$ git clone -n https://src.fedoraproject.org/rpms/R-shiny.git /var/lib/mock/f40-build-1514405-23911/root/chroot_tmpdir/scmroot/R-shiny
Cloning into '/var/lib/mock/f40-build-1514405-23911/root/chroot_tmpdir/scmroot/R-shiny'...
$ git fetch origin 859ed8921d2622c09b053bf5ba091016b7de0fec:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-shiny
 * [new ref]         859ed8921d2622c09b053bf5ba091016b7de0fec -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 859ed89 R-maint-sig mass rebuild