115 lines
2.4 KiB
Go
115 lines
2.4 KiB
Go
// Copyright (C) 2024 Umorpha Systems
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// SPDX-License-Identifier: AGPL-3.0-or-later
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package gitcache
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import (
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"errors"
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"os"
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"os/exec"
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"path/filepath"
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"sync"
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"time"
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)
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const tsDir = "x-gitcache-ts"
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type Cache struct {
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Dir string
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MinPeriod time.Duration
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initOnce sync.Once
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initErr error
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}
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// "ll" stands for "low level" /////////////////////////////////////////////////
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func (cache *Cache) llInit() error {
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if err := runWithStderr(exec.Command("git", "init", "--bare", cache.Dir)); err != nil {
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return err
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}
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if err := os.Mkdir(filepath.Join(cache.Dir, tsDir), 0o777); err != nil && !errors.Is(err, os.ErrExist) {
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return err
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}
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return nil
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}
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func (cache *Cache) llFetch(namespace, url string) error {
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cmd := exec.Command("git",
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"fetch",
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"--no-write-fetch-head",
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"--no-recurse-submodules",
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"--no-tags",
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"--prune",
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"--",
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url, "*:refs/namespaces/"+namespace+"/*")
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cmd.Dir = cache.Dir
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if err := runWithStderr(cmd); err != nil {
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return err
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}
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return nil
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}
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////////////////////////////////////////////////////////////////////////////////
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func (cache *Cache) init() error {
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cache.initOnce.Do(func() {
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cache.initErr = cache.llInit()
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})
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return cache.initErr
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}
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func (cache *Cache) Fetch(url string) error {
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if err := cache.init(); err != nil {
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return err
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}
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id := url2id(url)
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tsFile := filepath.Join(cache.Dir, tsDir, id)
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if cache.MinPeriod != 0 {
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ts, err := mtime(tsFile)
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if err == nil && ts.Add(cache.MinPeriod).After(time.Now()) {
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return nil
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}
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}
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if err := cache.llFetch(id, url); err != nil {
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return err
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}
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return touch(tsFile)
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}
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func (cache *Cache) RevParse(url, rev string) (string, error) {
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if err := cache.Fetch(url); err != nil {
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return "", err
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}
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cmd := exec.Command("git", "--namespace="+url2id(url), "rev-parse", "--verify", rev)
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cmd.Dir = cache.Dir
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out, err := outputWithStderr(cmd)
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if err != nil {
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return "", err
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}
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return string(out[:len(out)-1]), nil
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}
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func (cache *Cache) Clone(url, dir string, flags ...string) error {
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if err := cache.Fetch(url); err != nil {
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return err
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}
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cacheDir, err := filepath.Abs(cache.Dir)
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if err != nil {
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return err
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}
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cacheURL := "ext::git --namespace " + url2id(url) + " %s " + cacheDir
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cmd := exec.Command("git", append(append([]string{
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"-c", "protocol.ext.allow=user",
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"-c", "url." + cacheURL + ".insteadOf=" + url,
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"clone",
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}, flags...), "--", url, dir)...)
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if err := runWithStderr(cmd); err != nil {
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return err
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}
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return nil
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}
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