[Reproducible-builds] Bug#795790: rdfind: please produce deterministic output

[Reiner Herrmann]

Source: rdfind
Version: 1.3.4-2
Severity: wishlist
Tags: patch
User: reproducible-builds at lists.alioth.debian.org
Usertags: toolchain fileordering
X-Debbugs-Cc: reproducible-builds at lists.alioth.debian.org

Hi!

While working on the "reproducible builds" effort [1], we have noticed
that the behaviour of rdfind is depending on the filesystem order.
When finding duplicates and replacing them with symlinks, the file
that was last created/modified(?) will be used as the destination,
which is not deterministic.

The attached patch will sort the file list by filenames before any
operation is performed on it. This will result in a deterministic
behaviour, so that packages using rdfind can be built reproducibly.

Regards,
 Reiner

[1]: https://wiki.debian.org/ReproducibleBuilds

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