r_jupyter package is broken #24585
Description
First, when trying to sage -i r_jupyter, the install fails since the spkg-install script is not executable (apparently nobody tried to install that package for a while):
cd '/opt/sagemath/sage-source' && \
source '/opt/sagemath/sage-source/src/bin/sage-env' && \
sage-logger -p '/opt/sagemath/sage-source/build/pkgs/r_jupyter/spkg-install' /opt/sagemath/sage-source/logs/pkgs/r_jupyter.log
[r_jupyter] /opt/sagemath/sage-source/build/bin/sage-logger: line 89: /opt/sagemath/sage-source/build/pkgs/r_jupyter/spkg-install: Permission denied
Then, if i make that file executable, the script does not work at all:
[r_jupyter] Warning message:
[r_jupyter] package 'IRkernel' is not available (for R version 3.4.3)
[r_jupyter] > IRkernel::installspec()
[r_jupyter] Error in loadNamespace(name) : there is no package called 'IRkernel'
[r_jupyter] Calls: :: ... tryCatch -> tryCatchList -> tryCatchOne -> <Anonymous>
[r_jupyter] Execution halted
Documentation can be found at https://irkernel.github.io/installation/
We modify it so that the kernel is installed at the right place (otherwise it is installed in the user's ~/.local/share/jupyter/kernels/ir/ directory).
CC: @vbraun @EmmanuelCharpentier
Component: packages: optional
Keywords: sdl
Author: Thierry Monteil
Branch/Commit: 13ffffe
Reviewer: Emmanuel Charpentier
Issue created by migration from https://trac.sagemath.org/ticket/24585