$ git clone -n https://src.fedoraproject.org/rpms/rust-humansize1.git /var/lib/mock/f41-build-side-1-3098659-39333/root/chroot_tmpdir/scmroot/rust-humansize1
Cloning into '/var/lib/mock/f41-build-side-1-3098659-39333/root/chroot_tmpdir/scmroot/rust-humansize1'...
$ git fetch origin b0bd2a89c44c2670fe56b793d9c611053ab73b33:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-humansize1
 * [new ref]         b0bd2a89c44c2670fe56b793d9c611053ab73b33 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b0bd2a8 compat package no longer needed