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chroot leaving mount points still... er... mounted. https://github.com/pkgcore/pychroot/issues/22

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brent s.
2016-11-19 20:23:14 -05:00
parent f419a6e4f6
commit 7cdf0eef50
5 changed files with 225 additions and 172 deletions
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bdisk/prep.py Executable file
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import os
import shutil
import re
import hashlib
import gnupg
import tarfile
import subprocess
import re
import git
import jinja2
import datetime
from urllib.request import urlopen
def archChk(arch):
if arch in ['i686', 'x86_64']:
return(arch)
else:
exit("{0} is not a valid architecture. Must be one of i686 or x86_64.".format(arch))
def downloadTarball(arch, dlpath):
# arch - should be i686 or x86_64
# returns path/filename e.g. /some/path/to/file.tar.gz
# we use .gnupg since we'll need it later.
archChk(arch)
try:
os.makedirs(dlpath + '/.gnupg')
except OSError as exception:
if exception.errno != errno.EEXIST:
raise
tarball_path = dlpath + '/.latest.' + arch + '.tar.gz'
#mirror = 'http://mirrors.kernel.org/archlinux'
mirror = 'https://mirror.us.leaseweb.net/archlinux'
rlsdir = mirror + '/iso/latest'
sha_in = urlopen(rlsdir + '/sha1sums.txt')
sha1sums = sha_in.read()
sha_in.close()
sha1_list = sha1sums.decode("utf-8")
sha_list = list(filter(None, sha1_list.split('\n')))
sha_dict = {x.split()[1]: x.split()[0] for x in sha_list}
pattern = re.compile('^archlinux-bootstrap-[0-9]{4}\.[0-9]{2}\.[0-9]{2}-' + arch + '\.tar\.gz$')
tarball = [filename.group(0) for l in list(sha_dict.keys()) for filename in [pattern.search(l)] if filename][0]
sha1 = sha_dict[tarball]
# all that lousy work just to get a sha1 sum. okay. so.
if os.path.isfile(tarball_path):
pass
else:
# fetch the tarball...
print("Fetching the tarball for {0} architecture, please wait...".format(arch))
tarball_dl = urlopen(rlsdir + tarball)
with open(dlpath + '/latest.' + arch + '.tar.gz', 'wb') as f:
f.write(tarball_dl)
tarball_dl.close()
tarball_hash = hashlib.sha1(open(tarball_path, 'rb').read()).hexdigest()
if tarball_hash != sha1:
exit("There was a failure fetching the tarball and the wrong version exists on the filesystem.\nPlease try again later.")
else:
# okay, so the sha1 matches. let's verify the signature.
# we don't want to futz with the user's normal gpg.
gpg = gnupg.GPG(gnupghome = dlpath + '/.gnupg')
input_data = gpg.gen_key_input(name_email = 'tempuser@nodomain.tld', passphrase = 'placeholder_passphrase')
key = gpg.gen_key(input_data)
keyid = '7F2D434B9741E8AC'
gpg.recv_keys('pgp.mit.edu', keyid)
gpg_sig = tarball + '.sig'
sig_dl = urlopen(rlsdir + gpg_sig)
with open(tarball_path + '.sig', 'wb+') as f:
f.write(sig_dl)
sig_dl.close()
sig = tarball_path + '.sig'
tarball_data = open(tarball_path, 'rb')
tarball_data_in = tarball_data.read()
gpg_verify = gpg.verify_data(sig, tarball_data_in)
tarball_data.close()
if not gpg_verify:
exit("There was a failure checking the signature of the release tarball. Please investigate.")
os.remove(sig)
return(tarball_path)
def unpackTarball(tarball_path, chrootdir):
# Make the dir if it doesn't exist
try:
os.makedirs(chrootdir)
except OSError as exception:
if exception.errno != errno.EEXIST:
raise
# Open and extract the tarball
tar = tarfile.open(tarball_path, 'r:gz')
tar.extractall(path = destdir)
tar.close()
return(True)
def buildChroot(arch, chrootdir, dlpath, extradir):
unpack_me = unpackTarball(downloadTarball(archChk(arch), dlpath), chrootdir)
if unpack_me:
pass
else:
exit("Something went wrong when trying to unpack the tarball.")
print("The download and extraction has completed. Now prepping the chroot environment with some additional changes.")
