Bug#772276: unhelpful: "Copy failed: No such file or directory at /usr/share/dh-exec/dh-exec-install-rename line 32, <> line 6."

[Helmut Grohne]

Package: dh-exec
Version: 0.13
Severity: minor
File: /usr/share/dh-exec/dh-exec-install-rename
Tags: patch
User: helm...@debian.org
Usertags: rebootstrap

I was faced with a build failure of util-linux today (probably a pebcak)
and was greeted by this error message:

| Copy failed: No such file or directory at 
/usr/share/dh-exec/dh-exec-install-rename line 32, <> line 6.

This is not helpful. It could be telling me which file is missing.
Consider using the attached patch.

Helmut

diff -Nru dh-exec-0.13/debian/changelog dh-exec-0.13+nmu1/debian/changelog
--- dh-exec-0.13/debian/changelog       2014-08-07 13:43:52.000000000 +0200
+++ dh-exec-0.13+nmu1/debian/changelog  2014-12-06 14:24:37.000000000 +0100
@@ -1,3 +1,10 @@
+dh-exec (0.13+nmu1) UNRELEASED; urgency=medium
+
+  * Non-maintainer upload.
+  * Make dh-exec-install-rename's error messages helpful. (Closes: #-1)
+
+ -- Helmut Grohne <hel...@subdivi.de>  Sat, 06 Dec 2014 14:24:05 +0100
+
 dh-exec (0.13) unstable; urgency=medium
 
   * Fix a typo in the package description. Thanks James Cowgill!
diff -Nru dh-exec-0.13/lib/dh-exec-install-rename 
dh-exec-0.13+nmu1/lib/dh-exec-install-rename
--- dh-exec-0.13/lib/dh-exec-install-rename     2014-08-07 12:56:14.000000000 
+0200
+++ dh-exec-0.13+nmu1/lib/dh-exec-install-rename        2014-12-06 
14:24:02.000000000 +0100
@@ -32,7 +32,7 @@
         cp ($src, File::Spec->catfile ($debpath, $dstfile)) or
                 move (File::Spec->catfile ("debian/tmp", $src),
                       File::Spec->catfile ($debpath, $dstfile)) or
-                                die "Copy failed: $!";
+                                die "Failed to copy '$src': $!";
         $_ = File::Spec->catfile ($debpath, $dstfile);
         $_ .= " " . $dstpath if ($append_destpath eq TRUE);
         $_ .= "\n";