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import { execFileSync } from 'node:child_process'
import { cp, mkdir, mkdtemp, readFile, readdir, rm, writeFile } from 'node:fs/promises'
import { tmpdir } from 'node:os'
import { join } from 'node:path'
import { afterAll, afterEach, beforeAll, describe, expect, it } from 'vitest'
import { countLooseRefs } from '../../shared/loose-ref-count'
import { RepoRefMaintenance } from '../../shared/repo-ref-maintenance'
import { PACK_INDEX_MAINTENANCE_COOLDOWN_MS } from '../../shared/repo-pack-index-maintenance-policy'
import {
_resetLocalRepoRefMaintenanceForTests,
createLocalRepoRefMaintenanceTarget,
getLocalRepoRefMaintenance,
setRepoMaintenanceActivityProbe
} from './local-repo-ref-maintenance'
import { forceDeleteLocalBranch } from './worktree-branch-removal'
import { maintainRepoPackIndex, PACK_INDEX_THRESHOLD } from './repo-pack-index-maintenance'
const roots: string[] = []
// Let the capped deferral ladder outlast three real pack-refs runs.
const QUIET_MS = 25
const THRESHOLD = 20
let packFixtureRoot = ''
let packFixtureBlobs: string[] = []
function git(cwd: string, args: string[], input?: string): string {
return execFileSync('git', args, {
cwd,
encoding: 'utf8',
input,
stdio: ['pipe', 'pipe', 'pipe']
}).trim()
}
function hasWriteOption(option: string): boolean {
try {
git(process.cwd(), ['multi-pack-index', 'write', '-h'])
} catch (error) {
if (typeof error === 'object' && error !== null) {
return (
('stderr' in error && String(error.stderr).includes(option)) ||
('stdout' in error && String(error.stdout).includes(option))
)
}
}
return false
}
async function createFragmentedPacks(repoPath: string): Promise<string[]> {
await cp(
join(packFixtureRoot, '.git', 'objects', 'pack'),
join(repoPath, '.git', 'objects', 'pack'),
{
recursive: true
}
)
return packFixtureBlobs
}
beforeAll(async () => {
packFixtureRoot = await mkdtemp(join(tmpdir(), 'orca-fragmented-packs-'))
git(packFixtureRoot, ['init', '--quiet'])
packFixtureBlobs = await buildFragmentedPacks(packFixtureRoot)
})
afterAll(async () => {
await rm(packFixtureRoot, { recursive: true, force: true })
})
async function buildFragmentedPacks(repoPath: string): Promise<string[]> {
const objects = join(repoPath, '.git', 'objects')
const files = Array.from({ length: PACK_INDEX_THRESHOLD }, (_, index) => `packed-${index}`)
await Promise.all(files.map((file) => writeFile(join(repoPath, file), `${file}\n`)))
const blobs = git(repoPath, ['hash-object', '-w', ...files]).split('\n')
for (const blob of blobs) {
git(repoPath, ['pack-objects', join(objects, 'pack', 'pack')], `${blob}\n`)
await rm(join(objects, blob.slice(0, 2), blob.slice(2)))
}
return blobs
}
function maintainIndex(repoPath: string) {
return maintainRepoPackIndex({
repoPath,
commonDir: join(repoPath, '.git'),
signal: new AbortController().signal,
span: { setAttribute: () => {} },
canWrite: () => true
})
}
async function createRepo(looseRefs: number): Promise<{ repoPath: string; refsDir: string }> {
const root = await mkdtemp(join(tmpdir(), 'orca-ref-maintenance-git-'))
roots.push(root)
const repoPath = join(root, 'repo')
execFileSync('git', ['init', '--quiet', repoPath])
git(repoPath, ['symbolic-ref', 'HEAD', 'refs/heads/main'])
git(repoPath, ['config', 'user.email', 'test@example.com'])
git(repoPath, ['config', 'user.name', 'Test User'])
await writeFile(join(repoPath, 'file.txt'), 'one\n')
git(repoPath, ['add', 'file.txt'])
git(repoPath, ['commit', '--quiet', '-m', 'initial'])
const head = git(repoPath, ['rev-parse', 'HEAD'])
// Written directly: `update-ref` for thousands of refs is the slow part of the fixture.
const namespace = join(repoPath, '.git', 'refs', 'remotes', 'origin')
await mkdir(namespace, { recursive: true })
for (let index = 0; index < looseRefs; index += 1) {
await writeFile(join(namespace, `branch-${index}`), `${head}\n`)
}
return { repoPath, refsDir: join(repoPath, '.git', 'refs') }
}
function createMaintenance(
onPackRefs: () => void = () => {},
now?: () => number
): {
maintenance: RepoRefMaintenance
arm: (repoPath: string) => void
} {
const maintenance = new RepoRefMaintenance({
quietPeriodMs: QUIET_MS,
looseRefThreshold: THRESHOLD,
...(now ? { now } : {})
})
return {
maintenance,
arm: (repoPath: string) => {
const target = createLocalRepoRefMaintenanceTarget({
key: `local::${repoPath}`,
repoPath
})
maintenance.arm({
...target,
packRefs: async (signal) => {
onPackRefs()
await target.packRefs(signal)
}
})
}
}
}
async function settle(maintenance: RepoRefMaintenance): Promise<void> {
await new Promise((resolve) => setTimeout(resolve, QUIET_MS * 4))
await maintenance.whenAttemptSettled()
}
/** Deferred repos re-arm for another quiet period, so drain rather than count rounds. */
async function settleUntil(
maintenance: RepoRefMaintenance,
done: () => Promise<boolean>
): Promise<void> {
for (let round = 0; round < 100; round += 1) {
if (await done()) {
return
}
await settle(maintenance)
}
}
afterEach(async () => {
_resetLocalRepoRefMaintenanceForTests()
await Promise.all(roots.splice(0).map((root) => rm(root, { recursive: true, force: true })))
})
describe('idle ref maintenance against real Git', () => {
it('indexes fragmented packs without rewriting objects or requiring loose-ref debt', async () => {
const { repoPath } = await createRepo(0)
git(repoPath, ['config', 'maintenance.auto', 'true'])
git(repoPath, ['config', 'gc.auto', '6700'])
const objects = join(repoPath, '.git', 'objects')
const packs = join(objects, 'pack')
const blobs = await createFragmentedPacks(repoPath)
const originalPacks = (await readdir(packs)).sort()
const lock = join(packs, 'multi-pack-index.lock')
await writeFile(lock, 'another writer')
const blocked = createMaintenance()
blocked.arm(repoPath)
await settle(blocked.maintenance)
blocked.maintenance.dispose()
await expect(readFile(lock, 'utf8')).resolves.toBe('another writer')
await expect(readFile(join(packs, 'multi-pack-index'))).rejects.toMatchObject({
code: 'ENOENT'
})
await rm(lock)
const { maintenance, arm } = createMaintenance()
arm(repoPath)
await settle(maintenance)
maintenance.dispose()
const index = await readFile(join(packs, 'multi-pack-index'))
expect(index.subarray(0, 4).toString()).toBe('MIDX')
expect((await readdir(packs)).filter((name) => name !== 'multi-pack-index').sort()).toEqual(
originalPacks
)
expect(git(repoPath, ['multi-pack-index', 'verify'])).toBe('')
expect(git(repoPath, ['-c', 'core.multiPackIndex=true', 'cat-file', '-p', blobs[0]])).toBe(
'packed-0'
)
expect(
git(repoPath, [
'-c',
'core.multiPackIndex=true',
'cat-file',
'-p',
blobs[PACK_INDEX_THRESHOLD - 1]
])
).toBe(`packed-${PACK_INDEX_THRESHOLD - 1}`)
await expect(readFile(join(repoPath, '.git', 'packed-refs'))).rejects.toMatchObject({
code: 'ENOENT'
})
})
it('refreshes new packs during ref cooldown and keeps readers working between writes', async () => {
const { repoPath } = await createRepo(0)
const blobs = await createFragmentedPacks(repoPath)
const packs = join(repoPath, '.git', 'objects', 'pack')
let clock = 0
const { maintenance, arm } = createMaintenance(
() => {},
() => clock
)
arm(repoPath)
await settle(maintenance)
expect((await readFile(join(packs, 'multi-pack-index'))).readUInt32BE(8)).toBe(
PACK_INDEX_THRESHOLD
)
const added = git(repoPath, ['hash-object', '-w', '--stdin'], 'new fetched object\n')
git(repoPath, ['pack-objects', join(packs, 'pack')], `${added}\n`)
await rm(join(repoPath, '.git', 'objects', added.slice(0, 2), added.slice(2)))
expect(git(repoPath, ['cat-file', '-p', added])).toBe('new fetched object')
expect(git(repoPath, ['cat-file', '-p', blobs[0]])).toBe('packed-0')
clock = PACK_INDEX_MAINTENANCE_COOLDOWN_MS + 1
arm(repoPath)
await settle(maintenance)
maintenance.dispose()
expect((await readFile(join(packs, 'multi-pack-index'))).readUInt32BE(8)).toBe(
PACK_INDEX_THRESHOLD + 1
)
expect(git(repoPath, ['multi-pack-index', 'verify'])).toBe('')
await expect(readFile(join(repoPath, '.git', 'packed-refs'))).rejects.toMatchObject({
code: 'ENOENT'
})
})
it.skipIf(!hasWriteOption('bitmap'))(
'preserves a real MIDX bitmap and its index byte for byte',
async () => {
const { repoPath } = await createRepo(0)
await createFragmentedPacks(repoPath)
const packs = join(repoPath, '.git', 'objects', 'pack')
git(repoPath, ['pack-objects', '--revs', join(packs, 'pack')], 'HEAD\n')
git(repoPath, ['multi-pack-index', 'write', '--bitmap'])
const metadata = (await readdir(packs)).filter((name) => name.startsWith('multi-pack-index'))
expect(metadata.some((name) => name.endsWith('.bitmap'))).toBe(true)
const before = await Promise.all(metadata.map((name) => readFile(join(packs, name))))
await expect(maintainIndex(repoPath)).resolves.toBe('protected')
const after = await Promise.all(metadata.map((name) => readFile(join(packs, name))))
expect(after).toEqual(before)
}
)
it.skipIf(!hasWriteOption('incremental'))(
'preserves a real incremental MIDX chain and its layers',
async () => {
const { repoPath } = await createRepo(0)
await createFragmentedPacks(repoPath)
const chain = join(repoPath, '.git', 'objects', 'pack', 'multi-pack-index.d')
git(repoPath, ['multi-pack-index', 'write', '--incremental'])
const metadata = (await readdir(chain)).sort()
expect(metadata).toContain('multi-pack-index-chain')
const before = await Promise.all(metadata.map((name) => readFile(join(chain, name))))
await expect(maintainIndex(repoPath)).resolves.toBe('protected')
expect((await readdir(chain)).sort()).toEqual(metadata)
expect(await Promise.all(metadata.map((name) => readFile(join(chain, name))))).toEqual(before)
}
)
it('packs a backlogged repository down to zero loose refs', async () => {
const { repoPath, refsDir } = await createRepo(THRESHOLD + 30)
const { maintenance, arm } = createMaintenance()
await expect(countLooseRefs(refsDir, 10_000)).resolves.toMatchObject({
count: THRESHOLD + 31
})
arm(repoPath)
await settle(maintenance)
maintenance.dispose()
await expect(countLooseRefs(refsDir, 10_000)).resolves.toEqual({ count: 0, saturated: false })
expect(git(repoPath, ['for-each-ref', '--format=%(refname)']).split('\n')).toHaveLength(
THRESHOLD + 31
)
expect(git(repoPath, ['rev-parse', '--verify', 'refs/remotes/origin/branch-0'])).toMatch(
/^[0-9a-f]{40}$/
)
}, 30_000)
it('leaves a healthy repository untouched', async () => {
const { repoPath, refsDir } = await createRepo(2)
let packed = 0
const { maintenance, arm } = createMaintenance(() => {
packed += 1
})
arm(repoPath)
await settle(maintenance)
maintenance.dispose()
expect(packed).toBe(0)
await expect(countLooseRefs(refsDir, 10_000)).resolves.toMatchObject({ count: 3 })
}, 30_000)
it('honours maintenance.auto=false in the repository config', async () => {
const { repoPath, refsDir } = await createRepo(THRESHOLD + 30)
git(repoPath, ['config', 'maintenance.auto', 'false'])
let packed = 0
const { maintenance, arm } = createMaintenance(() => {
packed += 1
})
arm(repoPath)
await settle(maintenance)
maintenance.dispose()
expect(packed).toBe(0)
await expect(countLooseRefs(refsDir, 10_000)).resolves.toMatchObject({
count: THRESHOLD + 31
})
}, 30_000)
it('runs one repository at a time even when several go quiet together', async () => {
const repos = await Promise.all([
createRepo(THRESHOLD + 5),
createRepo(THRESHOLD + 5),
createRepo(THRESHOLD + 5)
])
let concurrent = 0
let peak = 0
const maintenance = new RepoRefMaintenance({
quietPeriodMs: QUIET_MS,
looseRefThreshold: THRESHOLD
})
for (const { repoPath } of repos) {
const target = createLocalRepoRefMaintenanceTarget({
key: `local::${repoPath}`,
repoPath
})
maintenance.arm({
...target,
packRefs: async (signal) => {
concurrent += 1
peak = Math.max(peak, concurrent)
try {
await target.packRefs(signal)
} finally {
concurrent -= 1
}
}
})
}
const allPacked = async (): Promise<boolean> => {
const counts = await Promise.all(repos.map(({ refsDir }) => countLooseRefs(refsDir, 10_000)))
return counts.every((scan) => scan.count === 0)
}
await settleUntil(maintenance, allPacked)
maintenance.dispose()
expect(peak).toBe(1)
for (const { refsDir } of repos) {
await expect(countLooseRefs(refsDir, 10_000)).resolves.toEqual({
count: 0,
saturated: false
})
}
}, 60_000)
})
describe('yielding the repository to work that deletes refs', () => {
it('waits for the packed-refs lock and succeeds while the prune continues', async () => {
// Await the packed-refs rewrite window; killing the later prune can strand per-ref locks.
const { repoPath } = await createRepo(0)
git(repoPath, ['branch', 'doomed'])
const head = git(repoPath, ['rev-parse', 'refs/heads/doomed'])
let packing = false
let releaseLock: (() => void) | undefined
_resetLocalRepoRefMaintenanceForTests({ quietPeriodMs: QUIET_MS, looseRefThreshold: 1 })
setRepoMaintenanceActivityProbe(() => false)
getLocalRepoRefMaintenance().arm({
key: `local::${repoPath}`,
resolveRefsDirectory: async () => join(repoPath, '.git', 'refs'),
packRefs: async (lock) => {
packing = true
lock.setHeld(true)
await new Promise<void>((resolve) => {
releaseLock = () => {
lock.setHeld(false)
resolve()
}
})
}
})
for (let attempt = 0; attempt < 200 && !packing; attempt += 1) {
await new Promise((resolve) => setTimeout(resolve, QUIET_MS))
}
expect(packing).toBe(true)
let deleted = false
const deletion = forceDeleteLocalBranch(repoPath, 'doomed', head).then(() => {
deleted = true
})
await new Promise((resolve) => setTimeout(resolve, QUIET_MS * 4))
expect(deleted).toBe(false)
expect(git(repoPath, ['branch', '--list', 'doomed'])).toContain('doomed')
releaseLock?.()
await deletion
expect(deleted).toBe(true)
expect(git(repoPath, ['branch', '--list', 'doomed'])).toBe('')
}, 30_000)
it('does not block the caller once the rewrite window has closed', async () => {
const { repoPath } = await createRepo(0)
git(repoPath, ['branch', 'doomed'])
const head = git(repoPath, ['rev-parse', 'refs/heads/doomed'])
let pruning = false
let finishPrune: (() => void) | undefined
_resetLocalRepoRefMaintenanceForTests({ quietPeriodMs: QUIET_MS, looseRefThreshold: 1 })
setRepoMaintenanceActivityProbe(() => false)
getLocalRepoRefMaintenance().arm({
key: `local::${repoPath}`,
resolveRefsDirectory: async () => join(repoPath, '.git', 'refs'),
packRefs: async (lock) => {
lock.setHeld(true)
lock.setHeld(false)
pruning = true
await new Promise<void>((resolve) => {
finishPrune = resolve
})
}
})
for (let attempt = 0; attempt < 200 && !pruning; attempt += 1) {
await new Promise((resolve) => setTimeout(resolve, QUIET_MS))
}
const startedAt = Date.now()
await expect(forceDeleteLocalBranch(repoPath, 'doomed', head)).resolves.toBeUndefined()
expect(Date.now() - startedAt).toBeLessThan(2_000)
finishPrune?.()
}, 30_000)
})
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