$ git clone -n https://src.fedoraproject.org/rpms/rust-rustversion.git /var/lib/mock/f40-build-2063580-49167/root/chroot_tmpdir/scmroot/rust-rustversion
Cloning into '/var/lib/mock/f40-build-2063580-49167/root/chroot_tmpdir/scmroot/rust-rustversion'...
$ git fetch origin de0b2ed4c6e2436c743442919dbcd7a0b24a1984:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-rustversion
 * [new ref]         de0b2ed4c6e2436c743442919dbcd7a0b24a1984 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at de0b2ed Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild