$ git clone -n https://src.fedoraproject.org/rpms/rust-language-tags.git /var/lib/mock/f40-build-2713906-72218/root/chroot_tmpdir/scmroot/rust-language-tags
Cloning into '/var/lib/mock/f40-build-2713906-72218/root/chroot_tmpdir/scmroot/rust-language-tags'...
$ git fetch origin 1be748bea6d3aced9c069b1f59420b04260321f0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-language-tags
 * [new ref]         1be748bea6d3aced9c069b1f59420b04260321f0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1be748b Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild