Merge pull request #19 from marcesquerra/FixNixPipeline

Ensure hash updating only generates new commit when hash changes

.github/workflows/nix.yml

@@ -18,7 +18,3 @@ jobs:
       - run: |
           export WORKSPACE="${PWD}"
           nix run .#upgrade-nix-gohip
-          git config --global user.name 'autobot'
-          git config --global user.email 'gohip.nix@github.com'
-          git commit -am "[skip ci] Automated nix hash update"
-          git push

flake.nix

@@ -24,9 +24,17 @@
 
           upgrade-nix-gohip-package = pkgs.writeShellScriptBin "upgrade-nix-gohip" ''
             echo "UPGRADING"
+            OLD_HASH_FILE=`cat $WORKSPACE/gohip.vendor.hash.nix`
             echo "pkgs : pkgs.lib.fakeHash" > $WORKSPACE/gohip.vendor.hash.nix
             NEW_HASH=`nix build .#default 2>&1 | grep " got: " | awk '{print $2}'`
             echo "pkgs : \"$NEW_HASH\"" > $WORKSPACE/gohip.vendor.hash.nix
+            NEW_HASH_FILE=`cat $WORKSPACE/gohip.vendor.hash.nix`
+            if [[ "$OLD_HASH_FILE" != "$NEW_HASH_FILE" ]]; then
+              git config --global user.name 'autobot'
+              git config --global user.email 'gohip.nix@github.com'
+              git commit -am "[skip ci] Automated nix hash update"
+              git push
+            fi
           '';
           custom-packages = {upgrade-nix-gohip = upgrade-nix-gohip-package;};