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run.go
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run.go
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// Mgmt
// Copyright (C) 2013-2021+ James Shubin and the project contributors
// Written by James Shubin <[email protected]> and the project contributors
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package lib
import (
"fmt"
"log"
"os"
"os/signal"
"sync"
"syscall"
"github.com/purpleidea/mgmt/gapi"
"github.com/purpleidea/mgmt/util"
"github.com/purpleidea/mgmt/util/errwrap"
"github.com/spf13/afero"
"github.com/urfave/cli"
)
// run is the main run target.
func run(c *cli.Context, name string, gapiObj gapi.GAPI) error {
cliContext := c.Lineage()[1] // these are the flags from `run`
if cliContext == nil {
return fmt.Errorf("could not get cli context")
}
obj := &Main{}
obj.Program, obj.Version = safeProgram(c.App.Name), c.App.Version
if val, exists := c.App.Metadata["flags"]; exists {
if flags, ok := val.(Flags); ok {
obj.Flags = flags
}
}
if h := cliContext.String("hostname"); cliContext.IsSet("hostname") && h != "" {
obj.Hostname = &h
}
if s := cliContext.String("prefix"); cliContext.IsSet("prefix") && s != "" {
obj.Prefix = &s
}
obj.TmpPrefix = cliContext.Bool("tmp-prefix")
obj.AllowTmpPrefix = cliContext.Bool("allow-tmp-prefix")
// create a memory backed temporary filesystem for storing runtime data
mmFs := afero.NewMemMapFs()
afs := &afero.Afero{Fs: mmFs} // wrap so that we're implementing ioutil
standaloneFs := &util.Fs{Afero: afs}
obj.DeployFs = standaloneFs
cliInfo := &gapi.CliInfo{
CliContext: c, // don't pass in the parent context
Fs: standaloneFs,
Debug: obj.Flags.Debug,
Logf: func(format string, v ...interface{}) {
log.Printf("cli: "+format, v...)
},
}
deploy, err := gapiObj.Cli(cliInfo)
if err != nil {
return errwrap.Wrapf(err, "cli parse error")
}
obj.Deploy = deploy
if obj.Deploy == nil {
// nobody activated, but we'll still watch the etcd deploy chan,
// and if there is deployed code that's ready to run, we'll run!
log.Printf("main: no frontend selected (no GAPI activated)")
}
obj.NoWatch = cliContext.Bool("no-watch")
obj.NoStreamWatch = cliContext.Bool("no-stream-watch")
obj.NoDeployWatch = cliContext.Bool("no-deploy-watch")
obj.Noop = cliContext.Bool("noop")
obj.Sema = cliContext.Int("sema")
obj.Graphviz = cliContext.String("graphviz")
obj.GraphvizFilter = cliContext.String("graphviz-filter")
obj.ConvergedTimeout = cliContext.Int64("converged-timeout")
obj.ConvergedTimeoutNoExit = cliContext.Bool("converged-timeout-no-exit")
obj.ConvergedStatusFile = cliContext.String("converged-status-file")
obj.MaxRuntime = uint(cliContext.Int("max-runtime"))
obj.Seeds = cliContext.StringSlice("seeds")
obj.ClientURLs = cliContext.StringSlice("client-urls")
obj.ServerURLs = cliContext.StringSlice("server-urls")
obj.AdvertiseClientURLs = cliContext.StringSlice("advertise-client-urls")
obj.AdvertiseServerURLs = cliContext.StringSlice("advertise-server-urls")
obj.IdealClusterSize = cliContext.Int("ideal-cluster-size")
obj.NoServer = cliContext.Bool("no-server")
obj.NoNetwork = cliContext.Bool("no-network")
obj.NoPgp = cliContext.Bool("no-pgp")
if kp := cliContext.String("pgp-key-path"); cliContext.IsSet("pgp-key-path") {
obj.PgpKeyPath = &kp
}
if us := cliContext.String("pgp-identity"); cliContext.IsSet("pgp-identity") {
obj.PgpIdentity = &us
}
obj.Prometheus = cliContext.Bool("prometheus")
obj.PrometheusListen = cliContext.String("prometheus-listen")
if err := obj.Validate(); err != nil {
return err
}
if err := obj.Init(); err != nil {
return err
}
// install the exit signal handler
wg := &sync.WaitGroup{}
defer wg.Wait()
exit := make(chan struct{})
defer close(exit)
wg.Add(1)
go func() {
defer wg.Done()
// must have buffer for max number of signals
signals := make(chan os.Signal, 3+1) // 3 * ^C + 1 * SIGTERM
signal.Notify(signals, os.Interrupt) // catch ^C
//signal.Notify(signals, os.Kill) // catch signals
signal.Notify(signals, syscall.SIGTERM)
var count uint8
for {
select {
case sig := <-signals: // any signal will do
if sig != os.Interrupt {
log.Printf("interrupted by signal")
obj.Interrupt(fmt.Errorf("killed by %v", sig))
return
}
switch count {
case 0:
log.Printf("interrupted by ^C")
obj.Exit(nil)
case 1:
log.Printf("interrupted by ^C (fast pause)")
obj.FastExit(nil)
case 2:
log.Printf("interrupted by ^C (hard interrupt)")
obj.Interrupt(nil)
}
count++
case <-exit:
return
}
}
}()
reterr := obj.Run()
if reterr != nil {
// log the error message returned
if obj.Flags.Debug {
log.Printf("main: %+v", reterr)
}
}
if err := obj.Close(); err != nil {
if obj.Flags.Debug {
log.Printf("main: Close: %+v", err)
}
if reterr == nil {
return err
}
reterr = errwrap.Append(reterr, err)
}
return reterr
}