Add --releasever-major and --releasever-minor options

Allows the user to override the $releasever_major and $releasever_minor
variables on the command line, like --releasever.

dnf/cli/cli.py

@@ -816,7 +816,7 @@ def configure(self, args, option_parser=None):
                                           dnf.conf.PRIO_DEFAULT)
                 self.demands.cacheonly = True
             self.base.conf._configure_from_options(opts)
-            self._read_conf_file(opts.releasever)
+            self._read_conf_file(opts.releasever, opts.releasever_major, opts.releasever_minor)
             if 'arch' in opts:
                 self.base.conf.arch = opts.arch
             self.base.conf._adjust_conf_options()
@@ -925,7 +925,7 @@ def configure(self, args, option_parser=None):
                       )
                 )
 
-    def _read_conf_file(self, releasever=None):
+    def _read_conf_file(self, releasever=None, releasever_major=None, releasever_minor=None):
         timer = dnf.logging.Timer('config')
         conf = self.base.conf
 
@@ -953,18 +953,23 @@ def _read_conf_file(self, releasever=None):
         subst.update_from_etc(from_root, varsdir=conf._get_value('varsdir'))
 
         # cachedir, logs, releasever, and gpgkey are taken from or stored in installroot
-        major = None
-        minor = None
+
+        det_major = None
+        det_minor = None
         if releasever is None and conf.releasever is None:
-            releasever, major, minor = dnf.rpm.detect_releasevers(conf.installroot)
+            releasever, det_major, det_minor = dnf.rpm.detect_releasevers(conf.installroot)
         elif releasever == '/':
-            releasever, major, minor = dnf.rpm.detect_releasevers(releasever)
-        if releasever is not None:
-            conf.releasever = releasever
-            if major is not None:
-                conf.releasever_major = major
-            if minor is not None:
-                conf.releasever_minor = minor
+            releasever, det_major, det_minor = dnf.rpm.detect_releasevers(releasever)
+
+        def or_else(*args):
+            for arg in args:
+                if arg is not None:
+                    return arg
+            return None
+        conf.releasever = or_else(releasever, conf.releasever)
+        conf.releasever_major = or_else(releasever_major, det_major, conf.releasever_major)
+        conf.releasever_minor = or_else(releasever_minor, det_minor, conf.releasever_minor)
+
         if conf.releasever is None:
             logger.warning(_("Unable to detect release version (use '--releasever' to specify "
                              "release version)"))

dnf/cli/option_parser.py

@@ -199,6 +199,12 @@ def _add_general_options(self):
         general_grp.add_argument("--releasever", default=None,
                                  help=_("override the value of $releasever"
                                         " in config and repo files"))
+        general_grp.add_argument("--releasever-major", default=None,
+                                 help=_("override the value of $releasever_major"
+                                        " in config and repo files"))
+        general_grp.add_argument("--releasever-minor", default=None,
+                                 help=_("override the value of $releasever_minor"
+                                        " in config and repo files"))
         general_grp.add_argument("--setopt", dest="setopts", default=[],
                                  action=self._SetoptsCallback,
                                  help=_("set arbitrary config and repo options"))

doc/command_ref.rst

@@ -335,6 +335,14 @@ Options
     Configure DNF as if the distribution release was ``<release>``. This can
     affect cache paths, values in configuration files and mirrorlist URLs.
 
+``--releasever_major=<major version>``
+    Override the releasever_major variable, which is usually automatically
+    detected or taken from the part of ``$releasever`` before the first ``.``.
+
+``--releasever_minor=<minor version>``
+    Override the releasever_minor variable, which is usually automatically
+    detected or taken from the part of ``$releasever`` after the first ``.``.
+
 .. _repofrompath_options-label:
 
 

doc/conf_ref.rst

@@ -492,6 +492,8 @@ configuration file by your distribution to override the DNF defaults.
 
     The ``$releasever_major`` and ``$releasever_minor`` variables will be automatically derived from ``$releasever`` by splitting it on the first ``.``. For example, if ``$releasever`` is set to ``1.23``, then ``$releasever_major`` will be ``1`` and ``$releasever_minor`` will be ``23``.
 
+    ``$releasever_major`` and ``$releasever_minor`` can also be set by the distribution.
+
     See also :ref:`repo variables <repo-variables-label>`.
 
 .. _reposdir-label: