$ git clone -n https://src.fedoraproject.org/rpms/rust-gzip-header.git /var/lib/mock/f40-build-2037042-48073/root/chroot_tmpdir/scmroot/rust-gzip-header
Cloning into '/var/lib/mock/f40-build-2037042-48073/root/chroot_tmpdir/scmroot/rust-gzip-header'...
$ git fetch origin 6e9060b34ba5db55479a453b150d412befb3bd30:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-gzip-header
 * [new ref]         6e9060b34ba5db55479a453b150d412befb3bd30 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6e9060b Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild