Cannot install luasec

[saucisson]

Since a few hours, http://luarocks.org redirects to https://luarocks.org. This prevents installing luasec within your docker image, as installing luasec now requires luasec already.

Here a simple Dockerfile showing the problem:

FROM erikcw/lapis
RUN luarocks install luasec OPENSSL_LIBDIR="/lib/x86_64-linux-gnu/"

And the error:

Step 1 : FROM erikcw/lapis
 ---> 69edd4eebf0c
Step 2 : RUN luarocks install luasec OPENSSL_LIBDIR="/lib/x86_64-linux-gnu/"
 ---> Running in ddb5f9a51888
Warning: Failed searching manifest: Failed loading manifest: Failed fetching manifest for http://luarocks.org/repositories/rocks - Error fetching file: Failed downloading http://luarocks.org/repositories/rocks/manifest - URL redirected to unsupported protocol - install luasec to get HTTPS support.

Error: No results matching query were found.
The command '/bin/sh -c luarocks install luasec OPENSSL_LIBDIR="/lib/x86_64-linux-gnu/"' returned a non-zero code: 1

Strangely, the problem does not occur when doing an install of lua and luarocks using hererocks:

$ hererocks -r^ -l^ lua-install
...
$ ./lua-install/bin/luarocks install luasec
...
luasec 0.6-1 is now built and installed in /Users/alinard/Temporary/lua-install (license: MIT)

[mpeterv]

Dockerfile installs luarocks from apt-get and gets an old version (2.0.9) as it's using ubuntu 14.04. Luarocks 2.0.9 default repo URL uses http://, causing the error. Since 2.2.0 Luarocks uses https:// for default repo, so that it immediately falls back to curl or wget if luasocket is installed but luasec isn't yet. Using ubuntu 16.04 in the image or manually installing a recent version of Luarocks should fix this.