lib/oeqa/utils/sshcontrol.py: helper module for running remote commands

Provides a class for setting up ssh connections,
running commands and copying files to/from a target.

(From OE-Core rev: 683cac9768e0d38fa15ddc5451e6b2333f184033)

Signed-off-by: Stefan Stanacar <stefanx.stanacar@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/lib/oeqa/utils/sshcontrol.py

@@ -0,0 +1,100 @@
+import subprocess
+import time
+import os
+import shlex
+
+class SSHControl(object):
+
+    def __init__(self, host=None, timeout=200, logfile=None):
+        self.host = host
+        self.timeout = timeout
+        self._out = ''
+        self._ret = 126
+        self.logfile = logfile
+
+    def log(self, msg):
+        if self.logfile:
+            with open(self.logfile, "a") as f:
+                f.write("%s\n" % msg)
+
+    def _internal_run(self, cmd):
+        # ssh hangs without os.setsid
+        proc = subprocess.Popen(shlex.split(cmd), shell=False, stdout=subprocess.PIPE, stderr=subprocess.STDOUT, preexec_fn=os.setsid)
+        return proc
+
+    def run(self, cmd, timeout=None):
+        """Run cmd and get it's return code and output.
+        Let it run for timeout seconds and then terminate/kill it,
+        if time is 0 will let cmd run until it finishes.
+        Time can be passed to here or can be set per class instance."""
+
+
+
+        actualcmd = "ssh -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no -l root %s '%s'" % (self.host, cmd)
+        if self.host:
+            sshconn = self._internal_run(actualcmd)
+        else:
+            raise Exception("Remote IP hasn't been set: '%s'" % actualcmd)
+
+        if timeout == 0:
+            self.log("[SSH run without timeout]$ %s" % actualcmd)
+            self.log("  # %s" % cmd)
+            self._out = sshconn.communicate()[0]
+            self._ret = sshconn.poll()
+        else:
+            if timeout is None:
+                endtime = time.time() + self.timeout
+            else:
+                endtime = time.time() + timeout
+            while sshconn.poll() is None and time.time() < endtime:
+                time.sleep(1)
+            self.log("[SSH run with timeout]$ %s" % actualcmd)
+            self.log("  # %s" % cmd)
+            # process hasn't returned yet
+            if sshconn.poll() is None:
+                self._ret = 255
+                sshconn.terminate()
+                sshconn.kill()
+                self._out = sshconn.stdout.read()
+                sshconn.stdout.close()
+                self.log("[!!! process killed]")
+            else:
+                self._out = sshconn.stdout.read()
+                self._ret = sshconn.poll()
+        # remove first line from output which is always smth like (unless return code is 255 - which is a ssh error):
+        # Warning: Permanently added '192.168.7.2' (RSA) to the list of known hosts.
+        if self._ret != 255:
+            self._out = '\n'.join(self._out.splitlines()[1:])
+        self.log("%s" % self._out)
+        self.log("[SSH command returned]: %s" % self._ret)
+        return (self._ret, self._out)
+
+    def _internal_scp(self, cmd):
+        self.log("[SCP]$ %s" % cmd)
+        scpconn = self._internal_run(cmd)
+        try:
+            self._out = scpconn.communicate()[0]
+            self._ret = scpconn.poll()
+            if self._ret != 0:
+                self.log("%s" % self._out)
+                raise Exception("Error copying file")
+        except Exception as e:
+            print("Execution failed: %s :" % cmd)
+            print e
+        self.log("%s" % self._out)
+        return (self._ret, self._out)
+
+    def copy_to(self, localpath, remotepath):
+        actualcmd = "scp -o UserKnownHostsFile=/dev/null  -o StrictHostKeyChecking=no %s root@%s:%s" % (localpath, self.host, remotepath)
+        return self._internal_scp(actualcmd)
+
+
+    def copy_from(self, remotepath, localpath):
+        actualcmd = "scp -o UserKnownHostsFile=/dev/null  -o StrictHostKeyChecking=no root@%s:%s %s" % (self.host, remotepath, localpath)
+        return self._internal_scp(actualcmd)
+
+    def get_status(self):
+        return self._ret
+
+    def get_output(self):
+        return self._out