scripts/tracetool.py

   1 #!/usr/bin/env python3
   2 # -*- coding: utf-8 -*-
   3
   4 """
   5 Command-line wrapper for the tracetool machinery.
   6 """
   7
   8 __author__     = "Lluís Vilanova <vilanova@ac.upc.edu>"
   9 __copyright__  = "Copyright 2012-2014, Lluís Vilanova <vilanova@ac.upc.edu>"
  10 __license__    = "GPL version 2 or (at your option) any later version"
  11
  12 __maintainer__ = "Stefan Hajnoczi"
  13 __email__      = "stefanha@redhat.com"
  14
  15
  16 import sys
  17 import getopt
  18
  19 from tracetool import error_write, out, out_open
  20 import tracetool.backend
  21 import tracetool.format
  22
  23
  24 _SCRIPT = ""
  25
  26 def error_opt(msg = None):
  27     if msg is not None:
  28         error_write("Error: " + msg + "\n")
  29
  30     backend_descr = "\n".join([ "    %-15s %s" % (n, d)
  31                                 for n,d in tracetool.backend.get_list() ])
  32     format_descr = "\n".join([ "    %-15s %s" % (n, d)
  33                                for n,d in tracetool.format.get_list() ])
  34     error_write("""\
  35 Usage: %(script)s --format=<format> --backends=<backends> [<options>] <trace-events> ... <output>
  36
  37 Backends:
  38 %(backends)s
  39
  40 Formats:
  41 %(formats)s
  42
  43 Options:
  44     --help                   This help message.
  45     --list-backends          Print list of available backends.
  46     --check-backends         Check if the given backend is valid.
  47     --binary <path>          Full path to QEMU binary.
  48     --target-type <type>     QEMU emulator target type ('system' or 'user').
  49     --target-name <name>     QEMU emulator target name.
  50     --group <name>           Name of the event group
  51     --probe-prefix <prefix>  Prefix for dtrace probe names
  52                              (default: qemu-<target-type>-<target-name>).\
  53 """ % {
  54             "script" : _SCRIPT,
  55             "backends" : backend_descr,
  56             "formats" : format_descr,
  57             })
  58
  59     if msg is None:
  60         sys.exit(0)
  61     else:
  62         sys.exit(1)
  63
  64 def main(args):
  65     global _SCRIPT
  66     _SCRIPT = args[0]
  67
  68     long_opts = ["backends=", "format=", "help", "list-backends",
  69                  "check-backends", "group="]
  70     long_opts += ["binary=", "target-type=", "target-name=", "probe-prefix="]
  71
  72     try:
  73         opts, args = getopt.getopt(args[1:], "", long_opts)
  74     except getopt.GetoptError as err:
  75         error_opt(str(err))
  76
  77     check_backends = False
  78     arg_backends = []
  79     arg_format = ""
  80     arg_group = None
  81     binary = None
  82     target_type = None
  83     target_name = None
  84     probe_prefix = None
  85     for opt, arg in opts:
  86         if opt == "--help":
  87             error_opt()
  88
  89         elif opt == "--backends":
  90             arg_backends = arg.split(",")
  91         elif opt == "--group":
  92             arg_group = arg
  93         elif opt == "--format":
  94             arg_format = arg
  95
  96         elif opt == "--list-backends":
  97             public_backends = tracetool.backend.get_list(only_public = True)
  98             out(", ".join([ b for b,_ in public_backends ]))
  99             sys.exit(0)
 100         elif opt == "--check-backends":
 101             check_backends = True
 102
 103         elif opt == "--binary":
 104             binary = arg
 105         elif opt == '--target-type':
 106             target_type = arg
 107         elif opt == '--target-name':
 108             target_name = arg
 109         elif opt == '--probe-prefix':
 110             probe_prefix = arg
 111
 112         else:
 113             error_opt("unhandled option: %s" % opt)
 114
 115     if len(arg_backends) == 0:
 116         error_opt("no backends specified")
 117
 118     if check_backends:
 119         for backend in arg_backends:
 120             if not tracetool.backend.exists(backend):
 121                 sys.exit(1)
 122         sys.exit(0)
 123
 124     if arg_group is None:
 125         error_opt("group name is required")
 126
 127     if arg_format == "stap":
 128         if binary is None:
 129             error_opt("--binary is required for SystemTAP tapset generator")
 130         if probe_prefix is None and target_type is None:
 131             error_opt("--target-type is required for SystemTAP tapset generator")
 132         if probe_prefix is None and target_name is None:
 133             error_opt("--target-name is required for SystemTAP tapset generator")
 134
 135         if probe_prefix is None:
 136             probe_prefix = ".".join(["qemu", target_type, target_name])
 137
 138     if len(args) < 2:
 139         error_opt("missing trace-events and output filepaths")
 140     events = []
 141     for arg in args[:-1]:
 142         with open(arg, "r") as fh:
 143             events.extend(tracetool.read_events(fh, arg))
 144
 145     out_open(args[-1])
 146
 147     try:
 148         tracetool.generate(events, arg_group, arg_format, arg_backends,
 149                            binary=binary, probe_prefix=probe_prefix)
 150     except tracetool.TracetoolError as e:
 151         error_opt(str(e))
 152
 153 if __name__ == "__main__":
 154     main(sys.argv)