github.com/misfo/deis@v1.0.1-0.20141111224634-e0eee0392b8a/deisctl/backend/fleet/journal.go (about)

     1  package fleet
     2  
     3  import (
     4  	"fmt"
     5  	"os"
     6  )
     7  
     8  // Journal prints the systemd journal of target unit(s)
     9  func (c *FleetClient) Journal(target string) (err error) {
    10  	units, err := c.Units(target)
    11  	if err != nil {
    12  		return
    13  	}
    14  	for _, unit := range units {
    15  		runJournal(unit)
    16  	}
    17  	return
    18  }
    19  
    20  // runJournal tails the systemd journal for a given unit
    21  func runJournal(name string) (exit int) {
    22  
    23  	u, err := cAPI.Unit(name)
    24  	if err != nil {
    25  		fmt.Fprintf(os.Stderr, "Error retrieving Unit %s: %v", name, err)
    26  		return 1
    27  	}
    28  	if u == nil {
    29  		fmt.Fprintf(os.Stderr, "Unit %s does not exist.\n", name)
    30  		return 1
    31  	} else if u.CurrentState == "" {
    32  		fmt.Fprintf(os.Stderr, "Unit %s does not appear to be running.\n", name)
    33  		return 1
    34  	}
    35  
    36  	command := fmt.Sprintf("journalctl --unit %s --no-pager -n 40 -f", name)
    37  	return runCommand(command, u.MachineID)
    38  }