[bug #60819] Avoid blocking install (configure) if /dev/shm is non-executable

[Boud Roukema]

URL:
  <https://savannah.nongnu.org/bugs/?60819>

                 Summary: Avoid blocking install (configure) if /dev/shm is
non-executable
                 Project: Maneage
            Submitted by: boud
            Submitted on: Thu 24 Jun 2021 07:50:35 PM UTC
                Category: None
                Severity: 3 - Normal
              Item Group: None
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any

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Details:

BUG: Some systems have /dev/shm and set the `noexec' flag on /dev/shm for
security
reasons [1]. In this case on one system that I tried, the initial software
build failed with
 
./reproduce/software/shell/pre-make-build.sh: line 183: ./configure:
Permission denied


COMMENT:
A Maneage project should not require an extra
hack on a system just because it is secure. 

REPRODUCE: 
On a system with /dev/shm, do


sudo mount -o remount,noexec /dev/shm


and then try a completely fresh install of Maneage (e.g. commit b97c1ff). This
should fail with the message above.


PROPOSED SOLUTION:

This commit
https://codeberg.org/boud/maneage_dev/commit/3b0e314efab87b9e6da35d554730f2b8583d1c6a
creates a trivial dummy executable script file in /dev/shm
and resets the `configure.sh' variable associated with /dev/shm
to an empty string if the dummy script is found to
be not executable despite having been given executable rights
with chmod.

A possible simplification of this script would be for
the dummy script to be a zero-byte file.


[1] https://serverfault.com/questions/72356/how-useful-is-mounting-tmp-noexec
    (archive:
   
https://web.archive.org/web/20210624192819/https://serverfault.com/questions/72356/how-useful-is-mounting-tmp-noexec)






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