Revert "Merge pull request #54980 from danbst/etc-relative" (#56507)

This reverts commit 0b91fa43e4, reversing
changes made to 183919a0c0.

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

@@ -10,11 +10,6 @@ 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]}"
@@ -24,14 +19,14 @@ for ((i = 0; i < ${#targets_[@]}; i++)); do
         # If the source name contains '*', perform globbing.
         mkdir -p $out/etc/$target
         for fn in $source; do
-            ln -s --relative "$fn" $out/etc/$target/
+            ln -s "$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
+            ln -s $source $out/etc/$target
         else
             echo "duplicate entry $target -> $source"
             if test "$(readlink $out/etc/$target)" != "$source"; then
@@ -39,13 +34,13 @@ for ((i = 0; i < ${#targets_[@]}; i++)); do
                 exit 1
             fi
         fi
-
+        
         if test "${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