nixpkgs/nixos/modules/system/etc/make-etc.sh
Florian Jacob fc8e1745c0 nixos/etc: Make symlinks relative instead of absolute
so that the links can be followed if the NixOS installation is not mounted as filesystem root.
In particular, this makes /etc/os-release adhere to the standard:
https://www.freedesktop.org/software/systemd/man/os-release.html
Fixes #28833.
2019-01-31 09:17:35 +02:00

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source $stdenv/setup
mkdir -p $out/etc
set -f
sources_=($sources)
targets_=($targets)
modes_=($modes)
users_=($users)
groups_=($groups)
set +f
# Create relative symlinks, so that the links can be followed if
# the NixOS installation is not mounted as filesystem root.
# Absolute symlinks violate the os-release format
# at https://www.freedesktop.org/software/systemd/man/os-release.html
# and break e.g. systemd-nspawn and os-prober.
for ((i = 0; i < ${#targets_[@]}; i++)); do
source="${sources_[$i]}"
target="${targets_[$i]}"
if [[ "$source" =~ '*' ]]; then
# If the source name contains '*', perform globbing.
mkdir -p $out/etc/$target
for fn in $source; do
ln -s --relative "$fn" $out/etc/$target/
done
else
mkdir -p $out/etc/$(dirname $target)
if ! [ -e $out/etc/$target ]; then
ln -s --relative $source $out/etc/$target
else
echo "duplicate entry $target -> $source"
if test "$(readlink $out/etc/$target)" != "$source"; then
echo "mismatched duplicate entry $(readlink $out/etc/$target) <-> $source"
exit 1
fi
fi
if test "${modes_[$i]}" != symlink; then
echo "${modes_[$i]}" > $out/etc/$target.mode
echo "${users_[$i]}" > $out/etc/$target.uid
echo "${groups_[$i]}" > $out/etc/$target.gid
fi
fi
done