Merge pull request #268458 from Mic92/dockertools

nixos/dockerTools: fixup proot/fakeroot code (fixes dockertools nixos test)

pkgs/build-support/docker/default.nix

···
             (cd old_out; eval "$extraCommands" )
 
             mkdir $out
-            ${optionalString enableFakechroot ''proot -r $PWD/old_out ${bind-paths} --pwd=/ ''}fakeroot bash -c '
-              source $stdenv/setup
-              ${optionalString (!enableFakechroot) ''cd old_out''}
-              eval "$fakeRootCommands"
-              tar \
-                --sort name \
-                --numeric-owner --mtime "@$SOURCE_DATE_EPOCH" \
-                --hard-dereference \
-                -cf $out/layer.tar .
-            '
-
+            ${if enableFakechroot then ''
+              proot -r $PWD/old_out ${bind-paths} --pwd=/ --root-id bash -c '
+                source $stdenv/setup
+                eval "$fakeRootCommands"
+                tar \
+                  --sort name \
+                  --exclude=./proc \
+                  --exclude=./sys \
+                  --numeric-owner --mtime "@$SOURCE_DATE_EPOCH" \
+                  --hard-dereference \
+                  -cf $out/layer.tar .
+              '
+            '' else ''
+              fakeroot bash -c '
+                source $stdenv/setup
+                cd old_out
+                eval "$fakeRootCommands"
+                tar \
+                  --sort name \
+                  --numeric-owner --mtime "@$SOURCE_DATE_EPOCH" \
+                  --hard-dereference \
+                  -cf $out/layer.tar .
+              '
+            ''}
             sha256sum $out/layer.tar \
               | cut -f 1 -d ' ' \
               > $out/checksum