$ git clone -n http://fedora.riscv.rocks:3000/rpms/R-rprintf.git /var/lib/mock/f41-build-838750-159764/root/chroot_tmpdir/scmroot/R-rprintf
Cloning into '/var/lib/mock/f41-build-838750-159764/root/chroot_tmpdir/scmroot/R-rprintf'...
$ git fetch origin 1ae1e78ced5ec7e635af35773ced6a2fa9b2c100:KOJI_FETCH_HEAD
From http://fedora.riscv.rocks:3000/rpms/R-rprintf
 * [new ref]         1ae1e78ced5ec7e635af35773ced6a2fa9b2c100 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1ae1e78 Enable bootstrap