$ git clone -n https://src.fedoraproject.org/rpms/materia-gtk-theme.git /var/lib/mock/f40-build-2076880-49547/root/chroot_tmpdir/scmroot/materia-gtk-theme
Cloning into '/var/lib/mock/f40-build-2076880-49547/root/chroot_tmpdir/scmroot/materia-gtk-theme'...
$ git fetch origin 90083c5c294dbf240f657931e5fc3aee4be63c5d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/materia-gtk-theme
 * [new ref]         90083c5c294dbf240f657931e5fc3aee4be63c5d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 90083c5 Convert to %autorelease and %autochangelog