max-count=1 --pretty=oneline \
  92                         --abbrev-commit HEAD
  93         }
  94         ;;
  95 --soft )
  96         ;; # Nothing else to do
  97 --mixed )
  98         # Report what has not been updated.
  99         git update-index --refresh
 100         ;;
 101 esac
 102
 103 rm -f "$GIT_DIR/MERGE_HEAD" "$GIT_DIR/rr-cache/MERGE_RR" \
 104         "$GIT_DIR/SQUASH_MSG" "$GIT_DIR/MERGE_MSG"
 105
 106 exit $update_ref_status