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// +build !norwfs
package dotgit
import (
"os"
"gopkg.in/src-d/go-git.v4/plumbing"
"gopkg.in/src-d/go-git.v4/utils/ioutil"
)
func (d *DotGit) setRef(fileName, content string, old *plumbing.Reference) (err error) {
// If we are not checking an old ref, just truncate the file.
mode := os.O_RDWR | os.O_CREATE
if old == nil {
mode |= os.O_TRUNC
}
f, err := d.fs.OpenFile(fileName, mode, 0666)
if err != nil {
return err
}
defer ioutil.CheckClose(f, &err)
// Lock is unlocked by the deferred Close above. This is because Unlock
// does not imply a fsync and thus there would be a race between
// Unlock+Close and other concurrent writers. Adding Sync to go-billy
// could work, but this is better (and avoids superfluous syncs).
err = f.Lock()
if err != nil {
return err
}
// this is a no-op to call even when old is nil.
err = d.checkReferenceAndTruncate(f, old)
if err != nil {
return err
}
_, err = f.Write([]byte(content))
return err
}
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