| 1 | //go:build linux |
| 2 | |
| 3 | package activator |
| 4 | |
| 5 | import ( |
| 6 | "context" |
| 7 | "crypto/sha256" |
| 8 | "encoding/hex" |
| 9 | "os" |
| 10 | "os/exec" |
| 11 | "path" |
| 12 | |
| 13 | "github.com/carlosframework/platform/internal/cgroup" |
| 14 | "github.com/carlosframework/platform/internal/hostbox" |
| 15 | "github.com/carlosframework/platform/internal/hostclaim" |
| 16 | "github.com/carlosframework/platform/internal/hostwrite" |
| 17 | "golang.org/x/sys/unix" |
| 18 | ) |
| 19 | |
| 20 | // prepareRoleReservation preserves the recoverable reservation primitive for |
| 21 | // the future root integration. It grants no execution capability and Start |
| 22 | // never calls it while the isolated root protocol is unavailable. |
| 23 | func (l RoleLaunch) prepareRoleReservation(ctx context.Context, role string, attempt hostclaim.WakeRetryAttempt, build func() *exec.Cmd) (*exec.Cmd, *cgroup.Prepared, hostbox.LaunchReservation, error) { |
| 24 | if l.Journal.Remote() || l.Parent == nil || l.ParentPath == "" || l.Work == nil || l.Journal == nil || l.Executable == nil || build == nil || attempt.ID == "" || attempt.InvocationID == "" || attempt.LaunchInputs == "" || attempt.Session != l.Target.Session || attempt.Box != l.Target.Box || attempt.Enrollment != l.Target.Enrollment || attempt.BootID != l.Target.BootID || attempt.ControllerID != l.Target.ControllerID { |
| 25 | return nil, nil, hostbox.LaunchReservation{}, hostwrite.ErrUnavailable |
| 26 | } |
| 27 | var cmd *exec.Cmd |
| 28 | var executable *os.File |
| 29 | defer func() { |
| 30 | if executable != nil { |
| 31 | executable.Close() |
| 32 | } |
| 33 | }() |
| 34 | var child *cgroup.Prepared |
| 35 | var reservation hostbox.LaunchReservation |
| 36 | err := l.Work.With(ctx, l.Identity, func() error { |
| 37 | if l.Initialize != nil { |
| 38 | if err := l.Initialize(ctx); err != nil { |
| 39 | return err |
| 40 | } |
| 41 | } |
| 42 | var err error |
| 43 | cmd = build() |
| 44 | if cmd == nil { |
| 45 | return hostwrite.ErrUnavailable |
| 46 | } |
| 47 | executable, err = l.Executable(ctx, cmd) |
| 48 | if err != nil { |
| 49 | return err |
| 50 | } |
| 51 | if executable == nil { |
| 52 | return hostwrite.ErrUnavailable |
| 53 | } |
| 54 | var stat unix.Stat_t |
| 55 | if err = unix.Fstat(int(executable.Fd()), &stat); err != nil { |
| 56 | return err |
| 57 | } |
| 58 | if stat.Mode&unix.S_IFMT != unix.S_IFREG || stat.Mode&0111 == 0 { |
| 59 | return hostwrite.ErrUnavailable |
| 60 | } |
| 61 | digest := sha256.Sum256([]byte(role + "\x00" + attempt.ID)) |
| 62 | name := hex.EncodeToString(digest[:16]) |
| 63 | reservation = hostbox.LaunchReservation{ID: attempt.ID + ":" + role, Role: role, InvocationID: attempt.InvocationID, Inputs: attempt.LaunchInputs, Target: l.Target, Group: hostbox.LaunchGroup{RelativePath: path.Join(l.ParentPath, "role-"+name), InvocationID: attempt.InvocationID}, Executable: hostbox.LaunchFile{Device: uint64(stat.Dev), Inode: stat.Ino}} |
| 64 | child, err = l.Parent.PrepareRoleChildWithIntent(name, func(parent cgroup.ContainmentIdentity) error { |
| 65 | reservation.Parent = hostbox.LaunchGroup{RelativePath: l.ParentPath, Device: parent.Device, Inode: parent.Inode} |
| 66 | return l.Journal.IntendRole(ctx, reservation) |
| 67 | }) |
| 68 | if err != nil { |
| 69 | return err |
| 70 | } |
| 71 | id, err := child.Identity() |
| 72 | if err != nil { |
| 73 | return err |
| 74 | } |
| 75 | reservation.Group.Device, reservation.Group.Inode = id.Device, id.Inode |
| 76 | if err = l.Journal.Reserve(ctx, reservation); err != nil { |
| 77 | return err |
| 78 | } |
| 79 | return nil |
| 80 | }) |
| 81 | return cmd, child, reservation, err |
| 82 | } |
| 83 | |
amadan