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

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# 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.
export NIX_CFLAGS_COMPILE+=" -frandom-seed=$(
outbase="${out##*/}"
randomseed="${outbase:0:10}"
echo $randomseed
)"