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pkg/gitutil: init #621
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pkg/gitutil: init #621
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,146 @@ | ||
| // Copyright 2018 clair authors | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| // Package gitutil implements an easy way to update a git repository to a local | ||
| // temporary directory. | ||
| package gitutil | ||
|
|
||
| import ( | ||
| "errors" | ||
| "io/ioutil" | ||
| "os" | ||
| "os/exec" | ||
| "strings" | ||
|
|
||
| log "github.com/sirupsen/logrus" | ||
| ) | ||
|
|
||
| // ErrFailedClone is returned when a git clone is unsuccessful. | ||
| var ErrFailedClone = errors.New("failed to clone git repository") | ||
|
|
||
| // ErrFailedRevParse is returned when a git rev-parse is unsuccessful. | ||
| var ErrFailedRevParse = errors.New("failed to rev-parse git repository") | ||
|
|
||
| // ErrFailedPull is returned when a git pull is unsuccessful. | ||
| var ErrFailedPull = errors.New("failed to pull git repository") | ||
|
|
||
| // pull performs a git pull on the provided path and returns the commit SHA | ||
| // for the HEAD reference. | ||
| func pull(path string) (head string, err error) { | ||
| // Prepare a command to pull the repository. | ||
| cmd := exec.Command("git", "pull") | ||
| cmd.Dir = path | ||
|
|
||
| // Execute the command. | ||
| var commandOutput []byte | ||
| commandOutput, err = cmd.CombinedOutput() | ||
| if err != nil { | ||
| log.WithError(err).WithFields(log.Fields{ | ||
| "path": path, | ||
| "output": string(commandOutput), | ||
| }).Error("failed to git rev-parse repository") | ||
| err = ErrFailedPull | ||
| return | ||
| } | ||
|
|
||
| return revParseHead(path) | ||
| } | ||
|
|
||
| // CloneOrPull performs a git pull if there is a git repository located at | ||
| // repoPath. Otherwise, it performs a git clone to that path. | ||
| // | ||
| // If repoPath is left empty, a temporary directory is generated with the | ||
| // provided prefix and returned. | ||
| func CloneOrPull(remote, repoPath, tempDirPrefix string) (path, head string, err error) { | ||
| // Create a temporary directory if the path is unspecified. | ||
| if repoPath == "" { | ||
| path, err = ioutil.TempDir(os.TempDir(), tempDirPrefix) | ||
| if err != nil { | ||
| return | ||
| } | ||
| } else { | ||
| path = repoPath | ||
| } | ||
|
|
||
| if _, pathExists := os.Stat(path); os.IsNotExist(pathExists) { | ||
| head, err = clone(remote, path) | ||
| return | ||
| } | ||
|
|
||
| head, err = pull(path) | ||
| return | ||
| } | ||
|
|
||
| // clone performs a git clone to the provided path and returns the commit SHA | ||
| // for the HEAD reference. | ||
| func clone(remote, path string) (head string, err error) { | ||
| // Handle an invalid path. | ||
| if path == "" { | ||
| log.WithField("remote", remote).Error("attempted to git clone repository to empty path") | ||
| err = ErrFailedClone | ||
| return | ||
| } | ||
|
|
||
| // Prepare a command to clone the repository. | ||
| cmd := exec.Command("git", "clone", remote, ".") | ||
| cmd.Dir = path | ||
|
|
||
| // Execute the command. | ||
| var commandOutput []byte | ||
| commandOutput, err = cmd.CombinedOutput() | ||
| if err != nil { | ||
| log.WithError(err).WithFields(log.Fields{ | ||
| "remote": remote, | ||
| "path": path, | ||
| "output": string(commandOutput), | ||
| }).Error("failed to git clone repository") | ||
|
|
||
| err = os.RemoveAll(path) | ||
| if err != nil { | ||
| log.WithError(err).WithField("path", path).Warn("failed to remove directory of failed clone") | ||
| } | ||
| err = ErrFailedClone | ||
| return | ||
| } | ||
|
|
||
| return revParseHead(path) | ||
| } | ||
|
|
||
| // revParseHead performs a git rev-parse HEAD on the provided path and returns | ||
| // the commit SHA for the HEAD reference. | ||
| func revParseHead(path string) (head string, err error) { | ||
| // Handle an invalid path. | ||
| if path == "" { | ||
| log.Error("attempted to rev-parse repository with empty path") | ||
| err = ErrFailedRevParse | ||
| return | ||
| } | ||
|
|
||
| cmd := exec.Command("git", "rev-parse", "HEAD") | ||
| cmd.Dir = path | ||
|
|
||
| var commandOutput []byte | ||
| commandOutput, err = cmd.CombinedOutput() | ||
| if err != nil { | ||
| log.WithError(err).WithFields(log.Fields{ | ||
| "path": path, | ||
| "output": string(commandOutput), | ||
| }).Error("failed to git rev-parse repository") | ||
| err = ErrFailedRevParse | ||
| return | ||
| } | ||
|
|
||
| head = strings.TrimSpace(string(commandOutput)) | ||
| return | ||
| } |
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Wow.
Very duplication.
So Git.
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