diff --git a/Documentation/RelNotes-1.6.6.txt b/Documentation/RelNotes-1.6.6.txt
index b9e864238a..04e205c457 100644
--- a/Documentation/RelNotes-1.6.6.txt
+++ b/Documentation/RelNotes-1.6.6.txt
@@ -22,10 +22,10 @@ These changes were discussed long time ago and existing behaviours have
 been identified as more problematic to the userbase than keeping them for
 the sake of backward compatibility.
 
-When necessary, transition strategy for existing users has been designed
+When necessary, a transition strategy for existing users has been designed
 not to force them running around setting configuration variables and
 updating their scripts in order to either keep the traditional behaviour
-or adjust to the new behaviour on the day their sysadmin decides to install
+or adjust to the new behaviour, on the day their sysadmin decides to install
 the new version of git.  When we switched from "git-foo" to "git foo" in
 1.6.0, even though the change had been advertised and the transition
 guide had been provided for a very long time, the users procrastinated
@@ -34,11 +34,12 @@ their sysadmins updated their git installation.  We are trying to avoid
 repeating that unpleasantness in the 1.7.0 release.
 
 For changes decided to be in 1.7.0, commands that will be affected
-have been much louder to strongly discourage such procrastination.  If
-you have been using recent versions of git, you would have seen
-warnings issued when you exercised features whose behaviour will
-change, with a clear instruction on how to keep the existing behaviour
-if you want to.  You hopefully are already well prepared.
+have been much louder to strongly discourage such procrastination, and
+they continue to be in this release.  If you have been using recent
+versions of git, you would have seen warnings issued when you used
+features whose behaviour will change, with a clear instruction on how
+to keep the existing behaviour if you want to.  You hopefully are
+already well prepared.
 
 Of course, we have also been giving "this and that will change in
 1.7.0; prepare yourselves" warnings in the release notes and
@@ -208,15 +209,14 @@ Updates since v1.6.5
 
  * "git svn" learned to read SVN 1.5+ and SVK merge tickets.
 
+ * "git svn" learned to recreate empty directories tracked only by SVN.
+
  * "gitweb" can optionally render its "blame" output incrementally (this
    requires JavaScript on the client side).
 
  * Author names shown in gitweb output are links to search commits by the
    author.
 
-
-(developers)
-
 Fixes since v1.6.5
 ------------------
 
diff --git a/Documentation/git.txt b/Documentation/git.txt
index 51ca39291f..352c23019f 100644
--- a/Documentation/git.txt
+++ b/Documentation/git.txt
@@ -43,6 +43,11 @@ unreleased) version of git, that is available from 'master'
 branch of the `git.git` repository.
 Documentation for older releases are available here:
 
+* link:v1.6.6/git.html[documentation for release 1.6.6]
+
+* release notes for
+  link:RelNotes-1.6.6.txt[1.6.6].
+
 * link:v1.6.5.7/git.html[documentation for release 1.6.5.7]
 
 * release notes for
diff --git a/Documentation/technical/api-hash.txt b/Documentation/technical/api-hash.txt
index c784d3edcb..e5061e0677 100644
--- a/Documentation/technical/api-hash.txt
+++ b/Documentation/technical/api-hash.txt
@@ -1,6 +1,52 @@
 hash API
 ========
 
-Talk about <hash.h>
+The hash API is a collection of simple hash table functions. Users are expected
+to implement their own hashing.
 
-(Linus)
+Data Structures
+---------------
+
+`struct hash_table`::
+
+	The hash table structure. The `array` member points to the hash table
+	entries. The `size` member counts the total number of valid and invalid
+	entries in the table. The `nr` member keeps track of the number of
+	valid entries.
+
+`struct hash_table_entry`::
+
+	An opaque structure representing an entry in the hash table. The `hash`
+	member is the entry's hash key and the `ptr` member is the entry's
+	value.
+
+Functions
+---------
+
+`init_hash`::
+
+	Initialize the hash table.
+
+`free_hash`::
+
+	Release memory associated with the hash table.
+
+`insert_hash`::
+
+	Insert a pointer into the hash table. If an entry with that hash
+	already exists, a pointer to the existing entry's value is returned.
+	Otherwise NULL is returned.  This allows callers to implement
+	chaining, etc.
+
+`lookup_hash`::
+
+	Lookup an entry in the hash table. If an entry with that hash exists
+	the entry's value is returned. Otherwise NULL is returned.
+
+`for_each_hash`::
+
+	Call a function for each entry in the hash table. The function is
+	expected to take the entry's value as its only argument and return an
+	int. If the function returns a negative int the loop is aborted
+	immediately.  Otherwise, the return value is accumulated and the sum
+	returned upon completion of the loop.
diff --git a/Documentation/technical/api-strbuf.txt b/Documentation/technical/api-strbuf.txt
index 7438149249..a0e0f850f8 100644
--- a/Documentation/technical/api-strbuf.txt
+++ b/Documentation/technical/api-strbuf.txt
@@ -12,7 +12,7 @@ strbuf API actually relies on the string being free of NULs.
 
 strbufs has some invariants that are very important to keep in mind:
 
-. The `buf` member is never NULL, so you it can be used in any usual C
+. The `buf` member is never NULL, so it can be used in any usual C
 string operations safely. strbuf's _have_ to be initialized either by
 `strbuf_init()` or by `= STRBUF_INIT` before the invariants, though.
 +
@@ -55,7 +55,7 @@ Data structures
 
 * `struct strbuf`
 
-This is string buffer structure. The `len` member can be used to
+This is the string buffer structure. The `len` member can be used to
 determine the current length of the string, and `buf` member provides access to
 the string itself.
 
@@ -253,3 +253,9 @@ same behaviour as well.
 	comments are considered contents to be removed or not.
 
 `launch_editor`::
+
+	Launch the user preferred editor to edit a file and fill the buffer
+	with the file's contents upon the user completing their editing. The
+	third argument can be used to set the environment which the editor is
+	run in. If the buffer is NULL the editor is launched as usual but the
+	file's contents are not read into the buffer upon completion.
diff --git a/GIT-VERSION-GEN b/GIT-VERSION-GEN
index 039e8d427c..1628d986fe 100755
--- a/GIT-VERSION-GEN
+++ b/GIT-VERSION-GEN
@@ -1,7 +1,7 @@
 #!/bin/sh
 
 GVF=GIT-VERSION-FILE
-DEF_VER=v1.6.6-rc3.GIT
+DEF_VER=v1.6.6
 
 LF='
 '
diff --git a/builtin-blame.c b/builtin-blame.c
index d4e25a595d..6408ec8ee6 100644
--- a/builtin-blame.c
+++ b/builtin-blame.c
@@ -1305,6 +1305,7 @@ static void get_ac_line(const char *inbuf, const char *what,
 	error_out:
 		/* Ugh */
 		*tz = "(unknown)";
+		strcpy(person, *tz);
 		strcpy(mail, *tz);
 		*time = 0;
 		return;
@@ -1314,20 +1315,26 @@ static void get_ac_line(const char *inbuf, const char *what,
 	tmp = person;
 	tmp += len;
 	*tmp = 0;
-	while (*tmp != ' ')
+	while (person < tmp && *tmp != ' ')
 		tmp--;
+	if (tmp <= person)
+		goto error_out;
 	*tz = tmp+1;
 	tzlen = (person+len)-(tmp+1);
 
 	*tmp = 0;
-	while (*tmp != ' ')
+	while (person < tmp && *tmp != ' ')
 		tmp--;
+	if (tmp <= person)
+		goto error_out;
 	*time = strtoul(tmp, NULL, 10);
 	timepos = tmp;
 
 	*tmp = 0;
-	while (*tmp != ' ')
+	while (person < tmp && *tmp != ' ')
 		tmp--;
+	if (tmp <= person)
+		return;
 	mailpos = tmp + 1;
 	*tmp = 0;
 	maillen = timepos - tmp;
diff --git a/git-rebase--interactive.sh b/git-rebase--interactive.sh
index 0bd3bf78b8..d52932878c 100755
--- a/git-rebase--interactive.sh
+++ b/git-rebase--interactive.sh
@@ -779,7 +779,7 @@ EOF
 
 		cp "$TODO" "$TODO".backup
 		git_editor "$TODO" ||
-			die "Could not execute editor"
+			die_abort "Could not execute editor"
 
 		has_action "$TODO" ||
 			die_abort "Nothing to do"
diff --git a/git-svn.perl b/git-svn.perl
index a4b052c71e..650c9e5f02 100755
--- a/git-svn.perl
+++ b/git-svn.perl
@@ -663,7 +663,8 @@ sub cmd_branch {
 	}
 	$head ||= 'HEAD';
 
-	my ($src, $rev, undef, $gs) = working_head_info($head);
+	my (undef, $rev, undef, $gs) = working_head_info($head);
+	my $src = $gs->full_url;
 
 	my $remote = Git::SVN::read_all_remotes()->{$gs->{repo_id}};
 	my $allglobs = $remote->{ $_tag ? 'tags' : 'branches' };
@@ -1634,6 +1635,7 @@ use Carp qw/croak/;
 use File::Path qw/mkpath/;
 use File::Copy qw/copy/;
 use IPC::Open3;
+use Memoize;  # core since 5.8.0, Jul 2002
 
 my ($_gc_nr, $_gc_period);
 
@@ -1741,7 +1743,11 @@ sub fetch_all {
 	my $ra = Git::SVN::Ra->new($url);
 	my $uuid = $ra->get_uuid;
 	my $head = $ra->get_latest_revnum;
-	$ra->get_log("", $head, 0, 1, 0, 1, sub { $head = $_[1] });
+
+	# ignore errors, $head revision may not even exist anymore
+	eval { $ra->get_log("", $head, 0, 1, 0, 1, sub { $head = $_[1] }) };
+	warn "W: $@\n" if $@;
+
 	my $base = defined $fetch ? $head : 0;
 
 	# read the max revs for wildcard expansion (branches/*, tags/*)
@@ -2446,12 +2452,6 @@ sub get_commit_parents {
 		next if $seen{$p};
 		$seen{$p} = 1;
 		push @ret, $p;
-		# MAXPARENT is defined to 16 in commit-tree.c:
-		last if @ret >= 16;
-	}
-	if (@tmp) {
-		die "r$log_entry->{revision}: No room for parents:\n\t",
-		    join("\n\t", @tmp), "\n";
 	}
 	@ret;
 }
@@ -2740,21 +2740,44 @@ sub do_fetch {
 
 sub mkemptydirs {
 	my ($self, $r) = @_;
-	my %empty_dirs = ();
 
-	open my $fh, '<', "$self->{dir}/unhandled.log" or return;
-	binmode $fh or croak "binmode: $!";
-	while (<$fh>) {
-		if (defined $r && /^r(\d+)$/) {
-			last if $1 > $r;
-		} elsif (/^  \+empty_dir: (.+)$/) {
-			$empty_dirs{$1} = 1;
-		} elsif (/^  \-empty_dir: (.+)$/) {
-			my @d = grep {m[^\Q$1\E(/|$)]} (keys %empty_dirs);
-			delete @empty_dirs{@d};
+	sub scan {
+		my ($r, $empty_dirs, $line) = @_;
+		if (defined $r && $line =~ /^r(\d+)$/) {
+			return 0 if $1 > $r;
+		} elsif ($line =~ /^  \+empty_dir: (.+)$/) {
+			$empty_dirs->{$1} = 1;
+		} elsif ($line =~ /^  \-empty_dir: (.+)$/) {
+			my @d = grep {m[^\Q$1\E(/|$)]} (keys %$empty_dirs);
+			delete @$empty_dirs{@d};
+		}
+		1; # continue
+	};
+
+	my %empty_dirs = ();
+	my $gz_file = "$self->{dir}/unhandled.log.gz";
+	if (-f $gz_file) {
+		if (!$can_compress) {
+			warn "Compress::Zlib could not be found; ",
+			     "empty directories in $gz_file will not be read\n";
+		} else {
+			my $gz = Compress::Zlib::gzopen($gz_file, "rb") or
+				die "Unable to open $gz_file: $!\n";
+			my $line;
+			while ($gz->gzreadline($line) > 0) {
+				scan($r, \%empty_dirs, $line) or last;
+			}
+			$gz->gzclose;
 		}
 	}
-	close $fh;
+
+	if (open my $fh, '<', "$self->{dir}/unhandled.log") {
+		binmode $fh or croak "binmode: $!";
+		while (<$fh>) {
+			scan($r, \%empty_dirs, $_) or last;
+		}
+		close $fh;
+	}
 
 	my $strip = qr/\A\Q$self->{path}\E(?:\/|$)/;
 	foreach my $d (sort keys %empty_dirs) {
@@ -2967,6 +2990,111 @@ sub find_extra_svk_parents {
 	}
 }
 
+sub lookup_svn_merge {
+	my $uuid = shift;
+	my $url = shift;
+	my $merge = shift;
+
+	my ($source, $revs) = split ":", $merge;
+	my $path = $source;
+	$path =~ s{^/}{};
+	my $gs = Git::SVN->find_by_url($url.$source, $url, $path);
+	if ( !$gs ) {
+		warn "Couldn't find revmap for $url$source\n";
+		return;
+	}
+	my @ranges = split ",", $revs;
+	my ($tip, $tip_commit);
+	my @merged_commit_ranges;
+	# find the tip
+	for my $range ( @ranges ) {
+		my ($bottom, $top) = split "-", $range;
+		$top ||= $bottom;
+		my $bottom_commit = $gs->find_rev_after( $bottom, 1, $top );
+		my $top_commit = $gs->find_rev_before( $top, 1, $bottom );
+
+		unless ($top_commit and $bottom_commit) {
+			warn "W:unknown path/rev in svn:mergeinfo "
+				."dirprop: $source:$range\n";
+			next;
+		}
+
+		push @merged_commit_ranges,
+			"$bottom_commit^..$top_commit";
+
+		if ( !defined $tip or $top > $tip ) {
+			$tip = $top;
+			$tip_commit = $top_commit;
+		}
+	}
+	return ($tip_commit, @merged_commit_ranges);
+}
+
+sub _rev_list {
+	my ($msg_fh, $ctx) = command_output_pipe(
+		"rev-list", @_,
+	       );
+	my @rv;
+	while ( <$msg_fh> ) {
+		chomp;
+		push @rv, $_;
+	}
+	command_close_pipe($msg_fh, $ctx);
+	@rv;
+}
+
+sub check_cherry_pick {
+	my $base = shift;
+	my $tip = shift;
+	my @ranges = @_;
+	my %commits = map { $_ => 1 }
+		_rev_list("--no-merges", $tip, "--not", $base);
+	for my $range ( @ranges ) {
+		delete @commits{_rev_list($range)};
+	}
+	return (keys %commits);
+}
+
+BEGIN {
+	memoize 'lookup_svn_merge';
+	memoize 'check_cherry_pick';
+}
+
+sub parents_exclude {
+	my $parents = shift;
+	my @commits = @_;
+	return unless @commits;
+
+	my @excluded;
+	my $excluded;
+	do {
+		my @cmd = ('rev-list', "-1", @commits, "--not", @$parents );
+		$excluded = command_oneline(@cmd);
+		if ( $excluded ) {
+			my @new;
+			my $found;
+			for my $commit ( @commits ) {
+				if ( $commit eq $excluded ) {
+					push @excluded, $commit;
+					$found++;
+					last;
+				}
+				else {
+					push @new, $commit;
+				}
+			}
+			die "saw commit '$excluded' in rev-list output, "
+				."but we didn't ask for that commit (wanted: @commits --not @$parents)"
+					unless $found;
+			@commits = @new;
+		}
+	}
+		while ($excluded and @commits);
+
+	return @excluded;
+}
+
+
 # note: this function should only be called if the various dirprops
 # have actually changed
 sub find_extra_svn_parents {
@@ -2979,82 +3107,73 @@ sub find_extra_svn_parents {
 	# are now marked as merge, we can add the tip as a parent.
 	my @merges = split "\n", $mergeinfo;
 	my @merge_tips;
-	my @merged_commit_ranges;
 	my $url = $self->rewrite_root || $self->{url};
+	my $uuid = $self->ra_uuid;
+	my %ranges;
 	for my $merge ( @merges ) {
-		my ($source, $revs) = split ":", $merge;
-		my $path = $source;
-		$path =~ s{^/}{};
-		my $gs = Git::SVN->find_by_url($url.$source, $url, $path);
-		if ( !$gs ) {
-			warn "Couldn't find revmap for $url$source\n";
-			next;
-		}
-		my @ranges = split ",", $revs;
-		my ($tip, $tip_commit);
-		# find the tip
-		for my $range ( @ranges ) {
-			my ($bottom, $top) = split "-", $range;
-			$top ||= $bottom;
-			my $bottom_commit =
-				$gs->rev_map_get($bottom, $self->ra_uuid) ||
-				$gs->rev_map_get($bottom+1, $self->ra_uuid);
-			my $top_commit;
-			for (; !$top_commit && $top >= $bottom; --$top) {
-				$top_commit =
-					$gs->rev_map_get($top, $self->ra_uuid);
-			}
-
-			unless ($top_commit and $bottom_commit) {
-				warn "W:unknown path/rev in svn:mergeinfo "
-					."dirprop: $source:$range\n";
-				next;
-			}
-
-			push @merged_commit_ranges,
-				"$bottom_commit..$top_commit";
-
-			if ( !defined $tip or $top > $tip ) {
-				$tip = $top;
-				$tip_commit = $top_commit;
-			}
-		}
+		my ($tip_commit, @ranges) =
+			lookup_svn_merge( $uuid, $url, $merge );
 		unless (!$tip_commit or
 				grep { $_ eq $tip_commit } @$parents ) {
 			push @merge_tips, $tip_commit;
+			$ranges{$tip_commit} = \@ranges;
 		} else {
 			push @merge_tips, undef;
 		}
 	}
+
+	my %excluded = map { $_ => 1 }
+		parents_exclude($parents, grep { defined } @merge_tips);
+
+	# check merge tips for new parents
+	my @new_parents;
 	for my $merge_tip ( @merge_tips ) {
 		my $spec = shift @merges;
-		next unless $merge_tip;
-		my @cmd = ('rev-list', "-1", $merge_tip,
-			   "--not", @$parents );
-		my ($msg_fh, $ctx) = command_output_pipe(@cmd);
-		my $new;
-		while ( <$msg_fh> ) {
-			$new=1;last;
+		next unless $merge_tip and $excluded{$merge_tip};
+
+		my $ranges = $ranges{$merge_tip};
+
+		# check out 'new' tips
+		my $merge_base = command_oneline(
+			"merge-base",
+			@$parents, $merge_tip,
+		       );
+
+		# double check that there are no missing non-merge commits
+		my (@incomplete) = check_cherry_pick(
+			$merge_base, $merge_tip,
+			@$ranges,
+		       );
+
+		if ( @incomplete ) {
+			warn "W:svn cherry-pick ignored ($spec) - missing "
+				.@incomplete." commit(s) (eg $incomplete[0])\n";
+		} else {
+			warn
+				"Found merge parent (svn:mergeinfo prop): ",
+					$merge_tip, "\n";
+			push @new_parents, $merge_tip;
 		}
-		command_close_pipe($msg_fh, $ctx);
-		if ( $new ) {
-			push @cmd, @merged_commit_ranges;
-			my ($msg_fh, $ctx) = command_output_pipe(@cmd);
-			my $unmerged;
-			while ( <$msg_fh> ) {
-				$unmerged=1;last;
-			}
-			command_close_pipe($msg_fh, $ctx);
-			if ( $unmerged ) {
-				warn "W:svn cherry-pick ignored ($spec)\n";
-			} else {
-				warn
-				  "Found merge parent (svn:mergeinfo prop): ",
-				  $merge_tip, "\n";
-				push @$parents, $merge_tip;
+	}
+
+	# cater for merges which merge commits from multiple branches
+	if ( @new_parents > 1 ) {
+		for ( my $i = 0; $i <= $#new_parents; $i++ ) {
+			for ( my $j = 0; $j <= $#new_parents; $j++ ) {
+				next if $i == $j;
+				next unless $new_parents[$i];
+				next unless $new_parents[$j];
+				my $revs = command_oneline(
+					"rev-list", "-1",
+					"$new_parents[$i]..$new_parents[$j]",
+				       );
+				if ( !$revs ) {
+					undef($new_parents[$i]);
+				}
 			}
 		}
 	}
+	push @$parents, grep { defined } @new_parents;
 }
 
 sub make_log_entry {
diff --git a/t/t8003-blame.sh b/t/t8003-blame.sh
index 13c25f1d52..ad834f200a 100755
--- a/t/t8003-blame.sh
+++ b/t/t8003-blame.sh
@@ -144,4 +144,17 @@ test_expect_success 'blame path that used to be a directory' '
 	git blame HEAD^.. -- path
 '
 
+test_expect_success 'blame to a commit with no author name' '
+  TREE=`git rev-parse HEAD:`
+  cat >badcommit <<EOF
+tree $TREE
+author <noname> 1234567890 +0000
+committer David Reiss <dreiss@facebook.com> 1234567890 +0000
+
+some message
+EOF
+  COMMIT=`git hash-object -t commit -w badcommit`
+  git --no-pager blame $COMMIT -- uno >/dev/null
+'
+
 test_done
diff --git a/t/t9146-git-svn-empty-dirs.sh b/t/t9146-git-svn-empty-dirs.sh
index 9b8d0463fa..565365cbd3 100755
--- a/t/t9146-git-svn-empty-dirs.sh
+++ b/t/t9146-git-svn-empty-dirs.sh
@@ -114,5 +114,29 @@ test_expect_success 'removed top-level directory does not exist' '
 	test ! -e removed/d
 
 '
+unhandled=.git/svn/refs/remotes/git-svn/unhandled.log
+test_expect_success 'git svn gc-ed files work' '
+	(
+		cd removed &&
+		git svn gc &&
+		: Compress::Zlib may not be available &&
+		if test -f "$unhandled".gz
+		then
+			svn_cmd mkdir -m gz "$svnrepo"/gz &&
+			git reset --hard $(git rev-list HEAD | tail -1) &&
+			git svn rebase &&
+			test -f "$unhandled".gz &&
+			test -f "$unhandled" &&
+			for i in a b c "weird file name" gz "! !"
+			do
+				if ! test -d "$i"
+				then
+					echo >&2 "$i does not exist"
+					exit 1
+				fi
+			done
+		fi
+	)
+'
 
 test_done
diff --git a/t/t9151-svn-mergeinfo.sh b/t/t9151-svn-mergeinfo.sh
index f57daf401a..359eeaa738 100755
--- a/t/t9151-svn-mergeinfo.sh
+++ b/t/t9151-svn-mergeinfo.sh
@@ -15,12 +15,27 @@ test_expect_success 'load svn dump' "
 	git svn fetch --all
 	"
 
-test_expect_success 'represent svn merges without intervening commits' "
-	[ `git cat-file commit HEAD^1 | grep parent | wc -l` -eq 2 ]
-	"
+test_expect_success 'all svn merges became git merge commits' '
+	unmarked=$(git rev-list --parents --all --grep=Merge |
+		grep -v " .* " | cut -f1 -d" ")
+	[ -z "$unmarked" ]
+	'
 
-test_expect_success 'represent svn merges with intervening commits' "
-	[ `git cat-file commit HEAD | grep parent | wc -l` -eq 2 ]
-	"
+test_expect_success 'cherry picks did not become git merge commits' '
+	bad_cherries=$(git rev-list --parents --all --grep=Cherry |
+		grep " .* " | cut -f1 -d" ")
+	[ -z "$bad_cherries" ]
+	'
+
+test_expect_success 'svn non-merge merge commits did not become git merge commits' '
+	bad_non_merges=$(git rev-list --parents --all --grep=non-merge |
+		grep " .* " | cut -f1 -d" ")
+	[ -z "$bad_non_merges" ]
+	'
+
+test_expect_success 'everything got merged in the end' '
+	unmerged=$(git rev-list --all --not master)
+	[ -z "$unmerged" ]
+	'
 
 test_done
diff --git a/t/t9151/make-svnmerge-dump b/t/t9151/make-svnmerge-dump
index 7e3da75f86..d917717cf3 100644
--- a/t/t9151/make-svnmerge-dump
+++ b/t/t9151/make-svnmerge-dump
@@ -11,93 +11,151 @@ mkdir foo.svn
 svnadmin create foo.svn
 svn co file://`pwd`/foo.svn foo
 
+commit() {
+    i=$(( $1 + 1 ))
+    shift;
+    svn commit -m "(r$i) $*" >/dev/null || exit 1
+    echo $i
+}
+
+say() {
+    echo " * $*"
+}
+
+i=0
 cd foo
 mkdir trunk
 mkdir branches
 svn add trunk branches
-svn commit -m "Setup trunk and branches"
-cd trunk
+i=$(commit $i "Setup trunk and branches")
 
-git cat-file blob 6683463e:Makefile > Makefile
-svn add Makefile 
+git cat-file blob 6683463e:Makefile > trunk/Makefile
+svn add trunk/Makefile 
 
-echo "Committing ANCESTOR"
-svn commit -m "ancestor"
-cd ..
+say "Committing ANCESTOR"
+i=$(commit $i "ancestor")
 svn cp trunk branches/left
 
-echo "Committing BRANCH POINT"
-svn commit -m "make left branch"
+say "Committing BRANCH POINT"
+i=$(commit $i "make left branch")
 svn cp trunk branches/right
 
-echo "Committing other BRANCH POINT"
-svn commit -m "make right branch"
-cd branches/left/
+say "Committing other BRANCH POINT"
+i=$(commit $i "make right branch")
 
-#$sm init
-#svn commit -m "init svnmerge"
+say "Committing LEFT UPDATE"
+git cat-file blob 5873b67e:Makefile > branches/left/Makefile
+i=$(commit $i "left update 1")
 
-git cat-file blob 5873b67e:Makefile > Makefile
-echo "Committing BRANCH UPDATE 1"
-svn commit -m "left update 1"
-cd ../..
+git cat-file blob 75118b13:Makefile > branches/right/Makefile
+say "Committing RIGHT UPDATE"
+pre_right_update_1=$i
+i=$(commit $i "right update 1")
 
-cd trunk
-git cat-file blob 75118b13:Makefile > Makefile
-echo "Committing TRUNK UPDATE"
-svn commit -m "trunk update"
+say "Making more commits on LEFT"
+git cat-file blob ff5ebe39:Makefile > branches/left/Makefile
+i=$(commit $i "left update 2")
+git cat-file blob b5039db6:Makefile > branches/left/Makefile
+i=$(commit $i "left update 3")
 
-cd ../branches/left
-git cat-file blob ff5ebe39:Makefile > Makefile
-echo "Committing BRANCH UPDATE 2"
-svn commit -m "left update 2"
+say "Making a LEFT SUB-BRANCH"
+svn cp branches/left branches/left-sub
+sub_left_make=$i
+i=$(commit $i "make left sub-branch")
 
-git cat-file blob b5039db6:Makefile > Makefile
-echo "Committing BRANCH UPDATE 3"
-svn commit -m "left update 3"
+say "Making a commit on LEFT SUB-BRANCH"
+echo "crunch" > branches/left-sub/README
+svn add branches/left-sub/README
+i=$(commit $i "left sub-branch update 1")
 
-# merge to trunk
-
-cd ../..
+say "Merging LEFT to TRUNK"
 svn update
 cd trunk
-
 svn merge ../branches/left --accept postpone
-
-git cat-file blob b51ad431:Makefile > Makefile
-
-svn resolved Makefile
-
-svn commit -m "Merge trunk 1"
-
-# create commits on both branches
-
-cd ../branches/left
-git cat-file blob ff5ebe39:Makefile > Makefile
-echo "Committing BRANCH UPDATE 4"
-svn commit -m "left update 4"
-
-cd ../right
 git cat-file blob b5039db6:Makefile > Makefile
-echo "Committing other BRANCH UPDATE 1"
-svn commit -m "right update 1"
+svn resolved Makefile
+i=$(commit $i "Merge left to trunk 1")
+cd ..
 
-# merge to trun again
+say "Making more commits on LEFT and RIGHT"
+echo "touche" > branches/left/zlonk
+svn add branches/left/zlonk
+i=$(commit $i "left update 4")
+echo "thwacke" > branches/right/bang
+svn add branches/right/bang
+i=$(commit $i "right update 2")
 
-cd ../..
+say "Squash merge of RIGHT tip 2 commits onto TRUNK"
 svn update
 cd trunk
+svn merge -r$pre_right_update_1:$i ../branches/right
+i=$(commit $i "Cherry-pick right 2 commits to trunk")
+cd ..
 
-svn merge ../branches/left --accept postpone
-
+say "Merging RIGHT to TRUNK"
+svn update
+cd trunk
+svn merge ../branches/right --accept postpone
 git cat-file blob b51ad431:Makefile > Makefile
-
 svn resolved Makefile
+i=$(commit $i "Merge right to trunk 1")
+cd ..
 
-svn commit -m "Merge trunk 2"
+say "Making more commits on RIGHT and TRUNK"
+echo "whamm" > branches/right/urkkk
+svn add branches/right/urkkk
+i=$(commit $i "right update 3")
+echo "pow" > trunk/vronk
+svn add trunk/vronk
+i=$(commit $i "trunk update 1")
 
+say "Merging RIGHT to LEFT SUB-BRANCH"
+svn update
+cd branches/left-sub
+svn merge ../right --accept postpone
+git cat-file blob b51ad431:Makefile > Makefile
+svn resolved Makefile
+i=$(commit $i "Merge right to left sub-branch")
 cd ../..
 
+say "Making more commits on LEFT SUB-BRANCH and LEFT"
+echo "zowie" > branches/left-sub/wham_eth
+svn add branches/left-sub/wham_eth
+pre_sub_left_update_2=$i
+i=$(commit $i "left sub-branch update 2")
+sub_left_update_2=$i
+echo "eee_yow" > branches/left/glurpp
+svn add branches/left/glurpp
+i=$(commit $i "left update 5")
+
+say "Cherry pick LEFT SUB-BRANCH commit to LEFT"
+svn update
+cd branches/left
+svn merge -r$pre_sub_left_update_2:$sub_left_update_2 ../left-sub
+i=$(commit $i "Cherry-pick left sub-branch commit to left")
+cd ../..
+
+say "Merging LEFT SUB-BRANCH back to LEFT"
+svn update
+cd branches/left
+# it's only a merge because the previous merge cherry-picked the top commit
+svn merge -r$sub_left_make:$sub_left_update_2 ../left-sub --accept postpone
+i=$(commit $i "Merge left sub-branch to left")
+cd ../..
+
+say "Merging EVERYTHING to TRUNK"
+svn update
+cd trunk
+svn merge ../branches/left --accept postpone
+svn resolved bang
+i=$(commit $i "Merge left to trunk 2")
+# this merge, svn happily updates the mergeinfo, but there is actually
+# nothing to merge.  git-svn will not make a meaningless merge commit.
+svn merge ../branches/right --accept postpone
+i=$(commit $i "non-merge right to trunk 2")
+cd ..
+
+cd ..
 svnadmin dump foo.svn > svn-mergeinfo.dump
 
 rm -rf foo foo.svn
diff --git a/t/t9151/svn-mergeinfo.dump b/t/t9151/svn-mergeinfo.dump
index 11a883fda9..9543e31c96 100644
--- a/t/t9151/svn-mergeinfo.dump
+++ b/t/t9151/svn-mergeinfo.dump
@@ -1,6 +1,6 @@
 SVN-fs-dump-format-version: 2
 
-UUID: 1530d5a2-a1dc-4438-8ad5-d95e96db8945
+UUID: 64142547-0943-4db2-836a-d1e1eb2f9924
 
 Revision-number: 0
 Prop-content-length: 56
@@ -9,25 +9,25 @@ Content-length: 56
 K 8
 svn:date
 V 27
-2009-11-12T20:29:38.812226Z
+2009-12-19T16:17:51.232640Z
 PROPS-END
 
 Revision-number: 1
-Prop-content-length: 127
-Content-length: 127
+Prop-content-length: 128
+Content-length: 128
 
 K 7
 svn:log
-V 24
-Setup trunk and branches
+V 29
+(r1) Setup trunk and branches
 K 10
 svn:author
-V 8
-tallsopp
+V 4
+samv
 K 8
 svn:date
 V 27
-2009-11-12T20:29:39.045856Z
+2009-12-19T16:17:51.831965Z
 PROPS-END
 
 Node-path: branches
@@ -49,21 +49,21 @@ PROPS-END
 
 
 Revision-number: 2
-Prop-content-length: 110
-Content-length: 110
+Prop-content-length: 112
+Content-length: 112
 
 K 7
 svn:log
-V 8
-ancestor
+V 13
+(r2) ancestor
 K 10
 svn:author
-V 8
-tallsopp
+V 4
+samv
 K 8
 svn:date
 V 27
-2009-11-12T20:29:40.079587Z
+2009-12-19T16:17:52.300075Z
 PROPS-END
 
 Node-path: trunk/Makefile
@@ -156,21 +156,21 @@ backup: clean
 
 
 Revision-number: 3
-Prop-content-length: 119
-Content-length: 119
+Prop-content-length: 120
+Content-length: 120
 
 K 7
 svn:log
-V 16
-make left branch
+V 21
+(r3) make left branch
 K 10
 svn:author
-V 8
-tallsopp
+V 4
+samv
 K 8
 svn:date
 V 27
-2009-11-12T20:29:42.084439Z
+2009-12-19T16:17:52.768800Z
 PROPS-END
 
 Node-path: branches/left
@@ -190,21 +190,21 @@ Text-copy-source-sha1: 103205ce331f7d64086dba497574734f78439590
 
 
 Revision-number: 4
-Prop-content-length: 120
-Content-length: 120
+Prop-content-length: 121
+Content-length: 121
 
 K 7
 svn:log
-V 17
-make right branch
+V 22
+(r4) make right branch
 K 10
 svn:author
-V 8
-tallsopp
+V 4
+samv
 K 8
 svn:date
 V 27
-2009-11-12T20:29:44.065452Z
+2009-12-19T16:17:53.177879Z
 PROPS-END
 
 Node-path: branches/right
@@ -224,21 +224,21 @@ Text-copy-source-sha1: 103205ce331f7d64086dba497574734f78439590
 
 
 Revision-number: 5
-Prop-content-length: 116
-Content-length: 116
+Prop-content-length: 117
+Content-length: 117
 
 K 7
 svn:log
-V 13
-left update 1
+V 18
+(r5) left update 1
 K 10
 svn:author
-V 8
-tallsopp
+V 4
+samv
 K 8
 svn:date
 V 27
-2009-11-12T20:29:45.066262Z
+2009-12-19T16:17:53.604691Z
 PROPS-END
 
 Node-path: branches/left/Makefile
@@ -329,24 +329,24 @@ backup: clean
 
 
 Revision-number: 6
-Prop-content-length: 115
-Content-length: 115
+Prop-content-length: 118
+Content-length: 118
 
 K 7
 svn:log
-V 12
-trunk update
+V 19
+(r6) right update 1
 K 10
 svn:author
-V 8
-tallsopp
+V 4
+samv
 K 8
 svn:date
 V 27
-2009-11-12T20:29:46.278498Z
+2009-12-19T16:17:54.063555Z
 PROPS-END
 
-Node-path: trunk/Makefile
+Node-path: branches/right/Makefile
 Node-kind: file
 Node-action: change
 Text-content-length: 2521
@@ -437,21 +437,21 @@ backup: clean
 
 
 Revision-number: 7
-Prop-content-length: 116
-Content-length: 116
+Prop-content-length: 117
+Content-length: 117
 
 K 7
 svn:log
-V 13
-left update 2
+V 18
+(r7) left update 2
 K 10
 svn:author
-V 8
-tallsopp
+V 4
+samv
 K 8
 svn:date
 V 27
-2009-11-12T20:29:47.069090Z
+2009-12-19T16:17:54.523904Z
 PROPS-END
 
 Node-path: branches/left/Makefile
@@ -542,21 +542,21 @@ backup: clean
 
 
 Revision-number: 8
-Prop-content-length: 116
-Content-length: 116
+Prop-content-length: 117
+Content-length: 117
 
 K 7
 svn:log
-V 13
-left update 3
+V 18
+(r8) left update 3
 K 10
 svn:author
-V 8
-tallsopp
+V 4
+samv
 K 8
 svn:date
 V 27
-2009-11-12T20:29:48.053835Z
+2009-12-19T16:17:54.975970Z
 PROPS-END
 
 Node-path: branches/left/Makefile
@@ -647,33 +647,285 @@ backup: clean
 
 
 Revision-number: 9
-Prop-content-length: 116
-Content-length: 116
+Prop-content-length: 124
+Content-length: 124
 
 K 7
 svn:log
-V 13
-Merge trunk 1
+V 25
+(r9) make left sub-branch
 K 10
 svn:author
-V 8
-tallsopp
+V 4
+samv
 K 8
 svn:date
 V 27
-2009-11-12T20:29:51.098306Z
+2009-12-19T16:17:55.459904Z
+PROPS-END
+
+Node-path: branches/left-sub
+Node-kind: dir
+Node-action: add
+Node-copyfrom-rev: 3
+Node-copyfrom-path: branches/left
+
+
+Node-path: branches/left-sub/Makefile
+Node-kind: file
+Node-action: delete
+
+Node-path: branches/left-sub/Makefile
+Node-kind: file
+Node-action: add
+Node-copyfrom-rev: 8
+Node-copyfrom-path: branches/left/Makefile
+Text-copy-source-md5: 5ccff689fb290e00b85fe18ee50c54ba
+Text-copy-source-sha1: a13de8e23f1483efca3e57b2b64b0ae6f740ce10
+
+
+
+
+Revision-number: 10
+Prop-content-length: 129
+Content-length: 129
+
+K 7
+svn:log
+V 30
+(r10) left sub-branch update 1
+K 10
+svn:author
+V 4
+samv
+K 8
+svn:date
+V 27
+2009-12-19T16:17:55.862113Z
+PROPS-END
+
+Node-path: branches/left-sub/README
+Node-kind: file
+Node-action: add
+Prop-content-length: 10
+Text-content-length: 7
+Text-content-md5: fdbcfb6be9afe1121862143f226b51cf
+Text-content-sha1: 1d1f5ea4ceb584337ffe59b8980d92e3b78dfef4
+Content-length: 17
+
+PROPS-END
+crunch
+
+
+Revision-number: 11
+Prop-content-length: 126
+Content-length: 126
+
+K 7
+svn:log
+V 27
+(r11) Merge left to trunk 1
+K 10
+svn:author
+V 4
+samv
+K 8
+svn:date
+V 27
+2009-12-19T16:17:56.413416Z
 PROPS-END
 
 Node-path: trunk
 Node-kind: dir
 Node-action: change
-Prop-content-length: 53
-Content-length: 53
+Prop-content-length: 54
+Content-length: 54
 
 K 13
 svn:mergeinfo
-V 18
-/branches/left:2-8
+V 19
+/branches/left:2-10
+PROPS-END
+
+
+Node-path: trunk/Makefile
+Node-kind: file
+Node-action: change
+Text-content-length: 2593
+Text-content-md5: 5ccff689fb290e00b85fe18ee50c54ba
+Text-content-sha1: a13de8e23f1483efca3e57b2b64b0ae6f740ce10
+Content-length: 2593
+
+# -DCOLLISION_CHECK if you believe that SHA1's
+# 1461501637330902918203684832716283019655932542976 hashes do not give you
+# enough guarantees about no collisions between objects ever hapenning.
+#
+# -DNSEC if you want git to care about sub-second file mtimes and ctimes.
+# Note that you need some new glibc (at least >2.2.4) for this, and it will
+# BREAK YOUR LOCAL DIFFS! show-diff and anything using it will likely randomly
+# break unless your underlying filesystem supports those sub-second times
+# (my ext3 doesn't).
+CFLAGS=-g -O3 -Wall
+
+CC=gcc
+
+
+PROG=   update-cache show-diff init-db write-tree read-tree commit-tree \
+	cat-file fsck-cache checkout-cache diff-tree rev-tree show-files \
+	check-files ls-tree merge-base
+
+all: $(PROG)
+
+install: $(PROG)
+	install $(PROG) $(HOME)/bin/
+
+LIBS= -lssl -lz
+
+init-db: init-db.o
+
+update-cache: update-cache.o read-cache.o
+	$(CC) $(CFLAGS) -o update-cache update-cache.o read-cache.o $(LIBS)
+
+show-diff: show-diff.o read-cache.o
+	$(CC) $(CFLAGS) -o show-diff show-diff.o read-cache.o $(LIBS)
+
+write-tree: write-tree.o read-cache.o
+	$(CC) $(CFLAGS) -o write-tree write-tree.o read-cache.o $(LIBS)
+
+read-tree: read-tree.o read-cache.o
+	$(CC) $(CFLAGS) -o read-tree read-tree.o read-cache.o $(LIBS)
+
+commit-tree: commit-tree.o read-cache.o
+	$(CC) $(CFLAGS) -o commit-tree commit-tree.o read-cache.o $(LIBS)
+
+cat-file: cat-file.o read-cache.o
+	$(CC) $(CFLAGS) -o cat-file cat-file.o read-cache.o $(LIBS)
+
+fsck-cache: fsck-cache.o read-cache.o object.o commit.o tree.o blob.o
+	$(CC) $(CFLAGS) -o fsck-cache fsck-cache.o read-cache.o object.o commit.o tree.o blob.o $(LIBS)
+
+checkout-cache: checkout-cache.o read-cache.o
+	$(CC) $(CFLAGS) -o checkout-cache checkout-cache.o read-cache.o $(LIBS)
+
+diff-tree: diff-tree.o read-cache.o
+	$(CC) $(CFLAGS) -o diff-tree diff-tree.o read-cache.o $(LIBS)
+
+rev-tree: rev-tree.o read-cache.o object.o commit.o tree.o blob.o
+	$(CC) $(CFLAGS) -o rev-tree rev-tree.o read-cache.o object.o commit.o tree.o blob.o $(LIBS)
+
+show-files: show-files.o read-cache.o
+	$(CC) $(CFLAGS) -o show-files show-files.o read-cache.o $(LIBS)
+
+check-files: check-files.o read-cache.o
+	$(CC) $(CFLAGS) -o check-files check-files.o read-cache.o $(LIBS)
+
+ls-tree: ls-tree.o read-cache.o
+	$(CC) $(CFLAGS) -o ls-tree ls-tree.o read-cache.o $(LIBS)
+
+merge-base: merge-base.o read-cache.o object.o commit.o tree.o blob.o
+	$(CC) $(CFLAGS) -o merge-base merge-base.o read-cache.o object.o commit.o tree.o blob.o $(LIBS)
+
+read-cache.o: cache.h
+show-diff.o: cache.h
+
+clean:
+	rm -f *.o $(PROG)
+
+backup: clean
+	cd .. ; tar czvf dircache.tar.gz dir-cache
+
+
+Revision-number: 12
+Prop-content-length: 118
+Content-length: 118
+
+K 7
+svn:log
+V 19
+(r12) left update 4
+K 10
+svn:author
+V 4
+samv
+K 8
+svn:date
+V 27
+2009-12-19T16:17:56.831014Z
+PROPS-END
+
+Node-path: branches/left/zlonk
+Node-kind: file
+Node-action: add
+Prop-content-length: 10
+Text-content-length: 7
+Text-content-md5: 8b9d8c7c2aaa6167e7d3407a773bbbba
+Text-content-sha1: 9716527ebd70a75c27625cacbeb2d897c6e86178
+Content-length: 17
+
+PROPS-END
+touche
+
+
+Revision-number: 13
+Prop-content-length: 119
+Content-length: 119
+
+K 7
+svn:log
+V 20
+(r13) right update 2
+K 10
+svn:author
+V 4
+samv
+K 8
+svn:date
+V 27
+2009-12-19T16:17:57.341143Z
+PROPS-END
+
+Node-path: branches/right/bang
+Node-kind: file
+Node-action: add
+Prop-content-length: 10
+Text-content-length: 8
+Text-content-md5: 34c28f1d2dc6a9adeccc4265bf7516cb
+Text-content-sha1: 0bc5bb345c0e71d28f784f12e0bd2d384c283062
+Content-length: 18
+
+PROPS-END
+thwacke
+
+
+Revision-number: 14
+Prop-content-length: 141
+Content-length: 141
+
+K 7
+svn:log
+V 42
+(r14) Cherry-pick right 2 commits to trunk
+K 10
+svn:author
+V 4
+samv
+K 8
+svn:date
+V 27
+2009-12-19T16:17:57.841851Z
+PROPS-END
+
+Node-path: trunk
+Node-kind: dir
+Node-action: change
+Prop-content-length: 75
+Content-length: 75
+
+K 13
+svn:mergeinfo
+V 40
+/branches/left:2-10
+/branches/right:6-13
 PROPS-END
 
 
@@ -767,31 +1019,147 @@ backup: clean
 	cd .. ; tar czvf dircache.tar.gz dir-cache
 
 
-Revision-number: 10
-Prop-content-length: 116
-Content-length: 116
+Node-path: trunk/bang
+Node-kind: file
+Node-action: add
+Node-copyfrom-rev: 13
+Node-copyfrom-path: branches/right/bang
+Text-copy-source-md5: 34c28f1d2dc6a9adeccc4265bf7516cb
+Text-copy-source-sha1: 0bc5bb345c0e71d28f784f12e0bd2d384c283062
+
+
+Revision-number: 15
+Prop-content-length: 127
+Content-length: 127
 
 K 7
 svn:log
-V 13
-left update 4
+V 28
+(r15) Merge right to trunk 1
 K 10
 svn:author
-V 8
-tallsopp
+V 4
+samv
 K 8
 svn:date
 V 27
-2009-11-12T20:29:52.081644Z
+2009-12-19T16:17:58.368520Z
 PROPS-END
 
-Node-path: branches/left/Makefile
+Node-path: trunk
+Node-kind: dir
+Node-action: change
+Prop-content-length: 75
+Content-length: 75
+
+K 13
+svn:mergeinfo
+V 40
+/branches/left:2-10
+/branches/right:2-14
+PROPS-END
+
+
+Revision-number: 16
+Prop-content-length: 119
+Content-length: 119
+
+K 7
+svn:log
+V 20
+(r16) right update 3
+K 10
+svn:author
+V 4
+samv
+K 8
+svn:date
+V 27
+2009-12-19T16:17:58.779056Z
+PROPS-END
+
+Node-path: branches/right/urkkk
+Node-kind: file
+Node-action: add
+Prop-content-length: 10
+Text-content-length: 6
+Text-content-md5: 5889c8392e16251b0c80927607a03036
+Text-content-sha1: 3934264d277a0cf886b6b1c7f2b9e56da2525302
+Content-length: 16
+
+PROPS-END
+whamm
+
+
+Revision-number: 17
+Prop-content-length: 119
+Content-length: 119
+
+K 7
+svn:log
+V 20
+(r17) trunk update 1
+K 10
+svn:author
+V 4
+samv
+K 8
+svn:date
+V 27
+2009-12-19T16:17:59.221851Z
+PROPS-END
+
+Node-path: trunk/vronk
+Node-kind: file
+Node-action: add
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+Content-length: 14
+
+PROPS-END
+pow
+
+
+Revision-number: 18
+Prop-content-length: 135
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+
+K 7
+svn:log
+V 36
+(r18) Merge right to left sub-branch
+K 10
+svn:author
+V 4
+samv
+K 8
+svn:date
+V 27
+2009-12-19T16:17:59.781666Z
+PROPS-END
+
+Node-path: branches/left-sub
+Node-kind: dir
+Node-action: change
+Prop-content-length: 55
+Content-length: 55
+
+K 13
+svn:mergeinfo
+V 20
+/branches/right:2-17
+PROPS-END
+
+
+Node-path: branches/left-sub/Makefile
 Node-kind: file
 Node-action: change
-Text-content-length: 2529
-Text-content-md5: f6b197cc3f2e89a83e545d4bb003de73
-Text-content-sha1: 2f656677cfec0bceec85e53036ffb63e25126f8e
-Content-length: 2529
+Text-content-length: 2713
+Text-content-md5: 0afbe34f244cd662b1f97d708c687f90
+Text-content-sha1: 46d9377d783e67a9b581da110352e799517c8a14
+Content-length: 2713
 
