Generate progress messages during launch.

This commit generates approximate progress messages during the
guestfs_launch call.  Currently this code generates:

   0 / 12: launch clock starts
   3 / 12: appliance created
   6 / 12: detected that guest kernel started
   9 / 12: detected that /init script is running
  12 / 12: launch completed successfully

(Note this is not an ABI and may be changed or removed in a future
version).

Progress messages are only generated at all if 5 seconds have elapsed
since the launch, and they are only generated for the ordinary
appliance (not if using attach-method to attach to an existing virtio
serial port).

1 files changed, 18 insertions, 0 deletions

diff --git a/src/proto.c b/src/proto.c
index 7cd1d313..63aea68e 100644
--- a/src/proto.c
+++ b/src/proto.c
@@ -285,6 +285,24 @@ read_log_message_or_eof (guestfs_h *g, int fd, int error_if_eof)
   /* It's an actual log message, send it upwards if anyone is listening. */
   guestfs___call_callbacks_message (g, GUESTFS_EVENT_APPLIANCE, buf, n);
 
+  /* This is a gross hack.  See the comment above
+   * guestfs___launch_send_progress.
+   */
+  if (g->state == LAUNCHING) {
+    const char *sentinel;
+    size_t len;
+
+    sentinel = "Linux version"; /* kernel up */
+    len = strlen (sentinel);
+    if (memmem (buf, n, sentinel, len) != NULL)
+      guestfs___launch_send_progress (g, 6);
+
+    sentinel = "Starting /init script"; /* /init running */
+    len = strlen (sentinel);
+    if (memmem (buf, n, sentinel, len) != NULL)
+      guestfs___launch_send_progress (g, 9);
+  }
+
   return 0;
 }