Add reinstall option

.github/workflows/ci.yml

@@ -36,6 +36,21 @@ jobs:
         run: nix-instantiate -E 'builtins.currentTime' --eval
         if: success() || failure()
         shell: sh -l {0}
+      - name: Install Nix again (noop)
+        uses: ./
+        with:
+          logger: pretty
+          log-directives: nix_installer=trace
+          backtrace: full
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+      - name: Reinstall Nix
+        uses: ./
+        with:
+          logger: pretty
+          log-directives: nix_installer=trace
+          backtrace: full
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          reinstall: true
 
   run-x86_64-darwin:
     name: Run x86_64 Darwin
@@ -71,4 +86,19 @@ jobs:
         run: nix-instantiate -E 'builtins.currentTime' --eval
         if: success() || failure()
         shell: zsh --login --interactive {0}
+      - name: Install Nix again (noop)
+        uses: ./
+        with:
+          logger: pretty
+          log-directives: nix_installer=trace
+          backtrace: full
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+      - name: Reinstall Nix
+        uses: ./
+        with:
+          logger: pretty
+          log-directives: nix_installer=trace
+          backtrace: full
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          reinstall: true
         

action.yml

@@ -2,7 +2,7 @@ name: Nix Installer
 branding:
   icon: 'box'
   color: 'purple'
-description: An experimental Nix installer using `nix-install`
+description: Install Nix
 inputs:
   planner:
     description: A planner to use
@@ -75,6 +75,8 @@ inputs:
   nix-installer-branch:
     description: The branch of `nix-installer` to use
     required: false
+  reinstall:
+    description: Force a reinstall if the
 
 runs:
   using: composite
@@ -82,6 +84,16 @@ runs:
     - name: Install Nix
       shell: bash
       run: |
+        if [ -f "/nix/receipt.json" ]; then
+          if [ -n "${{ inputs.reinstall }}" ]; then
+            /nix/nix-installer uninstall --no-confirm
+          else
+            echo "Nix was already installed, using existing install"
+            exit 0
+          fi
+          
+        fi
+
         if [ -n "${{ inputs.nix-installer-tag }}" ]; then
           export NIX_INSTALLER_TAG=${{ inputs.tag }}
           echo "Set NIX_INSTALLER_TAG=$NIX_INSTALLER_TAG"