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# vim: set fileencoding=utf-8 :
#
# (C) 2012 Guido Günther <agx@sigxcpu.org>
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, please see
# <http://www.gnu.org/licenses/>
"""Interface to uscan"""
import os, re, subprocess
class UscanError(Exception):
pass
class Uscan(object):
cmd = '/usr/bin/uscan'
def __init__(self, dir='.'):
self._uptodate = False
self._tarball = None
self._dir = os.path.abspath(dir)
@property
def uptodate(self):
return self._uptodate
@property
def tarball(self):
return self._tarball
def _parse(self, out):
r"""
Parse the uscan output return and update the object's properties
@param out: uscan output
@type out: string
>>> u = Uscan('http://example.com/')
>>> u._parse('<target>virt-viewer_0.4.0.orig.tar.gz</target>')
>>> u.tarball
'../virt-viewer_0.4.0.orig.tar.gz'
>>> u.uptodate
False
>>> u._parse('')
Traceback (most recent call last):
...
UscanError: Couldn't find 'upstream-url' in uscan output
"""
source = None
self._uptodate = False
# Check if uscan downloaded something
for row in out.split("\n"):
# uscan >= 2.10.70 has a target element:
m = re.match(r"<target>(.*)</target>", row)
if m:
source = '../%s' % m.group(1)
break
elif row.startswith('<messages>'):
m = re.match(r".*symlinked ([^\s]+) to it", row)
if m:
source = "../%s" % m.group(1)
break
m = re.match(r"Successfully downloaded updated package "
"([^<]+)", row)
if m:
source = "../%s" % m.group(1)
break
# Try to determine the already downloaded sources name
else:
d = {}
try:
for row in out.split("\n"):
for n in ('package',
'upstream-version',
'upstream-url'):
m = re.match("<%s>(.*)</%s>" % (n,n), row)
if m:
d[n] = m.group(1)
d["ext"] = os.path.splitext(d['upstream-url'])[1]
# We want the name of the orig tarball if possible
source = ("../%(package)s_%(upstream-version)s."
"orig.tar%(ext)s" % d)
# Fall back to the upstream source name otherwise
if not os.path.exists(source):
source = "../%s" % d['upstream-url'].rsplit('/',1)[1]
if not os.path.exists(source):
raise UscanError("Couldn't find tarball at '%s'" %
source)
except KeyError as e:
raise UscanError("Couldn't find '%s' in uscan output" %
e.args[0])
self._tarball = source
def _parse_uptodate(self, out):
"""
Check if the uscan reports that we're up to date.
@param out: uscan output
@type out: string
>>> u = Uscan('http://example.com/')
>>> u._parse_uptodate('<status>up to date</status>')
>>> u.tarball
>>> u.uptodate
True
>>> u._parse_uptodate('')
>>> u.tarball
>>> u.uptodate
False
"""
if "<status>up to date</status>" in out:
self._uptodate = True
else:
self._uptodate = False
def _raise_error(self, out):
r"""
Parse the uscan output for errors and warnings and raise
a L{UscanError} exception based on this. If no error detail
is found a generic error message is used.
@param out: uscan output
@type out: string
@raises UscanError: exception raised
>>> u = Uscan('http://example.com/')
>>> u._raise_error("<warnings>uscan warning: "
... "In watchfile debian/watch, reading webpage\n"
... "http://a.b/ failed: 500 Cant connect "
... "to example.com:80 (Bad hostname)</warnings>")
Traceback (most recent call last):
...
UscanError: Uscan failed: uscan warning: In watchfile debian/watch, reading webpage
http://a.b/ failed: 500 Cant connect to example.com:80 (Bad hostname)
>>> u._raise_error("<errors>uscan: Can't use --verbose if "
... "you're using --dehs!</errors>")
Traceback (most recent call last):
...
UscanError: Uscan failed: uscan: Can't use --verbose if you're using --dehs!
>>> u = u._raise_error('')
Traceback (most recent call last):
...
UscanError: Uscan failed - debug by running 'uscan --verbose'
"""
msg = None
for n in ('errors', 'warnings'):
m = re.search("<%s>(.*)</%s>" % (n,n), out, re.DOTALL)
if m:
msg = "Uscan failed: %s" % m.group(1)
break
if not msg:
msg = "Uscan failed - debug by running 'uscan --verbose'"
raise UscanError(msg)
def scan(self, destdir='..'):
"""Invoke uscan to fetch a new upstream version"""
p = subprocess.Popen(['uscan', '--symlink', '--destdir=%s' % destdir,
'--dehs'],
cwd=self._dir,
stdout=subprocess.PIPE)
out = p.communicate()[0]
# uscan exits with 1 in case of uptodate and when an error occurred.
# Don't fail in the uptodate case:
self._parse_uptodate(out)
if not self.uptodate:
if p.returncode:
self._raise_error(out)
else:
self._parse(out)
# vim:et:ts=4:sw=4:et:sts=4:ai:set list listchars=tab\:»·,trail\:·:
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