$ git clone -n https://src.fedoraproject.org/rpms/rust-cairo-rs.git /var/lib/mock/f42-build-side-1-3584352-46893/root/chroot_tmpdir/scmroot/rust-cairo-rs
Cloning into '/var/lib/mock/f42-build-side-1-3584352-46893/root/chroot_tmpdir/scmroot/rust-cairo-rs'...
$ git fetch origin b4dabb5fb51d04a5e47c45e9b46567c6458f0767:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-cairo-rs
 * [new ref]         b4dabb5fb51d04a5e47c45e9b46567c6458f0767 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b4dabb5 Update to version 0.20.10; Fixes RHBZ#2365868