$ git clone -n https://src.fedoraproject.org/rpms/perl-ExtUtils-CBuilder.git /var/lib/mock/f45-build-23405-597/root/chroot_tmpdir/scmroot/perl-ExtUtils-CBuilder
Cloning into '/var/lib/mock/f45-build-23405-597/root/chroot_tmpdir/scmroot/perl-ExtUtils-CBuilder'...
$ git fetch origin f332defc10513c39121750bc4f5d832be84bd6a6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-ExtUtils-CBuilder
 * [new ref]         f332defc10513c39121750bc4f5d832be84bd6a6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f332def Increase release to favour standalone package