$ git clone -n https://src.fedoraproject.org/rpms/rubygem-em-websocket-client.git /var/lib/mock/f38-build-side-42-init-devel-592917-26147/root/chroot_tmpdir/scmroot/rubygem-em-websocket-client
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-592917-26147/root/chroot_tmpdir/scmroot/rubygem-em-websocket-client'...
$ git fetch origin b2ae5e5b84f73b6744d6270088e3ab6629bf546c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-em-websocket-client
 * [new ref]         b2ae5e5b84f73b6744d6270088e3ab6629bf546c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b2ae5e5 Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild