incusd/instance: implmented common.startedAt and called in lcx/qemu r…

…ender state

Signed-off-by: Sahaj Bhakta <sahajbhakta@gmail.com>

internal/server/instance/drivers/driver_common.go

@@ -12,6 +12,8 @@ import (
 	"strings"
 	"sync"
 	"time"
+	"os"
+	"syscall"
 
 	"github.com/google/uuid"
 
@@ -1521,3 +1523,14 @@ func (d *common) setNUMANode() error {
 
 	return d.VolatileSet(map[string]string{"volatile.cpu.nodes": fmt.Sprintf("%d", node)})
 }
+
+// Gets the time the instance was started at
+func (d *common) StartedAt(pid int) (time.Time, error) {
+	file, err := os.Stat(fmt.Sprintf("/proc/%d", pid))
+	if err != nil {
+		return time.Time{}, err
+	}
+
+	linuxInfo := file.Sys().(*syscall.Stat_t)
+	return time.Unix(linuxInfo.Ctim.Sec, linuxInfo.Ctim.Nsec), nil
+}

internal/server/instance/drivers/driver_lxc.go

@@ -35,7 +35,7 @@ import (
 	"golang.org/x/sys/unix"
 	"google.golang.org/protobuf/proto"
 	yaml "gopkg.in/yaml.v2"
-
+	
 	internalInstance "github.com/lxc/incus/v6/internal/instance"
 	"github.com/lxc/incus/v6/internal/instancewriter"
 	internalIO "github.com/lxc/incus/v6/internal/io"
@@ -3411,6 +3411,7 @@ func (d *lxc) renderState(statusCode api.StatusCode, hostInterfaces []net.Interf
 		status.Network = d.networkState(hostInterfaces)
 		status.Pid = int64(pid)
 		status.Processes = processesState
+		status.StartedAt, _ = d.StartedAt(d.InitPID())
 	}
 
 	status.Disk = d.diskState()

internal/server/instance/drivers/driver_qemu.go

@@ -7759,6 +7759,11 @@ func (d *qemu) renderState(statusCode api.StatusCode) (*api.InstanceState, error
 		d.logger.Warn("Error getting disk usage", logger.Ctx{"err": err})
 	}
 
+	status.StartedAt, err = d.StartedAt(d.InitPID())
+	if err != nil {
+		return status, err
+	}
+
 	return status, nil
 }