$ git clone -n https://src.fedoraproject.org/rpms/gap-pkg-browse.git /var/lib/mock/f38-build-side-42-init-devel-946660-28778/root/chroot_tmpdir/scmroot/gap-pkg-browse
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-946660-28778/root/chroot_tmpdir/scmroot/gap-pkg-browse'...
$ git fetch origin 3188cc4ab5ac32987613816530b692fa5fde42f0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gap-pkg-browse
 * [new ref]         3188cc4ab5ac32987613816530b692fa5fde42f0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3188cc4 Version 1.8.21.