enos: add shfmt formatting to enos module scripts (#28142)

Signed-off-by: Ryan Cragun <me@ryan.ec>

.github/actions/install-external-tools/action.yml

@@ -18,6 +18,7 @@ runs:
     - uses: ./.github/actions/set-up-gosimports
     - uses: ./.github/actions/set-up-gotestsum
     - uses: ./.github/actions/set-up-misspell
+    - uses: ./.github/actions/set-up-shfmt
     - uses: ./.github/actions/set-up-staticcheck
       # We assume that the Go toolchain will be managed by the caller workflow so we don't set one
       # up here.

.github/actions/set-up-shfmt/action.yml

@@ -0,0 +1,61 @@
+# Copyright (c) HashiCorp, Inc.
+# SPDX-License-Identifier: BUSL-1.1
+
+---
+name: Set up shfmt from Github releases
+description: Set up shfmt from Github releases
+
+inputs:
+  destination:
+    description: "Where to install the shfmt binary (default: $HOME/bin/shfmt)"
+    type: boolean
+    default: "$HOME/bin/shfmt"
+  version:
+    description: "The version to install (default: latest)"
+    type: string
+    default: Latest
+
+outputs:
+  destination:
+    description: Where the installed shfmt binary is
+    value: ${{ steps.install.outputs.destination }}
+  destination-dir:
+    description: The directory where the installed shfmt binary is
+    value: ${{ steps.install.outputs.destination-dir }}
+  version:
+    description: The installed version of shfmt
+    value: ${{ steps.install.outputs.version }}
+
+runs:
+  using: composite
+  steps:
+    - id: install
+      shell: bash
+      env:
+        GH_TOKEN: ${{ github.token }}
+      run: |
+        VERSION=$(./.github/scripts/retry-command.sh gh release list -R mvdan/sh --exclude-drafts --exclude-pre-releases | grep ${{ inputs.version }} | cut -f1)
+
+        mkdir -p $(dirname ${{ inputs.destination }})
+        DESTINATION="$(readlink -f "${{ inputs.destination }}")"
+        DESTINATION_DIR="$(dirname "$DESTINATION")"
+        echo "$DESTINATION_DIR" >> "$GITHUB_PATH"
+
+        {
+          echo "destination=$DESTINATION"
+          echo "destination-dir=$DESTINATION_DIR"
+          echo "version=$VERSION"
+        } | tee -a "$GITHUB_OUTPUT"
+
+        ARCH="$(echo "$RUNNER_ARCH" | tr '[:upper:]' '[:lower:]')"
+        OS="$(echo "$RUNNER_OS" | tr '[:upper:]' '[:lower:]')"
+        if [ "$ARCH" = "x64" ]; then
+          export ARCH="amd64"
+        fi
+        if [ "$OS" = "macos" ]; then
+          export OS="darwin"
+        fi
+
+        ./.github/scripts/retry-command.sh gh release download "$VERSION" --clobber -p "shfmt_*_${OS}_${ARCH}" -O shfmt -R mvdan/sh
+        chmod +x shfmt
+        mv shfmt "$DESTINATION"

.github/workflows/enos-lint.yml

@@ -38,6 +38,7 @@ jobs:
       ENOS_VAR_tfc_api_token: ${{ secrets.TF_API_TOKEN }}
     steps:
       - uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4.1.7
+      - uses: ./.github/actions/install-external-tools
       - uses: hashicorp/setup-terraform@v3
         with:
           terraform_wrapper: false