70fbedc217
This makes diff archives to be reproducible. The value is expected to be passed from CLI applications via the $SOUCE_DATE_EPOCH env var. See https://reproducible-builds.org/docs/source-date-epoch/ for the $SOURCE_DATE_EPOCH specification. Signed-off-by: Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp>
70 lines
2.0 KiB
Go
70 lines
2.0 KiB
Go
/*
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Copyright The containerd 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 epoch provides SOURCE_DATE_EPOCH utilities.
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package epoch
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import (
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"fmt"
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"os"
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"strconv"
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"time"
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"github.com/sirupsen/logrus"
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)
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// SourceDateEpochEnv is the SOURCE_DATE_EPOCH env var.
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// See https://reproducible-builds.org/docs/source-date-epoch/
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const SourceDateEpochEnv = "SOURCE_DATE_EPOCH"
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// SourceDateEpoch returns the SOURCE_DATE_EPOCH env var as *time.Time.
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// If the env var is not set, SourceDateEpoch returns nil without an error.
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func SourceDateEpoch() (*time.Time, error) {
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v, ok := os.LookupEnv(SourceDateEpochEnv)
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if !ok {
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return nil, nil // not an error
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}
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i64, err := strconv.ParseInt(v, 10, 64)
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if err != nil {
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return nil, fmt.Errorf("invalid %s value %q: %w", SourceDateEpochEnv, v, err)
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}
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unix := time.Unix(i64, 0)
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return &unix, nil
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}
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// SourceDateEpochOrNow returns the SOURCE_DATE_EPOCH time if available,
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// otherwise returns the current time.
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func SourceDateEpochOrNow() time.Time {
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epoch, err := SourceDateEpoch()
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if err != nil {
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logrus.WithError(err).Warnf("Invalid %s", SourceDateEpochEnv)
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}
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if epoch != nil {
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return *epoch
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}
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return time.Now()
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}
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// SetSourceDateEpoch sets the SOURCE_DATE_EPOCH env var.
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func SetSourceDateEpoch(tm time.Time) {
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os.Setenv(SourceDateEpochEnv, fmt.Sprintf("%d", tm.Unix()))
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}
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// UnsetSourceDateEpoch unsets the SOURCE_DATE_EPOCH env var.
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func UnsetSourceDateEpoch() {
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os.Unsetenv(SourceDateEpochEnv)
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}
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