qvm-template: Reorder functions.

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WillyPillow 2020-08-01 02:40:27 +08:00
parent 233e411c2f
commit 3d0a39523b
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@ -123,6 +123,31 @@ DlEntry = collections.namedtuple('DlEntry', [
'dlsize' 'dlsize'
]) ])
def build_version_str(evr):
return '%s:%s-%s' % evr
def is_match_spec(name, epoch, version, release, spec):
# Refer to "NEVRA Matching" in the DNF documentation
# NOTE: Currently "arch" is ignored as the templates should be of "noarch"
if epoch != 0:
targets = [
f'{name}-{epoch}:{version}-{release}',
f'{name}',
f'{name}-{epoch}:{version}'
]
else:
targets = [
f'{name}-{epoch}:{version}-{release}',
f'{name}-{version}-{release}',
f'{name}',
f'{name}-{epoch}:{version}',
f'{name}-{version}'
]
for prio, target in enumerate(targets):
if fnmatch.fnmatch(target, spec):
return True, prio
return False, float('inf')
def query_local(vm): def query_local(vm):
return Template( return Template(
vm.features['template-name'], vm.features['template-name'],
@ -147,10 +172,135 @@ def is_managed_template(vm):
return 'template-name' in vm.features \ return 'template-name' in vm.features \
and vm.name == vm.features['template-name'] and vm.name == vm.features['template-name']
# NOTE: Verifying RPMs this way is prone to TOCTOU. This is okay for local def qrexec_popen(args, app, service, stdout=subprocess.PIPE, filter_esc=True):
# files, but may create problems if multiple instances of `qvm-template` are if args.updatevm:
# downloading the same file, so a lock is needed in that case. return app.domains[args.updatevm].run_service(
service,
filter_esc=filter_esc,
stdout=stdout)
return subprocess.Popen([
'/etc/qubes-rpc/%s' % service,
],
stdin=subprocess.PIPE,
stdout=stdout,
stderr=subprocess.PIPE)
def qrexec_payload(args, app, spec, refresh):
_ = app # unused
# TODO: Check that spec != '---'
def check_newline(string, name):
if '\n' in string:
parser.error(f"Malformed {name}:" +
" argument should not contain '\\n'.")
payload = ''
for repo in args.enablerepo if args.enablerepo else []:
check_newline(repo, '--enablerepo')
payload += '--enablerepo=%s\n' % repo
for repo in args.disablerepo if args.disablerepo else []:
check_newline(repo, '--disablerepo')
payload += '--disablerepo=%s\n' % repo
for repo in args.repoid if args.repoid else []:
check_newline(repo, '--repoid')
payload += '--repoid=%s\n' % repo
if refresh:
payload += '--refresh\n'
check_newline(args.releasever, '--releasever')
payload += '--releasever=%s\n' % args.releasever
check_newline(spec, 'template name')
payload += spec + '\n'
payload += '---\n'
for path in args.repo_files:
with open(path, 'r') as fd:
payload += fd.read() + '\n'
return payload
def qrexec_repoquery(args, app, spec='*', refresh=False):
proc = qrexec_popen(args, app, 'qubes.TemplateSearch')
payload = qrexec_payload(args, app, spec, refresh)
stdout, stderr = proc.communicate(payload.encode('UTF-8'))
stdout = stdout.decode('ASCII')
if proc.wait() != 0:
for line in stderr.decode('ASCII').rstrip().split('\n'):
print('[Qrexec] %s' % line, file=sys.stderr)
raise ConnectionError("qrexec call 'qubes.TemplateSearch' failed.")
name_re = re.compile(r'^[A-Za-z0-9._+\-]*$')
evr_re = re.compile(r'^[A-Za-z0-9._+~]*$')
date_re = re.compile(r'^\d+-\d+-\d+ \d+:\d+$')
licence_re = re.compile(r'^[A-Za-z0-9._+\-()]*$')
result = []
for line in stdout.split('|\n'):