 # -DCOLLISION_CHECK if you believe that SHA1's
 # 1461501637330902918203684832716283019655932542976 hashes do not give you
@@ -809,112 +1177,7 @@ CC=gcc
 
 PROG=   update-cache show-diff init-db write-tree read-tree commit-tree \
 	cat-file fsck-cache checkout-cache diff-tree rev-tree show-files \
-	check-files ls-tree merge-base
-
-all: $(PROG)
-
-install: $(PROG)
-	install $(PROG) $(HOME)/bin/
-
-LIBS= -lssl -lz
-
-init-db: init-db.o
-
-update-cache: update-cache.o read-cache.o
-	$(CC) $(CFLAGS) -o update-cache update-cache.o read-cache.o $(LIBS)
-
-show-diff: show-diff.o read-cache.o
-	$(CC) $(CFLAGS) -o show-diff show-diff.o read-cache.o $(LIBS)
-
-write-tree: write-tree.o read-cache.o
-	$(CC) $(CFLAGS) -o write-tree write-tree.o read-cache.o $(LIBS)
-
-read-tree: read-tree.o read-cache.o
-	$(CC) $(CFLAGS) -o read-tree read-tree.o read-cache.o $(LIBS)
-
-commit-tree: commit-tree.o read-cache.o
-	$(CC) $(CFLAGS) -o commit-tree commit-tree.o read-cache.o $(LIBS)
-
-cat-file: cat-file.o read-cache.o
-	$(CC) $(CFLAGS) -o cat-file cat-file.o read-cache.o $(LIBS)
-
-fsck-cache: fsck-cache.o read-cache.o object.o commit.o tree.o blob.o
-	$(CC) $(CFLAGS) -o fsck-cache fsck-cache.o read-cache.o object.o commit.o tree.o blob.o $(LIBS)
-
-checkout-cache: checkout-cache.o read-cache.o
-	$(CC) $(CFLAGS) -o checkout-cache checkout-cache.o read-cache.o $(LIBS)
-
-diff-tree: diff-tree.o read-cache.o
-	$(CC) $(CFLAGS) -o diff-tree diff-tree.o read-cache.o $(LIBS)
-
-rev-tree: rev-tree.o read-cache.o object.o commit.o tree.o blob.o
-	$(CC) $(CFLAGS) -o rev-tree rev-tree.o read-cache.o object.o commit.o tree.o blob.o $(LIBS)
-
-show-files: show-files.o read-cache.o
-	$(CC) $(CFLAGS) -o show-files show-files.o read-cache.o $(LIBS)
-
-check-files: check-files.o read-cache.o
-	$(CC) $(CFLAGS) -o check-files check-files.o read-cache.o $(LIBS)
-
-ls-tree: ls-tree.o read-cache.o
-	$(CC) $(CFLAGS) -o ls-tree ls-tree.o read-cache.o $(LIBS)
-
-merge-base: merge-base.o read-cache.o
-	$(CC) $(CFLAGS) -o merge-base merge-base.o read-cache.o $(LIBS)
-
-read-cache.o: cache.h
-show-diff.o: cache.h
-
-clean:
-	rm -f *.o $(PROG)
-
-backup: clean
-	cd .. ; tar czvf dircache.tar.gz dir-cache
-
-
-Revision-number: 11
-Prop-content-length: 117
-Content-length: 117
-
-K 7
-svn:log
-V 14
-right update 1
-K 10
-svn:author
-V 8
-tallsopp
-K 8
-svn:date
-V 27
-2009-11-12T20:29:53.059636Z
-PROPS-END
-
-Node-path: branches/right/Makefile
-Node-kind: file
-Node-action: change
-Text-content-length: 2593
-Text-content-md5: 5ccff689fb290e00b85fe18ee50c54ba
-Text-content-sha1: a13de8e23f1483efca3e57b2b64b0ae6f740ce10
-Content-length: 2593
-
-# -DCOLLISION_CHECK if you believe that SHA1's
-# 1461501637330902918203684832716283019655932542976 hashes do not give you
-# enough guarantees about no collisions between objects ever hapenning.
-#
-# -DNSEC if you want git to care about sub-second file mtimes and ctimes.
-# Note that you need some new glibc (at least >2.2.4) for this, and it will
-# BREAK YOUR LOCAL DIFFS! show-diff and anything using it will likely randomly
-# break unless your underlying filesystem supports those sub-second times
-# (my ext3 doesn't).
-CFLAGS=-g -O3 -Wall
-
-CC=gcc
-
-
-PROG=   update-cache show-diff init-db write-tree read-tree commit-tree \
-	cat-file fsck-cache checkout-cache diff-tree rev-tree show-files \
-	check-files ls-tree merge-base
+	check-files ls-tree merge-base merge-cache
 
 all: $(PROG)
 
@@ -967,6 +1230,9 @@ ls-tree: ls-tree.o read-cache.o
 merge-base: merge-base.o read-cache.o object.o commit.o tree.o blob.o
 	$(CC) $(CFLAGS) -o merge-base merge-base.o read-cache.o object.o commit.o tree.o blob.o $(LIBS)
 
+merge-cache: merge-cache.o read-cache.o
+	$(CC) $(CFLAGS) -o merge-cache merge-cache.o read-cache.o $(LIBS)
+
 read-cache.o: cache.h
 show-diff.o: cache.h
 
@@ -977,34 +1243,383 @@ backup: clean
 	cd .. ; tar czvf dircache.tar.gz dir-cache
 
 
-Revision-number: 12
-Prop-content-length: 116
-Content-length: 116
+Node-path: branches/left-sub/bang
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+
+
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+Text-copy-source-sha1: 3934264d277a0cf886b6b1c7f2b9e56da2525302
+
+
+Revision-number: 19
+Prop-content-length: 129
+Content-length: 129
 
 K 7
 svn:log
-V 13
-Merge trunk 2
+V 30
+(r19) left sub-branch update 2
 K 10
 svn:author
-V 8
-tallsopp
+V 4
+samv
 K 8
 svn:date
 V 27
-2009-11-12T20:29:56.083003Z
+2009-12-19T16:18:00.200531Z
+PROPS-END
+
+Node-path: branches/left-sub/wham_eth
+Node-kind: file
+Node-action: add
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+Content-length: 16
+
+PROPS-END
+zowie
+
+
+Revision-number: 20
+Prop-content-length: 118
+Content-length: 118
+
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+svn:log
+V 19
+(r20) left update 5
+K 10
+svn:author
+V 4
+samv
+K 8
+svn:date
+V 27
+2009-12-19T16:18:00.659636Z
+PROPS-END
+
+Node-path: branches/left/glurpp
+Node-kind: file
+Node-action: add
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+Text-content-md5: 14a169f628e0bb59df9c2160649d0a30
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+
+PROPS-END
+eee_yow
+
+
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+
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+(r21) Cherry-pick left sub-branch commit to left
+K 10
+svn:author
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+samv
+K 8
+svn:date
+V 27
+2009-12-19T16:18:01.194402Z
+PROPS-END
+
+Node-path: branches/left
+Node-kind: dir
+Node-action: change
+Prop-content-length: 56
+Content-length: 56
+
+K 13
+svn:mergeinfo
+V 21
+/branches/left-sub:19
+PROPS-END
+
+
+Node-path: branches/left/wham_eth
+Node-kind: file
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+Text-copy-source-sha1: b165019b005c199237ba822c4404e771e93b654a
+
+
+Revision-number: 22
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+Content-length: 134
+
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+svn:log
+V 35
+(r22) Merge left sub-branch to left
+K 10
+svn:author
+V 4
+samv
+K 8
+svn:date
+V 27
+2009-12-19T16:18:01.679218Z
+PROPS-END
+
+Node-path: branches/left
+Node-kind: dir
+Node-action: change
+Prop-content-length: 79
+Content-length: 79
+
+K 13
+svn:mergeinfo
+V 44
+/branches/left-sub:4-19
+/branches/right:2-17
+PROPS-END
+
+
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+Node-kind: file
+Node-action: change
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+Text-content-sha1: 46d9377d783e67a9b581da110352e799517c8a14
+Content-length: 2713
+
+# -DCOLLISION_CHECK if you believe that SHA1's
+# 1461501637330902918203684832716283019655932542976 hashes do not give you
+# enough guarantees about no collisions between objects ever hapenning.
+#
+# -DNSEC if you want git to care about sub-second file mtimes and ctimes.
+# Note that you need some new glibc (at least >2.2.4) for this, and it will
+# BREAK YOUR LOCAL DIFFS! show-diff and anything using it will likely randomly
+# break unless your underlying filesystem supports those sub-second times
+# (my ext3 doesn't).
+CFLAGS=-g -O3 -Wall
+
+CC=gcc
+
+
+PROG=   update-cache show-diff init-db write-tree read-tree commit-tree \
+	cat-file fsck-cache checkout-cache diff-tree rev-tree show-files \
+	check-files ls-tree merge-base merge-cache
+
+all: $(PROG)
+
+install: $(PROG)
+	install $(PROG) $(HOME)/bin/
+
+LIBS= -lssl -lz
+
+init-db: init-db.o
+
+update-cache: update-cache.o read-cache.o
+	$(CC) $(CFLAGS) -o update-cache update-cache.o read-cache.o $(LIBS)
+
+show-diff: show-diff.o read-cache.o
+	$(CC) $(CFLAGS) -o show-diff show-diff.o read-cache.o $(LIBS)
+
+write-tree: write-tree.o read-cache.o
+	$(CC) $(CFLAGS) -o write-tree write-tree.o read-cache.o $(LIBS)
+
+read-tree: read-tree.o read-cache.o
+	$(CC) $(CFLAGS) -o read-tree read-tree.o read-cache.o $(LIBS)
+
+commit-tree: commit-tree.o read-cache.o
+	$(CC) $(CFLAGS) -o commit-tree commit-tree.o read-cache.o $(LIBS)
+
+cat-file: cat-file.o read-cache.o
+	$(CC) $(CFLAGS) -o cat-file cat-file.o read-cache.o $(LIBS)
+
+fsck-cache: fsck-cache.o read-cache.o object.o commit.o tree.o blob.o
+	$(CC) $(CFLAGS) -o fsck-cache fsck-cache.o read-cache.o object.o commit.o tree.o blob.o $(LIBS)
+
+checkout-cache: checkout-cache.o read-cache.o
+	$(CC) $(CFLAGS) -o checkout-cache checkout-cache.o read-cache.o $(LIBS)
+
+diff-tree: diff-tree.o read-cache.o
+	$(CC) $(CFLAGS) -o diff-tree diff-tree.o read-cache.o $(LIBS)
+
+rev-tree: rev-tree.o read-cache.o object.o commit.o tree.o blob.o
+	$(CC) $(CFLAGS) -o rev-tree rev-tree.o read-cache.o object.o commit.o tree.o blob.o $(LIBS)
+
+show-files: show-files.o read-cache.o
+	$(CC) $(CFLAGS) -o show-files show-files.o read-cache.o $(LIBS)
+
+check-files: check-files.o read-cache.o
+	$(CC) $(CFLAGS) -o check-files check-files.o read-cache.o $(LIBS)
+
+ls-tree: ls-tree.o read-cache.o
+	$(CC) $(CFLAGS) -o ls-tree ls-tree.o read-cache.o $(LIBS)
+
+merge-base: merge-base.o read-cache.o object.o commit.o tree.o blob.o
+	$(CC) $(CFLAGS) -o merge-base merge-base.o read-cache.o object.o commit.o tree.o blob.o $(LIBS)
+
+merge-cache: merge-cache.o read-cache.o
+	$(CC) $(CFLAGS) -o merge-cache merge-cache.o read-cache.o $(LIBS)
+
+read-cache.o: cache.h
+show-diff.o: cache.h
+
+clean:
+	rm -f *.o $(PROG)
+
+backup: clean
+	cd .. ; tar czvf dircache.tar.gz dir-cache
+
+
+Node-path: branches/left/README
+Node-kind: file
+Node-action: add
+Node-copyfrom-rev: 18
+Node-copyfrom-path: branches/left-sub/README
+Text-copy-source-md5: fdbcfb6be9afe1121862143f226b51cf
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+
+
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+
+
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+
+
+Revision-number: 23
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+
+K 7
+svn:log
+V 27
+(r23) Merge left to trunk 2
+K 10
+svn:author
+V 4
+samv
+K 8
+svn:date
+V 27
+2009-12-19T16:18:02.212349Z
 PROPS-END
 
 Node-path: trunk
 Node-kind: dir
 Node-action: change
-Prop-content-length: 54
-Content-length: 54
+Prop-content-length: 99
+Content-length: 99
 
 K 13
 svn:mergeinfo
-V 19
-/branches/left:2-11
+V 64
+/branches/left:2-22
+/branches/left-sub:4-19
+/branches/right:2-17
+PROPS-END
+
+
+Node-path: trunk/README
+Node-kind: file
+Node-action: add
+Node-copyfrom-rev: 22
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+
+
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+
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+
+
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+(r24) non-merge right to trunk 2
+K 10
+svn:author
+V 4
+samv
+K 8
+svn:date
+V 27
+2009-12-19T16:18:02.672148Z
+PROPS-END
+
+Node-path: trunk
+Node-kind: dir
+Node-action: change
+Prop-content-length: 99
+Content-length: 99
+
+K 13
+svn:mergeinfo
+V 64
+/branches/left:2-22
+/branches/left-sub:4-19
+/branches/right:2-22
 PROPS-END
 
 
diff --git a/t/t9152-svn-empty-dirs-after-gc.sh b/t/t9152-svn-empty-dirs-after-gc.sh
new file mode 100755
index 0000000000..301e779709
--- /dev/null
+++ b/t/t9152-svn-empty-dirs-after-gc.sh
@@ -0,0 +1,40 @@
+#!/bin/sh
+#
+# Copyright (c) 2009 Robert Zeh
+
+test_description='git svn creates empty directories, calls git gc, makes sure they are still empty'
+. ./lib-git-svn.sh
+
+test_expect_success 'initialize repo' '
+	for i in a b c d d/e d/e/f "weird file name"
+	do
+		svn_cmd mkdir -m "mkdir $i" "$svnrepo"/"$i"
+	done
+'
+
+test_expect_success 'clone' 'git svn clone "$svnrepo" cloned'
+
+test_expect_success 'git svn gc runs' '
+	(
+		cd cloned &&
+		git svn gc
+	)
+'
+
+test_expect_success 'git svn mkdirs recreates empty directories after git svn gc' '
+	(
+		cd cloned &&
+		rm -r * &&
+		git svn mkdirs &&
+		for i in a b c d d/e d/e/f "weird file name"
+		do
+			if ! test -d "$i"
+			then
+				echo >&2 "$i does not exist"
+				exit 1
+			fi
+		done
+	)
+'
+
+test_done