Fix "mercurial repo build" test

Depending on the mercurial or tar version installed, the generated tar
file can be different. We change the test to check the checksum of the
files included in the tarball instead of the tar file.

test.pl

@@ -248,8 +248,7 @@ my @tests = (
         build => [ 'mozmill-automation', 'build' ],
         files => {
             'out/mozmill-automation-bbad7215c713_sha256sum.txt' =>
-            '13660d3f3ebbc363056ccbd3794f8f78a940dd394a464093bee5fc0575ee4090  '
-            . "mozmill-automation-bbad7215c713.tar\n",
+            "ceeda3cd3285b6ed53233dc65e3beac82f2b284402a80ef6c1fcdf5b9861f068  s.txt\n",
         },
     },
     {

test/projects/mozmill-automation/config

@@ -5,4 +5,11 @@ compress_tar: ''
 t: '[% sha256(exec("cat testrun_remote.py")) %]'
 build: |
   #!/bin/sh
-  sha256sum [% project %]-[% c("version") %].tar > [% dest_dir %]/[% project %]-[% c("version") %]_sha256sum.txt
+  mkdir t
+  tar -C t -xf mozmill-automation-bbad7215c713.tar
+  files=$(find t | sort)
+  for file in $files
+  do
+    sha256sum $file >> s.txt
+  done
+  sha256sum s.txt > [% dest_dir %]/[% project %]-[% c("version") %]_sha256sum.txt