1 | #! /usr/bin/env python |
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2 | # -*- coding: ISO-8859-15 -*- |
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3 | |
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4 | # CupsOfTee : Tee for CUPS |
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5 | # |
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6 | # (c) 2005 Jerome Alet <alet@librelogiciel.com> |
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7 | # This program is free software; you can redistribute it and/or modify |
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8 | # it under the terms of the GNU General Public License as published by |
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9 | # the Free Software Foundation; either version 2 of the License, or |
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10 | # (at your option) any later version. |
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11 | # |
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12 | # This program is distributed in the hope that it will be useful, |
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13 | # but WITHOUT ANY WARRANTY; without even the implied warranty of |
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14 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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15 | # GNU General Public License for more details. |
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16 | # |
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17 | # You should have received a copy of the GNU General Public License |
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18 | # along with this program; if not, write to the Free Software |
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19 | # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA. |
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20 | # |
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21 | # $Id$ |
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22 | # |
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23 | # |
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24 | |
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25 | import sys |
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26 | import os |
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27 | import errno |
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28 | import cStringIO |
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29 | import shlex |
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30 | import tempfile |
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31 | |
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32 | class CupsBackend : |
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33 | """Base class for tools with no database access.""" |
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34 | def __init__(self) : |
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35 | """Initializes the CUPS backend wrapper.""" |
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36 | self.debug = 1 |
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37 | |
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38 | def discoverOtherBackends(self) : |
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39 | """Discovers the other CUPS backends. |
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40 | |
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41 | Executes each existing backend in turn in device enumeration mode. |
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42 | Returns the list of available backends. |
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43 | """ |
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44 | # Unfortunately this method can't output any debug information |
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45 | # to stdout or stderr, else CUPS considers that the device is |
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46 | # not available. |
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47 | available = [] |
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48 | (directory, myname) = os.path.split(sys.argv[0]) |
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49 | tmpdir = tempfile.gettempdir() |
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50 | lockfilename = os.path.join(tmpdir, "%s..LCK" % myname) |
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51 | if os.path.exists(lockfilename) : |
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52 | lockfile = open(lockfilename, "r") |
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53 | pid = int(lockfile.read()) |
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54 | lockfile.close() |
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55 | try : |
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56 | # see if the pid contained in the lock file is still running |
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57 | os.kill(pid, 0) |
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58 | except OSError, e : |
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59 | if e.errno != errno.EPERM : |
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60 | # process doesn't exist anymore |
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61 | os.remove(lockfilename) |
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62 | |
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63 | if not os.path.exists(lockfilename) : |
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64 | lockfile = open(lockfilename, "w") |
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65 | lockfile.write("%i" % os.getpid()) |
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66 | lockfile.close() |
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67 | allbackends = [ os.path.join(directory, b) \ |
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68 | for b in os.listdir(directory) |
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69 | if os.access(os.path.join(directory, b), os.X_OK) \ |
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70 | and (b != myname)] |
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71 | for backend in allbackends : |
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72 | answer = os.popen(backend, "r") |
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73 | try : |
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74 | devices = [line.strip() for line in answer.readlines()] |
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75 | except : |
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76 | devices = [] |
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77 | status = answer.close() |
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78 | if status is None : |
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79 | for d in devices : |
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80 | # each line is of the form : |
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81 | # 'xxxx xxxx "xxxx xxx" "xxxx xxx"' |
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82 | # so we have to decompose it carefully |
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83 | fdevice = cStringIO.StringIO(d) |
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84 | tokenizer = shlex.shlex(fdevice) |
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85 | tokenizer.wordchars = tokenizer.wordchars + \ |
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86 | r".:,?!~/\_$*-+={}[]()#" |
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87 | arguments = [] |
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88 | while 1 : |
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89 | token = tokenizer.get_token() |
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90 | if token : |
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91 | arguments.append(token) |
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92 | else : |
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93 | break |
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94 | fdevice.close() |
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95 | try : |
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96 | (devicetype, device, name, fullname) = arguments |
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97 | except ValueError : |
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98 | pass # ignore this 'bizarre' device |
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99 | else : |
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100 | if name.startswith('"') and name.endswith('"') : |
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101 | name = name[1:-1] |
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102 | if fullname.startswith('"') and fullname.endswith('"') : |
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103 | fullname = fullname[1:-1] |
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104 | available.append('%s cupsoftee:%s "CupsOfTee+%s" "CupsOfTee managed %s"' \ |
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105 | % (devicetype, device, name, fullname)) |
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106 | os.remove(lockfilename) |
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107 | return available |
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108 | |
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109 | def fakePrint(self) : |
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110 | """Fakes to print the job.""" |
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111 | if os.environ.has_key("CUPS_SERVERROOT") and os.path.isdir(os.environ.get("CUPS_SERVERROOT", "")) : |
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112 | # Either the job's datas are on our stdin, or in a file |
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113 | if len(sys.argv) == 7 : |
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114 | self.InputFile = sys.argv[6] |
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115 | else : |
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116 | self.InputFile = None |
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117 | |
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118 | # check that the DEVICE_URI environment variable's value is |
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119 | # prefixed with "cupsoftee:" otherwise don't touch it. |
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120 | # If this is the case, we have to remove the prefix from |
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121 | # the environment before launching the real backend in cupspykota |
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122 | device_uri = os.environ.get("DEVICE_URI", "") |
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123 | if device_uri.startswith("cupspykota:") : |
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124 | fulldevice_uri = device_uri[:] |
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125 | device_uri = fulldevice_uri[len("cupspykota:"):] |
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126 | if device_uri.startswith("//") : # lpd (at least) |
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127 | device_uri = device_uri[2:] |
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128 | os.environ["DEVICE_URI"] = device_uri # TODO : side effect ! |
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129 | # TODO : check this for more complex urls than ipp://myprinter.dot.com:631/printers/lp |
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130 | try : |
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131 | (backend, destination) = device_uri.split(":", 1) |
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132 | except ValueError : |
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133 | raise PyKotaToolError, "Invalid DEVICE_URI : %s\n" % device_uri |
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134 | while destination.startswith("/") : |
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135 | destination = destination[1:] |
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136 | checkauth = destination.split("@", 1) |
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137 | if len(checkauth) == 2 : |
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138 | destination = checkauth[1] |
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139 | printerhostname = destination.split("/")[0].split(":")[0] |
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140 | return ("CUPS", \ |
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141 | printerhostname, \ |
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142 | os.environ.get("PRINTER"), \ |
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143 | sys.argv[2].strip(), \ |
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144 | sys.argv[1].strip(), \ |
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145 | inputfile, \ |
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146 | int(sys.argv[4].strip()), \ |
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147 | sys.argv[3], \ |
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148 | sys.argv[5], \ |
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149 | backend) |
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150 | |
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151 | def logDebug(self, message) : |
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152 | """Logs something to debug output if debug is enabled.""" |
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153 | if self.debug : |
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154 | sys.stderr.write("DEBUG: %s\n" % message) |
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155 | sys.stderr.flush() |
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156 | |
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157 | def logInfo(self, message, level="info") : |
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158 | """Logs a message to CUPS' error_log file.""" |
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159 | sys.stderr.write("%s: %s\n" % (level.upper(), message)) |
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160 | sys.stderr.flush() |
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161 | |
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162 | if __name__ == "__main__" : |
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163 | # This is a CUPS backend, we should act and die like a CUPS backend |
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164 | wrapper = CupsBackend() |
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165 | if len(sys.argv) == 1 : |
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166 | print "\n".join(wrapper.discoverOtherBackends()) |
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167 | sys.exit(0) |
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168 | elif len(sys.argv) not in (6, 7) : |
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169 | sys.stderr.write("ERROR: %s job-id user title copies options [file]\n"\ |
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170 | % sys.argv[0]) |
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171 | sys.exit(1) |
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172 | else : |
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173 | sys.stderr.write("ERROR: Not Yet !\n") |
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174 | sys.exit(1) |
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