devtools :: install_github失败，并显示CA证书错误 [英] devtools::install_github fails with CA cert error

问题描述

当我尝试调用install_github时，出现以下错误（不仅针对此软件包，而且针对所有github软件包）：

When I try to call install_github, I get the following error (not just for this package, but for all github packages):

> install_github('ramnathv/slidify')
Downloading github repo ramnathv/slidify@master
Error in curl::curl_fetch_memory(url, handle = handle) :
Problem with the SSL CA cert (path? access rights?)

但是如果我直接使用RCurl使用ssl访问github，我不会遇到任何问题：

But if I use RCurl directly to access github with ssl, I don't get any problem:

>  x <- getBinaryURL(
          url='https://github.com/ramnathv/slidify/archive/master.zip',
          followlocation=1L
          )

正常工作，因此RCurl可以正确验证SSL证书并下载存档文件。

works with no errors, so RCurl can verify the SSL certificate properly and download the archive file.

> sessionInfo()
R version 3.2.1 (2015-06-18)
Platform: x86_64-pc-linux-gnu (64-bit)
Running under: Debian GNU/Linux 8 (jessie)

locale:
 [1] LC_CTYPE=en_US.utf8       LC_NUMERIC=C             
 [3] LC_TIME=en_US.utf8        LC_COLLATE=en_US.utf8    
 [5] LC_MONETARY=en_US.utf8    LC_MESSAGES=en_US.utf8   
 [7] LC_PAPER=en_US.utf8       LC_NAME=C                
 [9] LC_ADDRESS=C              LC_TELEPHONE=C           
 [11] LC_MEASUREMENT=en_US.utf8 LC_IDENTIFICATION=C      

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

other attached packages:
[1] RCurl_1.95-4.7 bitops_1.0-6   devtools_1.8.0

loaded via a namespace (and not attached):
 [1] httr_1.0.0      R6_2.1.0        magrittr_1.5    rversions_1.0.2
 [5] tools_3.2.1     curl_0.9.1      Rcpp_0.12.0     memoise_0.2.1  
 [9] xml2_0.1.1      stringi_0.5-5   git2r_0.10.1    stringr_1.0.0  
 [13] digest_0.6.8   

和

> curlVersion()

$age
[1] 3

$version
[1] "7.38.0"

$vesion_num
[1] 468480

$host
[1] "x86_64-pc-linux-gnu"

$features
   ipv6         ssl        libz        ntlm   asynchdns      spnego 
      1           4           8          16         128         256 
   largefile         idn tlsauth_srp     ntlm_wb 
    512        1024       16384       32768 

$ssl_version
[1] "OpenSSL/1.0.1k"

$ssl_version_num
[1] 0

$libz_version
[1] "1.2.8"

$protocols
[1] "dict"   "file"   "ftp"    "ftps"   "gopher" "http"   "https"  "imap"  
[9] "imaps"  "ldap"   "ldaps"  "pop3"   "pop3s"  "rtmp"   "rtsp"   "scp"   
[17] "sftp"   "smtp"   "smtps"  "telnet" "tftp"  

$ares
[1] ""

$ares_num
[1] 0

$libidn
[1] "1.29"

如果我使用 httr :: set_config（httr :: config（ssl_verifypee r = 0L）），那么我可以成功运行 install_github ，但我希望实际检查ssl证书。

If I use httr::set_config( httr::config( ssl_verifypeer = 0L ) ) then I can successfully run install_github but I would prefer to actually check ssl certificates.

有人可以提供解决方案吗？

Can anyone offer a solution?

推荐答案

最后弄清楚了

我安装了两个不同的ssl库，由于某种原因，针对libcurl4-openssl-dev构建的RCurl软件包和针对libcurl4-nss-dev构建的curl软件包，但是我只为openssl而不是nss安装了CA密钥。

I had two different ssl libraries installed and for some reason, the RCurl package built against libcurl4-openssl-dev and the curl package built against libcurl4-nss-dev, but I had only installed CA keys for openssl, not for nss.

我用 remove.packages（'curl'）解决了我的问题R中的code>然后退出R，然后从外壳 apt-get删除libcurl4-nss-dev 开始R和 install.packages（ 'curl'）

I solved my problem with remove.packages('curl') in R and then quitting R and from the shell apt-get remove libcurl4-nss-dev starting R and install.packages('curl')

我的错误导致了我的问题，那就是使用 RCurl测试SSL CA处理而不是 httr 或 curl ，这会使我很快意识到 curl 软件包链接到错误的SSL库。

My mistake, which led to my question, was to test the SSL CA handling using RCurl instead of httr or curl, which would have led me quickly to the fact that my curl package was linked to the wrong SSL library.

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