$ git clone -n https://src.fedoraproject.org/rpms/rust-allocator-api2.git /var/lib/mock/f45-build-40021-767/root/chroot_tmpdir/scmroot/rust-allocator-api2
Cloning into '/var/lib/mock/f45-build-40021-767/root/chroot_tmpdir/scmroot/rust-allocator-api2'...
$ git fetch origin ac8c2f758e9368986e8695d564de4f7c689c86e0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-allocator-api2
 * [new ref]         ac8c2f758e9368986e8695d564de4f7c689c86e0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ac8c2f7 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild