构建conda软件包时未定义cran_mirror

Question

I am trying to build an R package in conda using skeleton. After preparing the environment with the required packages, I execute the following commands

$ conda skeleton cran arules
$ conda build r-arules

The recipe files are generated and everything seems OK, but the build command results into the following error:

Adding in variants from internal_defaults
INFO:conda_build.variants:Adding in variants from internal_defaults
Attempting to finalize metadata for r-arules
INFO:conda_build.metadata:Attempting to finalize metadata for r-arules
Undefined Jinja2 variables remain (['cran_mirror', 'cran_mirror']). 
Please enable source downloading and try again.

I've been reading the documentation and searching the Web for a solution to this problem, without success, and I do not know what else to do. ¿Any ideas?

Notes : I've started following this tutorial: http://ihrke.github.io/conda.html but afterwards I have also checked the official conda documentation on building packages and other related docs. I have updated conda (= 4.5.2), as well as conda-build ( = 3.10.1)

Answer 1

I finally find out how to solve my issue in two different ways:

The most straight solution is to specify a cran url using --cran-url option when creating the recipse, as follows:

$ conda skeleton cran arules --cran-url https://mran.microsoft.com/snapshot/2018-01-01/

Another solution is to create a conda-build config file, using yaml . Inside that file we specify the cran mirror, for example:

cran_mirror: https://mran.microsoft.com/snapshot/2018-01-01/

And then, we should use option -m when creating the recipe

$ conda skeleton cran arules -m path/to/conda_build_config.yam

PD: It seems there will be a default cran mirror in the next release of conda-build , according to comments in this pull request