nixpkgs/pkgs/build-support/setup-hooks/reproducible-builds.sh
happysalada db37d37d84 reproducible-builds.sh: fatal: += not allowed in assignment
take in account undefined case
assign and export in separate step
https://github.com/koalaman/shellcheck/wiki/SC2155
2021-07-06 09:27:18 +09:00

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# shellcheck disable=SC2148
# 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 might not have been defined before
NIX_CFLAGS_COMPILE="${NIX_CFLAGS_COMPILE:-} -frandom-seed=$(
# shellcheck disable=SC2154
outbase="${out##*/}"
randomseed="${outbase:0:10}"
echo "$randomseed"
)"
export NIX_CFLAGS_COMPILE