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trigger.go
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trigger.go
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package triggers
import (
"fmt"
"os"
"os/exec"
"os/user"
"strconv"
"strings"
"syscall"
"github.com/juan-leon/fetter/pkg/log"
"github.com/juan-leon/fetter/pkg/settings"
)
// TriggerRunner instances can run processes based on configured rules
type TriggerRunner struct {
triggers map[string]settings.Trigger
}
// NewTriggerRunner creates and initializes a TriggerRunner
func NewTriggerRunner(config *settings.Settings) *TriggerRunner {
return &TriggerRunner{
triggers: config.Triggers,
}
}
// Run runs the trigger (if any configured for that name) with environment
// variables defined in data.
func (tr *TriggerRunner) Run(name string, data *map[string]string) error {
if trigger, ok := tr.triggers[name]; ok {
go func() { run(&trigger, name, data) }()
return nil
}
return fmt.Errorf("could not find trigger named: %s", name)
}
func run(trigger *settings.Trigger, name string, data *map[string]string) error {
cmd := exec.Command(trigger.Run, trigger.Args...)
user, err := getUser(trigger.User)
if err != nil {
log.Logger.Errorf("Could not find user for trigger %s: %s", name, err)
return err
}
if sysProcAttr, err := getSysProcAttr(user); err == nil {
if os.Geteuid() == 0 {
cmd.SysProcAttr = sysProcAttr
}
}
cmd.Env = getEnv(user, data)
log.Logger.Infof("Running %s for trigger '%s'", trigger.Run, name)
out, err := cmd.CombinedOutput()
if err != nil {
s := string(out)
if len(s) > 128 {
s = s[:128]
}
log.Logger.Errorw("Trigger execution failed", "name", name, "error", err, "out", s)
return err
}
log.Logger.Infof("Trigger '%s' ended with no error", trigger.Run)
return nil
}
func getSysProcAttr(user *user.User) (*syscall.SysProcAttr, error) {
sysProcAttr := &syscall.SysProcAttr{}
uid, err := strconv.Atoi(user.Uid)
if err != nil {
log.Logger.Errorf("Could not find uid for user '%s': %s", user.Username, err)
return sysProcAttr, err
}
sysProcAttr.Credential = &syscall.Credential{Uid: uint32(uid)}
return sysProcAttr, nil
}
func getUser(userName string) (*user.User, error) {
if userName == "" {
userName = "nobody"
}
return user.Lookup(userName)
}
func getEnv(user *user.User, data *map[string]string) []string {
result := os.Environ()
result = append(result, fmt.Sprintf("HOME=%s", user.HomeDir))
if data != nil {
for k, v := range *data {
result = append(result, fmt.Sprintf("FETTER_%s=%s", strings.ToUpper(k), v))
}
}
return result
}