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Safer file io for configuration files

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Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>
This commit is contained in:
Tonis Tiigi 2016-04-20 17:08:47 -07:00
parent 6f67c13d20
commit ea3cbd3274
7 changed files with 119 additions and 38 deletions
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8
distribution/metadata/metadata.go
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@ -5,6 +5,8 @@ import (
"os"
"path/filepath"
"sync"
"github.com/docker/docker/pkg/ioutils"
)
// Store implements a K/V store for mapping distribution-related IDs
@ -56,14 +58,10 @@ func (store *FSMetadataStore) Set(namespace, key string, value []byte) error {
defer store.Unlock()
path := store.path(namespace, key)
tempFilePath := path + ".tmp"
if err := os.MkdirAll(filepath.Dir(path), 0755); err != nil {
return err
}
if err := ioutil.WriteFile(tempFilePath, value, 0644); err != nil {
return err
}
return os.Rename(tempFilePath, path)
return ioutils.AtomicWriteFile(path, value, 0644)
}
// Delete removes data indexed by namespace and key. The data file named after