oeqa: tolerate interrupted select() while waiting for qemu

Sometimes, the OEQA utility code aborts with:

   ...
   File ".../meta/lib/oeqa/utils/qemurunner.py", line 131, in start
     return self.launch(launch_cmd, qemuparams=qemuparams, get_ip=get_ip, extra_bootparams=extra_bootparams)
   File ".../meta/lib/oeqa/utils/qemurunner.py", line 259, in launch
     sread, swrite, serror = select.select(socklist, [], [], 5)
  InterruptedError: [Errno 4] Interrupted system call

strace shows that this is because of a SIGWINCH:

   Connection from 127.0.0.1:52668
   select(21, [20], [], [], {5, 0})        = ? ERESTARTNOHAND (To be restarted if no handler)
   --- SIGWINCH {si_signo=SIGWINCH, si_code=SI_KERNEL} ---

This is related to some special conditions:
 * whether qemu opens a graphical console window (enabled in Poky by default)
 * where that window gets opened
 * whether the window manager changes the size of the shell window (mine
   is a tiling window manager and reorders and resizes windows automatically)

Ignoring the interrupted system calls avoids the problem. Code elsewhere (for example,
run() in ssh.py) already does the same thing.

Signed-off-by: Patrick Ohly <patrick.ohly@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

2 files changed, 12 insertions, 3 deletions

diff --git a/meta/lib/oeqa/utils/qemurunner.py b/meta/lib/oeqa/utils/qemurunner.py
index 95f59257ca..b7816167e8 100644
--- a/meta/lib/oeqa/utils/qemurunner.py
+++ b/meta/lib/oeqa/utils/qemurunner.py
@@ -256,7 +256,10 @@ class QemuRunner:
             bootlog = ''
             data = b''
             while time.time() < endtime and not stopread:
-                sread, swrite, serror = select.select(socklist, [], [], 5)
+                try:
+                    sread, swrite, serror = select.select(socklist, [], [], 5)
+                except InterruptedError:
+                    continue
                 for sock in sread:
                     if sock is self.server_socket:
                         qemusock, addr = self.server_socket.accept()
@@ -437,7 +440,10 @@ class QemuRunner:
             if now >= end:
                 data += "<<< run_serial(): command timed out after %d seconds without output >>>\r\n\r\n" % timeout
                 break
-            sread, _, _ = select.select([self.server_socket],[],[], end - now)
+            try:
+                sread, _, _ = select.select([self.server_socket],[],[], end - now)
+            except InterruptedError:
+                continue
             if sread:
                 answer = self.server_socket.recv(1024)
                 if answer:
diff --git a/meta/lib/oeqa/utils/qemutinyrunner.py b/meta/lib/oeqa/utils/qemutinyrunner.py
index b1009a0a37..df5f9ddb82 100644
--- a/meta/lib/oeqa/utils/qemutinyrunner.py
+++ b/meta/lib/oeqa/utils/qemutinyrunner.py
@@ -114,7 +114,10 @@ class QemuTinyRunner(QemuRunner):
         stopread = False
         endtime = time.time()+timeout
         while time.time()<endtime and not stopread:
-                sread, _, _ = select.select([self.server_socket],[],[],1)
+                try:
+                        sread, _, _ = select.select([self.server_socket],[],[],1)
+                except InterruptedError:
+                        continue
                 for sock in sread:
                         answer = sock.recv(1024)
                         if answer: