Break out git_write_tree (nfc)

diff --git a/dgit b/dgit
index 87a038009a006ad1feaa5d28b7721caa122f7959..5c8d24a7908eb891ef1ebf5765593100683f47e7 100755 (executable)
--- a/dgit
+++ b/dgit
@@ -1047,6 +1047,12 @@ sub mktree_in_ud_here () {
     symlink '../../../../objects','.git/objects' or die $!;
 }
 
+sub git_write_tree () {
+    my $tree = cmdoutput @git, qw(write-tree);
+    $tree =~ m/^\w+$/ or die "$tree ?";
+    return $tree;
+}
+
 sub mktree_in_ud_from_only_subdir () {
     # changes into the subdir
     my (@dirs) = <*/.>;
@@ -1061,8 +1067,7 @@ sub mktree_in_ud_from_only_subdir () {
        rmtree '.pc';
     }
     runcmd @git, qw(add -Af);
-    my $tree = cmdoutput @git, qw(write-tree);
-    $tree =~ m/^\w+$/ or die "$tree ?";
+    my $tree=git_write_tree();
     return ($tree,$dir);
 }