$ git clone -n https://src.fedoraproject.org/rpms/rust-openssl-macros.git /var/lib/mock/f45-build-43557-804/root/chroot_tmpdir/scmroot/rust-openssl-macros
Cloning into '/var/lib/mock/f45-build-43557-804/root/chroot_tmpdir/scmroot/rust-openssl-macros'...
$ git fetch origin ec4b448f20be83e4bfac815da8a86ef10d5147a6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-openssl-macros
 * [new ref]         ec4b448f20be83e4bfac815da8a86ef10d5147a6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ec4b448 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild