# Check current ref storage format
git config core.refStorage

# Migrate to reftables
git refs migrate --ref-storage=reftables

# Verify migration
git fsck --full
git log --oneline -5

# Roll back if needed (before critical operations)
git refs migrate --ref-storage=files

# Clone with sparse-checkout
git clone --filter=blob:none --sparse <repo-url>
cd <repo>

# Initialize sparse-checkout in cone mode
git sparse-checkout init --cone

# Add directories to checkout
git sparse-checkout set src/api src/shared docs

# Add more directories
git sparse-checkout add tests/integration

# View current patterns
git sparse-checkout list

# Check what would be matched
git sparse-checkout check-rules src/api/users.ts

# Disable sparse-checkout
git sparse-checkout disable

# Enable pattern mode
git sparse-checkout init --no-cone

# Add patterns (one per line)
git sparse-checkout set \
  "*.md" \
  "src/api/*" \
  "!src/api/legacy/*"

# Read patterns from file
git sparse-checkout set --stdin < patterns.txt

# After merge/rebase that materialized unwanted files
git sparse-checkout reapply

# Clone without blobs (fetch on demand)
git clone --filter=blob:none <repo-url>

# Clone without large files
git clone --filter=blob:limit=10m <repo-url>

# Combine with sparse-checkout
git clone --filter=blob:none --sparse <repo-url>
cd <repo>
git sparse-checkout set src/api

# Convert existing repository to partial clone
git config extensions.partialClone origin
git config remote.origin.promisor true
git fetch --filter=blob:none

# Prefetch all missing objects
git fetch --unshallow

# Ultimate efficiency: Only objects for specific directories
git clone --filter=blob:none --sparse <repo-url>
cd <repo>
git sparse-checkout set --cone src/api
git checkout main

# Result: Only have objects for src/api

# Verify partial clone status
git config extensions.partialClone

# See promisor packfiles
ls -lah .git/objects/pack/*.promisor

# Force fetch specific object
git rev-list --objects --missing=print HEAD | grep "^?"

# List worktrees
git worktree list

# Create worktree for existing branch
git worktree add ../project-feature feature-branch

# Create worktree with new branch
git worktree add -b new-feature ../project-new-feature

# Create worktree from remote branch
git worktree add ../project-fix origin/fix-bug

# Remove worktree
git worktree remove ../project-feature

# Clean up stale worktree references
git worktree prune

# Worktree for PR review while coding
git worktree add ../myproject-pr-123 origin/pull/123/head
cd ../myproject-pr-123
# Review PR in separate directory
cd -
# Continue coding in main worktree

# Worktree for hotfix
git worktree add --detach ../myproject-hotfix v1.2.3
cd ../myproject-hotfix
# Make hotfix
git switch -c hotfix/security-patch
git commit -am "fix: patch vulnerability"
git push -u origin hotfix/security-patch

# Worktree organization
mkdir -p ~/worktrees/myproject
git worktree add ~/worktrees/myproject/feature-a -b feature-a
git worktree add ~/worktrees/myproject/feature-b -b feature-b
git worktree add ~/worktrees/myproject/pr-review origin/pull/42/head

~/projects/
  myproject/           # Main worktree
  myproject-feature/   # Feature worktree
  myproject-review/    # Review worktree

# Remove merged worktrees
git worktree list | grep feature | while read wt branch commit; do
  if git branch --merged | grep -q "$branch"; then
    git worktree remove "$wt"
  fi
done

# Install scalar (comes with Git 2.47+)
scalar register <path>

# Clone with scalar optimizations
scalar clone --branch main <repo-url>

# Enables automatically:
# - Sparse-checkout (cone mode)
# - Partial clone (blob:none)
# - Multi-pack-index
# - Commit-graph
# - Background maintenance

# Unregister
scalar unregister <path>

# Delete repository
scalar delete <path>

# Fetch missing blobs in background
git backfill

# Configure batch size
git backfill --min-batch-size=1000

# Respect sparse-checkout patterns
git backfill --sparse

git clone large-repo
# Size: 5GB, Time: 10 minutes

git clone --sparse large-repo
git sparse-checkout set src/api
# Size: 500MB, Time: 3 minutes

git clone --filter=blob:none large-repo
# Size: 100MB, Time: 1 minute

git clone --filter=blob:none --sparse large-repo
git sparse-checkout set src/api
# Size: 50MB, Time: 30 seconds

# Verify configuration
git config core.sparseCheckout
git config core.sparseCheckoutCone

# Re-apply patterns
git sparse-checkout reapply

# Check patterns
git sparse-checkout list

# Fetch specific object
git fetch origin <commit>

# Fetch all missing
git fetch --unshallow

# Verify promisor config
git config extensions.partialClone

# Locked worktree
git worktree unlock <path>

# Corrupted worktree
git worktree remove --force <path>
git worktree prune

# Branch already checked out
git checkout --ignore-other-worktrees <branch>

# 1. Current large clone
cd large-project
du -sh .git  # 5GB

# 2. Create optimized new clone
cd ..
git clone --filter=blob:none --sparse large-project-new
cd large-project-new
git sparse-checkout set src/api src/shared

# 3. Verify size
du -sh .git  # 50MB

# 4. Switch workflow
cd ../large-project-new

# 5. Delete old clone when comfortable
rm -rf ../large-project