deps.clj

About

A faithful port of the Clojure CLI bash script to Clojure. Used as native CLI, deps resolver in babashka, and getting started REPL in Calva.

Clojure provides the clojure command line tool for:

• Running an interactive REPL (Read-Eval-Print Loop)
• Running Clojure programs
• Evaluating Clojure expressions

The clojure CLI is written in bash. This is a port of that tool written in Clojure itself.

Features

• Run as executable compiled with GraalVM Or run directly from source with babashka or the JVM
• Similar startup to bash (with native or babashka)
• Easy installation on all three major platforms including Windows
• Works in cmd.exe on Windows

Quickstart

Linux and macOS:

$ curl -sL https://raw.githubusercontent.com/borkdude/deps.clj/master/install > install_clojure
$ chmod +x ./install_clojure
$ ./install_clojure # you may need sudo, depending on your system
$ deps
Clojure 1.10.1
user=>

Windows:

C:\Temp> PowerShell -Command "irm https://raw.githubusercontent.com/borkdude/deps.clj/master/install.ps1" > install_clojure.ps1
C:\Temp> PowerShell -f install_clojure.ps1
C:\> deps.exe
Clojure 1.10.1
user=>

To install deps / deps.exe as clojure / clojure.exe on your system, add the --as-clj flag:

$ ./install_clojure --as-clj

If your Windows system does not run PowerShell, you can simply download a Windows binary from Github releases and place it on your path.

As of 1.11.1.1165, the scripts passes the values of the CLJ_JVM_OPTS or JAVA_OPTIONS to java when downloading dependencies or executing all other commands respectively (useful for setting up network connectivity behind firewalls).

Why

Originally this project was created as a proof of concept to see if the clojure bash script could be ported to Clojure and be used as a babashka script.

Nowadays it is used as the code behind the babashka.deps namespace and the clojure subcommand in babashka, to resolve and download dependencies for babashka itself, or when running a Clojure process with babashka.

This project offers an arguably easier way to get going with deps.edn based projects in CI. Just download an installer script, execute it with bash or Powershell and you're set. Installer scripts are provided for linux, macOS and Windows.

Windows users might find the deps.exe executable of value if they have trouble getting their system up and running. It works with cmd.exe unlike the current Powershell based approach.

Projects using deps.clj

Babashka

Available under the clojure subcommand. It is also available as a programmatic API under babashka.deps.

Calva

Used to provide a getting started REPL.

Status

Deps.clj tries to follow the official Clojure CLI as faithfully as possible and as such, this project can be considered a stable drop-in replacement. Experimental extra options may still be changed or removed in the future.

Installation

There are three ways of running:

• As a compiled binary called deps which is tailored to your OS.
• From source, as a script file called deps.clj using the bb or clojure runtime.
• As a JVM library or uberjar (see Github releases).

Binary

The binary version of deps.clj, called deps (without the .clj extension), only requires a working installation of java.

Manual download

Binaries for linux, macOS and Windows can be obtained on the Github releases page.

Linux and macOS

$ curl -sL https://raw.githubusercontent.com/borkdude/deps.clj/master/install > install_clojure
$ chmod +x ./install_clojure
$ ./install_clojure # you may need sudo, depending on your system
$ deps
Clojure 1.10.1
user=>

Windows

On Windows you might want to install deps.clj using scoop.

To install deps.clj as a replacement for the clj command, install clj-deps:

scoop bucket add scoop-clojure https://github.com/littleli/scoop-clojure
scoop install clj-deps

Alternatively you can install deps.exe using by executing the following line:

C:\Temp> PowerShell -Command "irm https://raw.githubusercontent.com/borkdude/deps.clj/master/install.ps1" > install_clojure.ps1
C:\Temp> PowerShell -f install_clojure.ps1
C:\> deps.exe
Clojure 1.10.1
user=>

It's automatically added to your path. In Powershell you can use it right away. In cmd.exe you'll have to restart the session for it to become available on the path.

When you get a message about a missing MSVCR100.dll, also install the Microsoft Visual C++ 2010 Redistributable Package (x64) which is also available in the extras Scoop bucket.

clj-msi

If you're interested in installing deps.clj as clj.exe and clojure.exe via an MSI installer, take a look at clj-msi!

Script

The script, deps.clj, requires a working installation of java and additionally bb or clojure.

It can simply be downloaded from this repo:

$ curl -sL https://raw.githubusercontent.com/borkdude/deps.clj/master/deps.clj -o /tmp/deps.clj
$ chmod +x /tmp/deps.clj
$ bb /tmp/deps.clj
Clojure 1.10.1
user=>

On Windows you can use the deps.bat script:

C:\Temp> curl -sL https://raw.githubusercontent.com/borkdude/deps.clj/master/deps.bat -o c:\Temp\deps.bat
C:\Temp> deps
C:\Temp>
Clojure 1.10.1
user=>

Environment variables

DEPS_CLJ_TOOLS_DIR

This project will look in $HOME/.deps.clj/<clojure-version>/ClojureTools for clojure-tools-<clojure-version>.jar, exec.jar and example-deps.edn. If it cannot it find those files there, it will try to download them from this location invoking java using the value of the CLJ_JVM_OPTS environment variable as options. You can override the location of these jars with the DEPS_CLJ_TOOLS_DIR environment variable. If the download fails for some reason, you can try to download the zip yourself at the location suggested by the failure message.

If you have an already installed version of clojure using e.g. brew, you can set DEPS_CLJ_TOOLS_DIR to that directory:

DEPS_CLJ_TOOLS_VERSION

This project assumes a specific version of the tools jar. However, it can be desirable to up- or downgrade the targetted tools jar in case of bug fixes or bugs in newer versions. Be aware that the code of this project is written with a specific version of the tools jar in mind, so use this at your own risk. Given that there isn't a lot of churn in the bash code that this project replaces, the risk should be relatively low.

Extra features

The deps.clj script adds the following features compared to the clojure tool:

 -Sdeps-file    Use this file instead of deps.edn
 -Scommand      A custom command that will be invoked. Substitutions: {{classpath}}, {{main-opts}}.

It also is able to pick up proxy information from environment variables.

-Scommand

One of the use cases for deps.clj is invoking a different command than java.

Given this deps.edn:

{:aliases
 {:test
  {:extra-paths ["test"]
   :extra-deps {borkdude/spartan.test {:mvn/version "0.0.4"}}
   :main-opts ["-m" "spartan.test" "-n" "borkdude.deps-test"]}}}

you can invoke bb like this:

$ deps.clj -A:test -Scommand "bb -cp {{classpath}} {{main-opts}}"
Ran 3 tests containing 3 assertions.
0 failures, 0 errors.

If you use -Scommand often, an alias can be helpful:

$ alias bbk='rlwrap deps.clj -Scommand "bb -cp {{classpath}} {{main-opts}}"'
$ bbk -A:test
Ran 3 tests containing 3 assertions.
0 failures, 0 errors.

The bbk alias is similar to the clj alias in that it adds rlwrap.

Additional args are passed along to the command:

$ bbk -e '(+ 1 2 3)'
6

Of course you can create another alias without rlwrap for CI, similar to the clojure command:

$ alias babashka='deps.clj -Scommand "bb -cp {{classpath}} {{main-opts}}"'

This approach can also be used with planck or lumo:

$ alias lm='deps.clj -Scommand "lumo -c {{classpath}} {{main-opts}}"'
$ lm -Sdeps '{:deps {medley {:mvn/version "1.2.0"}}}' -K \
  -e "(require '[medley.core :refer [index-by]]) (index-by :id [{:id 1} {:id 2}])"
{1 {:id 1}, 2 {:id 2}}

-Sdeps-file

The -Sdeps-file option may be used to load a different project file than deps.edn.

Proxy environment variables

deps.clj supports setting a proxy server via the "standard" environment variables (the lowercase versions are tried first):

• http_proxy or HTTP_PROXY for http traffic
• https_proxy or HTTPs_PROXY for https traffic

This will set the JVM properties -Dhttp[s].proxyHost and -Dhttp[s].proxyPort.

The format of the proxy string supported is http[s]://[username:password@]host:port. Any username and password info is ignored as not supported by the underlying JVM properties.

API

Since version 1.11.1.1273-3, deps.clj exposes an API so it can be embedded in applications, rather than just using it from the command line directly.

See API.md docs.

E.g to parse CLI options:

(require '[borkdude.deps :as deps])
(deps/parse-cli-opts ["-M:foo:bar" "-m" "foo.bar"])
;;=> {:mode :main, :main-aliases ":foo:bar", :args ("-m" "foo.bar")}

Re-binding the *aux-process-fn*, used for calculating the classpath, pom etc and *clojure-process-fn*, used for creating the actual Clojure process, gives you more control during the "shelling out" parts of deps.clj.

$ clj -Sdeps '{:deps {babashka/process {:mvn/version "0.5.19"}}}'

(require '[babashka.process :as p] '[borkdude.deps :as deps])

(defn my-aux-process [{:keys [cmd out]}]
  (binding [*out* *err*]
    (apply println "Calling aux process with cmd:" cmd))
  (p/shell {:cmd cmd :out out :extra-env {"GITLIBS" "/tmp/gitlibs"}}))

(defn my-clojure-process [{:keys [cmd out]}]
  (binding [*out* *err*]
    (apply println "Calling Clojure with command:" cmd))
  (p/shell {:cmd cmd :out *out* :extra-env {"FOO" "BAR"}}))

(binding [deps/*aux-process-fn* my-aux-process
          deps/*clojure-process-fn* my-clojure-process]
  (with-out-str (deps/-main "-Sforce" "-M" "-e" (pr-str '(System/getenv "FOO")))))

;;=>
Calling aux process with cmd: /usr/bin/java -XX:-OmitStackTraceInFastThrow -classpath ...
Calling Clojure with command: /usr/bin/java -XX:-OmitStackTraceInFastThrow -Dclojure.basis=... clojure.main -e (System/getenv "FOO")
"\"BAR\"\n"

Note that you should handle the exit codes yourself when implementing your own -process-fn. If you don't do that, then *exit-fn* will be called, which defaults to exiting the process if the :exit code was non-zero. To prevent this, you can re-bind *exit-fn* to throwing an exception instead:

Without re-binding *exit-fn*:

user=> (require '[borkdude.deps :as deps])
nil
user=> (deps/-main "-M" "-e" "(/ 1 0)")
Execution error (ArithmeticException) at user/eval1 (REPL:1).
Divide by zero

Full report at:
/var/folders/j9/xmjlcym958b1fr0npsp9msvh0000gn/T/clojure-8365878068735118865.edn

user=> (binding [deps/*exit-fn* (fn [{:keys [exit message]}] (println "Exit code:" exit))] (deps/-main "-M" "-e" "(/ 1 0)"))
Execution error (ArithmeticException) at user/eval1 (REPL:1).
Divide by zero

Full report at:
/var/folders/j9/xmjlcym958b1fr0npsp9msvh0000gn/T/clojure-2500586512812528128.edn
Exit code: 1
{:out nil, :exit 1}
user=> ;; we're still in the REPL

Developing deps.clj

For running locally, you can invoke deps.clj with clojure (totally meta right?). E.g. for creating a classpath with deps.clj, you can run:

$ clojure -M -m borkdude.deps -Spath

or with lein:

$ lein run -m borkdude.deps -Spath

To run jvm tests:

$ bb jvm-test

To run with babashka after making changes to src/borkdude/deps.clj, you should run:

$ bb gen-script

and then:

$ ./deps.clj -Spath
# or
$ bb deps.clj -Spath

To run as an executable, you'll first have to compile it. First, download a GraalVM distro. The compile script assumes that you will have set GRAALVM_HOME to the location of your GraalVM installation. Currently this project uses java-11-20.1.0.

$ export GRAALVM_HOME=/Users/borkdude/Downloads/graalvm-ce-java11-20.1.0/Contents/Home

The script also assumes that you have lein installed.

Run the compile script with:

$ bb compile

If everything worked out, there will be a deps binary in the root of the project.

To run executable tests:

$ bb exe-test

License

Copyright © 2019-2020 Michiel Borkent

Distributed under the EPL License. See LICENSE.

This project is based on code from clojure/brew-install which is licensed under the same EPL License.