[PATCH] activate.py: add diagnostic output for USB probing

[Bernie Innocenti]

This debug output helps finding out why activate.py refuses to
activate a laptop. Without it, one is left wondering whether mount
failed, leases.dat wasn't found or its content was incorrect.
---
 30olpc-boot/activate.py |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/30olpc-boot/activate.py b/30olpc-boot/activate.py
index 72094ea..0d14269 100755
--- a/30olpc-boot/activate.py
+++ b/30olpc-boot/activate.py
@@ -31,8 +31,11 @@ def blk_mounted(device, mnt, fstype=None):
 def try_blk(device, mnt, fstype=None):
     """Try to mount a block device and read keylist from it."""
     try:
+        print >> sys.stderr, "Trying " + device + "...",
         with blk_mounted(device, mnt, fstype):
+            print >> sys.stderr, "mounted...",
             with open(os.path.join(mnt,'lease.sig')) as f:
+                print >> sys.stderr, "lease.sig found."
                 return f.read()
     except:
         return None
@@ -214,6 +217,7 @@ def usb_init():
     global _usb_first
     # ignore modprobe failures, since older kernels don't have
     # modular usb (trac #7113).
+    print >> sys.stderr, "Loading USB modules..."
     call(['/sbin/modprobe','ohci-hcd'])
     call(['/sbin/modprobe','usb-storage'])
     if _usb_first:
@@ -318,6 +322,7 @@ def activate (serial_num, uuid):
             send('USB success')
             try:
                 # return minimized lease
+                print >> sys.stderr, "Checking lease..."
                 return find_lease(serial_num, uuid, keylist)
             except:
                 send('USB fail')
-- 
1.6.2.5