func trimSnapshots(instId string, c *ec2.EC2) {
filter := ec2.NewFilter()
val := fmt.Sprintf("%s/%s", instId, *period)
filter.Add("status", "completed")
filter.Add("tag:inst_snap", val)
resp, err := c.Snapshots(nil, filter)
if err != nil {
log.Printf("Error getting existing snapshots: ", err)
}
if len(resp.Snapshots) > *copies {
excess := len(resp.Snapshots) - *copies
extras := resp.Snapshots[:excess]
log.Printf("Need %d have %d completed snapshots\n", *copies, len(resp.Snapshots))
for _, extra := range extras {
log.Printf("Trimming %s for %sn", extra.Id, instId)
_, err := c.DeleteSnapshots([]string{extra.Id})
if err != nil {
log.Println("Failed trimming snapshot:", extra.Id, " Error: ", err)
}
}
}
}
