borgextend/tools/restore_yum_pkgs.py

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2019-06-05 21:47:31 -04:00
#!/usr/bin/env python
import argparse # yum install python-argparse on CentOS/RHEL 6.x
import os
import re
import subprocess
import sys
import warnings
##
# The yum API is *suuuper* cantankerous and kind of broken, even.
# Patches welcome, but for now we just use subprocess.
import yum
from lxml import etree # yum install python-lxml
# Detect RH version.
ver_re =re.compile('^(centos.*|red\s?hat.*) ([0-9\.]+) .*$', re.IGNORECASE)
# distro module isn't stdlib, and platform.linux_distribution() (AND platform.distro()) are both deprecated in 3.7.
# So we get hacky.
with open('/etc/redhat-release', 'r') as f:
rawver = f.read()
distver = [int(i) for i in ver_re.sub('\g<2>', rawver.strip()).split('.')]
distname = re.sub('(Linux )?release', '', ver_re.sub('\g<1>', rawver.strip()), re.IGNORECASE).strip()
# Regex pattern to get the repo name. We compile it just to speed up the execution.
repo_re = re.compile('^@')
# Python version
pyver = sys.hexversion
py3 = 0x30000f0 # TODO: check the version incompats
if pyver < py3:
import copy
class Reinstaller(object):
def __init__(self, pkglist_path, latest = True):
self.latest = latest
pkglist_file = os.path.abspath(os.path.expanduser(pkglist_path))
with open(pkglist_file, 'rb') as f:
self.pkgs = etree.fromstring(f.read())
if not self.latest:
# Make sure the versions match, otherwise Bad Things(TM) can occur.
if not all(((distname == self.pkgs.attrib['distro']),
('.'.join([str(i) for i in distver]) == self.pkgs.attrib['version']))):
err = ('This package set was created on {0} {1}. '
'The current running OS is {2} {3} and you have set latest = False/None. '
'THIS IS A VERY BAD IDEA.').format(self.pkgs.attrib['distro'],
self.pkgs.attrib['version'],
distname,
'.'.join([str(i) for i in distver]))
raise RuntimeError(err)
# Make it run silently.
self.yb = yum.YumBase()
self.yb.preconf.quiet = 1
self.yb.preconf.debuglevel = 0
self.yb.preconf.errorlevel = 0
self.yb.preconf.assumeyes = 1
self.yb.preconf.rpmverbosity = 'error'
def iterPkgs(self):
for repo in self.pkgs.findall('repo'):
# Base install packages ("anaconda") don't play nicely with this. They should be expected to
# already be installed anyways, and self.latest is irrelevant - downgrading these can cause
# *major* issues.
# And "installed" repo are packages installed manually from RPM.
if self.latest:
if repo.attrib['name'].lower() in ('anaconda', 'installed'):
continue
reponm = repo.attrib['desc']
# This is only needed for the subprocess workaround.
cmd = ['yum', '-q', '-y',
# '--disablerepo=*',
'--enablerepo={0}'.format(repo.attrib['name'])]
pkgs = {'new': [],
'upgrade': [],
'downgrade': []}
for pkg in repo.findall('package'):
pkg_found = False
is_installed = False
if self.latest:
pkgnm = pkg.attrib['name']
else:
pkgnm = pkg.attrib['NEVRA']
pkglist = self.yb.doPackageLists(patterns = [pkgnm], showdups = True)
if pkglist.updates:
for pkgobj in reversed(pkglist.updates):
if pkgobj.repo.name == reponm:
# Haven't gotten this working properly. Patches welcome.
# self.yb.install(po = pkgobj)
# self.yb.resolveDeps()
# self.yb.buildTransaction()
# self.yb.processTransaction()
if self.latest:
pkgs['upgrade'].append(pkgobj.name)
else:
if distver[0] >= 7:
pkgs['upgrade'].append(pkgobj.nevra)
else:
pkgs['upgrade'].append(pkgobj._ui_nevra())
pkg_found = True
is_installed = False
break
if pkglist.installed and not pkg_found:
for pkgobj in reversed(pkglist.installed):
if pkgobj.repo.name == reponm:
if distver[0] >= 7:
nevra = pkgobj.nevra
else:
nevra = pkgobj._ui_nevra()
warn = ('{0} from {1} is already installed; skipping').format(nevra,
repo.attrib['name'])
warnings.warn(warn)
pkg_found = True
is_installed = True
if not all((is_installed, pkg_found)):
if pkglist.available:
for pkgobj in reversed(pkglist.available):
if pkgobj.repo.name == reponm:
# Haven't gotten this working properly. Patches welcome.
# self.yb.install(po = pkgobj)
# self.yb.resolveDeps()
# self.yb.buildTransaction()
# self.yb.processTransaction()
if self.latest:
pkgs['new'].append(pkgobj.name)
else:
if distver[0] >= 7:
pkgs['new'].append(pkgobj.nevra)
else:
pkgs['new'].append(pkgobj._ui_nevra())
is_installed = False
pkg_found = True
break
if not self.latest:
if pkglist.old_available:
for pkgobj in reversed(pkglist.old_available):
if pkgobj.repo.name == reponm:
# Haven't gotten this working properly. Patches welcome.
# self.yb.install(po = pkgobj)
# self.yb.resolveDeps()
# self.yb.buildTransaction()
# self.yb.processTransaction()
if distver[0] >= 7:
pkgs['downgrade'].append(pkgobj.nevra)
else:
pkgs['downgrade'].append(pkgobj._ui_nevra())
pkg_found = True
break
# # This... seems to always fail. Patches welcome.
# # self.yb.processTransaction()
for k in pkgs:
if not pkgs[k]:
continue
if pyver < py3:
_cmd = copy.deepcopy(cmd)
else:
_cmd = cmd.copy()
if k == 'downgrade':
_cmd.append('downgrade')
else:
if self.latest:
_cmd.append('install')
else:
if distver[0] >= 7:
_cmd.append('install-nevra')
else:
_cmd.append('install')
_cmd.extend(pkgs[k])
if pyver >= py3:
subprocess.run(_cmd)
else:
subprocess.call(_cmd)
return()
def parseArgs():
args = argparse.ArgumentParser(description = ('Reinstall packages from a generated XML package list'))
args.add_argument('-V', '--version',
dest = 'latest',
action = 'store_false',
help = ('If specified, (try to) install the same version as specified in the package list.'))
args.add_argument('pkglist_path',
metavar = 'PKGLIST',
help = ('The path to the generated packages XML file.'))
return(args)
def main():
args = parseArgs().parse_args()
dictargs = vars(args)
r = Reinstaller(**dictargs)
r.iterPkgs()
return()
if __name__ == '__main__':
main()