# Note that there's an empty entry at the end as .strip() is not used.
# This is because if .strip() is used, the .split() will not work.
if line == '':
continue
entry = line.split('|')
try:
# If there is an incorrect number of entries, raise an error
# Unpack manually instead of stuffing into `Template` right away
# so that it's easier to mutate stuff.
name, epoch, version, release, reponame, dlsize, \
buildtime, licence, url, summary, description = entry
# Ignore packages that are not templates
if not name.startswith(PACKAGE_NAME_PREFIX):
continue
name = name[len(PACKAGE_NAME_PREFIX):]
# Check that the values make sense
if not re.fullmatch(name_re, name):
raise ValueError
for val in [epoch, version, release]:
if not re.fullmatch(evr_re, val):
raise ValueError
if not re.fullmatch(name_re, reponame):
raise ValueError
dlsize = int(dlsize)
# First verify that the date does not look weird, then parse it
if not re.fullmatch(date_re, buildtime):
raise ValueError
buildtime = datetime.datetime.strptime(buildtime, '%Y-%m-%d %H:%M')
# XXX: Perhaps whitelist licenses directly?
if not re.fullmatch(licence_re, licence):
raise ValueError
# Check name actually matches spec
if not is_match_spec(name, epoch, version, release, spec):
continue
result.append(Template(name, epoch, version, release, reponame,
dlsize, buildtime, licence, url, summary, description))
except (TypeError, ValueError):
raise ConnectionError(("qrexec call 'qubes.TemplateSearch' failed:"
" unexpected data format."))
return result
def qrexec_download(args, app, spec, path, dlsize=None, refresh=False):
with open(path, 'wb') as fd:
# Don't filter ESCs for binary files
proc = qrexec_popen(args, app, 'qubes.TemplateDownload',
stdout=fd, filter_esc=False)
payload = qrexec_payload(args, app, spec, refresh)
proc.stdin.write(payload.encode('UTF-8'))
proc.stdin.close()
with tqdm.tqdm(desc=spec, total=dlsize, unit_scale=True,
unit_divisor=1000, unit='B') as pbar:
last = 0
while proc.poll() is None:
cur = fd.tell()
pbar.update(cur - last)
last = cur
time.sleep(0.1)
if proc.wait() != 0:
raise ConnectionError(
"qrexec call 'qubes.TemplateDownload' failed.")
return True
def verify_rpm(path, nogpgcheck=False, transaction_set=None): def verify_rpm(path, nogpgcheck=False, transaction_set=None):
# NOTE: Verifying RPMs this way is prone to TOCTOU. This is okay for local
# files, but may create problems if multiple instances of `qvm-template`
# are downloading the same file, so a lock is needed in that case.
if transaction_set is None: if transaction_set is None:
transaction_set = rpm.TransactionSet() transaction_set = rpm.TransactionSet()
with open(path, 'rb') as fd: with open(path, 'rb') as fd:
@ -186,9 +336,119 @@ def extract_rpm(name, path, target):
], stdin=rpm2cpio.stdout, stdout=subprocess.DEVNULL) ], stdin=rpm2cpio.stdout, stdout=subprocess.DEVNULL)
return rpm2cpio.wait() == 0 and cpio.wait() == 0 return rpm2cpio.wait() == 0 and cpio.wait() == 0
def parse_config(path): def get_dl_list(args, app, version_selector=VersionSelector.LATEST):
with open(path, 'r') as fd: full_candid = {}
return dict(line.rstrip('\n').split('=', 1) for line in fd) for template in args.templates:
# This will be merged into `full_candid` later.
# It is separated so that we can check whether it is empty.
candid = {}
# Skip local RPMs
if template.endswith('.rpm'):
continue
query_res = qrexec_repoquery(args, app, PACKAGE_NAME_PREFIX + template)
# We only select one package for each distinct package name
# TODO: Check local VM is managed by qvm-template
for entry in query_res:
ver = (entry.epoch, entry.version, entry.release)
insert = False
if version_selector == VersionSelector.LATEST:
if entry.name not in candid \
or rpm.labelCompare(candid[entry.name][0], ver) < 0:
insert = True
elif version_selector == VersionSelector.REINSTALL:
if entry.name not in app.domains:
parser.error(
"Template '%s' not already installed." % entry.name)
vm = app.domains[entry.name]
cur_ver = query_local_evr(vm)
if rpm.labelCompare(ver, cur_ver) == 0:
insert = True
elif version_selector in [VersionSelector.LATEST_LOWER,
VersionSelector.LATEST_HIGHER]:
if entry.name not in app.domains:
parser.error(
"Template '%s' not already installed." % entry.name)
vm = app.domains[entry.name]
cur_ver = query_local_evr(vm)
cmp_res = -1 \
if version_selector == VersionSelector.LATEST_LOWER \
else 1
if rpm.labelCompare(ver, cur_ver) == cmp_res:
