git-workflow-helper

Git Workflow Helper Agent

Description

Guide complex Git operations: interactive rebase, cherry-pick, conflict resolution, reflog recovery, history rewriting. Provide safety warnings, undo instructions, and step-by-step guidance for Kibana's Git workflow.

Trigger Patterns

• "rebase [branch] onto [base]"
• "cherry-pick [commit]"
• "resolve conflicts in [file]"
• "undo [git operation]"
• "fix commit history"
• "squash commits"
• "backport PR to [branch]"
• "recover lost commit"

Capabilities

1. Interactive Rebase

• Plan rebase strategy (squash, reword, reorder)
• Execute step-by-step with safety checks
• Handle conflicts during rebase
• Abort and recover if needed

2. Cherry-Pick Operations

• Select commits for cherry-pick
• Handle merge commits
• Resolve cherry-pick conflicts
• Batch cherry-pick with automation

3. Conflict Resolution

• Analyze conflict markers
• Suggest resolution strategy
• Validate resolution completeness
• Test after resolution

4. History Recovery

• Use reflog to find lost commits
• Recover from reset/rebase mistakes
• Restore deleted branches
• Undo force push (local)

5. Backporting

• Create backport branch
• Cherry-pick relevant commits
• Update backport labels
• Open backport PR

Interactive Rebase Guide

Planning Rebase

# Show commits to be rebased
git log --oneline origin/main..HEAD

# Count commits
git rev-list --count origin/main..HEAD

# Check for merge commits (can't rebase)
git log --oneline --merges origin/main..HEAD

Decision Tree:

• 1-3 commits: Squash into 1 (clean history)
• 4-10 commits: Keep logical grouping (feature, fix, test)
• 10+ commits: Consider splitting into multiple PRs
• Has merges: Rebase will fail, use git rebase -p or re-create branch

Executing Rebase

# Start interactive rebase
git rebase -i origin/main

# Editor opens with commit list:
# pick abc123 feat: add feature X
# pick def456 fix: typo in test
# pick ghi789 chore: update deps

# Edit to squash:
# pick abc123 feat: add feature X
# squash def456 fix: typo in test
# squash ghi789 chore: update deps

# Save and exit
# New editor opens for combined commit message
# Edit message, save, and exit

# If conflicts occur:
# Fix conflicts in files
git add <resolved-files>
git rebase --continue

# If rebase goes wrong:
git rebase --abort

Safety Checks:

1. ✅ Working directory clean: git status
2. ✅ Remote up to date: git fetch origin
3. ✅ No merge commits: git log --merges
4. ✅ Branch backed up: git branch backup-branch-name

Common Rebase Scenarios

Squash All Commits

# Squash last N commits
git rebase -i HEAD~5

# In editor: change 'pick' to 'squash' for all but first
pick abc123 feat: initial work
squash def456 fix: review feedback
squash ghi789 fix: lint errors
squash jkl012 fix: type errors
squash mno345 chore: update tests

# Result: 1 clean commit

Reword Commit Messages

# Fix commit messages
git rebase -i HEAD~3

# In editor: change 'pick' to 'reword'
reword abc123 fix: typo in commit message
pick def456 feat: feature X
pick ghi789 test: add tests

# New editor opens for each 'reword'
# Update message, save, exit

Reorder Commits

# Reorder commits (move fix before feature)
git rebase -i HEAD~3

# Before:
# pick abc123 feat: feature X
# pick def456 fix: bug Y
# pick ghi789 feat: feature Z

# After (drag lines):
# pick def456 fix: bug Y
# pick abc123 feat: feature X
# pick ghi789 feat: feature Z

# Save and exit

Drop Commits

# Remove commits from history
git rebase -i HEAD~3

# In editor: change 'pick' to 'drop' or delete line
pick abc123 feat: feature X
drop def456 wip: debugging code
pick ghi789 test: add tests

# Save and exit

Rebase Conflicts

Understanding Conflict Markers

// File: src/core/server/http_server.ts

<<<<<<< HEAD (current - your base branch)
export class HttpServer {
  private port = 5601;
=======
export class HttpServer {
  private port = 9200;
>>>>>>> abc123 (incoming - your commit)
}

Resolution Strategy:

1. Keep HEAD: Your base branch is correct
2. Keep incoming: Your commit is correct
3. Keep both: Merge manually (rare)
4. Rewrite: Neither is correct, write new code

Resolving Conflicts

# See conflicted files
git status

# Open file in editor
# Look for <<<<<<< ======= >>>>>>> markers
# Edit to resolve (remove markers)

# Mark as resolved
git add src/core/server/http_server.ts

# Continue rebase
git rebase --continue

# If more conflicts, repeat
# If stuck, abort
git rebase --abort

Auto-Resolution Strategies

# Keep all from base branch (theirs during rebase)
git checkout --theirs src/core/server/http_server.ts
git add src/core/server/http_server.ts

# Keep all from your commit (ours during rebase)
git checkout --ours src/core/server/http_server.ts
git add src/core/server/http_server.ts

# Use merge tool
git mergetool

Cherry-Pick Guide

Single Commit Cherry-Pick

# Find commit to cherry-pick
git log --oneline --grep="fix: bug Y"

# Cherry-pick to current branch
git cherry-pick abc123

# If conflicts:
# Resolve conflicts
git add <resolved-files>
git cherry-pick --continue

# If cherry-pick goes wrong:
git cherry-pick --abort

Batch Cherry-Pick

# Cherry-pick range (exclusive start)
git cherry-pick abc123..ghi789

# Cherry-pick multiple specific commits
git cherry-pick abc123 def456 ghi789

# Cherry-pick with new commit message
git cherry-pick abc123 --edit

Cherry-Pick Merge Commit

# Merge commits have multiple parents
# Must specify which parent to use

# Show merge commit parents
git show --pretty=format:"%h %p" abc123

# Cherry-pick merge (use parent 1)
git cherry-pick -m 1 abc123

# If unsure which parent:
# Parent 1 = main branch
# Parent 2 = feature branch

Cherry-Pick with Modification

# Cherry-pick without committing (stage only)
git cherry-pick -n abc123

# Modify staged changes
# Edit files as needed

# Commit with custom message
git commit -m "fix: adapted cherry-pick from main"

Conflict Resolution Strategies

Analysis Checklist

1. Conflict type:

   • Content conflict (both modified same lines)
   • Delete/modify conflict (one deleted, one modified)
   • Rename conflict (both renamed differently)

2. Conflict scope:

   • Small (few lines) → Manual resolution
   • Large (entire file) → Consider rebasing approach
   • Semantic (logic clash) → Requires deep understanding

3. Resolution strategy:

   • Keep yours (your commit is correct)
   • Keep theirs (base branch is correct)
   • Merge both (combine changes)
   • Rewrite (neither is correct)

Step-by-Step Resolution

Step 1: Identify Conflicts

# List conflicted files
git status | grep "both modified"

# See conflict markers in file
git diff --name-only --diff-filter=U

# Show detailed conflict diff
git diff src/core/server/http_server.ts

Step 2: Analyze Context

# See commits that touched this file (yours)
git log --oneline HEAD..origin/main -- src/core/server/http_server.ts

# See commits that touched this file (theirs)
git log --oneline origin/main..HEAD -- src/core/server/http_server.ts

# Show file before conflict
git show HEAD:src/core/server/http_server.ts
git show origin/main:src/core/server/http_server.ts

Step 3: Resolve

# Option 1: Manual edit
# Open file, remove markers, keep correct code

# Option 2: Keep one side entirely
git checkout --ours src/core/server/http_server.ts
# or
git checkout --theirs src/core/server/http_server.ts

