$ git clone -n https://src.fedoraproject.org/rpms/rust-adler2.git /var/lib/mock/f45-build-39985-765/root/chroot_tmpdir/scmroot/rust-adler2
Cloning into '/var/lib/mock/f45-build-39985-765/root/chroot_tmpdir/scmroot/rust-adler2'...
$ git fetch origin 4865a8541298ba6a9536df0a098c1c8e06ba2d43:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-adler2
 * [new ref]         4865a8541298ba6a9536df0a098c1c8e06ba2d43 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4865a85 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild