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-rwxr-xr-xgit-reset-script96
1 files changed, 90 insertions, 6 deletions
diff --git a/git-reset-script b/git-reset-script
index 7da8d86..863e2a9 100755
--- a/git-reset-script
+++ b/git-reset-script
@@ -1,13 +1,97 @@
#!/bin/sh
. git-sh-setup-script || die "Not a git archive"
+
+tmp=/var/tmp/reset.$$
+trap 'rm -f $tmp-*' 0 1 2 3 15
+
+reset_type=--mixed
+case "$1" in
+--mixed | --soft | --hard)
+ reset_type="$1"
+ shift
+ ;;
+esac
+
rev=$(git-rev-parse --verify --default HEAD "$@") || exit
rev=$(git-rev-parse --verify $rev^0) || exit
-git-read-tree --reset "$rev" && {
- if orig=$(git-rev-parse --verify HEAD 2>/dev/null)
+
+# We need to remember the set of paths that _could_ be left
+# behind before a hard reset, so that we can remove them.
+if test "$reset_type" = "--hard"
+then
+ {
+ git-ls-files --stage -z
+ git-rev-parse --verify HEAD 2>/dev/null &&
+ git-ls-tree -r -z HEAD
+ } | perl -e '
+ use strict;
+ my %seen;
+ $/ = "\0";
+ while (<>) {
+ chomp;
+ my ($info, $path) = split(/\t/, $_);
+ next if ($info =~ / tree /);
+ if (!$seen{$path}) {
+ $seen{$path} = 1;
+ print "$path\0";
+ }
+ }
+ ' >$tmp-exists
+fi
+
+# Soft reset does not touch the index file nor the working tree
+# at all, but requires them in a good order. Other resets reset
+# the index file to the tree object we are switching to.
+if test "$reset_type" = "--soft"
+then
+ if test -f "$GIT_DIR/MERGE_HEAD" ||
+ test "" != "$(git-ls-files --unmerged)"
then
- echo "$orig" >"$GIT_DIR/ORIG_HEAD"
+ die "Cannot do a soft reset in the middle of a merge."
fi
- echo "$rev" > "$GIT_DIR/HEAD"
-}
-git-update-cache --refresh
+else
+ git-read-tree --reset "$rev" || exit
+fi
+
+# Any resets update HEAD to the head being switched to.
+if orig=$(git-rev-parse --verify HEAD 2>/dev/null)
+then
+ echo "$orig" >"$GIT_DIR/ORIG_HEAD"
+else
+ rm -f "$GIT_DIR/ORIG_HEAD"
+fi
+echo "$rev" >"$GIT_DIR/HEAD"
+
+case "$reset_type" in
+--hard )
+ # Hard reset matches the working tree to that of the tree
+ # being switched to.
+ git-checkout-cache -f -u -q -a
+ git-ls-files --cached -z |
+ perl -e '
+ use strict;
+ my (%keep, $fh);
+ $/ = "\0";
+ while (<STDIN>) {
+ chomp;
+ $keep{$_} = 1;
+ }
+ open $fh, "<", $ARGV[0]
+ or die "cannot open $ARGV[0]";
+ while (<$fh>) {
+ chomp;
+ if (! exists $keep{$_}) {
+ print "$_\0";
+ }
+ }
+ ' $tmp-exists | xargs -0 rm -v -f --
+ ;;
+--soft )
+ ;; # Nothing else to do
+--mixed )
+ # Report what has not been updated.
+ git-update-cache --refresh
+ ;;
+esac
+
rm -f "$GIT_DIR/MERGE_HEAD"