core/pkgs/build-support/setup-hooks/reproducible-builds.sh
2024-05-13 11:34:52 -04:00

12 lines
492 B
Bash

# Use the last part of the out path as hash input for the build.
# This should ensure that it is deterministic across rebuilds of the same
# derivation and not easily collide with other builds.
# We also truncate the hash so that it cannot cause reference cycles.
NIX_CFLAGS_COMPILE="${NIX_CFLAGS_COMPILE:-} -frandom-seed=$(
randSeed=${NIX_OUTPATH_USED_AS_RANDOM_SEED:-$out}
outbase="${randSeed##*/}"
randomseed="${outbase:0:10}"
echo $randomseed
)"
export NIX_CFLAGS_COMPILE