$ git clone -n https://src.fedoraproject.org/rpms/rust-const_format.git /var/lib/mock/f41-build-side-1-2991775-36005/root/chroot_tmpdir/scmroot/rust-const_format
Cloning into '/var/lib/mock/f41-build-side-1-2991775-36005/root/chroot_tmpdir/scmroot/rust-const_format'...
$ git fetch origin 918b11ace70e756f650b99e38f6dc7372833b0e4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-const_format
 * [new ref]         918b11ace70e756f650b99e38f6dc7372833b0e4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 918b11a Update to version 0.2.33; Fixes RHBZ#2310360