From 53afe7a5b555e08df29ddc72d648ef951725b6be Mon Sep 17 00:00:00 2001
From: Krasimir Nikolov <krasimir.nikolov1994@gmail.com>
Date: Wed, 14 Jul 2021 23:57:17 +0300
Subject: [PATCH] Add custom source sha (#126)

Co-authored-by: Tonye Jack <jtonye@ymail.com>
---
 .github/workflows/test.yml | 10 ++++++++++
 README.md                  |  5 +++++
 action.yml                 |  6 +++++-
 entrypoint.sh              |  4 ++--
 4 files changed, 22 insertions(+), 3 deletions(-)

diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index ede3f60e..3290a077 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -130,3 +130,13 @@ jobs:
           echo "${{ toJSON(steps.changed-files-specific-comma.outputs) }}"
         shell:
           bash
+      - name: Run changed-files with custom sha
+        id: changed-files-custom-sha
+        uses: ./
+        with:
+          sha: ${{ github.event.pull_request.head.sha }}
+      - name: Show output
+        run: |
+          echo "${{ toJSON(steps.changed-files-custom-sha.outputs) }}"
+        shell:
+          bash
diff --git a/README.md b/README.md
index bdeeb595..e9f419aa 100644
--- a/README.md
+++ b/README.md
@@ -149,6 +149,11 @@ jobs:
          if: steps.changed-files-specific.outputs.any_changed == 'true'
          run: |
            echo "One or more files listed above has changed."
+      - name: Use a different commit SHA as the base
+        id: changed-files-comma
+        uses: tj-actions/changed-files@v8.4
+        with:
+          sha: ${{ github.event.pull_request.head.sha }}
         
 ```
 
diff --git a/action.yml b/action.yml
index 55c9b78b..60b84e17 100644
--- a/action.yml
+++ b/action.yml
@@ -14,6 +14,10 @@ inputs:
     description: 'Check for changes using only this list of files (Defaults to the entire repo)'
     required: false
     default: ""
+  sha:
+    description: 'Specify a different commit SHA to be used for comparing changes'
+    required: true
+    default: ${{ github.sha }}
 
 outputs:
   added_files:
@@ -58,11 +62,11 @@ runs:
       id: changed-files
       shell: bash
       env:
-        GITHUB_SHA: ${{ github.sha }}
         GITHUB_BASE_REF: ${{ github.base_ref }}
         GITHUB_REPOSITORY: ${{ github.repository }}
         # INPUT_<VARIABLE_NAME> is not available in Composite run steps
         # https://github.community/t/input-variable-name-is-not-available-in-composite-run-steps/127611
+        INPUT_SHA: ${{ inputs.sha }}
         INPUT_TOKEN: ${{ inputs.token }}
         INPUT_FILES: ${{ inputs.files }}
         INPUT_SEPARATOR: ${{ inputs.separator }}
diff --git a/entrypoint.sh b/entrypoint.sh
index c2872c4c..390eb7b3 100755
--- a/entrypoint.sh
+++ b/entrypoint.sh
@@ -8,10 +8,10 @@ git remote set-url origin "https://${INPUT_TOKEN}@github.com/${GITHUB_REPOSITORY
 
 echo "Getting HEAD info..."
 
-if [[ -z $GITHUB_SHA ]]; then
+if [[ -z $INPUT_SHA ]]; then
   CURR_SHA=$(git rev-parse HEAD 2>&1) && exit_status=$? || exit_status=$?
 else
-  CURR_SHA=$GITHUB_SHA
+  CURR_SHA=$INPUT_SHA
 fi
 
 if [[ $exit_status -ne 0 ]]; then