DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Mercurial (5b81998bb7ab)

VCS Links

Line Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this file,
# You can obtain one at http://mozilla.org/MPL/2.0/.

import mozlog
import subprocess
from devicemanager import DeviceManager, DMError, _pop_last_line
import re
import os
import shutil
import tempfile
import time

class DeviceManagerADB(DeviceManager):
    """
    Implementation of DeviceManager interface that uses the Android "adb"
    utility to communicate with the device. Normally used to communicate
    with a device that is directly connected with the host machine over a USB
    port.
    """

    _haveRootShell = False
    _haveSu = False
    _useRunAs = False
    _useZip = False
    _logcatNeedsRoot = False
    _pollingInterval = 0.01
    _packageName = None
    _tempDir = None
    default_timeout = 300

    def __init__(self, host=None, port=5555, retryLimit=5, packageName='fennec',
                 adbPath='adb', deviceSerial=None, deviceRoot=None,
                 logLevel=mozlog.ERROR, **kwargs):
        DeviceManager.__init__(self, logLevel)
        self.host = host
        self.port = port
        self.retryLimit = retryLimit
        self.deviceRoot = deviceRoot

        # the path to adb, or 'adb' to assume that it's on the PATH
        self._adbPath = adbPath

        # The serial number of the device to use with adb, used in cases
        # where multiple devices are being managed by the same adb instance.
        self._deviceSerial = deviceSerial

        if packageName == 'fennec':
            if os.getenv('USER'):
                self._packageName = 'org.mozilla.fennec_' + os.getenv('USER')
            else:
                self._packageName = 'org.mozilla.fennec_'
        elif packageName:
            self._packageName = packageName

        # verify that we can run the adb command. can't continue otherwise
        self._verifyADB()

        # try to connect to the device over tcp/ip if we have a hostname
        if self.host:
            self._connectRemoteADB()

        # verify that we can connect to the device. can't continue
        self._verifyDevice()

        # set up device root
        self._setupDeviceRoot()

        # Some commands require root to work properly, even with ADB (e.g.
        # grabbing APKs out of /data). For these cases, we check whether
        # we're running as root. If that isn't true, check for the
        # existence of an su binary
        self._checkForRoot()

        # Can we use run-as? (not required)
        try:
            self._verifyRunAs()
        except DMError:
            pass

        # can we use zip to speed up some file operations? (currently not
        # required)
        try:
            self._verifyZip()
        except DMError:
            pass

    def __del__(self):
        if self.host:
            self._disconnectRemoteADB()

    def shell(self, cmd, outputfile, env=None, cwd=None, timeout=None, root=False):
        # FIXME: this function buffers all output of the command into memory,
        # always. :(

        # If requested to run as root, check that we can actually do that
        if root and not self._haveRootShell and not self._haveSu:
            raise DMError("Shell command '%s' requested to run as root but root "
                          "is not available on this device. Root your device or "
                          "refactor the test/harness to not require root." %
                          self._escapedCommandLine(cmd))

        # Getting the return code is more complex than you'd think because adb
        # doesn't actually return the return code from a process, so we have to
        # capture the output to get it
        if root and not self._haveRootShell:
            cmdline = "su -c \"%s\"" % self._escapedCommandLine(cmd)
        else:
            cmdline = self._escapedCommandLine(cmd)
        cmdline += "; echo $?"

        # prepend cwd and env to command if necessary
        if cwd:
            cmdline = "cd %s; %s" % (cwd, cmdline)
        if env:
            envstr = '; '.join(map(lambda x: 'export %s=%s' % (x[0], x[1]), env.iteritems()))
            cmdline = envstr + "; " + cmdline

        # all output should be in stdout
        args=[self._adbPath]
        if self._deviceSerial:
            args.extend(['-s', self._deviceSerial])
        args.extend(["shell", cmdline])

        procOut = tempfile.SpooledTemporaryFile()
        procErr = tempfile.SpooledTemporaryFile()
        proc = subprocess.Popen(args, stdout=procOut, stderr=procErr)

        if not timeout:
            # We are asserting that all commands will complete in this time unless otherwise specified
            timeout = self.default_timeout

        timeout = int(timeout)
        start_time = time.time()
        ret_code = proc.poll()
        while ((time.time() - start_time) <= timeout) and ret_code == None:
            time.sleep(self._pollingInterval)
            ret_code = proc.poll()
        if ret_code == None:
            proc.kill()
            raise DMError("Timeout exceeded for shell call")

        procOut.seek(0)
        outputfile.write(procOut.read().rstrip('\n'))
        procOut.close()
        procErr.close()

        lastline = _pop_last_line(outputfile)
        if lastline:
            m = re.search('([0-9]+)', lastline)
            if m:
                return_code = m.group(1)
                outputfile.seek(-2, 2)
                outputfile.truncate() # truncate off the return code
                return int(return_code)

        return None

    def _connectRemoteADB(self):
        self._checkCmd(["connect", self.host + ":" + str(self.port)])

    def _disconnectRemoteADB(self):
        self._checkCmd(["disconnect", self.host + ":" + str(self.port)])

    def pushFile(self, localname, destname, retryLimit=None):
        # you might expect us to put the file *in* the directory in this case,
        # but that would be different behaviour from devicemanagerSUT. Throw
        # an exception so we have the same behaviour between the two
        # implementations
        retryLimit = retryLimit or self.retryLimit
        if self.dirExists(destname):
            raise DMError("Attempted to push a file (%s) to a directory (%s)!" %
                          (localname, destname))
        if not os.access(localname, os.F_OK):
            raise DMError("File not found: %s" % localname)

        if self._useRunAs:
            remoteTmpFile = self.getTempDir() + "/" + os.path.basename(localname)
            self._checkCmd(["push", os.path.realpath(localname), remoteTmpFile],
                    retryLimit=retryLimit)
            self.shellCheckOutput(["dd", "if=" + remoteTmpFile, "of=" + destname])
            self.shellCheckOutput(["rm", remoteTmpFile])
        else:
            self._checkCmd(["push", os.path.realpath(localname), destname],
                    retryLimit=retryLimit)

    def mkDir(self, name):
        result = self._runCmdAs(["shell", "mkdir", name]).stdout.read()
        if 'read-only file system' in result.lower():
            raise DMError("Error creating directory: read only file system")

    def pushDir(self, localDir, remoteDir, retryLimit=None):
        # adb "push" accepts a directory as an argument, but if the directory
        # contains symbolic links, the links are pushed, rather than the linked
        # files; we either zip/unzip or re-copy the directory into a temporary
        # one to get around this limitation
        retryLimit = retryLimit or self.retryLimit
        if not self.dirExists(remoteDir):
            self.mkDirs(remoteDir+"/x")
        if self._useZip:
            try:
                localZip = tempfile.mktemp() + ".zip"
                remoteZip = remoteDir + "/adbdmtmp.zip"
                subprocess.Popen(["zip", "-r", localZip, '.'], cwd=localDir,
                                 stdout=subprocess.PIPE, stderr=subprocess.PIPE).communicate()
                self.pushFile(localZip, remoteZip, retryLimit=retryLimit)
                os.remove(localZip)
                data = self._runCmdAs(["shell", "unzip", "-o", remoteZip,
                                       "-d", remoteDir]).stdout.read()
                self._checkCmdAs(["shell", "rm", remoteZip], retryLimit=retryLimit)
                if re.search("unzip: exiting", data) or re.search("Operation not permitted", data):
                    raise Exception("unzip failed, or permissions error")
            except:
                self._logger.info("zip/unzip failure: falling back to normal push")
                self._useZip = False
                self.pushDir(localDir, remoteDir, retryLimit=retryLimit)
        else:
            tmpDir = tempfile.mkdtemp()
            # copytree's target dir must not already exist, so create a subdir
            tmpDirTarget = os.path.join(tmpDir, "tmp")
            shutil.copytree(localDir, tmpDirTarget)
            self._checkCmd(["push", tmpDirTarget, remoteDir], retryLimit=retryLimit)
            shutil.rmtree(tmpDir)

