$ git clone -n https://src.fedoraproject.org/rpms/rust-rocket.git /var/lib/mock/f42-build-3264622-41245/root/chroot_tmpdir/scmroot/rust-rocket
Cloning into '/var/lib/mock/f42-build-3264622-41245/root/chroot_tmpdir/scmroot/rust-rocket'...
$ git fetch origin eaa5c8735d7429fecfb5b7029816c18b90487fe3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-rocket
 * [new ref]         eaa5c8735d7429fecfb5b7029816c18b90487fe3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at eaa5c87 Rebuilt for https://fedoraproject.org/wiki/Fedora_42_Mass_Rebuild