Add submodule dependency filesHEADmaster

Change-Id: Iaf8d18082d3991dec7c0ebbea540f092188eb4ec

1 files changed, 209 insertions, 0 deletions

diff --git a/roms/u-boot/test/py/u_boot_spawn.py b/roms/u-boot/test/py/u_boot_spawn.py
new file mode 100644
index 000000000..6991b78cc
--- /dev/null
+++ b/roms/u-boot/test/py/u_boot_spawn.py
@@ -0,0 +1,209 @@
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (c) 2015-2016, NVIDIA CORPORATION. All rights reserved.
+
+# Logic to spawn a sub-process and interact with its stdio.
+
+import os
+import re
+import pty
+import signal
+import select
+import time
+
+class Timeout(Exception):
+    """An exception sub-class that indicates that a timeout occurred."""
+    pass
+
+class Spawn(object):
+    """Represents the stdio of a freshly created sub-process. Commands may be
+    sent to the process, and responses waited for.
+
+    Members:
+        output: accumulated output from expect()
+    """
+
+    def __init__(self, args, cwd=None):
+        """Spawn (fork/exec) the sub-process.
+
+        Args:
+            args: array of processs arguments. argv[0] is the command to
+              execute.
+            cwd: the directory to run the process in, or None for no change.
+
+        Returns:
+            Nothing.
+        """
+
+        self.waited = False
+        self.buf = ''
+        self.output = ''
+        self.logfile_read = None
+        self.before = ''
+        self.after = ''
+        self.timeout = None
+        # http://stackoverflow.com/questions/7857352/python-regex-to-match-vt100-escape-sequences
+        self.re_vt100 = re.compile(r'(\x1b\[|\x9b)[^@-_]*[@-_]|\x1b[@-_]', re.I)
+
+        (self.pid, self.fd) = pty.fork()
+        if self.pid == 0:
+            try:
+                # For some reason, SIGHUP is set to SIG_IGN at this point when
+                # run under "go" (www.go.cd). Perhaps this happens under any
+                # background (non-interactive) system?
+                signal.signal(signal.SIGHUP, signal.SIG_DFL)
+                if cwd:
+                    os.chdir(cwd)
+                os.execvp(args[0], args)
+            except:
+                print('CHILD EXECEPTION:')
+                import traceback
+                traceback.print_exc()
+            finally:
+                os._exit(255)
+
+        try:
+            self.poll = select.poll()
+            self.poll.register(self.fd, select.POLLIN | select.POLLPRI | select.POLLERR | select.POLLHUP | select.POLLNVAL)
+        except:
+            self.close()
+            raise
+
+    def kill(self, sig):
+        """Send unix signal "sig" to the child process.
+
+        Args:
+            sig: The signal number to send.
+
+        Returns:
+            Nothing.
+        """
+
+        os.kill(self.pid, sig)
+
+    def isalive(self):
+        """Determine whether the child process is still running.
+
+        Args:
+            None.
+
+        Returns:
+            Boolean indicating whether process is alive.
+        """
+
+        if self.waited:
+            return False
+
+        w = os.waitpid(self.pid, os.WNOHANG)
+        if w[0] == 0:
+            return True
+
+        self.waited = True
+        return False
+
+    def send(self, data):
+        """Send data to the sub-process's stdin.
+
+        Args:
+            data: The data to send to the process.
+
+        Returns:
+            Nothing.
+        """
+
+        os.write(self.fd, data.encode(errors='replace'))
+
+    def expect(self, patterns):
+        """Wait for the sub-process to emit specific data.
+
+        This function waits for the process to emit one pattern from the
+        supplied list of patterns, or for a timeout to occur.
+
+        Args:
+            patterns: A list of strings or regex objects that we expect to
+                see in the sub-process' stdout.
+
+        Returns:
+            The index within the patterns array of the pattern the process
+            emitted.
+
+        Notable exceptions:
+            Timeout, if the process did not emit any of the patterns within
+            the expected time.
+        """
+
+        for pi in range(len(patterns)):
+            if type(patterns[pi]) == type(''):
+                patterns[pi] = re.compile(patterns[pi])
+
+        tstart_s = time.time()
+        try:
+            while True:
+                earliest_m = None
+                earliest_pi = None
+                for pi in range(len(patterns)):
+                    pattern = patterns[pi]
+                    m = pattern.search(self.buf)
+                    if not m:
+                        continue
+                    if earliest_m and m.start() >= earliest_m.start():
+                        continue
+                    earliest_m = m
+                    earliest_pi = pi
+                if earliest_m:
+                    pos = earliest_m.start()
+                    posafter = earliest_m.end()
+                    self.before = self.buf[:pos]
+                    self.after = self.buf[pos:posafter]
+                    self.output += self.buf[:posafter]
+                    self.buf = self.buf[posafter:]
+                    return earliest_pi
+                tnow_s = time.time()
+                if self.timeout:
+                    tdelta_ms = (tnow_s - tstart_s) * 1000
+                    poll_maxwait = self.timeout - tdelta_ms
+                    if tdelta_ms > self.timeout:
+                        raise Timeout()
+                else:
+                    poll_maxwait = None
+                events = self.poll.poll(poll_maxwait)
+                if not events:
+                    raise Timeout()
+                c = os.read(self.fd, 1024).decode(errors='replace')
+                if not c:
+                    raise EOFError()
+                if self.logfile_read:
+                    self.logfile_read.write(c)
+                self.buf += c
+                # count=0 is supposed to be the default, which indicates
+                # unlimited substitutions, but in practice the version of
+                # Python in Ubuntu 14.04 appears to default to count=2!
+                self.buf = self.re_vt100.sub('', self.buf, count=1000000)
+        finally:
+            if self.logfile_read:
+                self.logfile_read.flush()
+
+    def close(self):
+        """Close the stdio connection to the sub-process.
+
+        This also waits a reasonable time for the sub-process to stop running.
+
+        Args:
+            None.
+
+        Returns:
+            Nothing.
+        """
+
+        os.close(self.fd)
+        for i in range(100):
+            if not self.isalive():
+                break
+            time.sleep(0.1)
+
+    def get_expect_output(self):
+        """Return the output read by expect()
+
+        Returns:
+            The output processed by expect(), as a string.
+        """
+        return self.output