Dgit.pm: Move read-tree wrappers from git-debrebase

No functional change other than to no longer honour @git.

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>

1 files changed, 31 insertions, 0 deletions

diff --git a/Debian/Dgit.pm b/Debian/Dgit.pm
index 912a524..f1ea1e8 100644
--- a/Debian/Dgit.pm
+++ b/Debian/Dgit.pm
@@ -60,6 +60,8 @@ BEGIN {
                       git_for_each_tag_referring is_fast_fwd
 		      git_check_unmodified
 		      git_reflog_action_msg  git_update_ref_cmd
+		      rm_subdir_cached read_tree_subdir
+		      read_tree_debian read_tree_upstream
 		      make_commit_text
 		      reflog_cache_insert reflog_cache_lookup
                       $package_re $component_re $deliberately_re
@@ -678,6 +680,35 @@ sub git_update_ref_cmd {
     return qw(git update-ref -m), $msg, @_;
 }
 
+sub rm_subdir_cached ($) {
+    my ($subdir) = @_;
+    runcmd qw(git rm --quiet -rf --cached --ignore-unmatch), $subdir;
+}
+
+sub read_tree_subdir ($$) {
+    my ($subdir, $new_tree_object) = @_;
+    rm_subdir_cached $subdir;
+    runcmd qw(git read-tree), "--prefix=$subdir/", $new_tree_object;
+}
+
+sub read_tree_debian ($) {
+    my ($treeish) = @_;
+    read_tree_subdir 'debian', "$treeish:debian";
+    rm_subdir_cached 'debian/patches';
+}
+
+sub read_tree_upstream ($;$$) {
+    my ($treeish, $keep_patches, $tree_with_debian) = @_;
+    # if $tree_with_debian is supplied, will use that for debian/
+    # otherwise will save and restore it.
+    my $debian =
+	$tree_with_debian ? "$tree_with_debian:debian"
+	: cmdoutput qw(git write-tree --prefix=debian/);
+    runcmd qw(git read-tree), $treeish;
+    read_tree_subdir 'debian', $debian;
+    rm_subdir_cached 'debian/patches' unless $keep_patches;
+}
+
 sub changedir ($) {
     my ($newdir) = @_;
     printdebug "CD $newdir\n";