func isFileWriteable(p gopath.GoPath) bool {
if p.IsExists() {
var closer, err = os.OpenFile(p.Path(), os.O_WRONLY, 0)
if closer != nil {
closer.Close()
}
return err == nil
}
return isDirWriteable(p.Dir())
}
// getRelevantFileModeForPath returns the FileMode for the given file or, when
// the file does not exist, its containing directory.
func (a *accessControl) relevantFileModeForPath(p gopath.GoPath) os.FileMode {
if a.hasErr() || p.HasErr() {
return 0
}
var pStat = p.Stat()
if !pStat.IsExists() {
// HINT: Inspect permissions of containing directory
pStat = p.Dir().Stat()
}
a.setErr(pStat.Err())
return pStat.FileMode()
}
// assertPathValidForWriteAccess sets the error flag when the path may not be
// opened for writing by this process.
func (i *pathIO) assertPathValidForWriteAccess(p gopath.GoPath) {
if i.hasErr() {
return
}
if p.HasErr() {
i.setErr(p.Err())
return
}
if p.IsExists() {
if !p.IsRegular() || !isPathWriteable(p) {
i.setErr(store.NewAccessDeniedError(fmt.Sprintf(
"path '%s' with mode %s denotes no regular file or no writeable directory",
p.Path(), p.FileMode())))
}
} else {
var d = p.Dir()
if !isPathWriteable(d) {
i.setErr(store.NewAccessDeniedError(
"parent directory of '" + p.Path() + "' is not writeable"))
}
}
}