1# 2# This program is free software; you can redistribute it and/or modify 3# it under the terms of the GNU General Public License version 2 4# as published by the Free Software Foundation. 5# 6# This program is distributed in the hope that it will be useful, 7# but WITHOUT ANY WARRANTY; without even the implied warranty of 8# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 9# GNU General Public License for more details. 10# 11# You should have received a copy of the GNU General Public License 12# along with this program; if not, write to the Free Software 13# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 14# 15 16# 17# Copyright 2009 Sun Microsystems, Inc. All rights reserved. 18# Use is subject to license terms. 19# 20 21''' 22Deal with Mercurial versioning. 23 24At a basic level, code to verify that the version of Mercurial in use 25is suitable for use with Cadmium, and compare that version for the 26sake of adapting to Mercurial API changes. 27''' 28 29# 30# It is important that this module rely on as little of Mercurial as 31# is possible. 32# 33 34# 35# Mercurial >= 1.2 has util.version(), prior versions 36# version.get_version() We discover which to use this way, rather than 37# via ImportError to account for mercurial.demandimport delaying the 38# ImportError exception. 39# 40from mercurial import util 41if hasattr(util, 'version'): 42 hg_version = util.version 43else: 44 from mercurial import version 45 hg_version = version.get_version 46 47 48class VersionMismatch(Exception): 49 "Exception used to indicate a mismatch between SCM tools and Mercurial" 50 pass 51 52# 53# List of versions that are explicitly acceptable to us 54# 55GOOD_VERSIONS = ['1.1.2', '1.3.1'] 56 57 58def check_version(): 59 '''Check that we're running on a suitable version of Mercurial''' 60 61 def versionstring(versions): 62 '''return the list, versions, as a vaguely grammatical string''' 63 if len(versions) > 1: 64 return "%s or %s" % (', '.join(versions[0:-1]), versions[-1]) 65 else: 66 return versions[0] 67 68 if hg_version() not in GOOD_VERSIONS: 69 raise VersionMismatch("Scm expects Mercurial version %s, " 70 "actual version is %s." % 71 (versionstring(GOOD_VERSIONS), 72 hg_version())) 73 74 75def _split_version(ver): 76 '''Return the Mercurial version as a list [MAJOR, MINOR, MICRO], 77 if this is not a released Mercurial return None.''' 78 79 try: 80 l = map(int, ver.split('.')) 81 # If there's only one element, it's not really a tagged version 82 if len(l) <= 1: 83 return None 84 else: 85 return l 86 except ValueError: 87 return None 88 89 90def at_least(desired): 91 '''Return boolean indicating if the running version is greater 92 than or equal to, the version specified by major, minor, micro''' 93 94 hgver = _split_version(hg_version()) 95 desired = map(int, desired.split('.')) 96 97 # 98 # If _split_version() returns None, we're running on a Mercurial that 99 # has not been tagged as a release. We assume this to be newer 100 # than any released version. 101 # 102 if hgver == None: 103 return True 104 105 # Pad our versions to the same overall length, appending 0's 106 while len(hgver) < len(desired): 107 hgver.append(0) 108 while len(desired) < len(hgver): 109 desired.append(0) 110 111 for real, req in zip(hgver, desired): 112 if real != req: 113 return real > req 114 115 return True 116