Trying to check the sha256 for scotch (#24855), shows the checksum subcommand fails while fetch and install works. The package currently provides url and list_url properties as well as a url_for_version method (gated on previous versions).

Steps to reproduce the issue

$ spack checksum scotch@6.1.1
==> Found 1 version of scotch:
  
  6.1.1  http://gforge.inria.fr/frs/download.php/latestfile/298/scotch_6.1.1_esmumps.tar.gz

==> Something failed on http://gforge.inria.fr/frs/download.php/latestfile/298/scotch_6.1.1_esmumps.tar.gz, skipping.  (All fetchers failed)
$ spack fetch scotch@6.1.1
==> Fetching http://gforge.inria.fr/frs/download.php/latestfile/298/scotch_6.1.1.tar.gz
$
...

Error Message

See above.

Information on your system

• Spack: 0.16.2-3503-a6f839b880
• Python: 3.7.2
• Platform: linux-rhel7-broadwell
• Concretizer: original

Additional information

• I have run spack debug report and reported the version of Spack/Python/Platform
• [-] I have searched the issues of this repo and believe this is not a duplicate .. similar/overlap?
• [-] I have run the failing commands in debug mode and reported the output .. skipped inclusion since details not useful