$ git clone -n https://src.fedoraproject.org/rpms/rust-async-generic.git /var/lib/mock/f45-build-40270-770/root/chroot_tmpdir/scmroot/rust-async-generic
Cloning into '/var/lib/mock/f45-build-40270-770/root/chroot_tmpdir/scmroot/rust-async-generic'...
$ git fetch origin 355acdd1cacbee56942758c3db9ebd5990b7b3a5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-async-generic
 * [new ref]         355acdd1cacbee56942758c3db9ebd5990b7b3a5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 355acdd Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild