git-reset.sh

   1 #!/bin/sh
   2 . git-sh-setup || die "Not a git archive"
   3
   4 tmp=/var/tmp/reset.$$
   5 trap 'rm -f $tmp-*' 0 1 2 3 15
   6
   7 reset_type=--mixed
   8 case "$1" in
   9 --mixed | --soft | --hard)
  10         reset_type="$1"
  11         shift
  12         ;;
  13 esac
  14
  15 rev=$(git-rev-parse --verify --default HEAD "$@") || exit
  16 rev=$(git-rev-parse --verify $rev^0) || exit
  17
  18 # We need to remember the set of paths that _could_ be left
  19 # behind before a hard reset, so that we can remove them.
  20 if test "$reset_type" = "--hard"
  21 then
  22         {
  23                 git-ls-files --stage -z
  24                 git-rev-parse --verify HEAD 2>/dev/null &&
  25                 git-ls-tree -r -z HEAD
  26         } | perl -e '
  27             use strict;
  28             my %seen;
  29             $/ = "\0";
  30             while (<>) {
  31                 chomp;
  32                 my ($info, $path) = split(/\t/, $_);
  33                 next if ($info =~ / tree /);
  34                 if (!$seen{$path}) {
  35                         $seen{$path} = 1;
  36                         print "$path\0";
  37                 }
  38             }
  39         ' >$tmp-exists
  40 fi
  41
  42 # Soft reset does not touch the index file nor the working tree
  43 # at all, but requires them in a good order.  Other resets reset
  44 # the index file to the tree object we are switching to.
  45 if test "$reset_type" = "--soft"
  46 then
  47         if test -f "$GIT_DIR/MERGE_HEAD" ||
  48            test "" != "$(git-ls-files --unmerged)"
  49         then
  50                 die "Cannot do a soft reset in the middle of a merge."
  51         fi
  52 else
  53         git-read-tree --reset "$rev" || exit
  54 fi
  55
  56 # Any resets update HEAD to the head being switched to.
  57 if orig=$(git-rev-parse --verify HEAD 2>/dev/null)
  58 then
  59         echo "$orig" >"$GIT_DIR/ORIG_HEAD"
  60 else
  61         rm -f "$GIT_DIR/ORIG_HEAD"
  62 fi
  63 echo "$rev" >"$GIT_DIR/HEAD"
  64
  65 case "$reset_type" in
  66 --hard )
  67         # Hard reset matches the working tree to that of the tree
  68         # being switched to.
  69         git-checkout-index -f -u -q -a
  70         git-ls-files --cached -z |
  71         perl -e '
  72                 use strict;
  73                 my (%keep, $fh);
  74                 $/ = "\0";
  75                 while (<STDIN>) {
  76                         chomp;
  77                         $keep{$_} = 1;
  78                 }
  79                 open $fh, "<", $ARGV[0]
  80                         or die "cannot open $ARGV[0]";
  81                 while (<$fh>) {
  82                         chomp;
  83                         if (! exists $keep{$_}) {
  84                                 print "$_\0";
  85                         }
  86                 }
  87         ' $tmp-exists | xargs -0 rm -v -f --
  88         ;;
  89 --soft )
  90         ;; # Nothing else to do
  91 --mixed )
  92         # Report what has not been updated.
  93         git-update-index --refresh
  94         ;;
  95 esac
  96
  97 rm -f "$GIT_DIR/MERGE_HEAD"