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changed-files/diff-sha.sh

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#!/usr/bin/env bash
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set -euo pipefail
INITIAL_COMMIT="false"
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GITHUB_OUTPUT=${GITHUB_OUTPUT:-""}
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EXTRA_ARGS="--no-tags --prune --no-recurse-submodules"
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PREVIOUS_SHA=""
CURRENT_SHA=""
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DIFF="..."
IS_TAG="false"
if [[ "$GITHUB_REF" == "refs/tags/"* ]]; then
IS_TAG="true"
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EXTRA_ARGS="--prune --no-recurse-submodules"
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fi
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if [[ -z $GITHUB_EVENT_PULL_REQUEST_BASE_REF || "$GITHUB_EVENT_HEAD_REPO_FORK" == "true" ]]; then
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DIFF=".."
fi
echo "::group::changed-files-diff-sha"
if [[ -n $INPUT_PATH ]]; then
REPO_DIR="$GITHUB_WORKSPACE/$INPUT_PATH"
echo "::debug::Resolving repository path: $REPO_DIR"
if [[ ! -d "$REPO_DIR" ]]; then
echo "::error::Invalid repository path: $REPO_DIR"
exit 1
fi
cd "$REPO_DIR"
fi
function __version() {
echo "$@" | awk -F. '{ printf("%d%03d%03d%03d\n", $1,$2,$3,$4); }';
}
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echo "Verifying git version..."
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GIT_VERSION=$(git --version | awk '{print $3}') && exit_status=$? || exit_status=$?
if [[ $exit_status -ne 0 ]]; then
echo "::error::git not installed"
exit 1
fi
if [[ $(__version "$GIT_VERSION") -lt $(__version "2.18.0") ]]; then
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echo "::error::Invalid git version. Please upgrade ($GIT_VERSION) to >= (2.18.0)"
exit 1
else
echo "Valid git version found: ($GIT_VERSION)"
fi
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if [[ -z $GITHUB_EVENT_PULL_REQUEST_BASE_REF ]]; then
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echo "Running on a push event..."
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TARGET_BRANCH=$GITHUB_REFNAME
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CURRENT_BRANCH=$TARGET_BRANCH
if [[ -f .git/shallow ]]; then
echo "Fetching remote refs..."
# shellcheck disable=SC2086
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git fetch $EXTRA_ARGS -u --progress --deepen="$INPUT_FETCH_DEPTH" origin "$CURRENT_BRANCH" 1>/dev/null || true
fi
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echo "::debug::Getting HEAD SHA..."
if [[ -n "$INPUT_UNTIL" ]]; then
echo "::debug::Getting HEAD SHA for '$INPUT_UNTIL'..."
CURRENT_SHA=$(git log -1 --format="%H" --date=local --until="$INPUT_UNTIL") && exit_status=$? || exit_status=$?
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if [[ $exit_status -ne 0 ]]; then
echo "::error::Invalid until date: $INPUT_UNTIL"
exit 1
fi
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else
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if [[ -z $INPUT_SHA ]]; then
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CURRENT_SHA=$(git rev-list -n 1 HEAD) && exit_status=$? || exit_status=$?
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else
CURRENT_SHA=$INPUT_SHA; exit_status=$?
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fi
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fi
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echo "::debug::Verifying the current commit SHA: $CURRENT_SHA"
git rev-parse --quiet --verify "$CURRENT_SHA^{commit}" 1>/dev/null 2>&1 && exit_status=$? || exit_status=$?
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if [[ $exit_status -ne 0 ]]; then
echo "::error::Unable to locate the current sha: $CURRENT_SHA"
echo "::error::Please verify that current sha is valid, and increase the fetch_depth to a number higher than $INPUT_FETCH_DEPTH."
exit 1
else
echo "::debug::Current SHA: $CURRENT_SHA"
fi
if [[ -z $INPUT_BASE_SHA ]]; then
if [[ -n "$INPUT_SINCE" ]]; then
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echo "::debug::Getting base SHA for '$INPUT_SINCE'..."
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PREVIOUS_SHA=$(git log --format="%H" --date=local --since="$INPUT_SINCE" | tail -1) && exit_status=$? || exit_status=$?
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if [[ -z "$PREVIOUS_SHA" ]]; then
echo "::error::Unable to locate a previous commit for the specified date: $INPUT_SINCE"
exit 1
fi
else
if [[ "$INPUT_SINCE_LAST_REMOTE_COMMIT" == "true" ]]; then
PREVIOUS_SHA=""
if [[ "$GITHUB_EVENT_FORCED" == "false" || -z "$GITHUB_EVENT_FORCED" ]]; then
PREVIOUS_SHA=$GITHUB_EVENT_BEFORE && exit_status=$? || exit_status=$?
else
PREVIOUS_SHA=$(git rev-list -n 1 "HEAD^") && exit_status=$? || exit_status=$?
fi
else
PREVIOUS_SHA=$(git rev-list -n 1 "HEAD^") && exit_status=$? || exit_status=$?
fi
if [[ -z "$PREVIOUS_SHA" || "$PREVIOUS_SHA" == "0000000000000000000000000000000000000000" ]]; then
PREVIOUS_SHA=$(git rev-list -n 1 "HEAD^") && exit_status=$? || exit_status=$?
fi
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if [[ "$PREVIOUS_SHA" == "$CURRENT_SHA" ]]; then
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if ! git rev-parse "$PREVIOUS_SHA^1" &>/dev/null; then
INITIAL_COMMIT="true"
PREVIOUS_SHA=$(git rev-parse "$CURRENT_SHA")
echo "::warning::Initial commit detected no previous commit found."
else
PREVIOUS_SHA=$(git rev-parse "$PREVIOUS_SHA^1")
fi
else
if [[ -z "$PREVIOUS_SHA" ]]; then
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echo "::error::Unable to locate a previous commit."
exit 1
fi
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fi
fi
else
PREVIOUS_SHA=$INPUT_BASE_SHA
if [[ "$IS_TAG" == "true" ]]; then
TARGET_BRANCH=$(git describe --tags "$PREVIOUS_SHA")
fi
fi
echo "::debug::Target branch $TARGET_BRANCH..."
echo "::debug::Current branch $CURRENT_BRANCH..."
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echo "::debug::Verifying the previous commit SHA: $PREVIOUS_SHA"
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git rev-parse --quiet --verify "$PREVIOUS_SHA^{commit}" 1>/dev/null 2>&1 && exit_status=$? || exit_status=$?
if [[ $exit_status -ne 0 ]]; then
echo "::error::Unable to locate the previous sha: $PREVIOUS_SHA"
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echo "::error::Please verify that the previous sha commit is valid, and increase the fetch_depth to a number higher than $INPUT_FETCH_DEPTH."
exit 1
fi
else
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echo "Running on a pull request event..."
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TARGET_BRANCH=$GITHUB_EVENT_PULL_REQUEST_BASE_REF
CURRENT_BRANCH=$GITHUB_EVENT_PULL_REQUEST_HEAD_REF
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if [[ "$INPUT_SINCE_LAST_REMOTE_COMMIT" == "true" ]]; then
TARGET_BRANCH=$CURRENT_BRANCH
fi
if [[ -f .git/shallow ]]; then
echo "Fetching remote refs..."
# shellcheck disable=SC2086
git fetch $EXTRA_ARGS -u --progress origin pull/"$GITHUB_EVENT_PULL_REQUEST_NUMBER"/head:"$CURRENT_BRANCH" 1>/dev/null
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if [[ "$INPUT_SINCE_LAST_REMOTE_COMMIT" != "true" ]]; then
echo "::debug::Fetching remote target branch..."
# shellcheck disable=SC2086
git fetch $EXTRA_ARGS -u --progress --deepen="$INPUT_FETCH_DEPTH" origin "$TARGET_BRANCH:$TARGET_BRANCH" 1>/dev/null
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fi
fi
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echo "::debug::Getting HEAD SHA..."
if [[ -n "$INPUT_UNTIL" ]]; then
echo "::debug::Getting HEAD SHA for '$INPUT_UNTIL'..."
CURRENT_SHA=$(git log -1 --format="%H" --date=local --until="$INPUT_UNTIL") && exit_status=$? || exit_status=$?
if [[ $exit_status -ne 0 ]]; then
echo "::error::Invalid until date: $INPUT_UNTIL"
exit 1
fi
else
if [[ -z $INPUT_SHA ]]; then
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CURRENT_SHA=$(git rev-list -n 1 HEAD) && exit_status=$? || exit_status=$?
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else
CURRENT_SHA=$INPUT_SHA; exit_status=$?
fi
fi
echo "::debug::Verifying the current commit SHA: $CURRENT_SHA"
git rev-parse --quiet --verify "$CURRENT_SHA^{commit}" 1>/dev/null 2>&1 && exit_status=$? || exit_status=$?
if [[ $exit_status -ne 0 ]]; then
echo "::error::Unable to locate the current sha: $CURRENT_SHA"
echo "::error::Please verify that current sha is valid, and increase the fetch_depth to a number higher than $INPUT_FETCH_DEPTH."
exit 1
else
echo "::debug::Current SHA: $CURRENT_SHA"
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fi
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if [[ -z $INPUT_BASE_SHA ]]; then
if [[ "$INPUT_SINCE_LAST_REMOTE_COMMIT" == "true" ]]; then
PREVIOUS_SHA=$GITHUB_EVENT_BEFORE
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if ! git rev-parse --quiet --verify "$PREVIOUS_SHA^{commit}" 1>/dev/null 2>&1; then
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PREVIOUS_SHA=$GITHUB_EVENT_PULL_REQUEST_BASE_SHA
fi
else
PREVIOUS_SHA=$(git rev-parse origin/"$TARGET_BRANCH") && exit_status=$? || exit_status=$?
if [[ -f .git/shallow ]]; then
# check if the merge base is in the local history
if ! git merge-base "$PREVIOUS_SHA" "$CURRENT_SHA"; then
echo "::debug::Merge base is not in the local history, fetching remote target branch..."
# Fetch more of the target branch history until the merge base is found
for i in {1..10}; do
# shellcheck disable=SC2086
git fetch $EXTRA_ARGS -u --progress --deepen="$INPUT_FETCH_DEPTH" origin "$TARGET_BRANCH:$TARGET_BRANCH" 1>/dev/null
if git merge-base "$PREVIOUS_SHA" "$CURRENT_SHA"; then
break
fi
echo "::debug::Merge base is not in the local history, fetching remote target branch again..."
echo "::debug::Attempt $i/10"
done
fi
fi
fi
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if [[ -z "$PREVIOUS_SHA" || "$PREVIOUS_SHA" == "$CURRENT_SHA" ]]; then
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PREVIOUS_SHA=$GITHUB_EVENT_PULL_REQUEST_BASE_SHA && exit_status=$? || exit_status=$?
fi
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echo "::debug::Previous SHA: $PREVIOUS_SHA"
else
PREVIOUS_SHA=$INPUT_BASE_SHA && exit_status=$? || exit_status=$?
fi
if ! git diff --name-only --ignore-submodules=all "$PREVIOUS_SHA$DIFF$CURRENT_SHA" 1>/dev/null 2>&1; then
DIFF=".."
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fi
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echo "::debug::Target branch: $TARGET_BRANCH"
echo "::debug::Current branch: $CURRENT_BRANCH"
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echo "::debug::Verifying the previous commit SHA: $PREVIOUS_SHA"
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git rev-parse --quiet --verify "$PREVIOUS_SHA^{commit}" 1>/dev/null 2>&1 && exit_status=$? || exit_status=$?
if [[ $exit_status -ne 0 ]]; then
echo "::error::Unable to locate the previous sha: $PREVIOUS_SHA"
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echo "::error::Please verify that the previous sha is valid, and increase the fetch_depth to a number higher than $INPUT_FETCH_DEPTH."
exit 1
fi
if ! git diff --name-only --ignore-submodules=all "$PREVIOUS_SHA$DIFF$CURRENT_SHA" 1>/dev/null 2>&1; then
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echo "::error::Unable to determine a difference between $PREVIOUS_SHA$DIFF$CURRENT_SHA"
exit 1
fi
fi
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if [[ "$PREVIOUS_SHA" == "$CURRENT_SHA" && "$INITIAL_COMMIT" == "false" ]]; then
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echo "::error::Similar commit hashes detected: previous sha: $PREVIOUS_SHA is equivalent to the current sha: $CURRENT_SHA."
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echo "::error::Please verify that both commits are valid, and increase the fetch_depth to a number higher than $INPUT_FETCH_DEPTH."
exit 1
fi
if [[ -z "$GITHUB_OUTPUT" ]]; then
echo "::set-output name=target_branch::$TARGET_BRANCH"
echo "::set-output name=current_branch::$CURRENT_BRANCH"
echo "::set-output name=previous_sha::$PREVIOUS_SHA"
echo "::set-output name=current_sha::$CURRENT_SHA"
echo "::set-output name=diff::$DIFF"
else
cat <<EOF >> "$GITHUB_OUTPUT"
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target_branch=$TARGET_BRANCH
current_branch=$CURRENT_BRANCH
previous_sha=$PREVIOUS_SHA
current_sha=$CURRENT_SHA
diff=$DIFF
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EOF
fi
echo "::endgroup::"