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nixpkgs/nixos/modules/system/etc/make-etc.sh

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source $stdenv/setup
mkdir -p $out/etc
set -f
sources_=($sources)
targets_=($targets)
modes_=($modes)
set +f
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 $source; do
ln -s "$fn" $out/etc/$target/
done
else
mkdir -p $out/etc/$(dirname $target)
if ! [ -e $out/etc/$target ]; then
ln -s $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
fi
fi
done