mirror/merlin/sync/process.go

149 lines
3.4 KiB
Go

package sync
import (
"fmt"
"os"
"os/exec"
"syscall"
"time"
"git.csclub.uwaterloo.ca/public/merlin/config"
)
// SpawnProcess spawns a child process for the given repo. The process will
// be stopped early if the repo receives a stop signal, or if the process
// runs for longer than the repo's MaxTime.
// It returns a channel through which a Cmd will be sent once it has finished,
// or nil if it was unable to start a process.
func spawnProcess(repo *config.Repo, args []string) (ch <-chan *exec.Cmd) {
repo.Logger.Debug(fmt.Sprintf("Running the command: %v", args))
if repo.DryRun {
repo.Logger.Debug("Dry running for 50 seconds")
args = []string{"sleep", "50"}
}
cmd := exec.Command(args[0], args[1:]...)
repo.Logger.Debug("Starting process")
if err := cmd.Start(); err != nil {
repo.Logger.Error(fmt.Errorf("could not start process for %s: %w", repo.Name, err).Error())
return
}
cmdChan := make(chan *exec.Cmd)
ch = cmdChan
cmdDoneChan := make(chan struct{})
killProcess := func() {
err := cmd.Process.Signal(syscall.SIGTERM)
if err != nil {
repo.Logger.Error("Could not send signal to process:", err)
return
}
select {
case <-time.After(30 * time.Second):
repo.Logger.Warning("Process still hasn't stopped after 30 seconds; sending SIGKILL")
cmd.Process.Signal(syscall.SIGKILL)
case <-cmdDoneChan:
repo.Logger.Debug("Process has been stopped.")
}
}
go func() {
cmd.Wait()
close(cmdDoneChan)
}()
go func() {
defer func() {
cmdChan <- cmd
}()
select {
case <-cmdDoneChan:
if !cmd.ProcessState.Success() {
repo.Logger.Warning("Process ended with status code", cmd.ProcessState.ExitCode())
out, _ := cmd.CombinedOutput()
repo.Logger.Debug(string(out))
}
case <-repo.StopChan:
repo.Logger.Debug("Received signal to stop, killing process...")
killProcess()
case <-time.After(time.Duration(repo.MaxTime) * time.Second):
repo.Logger.Warning("Process has exceeded its max time; killing now")
killProcess()
}
}()
return
}
func startRepoSync(repo *config.Repo) {
status := config.FAILURE
defer func() {
repo.DoneChan <- config.SyncResult{
Name: repo.Name,
Exit: status,
}
}()
if repo.TraceUrl != "" {
repo.Logger.Debug("Checking for changes")
continueSync := true
status, continueSync = checkIfSyncNeeded(repo)
if !continueSync {
return
}
repo.Logger.Debug("Changes found; will attempt to sync")
}
args := getSyncCommand(repo)
if len(args) == 0 {
repo.Logger.Error("zero length command given for sync")
return
}
// clear the rsync log file before starting the sync
if repo.RsyncLogFile != "" {
err := os.Truncate(repo.RsyncLogFile, 0)
if err != nil {
repo.Logger.Error(err.Error())
}
}
ch := spawnProcess(repo, args)
if ch == nil {
// spawnSyncProcess will have already logged error
return
}
cmd := <-ch
switch cmd.ProcessState.ExitCode() {
case 0:
status = config.SUCCESS
case -1:
status = config.TERMINATED
// default is already FAILURE
}
}
func zfsSync(repo *config.Repo) {
// we are not using zfs snapshots at the moment
repo.Logger.Debug("Would run a zfssync if not disabled")
return
out, err := exec.Command("/bin/sh", "/home/mirror/bin/zfssync", repo.Name).CombinedOutput()
if err != nil {
repo.Logger.Error(err)
} else {
f, err := os.OpenFile(repo.ZfssyncLogFile, os.O_WRONLY|os.O_CREATE|os.O_APPEND, 0644)
if err != nil {
repo.Logger.Error(err.Error())
} else {
f.Write(out)
}
}
}