Documentation index

Volatile inputs can disappear

Inputs from the network—even if it doesn’t seem like it—are volatile. It’s best to make a build system not rely on remote data.

If it must be the case, then:

  1. ensure integrity using cryptographic checksums,
  2. keep backups.

Ideally, a fallback location should be available with the backups.

A good example is how the FreeBSD ports work. Port descriptions contain a list of MASTER_SITES, a list of files to be retrieved in DISTFILES, and a distinfo file with cryptographic checksums for each of these files. The FreeBSD infrastructure ensures that a copy of all distfiles are kept available on a mirror network. When building a port, the files will be downloaded from there if the original master site is unreachable.

Documentation index

Follow us on Twitter @ReproBuilds & Reddit and please consider making a donation. Content licensed under CC BY-SA 4.0, style licensed under MIT. Templates and styles based on the Tor Styleguide. Logos and trademarks belong to their respective owners. Patches welcome via our Git repository (instructions) or via our mailing list.