$ git clone -n https://src.fedoraproject.org/rpms/rust-hostname.git /var/lib/mock/f40-build-2082394-49836/root/chroot_tmpdir/scmroot/rust-hostname
Cloning into '/var/lib/mock/f40-build-2082394-49836/root/chroot_tmpdir/scmroot/rust-hostname'...
$ git fetch origin fc2826d4ef4caf51d20cc3d5a23a4c9e521f0b10:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-hostname
 * [new ref]         fc2826d4ef4caf51d20cc3d5a23a4c9e521f0b10 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fc2826d Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild