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Support for {reinstall,downgrade,upgrade} operations.

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Requires QubesOS/qubes-issues#5946 to be resolved.
This commit is contained in:
WillyPillow 2020-07-12 23:02:07 +08:00
parent faef52e61a
commit 41323d004f
1 changed files with 85 additions and 15 deletions
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100
qubesadmin/tools/qvm_template.py
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@ -74,6 +74,12 @@ class TemplateState(enum.Enum):
EXTRA = 'extra'
UPGRADABLE = 'upgradable'
class VersionSelector(enum.Enum):
LATEST = enum.auto()
REINSTALL = enum.auto()
LATEST_LOWER = enum.auto()
LATEST_HIGHER = enum.auto()
# 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.
@ -117,7 +123,8 @@ def parse_config(path):
with open(path, 'r') as fd:
return dict(line.rstrip('\n').split('=', 1) for line in fd)
def install(args, app):
def install(args, app, version_selector=VersionSelector.LATEST,
ignore_existing=False):
# TODO: Lock, mentioned in the note above
transaction_set = rpm.TransactionSet()
@ -130,11 +137,11 @@ def install(args, app):
os.makedirs(args.cachedir, exist_ok=True)
dl_list = get_dl_list(args, app)
dl_list = get_dl_list(args, app, version_selector=version_selector)
dl_list_copy = dl_list.copy()
# Verify that the templates are not yet installed
for name, (ver, _) in dl_list.items():
if name in app.domains:
if not ignore_existing and name in app.domains:
print(('Template \'%s\' already installed, skipping...'
' (You may want to use the {reinstall,upgrade,downgrade}'
' operations.)') % name, file=sys.stderr)
@ -147,7 +154,8 @@ def install(args, app):
dl_list = dl_list_copy
download(args, app, path_override=args.cachedir,
dl_list=dl_list, suffix=UNVERIFIED_SUFFIX)
dl_list=dl_list, suffix=UNVERIFIED_SUFFIX,
version_selector=version_selector)
for rpmfile in rpm_list:
path = rpmfile + UNVERIFIED_SUFFIX
@ -166,7 +174,7 @@ def install(args, app):
name = package_name[len(PACKAGE_NAME_PREFIX):]
# Another check for already-downloaded RPMs
if name in app.domains:
if not ignore_existing and name in app.domains:
print(('Template \'%s\' already installed, skipping...'
' (You may want to use the {reinstall,upgrade,downgrade}'
' operations.)') % name, file=sys.stderr)
@ -342,28 +350,81 @@ def do_list(args, app):
qubesadmin.tools.print_table(tpl_list)
def get_dl_list(args, app):
candid = {}
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)
if len(query_res) == 0:
parser.error('Package \'%s\' not found.' % template)
sys.exit(1)
# We only select one (latest) package for each distinct package name
# We only select one package for each distinct package name
#pylint: disable=unused-variable
for name, epoch, version, release, reponame, dlsize, summary \
in query_res:
ver = (epoch, version, release)
if name not in candid or rpm.labelCompare(candid[name], ver) < 0:
candid[name] = (ver, int(dlsize))
if version_selector == VersionSelector.LATEST:
if name not in candid \
or rpm.labelCompare(candid[name], ver) < 0:
candid[name] = (ver, int(dlsize))
elif version_selector == VersionSelector.REINSTALL:
if name not in app.domains:
parser.error("Template '%s' not installed." % name)
vm = app.domains[name]
cur_ver = (
vm.features['template-epoch'],
vm.features['template-version'],
vm.features['template-release'])
if rpm.labelCompare(ver, cur_ver) == 0:
candid[name] = (ver, int(dlsize))
elif version_selector in [VersionSelector.LATEST_LOWER,
VersionSelector.LATEST_HIGHER]:
if name not in app.domains:
parser.error("Template '%s' not installed." % name)
vm = app.domains[name]
cur_ver = (
vm.features['template-epoch'],
vm.features['template-version'],
vm.features['template-release'])
cmp_res = -1 \
if version_selector == VersionSelector.LATEST_LOWER \
else 1
if rpm.labelCompare(ver, cur_ver) == cmp_res:
if name not in candid \
or rpm.labelCompare(candid[name], ver) < 0:
candid[name] = (ver, int(dlsize))
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)
elif version_selector == VersionSelector.LATEST_LOWER:
parser.error('Lower version of template \'%s\' not found.' \
% template)
elif version_selector == VersionSelector.LATEST_HIGHER:
parser.error('Higher version of template \'%s\' not found.' \
% template)
sys.exit(1)
# Merge & choose the template with the highest version
for name, (ver, dlsize) in candid.items():
if name not in full_candid \
or rpm.labelCompare(full_candid[name], ver) < 0:
full_candid[name] = (ver, dlsize)
return candid
def download(args, app, path_override=None, dl_list=None, suffix=''):
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)
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, (ver, dlsize) in dl_list.items():
@ -416,6 +477,15 @@ def main(args=None, app=None):
if args.operation == 'install':
install(args, app)
elif args.operation == 'reinstall':
install(args, app, version_selector=VersionSelector.REINSTALL,
ignore_existing=True)
elif args.operation == 'downgrade':
install(args, app, version_selector=VersionSelector.LATEST_LOWER,
ignore_existing=True)
elif args.operation == 'upgrade':
install(args, app, version_selector=VersionSelector.LATEST_HIGHER,
ignore_existing=True)
elif args.operation == 'list':
do_list(args, app)
elif args.operation == 'download':