$ git clone -n https://src.fedoraproject.org/rpms/prosody.git /var/lib/mock/f42-build-862660-170997/root/chroot_tmpdir/scmroot/prosody
Cloning into '/var/lib/mock/f42-build-862660-170997/root/chroot_tmpdir/scmroot/prosody'...
$ git fetch origin a371ad3f08b121d60e439ef02650734dff43a0c9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/prosody
 * [new ref]         a371ad3f08b121d60e439ef02650734dff43a0c9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a371ad3 Rebuild for ICU 76