$ git clone -n https://src.fedoraproject.org/rpms/rust-bytestring.git /var/lib/mock/f40-build-2640014-66385/root/chroot_tmpdir/scmroot/rust-bytestring
Cloning into '/var/lib/mock/f40-build-2640014-66385/root/chroot_tmpdir/scmroot/rust-bytestring'...
$ git fetch origin bcf022acad6ad3f72d28defc166008f26fda03ce:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-bytestring
 * [new ref]         bcf022acad6ad3f72d28defc166008f26fda03ce -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bcf022a Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild