/
main.go
199 lines (166 loc) · 5.56 KB
/
main.go
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// Copyright 2018 clair authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package main
import (
"flag"
"math/rand"
"os"
"os/exec"
"os/signal"
"runtime/pprof"
"strings"
"syscall"
"time"
log "github.com/sirupsen/logrus"
"github.com/quay/clair/v3"
"github.com/quay/clair/v3/api"
"github.com/quay/clair/v3/database"
"github.com/quay/clair/v3/ext/vulnsrc"
"github.com/quay/clair/v3/pkg/formatter"
"github.com/quay/clair/v3/pkg/stopper"
"github.com/quay/clair/v3/pkg/strutil"
// Register database driver.
_ "github.com/quay/clair/v3/database/pgsql"
// Register extensions.
_ "github.com/quay/clair/v3/ext/featurefmt/apk"
_ "github.com/quay/clair/v3/ext/featurefmt/dpkg"
_ "github.com/quay/clair/v3/ext/featurefmt/rpm"
_ "github.com/quay/clair/v3/ext/featurens/alpinerelease"
_ "github.com/quay/clair/v3/ext/featurens/aptsources"
_ "github.com/quay/clair/v3/ext/featurens/lsbrelease"
_ "github.com/quay/clair/v3/ext/featurens/osrelease"
_ "github.com/quay/clair/v3/ext/featurens/redhatrelease"
_ "github.com/quay/clair/v3/ext/imagefmt/aci"
_ "github.com/quay/clair/v3/ext/imagefmt/docker"
_ "github.com/quay/clair/v3/ext/notification/webhook"
_ "github.com/quay/clair/v3/ext/vulnmdsrc/nvd"
_ "github.com/quay/clair/v3/ext/vulnsrc/alpine"
_ "github.com/quay/clair/v3/ext/vulnsrc/amzn"
_ "github.com/quay/clair/v3/ext/vulnsrc/debian"
_ "github.com/quay/clair/v3/ext/vulnsrc/oracle"
_ "github.com/quay/clair/v3/ext/vulnsrc/rhel"
_ "github.com/quay/clair/v3/ext/vulnsrc/suse"
_ "github.com/quay/clair/v3/ext/vulnsrc/ubuntu"
)
// MaxDBConnectionAttempts is the total number of tries that Clair will use to
// initially connect to a database at start-up.
const MaxDBConnectionAttempts = 20
// BinaryDependencies are the programs that Clair expects to be on the $PATH
// because it creates subprocesses of these programs.
var BinaryDependencies = []string{
"git",
"rpm",
"xz",
}
func waitForSignals(signals ...os.Signal) {
interrupts := make(chan os.Signal, 1)
signal.Notify(interrupts, signals...)
<-interrupts
}
func startCPUProfiling(path string) *os.File {
f, err := os.Create(path)
if err != nil {
log.WithError(err).Fatal("failed to create profile file")
}
err = pprof.StartCPUProfile(f)
if err != nil {
log.WithError(err).Fatal("failed to start CPU profiling")
}
log.Info("started CPU profiling")
return f
}
func stopCPUProfiling(f *os.File) {
pprof.StopCPUProfile()
f.Close()
log.Info("stopped CPU profiling")
}
func configClairVersion(config *Config) {
clair.EnabledUpdaters = strutil.Intersect(config.Updater.EnabledUpdaters, vulnsrc.ListUpdaters())
log.WithFields(log.Fields{
"Detectors": database.SerializeDetectors(clair.EnabledDetectors()),
"Updaters": clair.EnabledUpdaters,
}).Info("enabled Clair extensions")
}
// Boot starts Clair instance with the provided config.
func Boot(config *Config) {
rand.Seed(time.Now().UnixNano())
st := stopper.NewStopper()
// Open database
var db database.Datastore
var dbError error
for attempts := 1; attempts <= MaxDBConnectionAttempts; attempts++ {
db, dbError = database.Open(config.Database)
if dbError == nil {
break
}
log.WithError(dbError).Error("failed to connect to database")
time.Sleep(time.Duration(attempts) * time.Second)
}
if dbError != nil {
log.Fatal(dbError)
}
defer db.Close()
clair.RegisterConfiguredDetectors(db)
// Start notifier
st.Begin()
go clair.RunNotifier(config.Notifier, db, st)
// Start API
go api.Run(config.API, db)
st.Begin()
go api.RunHealth(config.API, db, st)
// Start updater
st.Begin()
go clair.RunUpdater(config.Updater, db, st)
// Wait for interruption and shutdown gracefully.
waitForSignals(syscall.SIGINT, syscall.SIGTERM)
log.Info("Received interruption, gracefully stopping ...")
st.Stop()
}
// Initialize logging system
func configureLogger(flagLogLevel *string) {
logLevel, err := log.ParseLevel(strings.ToUpper(*flagLogLevel))
if err != nil {
log.WithError(err).Error("failed to set logger parser level")
}
log.SetLevel(logLevel)
log.SetOutput(os.Stdout)
log.SetFormatter(&formatter.JSONExtendedFormatter{ShowLn: true})
}
func main() {
// Parse command-line arguments
flag.CommandLine = flag.NewFlagSet(os.Args[0], flag.ExitOnError)
flagConfigPath := flag.String("config", "/etc/clair/config.yaml", "Load configuration from the specified file.")
flagCPUProfilePath := flag.String("cpu-profile", "", "Write a CPU profile to the specified file before exiting.")
flagLogLevel := flag.String("log-level", "info", "Define the logging level.")
flag.Parse()
configureLogger(flagLogLevel)
// Check for dependencies.
for _, bin := range BinaryDependencies {
_, err := exec.LookPath(bin)
if err != nil {
log.WithError(err).WithField("dependency", bin).Fatal("failed to find dependency")
}
}
config, err := LoadConfig(*flagConfigPath)
if err != nil {
log.WithError(err).Fatal("failed to load configuration")
}
// Enable CPU Profiling if specified
if *flagCPUProfilePath != "" {
defer stopCPUProfiling(startCPUProfiling(*flagCPUProfilePath))
}
// configure updater and worker
configClairVersion(config)
Boot(config)
}