$ git clone -n https://src.fedoraproject.org/rpms/perl-Image-Base.git /var/lib/mock/f45-build-24237-602/root/chroot_tmpdir/scmroot/perl-Image-Base
Cloning into '/var/lib/mock/f45-build-24237-602/root/chroot_tmpdir/scmroot/perl-Image-Base'...
$ git fetch origin 135e2d0f22665bcc864389adc4304683fadae92d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Image-Base
 * [new ref]         135e2d0f22665bcc864389adc4304683fadae92d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 135e2d0 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild