mirror of https://github.com/knative/pkg.git
65 lines
1.8 KiB
Go
65 lines
1.8 KiB
Go
/*
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Copyright 2018 The Knative 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 changeset
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import (
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"fmt"
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"io/ioutil"
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"os"
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"path/filepath"
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"regexp"
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"strings"
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)
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const (
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commitIDFile = "HEAD"
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koDataPathEnvName = "KO_DATA_PATH"
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)
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var (
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commitIDRE = regexp.MustCompile(`^[a-f0-9]{40}$`)
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)
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// Get tries to fetch the first 7 digitals of GitHub commit ID from HEAD file in
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// KO_DATA_PATH. If it fails, it returns the error it gets.
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func Get() (string, error) {
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data, err := readFileFromKoData(commitIDFile)
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if err != nil {
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return "", err
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}
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commitID := strings.TrimSpace(string(data))
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if !commitIDRE.MatchString(commitID) {
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err := fmt.Errorf("%q is not a valid GitHub commit ID", commitID)
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return "", err
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}
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return string(commitID[0:7]), nil
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}
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// readFileFromKoData tries to read data as string from the file with given name
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// under KO_DATA_PATH then returns the content as string. The file is expected
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// to be wrapped into the container from /kodata by ko. If it fails, returns
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// the error it gets.
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func readFileFromKoData(filename string) ([]byte, error) {
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koDataPath := os.Getenv(koDataPathEnvName)
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if koDataPath == "" {
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err := fmt.Errorf("%q does not exist or is empty", koDataPathEnvName)
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return nil, err
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}
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fullFilename := filepath.Join(koDataPath, filename)
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return ioutil.ReadFile(fullFilename)
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}
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