Fix obsoletes and provides

Make sure to provide the old names that other packages require so that
the upgrade path from libpeas 1.36 works correctly.

libpeas1.spec

@@ -24,6 +24,11 @@ BuildRequires:  pkgconfig(gtk+-3.0)
 BuildRequires:  pkgconfig(pygobject-3.0)
 BuildRequires:  python3-devel
 
+# Conflict with the old libpeas version to avoid potential file conflicts on
+# upgrade, but don't obsolete it so that the correct version (libpeas 2 or
+# libpeas1) is pulled in through package dependencies.
+Conflicts:      libpeas < 2.0
+
 %description
 libpeas1 is a convenience library making adding plug-ins support
 to glib-based applications. For the version based on newer GLib, see the
@@ -33,12 +38,15 @@ libpeas package.
 Summary:        GTK+ 3 plug-ins support for libpeas1
 Requires:       %{name}%{?_isa} = %{version}-%{release}
 
-# As this package was renamed after 1.36.0, obsolete the original package name
+# Handle the upgrade path for the -gtk subpackage that moved from libpeas
-# of its first version (libpeas 2, in other words, 1.99.0).
+# package to libpeas1 compat package when the main libpeas package was updated
-Obsoletes: libpeas-gtk < 1.99.0-1
+# to version 2.0. New libpeas 2.0 no longer provides the GTK API, which makes
-# Provide the original version 1 API package name. libpeas 2 does not provide a
+# the upgrade path easier as this compat package can fully replace the old
-# GTK API, so there is no overlap here.
+# name.
-Provides: libpeas-gtk = %{version}-%{release}
+Obsoletes:      libpeas-gtk < 2.0
+Conflicts:      libpeas-gtk < 2.0
+Provides:       libpeas-gtk = %{version}-%{release}
+Provides:       libpeas-gtk%{?_isa} = %{version}-%{release}
 
 %description gtk
 libpeas1-gtk is a convenience library making adding plug-ins support
@@ -49,12 +57,16 @@ Summary:        Python 3 loader for libpeas1
 Requires:       %{name}%{?_isa} = %{version}-%{release}
 Requires:       python3-gobject
 
-# As this package was renamed after 1.36.0, obsolete the original package name
+# Handle the upgrade path for the -python3 subpackage that moved from libpeas
-# of its first version (libpeas 2, in other words, 1.99.0).
+# package to libpeas1 compat package when the main libpeas package was updated
-Obsoletes: libpeas-loader-python3 < 1.99.0-1
+# to version 2.0. New libpeas 2.0 still provides a python loader, but it's now
-# Provide only the version 1 API package name. Nothing in Fedora depends on the
+# installed under 'libpeas-loader-python' name, which makes it convenient
-# unversioned package name, anyway.
+# because libpeas1-loader-python3 can fully replace libpeas-loader-python3
-Provides: libpeas1-loader-python3 = %{version}-%{release}
+# (note the python vs python3).
+Obsoletes:      libpeas-loader-python3 < 2.0
+Conflicts:      libpeas-loader-python3 < 2.0
+Provides:       libpeas-loader-python3 = %{version}-%{release}
+Provides:       libpeas-loader-python3%{?_isa} = %{version}-%{release}
 
 %description loader-python3
 This package contains the Python 3 loader that is needed to
@@ -69,10 +81,11 @@ Requires:       %{name}-gtk%{?_isa} = %{version}-%{release}
 # this metapackage to ensure the proper system fonts are present.
 Recommends:     gi-docgen-fonts
 
-# As this package was renamed after 1.36.0, obsolete the original package name
+# Transition libpeas-devel 1.36 users to the compat package, and conflict with
-# of its first version (libpeas 2, in other words, 1.99.0).
+# the old libpeas-devel version to avoid potential file conflicts on upgrade if
-Obsoletes: libpeas-devel < 1.99.0-1
+# dnf's obsoletes processing should be disabled.
-# Not a direct replacement, so no Provides.
+Obsoletes:      libpeas-devel < 2.0
+Conflicts:      libpeas-devel < 2.0
 
 %description devel
 This package contains development libraries and header files