[Bug 90085] Re: When /tmp is mounted noexec, preconfigure fails

[Stefan Tauner]

My workaround uses a dedicated directory for apt that is noexec as well
but becomes temporally during installs:

/etc/fstab:

    tmpfs /tmp tmpfs defaults,noatime,nosuid,nodev,noexec,mode=1777,size=512M 0 0
    tmpfs /var/tmp/apt tmpfs defaults,noatime,nosuid,nodev,noexec,mode=1777,size=512M 0 0

/etc/apt/apt.conf.d/71tmpapt (or whatever):

    DPkg
    {
       Pre-Invoke  { "mount /var/tmp/apt -o remount,exec" };
       Post-Invoke { "mount /var/tmp/apt -o remount,noexec" };
    };
    
    APT::ExtractTemplates::TempDir "/var/tmp/apt";

Since the mount point must(?) exist for any mount point specified in
/etc/fstab I put the apt dir into /var/tmp because its contents are
persistent (unlike /tmp's). It's not very throughly tested yet... ymmv.

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https://bugs.launchpad.net/bugs/90085

Title:
  When /tmp is mounted noexec, preconfigure fails

Status in debconf package in Ubuntu:
  Triaged
Status in debconf package in Debian:
  Confirmed

Bug description:
  Binary package hint: mysql-server

  
  /tmp mounted noexec, this ensues:

  
  Preconfiguring packages ...
  Can't exec "/tmp/mysql-server-5.0.config.89611": Permission denied at /usr/share/perl/5.8/IPC/Open3.pm line 168.
  open2: exec of /tmp/mysql-server-5.0.config.89611 configure  failed at /usr/share/perl5/Debconf/ConfModule.pm line 57
  mysql-server-5.0 failed to preconfigure, with exit status 2

  ace

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