rhel-9.6: Fixes for RHEL-49670 (bootc error message)

dnf/cli/cli.py

@@ -214,6 +214,15 @@ def do_transaction(self, display=()):
             elif 'test' in self.conf.tsflags:
                 logger.info(_("{prog} will only download packages, install gpg keys, and check the "
                               "transaction.").format(prog=dnf.util.MAIN_PROG_UPPER))
+            if dnf.util._is_bootc_host() and \
+                    os.path.realpath(self.conf.installroot) == "/":
+                _bootc_host_msg = _("""
+*** Error: system is configured to be read-only; for more
+*** information run `bootc --help`.
+""")
+                logger.info(_bootc_host_msg)
+                raise CliError(_("Operation aborted."))
+
             if self._promptWanted():
                 if self.conf.assumeno or not self.output.userconfirm():
                     raise CliError(_("Operation aborted."))

dnf/util.py

@@ -631,3 +631,17 @@ def _tsi_or_pkg_nevra_cmp(item1, item2):
 def _name_unset_wrapper(input_name):
     # returns <name-unset> for everything that evaluates to False (None, empty..)
     return input_name if input_name else _("<name-unset>")
+
+
+def _is_bootc_host():
+    """Returns true is the system is managed as an immutable container,
+       false otherwise.  If msg is True, a warning message is displayed
+       for the user.
+    """
+    ostree_booted = '/run/ostree-booted'
+    usr = '/usr/'
+    # Check if usr is writtable and we are in a running ostree system.
+    # We want this code to return true only when the system is in locked state. If someone ran
+    # bootc overlay or ostree admin unlock we would want normal DNF path to be ran as it will be
+    # temporary changes (until reboot).
+    return os.path.isfile(ostree_booted) and not os.access(usr, os.W_OK)