if entry.name not in candid \
or rpm.labelCompare(candid[entry.name][0], ver) < 0:
insert = True
if insert:
candid[entry.name] = DlEntry(ver, entry.reponame, entry.dlsize)
# XXX: As it's possible to include version information in `template`
# Perhaps the messages can be improved
if len(candid) == 0:
if version_selector == VersionSelector.LATEST:
parser.error('Template \'%s\' not found.' % template)
elif version_selector == VersionSelector.REINSTALL:
parser.error('Same version of template \'%s\' not found.' \
% template)
# Copy behavior of DNF and do nothing if version not found
elif version_selector == VersionSelector.LATEST_LOWER:
print(("Template '%s' of lowest version"
" already installed, skipping..." % template),
file=sys.stderr)
elif version_selector == VersionSelector.LATEST_HIGHER:
print(("Template '%s' of highest version"
" already installed, skipping..." % template),
file=sys.stderr)
# Merge & choose the template with the highest version
for name, entry in candid.items():
if name not in full_candid \
or rpm.labelCompare(full_candid[name].evr, entry.evr) < 0:
full_candid[name] = entry
return candid
def download(args, app, path_override=None,
dl_list=None, suffix='', version_selector=VersionSelector.LATEST):
if dl_list is None:
dl_list = get_dl_list(args, app, version_selector=version_selector)
path = path_override if path_override is not None else args.downloaddir
for name, entry in dl_list.items():
version_str = build_version_str(entry.evr)
spec = PACKAGE_NAME_PREFIX + name + '-' + version_str
target = os.path.join(path, '%s.rpm' % spec)
target_suffix = target + suffix
if suffix != '' and os.path.exists(target_suffix):
print('\'%s\' already exists, skipping...' % target,
file=sys.stderr)
if os.path.exists(target):
print('\'%s\' already exists, skipping...' % target,
file=sys.stderr)
if suffix != '':
os.rename(target, target_suffix)
else:
print('Downloading \'%s\'...' % spec, file=sys.stderr)
done = False
for attempt in range(args.retries):
try:
qrexec_download(args, app, spec, target_suffix,
entry.dlsize)
done = True
break
except ConnectionError:
os.remove(target_suffix)
if attempt + 1 < args.retries:
print('\'%s\' download failed, retrying...' % spec,
file=sys.stderr)
except:
# Also remove file if interrupted by other means
os.remove(target_suffix)
raise
if not done:
print('\'%s\' download failed.' % spec, file=sys.stderr)
sys.exit(1)
def install(args, app, version_selector=VersionSelector.LATEST, def install(args, app, version_selector=VersionSelector.LATEST,
override_existing=False): override_existing=False):
@ -339,156 +599,6 @@ def install(args, app, version_selector=VersionSelector.LATEST,
finally: finally:
os.remove(LOCK_FILE) os.remove(LOCK_FILE)
def qrexec_popen(args, app, service, stdout=subprocess.PIPE, filter_esc=True):
if args.updatevm:
return app.domains[args.updatevm].run_service(
service,
filter_esc=filter_esc,
stdout=stdout)
return subprocess.Popen([
'/etc/qubes-rpc/%s' % service,
],
stdin=subprocess.PIPE,
stdout=stdout,
stderr=subprocess.PIPE)
def qrexec_payload(args, app, spec, refresh):
_ = app # unused
# TODO: Check that spec != '---'
def check_newline(string, name):
if '\n' in string:
parser.error(f"Malformed {name}:" +
" argument should not contain '\\n'.")
payload = ''
for repo in args.enablerepo if args.enablerepo else []:
check_newline(repo, '--enablerepo')
payload += '--enablerepo=%s\n' % repo
for repo in args.disablerepo if args.disablerepo else []:
check_newline(repo, '--disablerepo')
payload += '--disablerepo=%s\n' % repo
for repo in args.repoid if args.repoid else []:
check_newline(repo, '--repoid')
payload += '--repoid=%s\n' % repo
if refresh:
payload += '--refresh\n'
check_newline(args.releasever, '--releasever')
payload += '--releasever=%s\n' % args.releasever
check_newline(spec, 'template name')
payload += spec + '\n'
payload += '---\n'
for path in args.repo_files:
with open(path, 'r') as fd:
payload += fd.read() + '\n'
return payload
def qrexec_repoquery(args, app, spec='*', refresh=False):
proc = qrexec_popen(args, app, 'qubes.TemplateSearch')
payload = qrexec_payload(args, app, spec, refresh)
stdout, stderr = proc.communicate(payload.encode('UTF-8'))
stdout = stdout.decode('ASCII')
if proc.wait() != 0:
for line in stderr.decode('ASCII').rstrip().split('\n'):
print('[Qrexec] %s' % line, file=sys.stderr)
raise ConnectionError("qrexec call 'qubes.TemplateSearch' failed.")
