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main.go
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main.go
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package main
import (
"context"
"flag"
"fmt"
"log"
"os"
"os/exec"
"strings"
"syscall"
secretmanager "cloud.google.com/go/secretmanager/apiv1"
"cloud.google.com/go/secretmanager/apiv1/secretmanagerpb"
"github.com/cockroachdb/errors"
"github.com/hashicorp/logutils"
"golang.org/x/sync/errgroup"
"google.golang.org/api/iterator"
)
var (
Version = "dev"
)
func main() {
ctx := context.Background()
if err := run(ctx); err != nil {
log.Fatal(err)
}
}
func run(ctx context.Context) error {
logLevelCandidates := []logutils.LogLevel{"DEBUG", "INFO", "WARN", "ERROR"}
logFilter := &logutils.LevelFilter{
Levels: logLevelCandidates,
MinLevel: logutils.LogLevel("INFO"),
Writer: os.Stderr,
}
logLevel := os.Getenv("GSENV_LOG_LEVEL")
for _, candidate := range logLevelCandidates {
if string(candidate) == logLevel {
log.Println("set log level to", logLevel)
logFilter.MinLevel = candidate
}
}
log.SetOutput(logFilter)
projectID := os.Getenv("GOOGLE_CLOUD_PROJECT")
var (
flagProjectID string
flagFilter string
flagHelp bool
flagVersion bool
)
flag.StringVar(&flagProjectID, "project", "", "Google Cloud project ID (required)")
flag.StringVar(&flagFilter, "filter", "", "Filter lists of secrets (according to the API spec)")
flag.BoolVar(&flagHelp, "help", false, "Show help")
flag.BoolVar(&flagVersion, "version", false, "Show version")
flag.Parse()
if flagHelp {
flag.Usage()
return nil
}
if flagVersion {
fmt.Println("gsenv version", Version)
return nil
}
if flagProjectID != "" {
projectID = flagProjectID
if projectID == "" {
return errors.New("--project is required but empty")
}
}
log.Println("[DEBUG] projectID:", projectID)
// fetch secrets from Google Cloud Secret Manager
client, err := secretmanager.NewClient(ctx)
if err != nil {
return errors.Wrap(err, "failed to create secret manager client")
}
itr := client.ListSecrets(ctx, &secretmanagerpb.ListSecretsRequest{
Parent: "projects/" + projectID,
Filter: flagFilter,
})
eg := &errgroup.Group{}
eg.SetLimit(25)
for {
secret, err := itr.Next()
if err != nil {
if errors.Is(err, iterator.Done) {
break
}
return errors.Wrap(err, "error Next")
}
log.Println("[DEBUG] ListSecretsResponse:", secret)
secretName := secret.Name
eg.Go(func() error {
secretValue, err := client.AccessSecretVersion(ctx, &secretmanagerpb.AccessSecretVersionRequest{
Name: secretName + "/versions/latest",
})
if err != nil {
return errors.Wrap(err, "error AccessSecretVersion")
}
log.Println("[DEBUG] AccessSecretVersionResponse:", secretValue)
if err := os.Setenv(basename(secretName), string(secretValue.GetPayload().GetData())); err != nil {
return errors.Wrap(err, "error os.Setenv")
}
envName := basename(secretName)
if err := os.Setenv(envName, string(secretValue.GetPayload().GetData())); err != nil {
return errors.Wrap(err, "error os.Setenv")
}
log.Println("[INFO] successfully set environment variable:", envName)
return nil
})
}
if err := eg.Wait(); err != nil {
return errors.Wrap(err, "error eg.Wait")
}
execCommand := flag.Args()
log.Println("[DEBUG] executing command:", execCommand)
bin, err := exec.LookPath(execCommand[0])
if err != nil {
return err
}
if err := syscall.Exec(bin, execCommand, os.Environ()); err != nil {
return errors.Wrap(err, "error syscall.Exec")
}
return nil
}
func basename(input string) string {
aux := strings.Split(input, "/")
return aux[len(aux)-1]
}