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# Create a goal, which is a class that allows to add items for resolving into
# a transaction.
goal = libdnf5.base.Goal(base)
# Add an RPM package named "one" for installation into the goal.
goal.add_rpm_install("one")
# Resolve the goal, create a transaction object.
#
# The argument is `allow_erasing`, a flag indicating whether to allow removing
# packages in the resolved transaction.
transaction = goal.resolve()
# We can iterate over the resolved transaction and inspect the packages.
print("Resolved transaction:")
for tspkg in transaction.get_transaction_packages():
print(tspkg.get_package().get_nevra(), ": ",
libdnf5.base.transaction.transaction_item_action_to_string(tspkg.get_action()))
# This class demonstrates user-defined callbacks for the package downloads.
#
# The callbacks are implemented by inheriting from the callbacks base class
# and overriding its methods.
#
# We only override one of the callbacks here, see
# `libdnf5.repo.DownloadCallbacks` documentation for a complete list.
class PackageDownloadCallbacks(libdnf5.repo.DownloadCallbacks):
def mirror_failure(self, user_cb_data, msg, url=""):
print("Mirror failure: ", msg)
return 0
downloader_callbacks = PackageDownloadCallbacks()
base.set_download_callbacks(
libdnf5.repo.DownloadCallbacksUniquePtr(downloader_callbacks))
# Download the packages.
transaction.download()
# A class for defining the RPM transaction callbacks.
#
# Again, only a callback for when an RPM package installation starts, for a
# complete list of the callbacks see `libdnf5.rpm.TransactionCallbacks`
# documentation.
class TransactionCallbacks(libdnf5.rpm.TransactionCallbacks):
def install_start(self, item, total=0):
print(libdnf5.base.transaction.transaction_item_action_to_string(item.get_action()), " ",
item.get_package().get_nevra())
transaction_callbacks = TransactionCallbacks()
transaction_callbacks_ptr = libdnf5.rpm.TransactionCallbacksUniquePtr(
transaction_callbacks)
transaction.set_callbacks(transaction_callbacks_ptr)
# Add transaction metadata to be stored in the history database.
transaction.set_description("install package one")
# Run the transaction.
print("Running the transaction:")
transaction.run()
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