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// +build norwfs
package dotgit
import (
"fmt"
"gopkg.in/src-d/go-git.v4/plumbing"
)
// There are some filesystems that don't support opening files in RDWD mode.
// In these filesystems the standard SetRef function can not be used as i
// reads the reference file to check that it's not modified before updating it.
//
// This version of the function writes the reference without extra checks
// making it compatible with these simple filesystems. This is usually not
// a problem as they should be accessed by only one process at a time.
func (d *DotGit) setRef(fileName, content string, old *plumbing.Reference) error {
_, err := d.fs.Stat(fileName)
if err == nil && old != nil {
fRead, err := d.fs.Open(fileName)
if err != nil {
return err
}
ref, err := d.readReferenceFrom(fRead, old.Name().String())
fRead.Close()
if err != nil {
return err
}
if ref.Hash() != old.Hash() {
return fmt.Errorf("reference has changed concurrently")
}
}
f, err := d.fs.Create(fileName)
if err != nil {
return err
}
defer f.Close()
_, err = f.Write([]byte(content))
return err
}
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