你只有一个系统，却要在多个平台上测试你的R包

做为开发者，你必须是R CMD check经常跑的，但你只有一个平台，这就不好搞了，当然你可以用Travis (Linux, macOS) 或 Appveyor (Windows)，但是有更好的方法，你根本就不用离开你的R，不管你是那个系统下，你都可以将R CMD check跑在各种其它的系统上，然后就像在你自己的机器上跑一样，实时看到输出，检查是否那里有问题。

chk <- check_for_cran()
# wait a bit
chk$cran_summary()
#> Updating status...
#> ## Test environments
#> - R-hub fedora-clang-devel (r-devel)
#>  - R-hub windows-x86_64-devel (r-devel)
#>  - R-hub ubuntu-gcc-release (r-release)
#> 
#> ## R CMD check results
#> ❯ On fedora-clang-devel (r-devel), windows-x86_64-devel (r-devel), ubuntu-gcc-release (r-release)
#>   checking CRAN incoming feasibility ... NOTE
#>   Maintainer: ‘Maëlle Salmon <[e-mail]>’
#>   
#>   New submission
#>   
#>   The Description field contains
#>     <http://http://cran.r-project.org/doc/manuals/r-release/R-exts.html#The-DESCRIPTION-file>
#>   Please enclose URLs in angle brackets (<...>).
#>   
#>   The Date field is over a month old.
#> 
#> ❯ On fedora-clang-devel (r-devel), windows-x86_64-devel (r-devel), ubuntu-gcc-release (r-release)
#>   checking R code for possible problems ... NOTE
#>   .bello: no visible global function definition for ‘tail’
#>   Undefined global functions or variables:
#>     tail
#>   Consider adding
#>     importFrom("utils", "tail")
#>   to your NAMESPACE file.
#> 
#> 0 errors ✔ | 0 warnings ✔ | 2 notes ✖

支持各种平台，已经发行版和开发版的R

name	description	cran-name
debian-gcc-devel	Debian Linux, R-devel, GCC	r-devel-linux-x86_64-debian-gcc
debian-gcc-patched	Debian Linux, R-patched, GCC	r-patched-linux-x86_64
debian-gcc-release	Debian Linux, R-release, GCC	r-release-linux-x86_64
fedora-clang-devel	Fedora Linux, R-devel, clang, gfortran	r-devel-linux-x86_64-fedora-clang
fedora-gcc-devel	Fedora Linux, R-devel, GCC	r-devel-linux-x86_64-fedora-gcc
linux-x86_64-centos6-epel	CentOS 6, stock R from EPEL	r-release
linux-x86_64-centos6-epel-rdt	CentOS 6 with Redhat Developer Toolset, R from EPEL	r-release
linux-x86_64-rocker-gcc-san	Debian Linux, R-devel, GCC ASAN/UBSAN	r-devel
macos-elcapitan-release	macOS 10.11 El Capitan, R-release (experimental)	r-release-osx-x86_64
macos-mavericks-oldrel	macOS 10.9 Mavericks, R-oldrel (experimental)	r-oldrel-osx-x86_64
solaris-x86-patched	Oracle Solaris 10, x86, 32 bit, R-patched (experimental)	r-patched-solaris-x86
ubuntu-gcc-devel	Ubuntu Linux 16.04 LTS, R-devel, GCC	r-devel
ubuntu-gcc-release	Ubuntu Linux 16.04 LTS, R-release, GCC	r-release
ubuntu-rchk	Ubuntu Linux 16.04 LTS, R-devel with rchk	r-devel
windows-x86_64-devel	Windows Server 2008 R2 SP1, R-devel, 32/64 bit	r-devel
windows-x86_64-devel-rtools4	Windows Server 2012, R-devel, Rtools4.0, 32/64 bit (experimental)	r-devel
windows-x86_64-oldrel	Windows Server 2008 R2 SP1, R-oldrel, 32/64 bit	r-oldrel-windows-ix86+x86_64
windows-x86_64-patched	Windows Server 2008 R2 SP1, R-patched, 32/64 bit	r-patched
windows-x86_64-release	Windows Server 2008 R2 SP1, R-release, 32/64 bit	r-release-windows-ix86+x86_64

免费，而且是开源的

rhub：https://github.com/r-hub/ 就是github上，它是开源的，而且服务是免费的。

其实还能有别的用处

早在三年前，《无中生有windows版R包》中，我已经演示了另一种rhub的用法，那就是使用这些平台来打R包，当年我只有Mac和Linux系统，然后我用rhub来生成Windows版本的R包，方便其他用户下载安装。

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