install specific package version

[Moritz Beber]

Hi,

With regard to my other post (https://groups.google.com/forum/#!topic/packrat-discuss/CCllnwAp6ZE) I decided to write my own scripts.

I'm currently tackling the problem of installing specific versions of scripts. I found a decent gist that does this (https://gist.github.com/viking/1503736) but packrat must already have a solution to this problem as well since you can bootstrap a project from a packrat.lock file without the sources directory. So is there a function within packrat that I can use for this purpose?

Thanks in advance,
Moritz

[Stéphane Laurent]

Same question... how to install for example an older version of ggplot2 ?

[Stéphane Laurent]

Useful info here, but not related to packrat: https://support.rstudio.com/hc/en-us/articles/219949047-Installing-older-versions-of-packages 

devtools::install_version(...) works fine, but this requires to add devtools to my packrat project ?

Installing from source should work, but this does not install the dependencies.

[Stéphane Laurent]

devtools::install_version(...) works fine, but this requires to add devtools to my packrat project ?

Hmm I see. One can install devtools in the library lib-r, then use devtools::install_version.

[Kevin Ushey]

Unfortunately, the packrat code that handles this is not yet exposed, but you can see what packrat does here (the code is unfortunately not nearly as clear as it could be):

https://github.com/rstudio/packrat/blob/80f8184c637c6c3e2a8bb371924b8b07667a9db3/R/restore.R#L161-L180

The general idea, though, is given a package name + version, you want to:

1. First check if the package is 'current'; this can usually be checked by comparing the relevant values in the output of `available.packages()`,

2. If that doesn't work, try constructing an appropriate URL to the CRAN archives, and downloading from that location.

Also note complications re: downloading package binaries vs. package sources; you might need to ensure that the 'pkgType' option is set to 'source' if you want sources (e.g. for the 'available.packages()' output).

Kevin

On Tue, Dec 6, 2016 at 10:18 AM, 'Stéphane Laurent' via packrat-discuss <packrat...@googlegroups.com> wrote:

devtools::install_version(...) works fine, but this requires to add devtools to my packrat project ?

Hmm I see. One can install devtools in the library lib-r, then use devtools::install_version.

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[Ronald Reck]

I too am interested in determining exactly the packages and versions I have installed and recreating (here and elsewhere) them non-interactively. I am new to packrat and will have test to see if I can do what I am thinking about.