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tag.go
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tag.go
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package tagger
import (
"errors"
"log"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/aws/ec2metadata"
"github.com/aws/aws-sdk-go/service/ec2"
)
var sess *session.Session
func init() {
var err error
metaSession, _ := session.NewSession()
metaClient := ec2metadata.New(metaSession)
region, _ := metaClient.Region()
sess, err = session.NewSession(&aws.Config{
Region: ®ion,
})
if err != nil {
log.Fatalf("%v", err)
}
}
// Tag syncs ebs volume tags
func Tag(volumeID string, labels map[string]string) (bool, error) {
svc := ec2.New(sess)
input := &ec2.DescribeVolumesInput{
VolumeIds: []*string{&volumeID},
}
result, err := svc.DescribeVolumes(input)
if err != nil {
return false, err
}
if len(result.Volumes) != 1 {
return false, errors.New("expected query to only return a single volume")
}
noChange := true
for key, val := range labels {
isMissing := true
for _, tag := range result.Volumes[0].Tags {
if *tag.Key != key {
continue
}
if val != *tag.Value {
noChange = false
}
isMissing = false
break
}
if isMissing || !noChange {
noChange = false
break
}
}
if noChange {
return false, nil
}
tagInput := &ec2.CreateTagsInput{
Resources: []*string{
aws.String(volumeID),
},
}
tags := []*ec2.Tag{}
for key, val := range labels {
tag := ec2.Tag{
Key: aws.String(key),
Value: aws.String(val),
}
tags = append(tags, &tag)
}
tagInput.Tags = tags
_, err = svc.CreateTags(tagInput)
if err != nil {
return false, err
}
return true, nil
}