$ git clone -n https://src.fedoraproject.org/rpms/R-stringi.git /var/lib/mock/f40-build-780014-130656/root/chroot_tmpdir/scmroot/R-stringi
Cloning into '/var/lib/mock/f40-build-780014-130656/root/chroot_tmpdir/scmroot/R-stringi'...
$ git fetch origin 53d213f3a5d2b80c11d471ead1888678a0df37b2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-stringi
 * [new ref]         53d213f3a5d2b80c11d471ead1888678a0df37b2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 53d213f Rebuild for ICU 74