$ git clone -n https://src.fedoraproject.org/rpms/libe-book.git /var/lib/mock/f40-build-2603589-63338/root/chroot_tmpdir/scmroot/libe-book
Cloning into '/var/lib/mock/f40-build-2603589-63338/root/chroot_tmpdir/scmroot/libe-book'...
$ git fetch origin 2fe58adbe7ac5da8bf040380fd35bb3bbb85a1f9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libe-book
 * [new ref]         2fe58adbe7ac5da8bf040380fd35bb3bbb85a1f9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2fe58ad Rebuild for ICU 74