#!/usr/bin/env python
#
# run-tests.py - Run a set of tests on Mercurial
#
# Copyright 2006 Matt Mackall <mpm@selenic.com>
#
# This software may be used and distributed according to the terms
# of the GNU General Public License, incorporated herein by reference.

import difflib
import errno
import optparse
import os
import popen2
import re
import shutil
import signal
import sys
import tempfile
import time

# hghave reserved exit code to skip test
SKIPPED_STATUS = 80

required_tools = ["python", "diff", "grep", "unzip", "gunzip", "bunzip2", "sed"]

parser = optparse.OptionParser("%prog [options] [tests]")
parser.add_option("-C", "--annotate", action="store_true",
    help="output files annotated with coverage")
parser.add_option("--child", type="int",
    help="run as child process, summary to given fd")
parser.add_option("-c", "--cover", action="store_true",
    help="print a test coverage report")
parser.add_option("-f", "--first", action="store_true",
    help="exit on the first test failure")
parser.add_option("-i", "--interactive", action="store_true",
    help="prompt to accept changed output")
parser.add_option("-j", "--jobs", type="int",
    help="number of jobs to run in parallel")
parser.add_option("-R", "--restart", action="store_true",
    help="restart at last error")
parser.add_option("-p", "--port", type="int",
    help="port on which servers should listen")
parser.add_option("-r", "--retest", action="store_true",
    help="retest failed tests")
parser.add_option("-s", "--cover_stdlib", action="store_true",
    help="print a test coverage report inc. standard libraries")
parser.add_option("-t", "--timeout", type="int",
    help="kill errant tests after TIMEOUT seconds")
parser.add_option("--tmpdir", type="string",
    help="run tests in the given temporary directory")
parser.add_option("-v", "--verbose", action="store_true",
    help="output verbose messages")
parser.add_option("--with-hg", type="string",
    help="test existing install at given location")

parser.set_defaults(jobs=1, port=20059, timeout=180)
(options, args) = parser.parse_args()
verbose = options.verbose
coverage = options.cover or options.cover_stdlib or options.annotate
python = sys.executable

if options.jobs < 1:
    print >> sys.stderr, 'ERROR: -j/--jobs must be positive'
    sys.exit(1)
if options.interactive and options.jobs > 1:
    print >> sys.stderr, 'ERROR: cannot mix -interactive and --jobs > 1'
    sys.exit(1)

def vlog(*msg):
    if verbose:
        for m in msg:
            print m,
        print

def splitnewlines(text):
    '''like str.splitlines, but only split on newlines.
    keep line endings.'''
    i = 0
    lines = []
    while True:
        n = text.find('\n', i)
        if n == -1:
            last = text[i:]
            if last:
                lines.append(last)
            return lines
        lines.append(text[i:n+1])
        i = n + 1

def extract_missing_features(lines):
    '''Extract missing/unknown features log lines as a list'''
    missing = []
    for line in lines:
        if not line.startswith('hghave: '):
            continue
        line = line.splitlines()[0]
        missing.append(line[8:])

    return missing

def show_diff(expected, output):
    for line in difflib.unified_diff(expected, output,
            "Expected output", "Test output"):
        sys.stdout.write(line)

def find_program(program):
    """Search PATH for a executable program"""
    for p in os.environ.get('PATH', os.defpath).split(os.pathsep):
        name = os.path.join(p, program)
        if os.access(name, os.X_OK):
            return name
    return None

def check_required_tools():
    # Before we go any further, check for pre-requisite tools
    # stuff from coreutils (cat, rm, etc) are not tested
    for p in required_tools:
        if os.name == 'nt':
            p += '.exe'
        found = find_program(p)
        if found:
            vlog("# Found prerequisite", p, "at", found)
        else:
            print "WARNING: Did not find prerequisite tool: "+p

def cleanup_exit():
    if verbose:
        print "# Cleaning up HGTMP", HGTMP
    shutil.rmtree(HGTMP, True)

def use_correct_python():
    # some tests run python interpreter. they must use same
    # interpreter we use or bad things will happen.
    exedir, exename = os.path.split(sys.executable)
    if exename == 'python':
        path = find_program('python')
        if os.path.dirname(path) == exedir:
            return
    vlog('# Making python executable in test path use correct Python')
    my_python = os.path.join(BINDIR, 'python')
    try:
        os.symlink(sys.executable, my_python)
    except AttributeError:
        # windows fallback
        shutil.copyfile(sys.executable, my_python)
        shutil.copymode(sys.executable, my_python)

def install_hg():
    global python
    vlog("# Performing temporary installation of HG")
    installerrs = os.path.join("tests", "install.err")

    # Run installer in hg root
    os.chdir(os.path.join(os.path.dirname(sys.argv[0]), '..'))
    cmd = ('%s setup.py clean --all'
           ' install --force --home="%s" --install-lib="%s"'
           ' --install-scripts="%s" >%s 2>&1'
           % (sys.executable, INST, PYTHONDIR, BINDIR, installerrs))
    vlog("# Running", cmd)
    if os.system(cmd) == 0:
        if not verbose:
            os.remove(installerrs)
    else:
        f = open(installerrs)
        for line in f:
            print line,
        f.close()
        sys.exit(1)
    os.chdir(TESTDIR)

    os.environ["PATH"] = "%s%s%s" % (BINDIR, os.pathsep, os.environ["PATH"])

    pydir = os.pathsep.join([PYTHONDIR, TESTDIR])
    pythonpath = os.environ.get("PYTHONPATH")
    if pythonpath:
        pythonpath = pydir + os.pathsep + pythonpath
    else:
        pythonpath = pydir
    os.environ["PYTHONPATH"] = pythonpath

    use_correct_python()

    if coverage:
        vlog("# Installing coverage wrapper")
        os.environ['COVERAGE_FILE'] = COVERAGE_FILE
        if os.path.exists(COVERAGE_FILE):
            os.unlink(COVERAGE_FILE)
        # Create a wrapper script to invoke hg via coverage.py
        os.rename(os.path.join(BINDIR, "hg"), os.path.join(BINDIR, "_hg.py"))
        f = open(os.path.join(BINDIR, 'hg'), 'w')
        f.write('#!' + sys.executable + '\n')
        f.write('import sys, os; os.execv(sys.executable, [sys.executable, '
                '"%s", "-x", "%s"] + sys.argv[1:])\n' %
                (os.path.join(TESTDIR, 'coverage.py'),
                 os.path.join(BINDIR, '_hg.py')))
        f.close()
        os.chmod(os.path.join(BINDIR, 'hg'), 0700)
        python = '"%s" "%s" -x' % (sys.executable,
                                   os.path.join(TESTDIR,'coverage.py'))

def output_coverage():
    vlog("# Producing coverage report")
    omit = [BINDIR, TESTDIR, PYTHONDIR]
    if not options.cover_stdlib:
        # Exclude as system paths (ignoring empty strings seen on win)
        omit += [x for x in sys.path if x != '']
    omit = ','.join(omit)
    os.chdir(PYTHONDIR)
    cmd = '"%s" "%s" -i -r "--omit=%s"' % (
        sys.executable, os.path.join(TESTDIR, 'coverage.py'), omit)
    vlog("# Running: "+cmd)
    os.system(cmd)
    if options.annotate:
        adir = os.path.join(TESTDIR, 'annotated')
        if not os.path.isdir(adir):
            os.mkdir(adir)
        cmd = '"%s" "%s" -i -a "--directory=%s" "--omit=%s"' % (
            sys.executable, os.path.join(TESTDIR, 'coverage.py'),
            adir, omit)
        vlog("# Running: "+cmd)
        os.system(cmd)

class Timeout(Exception):
    pass

def alarmed(signum, frame):
    raise Timeout

def run(cmd):
    """Run command in a sub-process, capturing the output (stdout and stderr).
    Return the exist code, and output."""
    # TODO: Use subprocess.Popen if we're running on Python 2.4
    if os.name == 'nt':
        tochild, fromchild = os.popen4(cmd)
        tochild.close()
        output = fromchild.read()
        ret = fromchild.close()
        if ret == None:
            ret = 0
    else:
        proc = popen2.Popen4(cmd)
        try:
            output = ''
            proc.tochild.close()
            output = proc.fromchild.read()
            ret = proc.wait()
            if os.WIFEXITED(ret):
                ret = os.WEXITSTATUS(ret)
        except Timeout:
            vlog('# Process %d timed out - killing it' % proc.pid)
            os.kill(proc.pid, signal.SIGTERM)
            ret = proc.wait()
            if ret == 0:
                ret = signal.SIGTERM << 8
            output += ("\n### Abort: timeout after %d seconds.\n"
                       % options.timeout)
    return ret, splitnewlines(output)

def run_one(test, skips):
    '''tristate output:
    None -> skipped
    True -> passed
    False -> failed'''

    def skip(msg):
        if not verbose:
            skips.append((test, msg))
            sys.stdout.write('s')
            sys.stdout.flush()
        else:
            print "\nSkipping %s: %s" % (test, msg)
        return None

    vlog("# Test", test)

    # create a fresh hgrc
    hgrc = file(HGRCPATH, 'w+')
    hgrc.write('[ui]\n')
    hgrc.write('slash = True\n')
    hgrc.close()

    err = os.path.join(TESTDIR, test+".err")
    ref = os.path.join(TESTDIR, test+".out")
    testpath = os.path.join(TESTDIR, test)

    if os.path.exists(err):
        os.remove(err)       # Remove any previous output files

    # Make a tmp subdirectory to work in
    tmpd = os.path.join(HGTMP, test)
    os.mkdir(tmpd)
    os.chdir(tmpd)

    try:
        tf = open(testpath)
        firstline = tf.readline().rstrip()
        tf.close()
    except:
        firstline = ''
    lctest = test.lower()

    if lctest.endswith('.py') or firstline == '#!/usr/bin/env python':
        cmd = '%s "%s"' % (python, testpath)
    elif lctest.endswith('.bat'):
        # do not run batch scripts on non-windows
        if os.name != 'nt':
            return skip("batch script")
        # To reliably get the error code from batch files on WinXP,
        # the "cmd /c call" prefix is needed. Grrr
        cmd = 'cmd /c call "%s"' % testpath
    else:
        # do not run shell scripts on windows
        if os.name == 'nt':
            return skip("shell script")
        # do not try to run non-executable programs
        if not os.access(testpath, os.X_OK):
            return skip("not executable")
        cmd = '"%s"' % testpath

    if options.timeout > 0:
        signal.alarm(options.timeout)

    vlog("# Running", cmd)
    ret, out = run(cmd)
    vlog("# Ret was:", ret)

    if options.timeout > 0:
        signal.alarm(0)

    skipped = (ret == SKIPPED_STATUS)
    diffret = 0
    # If reference output file exists, check test output against it
    if os.path.exists(ref):
        f = open(ref, "r")
        ref_out = splitnewlines(f.read())
        f.close()
    else:
        ref_out = []
    if not skipped and out != ref_out:
        diffret = 1
        print "\nERROR: %s output changed" % (test)
        show_diff(ref_out, out)
    if skipped:
        missing = extract_missing_features(out)
        if not missing:
            missing = ['irrelevant']
        skip(missing[-1])
    elif ret:
        print "\nERROR: %s failed with error code %d" % (test, ret)
    elif diffret:
        ret = diffret

    if not verbose:
        sys.stdout.write('.')
        sys.stdout.flush()

    if ret != 0 and not skipped:
        # Save errors to a file for diagnosis
        f = open(err, "wb")
        for line in out:
            f.write(line)
        f.close()

    # Kill off any leftover daemon processes
    try:
        fp = file(DAEMON_PIDS)
        for line in fp:
            try:
                pid = int(line)
            except ValueError:
                continue
            try:
                os.kill(pid, 0)
                vlog('# Killing daemon process %d' % pid)
                os.kill(pid, signal.SIGTERM)
                time.sleep(0.25)
                os.kill(pid, 0)
                vlog('# Daemon process %d is stuck - really killing it' % pid)
                os.kill(pid, signal.SIGKILL)
            except OSError, err:
                if err.errno != errno.ESRCH:
                    raise
        fp.close()
        os.unlink(DAEMON_PIDS)
    except IOError:
        pass

    os.chdir(TESTDIR)
    shutil.rmtree(tmpd, True)
    if skipped:
        return None
    return ret == 0

if not options.child:
    os.umask(022)

    check_required_tools()

# Reset some environment variables to well-known values so that
# the tests produce repeatable output.
os.environ['LANG'] = os.environ['LC_ALL'] = 'C'
os.environ['TZ'] = 'GMT'

TESTDIR = os.environ["TESTDIR"] = os.getcwd()
HGTMP = os.environ['HGTMP'] = tempfile.mkdtemp('', 'hgtests.', options.tmpdir)
DAEMON_PIDS = None
HGRCPATH = None

os.environ["HGEDITOR"] = sys.executable + ' -c "import sys; sys.exit(0)"'
os.environ["HGMERGE"]  = ('python "%s" -L my -L other'
                          % os.path.join(TESTDIR, os.path.pardir,
                                         'contrib', 'simplemerge'))
os.environ["HGUSER"]   = "test"
os.environ["HGENCODING"] = "ascii"
os.environ["HGENCODINGMODE"] = "strict"
os.environ["HGPORT"] = str(options.port)
os.environ["HGPORT1"] = str(options.port + 1)
os.environ["HGPORT2"] = str(options.port + 2)

if options.with_hg:
    INST = options.with_hg
else:
    INST = os.path.join(HGTMP, "install")
BINDIR = os.path.join(INST, "bin")
PYTHONDIR = os.path.join(INST, "lib", "python")
COVERAGE_FILE = os.path.join(TESTDIR, ".coverage")

def run_children(tests):
    if not options.with_hg:
        install_hg()

    optcopy = dict(options.__dict__)
    optcopy['jobs'] = 1
    optcopy['with_hg'] = INST
    opts = []
    for opt, value in optcopy.iteritems():
        name = '--' + opt.replace('_', '-')
        if value is True:
            opts.append(name)
        elif value is not None:
            opts.append(name + '=' + str(value))

    tests.reverse()
    jobs = [[] for j in xrange(options.jobs)]
    while tests:
        for j in xrange(options.jobs):
            if not tests: break
            jobs[j].append(tests.pop())
    fps = {}
    for j in xrange(len(jobs)):
        job = jobs[j]
        if not job:
            continue
        rfd, wfd = os.pipe()
        childopts = ['--child=%d' % wfd, '--port=%d' % (options.port + j * 3)]
        cmdline = [python, sys.argv[0]] + opts + childopts + job
        vlog(' '.join(cmdline))
        fps[os.spawnvp(os.P_NOWAIT, cmdline[0], cmdline)] = os.fdopen(rfd, 'r')
        os.close(wfd)
    failures = 0
    tested, skipped, failed = 0, 0, 0
    skips = []
    while fps:
        pid, status = os.wait()
        fp = fps.pop(pid)
        l = fp.read().splitlines()
        test, skip, fail = map(int, l[:3])
        for s in l[3:]:
            skips.append(s.split(" ", 1))
        tested += test
        skipped += skip
        failed += fail
        vlog('pid %d exited, status %d' % (pid, status))
        failures |= status
    print
    for s in skips:
        print "Skipped %s: %s" % (s[0], s[1])
    print "# Ran %d tests, %d skipped, %d failed." % (
        tested, skipped, failed)
    sys.exit(failures != 0)

def run_tests(tests):
    global DAEMON_PIDS, HGRCPATH
    DAEMON_PIDS = os.environ["DAEMON_PIDS"] = os.path.join(HGTMP, 'daemon.pids')
    HGRCPATH = os.environ["HGRCPATH"] = os.path.join(HGTMP, '.hgrc')

    try:
        if not options.with_hg:
            install_hg()

        if options.timeout > 0:
            try:
                signal.signal(signal.SIGALRM, alarmed)
                vlog('# Running tests with %d-second timeout' %
                     options.timeout)
            except AttributeError:
                print 'WARNING: cannot run tests with timeouts'
                options.timeout = 0

        tested = 0
        failed = 0
        skipped = 0

        if options.restart:
            orig = list(tests)
            while tests:
                if os.path.exists(tests[0] + ".err"):
                    break
                tests.pop(0)
            if not tests:
                print "running all tests"
                tests = orig

        skips = []
        for test in tests:
            if options.retest and not os.path.exists(test + ".err"):
                skipped += 1
                continue
            ret = run_one(test, skips)
            if ret is None:
                skipped += 1
            elif not ret:
                if options.interactive:
                    print "Accept this change? [n] ",
                    answer = sys.stdin.readline().strip()
                    if answer.lower() in "y yes".split():
                        os.rename(test + ".err", test + ".out")
                        tested += 1
                        continue
                failed += 1
                if options.first:
                    break
            tested += 1

        if options.child:
            fp = os.fdopen(options.child, 'w')
            fp.write('%d\n%d\n%d\n' % (tested, skipped, failed))
            for s in skips:
                fp.write("%s %s\n" % s) 
            fp.close()
        else:
            print
            for s in skips:
                print "Skipped %s: %s" % s
            print "# Ran %d tests, %d skipped, %d failed." % (
                tested, skipped, failed)

        if coverage:
            output_coverage()
    except KeyboardInterrupt:
        failed = True
        print "\ninterrupted!"

    if failed:
        sys.exit(1)

if len(args) == 0:
    args = os.listdir(".")
    args.sort()

tests = []
for test in args:
    if (test.startswith("test-") and '~' not in test and
        ('.' not in test or test.endswith('.py') or
         test.endswith('.bat'))):
        tests.append(test)

vlog("# Using TESTDIR", TESTDIR)
vlog("# Using HGTMP", HGTMP)

try:
    if len(tests) > 1 and options.jobs > 1:
        run_children(tests)
    else:
        run_tests(tests)
finally:
    cleanup_exit()