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git.ts
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git.ts
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import exec from './exec'
import * as core from '@actions/core'
import {File, ChangeStatus} from './file'
export const NULL_SHA = '0000000000000000000000000000000000000000'
export const HEAD = 'HEAD'
export async function getChangesInLastCommit(): Promise<File[]> {
core.startGroup(`Change detection in last commit`)
let output = ''
try {
output = (await exec('git', ['log', '--format=', '--no-renames', '--name-status', '-z', '-n', '1'])).stdout
} finally {
fixStdOutNullTermination()
core.endGroup()
}
return parseGitDiffOutput(output)
}
export async function getChanges(baseRef: string): Promise<File[]> {
if (!(await hasCommit(baseRef))) {
// Fetch single commit
core.startGroup(`Fetching ${baseRef} from origin`)
await exec('git', ['fetch', '--depth=1', '--no-tags', 'origin', baseRef])
core.endGroup()
}
// Get differences between ref and HEAD
core.startGroup(`Change detection ${baseRef}..HEAD`)
let output = ''
try {
// Two dots '..' change detection - directly compares two versions
output = (await exec('git', ['diff', '--no-renames', '--name-status', '-z', `${baseRef}..HEAD`])).stdout
} finally {
fixStdOutNullTermination()
core.endGroup()
}
return parseGitDiffOutput(output)
}
export async function getChangesOnHead(): Promise<File[]> {
// Get current changes - both staged and unstaged
core.startGroup(`Change detection on HEAD`)
let output = ''
try {
output = (await exec('git', ['diff', '--no-renames', '--name-status', '-z', 'HEAD'])).stdout
} finally {
fixStdOutNullTermination()
core.endGroup()
}
return parseGitDiffOutput(output)
}
export async function getChangesSinceMergeBase(base: string, ref: string, initialFetchDepth: number): Promise<File[]> {
let baseRef: string | undefined
async function hasMergeBase(): Promise<boolean> {
return (
baseRef !== undefined && (await exec('git', ['merge-base', baseRef, ref], {ignoreReturnCode: true})).code === 0
)
}
let noMergeBase = false
core.startGroup(`Searching for merge-base ${base}...${ref}`)
try {
baseRef = await getFullRef(base)
if (!(await hasMergeBase())) {
await exec('git', ['fetch', '--no-tags', `--depth=${initialFetchDepth}`, 'origin', base, ref])
if (baseRef === undefined) {
baseRef = await getFullRef(base)
if (baseRef === undefined) {
await exec('git', ['fetch', '--tags', `--depth=1`, 'origin', base, ref])
baseRef = await getFullRef(base)
if (baseRef === undefined) {
throw new Error(`Could not determine what is ${base} - fetch works but it's not a branch or tag`)
}
}
}
let depth = initialFetchDepth
let lastCommitCount = await getCommitCount()
while (!(await hasMergeBase())) {
depth = Math.min(depth * 2, Number.MAX_SAFE_INTEGER)
await exec('git', ['fetch', `--deepen=${depth}`, 'origin', base, ref])
const commitCount = await getCommitCount()
if (commitCount === lastCommitCount) {
core.info('No more commits were fetched')
core.info('Last attempt will be to fetch full history')
await exec('git', ['fetch'])
if (!(await hasMergeBase())) {
noMergeBase = true
}
break
}
lastCommitCount = commitCount
}
}
} finally {
core.endGroup()
}
let diffArg = `${baseRef}...${ref}`
if (noMergeBase) {
core.warning('No merge base found - change detection will use direct <commit>..<commit> comparison')
diffArg = `${baseRef}..${ref}`
}
// Get changes introduced on ref compared to base
core.startGroup(`Change detection ${diffArg}`)
let output = ''
try {
// Three dots '...' change detection - finds merge-base and compares against it
output = (await exec('git', ['diff', '--no-renames', '--name-status', '-z', diffArg])).stdout
} finally {
fixStdOutNullTermination()
core.endGroup()
}
return parseGitDiffOutput(output)
}
export function parseGitDiffOutput(output: string): File[] {
const tokens = output.split('\u0000').filter(s => s.length > 0)
const files: File[] = []
for (let i = 0; i + 1 < tokens.length; i += 2) {
files.push({
status: statusMap[tokens[i]],
filename: tokens[i + 1]
})
}
return files
}
export async function listAllFilesAsAdded(): Promise<File[]> {
core.startGroup('Listing all files tracked by git')
let output = ''
try {
output = (await exec('git', ['ls-files', '-z'])).stdout
} finally {
fixStdOutNullTermination()
core.endGroup()
}
return output
.split('\u0000')
.filter(s => s.length > 0)
.map(path => ({
status: ChangeStatus.Added,
filename: path
}))
}
export async function getCurrentRef(): Promise<string> {
core.startGroup(`Determining current ref`)
try {
const branch = (await exec('git', ['branch', '--show-current'])).stdout.trim()
if (branch) {
return branch
}
const describe = await exec('git', ['describe', '--tags', '--exact-match'], {ignoreReturnCode: true})
if (describe.code === 0) {
return describe.stdout.trim()
}
return (await exec('git', ['rev-parse', HEAD])).stdout.trim()
} finally {
core.endGroup()
}
}
export function getShortName(ref: string): string {
if (!ref) return ''
const heads = 'refs/heads/'
const tags = 'refs/tags/'
if (ref.startsWith(heads)) return ref.slice(heads.length)
if (ref.startsWith(tags)) return ref.slice(tags.length)
return ref
}
export function isGitSha(ref: string): boolean {
return /^[a-z0-9]{40}$/.test(ref)
}
async function hasCommit(ref: string): Promise<boolean> {
core.startGroup(`Checking if commit for ${ref} is locally available`)
try {
return (await exec('git', ['cat-file', '-e', `${ref}^{commit}`], {ignoreReturnCode: true})).code === 0
} finally {
core.endGroup()
}
}
async function getCommitCount(): Promise<number> {
const output = (await exec('git', ['rev-list', '--count', '--all'])).stdout
const count = parseInt(output)
return isNaN(count) ? 0 : count
}
async function getFullRef(shortName: string): Promise<string | undefined> {
if (isGitSha(shortName)) {
return shortName
}
const output = (await exec('git', ['show-ref', shortName], {ignoreReturnCode: true})).stdout
const refs = output
.split(/\r?\n/g)
.map(l => l.match(/refs\/.*$/)?.[0] ?? '')
.filter(l => l !== '')
if (refs.length === 0) {
return undefined
}
const remoteRef = refs.find(ref => ref.startsWith('refs/remotes/origin/'))
if (remoteRef) {
return remoteRef
}
return refs[0]
}
function fixStdOutNullTermination(): void {
// Previous command uses NULL as delimiters and output is printed to stdout.
// We have to make sure next thing written to stdout will start on new line.
// Otherwise things like ::set-output wouldn't work.
core.info('')
}
const statusMap: {[char: string]: ChangeStatus} = {
A: ChangeStatus.Added,
C: ChangeStatus.Copied,
D: ChangeStatus.Deleted,
M: ChangeStatus.Modified,
R: ChangeStatus.Renamed,
U: ChangeStatus.Unmerged
}