George Hartzell ad5fb40d75 perl: add write permissions to update config files (#5746) ... Perl installs a couple of config files that need to be munged so that they don't refer to the spack compiler. These files are installed read-only. Behind the scenes 'filter_file' moves its file to a safe place, and tries to create a working file that is both O_WRONLY and has the perms of the original file. On an NFSv4 filesystem, the combination of 'r--r--r--' and O_WRONLY throws a permissions error. This commit adds a simple context manager that temporarily makes the files writable.		2017-10-17 18:38:23 -07:00
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spack	perl: add write permissions to update config files (#5746)	2017-10-17 18:38:23 -07:00