/usr/lib/python3/dist-packages/apt/debfile.py is in python3-apt 0.8.8.2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#
# Author: Michael Vogt <michael.vogt@ubuntu.com>
#
# 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, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
# USA
"""Classes for working with locally available Debian packages."""
import apt
import apt_inst
import apt_pkg
import gzip
import os
import sys
from apt_pkg import gettext as _
from io import StringIO
class NoDebArchiveException(IOError):
"""Exception which is raised if a file is no Debian archive."""
class DebPackage(object):
"""A Debian Package (.deb file)."""
# Constants for comparing the local package file with the version
# in the cache
(VERSION_NONE,
VERSION_OUTDATED,
VERSION_SAME,
VERSION_NEWER) = list(range(4))
debug = 0
def __init__(self, filename=None, cache=None):
if cache is None:
cache = apt.Cache()
self._cache = cache
self._debfile = None
self.pkgname = ""
self._sections = {}
self._need_pkgs = []
self._check_was_run = False
self._failure_string = ""
self._multiarch = None
if filename:
self.open(filename)
def open(self, filename):
""" open given debfile """
self._dbg(3, "open '%s'" % filename)
self._need_pkgs = []
self._installed_conflicts = set()
self._failure_string = ""
self.filename = filename
self._debfile = apt_inst.DebFile(self.filename)
control = self._debfile.control.extractdata("control")
self._sections = apt_pkg.TagSection(control)
self.pkgname = self._sections["Package"]
self._check_was_run = False
def __getitem__(self, key):
return self._sections[key]
@property
def filelist(self):
"""return the list of files in the deb."""
files = []
try:
self._debfile.data.go(lambda item, data: files.append(item.name))
except SystemError:
return [_("List of files for '%s' could not be read") %
self.filename]
return files
@property
def control_filelist(self):
""" return the list of files in control.tar.gt """
control = []
try:
self._debfile.control.go(lambda item, data: control.append(item.name))
except SystemError:
return [_("List of control files for '%s' could not be read") %
self.filename]
return sorted(control)
# helper that will return a pkgname with a multiarch suffix if needed
def _maybe_append_multiarch_suffix(self, pkgname,
in_conflict_checking=False):
# trivial cases
if not self._multiarch:
return pkgname
elif self._cache.is_virtual_package(pkgname):
return pkgname
elif (pkgname in self._cache and
self._cache[pkgname].candidate and
self._cache[pkgname].candidate.architecture == "all"):
return pkgname
# now do the real multiarch checking
multiarch_pkgname = "%s:%s" % (pkgname, self._multiarch)
# the upper layers will handle this
if not multiarch_pkgname in self._cache:
return multiarch_pkgname
# now check the multiarch state
cand = self._cache[multiarch_pkgname].candidate._cand
#print pkgname, multiarch_pkgname, cand.multi_arch
# the default is to add the suffix, unless its a pkg that can satify
# foreign dependencies
if cand.multi_arch & cand.MULTI_ARCH_FOREIGN:
return pkgname
# for conflicts we need a special case here, any not multiarch enabled
# package has a implicit conflict
if (in_conflict_checking and
not (cand.multi_arch & cand.MULTI_ARCH_SAME)):
return pkgname
return multiarch_pkgname
def _is_or_group_satisfied(self, or_group):
"""Return True if at least one dependency of the or-group is satisfied.
This method gets an 'or_group' and analyzes if at least one dependency
of this group is already satisfied.
"""
self._dbg(2, "_checkOrGroup(): %s " % (or_group))
for dep in or_group:
depname = dep[0]
ver = dep[1]
oper = dep[2]
# multiarch
depname = self._maybe_append_multiarch_suffix(depname)
# check for virtual pkgs
if not depname in self._cache:
if self._cache.is_virtual_package(depname):
self._dbg(3, "_is_or_group_satisfied(): %s is virtual dep" % depname)
for pkg in self._cache.get_providing_packages(depname):
if pkg.is_installed:
return True
continue
# check real dependency
inst = self._cache[depname].installed
if inst is not None and apt_pkg.check_dep(inst.version, oper, ver):
return True
# if no real dependency is installed, check if there is
# a package installed that provides this dependency
# (e.g. scrollkeeper dependecies are provided by rarian-compat)
# but only do that if there is no version required in the
# dependency (we do not supprot versionized dependencies)
if not oper:
for ppkg in self._cache.get_providing_packages(
depname, include_nonvirtual=True):
if ppkg.is_installed:
self._dbg(3, "found installed '%s' that provides '%s'" % (ppkg.name, depname))
return True
return False
def _satisfy_or_group(self, or_group):
"""Try to satisfy the or_group."""
for dep in or_group:
depname, ver, oper = dep
# multiarch
depname = self._maybe_append_multiarch_suffix(depname)
# if we don't have it in the cache, it may be virtual
if not depname in self._cache:
if not self._cache.is_virtual_package(depname):
continue
providers = self._cache.get_providing_packages(depname)
# if a package just has a single virtual provider, we
# just pick that (just like apt)
if len(providers) != 1:
continue
depname = providers[0].name
# now check if we can satisfy the deps with the candidate(s)
# in the cache
pkg = self._cache[depname]
cand = self._cache._depcache.get_candidate_ver(pkg._pkg)
if not cand:
continue
if not apt_pkg.check_dep(cand.ver_str, oper, ver):
continue
# check if we need to install it
self._dbg(2, "Need to get: %s" % depname)
self._need_pkgs.append(depname)
return True
# if we reach this point, we failed
or_str = ""
for dep in or_group:
or_str += dep[0]
if ver and oper:
or_str += " (%s %s)" % (dep[2], dep[1])
if dep != or_group[len(or_group)-1]:
or_str += "|"
self._failure_string += _("Dependency is not satisfiable: %s\n") % or_str
return False
def _check_single_pkg_conflict(self, pkgname, ver, oper):
"""Return True if a pkg conflicts with a real installed/marked pkg."""
# FIXME: deal with conflicts against its own provides
# (e.g. Provides: ftp-server, Conflicts: ftp-server)
self._dbg(3, "_check_single_pkg_conflict() pkg='%s' ver='%s' oper='%s'" % (pkgname, ver, oper))
pkg = self._cache[pkgname]
if pkg.is_installed:
pkgver = pkg.installed.version
elif pkg.marked_install:
pkgver = pkg.candidate.version
else:
return False
#print "pkg: %s" % pkgname
#print "ver: %s" % ver
#print "pkgver: %s " % pkgver
#print "oper: %s " % oper
if (apt_pkg.check_dep(pkgver, oper, ver) and not
self.replaces_real_pkg(pkgname, oper, ver)):
self._failure_string += _("Conflicts with the installed package "
"'%s'") % pkg.name
self._dbg(3, "conflicts with installed pkg '%s'" % pkg.name)
return True
return False
def _check_conflicts_or_group(self, or_group):
"""Check the or-group for conflicts with installed pkgs."""
self._dbg(2, "_check_conflicts_or_group(): %s " % (or_group))
for dep in or_group:
depname = dep[0]
ver = dep[1]
oper = dep[2]
# FIXME: is this good enough? i.e. will apt always populate
# the cache with conflicting pkgnames for our arch?
depname = self._maybe_append_multiarch_suffix(
depname, in_conflict_checking=True)
# check conflicts with virtual pkgs
if not depname in self._cache:
# FIXME: we have to check for virtual replaces here as
# well (to pass tests/gdebi-test8.deb)
if self._cache.is_virtual_package(depname):
for pkg in self._cache.get_providing_packages(depname):
self._dbg(3, "conflicts virtual check: %s" % pkg.name)
# P/C/R on virtal pkg, e.g. ftpd
if self.pkgname == pkg.name:
self._dbg(3, "conflict on self, ignoring")
continue
if self._check_single_pkg_conflict(pkg.name, ver,
oper):
self._installed_conflicts.add(pkg.name)
continue
if self._check_single_pkg_conflict(depname, ver, oper):
self._installed_conflicts.add(depname)
return bool(self._installed_conflicts)
@property
def conflicts(self):
"""List of package names conflicting with this package."""
key = "Conflicts"
try:
return apt_pkg.parse_depends(self._sections[key])
except KeyError:
return []
@property
def depends(self):
"""List of package names on which this package depends on."""
depends = []
# find depends
for key in "Depends", "Pre-Depends":
try:
depends.extend(apt_pkg.parse_depends(self._sections[key]))
except KeyError:
pass
return depends
@property
def provides(self):
"""List of virtual packages which are provided by this package."""
key = "Provides"
try:
return apt_pkg.parse_depends(self._sections[key])
except KeyError:
return []
@property
def replaces(self):
"""List of packages which are replaced by this package."""
key = "Replaces"
try:
return apt_pkg.parse_depends(self._sections[key])
except KeyError:
return []
def replaces_real_pkg(self, pkgname, oper, ver):
"""Return True if a given non-virtual package is replaced.
Return True if the deb packages replaces a real (not virtual)
packages named (pkgname, oper, ver).
"""
self._dbg(3, "replaces_real_pkg() %s %s %s" % (pkgname, oper, ver))
pkg = self._cache[pkgname]
if pkg.is_installed:
pkgver = pkg.installed.version
elif pkg.marked_install:
pkgver = pkg.candidate.version
else:
pkgver = None
for or_group in self.replaces:
for (name, ver, oper) in or_group:
if (name == pkgname and apt_pkg.check_dep(pkgver, oper, ver)):
self._dbg(3, "we have a replaces in our package for the "
"conflict against '%s'" % (pkgname))
return True
return False
def check_conflicts(self):
"""Check if there are conflicts with existing or selected packages.
Check if the package conflicts with a existing or to be installed
package. Return True if the pkg is OK.
"""
res = True
for or_group in self.conflicts:
if self._check_conflicts_or_group(or_group):
#print "Conflicts with a exisiting pkg!"
#self._failure_string = "Conflicts with a exisiting pkg!"
res = False
return res
def check_breaks_existing_packages(self):
"""
check if installing the package would break exsisting
package on the system, e.g. system has:
smc depends on smc-data (= 1.4)
and user tries to installs smc-data 1.6
"""
# show progress information as this step may take some time
size = float(len(self._cache))
steps = max(int(size/50), 1)
debver = self._sections["Version"]
debarch = self._sections["Architecture"]
# store what we provide so that we can later check against that
provides = [ x[0][0] for x in self.provides]
for (i, pkg) in enumerate(self._cache):
if i%steps == 0:
self._cache.op_progress.update(float(i)/size*100.0)
if not pkg.is_installed:
continue
# check if the exising dependencies are still satisfied
# with the package
ver = pkg._pkg.current_ver
for dep_or in pkg.installed.dependencies:
for dep in dep_or.or_dependencies:
if dep.name == self.pkgname:
if not apt_pkg.check_dep(debver, dep.relation, dep.version):
self._dbg(2, "would break (depends) %s" % pkg.name)
# TRANSLATORS: the first '%s' is the package that breaks, the second the dependency that makes it break, the third the relation (e.g. >=) and the latest the version for the releation
self._failure_string += _("Breaks existing package '%(pkgname)s' dependency %(depname)s (%(deprelation)s %(depversion)s)") % {
'pkgname' : pkg.name,
'depname' : dep.name,
'deprelation' : dep.relation,
'depversion' : dep.version}
self._cache.op_progress.done()
return False
# now check if there are conflicts against this package on
# the existing system
if "Conflicts" in ver.depends_list:
for conflicts_ver_list in ver.depends_list["Conflicts"]:
for c_or in conflicts_ver_list:
if c_or.target_pkg.name == self.pkgname and c_or.target_pkg.architecture == debarch:
if apt_pkg.check_dep(debver, c_or.comp_type, c_or.target_ver):
self._dbg(2, "would break (conflicts) %s" % pkg.name)
# TRANSLATORS: the first '%s' is the package that conflicts, the second the packagename that it conflicts with (so the name of the deb the user tries to install), the third is the relation (e.g. >=) and the last is the version for the relation
self._failure_string += _("Breaks existing package '%(pkgname)s' conflict: %(targetpkg)s (%(comptype)s %(targetver)s)") % {
'pkgname' : pkg.name,
'targetpkg' : c_or.target_pkg.name,
'comptype' : c_or.comp_type,
'targetver' : c_or.target_ver }
self._cache.op_progress.done()
return False
if (c_or.target_pkg.name in provides and
self.pkgname != pkg.name):
self._dbg(2, "would break (conflicts) %s" % provides)
self._failure_string += _("Breaks existing package '%(pkgname)s' that conflict: '%(targetpkg)s'. But the '%(debfile)s' provides it via: '%(provides)s'") % {
'provides' : ",".join(provides),
'debfile' : self.filename,
'targetpkg' : c_or.target_pkg.name,
'pkgname' : pkg.name }
self._cache.op_progress.done()
return False
self._cache.op_progress.done()
return True
def compare_to_version_in_cache(self, use_installed=True):
"""Compare the package to the version available in the cache.
Checks if the package is already installed or availabe in the cache
and if so in what version, returns one of (VERSION_NONE,
VERSION_OUTDATED, VERSION_SAME, VERSION_NEWER).
"""
self._dbg(3, "compare_to_version_in_cache")
pkgname = self._sections["Package"]
debver = self._sections["Version"]
self._dbg(1, "debver: %s" % debver)
if pkgname in self._cache:
if use_installed and self._cache[pkgname].installed:
cachever = self._cache[pkgname].installed.version
elif not use_installed and self._cache[pkgname].candidate:
cachever = self._cache[pkgname].candidate.version
else:
return self.VERSION_NONE
if cachever is not None:
cmp = apt_pkg.version_compare(cachever, debver)
self._dbg(1, "CompareVersion(debver,instver): %s" % cmp)
if cmp == 0:
return self.VERSION_SAME
elif cmp < 0:
return self.VERSION_NEWER
elif cmp > 0:
return self.VERSION_OUTDATED
return self.VERSION_NONE
def check(self):
"""Check if the package is installable."""
self._dbg(3, "check")
self._check_was_run = True
# check arch
if not "Architecture" in self._sections:
self._dbg(1, "ERROR: no architecture field")
self._failure_string = _("No Architecture field in the package")
return False
arch = self._sections["Architecture"]
if arch != "all" and arch != apt_pkg.config.find("APT::Architecture"):
if arch in apt_pkg.get_architectures():
self._multiarch = arch
self.pkgname = "%s:%s" % (self.pkgname, self._multiarch)
self._dbg(1, "Found multiarch arch: '%s'" % arch)
else:
self._dbg(1, "ERROR: Wrong architecture dude!")
self._failure_string = _("Wrong architecture '%s'") % arch
return False
# check version
if self.compare_to_version_in_cache() == self.VERSION_OUTDATED:
if self._cache[self.pkgname].installed:
# the deb is older than the installed
self._failure_string = _("A later version is already installed")
return False
# FIXME: this sort of error handling sux
self._failure_string = ""
# check conflicts
if not self.check_conflicts():
return False
# check if installing it would break anything on the
# current system
if not self.check_breaks_existing_packages():
return False
# try to satisfy the dependencies
if not self._satisfy_depends(self.depends):
return False
# check for conflicts again (this time with the packages that are
# makeed for install)
if not self.check_conflicts():
return False
if self._cache._depcache.broken_count > 0:
self._failure_string = _("Failed to satisfy all dependencies "
"(broken cache)")
# clean the cache again
self._cache.clear()
return False
return True
def satisfy_depends_str(self, dependsstr):
"""Satisfy the dependencies in the given string."""
return self._satisfy_depends(apt_pkg.parse_depends(dependsstr))
def _satisfy_depends(self, depends):
"""Satisfy the dependencies."""
# turn off MarkAndSweep via a action group (if available)
try:
_actiongroup = apt_pkg.ActionGroup(self._cache._depcache)
except AttributeError:
pass
# check depends
for or_group in depends:
#print "or_group: %s" % or_group
#print "or_group satified: %s" % self._is_or_group_satisfied(or_group)
if not self._is_or_group_satisfied(or_group):
if not self._satisfy_or_group(or_group):
return False
# now try it out in the cache
for pkg in self._need_pkgs:
try:
self._cache[pkg].mark_install(from_user=False)
except SystemError:
self._failure_string = _("Cannot install '%s'") % pkg
self._cache.clear()
return False
return True
@property
def missing_deps(self):
"""Return missing dependencies."""
self._dbg(1, "Installing: %s" % self._need_pkgs)
if not self._check_was_run:
raise AttributeError("property only available after check() was run")
return self._need_pkgs
@property
def required_changes(self):
"""Get the changes required to satisfy the dependencies.
Returns: a tuple with (install, remove, unauthenticated)
"""
install = []
remove = []
unauthenticated = []
if not self._check_was_run:
raise AttributeError("property only available after check() was run")
for pkg in self._cache:
if pkg.marked_install or pkg.marked_upgrade:
install.append(pkg.name)
# check authentication, one authenticated origin is enough
# libapt will skip non-authenticated origins then
authenticated = False
for origin in pkg.candidate.origins:
authenticated |= origin.trusted
if not authenticated:
unauthenticated.append(pkg.name)
if pkg.marked_delete:
remove.append(pkg.name)
return (install, remove, unauthenticated)
@staticmethod
def to_hex(in_data):
hex = ""
for (i, c) in enumerate(in_data):
if i%80 == 0:
hex += "\n"
hex += "%2.2x " % ord(c)
return hex
@staticmethod
def to_strish(in_data):
s = ""
# py2 compat, in_data is type string
if type(in_data) == str:
for c in in_data:
if ord(c) < 10 or ord(c) > 127:
s += " "
else:
s += c
# py3 compat, in_data is type bytes
else:
for b in in_data:
if b < 10 or b > 127:
s += " "
else:
s += chr(b)
return s
def _get_content(self, part, name, auto_decompress=True, auto_hex=True):
if name.startswith("./"):
name = name[2:]
data = part.extractdata(name)
# check for zip content
if name.endswith(".gz") and auto_decompress:
io = StringIO(data)
gz = gzip.GzipFile(fileobj=io)
data = _("Automatically decompressed:\n\n")
data += gz.read()
# auto-convert to hex
try:
data = str(data, "utf-8")
except Exception:
new_data = _("Automatically converted to printable ascii:\n")
new_data += self.to_strish(data)
return new_data
return data
def control_content(self, name):
""" return the content of a specific control.tar.gz file """
try:
return self._get_content(self._debfile.control, name)
except LookupError:
return ""
def data_content(self, name):
""" return the content of a specific control.tar.gz file """
try:
return self._get_content(self._debfile.data, name)
except LookupError:
return ""
def _dbg(self, level, msg):
"""Write debugging output to sys.stderr."""
if level <= self.debug:
print(msg, file=sys.stderr)
def install(self, install_progress=None):
"""Install the package."""
if install_progress is None:
return os.spawnlp(os.P_WAIT, "dpkg", "dpkg", "-i", self.filename)
else:
try:
install_progress.start_update()
except AttributeError:
install_progress.startUpdate()
res = install_progress.run(self.filename)
try:
install_progress.finish_update()
except AttributeError:
install_progress.finishUpdate()
return res
class DscSrcPackage(DebPackage):
"""A locally available source package."""
def __init__(self, filename=None, cache=None):
DebPackage.__init__(self, None, cache)
self.filename = filename
self._depends = []
self._conflicts = []
self._installed_conflicts = set()
self.pkgname = ""
self.binaries = []
if self.filename is not None:
self.open(self.filename)
@property
def depends(self):
"""Return the dependencies of the package"""
return self._depends
@property
def conflicts(self):
"""Return the dependencies of the package"""
return self._conflicts
def open(self, file):
"""Open the package."""
depends_tags = ["Build-Depends", "Build-Depends-Indep"]
conflicts_tags = ["Build-Conflicts", "Build-Conflicts-Indep"]
fobj = open(file)
tagfile = apt_pkg.TagFile(fobj)
try:
for sec in tagfile:
for tag in depends_tags:
if not tag in sec:
continue
self._depends.extend(apt_pkg.parse_src_depends(sec[tag]))
for tag in conflicts_tags:
if not tag in sec:
continue
self._conflicts.extend(apt_pkg.parse_src_depends(sec[tag]))
if 'Source' in sec:
self.pkgname = sec['Source']
if 'Binary' in sec:
self.binaries = sec['Binary'].split(', ')
if 'Version' in sec:
self._sections['Version'] = sec['Version']
finally:
del tagfile
fobj.close()
s = _("Install Build-Dependencies for "
"source package '%s' that builds %s\n") % (self.pkgname,
" ".join(self.binaries))
self._sections["Description"] = s
self._check_was_run = False
def check(self):
"""Check if the package is installable.."""
if not self.check_conflicts():
for pkgname in self._installed_conflicts:
if self._cache[pkgname]._pkg.essential:
raise Exception(_("An essential package would be removed"))
self._cache[pkgname].mark_delete()
# properties are ok now
self._check_was_run = True
# FIXME: a additional run of the check_conflicts()
# after _satisfy_depends() should probably be done
return self._satisfy_depends(self.depends)
def _test():
"""Test function"""
from apt.cache import Cache
from apt.progress.base import InstallProgress
cache = Cache()
vp = "www-browser"
print("%s virtual: %s" % (vp, cache.is_virtual_package(vp)))
providers = cache.get_providing_packages(vp)
print("Providers for %s :" % vp)
for pkg in providers:
print(" %s" % pkg.name)
d = DebPackage(sys.argv[1], cache)
print("Deb: %s" % d.pkgname)
if not d.check():
print("can't be satified")
print(d._failure_string)
print("missing deps: %s" % d.missing_deps)
print(d.required_changes)
print(d.filelist)
print("Installing ...")
ret = d.install(InstallProgress())
print(ret)
#s = DscSrcPackage(cache, "../tests/3ddesktop_0.2.9-6.dsc")
#s.check_dep()
#print "Missing deps: ",s.missingDeps
#print "Print required changes: ", s.requiredChanges
s = DscSrcPackage(cache=cache)
d = "libc6 (>= 2.3.2), libaio (>= 0.3.96) | libaio1 (>= 0.3.96)"
print(s._satisfy_depends(apt_pkg.parse_depends(d)))
if __name__ == "__main__":
_test()
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