$ git clone -n https://src.fedoraproject.org/rpms/blt.git /var/lib/mock/f41-build-1046673-19094/root/chroot_tmpdir/scmroot/blt
Cloning into '/var/lib/mock/f41-build-1046673-19094/root/chroot_tmpdir/scmroot/blt'...
$ git fetch origin 3f60752f77868b398ad3f8c02ad6e2b7bf62383d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/blt
 * [new ref]         3f60752f77868b398ad3f8c02ad6e2b7bf62383d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3f60752 Eliminate use of obsolete %patchN syntax (#2283636)