    def dirExists(self, remotePath):
        p = self._runCmd(["shell", "ls", "-a", remotePath + '/'])

        data = p.stdout.readlines()
        if len(data) == 1:
            res = data[0]
            if "Not a directory" in res or "No such file or directory" in res:
                return False
        return True

    def fileExists(self, filepath):
        p = self._runCmd(["shell", "ls", "-a", filepath])
        data = p.stdout.readlines()
        if len(data) == 1:
            foundpath = data[0].decode('utf-8').rstrip()
            if foundpath == filepath:
                return True
        return False

    def removeFile(self, filename):
        if self.fileExists(filename):
            self._runCmd(["shell", "rm", filename])

    def removeDir(self, remoteDir):
        if (self.dirExists(remoteDir)):
            self._runCmd(["shell", "rm", "-r", remoteDir]).wait()
        else:
            self.removeFile(remoteDir.strip())

    def listFiles(self, rootdir):
        p = self._runCmd(["shell", "ls", "-a", rootdir])
        data = p.stdout.readlines()
        data[:] = [item.rstrip('\r\n') for item in data]
        if (len(data) == 1):
            if (data[0] == rootdir):
                return []
            if (data[0].find("No such file or directory") != -1):
                return []
            if (data[0].find("Not a directory") != -1):
                return []
            if (data[0].find("Permission denied") != -1):
                return []
            if (data[0].find("opendir failed") != -1):
                return []
        return data

    def getProcessList(self):
        p = self._runCmd(["shell", "ps"])
            # first line is the headers
        p.stdout.readline()
        proc = p.stdout.readline()
        ret = []
        while (proc):
            els = proc.split()
            # we need to figure out if this is "user pid name" or "pid user vsz stat command"
            if els[1].isdigit():
                ret.append(list([int(els[1]), els[len(els) - 1], els[0]]))
            else:
                ret.append(list([int(els[0]), els[len(els) - 1], els[1]]))
            proc =  p.stdout.readline()
        return ret

    def fireProcess(self, appname, failIfRunning=False):
        """
        Starts a process

        returns: pid

        DEPRECATED: Use shell() or launchApplication() for new code
        """
        #strip out env vars
        parts = appname.split('"');
        if (len(parts) > 2):
            parts = parts[2:]
        return self.launchProcess(parts, failIfRunning)

    def launchProcess(self, cmd, outputFile = "process.txt", cwd = '', env = '', failIfRunning=False):
        """
        Launches a process, redirecting output to standard out

        WARNING: Does not work how you expect on Android! The application's
        own output will be flushed elsewhere.

        DEPRECATED: Use shell() or launchApplication() for new code
        """
        if cmd[0] == "am":
            self._checkCmd(["shell"] + cmd)
            return outputFile

        acmd = ["shell", "am", "start", "-W"]
        cmd = ' '.join(cmd).strip()
        i = cmd.find(" ")
        # SUT identifies the URL by looking for :\\ -- another strategy to consider
        re_url = re.compile('^[http|file|chrome|about].*')
        last = cmd.rfind(" ")
        uri = ""
        args = ""
        if re_url.match(cmd[last:].strip()):
            args = cmd[i:last].strip()
            uri = cmd[last:].strip()
        else:
            args = cmd[i:].strip()
        acmd.append("-n")
        acmd.append(cmd[0:i] + "/.App")
        if args != "":
            acmd.append("--es")
            acmd.append("args")
            acmd.append(args)
        if env != '' and env != None:
            envCnt = 0
            # env is expected to be a dict of environment variables
            for envkey, envval in env.iteritems():
                acmd.append("--es")
                acmd.append("env" + str(envCnt))
                acmd.append(envkey + "=" + envval);
                envCnt += 1
        if uri != "":
            acmd.append("-d")
            acmd.append(''.join(['\'',uri, '\'']));
        self._logger.info(acmd)
        self._checkCmd(acmd)
        return outputFile

