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authorEelco Dolstra <eelco.dolstra@logicblox.com>2015-12-02 14:59:07 +0100
committerLudovic Courtès <ludo@gnu.org>2015-12-09 14:29:41 +0100
commitcb9601029ea164b86bdf997f7160d494c15d344b (patch)
treed3ee490acee71bf9199f7f2cd0426faeb2b6c419 /etc
parenta8d65643fb21fdf6c46b3d248bda411d970e53ab (diff)
downloadguix-cb9601029ea164b86bdf997f7160d494c15d344b.tar.gz
daemon: Use deterministic $TMPDIR in chroot.
Rather than using $<host-TMPDIR>/nix-build-<drvname>-<number>, the
temporary directory is now always /tmp/nix-build-<drvname>-0. This
improves bitwise-exact reproducibility for builds that store $TMPDIR
in their build output. (Of course, those should still be fixed...)

* nix/libstore/build.cc (DerivationGoal)[tmpDirInSandbox]: New field.
(DerivationGoal::startBuilder): Initialize 'useChroot' earlier.  Compute
'tmpDirInSandbox', and use it when populating 'dirsInChroot'.
* doc/guix.texi (Build Environment Setup): Document it.

Co-authored-by: Ludovic Courtès <ludo@gnu.org>
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