name_re = re.compile(r'^[A-Za-z0-9._+\-]*$')
evr_re = re.compile(r'^[A-Za-z0-9._+~]*$')
date_re = re.compile(r'^\d+-\d+-\d+ \d+:\d+$')
licence_re = re.compile(r'^[A-Za-z0-9._+\-()]*$')
result = []
for line in stdout.split('|\n'):
# Note that there's an empty entry at the end as .strip() is not used.
# This is because if .strip() is used, the .split() will not work.
if line == '':
continue
entry = line.split('|')
try:
# If there is an incorrect number of entries, raise an error
# Unpack manually instead of stuffing into `Template` right away
# so that it's easier to mutate stuff.
name, epoch, version, release, reponame, dlsize, \
buildtime, licence, url, summary, description = entry
# Ignore packages that are not templates
if not name.startswith(PACKAGE_NAME_PREFIX):
continue
name = name[len(PACKAGE_NAME_PREFIX):]
# Check that the values make sense
if not re.fullmatch(name_re, name):
raise ValueError
for val in [epoch, version, release]:
if not re.fullmatch(evr_re, val):
raise ValueError
if not re.fullmatch(name_re, reponame):
raise ValueError
dlsize = int(dlsize)
# First verify that the date does not look weird, then parse it
if not re.fullmatch(date_re, buildtime):
raise ValueError
buildtime = datetime.datetime.strptime(buildtime, '%Y-%m-%d %H:%M')
# XXX: Perhaps whitelist licenses directly?
if not re.fullmatch(licence_re, licence):
raise ValueError
# Check name actually matches spec
if not is_match_spec(name, epoch, version, release, spec):
continue
result.append(Template(name, epoch, version, release, reponame,
dlsize, buildtime, licence, url, summary, description))
except (TypeError, ValueError):
raise ConnectionError(("qrexec call 'qubes.TemplateSearch' failed:"
" unexpected data format."))
return result
def qrexec_download(args, app, spec, path, dlsize=None, refresh=False):
with open(path, 'wb') as fd:
# Don't filter ESCs for binary files
proc = qrexec_popen(args, app, 'qubes.TemplateDownload',
stdout=fd, filter_esc=False)
payload = qrexec_payload(args, app, spec, refresh)
proc.stdin.write(payload.encode('UTF-8'))
proc.stdin.close()
with tqdm.tqdm(desc=spec, total=dlsize, unit_scale=True,
unit_divisor=1000, unit='B') as pbar:
last = 0
while proc.poll() is None:
cur = fd.tell()
pbar.update(cur - last)
last = cur
time.sleep(0.1)
if proc.wait() != 0:
raise ConnectionError(
"qrexec call 'qubes.TemplateDownload' failed.")
return True
def build_version_str(evr):
return '%s:%s-%s' % evr
def is_match_spec(name, epoch, version, release, spec):
# Refer to "NEVRA Matching" in the DNF documentation
# NOTE: Currently "arch" is ignored as the templates should be of "noarch"
if epoch != 0:
targets = [
f'{name}-{epoch}:{version}-{release}',
f'{name}',
f'{name}-{epoch}:{version}'
]
else:
targets = [
f'{name}-{epoch}:{version}-{release}',
f'{name}-{version}-{release}',
f'{name}',
f'{name}-{epoch}:{version}',
f'{name}-{version}'
]
for prio, target in enumerate(targets):
if fnmatch.fnmatch(target, spec):
return True, prio
return False, float('inf')
def list_templates(args, app, operation): def list_templates(args, app, operation):
tpl_list = [] tpl_list = []
@ -664,120 +774,6 @@ def search(args, app):
print('===', cur_header, '===') print('===', cur_header, '===')
print(query_res[idx].name, ':', query_res[idx].summary) print(query_res[idx].name, ':', query_res[idx].summary)
def get_dl_list(args, app, version_selector=VersionSelector.LATEST):
full_candid = {}
for template in args.templates:
