$ git clone -n https://src.fedoraproject.org/rpms/gap-pkg-circle.git /var/lib/mock/f38-build-side-42-init-devel-656233-26596/root/chroot_tmpdir/scmroot/gap-pkg-circle
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-656233-26596/root/chroot_tmpdir/scmroot/gap-pkg-circle'...
$ git fetch origin daba6ccc245e851ce8bacd96bc93d411e207ab18:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gap-pkg-circle
 * [new ref]         daba6ccc245e851ce8bacd96bc93d411e207ab18 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at daba6cc Version 1.6.6.