$ git clone -n https://src.fedoraproject.org/rpms/rust-serde_with_macros1.git /var/lib/mock/f40-build-2288361-55782/root/chroot_tmpdir/scmroot/rust-serde_with_macros1
Cloning into '/var/lib/mock/f40-build-2288361-55782/root/chroot_tmpdir/scmroot/rust-serde_with_macros1'...
$ git fetch origin 7e27bb1a2401f195f97542f631a3cad40fc3e36e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-serde_with_macros1
 * [new ref]         7e27bb1a2401f195f97542f631a3cad40fc3e36e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7e27bb1 Initial import (serde_with_macros 1 compat package)