def get_proc(cmd, asynchronous=False):
if asynchronous:
proc = asyncprocess.Popen(cmd, shell=True, stdout=asyncprocess.PIPE, stderr=asyncprocess.STDOUT,
stdin=asyncprocess.PIPE, close_fds=True, executable='/bin/bash')
else:
proc = subprocess.Popen(cmd, shell=True, stdout=subprocess.PIPE, stderr=subprocess.STDOUT,
stdin=subprocess.PIPE, close_fds=True, executable='/bin/bash')
return proc
def run_cmd_qa(cmd,
qa,
no_qa=None,
log_ok=True,
log_all=False,
simple=False,
regexp=True,
std_qa=None,
path=None,
maxhits=50,
trace=True):
"""
Run specified interactive command (in a subshell)
:param cmd: command to run
:param qa: dictionary which maps question to answers
:param no_qa: list of patters that are not questions
:param log_ok: only run output/exit code for failing commands (exit code non-zero)
:param log_all: always log command output and exit code
:param simple: if True, just return True/False to indicate success, else return a tuple: (output, exit_code)
:param regex: regex used to check the output for errors; if True it will use the default (see parse_log_for_error)
:param std_qa: dictionary which maps question regex patterns to answers
:param path: path to execute the command is; current working directory is used if unspecified
:param maxhits: maximum number of cycles (seconds) without being able to find a known question
:param trace: print command being executed as part of trace output
"""
cwd = os.getcwd()
if log_all or (trace and build_option('trace')):
# collect output of running command in temporary log file, if desired
fd, cmd_log_fn = tempfile.mkstemp(suffix='.log',
prefix='easybuild-run_cmd_qa-')
os.close(fd)
try:
cmd_log = open(cmd_log_fn, 'w')
except IOError as err:
raise EasyBuildError(
"Failed to open temporary log file for output of interactive command: %s",
err)
_log.debug('run_cmd_qa: Output of "%s" will be logged to %s' %
(cmd, cmd_log_fn))
else:
cmd_log_fn, cmd_log = None, None
start_time = datetime.now()
if trace:
trace_txt = "running interactive command:\n"
trace_txt += "\t[started at: %s]\n" % start_time.strftime(
'%Y-%m-%d %H:%M:%S')
trace_txt += "\t[working dir: %s]\n" % (path or os.getcwd())
trace_txt += "\t[output logged in %s]\n" % cmd_log_fn
trace_msg(trace_txt + '\t' + cmd.strip())
# early exit in 'dry run' mode, after printing the command that would be run
if build_option('extended_dry_run'):
if path is None:
path = cwd
dry_run_msg(" running interactive command \"%s\"" % cmd,
silent=build_option('silent'))
dry_run_msg(" (in %s)" % path, silent=build_option('silent'))
if simple:
return True
else:
# output, exit code
return ('', 0)
try:
if path:
os.chdir(path)
_log.debug("run_cmd_qa: running cmd %s (in %s)" % (cmd, os.getcwd()))
except OSError as err:
_log.warning("Failed to change to %s: %s" % (path, err))
_log.info("running cmd %s in non-existing directory, might fail!" %
cmd)
# Part 1: process the QandA dictionary
# given initial set of Q and A (in dict), return dict of reg. exp. and A
#
# make regular expression that matches the string with
# - replace whitespace
# - replace newline
def escape_special(string):
return re.sub(r"([\+\?\(\)\[\]\*\.\\\$])", r"\\\1", string)
split = r'[\s\n]+'
regSplit = re.compile(r"" + split)
def process_QA(q, a_s):
splitq = [escape_special(x) for x in regSplit.split(q)]
regQtxt = split.join(splitq) + split.rstrip('+') + "*$"
# add optional split at the end
for i in [idx for idx, a in enumerate(a_s) if not a.endswith('\n')]:
a_s[i] += '\n'
regQ = re.compile(r"" + regQtxt)
if regQ.search(q):
return (a_s, regQ)
else:
raise EasyBuildError(
"runqanda: Question %s converted in %s does not match itself",
q, regQtxt)
def check_answers_list(answers):
"""Make sure we have a list of answers (as strings)."""
if isinstance(answers, string_type):
answers = [answers]
elif not isinstance(answers, list):
raise EasyBuildError(
"Invalid type for answer on %s, no string or list: %s (%s)",
question, type(answers), answers)
# list is manipulated when answering matching question, so return a copy
return answers[:]
new_qa = {}
_log.debug("new_qa: ")
for question, answers in qa.items():
answers = check_answers_list(answers)
(answers, regQ) = process_QA(question, answers)
new_qa[regQ] = answers
_log.debug("new_qa[%s]: %s" % (regQ.pattern, new_qa[regQ]))
new_std_qa = {}
if std_qa:
for question, answers in std_qa.items():
regQ = re.compile(r"" + question + r"[\s\n]*$")
answers = check_answers_list(answers)
for i in [
idx for idx, a in enumerate(answers)
if not a.endswith('\n')
]:
answers[i] += '\n'
new_std_qa[regQ] = answers
_log.debug("new_std_qa[%s]: %s" % (regQ.pattern, new_std_qa[regQ]))
new_no_qa = []
if no_qa:
# simple statements, can contain wildcards
new_no_qa = [re.compile(r"" + x + r"[\s\n]*$") for x in no_qa]
_log.debug("New noQandA list is: %s" % [x.pattern for x in new_no_qa])
# Part 2: Run the command and answer questions
# - this needs asynchronous stdout
# # Log command output
if cmd_log:
cmd_log.write("# output for interactive command: %s\n\n" % cmd)
try:
proc = asyncprocess.Popen(cmd,
shell=True,
stdout=asyncprocess.PIPE,
stderr=asyncprocess.STDOUT,
stdin=asyncprocess.PIPE,
close_fds=True,
executable='/bin/bash')
except OSError as err:
raise EasyBuildError("run_cmd_qa init cmd %s failed:%s", cmd, err)
ec = proc.poll()
stdout_err = ''
old_len_out = -1
hit_count = 0
while ec is None:
# need to read from time to time.
# - otherwise the stdout/stderr buffer gets filled and it all stops working
try:
out = get_output_from_process(proc, asynchronous=True)
if cmd_log:
cmd_log.write(out)
stdout_err += out
# recv_some used by get_output_from_process for getting asynchronous output may throw exception
except (IOError, Exception) as err:
_log.debug("run_cmd_qa cmd %s: read failed: %s", cmd, err)
out = None
hit = False
for question, answers in new_qa.items():
res = question.search(stdout_err)
if out and res:
fa = answers[0] % res.groupdict()
# cycle through list of answers
last_answer = answers.pop(0)
answers.append(last_answer)
_log.debug("List of answers for question %s after cycling: %s",
question.pattern, answers)
_log.debug("run_cmd_qa answer %s question %s out %s", fa,
question.pattern, stdout_err[-50:])
asyncprocess.send_all(proc, fa)
hit = True
break
if not hit:
for question, answers in new_std_qa.items():
res = question.search(stdout_err)
if out and res:
fa = answers[0] % res.groupdict()
# cycle through list of answers
last_answer = answers.pop(0)
answers.append(last_answer)
_log.debug(
"List of answers for question %s after cycling: %s",
question.pattern, answers)
_log.debug("run_cmd_qa answer %s std question %s out %s",
fa, question.pattern, stdout_err[-50:])
asyncprocess.send_all(proc, fa)
hit = True
break
if not hit:
if len(stdout_err) > old_len_out:
old_len_out = len(stdout_err)
else:
noqa = False
for r in new_no_qa:
if r.search(stdout_err):
_log.debug("runqanda: noQandA found for out %s",
stdout_err[-50:])
noqa = True
if not noqa:
hit_count += 1
else:
hit_count = 0
else:
hit_count = 0
if hit_count > maxhits:
# explicitly kill the child process before exiting
try:
os.killpg(proc.pid, signal.SIGKILL)
os.kill(proc.pid, signal.SIGKILL)
except OSError as err:
_log.debug(
"run_cmd_qa exception caught when killing child process: %s",
err)
_log.debug("run_cmd_qa: full stdouterr: %s", stdout_err)
raise EasyBuildError(
"run_cmd_qa: cmd %s : Max nohits %s reached: end of output %s",
cmd, maxhits, stdout_err[-500:])
# the sleep below is required to avoid exiting on unknown 'questions' too early (see above)
time.sleep(1)
ec = proc.poll()
# Process stopped. Read all remaining data
try:
if proc.stdout:
out = get_output_from_process(proc)
stdout_err += out
if cmd_log:
cmd_log.write(out)
cmd_log.close()
except IOError as err:
_log.debug("runqanda cmd %s: remaining data read failed: %s", cmd, err)
if trace:
trace_msg("interactive command completed: exit %s, ran in %s" %
(ec, time_str_since(start_time)))
try:
os.chdir(cwd)
except OSError as err:
raise EasyBuildError(
"Failed to return to %s after executing command: %s", cwd, err)
return parse_cmd_output(cmd, stdout_err, ec, simple, log_all, log_ok,
regexp)