builtin-blame: set up the work_tree before the first file access

diff --git a/git-cvsexportcommit.perl b/git-cvsexportcommit.perl
index 7a955d4530611674c1d6650ce00dd4ff65cf15bc..26844af4390b8b0902ad853f40e4d9f60b75fd23 100755 (executable)
--- a/git-cvsexportcommit.perl
+++ b/git-cvsexportcommit.perl
@@ -82,6 +82,7 @@
     }
 }
 
+my $noparent = "0000000000000000000000000000000000000000";
 if ($parent) {
     my $found;
     # double check that it's a valid parent
@@ -95,8 +96,10 @@
 } else { # we don't have a parent from the cmdline...
     if (@parents == 1) { # it's safe to get it from the commit
        $parent = $parents[0];
-    } else { # or perhaps not!
-       die "This commit has more than one parent -- please name the parent you want to use explicitly";
+    } elsif (@parents == 0) { # there is no parent
+        $parent = $noparent;
+    } else { # cannot choose automatically from multiple parents
+        die "This commit has more than one parent -- please name the parent you want to use explicitly";
     }
 }
 
@@ -116,7 +119,11 @@
 }
 close MSG;
 
-`git-diff-tree --binary -p $parent $commit >.cvsexportcommit.diff`;# || die "Cannot diff";
+if ($parent eq $noparent) {
+    `git-diff-tree --binary -p --root $commit >.cvsexportcommit.diff`;# || die "Cannot diff";
+} else {
+    `git-diff-tree --binary -p $parent $commit >.cvsexportcommit.diff`;# || die "Cannot diff";
+}
 
 ## apply non-binary changes
 
@@ -219,6 +226,17 @@
 
 print "Patch applied successfully. Adding new files and directories to CVS\n";
 my $dirtypatch = 0;
+
+#
+# We have to add the directories in order otherwise we will have
+# problems when we try and add the sub-directory of a directory we
+# have not added yet.
+#
+# Luckily this is easy to deal with by sorting the directories and
+# dealing with the shortest ones first.
+#
+@dirs = sort { length $a <=> length $b} @dirs;
+
 foreach my $d (@dirs) {
     if (system(@cvs,'add',$d)) {
        $dirtypatch = 1;