tests/test-diff-copy-depth.out

osutil: proper error checking and reporting

-- With aaa
Status:
A somename
  other-file

Diff:
diff --git a/other-file b/somename
copy from other-file
copy to somename

-- With zzz
Status:
A somename
  other-file

Diff:
diff --git a/other-file b/somename
copy from other-file
copy to somename