Timeout for external commands

Debexpo execute a variety of external commands for testing, qa reporting, importing or GPG manipulation.

Lintian having proven that it could hang around for a while, we've decided to introduce an timeout for all external commands. Namely:

• Testing:
  • git storage (git)
  • building packages (dpkg-buildpackage, tar, gpg, dpkg-parsechangelog)
• Importing
  • QA + gitstorage (dpkg-source)
• QA reporting
  • uscan
  • lintian
  • diffstat
• GPG
  • gpg
• Website
  • Get debexpo version (git)

My interrogation is to how organize that within the settings? Should we:

1. Have a default timeout and a custom one for all commands:

DEFAULT_EXECUTION_TIMEOUT = 30 * 60
EXECUTION_TIMEOUT_LINTIAN = DEFAULT_EXECUTION_TIMEOUT
EXECUTION_TIMEOUT_DPKG_SOURCE = 5 * 60
# ... and so on

2. Have a per group timeout:

EXECUTION_TIMEOUT_QA = ...
EXECUTION_TIMEOUT_IMPORTER = ...

3. Just have a unique timeout setting
4. Something else?

I'm wondering if adding a timeout for all commands is overkill (over-SIGKILL?). Maybe we should do that only for QA commands? Or just non-interactive commands (includes importing, QA and GPG)?

So many questions!!