Fix(system/services/nix-sync): Rebuild website on gc

1 files changed, 21 insertions, 9 deletions

diff --git a/system/services/nix-sync/default.nix b/system/services/nix-sync/default.nix
index 4440d59..8652b43 100644
--- a/system/services/nix-sync/default.nix
+++ b/system/services/nix-sync/default.nix
@@ -15,13 +15,13 @@
     after = ["network-online.target"];
   };
 
+  parents = path: let
+    split_path = builtins.split "/" path;
+    filename = builtins.elemAt split_path (builtins.length split_path - 1);
+  in
+    lib.strings.removeSuffix "/" (builtins.replaceStrings [filename] [""] path);
+  esa = lib.strings.escapeShellArg;
   mkUnit = name: repo: let
-    esa = lib.strings.escapeShellArg;
-    parents = path: let
-      split_path = builtins.split "/" path;
-      filename = builtins.elemAt split_path (builtins.length split_path - 1);
-    in
-      lib.strings.removeSuffix "/" (builtins.replaceStrings [filename] [""] path);
     optionalPathSeparator =
       if lib.strings.hasPrefix "/" repo.path
       then ""
@@ -36,7 +36,6 @@
       origin="$(git rev-parse @{u})";
       branch="$(git rev-parse @)";
 
-      # FIXME: this will fail, after a `nix store gc` as the link is not in the gc-roots
       if ! [ "$origin" = "$branch" ]; then
         git pull;
 
@@ -44,14 +43,15 @@
         nix build . --print-out-paths --experimental-features 'nix-command flakes' > "$out_paths";
         [ "$(wc -l < "$out_paths")" -gt 1 ] && (echo "To many out-paths"; exit 1)
         out_path="$(cat "$out_paths")";
-        rm -r ${esa repo.path};
+        rm ${esa repo.path};
         ln -s "$out_path" ${esa repo.path};
         rm "$out_paths";
       fi
     '';
     execStartPreScript = ''
       export XDG_CACHE_HOME="$CACHE_DIRECTORY";
-      if ! stat ${esa repoCachePath}/.git 1>/dev/null 2>&1; then
+
+      if ! [ -d ${esa repoCachePath}/.git ]; then
           mkdir --parents ${esa repoCachePath};
           git clone ${esa repo.uri} ${esa repoCachePath};
 
@@ -62,6 +62,18 @@
           ln -s "$out_path" ${esa repo.path};
           rm "$out_paths";
       fi
+
+      if ! [ -L ${esa repo.path} ]; then
+        cd ${esa repoCachePath};
+
+        out_paths=$(mktemp);
+        nix build . --print-out-paths --experimental-features 'nix-command flakes' > "$out_paths";
+        [ "$(wc -l < "$out_paths")" -gt 1 ] && (echo "To many out-paths"; exit 1)
+        out_path="$(cat "$out_paths")";
+        rm ${esa repo.path};
+        ln -s "$out_path" ${esa repo.path};
+        rm "$out_paths";
+      fi
     '';
   in {
     description = "Nix Sync ${name}";