Improve error handling (#263)

* Improve error handling

Fixes: #255

* Update entrypoint.sh

* Update entrypoint.sh

* Update error checking

* Update test.yml

* Update test.yml

* Update test.yml

* Update entrypoint.sh

* Update action.yml

* Update entrypoint.sh

* Update entrypoint.sh

* Update entrypoint.sh

* Update test.yml

* Update entrypoint.sh

* Update test.yml

* Update test.yml

* Update test.yml

* Update entrypoint.sh

* Update entrypoint.sh

* Update entrypoint.sh

* Update test.yml

.github/workflows/test.yml

@@ -73,8 +73,8 @@ jobs:
         shell:
           bash
 
-  test-no-head-sha:
+  test-non-existent-base-sha:
-    name: Test changed-files missing head sha
+    name: Test changed-files non existent base sha
     runs-on: ${{ matrix.platform }}
     strategy:
       fail-fast: false
@@ -85,10 +85,12 @@ jobs:
       - name: Checkout to branch
         uses: actions/checkout@v2
 
-      - name: Run changed-files with defaults
+      - name: Run changed-files with non existent base sha
         id: changed-files
-        continue-on-error: true
         uses: ./
+        continue-on-error: true
+        with:
+          base_sha: "4554456"
 
       - name: Show output
         run: |
@@ -96,6 +98,59 @@ jobs:
         shell:
           bash
           
+      - name: Run changed-files-specific with non existent base sha
+        id: changed-files-specific
+        uses: ./
+        continue-on-error: true
+        with:
+          files: action.yml
+          base_sha: "4554456"
+
+      - name: Show output
+        run: |
+          echo "${{ toJSON(steps.changed-files-specific.outputs) }}"
+        shell:
+          bash
+
+  test-non-existent-sha:
+    name: Test changed-files non existent sha
+    runs-on: ${{ matrix.platform }}
+    strategy:
+      fail-fast: false
+      matrix:
+        platform: [ubuntu-latest, windows-latest, macos-latest, macos-11, ubuntu-18.04, windows-2022, windows-2016]
+
+    steps:
+      - name: Checkout to branch
+        uses: actions/checkout@v2
+
+      - name: Run changed-files with non existent sha
+        id: changed-files
+        uses: ./
+        continue-on-error: true
+        with:
+          base_sha: "4554456"
+
+      - name: Show output
+        run: |
+          echo "${{ toJSON(steps.changed-files.outputs) }}"
+        shell:
+          bash
+          
+      - name: Run changed-files-specific with non existent sha
+        id: changed-files-specific
+        uses: ./
+        continue-on-error: true
+        with:
+          files: action.yml
+          base_sha: "4554456"
+
+      - name: Show output
+        run: |
+          echo "${{ toJSON(steps.changed-files-specific.outputs) }}"
+        shell:
+          bash
+
   test:
     name: Test changed-files
     runs-on: ${{ matrix.platform }}

action.yml

@@ -95,7 +95,7 @@ runs:
         INPUT_FILES: ${{ inputs.files }}
         INPUT_FILES_FROM_SOURCE_FILE: ${{ inputs.files_from_source_file }}
     - run: |
-        # "Set up the bash sha..."
+        # "Set base sha..."
         if [[ -n "${{ inputs.base_sha }}" ]]; then
           echo "::set-output name=base_sha::${{ inputs.base_sha }}"
         elif [[ "${{ inputs.since_last_remote_commit }}" == "true" ]]; then

entrypoint.sh

@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 
-set -e
+set -eu
 
 echo "::group::changed-files"
 
@@ -37,8 +37,12 @@ else
   CURRENT_SHA=$INPUT_SHA && exit_status=$? || exit_status=$?
 fi
 
+git rev-parse --quiet --verify "$CURRENT_SHA^{commit}" 1>/dev/null 2>&1 && exit_status=$? || exit_status=$?
+
+
 if [[ $exit_status -ne 0 ]]; then
-  echo "::warning::Unable to determine the current head sha"
+  echo "::warning::Unable to locate the current sha: $CURRENT_SHA"
+  echo "::warning::You seem to be missing 'fetch-depth: 0' or 'fetch-depth: 2'. See https://github.com/tj-actions/changed-files#usage"
   git remote remove temp_changed_files
   exit 1
 fi
@@ -53,8 +57,10 @@ if [[ -z $GITHUB_BASE_REF ]]; then
     PREVIOUS_SHA=$INPUT_BASE_SHA && exit_status=$? || exit_status=$?
   fi
   
+  git rev-parse --quiet --verify "$PREVIOUS_SHA^{commit}" 1>/dev/null 2>&1 && exit_status=$? || exit_status=$?
+
   if [[ $exit_status -ne 0 ]]; then
-    echo "::warning::Unable to determine the previous commit sha"
+    echo "::warning::Unable to locate the previous sha: $PREVIOUS_SHA"
     echo "::warning::You seem to be missing 'fetch-depth: 0' or 'fetch-depth: 2'. See https://github.com/tj-actions/changed-files#usage"
     git remote remove temp_changed_files
     exit 1
@@ -64,15 +70,17 @@ else
   CURRENT_BRANCH=$GITHUB_HEAD_REF
 
   if [[ -z $INPUT_BASE_SHA ]]; then
-    git fetch --no-tags -u --progress --depth=1 temp_changed_files "${TARGET_BRANCH}":"${TARGET_BRANCH}"
+    git fetch --no-tags -u --progress --depth=1 temp_changed_files "${TARGET_BRANCH}":"${TARGET_BRANCH}" && exit_status=$? || exit_status=$?
     PREVIOUS_SHA=$(git rev-parse "${TARGET_BRANCH}" 2>&1) && exit_status=$? || exit_status=$?
   else
-    git fetch --no-tags -u --progress --depth=1 temp_changed_files "$INPUT_BASE_SHA"
+    git fetch --no-tags -u --progress --depth=1 temp_changed_files "$INPUT_BASE_SHA" && exit_status=$? || exit_status=$?
     PREVIOUS_SHA=$INPUT_BASE_SHA
   fi
   
+  git rev-parse --quiet --verify "$PREVIOUS_SHA^{commit}" 1>/dev/null 2>&1 && exit_status=$? || exit_status=$?
+
   if [[ $exit_status -ne 0 ]]; then
-    echo "::warning::Unable to determine the base ref sha for ${TARGET_BRANCH}"
+    echo "::warning::Unable to locate the previous sha: $PREVIOUS_SHA"
     echo "::warning::You seem to be missing 'fetch-depth: 0' or 'fetch-depth: 2'. See https://github.com/tj-actions/changed-files#usage"
     git remote remove temp_changed_files
     exit 1
@@ -81,8 +89,9 @@ fi
 
 echo "Retrieving changes between $PREVIOUS_SHA ($TARGET_BRANCH) → $CURRENT_SHA ($CURRENT_BRANCH)"
 
+echo "Getting diff..."
+
 if [[ -z "${INPUT_FILES[*]}" ]]; then
-  echo "Getting diff..."
   ADDED=$(git diff --diff-filter=A --name-only "$PREVIOUS_SHA" "$CURRENT_SHA" | awk -v d="$INPUT_SEPARATOR" '{s=(NR==1?s:s d)$0}END{print s}')
   COPIED=$(git diff --diff-filter=C --name-only "$PREVIOUS_SHA" "$CURRENT_SHA" | awk -v d="$INPUT_SEPARATOR" '{s=(NR==1?s:s d)$0}END{print s}')
   DELETED=$(git diff --diff-filter=D --name-only "$PREVIOUS_SHA" "$CURRENT_SHA" | awk -v d="$INPUT_SEPARATOR" '{s=(NR==1?s:s d)$0}END{print s}')
@@ -94,7 +103,6 @@ if [[ -z "${INPUT_FILES[*]}" ]]; then
   ALL_CHANGED_AND_MODIFIED=$(git diff --diff-filter="*ACDMRTUX" --name-only "$PREVIOUS_SHA" "$CURRENT_SHA" | awk -v d="$INPUT_SEPARATOR" '{s=(NR==1?s:s d)$0}END{print s}')
   ALL_MODIFIED=$(git diff --diff-filter="ACMR" --name-only "$PREVIOUS_SHA" "$CURRENT_SHA" | awk -v d="$INPUT_SEPARATOR" '{s=(NR==1?s:s d)$0}END{print s}')
 else
-
   echo "Input files: ${INPUT_FILES[*]}"
 
   FILES=$(echo "${INPUT_FILES[*]}" | awk '{gsub(/ /,"\n"); print $0;}' | awk -v d="|" '{s=(NR==1?s:s d)$0}END{print s}')