oeqa/core/target Add OESSHTarget to sent commands to targets using SSH

With this commit now it is possible to add targets with SSH for testing.
Most of it was imported for existing code, with improvements in log
handling.

[YOCTO #10234]

Signed-off-by: Mariano Lopez <mariano.lopez@linux.intel.com>

1 files changed, 266 insertions, 0 deletions

diff --git a/meta/lib/oeqa/core/target/ssh.py b/meta/lib/oeqa/core/target/ssh.py
new file mode 100644
index 0000000000..b80939c0e5
--- /dev/null
+++ b/meta/lib/oeqa/core/target/ssh.py
@@ -0,0 +1,266 @@
+# Copyright (C) 2016 Intel Corporation
+# Released under the MIT license (see COPYING.MIT)
+
+import os
+import time
+import select
+import logging
+import subprocess
+
+from . import OETarget
+
+class OESSHTarget(OETarget):
+    def __init__(self, logger, ip, server_ip, timeout=300, user='root',
+                 port=None, **kwargs):
+        if not logger:
+            logger = logging.getLogger('target')
+            logger.setLevel(logging.INFO)
+            filePath = os.path.join(os.getcwd(), 'remoteTarget.log')
+            fileHandler = logging.FileHandler(filePath, 'w', 'utf-8')
+            formatter = logging.Formatter(
+                        '%(asctime)s.%(msecs)03d %(levelname)s: %(message)s',
+                        '%H:%M:%S')
+            fileHandler.setFormatter(formatter)
+            logger.addHandler(fileHandler)
+
+        super(OESSHTarget, self).__init__(logger)
+        self.ip = ip
+        self.server_ip = server_ip
+        self.timeout = timeout
+        self.user = user
+        ssh_options = [
+                '-o', 'UserKnownHostsFile=/dev/null',
+                '-o', 'StrictHostKeyChecking=no',
+                '-o', 'LogLevel=ERROR'
+                ]
+        self.ssh = ['ssh', '-l', self.user ] + ssh_options
+        self.scp = ['scp'] + ssh_options
+        if port:
+            self.ssh = self.ssh + [ '-p', port ]
+            self.scp = self.scp + [ '-P', port ]
+
+    def start(self, **kwargs):
+        pass
+
+    def stop(self, **kwargs):
+        pass
+
+    def _run(self, command, timeout=None, ignore_status=True):
+        """
+            Runs command in target using SSHProcess.
+        """
+        self.logger.debug("[Running]$ %s" % " ".join(command))
+
+        starttime = time.time()
+        status, output = SSHCall(command, self.logger, timeout)
+        self.logger.debug("[Command returned '%d' after %.2f seconds]"
+                 "" % (status, time.time() - starttime))
+
+        if status and not ignore_status:
+            raise AssertionError("Command '%s' returned non-zero exit "
+                                 "status %d:\n%s" % (command, status, output))
+
+        return (status, output)
+
+    def run(self, command, timeout=None):
+        """
+            Runs command in target.
+
+            command:    Command to run on target.
+            timeout:    <value>:    Kill command after <val> seconds.
+                        None:       Kill command default value seconds.
+                        0:          No timeout, runs until return.
+        """
+        targetCmd = 'export PATH=/usr/sbin:/sbin:/usr/bin:/bin; %s' % command
+        sshCmd = self.ssh + [self.ip, targetCmd]
+
+        if timeout:
+            processTimeout = timeout
+        elif timeout==0:
+            processTimeout = None
+        else:
+            processTimeout = self.timeout
+
+        status, output = self._run(sshCmd, processTimeout, True)
+        self.logger.info('\nCommand: %s\nOutput:  %s\n' % (command, output))
+        return (status, output)
+
+    def copyTo(self, localSrc, remoteDst):
+        """
+            Copy file to target.
+
+            If local file is symlink, recreate symlink in target.
+        """
+        if os.path.islink(localSrc):
+            link = os.readlink(localSrc)
+            dstDir, dstBase = os.path.split(remoteDst)
+            sshCmd = 'cd %s; ln -s %s %s' % (dstDir, link, dstBase)
+            return self.run(sshCmd)
+
+        else:
+            remotePath = '%s@%s:%s' % (self.user, self.ip, remoteDst)
+            scpCmd = self.scp + [localSrc, remotePath]
+            return self._run(scpCmd, ignore_status=False)
+
+    def copyFrom(self, remoteSrc, localDst):
+        """
+            Copy file from target.
+        """
+        remotePath = '%s@%s:%s' % (self.user, self.ip, remoteSrc)
+        scpCmd = self.scp + [remotePath, localDst]
+        return self._run(scpCmd, ignore_status=False)
+
+    def copyDirTo(self, localSrc, remoteDst):
+        """
+            Copy recursively localSrc directory to remoteDst in target.
+        """
+
+        for root, dirs, files in os.walk(localSrc):
+            # Create directories in the target as needed
+            for d in dirs:
+                tmpDir = os.path.join(root, d).replace(localSrc, "")
+                newDir = os.path.join(remoteDst, tmpDir.lstrip("/"))
+                cmd = "mkdir -p %s" % newDir
+                self.run(cmd)
+
+            # Copy files into the target
+            for f in files:
+                tmpFile = os.path.join(root, f).replace(localSrc, "")
+                dstFile = os.path.join(remoteDst, tmpFile.lstrip("/"))
+                srcFile = os.path.join(root, f)
+                self.copyTo(srcFile, dstFile)
+
+    def deleteFiles(self, remotePath, files):
+        """
+            Deletes files in target's remotePath.
+        """
+
+        cmd = "rm"
+        if not isinstance(files, list):
+            files = [files]
+
+        for f in files:
+            cmd = "%s %s" % (cmd, os.path.join(remotePath, f))
+
+        self.run(cmd)
+
+
+    def deleteDir(self, remotePath):
+        """
+            Deletes target's remotePath directory.
+        """
+
+        cmd = "rmdir %s" % remotePath
+        self.run(cmd)
+
+
+    def deleteDirStructure(self, localPath, remotePath):
+        """
+        Delete recursively localPath structure directory in target's remotePath.
+
+        This function is very usefult to delete a package that is installed in
+        the DUT and the host running the test has such package extracted in tmp
+        directory.
+
+        Example:
+            pwd: /home/user/tmp
+            tree:   .
+                    └── work
+                        ├── dir1
+                        │   └── file1
+                        └── dir2
+
+            localpath = "/home/user/tmp" and remotepath = "/home/user"
+
+            With the above variables this function will try to delete the
+            directory in the DUT in this order:
+                /home/user/work/dir1/file1
+                /home/user/work/dir1        (if dir is empty)
+                /home/user/work/dir2        (if dir is empty)
+                /home/user/work             (if dir is empty)
+        """
+
+        for root, dirs, files in os.walk(localPath, topdown=False):
+            # Delete files first
+            tmpDir = os.path.join(root).replace(localPath, "")
+            remoteDir = os.path.join(remotePath, tmpDir.lstrip("/"))
+            self.deleteFiles(remoteDir, files)
+
+            # Remove dirs if empty
+            for d in dirs:
+                tmpDir = os.path.join(root, d).replace(localPath, "")
+                remoteDir = os.path.join(remotePath, tmpDir.lstrip("/"))
+                self.deleteDir(remoteDir)
+
+def SSHCall(command, logger, timeout=None, **opts):
+
+    def run():
+        nonlocal output
+        nonlocal process
+        starttime = time.time()
+        process = subprocess.Popen(command, **options)
+        if timeout:
+            endtime = starttime + timeout
+            eof = False
+            while time.time() < endtime and not eof:
+                logger.debug('time: %s, endtime: %s' % (time.time(), endtime))
+                try:
+                    if select.select([process.stdout], [], [], 5)[0] != []:
+                        data = os.read(process.stdout.fileno(), 1024)
+                        if not data:
+                            process.stdout.close()
+                            eof = True
+                        else:
+                            data = data.decode("utf-8")
+                            output += data
+                            logger.debug('Partial data from SSH call: %s' % data)
+                            endtime = time.time() + timeout
+                except InterruptedError:
+                    continue
+
+            # process hasn't returned yet
+            if not eof:
+                process.terminate()
+                time.sleep(5)
+                try:
+                    process.kill()
+                except OSError:
+                    pass
+                endtime = time.time() - starttime
+                lastline = ("\nProcess killed - no output for %d seconds. Total"
+                            " running time: %d seconds." % (timeout, endtime))
+                logger.debug('Received data from SSH call %s ' % lastline)
+                output += lastline
+
+        else:
+            output = process.communicate()[0].decode("utf-8")
+            logger.debug('Data from SSH call: %s' % output.rstrip())
+
+    options = {
+        "stdout": subprocess.PIPE,
+        "stderr": subprocess.STDOUT,
+        "stdin": None,
+        "shell": False,
+        "bufsize": -1,
+        "preexec_fn": os.setsid,
+    }
+    options.update(opts)
+    output = ''
+    process = None
+
+    # Unset DISPLAY which means we won't trigger SSH_ASKPASS
+    env = os.environ.copy()
+    if "DISPLAY" in env:
+        del env['DISPLAY']
+    options['env'] = env
+
+    try:
+        run()
+    except:
+        # Need to guard against a SystemExit or other exception ocurring
+        # whilst running and ensure we don't leave a process behind.
+        if process.poll() is None:
+            process.kill()
+        logger.debug('Something went wrong, killing SSH process')
+        raise
+    return (process.wait(), output.rstrip())