Use Epoch 1 for virt-dib subpackage (only).

Avoids upgrade path problems from old virt-dib package.

guestfs-tools.spec

@@ -26,7 +26,7 @@
 Summary:       Tools to access and modify virtual machine disk images
 Name:          guestfs-tools
 Version:       1.45.3
-Release:       3%{?dist}
+Release:       4%{?dist}
 License:       GPLv2+
 
 # Build only for architectures that have a kernel
@@ -199,6 +199,9 @@ Windows virtual machines.
 %package -n virt-dib
 Summary:       Safe and secure diskimage-builder replacement
 License:       GPLv2+
+# This subpackage (only) must have an Epoch of 1 because it
+# replaces a package in libguestfs which had an Epoch of 1.
+Epoch:         1
 
 Requires:      libguestfs-dib >= 1:1.45.2-1
 
@@ -402,6 +405,9 @@ end
 
 
 %changelog
+* Wed Apr 07 2021 Richard W.M. Jones <rjones@redhat.com> - 1.45.3-4
+- Use Epoch 1 for virt-dib subpackage (only).
+
 * Wed Mar 31 2021 Richard W.M. Jones <rjones@redhat.com> - 1.45.3-3
 - Add BR xorriso, needed to run the tests.