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package libvirt
import (
"bytes"
"encoding/xml"
"fmt"
"log"
"time"
"github.com/davecgh/go-spew/spew"
libvirt "github.com/dmacvicar/libvirt-go"
)
var diskLetters []rune = []rune("abcdefghijklmnopqrstuvwxyz")
func DiskLetterForIndex(i int) string {
q := i / len(diskLetters)
r := i % len(diskLetters)
letter := diskLetters[r]
if q == 0 {
return fmt.Sprintf("%c", letter)
}
return fmt.Sprintf("%s%c", DiskLetterForIndex(q-1), letter)
}
// wait for success and timeout after 5 minutes.
func WaitForSuccess(errorMessage string, f func() error) error {
start := time.Now()
for {
err := f()
if err == nil {
return nil
}
log.Printf("[DEBUG] %s. Re-trying.\n", err)
time.Sleep(1 * time.Second)
if time.Since(start) > 5*time.Minute {
return fmt.Errorf("%s: %s", errorMessage, err)
}
}
}
// return an indented XML
func xmlMarshallIndented(b interface{}) (string, error) {
buf := new(bytes.Buffer)
enc := xml.NewEncoder(buf)
enc.Indent(" ", " ")
if err := enc.Encode(b); err != nil {
fmt.Errorf("could not marshall this:\n%s", spew.Sdump(b))
}
return buf.String(), nil
}
// Remove the volume identified by `key` from libvirt
func RemoveVolume(virConn *libvirt.VirConnection, key string) error {
volume, err := virConn.LookupStorageVolByKey(key)
if err != nil {
return fmt.Errorf("Can't retrieve volume %s", key)
}
defer volume.Free()
// Refresh the pool of the volume so that libvirt knows it is
// not longer in use.
volPool, err := volume.LookupPoolByVolume()
if err != nil {
return fmt.Errorf("Error retrieving pool for volume: %s", err)
}
defer volPool.Free()
WaitForSuccess("Error refreshing pool for volume", func() error {
return volPool.Refresh(0)
})
// Workaround for redhat#1293804
// https://bugzilla.redhat.com/show_bug.cgi?id=1293804#c12
// Does not solve the problem but it makes it happen less often.
_, err = volume.GetXMLDesc(0)
if err != nil {
return fmt.Errorf("Can't retrieve volume %s XML desc: %s", key, err)
}
err = volume.Delete(0)
if err != nil {
return fmt.Errorf("Can't delete volume %s: %s", key, err)
}
return nil
}
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