$ git clone -n https://src.fedoraproject.org/rpms/perl-X-Tiny.git /var/lib/mock/f45-build-27404-624/root/chroot_tmpdir/scmroot/perl-X-Tiny
Cloning into '/var/lib/mock/f45-build-27404-624/root/chroot_tmpdir/scmroot/perl-X-Tiny'...
$ git fetch origin 21ae5b8ac50c4604883a362f9728ceab9d39edc7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-X-Tiny
 * [new ref]         21ae5b8ac50c4604883a362f9728ceab9d39edc7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 21ae5b8 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild