Rust

Rust is a multi-paradigm, general-purpose programming language that emphasizes performance, type safety, and concurrency. It enforces memory safety—ensuring that all references point to valid memory—without requiring the use of a garbage collector or reference counting present in other memory-safe languages. To simultaneously enforce memory safety and prevent concurrent data races, its "borrow checker" tracks the object lifetime of all references in a program during compilation. Rust is popularized for systems programming but also has high-level features including some functional programming constructs.

wikipedia.org/wiki/Rust_(programming_language)

How to use this Makejail

Basic usage

Create a Makejail in your Rust app project.

INCLUDE options/network.makejail
INCLUDE gh+AppJail-makejails/rust

WORKDIR /app
COPY app/

RUN rustc hello.rs

STAGE cmd

WORKDIR /app
RUN ./hello

Where options/network.makejail are the options that suit your environment, for example:

ARG network
ARG interface=rustapp

OPTION virtualnet=${network}:${interface} default
OPTION nat

Open a shell and run appjail makejail:

appjail makejail -j rustapp -- --network development

To run the application we can use appjail run:

# appjail run rustapp
Hello, world!

Using Makejail builders

If we get the size of the previous jail

# appjail stop rustapp
...
# appjail cmd local rustapp du -sh
789M    .

we have a very large jail to run a simple binary. For compiled programming languages we could use Makejail builders to reduce the size of the jail.

Makejail:

OPTION start
OPTION overwrite

EXEC --name rustapp-builder --file build.makejail --arg network=development --arg interface=rstappb

WORKDIR /app
COPY --jail rustapp-builder /app/hello
DESTROY --force rustapp-builder

STAGE cmd

WORKDIR /app
RUN ./hello

build.makejail:

INCLUDE options/network.makejail
INCLUDE gh+AppJail-makejails/rust

WORKDIR /app
COPY app/

RUN rustc hello.rs

For simplicity, Makejail does not use more options than necessary, but you can use as many as you want without affecting build.makejail.

Open a shell and run appjail makejail:

appjail makejail -j rustapp

Now our jail with the application we want to run has a very reduced size.

# appjail stop rustapp
...
# appjail cmd local rustapp du -sh
 13M    .

Much of the size overhead if for jail, but for big applications this is not harmful.

Arguments

• rust_tag (default: 13.4): see #tags.
• rust_ajspec (default: gh+AppJail-makejails/rust): Entry point where the appjail-ajspec(5) file is located.

Tags

Tag	Arch	Version	Type
13.4	amd64	13.4-RELEASE	thin
14.2	amd64	14.2-RELEASE	thin