$ git clone -n https://src.fedoraproject.org/rpms/rust-derive_builder0.9.git /var/lib/mock/f41-build-side-1-2928785-35102/root/chroot_tmpdir/scmroot/rust-derive_builder0.9
Cloning into '/var/lib/mock/f41-build-side-1-2928785-35102/root/chroot_tmpdir/scmroot/rust-derive_builder0.9'...
$ git fetch origin 1cd920fae3012a0bc1338459019e22403b764b56:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-derive_builder0.9
 * [new ref]         1cd920fae3012a0bc1338459019e22403b764b56 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1cd920f compat package no longer needed