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journal.go
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journal.go
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package journal
import (
"archive/tar"
"bufio"
"bytes"
"fmt"
"log"
"os/exec"
"regexp"
"github.com/coreos/go-systemd/dbus"
"github.com/coreos/mayday/mayday/tarable"
)
type SystemdJournal struct {
name string
link string // currently never set to anything
content *bytes.Buffer // the contents of the log, populated by Run()
}
type dbusStatus struct {
unit dbus.UnitStatus
property *dbus.Property
}
var getJournals = func() ([]dbusStatus, error) {
// return list of dbus Unit Statuses for use in ListJournals
var units []dbus.UnitStatus
var statuses []dbusStatus
c, err := dbus.New()
if err != nil {
return statuses, err
}
defer c.Close()
units, err = c.ListUnits()
if err != nil {
return statuses, err
}
for _, u := range units {
if p, err := c.GetUnitProperty(u.Name, "FragmentPath"); err == nil {
statuses = append(statuses, dbusStatus{unit: u, property: p})
}
}
return statuses, nil
}
func List() ([]*SystemdJournal, error) {
var svcs []*SystemdJournal
statuses, err := getJournals()
if err != nil {
return svcs, err
}
pathre := regexp.MustCompile(`/usr/lib(32|64)?/systemd/system/.*\.service`)
// build a list of units that live in /usr/lib/system/system
for _, s := range statuses {
path := s.property.Value.Value().(string)
if pathre.MatchString(path) {
svc := SystemdJournal{name: s.unit.Name}
svcs = append(svcs, &svc)
}
}
return svcs, nil
}
func (j *SystemdJournal) Content() *bytes.Buffer {
if j.content == nil {
j.Run()
}
return j.content
}
func (j *SystemdJournal) Name() string {
return "/journals/" + j.name + ".log"
}
func (j *SystemdJournal) Header() *tar.Header {
return tarable.Header(j.Content(), j.Name())
}
func (j *SystemdJournal) Link() string {
return j.link
}
func (j *SystemdJournal) Run() error {
var b bytes.Buffer
j.content = &b
writer := bufio.NewWriter(j.content)
daysago := 7
log.Printf("collecting %d days of logs from %q", daysago, j.name)
cmd := exec.Command("journalctl", "--since", fmt.Sprintf("-%dd", daysago), "-l", "--utc", "--no-pager", "-u", j.name)
cmd.Stdout = writer
err := cmd.Run()
if err != nil {
log.Printf("failed to dump log for %s: %s", j.Name, err)
}
return err
}