Hi,
This is one part of the makepkg test suite I am working on. It is
fairly a simple class that takes a pacman package filename and does some
parsing. Currently that involves getting the file list and the info
from the .PKGINFO file.
I am still fairly new to python so I am looking for comments on how this
could be improved.
One idea I have had is to not initialize all the fields in the pkginfo
dict and add a test if an array exists before appending. It would make
the code tidier but that would mean the need to test if the field exists
when comparing it later.
---
#!/usr/bin/env python3
import os, tarfile
class package:
'''
parse information from a pacman package
member variables:
file (string) - name of package file
file_list (array) - list of files in the package archive
pkginfo (dict) - package information parsed from .PKGINFO
'''
def __init__ (self, file):
self.file = file
if not os.path.exists(file):
raise IOError('{} does not exist'.format(file))
if not tarfile.is_tarfile(file):
raise TypeError('{} is not a tar file'.format(file))
pkg = tarfile.open(file)
self.file_list = pkg.getnames()
if not ".PKGINFO" in self.file_list:
raise TypeError('{} is not a package file'.format(file))
self.__parse_pkginfo(pkg)
pkg.close()
def __parse_pkginfo(self, pkg):
self.pkginfo = {}
self.pkginfo['pkgname'] = ""
self.pkginfo['pkgbase'] = ""
self.pkginfo['pkgver'] = ""
self.pkginfo['pkgdesc'] = ""
self.pkginfo['url'] = ""
self.pkginfo['builddate'] = ""
self.pkginfo['packager'] = ""
self.pkginfo['size'] = ""
self.pkginfo['arch'] = ""
self.pkginfo['force'] = ""
self.pkginfo['license'] = []
self.pkginfo['replaces'] = []
self.pkginfo['group'] = []
self.pkginfo['depend'] = []
self.pkginfo['optdepend'] = []
self.pkginfo['conflict'] = []
self.pkginfo['provides'] = []
self.pkginfo['backup'] = []
self.pkginfo['makepkgopt'] = []
arrays = ['license', 'replaces', 'group', 'depend', 'optdepend',
'conflict', 'provides', 'backup', 'makepkgopt']
pkginfo = pkg.extractfile(".PKGINFO")
for line in pkginfo:
if (line[0] == '#'.encode('utf-8')[0]):
continue
(key, value) = line.decode('utf-8').split(" = ")
if key in arrays:
self.pkginfo[key].append(value.strip())
else:
self.pkginfo[key] = value.strip()
pkginfo.close()
if __name__ == '__main__':
pkg = package('/var/cache/pacman/pkg/pacman-3.3.1-1-i686.pkg.tar.gz')
print('Package file: \n\t{}\n'.format(pkg.file))
print('Package info: \n\t{}\n'.format(pkg.pkginfo))
print('File list: \n\t{}\n'.format(pkg.file_list))
---
Example output:
> python3 package.py
Package file:
/var/cache/pacman/pkg/pacman-3.3.1-1-i686.pkg.tar.gz
Package info:
{'license': ['GPL'], 'backup': ['etc/pacman.conf',
'etc/makepkg.conf'], 'replaces': [], 'pkgname': 'pacman', 'builddate':
'1253674558', 'pkgdesc': 'A library-based package manager with
dependency support', 'makepkgopt': ['strip', '!docs', '!libtool',
'emptydirs', 'zipman', 'purge'], 'url':
'http://www.archlinux.org/pacman/', 'optdepend': ['fakeroot: for makepkg
usage as normal user', 'python: for rankmirrors script usage'],
'depend': ['bash', 'libarchive>=2.7.0-2', 'libfetch>=2.20',
'pacman-mirrorlist'], 'group': ['base'], 'pkgbase': '', 'provides': [],
'force': '', 'packager': 'Dan McGee <[email protected]>', 'size':
'2093056', 'arch': 'i686', 'conflict': [], 'pkgver': '3.3.1-1'}
File list:
['.PKGINFO', '.INSTALL', 'etc', 'etc/makepkg.conf',
'etc/pacman.conf', 'etc/bash_completion.d',
'etc/bash_completion.d/pacman', 'usr', 'usr/include', 'usr/share',
'usr/bin', 'usr/lib', 'usr/lib/libalpm.so.4',
'usr/lib/libalpm.so.4.0.1', 'usr/lib/libalpm.so', 'usr/lib/libalpm.a', ....
#!/usr/bin/env python3
import os, tarfile
class package:
'''
parse information from a pacman package
member variables:
file (string) - name of package file
file_list (array) - list of files in the package archive
pkginfo (dict) - package information parsed from .PKGINFO
'''
def __init__ (self, file):
self.file = file
if not os.path.exists(file):
raise IOError('{} does not exist'.format(file))
if not tarfile.is_tarfile(file):
raise TypeError('{} is not a tar file'.format(file))
pkg = tarfile.open(file)
self.file_list = pkg.getnames()
if not ".PKGINFO" in self.file_list:
raise TypeError('{} is not a package file'.format(file))
self.__parse_pkginfo(pkg)
pkg.close()
def __parse_pkginfo(self, pkg):
self.pkginfo = {}
self.pkginfo['pkgname'] = ""
self.pkginfo['pkgbase'] = ""
self.pkginfo['pkgver'] = ""
self.pkginfo['pkgdesc'] = ""
self.pkginfo['url'] = ""
self.pkginfo['builddate'] = ""
self.pkginfo['packager'] = ""
self.pkginfo['size'] = ""
self.pkginfo['arch'] = ""
self.pkginfo['force'] = ""
self.pkginfo['license'] = []
self.pkginfo['replaces'] = []
self.pkginfo['group'] = []
self.pkginfo['depend'] = []
self.pkginfo['optdepend'] = []
self.pkginfo['conflict'] = []
self.pkginfo['provides'] = []
self.pkginfo['backup'] = []
self.pkginfo['makepkgopt'] = []
arrays = ['license', 'replaces', 'group', 'depend', 'optdepend',
'conflict', 'provides', 'backup', 'makepkgopt']
pkginfo = pkg.extractfile(".PKGINFO")
for line in pkginfo:
if (line[0] == '#'.encode('utf-8')[0]):
continue
(key, value) = line.decode('utf-8').split(" = ")
if key in arrays:
self.pkginfo[key].append(value.strip())
else:
self.pkginfo[key] = value.strip()
pkginfo.close()
if __name__ == '__main__':
pkg = package('/var/cache/pacman/pkg/pacman-3.3.1-1-i686.pkg.tar.gz')
print('Package file: \n\t{}\n'.format(pkg.file))
print('Package info: \n\t{}\n'.format(pkg.pkginfo))
print('File list: \n\t{}\n'.format(pkg.file_list))