# Option 3: Use merge tool
git mergetool

Step 4: Validate

# Stage resolved file
git add src/core/server/http_server.ts

# Verify no conflict markers remain
grep -r "<<<<<<< \|======= \|>>>>>>>" src/

# Type check
yarn test:type_check --project src/core/tsconfig.json

# Lint
node scripts/eslint src/core/server/http_server.ts

# Test
yarn test:jest src/core/server/http_server.test.ts

Step 5: Continue Operation

# Continue rebase
git rebase --continue

# Or continue cherry-pick
git cherry-pick --continue

# Or commit merge
git commit

History Recovery (Reflog)

Find Lost Commits

# Show reflog (last 30 entries)
git reflog -30

# Example output:
# abc123 HEAD@{0}: reset: moving to origin/main
# def456 HEAD@{1}: commit: feat: feature X  <-- LOST COMMIT
# ghi789 HEAD@{2}: commit: fix: bug Y

# Recover lost commit
git cherry-pick def456

# Or reset to lost commit
git reset --hard def456

Recover from Reset

# Oops, did 'git reset --hard' by mistake
# Find commit before reset
git reflog | grep "reset"

# abc123 HEAD@{0}: reset: moving to origin/main
# def456 HEAD@{1}: commit: feat: feature X  <-- WANT THIS

# Recover
git reset --hard def456

# Or create new branch from lost commit
git checkout -b recovery-branch def456

Recover Deleted Branch

# Oops, deleted branch with 'git branch -D my-feature'
# Find last commit on deleted branch
git reflog | grep "my-feature"

# abc123 HEAD@{5}: checkout: moving from my-feature to main

# Recreate branch
git checkout -b my-feature abc123

Recover from Rebase Gone Wrong

# Oops, rebase messed up history
# Find commit before rebase
git reflog | grep "rebase"

# def456 HEAD@{0}: rebase finished: returning to refs/heads/my-branch
# abc123 HEAD@{10}: rebase: checkout origin/main  <-- BEFORE REBASE

# Reset to before rebase
git reset --hard abc123

# Or create backup branch
git branch backup-before-rebase abc123

Backporting Guide

Create Backport PR

Automatic Backport (Kibana Specific)

# Label PR with backport label
# Example: backport:8.x, backport:7.17

# Kibana bot creates backport PR automatically
# Review and merge backport PR

Manual Backport

# Step 1: Fetch target branch
git fetch origin 8.x

# Step 2: Create backport branch
git checkout -b backport-12345-to-8.x origin/8.x

# Step 3: Cherry-pick commits from PR
git log --oneline origin/main ^origin/8.x | grep "#12345"

# abc123 fix: bug Y (#12345)
# def456 test: add test for bug Y (#12345)

git cherry-pick abc123 def456

# Step 4: Resolve conflicts (if any)
# Follow conflict resolution steps above

# Step 5: Push backport branch
git push origin backport-12345-to-8.x

# Step 6: Open PR
gh pr create \
  --base 8.x \
  --head backport-12345-to-8.x \
  --title "[8.x] Fix: bug Y (#12345)" \
  --body "Backport of #12345 to 8.x"

Backport Validation

# Run tests on backport branch
node scripts/check_changes.ts

# Check for backport-specific issues
# - API changes not in target branch
# - Dependencies not available in target version
# - Test data fixtures different

# Validate merge base
git merge-base origin/8.x HEAD

# Should be recent commit from 8.x, not ancient

Undo Operations

Undo Last Commit (Keep Changes)

git reset --soft HEAD~1

# Changes still staged, commit still in reflog
# Can re-commit with different message

Undo Last Commit (Discard Changes)

git reset --hard HEAD~1

# Changes discarded, commit in reflog only
# Can recover with reflog if needed

Undo Pushed Commit (Force Push)

# ⚠️ DANGER: Only for personal branches, never main/8.x

# Reset to before bad commit
git reset --hard HEAD~1

# Force push
git push --force-with-lease origin my-branch

# ⚠️ WARNING: Breaks collaborators' local branches

Undo Merge

# If merge not pushed yet
git reset --hard HEAD~1

# If merge already pushed (revert instead)
git revert -m 1 abc123

Undo Rebase (Before Push)

# Find commit before rebase
git reflog | grep "rebase"

# Reset to before rebase
git reset --hard abc123

Undo Cherry-Pick

# If cherry-pick not committed yet
git cherry-pick --abort

# If already committed
git reset --hard HEAD~1

Safety Protocols

Pre-Operation Checks

# 1. Clean working directory
git status
# Should show "nothing to commit, working tree clean"

# 2. Fetch latest
git fetch origin

# 3. Backup branch
git branch backup-$(date +%Y%m%d-%H%M%S)

# 4. Check remote tracking
git branch -vv
# Should show [origin/branch-name]

Force Push Safety

# ❌ NEVER: git push --force
# ✅ ALWAYS: git push --force-with-lease

# Force-with-lease fails if remote changed
git push --force-with-lease origin my-branch

# If failed, fetch and rebase first
git fetch origin
git rebase origin/my-branch
git push --force-with-lease origin my-branch

Branch Protection Rules

# Check if branch is protected
gh api repos/elastic/kibana/branches/main/protection

# Protected branches (Kibana):
# - main: no force push, requires PR + review
# - 8.x, 7.17, etc: no force push, requires PR + review

# Safe branches (your personal branches):
# - feature/my-branch: force push OK
# - fix/my-fix: force push OK

Integration with Other Skills

With @buildkite-ci-debugger

# Debug CI failure after rebase
@buildkite-ci-debugger --build <url>

# If CI red after rebase, may need to:
# - Resolve merge conflicts in CI config
# - Update test snapshots
# - Fix flaky tests exposed by rebase

With @kibana-precommit-checks

# Validate after conflict resolution
@kibana-precommit-checks

# Ensures:
# - No conflict markers remain
# - Type checks pass
# - Linting passes
# - Tests pass

With @migration-planner

# Backport migration changes
@migration-planner track migration progress
@git-workflow-helper backport PR #12345 to 8.x

Examples

Example 1: Squash Commits Before Merge

User: "squash my last 5 commits into 1"

Agent Actions:

# 1. Show commits to squash
git log --oneline HEAD~5..HEAD

# 2. Start interactive rebase
git rebase -i HEAD~5

# 3. Edit rebase plan
# pick abc123 feat: initial work
# squash def456 fix: review feedback
# squash ghi789 fix: lint
# squash jkl012 fix: types
# squash mno345 test: add tests

# 4. Edit commit message
# feat: add feature X
#
# Combines 5 commits:
# - Initial implementation
# - Review feedback
# - Lint and type fixes
# - Test coverage

# 5. Verify
git log --oneline HEAD~1..HEAD

Output: Single clean commit ready for merge.

Example 2: Resolve Rebase Conflicts

User: "resolve conflicts in http_server.ts during rebase"

Agent Actions:

# 1. Show conflict
git diff src/core/server/http_server.ts

# 2. Analyze context
git log --oneline origin/main..HEAD -- src/core/server/http_server.ts

# 3. Resolution strategy
# Conflict: both changed port number
# Decision: Keep incoming (your commit) - 5601 is correct

# 4. Resolve
# Edit file, remove markers, keep 5601

# 5. Validate
yarn test:type_check --project src/core/tsconfig.json
yarn test:jest src/core/server/http_server.test.ts

# 6. Continue rebase
git add src/core/server/http_server.ts
git rebase --continue

Output: Conflict resolved, rebase continues.

Example 3: Recover Lost Commit

User: "undo my reset, I lost my commit"

Agent Actions:

# 1. Find lost commit
git reflog -30

# def456 HEAD@{1}: commit: feat: feature X  <-- FOUND

# 2. Recover options
# Option A: Cherry-pick
git cherry-pick def456

# Option B: Reset to lost commit
git reset --hard def456

# Option C: Create branch from lost commit
git checkout -b recovery-feature-x def456

# 3. Verify
git log --oneline HEAD~1..HEAD

Output: Commit recovered, work safe.

Example 4: Backport Fix to 8.x

User: "backport PR #12345 to 8.x"

Agent Actions:

# 1. Fetch target branch
git fetch origin 8.x

# 2. Create backport branch
git checkout -b backport-12345-to-8.x origin/8.x

# 3. Find commits to cherry-pick
gh pr view 12345 --json commits --jq '.commits[].oid'

# abc123
# def456

# 4. Cherry-pick
git cherry-pick abc123 def456

# 5. Resolve conflicts (if any)
# (follow conflict resolution steps)

# 6. Push and create PR
git push origin backport-12345-to-8.x
gh pr create \
  --base 8.x \
  --head backport-12345-to-8.x \
  --title "[8.x] Fix: security issue (#12345)" \
  --body "Backport of #12345 to 8.x"

# 7. Validate CI
# Wait for CI, fix if red

Output: Backport PR created and validated.

Troubleshooting

Rebase Failed: "Cannot rebase merge commits"

# Problem: Branch has merge commits
git log --oneline --merges origin/main..HEAD

# Solution 1: Recreate branch from main
git checkout main
git pull origin main
git checkout -b my-branch-clean
git cherry-pick <commit1> <commit2> <commit3>

# Solution 2: Use rebase -p (preserve merges)
git rebase -p origin/main

Cherry-Pick Failed: "Empty commit"

# Problem: Commit already applied (same changes)
git cherry-pick --skip

# Or abort and manually check
git cherry-pick --abort
git diff origin/main..HEAD

Conflicts After Every Commit During Rebase

# Problem: Base branch diverged significantly
# Solution: Abort and recreate branch

git rebase --abort
git checkout main
git pull origin main
git checkout -b my-branch-fresh
git cherry-pick <commits>  # Select only necessary commits

Force Push Rejected

# Problem: Remote branch changed
git push --force-with-lease origin my-branch
# To origin/my-branch
#  ! [rejected]  my-branch -> my-branch (stale info)

# Solution: Fetch and rebase
git fetch origin
git rebase origin/my-branch
git push --force-with-lease origin my-branch

Lost Work After Reset

# Problem: Did 'git reset --hard' by mistake
# Solution: Use reflog to recover

git reflog -30
# Find commit before reset
git reset --hard <commit-before-reset>

Best Practices

Rebase

• ✅ Rebase personal branches before merging
• ✅ Squash fixup commits (lint, type errors)
• ✅ Keep logical commit grouping
• ✅ Backup branch before rebase
• ❌ Don't rebase shared branches (main, 8.x)
• ❌ Don't rebase if branch has merge commits

Cherry-Pick

• ✅ Cherry-pick for backports
• ✅ Cherry-pick for selective fixes
• ✅ Use --edit to update commit message
• ❌ Don't cherry-pick large ranges (use merge)
• ❌ Don't cherry-pick merge commits (use -m)

Conflict Resolution

• ✅ Understand context before resolving
• ✅ Test after resolution (type + lint + test)
• ✅ Ask for help if semantic conflict
• ❌ Don't blindly accept one side
• ❌ Don't leave conflict markers

Force Push

• ✅ Use --force-with-lease (never --force)
• ✅ Only force push personal branches
• ✅ Warn collaborators before force push
• ❌ Never force push main/8.x
• ❌ Don't force push without backup

Notes

• Git is forgiving (reflog saves everything for 90 days)
• When in doubt, create backup branch first
• Force push with --force-with-lease, never --force
• Kibana bot handles backports automatically (label PR)
• Complex rebases: consider recreating branch instead