1#!/bin/sh 2. git-sh-setup|| die "Not a git archive" 3 4tmp=/var/tmp/reset.$$ 5trap'rm -f$tmp-*'0 1 2 3 15 6 7reset_type=--mixed 8case"$1"in 9--mixed|--soft|--hard) 10 reset_type="$1" 11shift 12;; 13esac 14 15rev=$(git-rev-parse --verify --default HEAD "$@")||exit 16rev=$(git-rev-parse --verify $rev^0)||exit 17 18# We need to remember the set of paths that _could_ be left 19# behind before a hard reset, so that we can remove them. 20iftest"$reset_type"="--hard" 21then 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 '>$tmp-exists 40fi 41 42# Soft reset does not touch the index file nor the working tree 43# at all, but requires them in a good order. Other resets reset 44# the index file to the tree object we are switching to. 45iftest"$reset_type"="--soft" 46then 47iftest -f"$GIT_DIR/MERGE_HEAD"|| 48test""!="$(git-ls-files --unmerged)" 49then 50 die "Cannot do a soft reset in the middle of a merge." 51fi 52else 53 git-read-tree --reset"$rev"||exit 54fi 55 56# Any resets update HEAD to the head being switched to. 57if orig=$(git-rev-parse --verify HEAD 2>/dev/null) 58then 59echo"$orig">"$GIT_DIR/ORIG_HEAD" 60else 61rm-f"$GIT_DIR/ORIG_HEAD" 62fi 63echo"$rev">"$GIT_DIR/HEAD" 64 65case"$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 '$tmp-exists|xargs-0rm-f -- 88;; 89--soft) 90;;# Nothing else to do 91--mixed) 92# Report what has not been updated. 93 git-update-index --refresh 94;; 95esac 96 97rm-f"$GIT_DIR/MERGE_HEAD"