pkgs/build-support/setup-hooks/reproducible-builds.sh

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