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Fetch base and search merge-base without creating local branch

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This commit is contained in:
Michal Dorner 2021-03-09 21:13:57 +01:00
parent 0aa1597c2b
commit 0c0d1a854a
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GPG key ID: 9EEE04B48DA36786
3 changed files with 23 additions and 24 deletions
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22
src/git.ts
View file

@ -54,33 +54,31 @@ export async function getChangesOnHead(): Promise<File[]> {
return parseGitDiffOutput(output)
}
export async function getChangesSinceMergeBase(
baseRef: string,
ref: string,
initialFetchDepth: number
): Promise<File[]> {
export async function getChangesSinceMergeBase(base: string, initialFetchDepth: number): Promise<File[]> {
const baseRef = `remotes/origin/${base}`
async function hasMergeBase(): Promise<boolean> {
return (await exec('git', ['merge-base', baseRef, ref], {ignoreReturnCode: true})).code === 0
return (await exec('git', ['merge-base', baseRef, HEAD], {ignoreReturnCode: true})).code === 0
}
let noMergeBase = false
core.startGroup(`Searching for merge-base ${baseRef}...${ref}`)
core.startGroup(`Searching for merge-base ${baseRef}...${HEAD}`)
try {
let init = true
let lastCommitCount = await getCommitCount()
let depth = Math.max(lastCommitCount * 2, initialFetchDepth)
while (!(await hasMergeBase())) {
if (init) {
await exec('git', ['fetch', `--depth=${depth}`, 'origin', `${baseRef}:${baseRef}`, `${ref}`])
await exec('git', ['fetch', `--depth=${depth}`, 'origin', base, HEAD])
init = false
} else {
await exec('git', ['fetch', `--deepen=${depth}`, 'origin', baseRef, ref])
await exec('git', ['fetch', `--deepen=${depth}`, 'origin', base, HEAD])
}
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', '--unshallow'])
await exec('git', ['fetch'])
if (!(await hasMergeBase())) {
noMergeBase = true
}
@ -99,11 +97,11 @@ export async function getChangesSinceMergeBase(
}
// Get changes introduced on HEAD compared to ref
core.startGroup(`Change detection ${baseRef}...${ref}`)
core.startGroup(`Change detection ${baseRef}...${HEAD}`)
let output = ''
try {
// Three dots '...' change detection - finds merge-base and compares against it
output = (await exec('git', ['diff', '--no-renames', '--name-status', '-z', `${baseRef}...${ref}`])).stdout
output = (await exec('git', ['diff', '--no-renames', '--name-status', '-z', `${baseRef}...${HEAD}`])).stdout
} finally {
fixStdOutNullTermination()
core.endGroup()

4
src/main.ts
View file

@ -109,7 +109,7 @@ async function getChangedFilesFromGit(base: string, initialFetchDepth: number):
if (baseSha === git.NULL_SHA) {
if (defaultRef && baseRef !== defaultRef) {
core.info(`First push of a branch detected - changes will be detected against the default branch ${defaultRef}`)
return await git.getChangesSinceMergeBase(defaultRef, ref, initialFetchDepth)
return await git.getChangesSinceMergeBase(defaultRef, initialFetchDepth)
} else {
core.info('Initial push detected - all files will be listed as added')
return await git.listAllFilesAsAdded()
@ -122,7 +122,7 @@ async function getChangedFilesFromGit(base: string, initialFetchDepth: number):
// Changes introduced by current branch against the base branch
core.info(`Changes will be detected against the branch ${baseRef}`)
return await git.getChangesSinceMergeBase(baseRef, ref, initialFetchDepth)
return await git.getChangesSinceMergeBase(baseRef, initialFetchDepth)
}
// Uses github REST api to get list of files changed in PR