78 lines
1.8 KiB
Go
78 lines
1.8 KiB
Go
/*
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Copyright 2018 Google LLC
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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 util
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import (
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"crypto/md5"
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"encoding/hex"
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"github.com/pkg/errors"
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"github.com/sirupsen/logrus"
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"io"
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"os"
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)
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// SetLogLevel sets the logrus logging level
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func SetLogLevel(logLevel string) error {
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lvl, err := logrus.ParseLevel(logLevel)
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if err != nil {
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return errors.Wrap(err, "parsing log level")
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}
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logrus.SetLevel(lvl)
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return nil
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}
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// Hasher returns a hash function, used in snapshotting to determine if a file has changed
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func Hasher() func(string) (string, error) {
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hasher := func(p string) (string, error) {
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h := md5.New()
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fi, err := os.Lstat(p)
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if err != nil {
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return "", err
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}
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h.Write([]byte(fi.Mode().String()))
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h.Write([]byte(fi.ModTime().String()))
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if fi.Mode().IsRegular() {
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f, err := os.Open(p)
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if err != nil {
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return "", err
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}
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defer f.Close()
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if _, err := io.Copy(h, f); err != nil {
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return "", err
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}
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}
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return hex.EncodeToString(h.Sum(nil)), nil
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}
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return hasher
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}
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// MtimeHasher returns a hash function, which only looks at mtime to determine if a file has changed
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func MtimeHasher() func(string) (string, error) {
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hasher := func(p string) (string, error) {
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h := md5.New()
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fi, err := os.Lstat(p)
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if err != nil {
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return "", err
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}
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h.Write([]byte(fi.ModTime().String()))
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return hex.EncodeToString(h.Sum(nil)), nil
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}
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return hasher
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}
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