Bake installer script support for Linux / Windows

[mobileoverlord]

The bake installer script should be moved out of bakeware and into bake. It should also be written in elixir instead of ruby. This will allow us to ensure that the host machine you are installing bake onto has elixir installed to support running the escript.

The installer script should also perform the tasks if

• Install fwup
• Install squashfs tools
• Configure BAKE_HOME and associated directories
• Install bake

These tasks should be tailored to run properly on windows and linux in addition to mac os

[kfatehi]

So far I've found this to work everywhere:

elixir -e "~s(https://gist.githubusercontent.com/kfatehi/12dc743ce2de71a107df/raw/43928a9634a207ea3944a1a82e1837241064932d/install.exs) |> Mix.Utils.read_path() |> elem(1) |> Code.eval_string()"

At this point it feels safe enough to start porting the ruby to elixir and then use the above as the delivery method. Thoughts?

Note: I had to use sigil for the URL string literal due to cross platform escaping inconsistency.

[kfatehi]

Actually, this is better, because it uses checksum and runs code only if it passes, and displays the checksum error otherwise:

# good checksum
$ elixir -e "case ~s(http://localhost:8000/install.exs) |> Mix.Utils.read_path(sha512: ~s(45b8ba592d816dbe56e58aaacf6378e9509a16acd3654f39ce7ee04af8696d0cc365f0a9aeee779d22506b8a5ca9590d1176df6dbabaf1477d16bfb25a2e0dd8)) do {:ok, code} -> code end |> Code.eval_string()"
helo wordl

#bad checksum
$ elixir -e "case ~s(http://localhost:8000/install.exs) |> Mix.Utils.read_path(sha512: ~s(123)) do {:ok, code} -> code end |> Code.eval_string()"
** (CaseClauseError) no case clause matching: {:checksum, "Data does not match the given sha512 checksum.\n\nExpected: 123\n  Actual: 45b8ba592d816dbe56e58aaacf6378e9509a16acd3654f39ce7ee04af8696d0cc365f0a9aeee779d22506b8a5ca9590d1176df6dbabaf1477d16bfb25a2e0dd8\n"}
    (stdlib) :erl_eval.expr/3
    (elixir) lib/code.ex:168: Code.eval_string/3

[kfatehi]

The install script works on all platforms. Check out the README at https://github.com/kfatehi/bake_install

The readme file is autogenerated by the default make task defined in the makefile. I did this so that it autogenerates the correct command with the sha512 of the install script.

[fhunleth]

I think this is really cool. My only complaint is that go_untar.exe is needed. The bake-0.1.1.tar.gz file is 6,245,404 bytes. bake is 6,290,427 bytes, so compression doesn't buy much. Any reservations on just downloading bake? Or if it's anticipated that bake has more files, maybe use the ZIP format and uncompress in Elixir via :zip.unzip/1?

[mobileoverlord]

Well, erlang has a built in tar tool. We could just resort to using that. I have it in BakeUtils. I think we need to go after a solution which uses tar because it's needed for in archiving systems and toolchains

[fhunleth]

Even better.

[RaulRG]

I tried the Elixir script in a Linux machine (Ubuntu 15) and didn't work for me. I used apt-get to install Elixir (and of course Erlang) but the function Mix.Utils.read_path() could not be found. I am new to Erlang / Elixir so that I don't know if it is something stupid on my side :-)

The only thing that looks strange for me is that apt-get installed a "1.1.0-development" version (or something like this) of Elixir. It seems that there are no 1.2 packages.