# build dict of lists of files and dirs from pre-build.d dir, do the same with arch-specific changes.
prebuild_overlay = {}
prebuild_arch_overlay = {}
for x in ['i686', 'x86_64']:
prebuild_arch_overlay[x] = {}
for y in ['files', 'dirs']:
prebuild_overlay[y] = []
prebuild_arch_overlay[x][y] = []
for path, dirs, files in os.walk(extradir + '/pre-build.d/'):
prebuild_overlay['dirs'].append(path + '/')
for file in files:
prebuild_overlay['files'].append(os.path.join(path, file))
for x in prebuild_overlay.keys():
prebuild_overlay[x][:] = [re.sub('^' + extradir + '/pre-build.d/', '', s) for s in prebuild_overlay[x]]
prebuild_overlay[x] = list(filter(None, prebuild_overlay[x]))
for y in prebuild_arch_overlay.keys():
prebuild_arch_overlay[y][x][:] = [i for i in prebuild_overlay[x] if i.startswith(y)]
prebuild_arch_overlay[y][x][:] = [re.sub('^' + y + '/', '', s) for s in prebuild_arch_overlay[y][x]]
prebuild_arch_overlay[y][x] = list(filter(None, prebuild_arch_overlay[y][x]))
prebuild_overlay[x][:] = [y for y in prebuild_overlay[x] if not y.startswith(('x86_64','i686'))]
prebuild_overlay['dirs'].remove('/')
# create the dir structure. these should almost definitely be owned by root.
for dir in prebuild_overlay['dirs']:
os.makedirs(chrootdir + '/' + dir, exist_ok = True)
os.chown(chrootdir + '/' + dir, 0, 0)
# and copy over the files. again, chown to root.
for file in prebuild_overlay['files']:
shutil.copy2(extradir + '/pre-build.d/' + file, chrootdir + '/' + file)
os.chown(chrootdir + '/' + file, 0, 0)
# do the same for arch-specific stuff.
for dir in prebuild_arch_overlay[arch]['dirs']:
os.makedirs(chrootdir + '/' + dir, exist_ok = True)
os.chown(chrootdir + '/' + dir, 0, 0)
for file in prebuild_arch_overlay[arch]['files']:
shutil.copy2(extradir + '/pre-build.d/' + arch + '/' + file, chrootdir + '/' + file)
os.chown(chrootdir + '/' + file, 0, 0)
return(chrootdir)
def prepChroot(templates_dir, chrootdir, bdisk, arch):
build = {}
# let's prep some variables to write out the version info.txt
# get the git tag and short commit hash
repo = git.Repo(bdisk['dir'])
refs = repo.git.describe(repo.head.commit).split('-')
build['ver'] = refs[0] + '-' + refs[2]
# and these should be passed in from the args, from the most part.
build['name'] = bdisk['name']
build['time'] = datetime.datetime.utcnow().strftime("%a %b %d %H:%M:%S UTC %Y")
build['host'] = bdisk['hostname']
build['user'] = os.environ['USER']
if os.environ['SUDO_USER']:
build['realuser'] = os.environ['SUDO_USER']
# and now that we have that dict, let's write out the VERSION_INFO.txt file.
env = jinja2.Environment(loader=FileSystemLoader(templates_dir))
tpl = env.get_template('VERSION_INFO.txt.j2')
tpl_out = template.render(build = build)
with open(chrootdir + '/root/VERSION_INFO.txt', "wb+") as f:
fh.write(tpl_out)
return(build)