# This will be merged into `full_candid` later.
# It is separated so that we can check whether it is empty.
candid = {}
# Skip local RPMs
if template.endswith('.rpm'):
continue
query_res = qrexec_repoquery(args, app, PACKAGE_NAME_PREFIX + template)
# We only select one package for each distinct package name
# TODO: Check local VM is managed by qvm-template
for entry in query_res:
ver = (entry.epoch, entry.version, entry.release)
insert = False
if version_selector == VersionSelector.LATEST:
if entry.name not in candid \
or rpm.labelCompare(candid[entry.name][0], ver) < 0:
insert = True
elif version_selector == VersionSelector.REINSTALL:
if entry.name not in app.domains:
parser.error(
"Template '%s' not already installed." % entry.name)
vm = app.domains[entry.name]
cur_ver = query_local_evr(vm)
if rpm.labelCompare(ver, cur_ver) == 0:
insert = True
elif version_selector in [VersionSelector.LATEST_LOWER,
VersionSelector.LATEST_HIGHER]:
if entry.name not in app.domains:
parser.error(
"Template '%s' not already installed." % entry.name)
vm = app.domains[entry.name]
cur_ver = query_local_evr(vm)
cmp_res = -1 \
if version_selector == VersionSelector.LATEST_LOWER \
else 1
if rpm.labelCompare(ver, cur_ver) == cmp_res:
if entry.name not in candid \
or rpm.labelCompare(candid[entry.name][0], ver) < 0:
insert = True
if insert:
candid[entry.name] = DlEntry(ver, entry.reponame, entry.dlsize)
# XXX: As it's possible to include version information in `template`
# Perhaps the messages can be improved
if len(candid) == 0:
if version_selector == VersionSelector.LATEST:
parser.error('Template \'%s\' not found.' % template)
elif version_selector == VersionSelector.REINSTALL:
parser.error('Same version of template \'%s\' not found.' \
% template)
# Copy behavior of DNF and do nothing if version not found
elif version_selector == VersionSelector.LATEST_LOWER:
print(("Template '%s' of lowest version"
" already installed, skipping..." % template),
file=sys.stderr)
elif version_selector == VersionSelector.LATEST_HIGHER:
print(("Template '%s' of highest version"
" already installed, skipping..." % template),
file=sys.stderr)
# Merge & choose the template with the highest version
for name, entry in candid.items():
if name not in full_candid \
or rpm.labelCompare(full_candid[name].evr, entry.evr) < 0:
full_candid[name] = entry
return candid
def download(args, app, path_override=None,
dl_list=None, suffix='', version_selector=VersionSelector.LATEST):
if dl_list is None:
dl_list = get_dl_list(args, app, version_selector=version_selector)
path = path_override if path_override is not None else args.downloaddir
for name, entry in dl_list.items():
version_str = build_version_str(entry.evr)
spec = PACKAGE_NAME_PREFIX + name + '-' + version_str
target = os.path.join(path, '%s.rpm' % spec)
target_suffix = target + suffix
if suffix != '' and os.path.exists(target_suffix):
print('\'%s\' already exists, skipping...' % target,
file=sys.stderr)
if os.path.exists(target):
print('\'%s\' already exists, skipping...' % target,
file=sys.stderr)
if suffix != '':
os.rename(target, target_suffix)
else:
print('Downloading \'%s\'...' % spec, file=sys.stderr)
done = False
for attempt in range(args.retries):
try:
qrexec_download(args, app, spec, target_suffix,
entry.dlsize)
done = True
break
except ConnectionError:
os.remove(target_suffix)
if attempt + 1 < args.retries:
print('\'%s\' download failed, retrying...' % spec,
file=sys.stderr)
except:
# Also remove file if interrupted by other means
os.remove(target_suffix)
raise
if not done:
print('\'%s\' download failed.' % spec, file=sys.stderr)
sys.exit(1)
def remove(args, app): def remove(args, app):
_ = args, app # unused _ = args, app # unused
@ -804,7 +800,9 @@ def main(args=None, app=None):
if args.refresh: if args.refresh:
qrexec_repoquery(args, app, refresh=True) qrexec_repoquery(args, app, refresh=True)
if args.operation == 'install': if args.operation == 'download':
download(args, app)
elif args.operation == 'install':
install(args, app) install(args, app)
elif args.operation == 'reinstall': elif args.operation == 'reinstall':
install(args, app, version_selector=VersionSelector.REINSTALL, install(args, app, version_selector=VersionSelector.REINSTALL,
@ -821,8 +819,6 @@ def main(args=None, app=None):
list_templates(args, app, 'info') list_templates(args, app, 'info')
elif args.operation == 'search': elif args.operation == 'search':
search(args, app) search(args, app)
elif args.operation == 'download':
download(args, app)
elif args.operation == 'remove': elif args.operation == 'remove':
remove(args, app) remove(args, app)
elif args.operation == 'clean': elif args.operation == 'clean':