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100 lines
3.6 KiB
Markdown
100 lines
3.6 KiB
Markdown
# Running a pill with Ares
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We can run a pill with Ares by performing a one-line modification to Vere in order
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to use Ares as a serf. This is accurate as of August 2023 - details may have
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changed since then.
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We first cover how to run `rust/ares/test_data/baby.pill`, then
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`hoon/scaffolding/azimuth-pill.hoon`, and finally some information on how to
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make your own pill.
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## Modify Vere
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Download the Vere repo and open `/pkg/vere/lord.c`. Search for `u3_lord_init()`.
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In this function definition, you will find several lines that look something
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like
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```
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arg_c[0] = god_u->bin_c; // executable
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arg_c[1] = "serf"; // protocol
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arg_c[2] = god_u->pax_c; // path to checkpoint directory
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arg_c[3] = key_c; // disk key
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arg_c[4] = wag_c; // runtime config
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...
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```
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Change the right hand side of the first line to the path of the Ares executable
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as a string literal (probably something like `rust/ares/target/debug/ares`):
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```
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arg_c[0] = "/path/to/ares";
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```
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Next we need to compile the new version of Vere that uses Ares as a serf. See
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[INSTALL.md](https://github.com/urbit/vere/blob/develop/INSTALL.md) in the Vere
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repo on how to do this. Now `cd` to the directory you'd like this version of
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Vere to reside in and make a symlink to the `urbit` executable you just
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created like so:
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```
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ln -s path/to/vere/repo/bazel-bin/pkg/vere/urbit ares-urbit
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```
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## Run `baby.pill`
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`baby.pill` is an extremely minimal Arvo-shaped core and Hoon standard library
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equipped with `%sham` jets needed to run it. ~wicdev-wisryt [streamed a
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video](https://youtu.be/fOVhCx1a-9A) of its development. You can find the Hoon
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for `baby.pill` in the Ares repo at `/hoon/scaffolding/baby.hoon`, and the
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library is `hoon/scaffolding/cradle.hoon`.
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The jammed pill is already in the Ares repo at `rust/ares/test_data/baby.pill`.
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To run it with our new version of Vere, we make a fakezod with `baby.pill` as
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the pill:
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```
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./ares-urbit -F zod -B /path/to/ares/rust/ares/test_data/baby.pill
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```
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This will boot a fakezod. If it writes `effect` to the terminal with every
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keystroke, you have succeeded!
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## Run `azimuth-pill.pill`
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Next we will show how to build a pill that processes an Azimuth snapshot, called
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`azimuth-pill.pill`.
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Boot a fakezod using the ordinary Urbit executable (not the one you created
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above) and run `|mount %`.
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Next, copy the contents of the `hoon/scaffolding/` folder from the Ares repo to
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`path/to/fakezod/base/lib` and run `|commit %base`, then
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```
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.azimuth-pill/pill -build-file %/lib/azimuth-pill/hoon
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```
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This will make a file `azimuth-pill.pill` in `path/to/fakezod/.urb/put`.
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Now we can run this pill with the version of Vere we built above:
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```
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./ares-urbit -F dev -B /path/to/fakezod/.urb/put/azimuth-pill.pill
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```
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If you succeeded, you should see the standard boot header followed by `ran a
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thousand logs` every few moments. If you're running an optimized build (e.g.
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`opt-level = 3`) of Ares this should finish in a few minutes or less. If you're
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running an unoptimized build (e.g. `opt-level = 0`) this could take much longer.
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## Making your own pill
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At time of writing, most jets have not yet been ported to Ares and so you cannot
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boot a typical solid pill. However, following the example of `baby.pill` and the
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development video linked above, and making use of the simplified standard libary
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`cradle.hoon`, you can still get Ares to run some interesting non-trivial Hoon.
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After making your own pill, you can write it to disk with `.my-pill/pill
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-build-file /path/to/my/pill` from a fakezod, and then run it just like you did
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with `baby.pill` and `azimuth-pill.pill` above.
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