feat: add support for recovering deleted files

.github/workflows/test.yml

@@ -601,6 +601,88 @@ jobs:
         shell:
           bash
 
+  test_recover_deleted_file:
+    name: Test changed-files recover deleted file
+    runs-on: ubuntu-latest
+    needs: build
+    strategy:
+      fail-fast: false
+      max-parallel: 4
+      matrix:
+        fetch-depth: [0, 1, 2]
+
+    steps:
+      - name: Checkout branch
+        uses: actions/checkout@v3
+        with:
+          ref: ${{ github.event.pull_request.head.sha || github.sha }}
+          submodules: recursive
+          fetch-depth: ${{ matrix.fetch-depth }}
+
+      - name: Download build assets
+        uses: actions/download-artifact@v3
+        with:
+          name: build-assets
+
+      - name: Run changed-files with recover_deleted_files
+        id: changed-files-recover-deleted-files
+        uses: ./
+        with:
+          base_sha: "fcdeb5b3d797752d95f6dbe98552a95c29dad338"
+          sha: "432e0c810c60ef1332850a971c5ec39022034b4c"
+          recover_deleted_files: true
+
+      - name: Show output
+        run: |
+          echo "${{ toJSON(steps.changed-files-recover-deleted-files.outputs) }}"
+        shell:
+          bash
+
+      - name: Verify deleted files
+        if: steps.changed-files-recover-deleted-files.outputs.deleted_files != 'test/test deleted.txt'
+        run: |
+          echo "Expected: (test/test deleted.txt) got ${{ steps.changed-files-recover-deleted-files.outputs.deleted_files }}"
+          exit 1
+
+      - name: Verify that test/test deleted.txt is restored
+        run: |
+          if [ ! -f "test/test deleted.txt" ]; then
+            echo "Expected: (test/test deleted.txt) to exist"
+            exit 1
+          else
+            cat "test/test deleted.txt"
+          fi
+
+      - name: Run changed-files with recover_deleted_files and recover_deleted_files_to_destination
+        id: changed-files-recover-deleted-files-to-destination
+        uses: ./
+        with:
+          base_sha: "fcdeb5b3d797752d95f6dbe98552a95c29dad338"
+          sha: "432e0c810c60ef1332850a971c5ec39022034b4c"
+          recover_deleted_files: true
+          recover_deleted_files_to_destination: "deleted_files"
+
+      - name: Show output
+        run: |
+          echo "${{ toJSON(steps.changed-files-recover-deleted-files-to-destination.outputs) }}"
+        shell:
+          bash
+
+      - name: Verify deleted files
+        if: steps.changed-files-recover-deleted-files-to-destination.outputs.deleted_files != 'test/test deleted.txt'
+        run: |
+          echo "Expected: (test/test deleted.txt) got ${{ steps.changed-files-recover-deleted-files-to-destination.outputs.deleted_files }}"
+          exit 1
+
+      - name: Verify that test/test deleted.txt is restored
+        run: |
+          if [ ! -f "deleted_files/test/test deleted.txt" ]; then
+            echo "Expected: (deleted_files/test/test deleted.txt) to exist"
+            exit 1
+          else
+            cat "deleted_files/test/test deleted.txt"
+          fi
+
   test:
     name: Test changed-files
     runs-on: ${{ matrix.platform }}

action.yml

@@ -145,6 +145,14 @@ inputs:
     description: "Output renamed files as deleted and added files."
     required: false
     default: "false"
+  recover_deleted_files:
+    description: "Recover deleted files."
+    required: false
+    default: "false"
+  recover_deleted_files_to_destination:
+    description: "Recover deleted files to a new destination directory, defaults to the original location."
+    required: false
+    default: ""
 
 outputs:
   added_files:

src/inputs.ts

@@ -37,6 +37,8 @@ export type Inputs = {
   writeOutputFiles: boolean
   outputDir: string
   outputRenamedFilesAsDeletedAndAdded: boolean
+  recoverDeletedFiles: boolean
+  recoverDeletedFilesToDestination: string
 }
 
 export const getInputs = (): Inputs => {
@@ -145,6 +147,13 @@ export const getInputs = (): Inputs => {
     'output_renamed_files_as_deleted_and_added',
     {required: false}
   )
+  const recoverDeletedFiles = core.getBooleanInput('recover_deleted_files', {
+    required: false
+  })
+  const recoverDeletedFilesToDestination = core.getInput(
+    'recover_deleted_files_to_destination',
+    {required: false}
+  )
 
   const inputs: Inputs = {
     files,
@@ -180,7 +189,9 @@ export const getInputs = (): Inputs => {
     sinceLastRemoteCommit,
     writeOutputFiles,
     outputDir,
-    outputRenamedFilesAsDeletedAndAdded
+    outputRenamedFilesAsDeletedAndAdded,
+    recoverDeletedFiles,
+    recoverDeletedFilesToDestination
   }
 
   if (fetchDepth) {

src/main.ts

@@ -1,6 +1,6 @@
 import * as core from '@actions/core'
 import path from 'path'
-import {getAllDiffFiles, getRenamedFiles} from './changedFiles'
+import {ChangeTypeEnum, getAllDiffFiles, getRenamedFiles} from './changedFiles'
 import {setChangedFilesOutput} from './changedFilesOutput'
 import {
   DiffResult,
@@ -14,6 +14,7 @@ import {
   getSubmodulePath,
   getYamlFilePatterns,
   isRepoShallow,
+  recoverDeletedFiles,
   setOutput,
   submoduleExists,
   updateGitGlobalConfig,
@@ -118,6 +119,13 @@ export async function run(): Promise<void> {
   core.info('All Done!')
   core.endGroup()
 
+  await recoverDeletedFiles({
+    inputs,
+    workingDirectory,
+    deletedFiles: allDiffFiles[ChangeTypeEnum.Deleted],
+    sha: diffResult.previousSha
+  })
+
   const filePatterns = await getFilePatterns({
     inputs,
     workingDirectory

src/utils.ts

@@ -1032,3 +1032,68 @@ export const setOutput = async ({
     await fs.writeFile(outputFilePath, cleanedValue.replace(/\\"/g, '"'))
   }
 }
+
+const getDeletedFileContents = async ({
+  cwd,
+  filePath,
+  sha
+}: {
+  cwd: string
+  filePath: string
+  sha: string
+}): Promise<string> => {
+  const {stdout, exitCode, stderr} = await exec.getExecOutput(
+    'git',
+    ['show', `${sha}:${filePath}`],
+    {
+      cwd,
+      silent: process.env.RUNNER_DEBUG !== '1',
+      ignoreReturnCode: true
+    }
+  )
+
+  if (exitCode !== 0) {
+    throw new Error(
+      `Error getting file content from git history "${filePath}": ${stderr}`
+    )
+  }
+
+  return stdout
+}
+
+export const recoverDeletedFiles = async ({
+  inputs,
+  workingDirectory,
+  deletedFiles,
+  sha
+}: {
+  inputs: Inputs
+  workingDirectory: string
+  deletedFiles: string[]
+  sha: string
+}): Promise<void> => {
+  if (inputs.recoverDeletedFiles) {
+    for (const deletedFile of deletedFiles) {
+      let target = path.join(workingDirectory, deletedFile)
+
+      if (inputs.recoverDeletedFilesToDestination) {
+        target = path.join(
+          workingDirectory,
+          inputs.recoverDeletedFilesToDestination,
+          deletedFile
+        )
+      }
+
+      const deletedFileContents = await getDeletedFileContents({
+        cwd: workingDirectory,
+        filePath: deletedFile,
+        sha
+      })
+
+      if (!(await exists(path.dirname(target)))) {
+        await fs.mkdir(path.dirname(target), {recursive: true})
+      }
+      await fs.writeFile(target, deletedFileContents)
+    }
+  }
+}