    def killProcess(self, appname, forceKill=False):
        procs = self.getProcessList()
        for (pid, name, user) in procs:
            if name == appname:
                args = ["shell", "kill"]
                if forceKill:
                    args.append("-9")
                args.append(str(pid))
                p = self._runCmdAs(args)
                p.communicate()
                if p.returncode != 0:
                    raise DMError("Error killing process "
                                  "'%s': %s" % (appname, p.stdout.read()))

    def _runPull(self, remoteFile, localFile):
        """
        Pulls remoteFile from device to host
        """
        try:
            # First attempt to pull file regularly
            outerr = self._runCmd(["pull",  remoteFile, localFile]).communicate()

            # Now check stderr for errors
            if outerr[1]:
                errl = outerr[1].splitlines()
                if (len(errl) == 1):
                    if (((errl[0].find("Permission denied") != -1)
                        or (errl[0].find("does not exist") != -1))
                        and self._useRunAs):
                        # If we lack permissions to read but have run-as, then we should try
                        # to copy the file to a world-readable location first before attempting
                        # to pull it again.
                        remoteTmpFile = self.getTempDir() + "/" + os.path.basename(remoteFile)
                        self._checkCmdAs(["shell", "dd", "if=" + remoteFile, "of=" + remoteTmpFile])
                        self._checkCmdAs(["shell", "chmod", "777", remoteTmpFile])
                        self._runCmd(["pull",  remoteTmpFile, localFile]).stdout.read()
                        # Clean up temporary file
                        self._checkCmdAs(["shell", "rm", remoteTmpFile])
        except (OSError, ValueError):
            raise DMError("Error pulling remote file '%s' to '%s'" % (remoteFile, localFile))

    def pullFile(self, remoteFile):
        # TODO: add debug flags and allow for printing stdout
        localFile = tempfile.mkstemp()[1]
        self._runPull(remoteFile, localFile)

        f = open(localFile, 'r')
        ret = f.read()
        f.close()
        os.remove(localFile)
        return ret

    def getFile(self, remoteFile, localFile):
        self._runPull(remoteFile, localFile)

    def getDirectory(self, remoteDir, localDir, checkDir=True):
        self._runCmd(["pull", remoteDir, localDir]).wait()

    def validateFile(self, remoteFile, localFile):
        md5Remote = self._getRemoteHash(remoteFile)
        md5Local = self._getLocalHash(localFile)
        if md5Remote is None or md5Local is None:
            return None
        return md5Remote == md5Local

    def _getRemoteHash(self, remoteFile):
        """
        Return the md5 sum of a file on the device
        """
        localFile = tempfile.mkstemp()[1]
        localFile = self._runPull(remoteFile, localFile)

        if localFile is None:
            return None

        md5 = self._getLocalHash(localFile)
        os.remove(localFile)

        return md5

    def _setupDeviceRoot(self):
        """
        setup the device root and cache its value
        """
        # if self.deviceRoot is already set, create it if necessary, and use it
        if self.deviceRoot:
            if not self.dirExists(self.deviceRoot):
                try:
                    self.mkDir(self.deviceRoot)
                except:
                    self._logger.error("Unable to create device root %s" % self.deviceRoot)
                    raise
            return

        paths = [('/mnt/sdcard', 'tests'),
                 ('/data/local', 'tests')]
        for (basePath, subPath) in paths:
            if self.dirExists(basePath):
                testRoot = os.path.join(basePath, subPath)
                try:
                    self.mkDir(testRoot)
                    self.deviceRoot = testRoot
                    return
                except:
                    pass

        raise DMError("Unable to set up device root using paths: [%s]"
                        % ", ".join(["'%s'" % os.path.join(b, s) for b, s in paths]))

    def getDeviceRoot(self):
        return self.deviceRoot

    def getTempDir(self):
        # Cache result to speed up operations depending
        # on the temporary directory.
        if not self._tempDir:
            self._tempDir = self.getDeviceRoot() + "/tmp"
            self.mkDir(self._tempDir)

        return self._tempDir

    def getAppRoot(self, packageName):
        devroot = self.getDeviceRoot()
        if (devroot == None):
            return None

        if (packageName and self.dirExists('/data/data/' + packageName)):
            self._packageName = packageName
            return '/data/data/' + packageName
        elif (self._packageName and self.dirExists('/data/data/' + self._packageName)):
            return '/data/data/' + self._packageName

        # Failure (either not installed or not a recognized platform)
        raise DMError("Failed to get application root for: %s" % packageName)

    def reboot(self, wait = False, **kwargs):
        self._runCmd(["reboot"])
        if (not wait):
            return
        countdown = 40
        while (countdown > 0):
            self._checkCmd(["wait-for-device", "shell", "ls", "/sbin"])

    def updateApp(self, appBundlePath, **kwargs):
        return self._runCmd(["install", "-r", appBundlePath]).stdout.read()

    def getCurrentTime(self):
        timestr = self._runCmd(["shell", "date", "+%s"]).stdout.read().strip()
        if (not timestr or not timestr.isdigit()):
            raise DMError("Unable to get current time using date (got: '%s')" % timestr)
        return str(int(timestr)*1000)

    def getInfo(self, directive=None):
        ret = {}
        if (directive == "id" or directive == "all"):
            ret["id"] = self._runCmd(["get-serialno"]).stdout.read()
        if (directive == "os" or directive == "all"):
            ret["os"] = self._runCmd(["shell", "getprop", "ro.build.display.id"]).stdout.read()
        if (directive == "uptime" or directive == "all"):
            utime = self._runCmd(["shell", "uptime"]).stdout.read()
            if (not utime):
                raise DMError("error getting uptime")
            utime = utime[9:]
            hours = utime[0:utime.find(":")]
            utime = utime[utime[1:].find(":") + 2:]
            minutes = utime[0:utime.find(":")]
            utime = utime[utime[1:].find(":") +  2:]
            seconds = utime[0:utime.find(",")]
            ret["uptime"] = ["0 days " + hours + " hours " + minutes + " minutes " + seconds + " seconds"]
        if (directive == "process" or directive == "all"):
            ret["process"] = self._runCmd(["shell", "ps"]).stdout.read()
        if (directive == "systime" or directive == "all"):
            ret["systime"] = self._runCmd(["shell", "date"]).stdout.read()
        self._logger.info(ret)
        return ret

    def uninstallApp(self, appName, installPath=None):
        data = self._runCmd(["uninstall", appName]).stdout.read().strip()
        status = data.split('\n')[0].strip()
        if status != 'Success':
            raise DMError("uninstall failed for %s. Got: %s" % (appName, status))

    def uninstallAppAndReboot(self, appName, installPath=None):
        self.uninstallApp(appName)
        self.reboot()
        return

    def _runCmd(self, args):
        """
        Runs a command using adb

        returns: returncode from subprocess.Popen
        """
        finalArgs = [self._adbPath]
        if self._deviceSerial:
            finalArgs.extend(['-s', self._deviceSerial])
        # use run-as to execute commands as the package we're testing if
        # possible
        if not self._haveRootShell and self._useRunAs and \
                args[0] == "shell" and args[1] not in [ "run-as", "am" ]:
            args.insert(1, "run-as")
            args.insert(2, self._packageName)
        finalArgs.extend(args)
        return subprocess.Popen(finalArgs, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)

    def _runCmdAs(self, args):
        """
        Runs a command using adb
        If self._useRunAs is True, the command is run-as user specified in self._packageName

        returns: returncode from subprocess.Popen
        """
        if self._useRunAs:
            args.insert(1, "run-as")
            args.insert(2, self._packageName)
        return self._runCmd(args)

    # timeout is specified in seconds, and if no timeout is given,
    # we will run until we hit the default_timeout specified in the __init__
    def _checkCmd(self, args, timeout=None, retryLimit=None):
        """
        Runs a command using adb and waits for the command to finish.
        If timeout is specified, the process is killed after <timeout> seconds.

        returns: returncode from subprocess.Popen
        """
        retryLimit = retryLimit or self.retryLimit
        # use run-as to execute commands as the package we're testing if
        # possible
        finalArgs = [self._adbPath]
        if self._deviceSerial:
            finalArgs.extend(['-s', self._deviceSerial])
        if not self._haveRootShell and self._useRunAs and \
                args[0] == "shell" and args[1] not in [ "run-as", "am" ]:
            args.insert(1, "run-as")
            args.insert(2, self._packageName)
        finalArgs.extend(args)
        if not timeout:
            # We are asserting that all commands will complete in this time unless otherwise specified
            timeout = self.default_timeout

        timeout = int(timeout)
        retries = 0
        while retries < retryLimit:
            proc = subprocess.Popen(finalArgs, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
            start_time = time.time()
            ret_code = proc.poll()
            while ((time.time() - start_time) <= timeout) and ret_code == None:
                time.sleep(self._pollingInterval)
                ret_code = proc.poll()
            if ret_code == None:
                proc.kill()
                retries += 1
                continue
            return ret_code
        raise DMError("Timeout exceeded for _checkCmd call after %d retries." % retries)

    def _checkCmdAs(self, args, timeout=None, retryLimit=None):
        """
        Runs a command using adb and waits for command to finish
        If self._useRunAs is True, the command is run-as user specified in self._packageName
        If timeout is specified, the process is killed after <timeout> seconds

        returns: returncode from subprocess.Popen
        """
        retryLimit = retryLimit or self.retryLimit
        if (self._useRunAs):
            args.insert(1, "run-as")
            args.insert(2, self._packageName)
        return self._checkCmd(args, timeout, retryLimit=retryLimit)

    def chmodDir(self, remoteDir, mask="777"):
        if (self.dirExists(remoteDir)):
            files = self.listFiles(remoteDir.strip())
            for f in files:
                remoteEntry = remoteDir.strip() + "/" + f.strip()
                if (self.dirExists(remoteEntry)):
                    self.chmodDir(remoteEntry)
                else:
                    self._checkCmdAs(["shell", "chmod", mask, remoteEntry])
                    self._logger.info("chmod %s" % remoteEntry)
            self._checkCmdAs(["shell", "chmod", mask, remoteDir])
            self._logger.info("chmod %s" % remoteDir)
        else:
            self._checkCmdAs(["shell", "chmod", mask, remoteDir.strip()])
            self._logger.info("chmod %s" % remoteDir.strip())

    def _verifyADB(self):
        """
        Check to see if adb itself can be executed.
        """
        if self._adbPath != 'adb':
            if not os.access(self._adbPath, os.X_OK):
                raise DMError("invalid adb path, or adb not executable: %s" % self._adbPath)

        try:
            self._checkCmd(["version"])
        except os.error, err:
            raise DMError("unable to execute ADB (%s): ensure Android SDK is installed and adb is in your $PATH" % err)
        except subprocess.CalledProcessError:
            raise DMError("unable to execute ADB: ensure Android SDK is installed and adb is in your $PATH")

    def _verifyDevice(self):
        # If there is a device serial number, see if adb is connected to it
        if self._deviceSerial:
            deviceStatus = None
            proc = subprocess.Popen([self._adbPath, "devices"],
                                    stdout=subprocess.PIPE,
                                    stderr=subprocess.STDOUT)
            for line in proc.stdout:
                m = re.match('(.+)?\s+(.+)$', line)
                if m:
                    if self._deviceSerial == m.group(1):
                        deviceStatus = m.group(2)
            if deviceStatus == None:
                raise DMError("device not found: %s" % self._deviceSerial)
            elif deviceStatus != "device":
                raise DMError("bad status for device %s: %s" % (self._deviceSerial, deviceStatus))

        # Check to see if we can connect to device and run a simple command
        ret = None
        try:
            ret = self._checkCmd(["shell", "echo"])
        except subprocess.CalledProcessError:
            raise DMError("unable to connect to device: is it plugged in?")
        if ret:
            raise DMError("unable to connect to device")

    def _verifyRunAs(self):
        # If a valid package name is available, and certain other
        # conditions are met, devicemanagerADB can execute file operations
        # via the "run-as" command, so that pushed files and directories
        # are created by the uid associated with the package, more closely
        # echoing conditions encountered by Fennec at run time.
        # Check to see if run-as can be used here, by verifying a
        # file copy via run-as.
        self._useRunAs = False
        devroot = self.getDeviceRoot()
        if self._packageName and devroot:
            tmpDir = self.getTempDir()

            # The problem here is that run-as doesn't cause a non-zero exit code
            # when failing because of a non-existent or non-debuggable package :(
            runAsOut = self._runCmd(["shell", "run-as", self._packageName, "mkdir", devroot + "/sanity"]).communicate()[0]
            if runAsOut.startswith("run-as:") and ("not debuggable" in runAsOut or "is unknown" in runAsOut):
                raise DMError("run-as failed sanity check")

            tmpfile = tempfile.NamedTemporaryFile()
            self._checkCmd(["push", tmpfile.name, tmpDir + "/tmpfile"])
            self._checkCmd(["shell", "run-as", self._packageName, "dd", "if=" + tmpDir + "/tmpfile", "of=" + devroot + "/sanity/tmpfile"])
            if (self.fileExists(devroot + "/sanity/tmpfile")):
                self._logger.info("will execute commands via run-as %s" % self._packageName)
                self._useRunAs = True
            self._checkCmd(["shell", "rm", devroot + "/tmp/tmpfile"])
            self._checkCmd(["shell", "run-as", self._packageName, "rm", "-r", devroot + "/sanity"])

    def _checkForRoot(self):
        # Check whether we _are_ root by default (some development boards work
        # this way, this is also the result of some relatively rare rooting
        # techniques)
        proc = self._runCmd(["shell", "id"])
        data = proc.stdout.read()
        if data.find('uid=0(root)') >= 0:
            self._haveRootShell = True
            # if this returns true, we don't care about su
            return

        # if root shell is not available, check if 'su' can be used to gain
        # root
        proc = self._runCmd(["shell", "su", "-c", "id"])

        # wait for response for maximum of 15 seconds, in case su prompts for a
        # password or triggers the Android SuperUser prompt
        start_time = time.time()
        retcode = None
        while (time.time() - start_time) <= 15 and retcode is None:
            retcode = proc.poll()
        if retcode is None: # still not terminated, kill
            proc.kill()

        data = proc.stdout.read()
        if data.find('uid=0(root)') >= 0:
            self._haveSu = True

    def _isUnzipAvailable(self):
        data = self._runCmdAs(["shell", "unzip"]).stdout.read()
        if (re.search('Usage', data)):
            return True
        else:
            return False

    def _isLocalZipAvailable(self):
        try:
            subprocess.check_call(["zip", "-?"], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
        except:
            return False
        return True

    def _verifyZip(self):
        # If "zip" can be run locally, and "unzip" can be run remotely, then pushDir
        # can use these to push just one file per directory -- a significant
        # optimization for large directories.
        self._useZip = False
        if (self._isUnzipAvailable() and self._isLocalZipAvailable()):
            self._logger.info("will use zip to push directories")
            self._useZip = True
        else:
            raise DMError("zip not available")