问题
For offline linux machines without Internet, installing R packages with lots of dependencies is a nightmare. I found couple of posts in SE discussing on how to create a local folder, copy desired package zip files and install using 'install.packages'.
However, finding, downloading, and uploading lots of packages to an offline server is a time-consuming effort. So, I am wondering how can I download the entire zip file of all CRAN packages so I can put them in a http web server directory in my local offline machine and act like a real repository. The size probably will be very big around 200 GB, but for corporate environment, I think it should make sense.
I found a guide here discussing how to become an official CRAN mirror, but I am not going to be an official public mirror.
Please advise. Thanks in advance
回答1:
You can use the function available.packages to find the available packages.
pkgnames <- available.packages()[,1]
If you like web scraping you can practice as follows.
library(rvest)
pkgs <- read_html("https://cran.r-project.org/web/packages/available_packages_by_name.html")
tab <- html_nodes(pkgs, "table") %>% html_table(fill = TRUE)
pkgnames <- tab[[1]][1]$X1
pkgnames <- pkgnames[nchar(pkgnames)>0]
DON'T RUN THESE UNLESS YOU WANT TO INSTALL (OR DOWNLOAD) A LOT OF PACKAGES!!
#sapply(pkgnames, install.packages)
#sapply(pkgnames, install.packages)
You can run this line to show that it works.
sapply(pkgnames[1:2], install.packages)
You can replace the install.packages with download.packages along with the destdir argument to save it to your corporate directory.
来源：https://stackoverflow.com/questions/39051381/how-to-download-the-entire-cran-repository