mirror of
https://github.com/kubernetes-sigs/kustomize.git
synced 2026-05-18 12:42:19 +00:00
4f429d6b86
This commit changes git/cloner.go from cloning the whole history and then checking out the desired ref to a implementation that only downloads the history for the desired ref. It does so by first initializing an empty repository, setting the source repository as a remote, fetching just the desired ref and then hard resetting the empty local repo to that ref. This reduces the time it takes to build the multibases example as a remote base at ref v2.0.3 from an avg of 8s with the current implementation to an avg of 2s out of 10 runs each, by drastically decreasing the data transferred. The improvement should increase as repositories grow.
113 lines
2.5 KiB
Go
113 lines
2.5 KiB
Go
/*
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Copyright 2018 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package git
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import (
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"bytes"
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"os/exec"
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"github.com/pkg/errors"
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"sigs.k8s.io/kustomize/pkg/fs"
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)
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// Cloner is a function that can clone a git repo.
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type Cloner func(repoSpec *RepoSpec) error
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// ClonerUsingGitExec uses a local git install, as opposed
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// to say, some remote API, to obtain a local clone of
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// a remote repo.
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func ClonerUsingGitExec(repoSpec *RepoSpec) error {
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gitProgram, err := exec.LookPath("git")
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if err != nil {
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return errors.Wrap(err, "no 'git' program on path")
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}
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repoSpec.cloneDir, err = fs.NewTmpConfirmedDir()
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if err != nil {
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return err
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}
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cmd := exec.Command(
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gitProgram,
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"init",
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repoSpec.cloneDir.String())
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var out bytes.Buffer
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cmd.Stdout = &out
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err = cmd.Run()
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if err != nil {
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return errors.Wrapf(
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err,
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"trouble initializing empty git repo in %s",
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repoSpec.cloneDir.String())
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}
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cmd = exec.Command(
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gitProgram,
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"remote",
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"add",
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"origin",
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repoSpec.CloneSpec())
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cmd.Stdout = &out
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cmd.Dir = repoSpec.cloneDir.String()
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err = cmd.Run()
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if err != nil {
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return errors.Wrapf(
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err,
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"trouble adding remote %s",
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repoSpec.CloneSpec())
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}
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if repoSpec.ref == "" {
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return nil
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}
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cmd = exec.Command(
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gitProgram,
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"fetch",
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"--depth=1",
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"origin",
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repoSpec.ref)
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cmd.Stdout = &out
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cmd.Dir = repoSpec.cloneDir.String()
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err = cmd.Run()
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if err != nil {
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return errors.Wrapf(err, "trouble fetching %s", repoSpec.ref)
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}
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cmd = exec.Command(
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gitProgram,
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"reset",
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"--hard",
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"FETCH_HEAD")
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cmd.Stdout = &out
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cmd.Dir = repoSpec.cloneDir.String()
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err = cmd.Run()
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if err != nil {
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return errors.Wrapf(
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err, "trouble hard resetting empty repository to %s", repoSpec.ref)
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}
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return nil
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}
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// DoNothingCloner returns a cloner that only sets
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// cloneDir field in the repoSpec. It's assumed that
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// the cloneDir is associated with some fake filesystem
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// used in a test.
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func DoNothingCloner(dir fs.ConfirmedDir) Cloner {
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return func(rs *RepoSpec) error {
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rs.cloneDir = dir
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return nil
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}
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}
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