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Ensure link files are created atomically

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This commit is contained in:
rubyist 2014-09-26 12:37:49 -04:00
parent be349c55ba
commit 0491067d46
1 changed files with 15 additions and 2 deletions
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17
pointer/link.go
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@ -7,7 +7,6 @@ import (
"github.com/github/git-media/git"
"github.com/github/git-media/gitmedia"
"io"
"io/ioutil"
"os"
"path/filepath"
"strings"
@ -40,8 +39,22 @@ func (p *Pointer) CreateLink(filename string) error {
if err != nil {
return err
}
linkLock := linkFile + ".lock"
return ioutil.WriteFile(linkFile, []byte(fmt.Sprintf(linkTemplate, p.Oid, filename)), 0644)
file, err := os.OpenFile(linkLock, os.O_RDWR|os.O_CREATE|os.O_EXCL, 0644)
if err != nil {
return err
}
_, err = file.WriteString(fmt.Sprintf(linkTemplate, p.Oid, filename))
if err != nil {
os.Remove(linkLock)
return err
}
file.Close()
return os.Rename(linkLock, linkFile)
}
// FindLink takes a git sha1 and attempts to find the link file associated