$ git clone -n https://src.fedoraproject.org/rpms/rust-displaydoc.git /var/lib/mock/f39-build-1574995-37915/root/chroot_tmpdir/scmroot/rust-displaydoc
Cloning into '/var/lib/mock/f39-build-1574995-37915/root/chroot_tmpdir/scmroot/rust-displaydoc'...
$ git fetch origin b4f8443704e0286730decff4f3e7411fcb59f6bc:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-displaydoc
 * [new ref]         b4f8443704e0286730decff4f3e7411fcb59f6bc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b4f8443 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild