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docs: Update readme #25

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45 changes: 33 additions & 12 deletions README.md
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# goaci
# proj2aci

`goaci` is a simple command-line tool to build go projects into ACIs which confirm to the [app container specification][appc-spec].
`proj2aci` is a command-line tool to build various projects into ACIs which conform to the [app container specification][appc-spec].

Currently `proj2aci` supports rather simple cases:

- Go projects buildable with `go get`
- Rather simpler CMake projects

`proj2aci` project is probably going to be superseded by [acbuild]
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This is basically telling people "don't use this" - is that really the message we want to send? Does it not provide any value?

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I see it as quite distinct from acbuild philosophically

project. Also, the UI of the `proj2aci` application and the API of the
`proj2aci` library are not stable.

[appc-spec]: https://github.com/appc/spec
[acbuild]: https://github.com/appc/acbuild

## Usage

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Retaining a little bit of info on how it works would be nice.

Use `goaci` as you would `go get`:
### `proj2aci go`

The simplest invocation of `proj2aci go` would be: `proj2aci go github.com/coreos/etcd`

For additional parameters, please call `proj2aci go --help`.

### `proj2aci cmake`

The simplest invocation of `proj2aci go` would be: `proj2aci cmake github.com/cmake-stuff/project`
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s/go/cmake/


$ goaci github.com/coreos/etcd
Wrote etcd.aci
$ actool -debug validate etcd.aci
etcd.aci: valid app container image
For additional parameters, please call `proj2aci cmake --help`.

`goaci` provides options for specifying assets, adding arguments for an application, selecting binary is going to be packaged in final ACI and so on. Use --help to read about them.
### a library

## How it works
`github.com/appc/proj2aci/proj2aci` provides a `Builder` type which
take `BuilderCustomizations` interface implementation. The `Builder`
is doing all the heavy lifting, while `BuilderCustomizations` provide
some specific bits for builder. The library provides
`BuilderCustomizations` for `go` and `cmake` projects. A developer can
provide another implementation of `BuilderCustomizations` for building
a different kind of a project.

`goaci` creates a temporary directory and uses it as a `GOPATH` (unless it is overridden with `--go-path` option); it then `go get`s the specified package and compiles it statically.
Then it generates an image manifest (using mostly default values) and leverages the [appc/spec](https://github.com/appc/spec) libraries to construct an ACI.
Besides the above, the library provides also some other useful
functions and types for assets preparing or getting vcs info.

## TODO

Lots, check out https://github.com/appc/goaci/issues
Lots, check out https://github.com/appc/proj2aci/issues