$ git clone -n https://src.fedoraproject.org/rpms/rust-git2_0.14.git /var/lib/mock/f40-build-2306631-57171/root/chroot_tmpdir/scmroot/rust-git2_0.14
Cloning into '/var/lib/mock/f40-build-2306631-57171/root/chroot_tmpdir/scmroot/rust-git2_0.14'...
$ git fetch origin ecd6457cef58681f59351d78cb10b92ff69e9544:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-git2_0.14
 * [new ref]         ecd6457cef58681f59351d78cb10b92ff69e9544 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ecd6457 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild