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63 lines
2.7 KiB
Bash
Executable File
63 lines
2.7 KiB
Bash
Executable File
#!/usr/bin/env bash
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# Copyright 2014 The Flutter Authors. All rights reserved.
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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# Based on the current repository state, writes on stdout the last commit in the
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# git tree that edited either `DEPS` or any file in the `engine/` sub-folder,
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# which is used to ensure `bin/internal/engine.version` is set correctly.
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#
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# ---------------------------------- NOTE ---------------------------------- #
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#
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# Please keep the logic in this file consistent with the logic in the
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# `last_engine_commit.ps1` script in the same directory to ensure that Flutter
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# continues to work across all platforms!
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#
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# https://github.com/flutter/flutter/blob/main/docs/tool/Engine-artifacts.md.
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#
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# Want to test this script?
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# $ cd dev/tools
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# $ dart test test/last_engine_commit_test.dart
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#
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# -------------------------------------------------------------------------- #
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set -e
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FLUTTER_ROOT="$(dirname "$(dirname "$(dirname "${BASH_SOURCE[0]}")")")"
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# 1. Determine when we diverged from master, and prevent set -e from exiting.
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MERGE_BASE_COMMIT="$(git merge-base HEAD master || echo "")"
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# If we did not find a merge-base, fail
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if [[ -z "$MERGE_BASE_COMMIT" ]]; then
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echo >&2 "Error: Could not determine a suitable engine commit."
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echo >&2 "Current branch: $(git rev-parse --abbrev-ref HEAD)"
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echo >&2 "Expected a different branch, from master"
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exit 1
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fi
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# 2. Define and search history range to searhc within (unique to changes on this branch).
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HISTORY_RANGE="$MERGE_BASE_COMMIT..HEAD"
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ENGINE_COMMIT="$(git log -1 --pretty=format:%H --ancestry-path "$HISTORY_RANGE" -- "$(git rev-parse --show-toplevel)/DEPS" "$(git rev-parse --show-toplevel)/engine")"
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# 3. If no engine-related commit was found within the current branch's history, fallback to the first commit on this branch.
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if [[ -z "$ENGINE_COMMIT" ]]; then
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# Find the oldest commit on HEAD that is *not* reachable from MERGE_BASE_COMMIT.
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# This is the first commit *on this branch* after it diverged from 'master'.
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ENGINE_COMMIT="$(git log --pretty=format:%H --reverse --ancestry-path "$MERGE_BASE_COMMIT"..HEAD | head -n 1)"
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# Final check: If even this fallback fails (which would be highly unusual if MERGE_BASE_COMMIT was found),
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# then something is truly wrong.
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if [[ -z "$ENGINE_COMMIT" ]]; then
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echo >&2 "Error: Unexpected state. MERGE_BASE_COMMIT was found ($MERGE_BASE_COMMIT), but no commits found on current branch after it."
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echo >&2 "Current branch: $(git rev-parse --abbrev-ref HEAD)"
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echo >&2 "History range searched for fallback: $HISTORY_RANGE"
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echo >&2 "All commits on current branch (for debug):"
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git log --pretty=format:%H
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exit 1
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fi
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fi
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echo "$ENGINE_COMMIT"
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