$ git clone -n https://src.fedoraproject.org/rpms/libretls.git /var/lib/mock/f40-build-738440-107930/root/chroot_tmpdir/scmroot/libretls
Cloning into '/var/lib/mock/f40-build-738440-107930/root/chroot_tmpdir/scmroot/libretls'...
$ git fetch origin 8ef3596567cc52a3e4c053d59972cd67c8431884:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libretls
 * [new ref]         8ef3596567cc52a3e4c053d59972cd67c8431884 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8ef3596 Upgrade to 3.8.1 (#2243450)