$ git clone -n https://src.fedoraproject.org/rpms/rust-email-encoding.git /var/lib/mock/f40-build-2072272-49334/root/chroot_tmpdir/scmroot/rust-email-encoding
Cloning into '/var/lib/mock/f40-build-2072272-49334/root/chroot_tmpdir/scmroot/rust-email-encoding'...
$ git fetch origin 021621af5818aa043228a33e3366a9ca8ac70461:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-email-encoding
 * [new ref]         021621af5818aa043228a33e3366a9ca8ac70461 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 021621a Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild