t / t4135 / damaged-tz.diffon commit tree-diff: convert diff_root_tree_sha1() to just call diff_tree_sha1 with old=NULL (0b707c3)
   1diff -urN -X /usr/people/jes/exclude-linux linux-2.6.12-rc2-mm3-vanilla/post image.txt linux-2.6.12-rc2-mm3/post image.txt
   2--- linux-2.6.12-rc2-mm3-vanilla/post image.txt 1969-12-31 16:00:00 -08:00
   3+++ linux-2.6.12-rc2-mm3/post image.txt 2005-04-12 02:14:06 -07:00
   4@@ -0,0 +1 @@
   5+postimage