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petersindex
7ac9f4d2f1
A fork's upstream remote can default to a different branch than origin. Read refs/remotes/<remote>/HEAD for the tracked remote and fall back to origin's default only when git never recorded it. Reuses the default-branch resolver's host routing and cache.
63 lines
2.3 KiB
TypeScript
63 lines
2.3 KiB
TypeScript
import { iterateProcessOutputLines } from './process-output-field-scanner'
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export const DEFAULT_BASE_REF_PROBES: readonly { ref: string; returnAs: string }[] = [
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{ ref: 'refs/remotes/origin/main', returnAs: 'origin/main' },
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{ ref: 'refs/remotes/origin/master', returnAs: 'origin/master' },
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{ ref: 'refs/heads/main', returnAs: 'main' },
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{ ref: 'refs/heads/master', returnAs: 'master' }
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]
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export type GitExec = (argv: string[]) => Promise<{ stdout: string }>
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/** Resolve the same default-base ordering through a host-owned Git executor. */
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export async function resolveDefaultBaseRefViaExec(exec: GitExec): Promise<string | null> {
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const originHeadRef = 'refs/remotes/origin/HEAD'
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const refs = [originHeadRef, ...DEFAULT_BASE_REF_PROBES.map(({ ref }) => ref)]
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// A character class forces exact matching instead of including descendants such as main/topic.
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const patterns = refs.map((ref) => `${ref.slice(0, -1)}[${ref.slice(-1)}]`)
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try {
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const { stdout } = await exec(['for-each-ref', '--format=%(refname)%00%(symref)', ...patterns])
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const presentRefs = new Set<string>()
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for (const line of iterateProcessOutputLines(stdout)) {
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const separator = line.indexOf('\0')
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if (separator === -1) {
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continue
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}
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const ref = line.slice(0, separator)
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const target = line.slice(separator + 1)
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if (ref === originHeadRef && target) {
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return target.replace(/^refs\/remotes\//, '')
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}
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presentRefs.add(ref)
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}
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return DEFAULT_BASE_REF_PROBES.find(({ ref }) => presentRefs.has(ref))?.returnAs ?? null
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} catch {
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return null
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}
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}
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/** Branch a remote's `refs/remotes/<remote>/HEAD` points at, or null when git never recorded it. */
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export async function resolveRemoteHeadBranchViaExec(
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exec: GitExec,
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remoteName: string
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): Promise<string | null> {
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const headRef = `refs/remotes/${remoteName}/HEAD`
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const branchPrefix = `refs/remotes/${remoteName}/`
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try {
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const { stdout } = await exec([
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'for-each-ref',
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'--format=%(refname)%00%(symref)',
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`${headRef.slice(0, -1)}[${headRef.slice(-1)}]`
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])
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for (const line of iterateProcessOutputLines(stdout)) {
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const [ref, target] = line.split('\0')
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if (ref === headRef && target?.startsWith(branchPrefix)) {
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return target.slice(branchPrefix.length)
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}
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}
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return null
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} catch {
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return null
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}
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}
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