1#!/usr/bin/env python 

2# -*- coding: utf-8 -*- 

3# This file is part of Xpra. 

4# Copyright (C) 2014-2019 Antoine Martin <antoine@xpra.org> 

5# Xpra is released under the terms of the GNU GPL v2, or, at your option, any 

6# later version. See the file COPYING for details. 

7 

8import os 

9 

10from xpra.util import prettify_plug_name 

11from xpra.os_util import find_lib, find_lib_ldconfig, LINUX, POSIX 

12from xpra.version_util import XPRA_VERSION 

13from xpra.log import Logger 

14 

15log = Logger("x11", "server", "util") 

16 

17fakeXinerama_config_files = [ 

18 #the new fakexinerama file: 

19 os.path.expanduser("~/.%s-fakexinerama" % os.environ.get("DISPLAY")), 

20 #compat file for "old" version found on github: 

21 os.path.expanduser("~/.fakexinerama"), 

22 ] 

23 

24def find_libfakeXinerama(): 

25 libname = "fakeXinerama" 

26 try: 

27 from ctypes.util import find_library 

28 flibname = find_library("fakeXinerama") 

29 if flibname: 

30 libname = flibname 

31 except Exception: 

32 pass 

33 if POSIX: 

34 for lib_dir in os.environ.get("LD_LIBRARY_PATH", "/usr/lib").split(os.pathsep): 

35 lib_path = os.path.join(lib_dir, libname) 

36 if not os.path.exists(lib_dir): 

37 continue 

38 if os.path.exists(lib_path) and os.path.isfile(lib_path): 

39 return lib_path 

40 if LINUX: 

41 try: 

42 libpath = find_lib_ldconfig("fakeXinerama") 

43 if libpath: 

44 return libpath 

45 except Exception as e: 

46 log("find_libfakeXinerama()", exc_info=True) 

47 log.error("Error: cannot launch ldconfig -p to locate libfakeXinerama:") 

48 log.error(" %s", e) 

49 return find_lib(libname) 

50 

51current_xinerama_config = None 

52 

53def save_fakeXinerama_config(supported=True, source="", ss=()): 

54 """ returns True if the fakexinerama config was modified """ 

55 global current_xinerama_config 

56 def delfile(msg): 

57 global current_xinerama_config 

58 if msg: 

59 log.warn(msg) 

60 cleanup_fakeXinerama() 

61 oldconf = current_xinerama_config 

62 current_xinerama_config = None 

63 return oldconf is not None 

64 if not supported: 

65 return delfile(None) 

66 if not ss: 

67 return delfile("cannot save fake xinerama settings: no display found") 

68 if len(ss)>1: 

69 return delfile("cannot save fake xinerama settings: more than one display found") 

70 display_info = ss[0] 

71 if len(display_info)==2 and isinstance(display_info[0], int) and isinstance(display_info[1], int): 

72 #just WxH, not enough display information 

73 return delfile("cannot save fake xinerama settings: missing display data from client %s" % source) 

74 if len(display_info)<10: 

75 return delfile("cannot save fake xinerama settings: incomplete display data from client %s" % source) 

76 #display_name, width, height, width_mm, height_mm, \ 

77 #monitors, work_x, work_y, work_width, work_height = s[:11] 

78 monitors = display_info[5] 

79 if len(monitors)==0: 

80 return delfile("cannot save fake xinerama settings: no monitors!") 

81 if len(monitors)>=10: 

82 return delfile("cannot save fake xinerama settings: too many monitors! (%s)" % len(monitors)) 

83 #generate the file data: 

84 data = ["# file generated by xpra %s for display %s" % (XPRA_VERSION, os.environ.get("DISPLAY")), 

85 "# %s monitors:" % len(monitors), 

86 "%s" % len(monitors)] 

87 #the new config (numeric values only) 

88 config = [len(monitors)] 

89 for i, m in enumerate(monitors): 

90 if len(m)<7: 

91 return delfile("cannot save fake xinerama settings: incomplete monitor data for monitor: %s" % (m, )) 

92 plug_name, x, y, width, height, wmm, hmm = m[:7] 

93 data.append("# %s (%smm x %smm)" % (prettify_plug_name(plug_name, "monitor %s" % i), wmm, hmm)) 

94 data.append("%s %s %s %s" % (x, y, width, height)) 

95 config.append((x, y, width, height)) 

96 if current_xinerama_config==config: 

97 #we assume that no other process is going to overwrite the deprecated .fakexinerama 

98 log("fake xinerama config unchanged") 

99 return False 

100 log("fake xinerama config changed:") 

101 log(" old=%s", current_xinerama_config) 

102 log(" new=%s", config) 

103 current_xinerama_config = config 

104 data.append("") 

105 contents = "\n".join(data) 

106 for filename in fakeXinerama_config_files: 

107 try: 

108 with open(filename, 'wb') as f: 

109 f.write(contents.encode("utf8")) 

110 except Exception as e: 

111 log("writing to '%s'", filename, exc_info=True) 

112 log.warn("Error writing fake xinerama file '%s':", filename) 

113 log.warn(" %s", e) 

114 log("saved %s monitors to fake xinerama files: %s", len(monitors), fakeXinerama_config_files) 

115 return True 

116 

117def cleanup_fakeXinerama(): 

118 for f in fakeXinerama_config_files: 

119 try: 

120 if os.path.exists(f): 

121 log("cleanup_fakexinerama() deleting fake xinerama file '%s'", f) 

122 os.unlink(f) 

123 except Exception as e: 

124 log.error("Error: failed to delete fakexinerama config file") 

125 log.error(" '%s': %s", f, e) 

126 

127 

128def main(): 

129 print("libfakeXinerama=%s" % find_libfakeXinerama()) 

130 

131if __name__ == "__main__": 

132 main()