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---
title: Go+
description: >-
A simple proof-of-concept script for doing go dependency management.
tags: tech
---
Compared to other languages go has some strange behavior regarding its project
root settings. If you import a library called `somelib`, go will look for a
`src/somelib` folder in all of the folders in the `$GOPATH` environment
variable. This works nicely for globally installed packages, but it makes
encapsulating a project with a specific version, or modified version, rather
tedious. Whenever you go to work on this project you'll have to add its path to
your `$GOPATH`, or add the path permanently, which could break other projects
which may use a different version of `somelib`.
My solution is in the form of a simple script I'm calling go+. go+ will search
in currrent directory and all of its parents for a file called `GOPROJROOT`. If
it finds that file in a directory, it prepends that directory's absolute path to
your `$GOPATH` and stops the search. Regardless of whether or not `GOPROJROOT`
was found go+ will passthrough all arguments to the actual go call. The
modification to `$GOPATH` will only last the duration of the call.
As an example, consider the following:
```
/tmp
/hello
GOPROJROOT
/src
/somelib/somelib.go
/hello.go
```
If `hello.go` depends on `somelib`, as long as you run go+ from `/tmp/hello` or
one of its children your project will still compile
Here is the source code for go+:
```bash
#!/bin/sh
SEARCHING_FOR=GOPROJROOT
ORIG_DIR=$(pwd)
STOPSEARCH=0
SEARCH_DIR=$ORIG_DIR
while [ $STOPSEARCH = 0 ]; do
RES=$( find $SEARCH_DIR -maxdepth 1 -type f -name $SEARCHING_FOR | \
grep -P "$SEARCHING_FOR$" | \
head -n1 )
if [ "$RES" = "" ]; then
if [ "$SEARCH_DIR" = "/" ]; then
STOPSEARCH=1
fi
cd ..
SEARCH_DIR=$(pwd)
else
export GOPATH=$SEARCH_DIR:$GOPATH
STOPSEARCH=1
fi
done
cd "$ORIG_DIR"
exec go $@
```
## UPDATE: Goat
I'm leaving this post for posterity, but go+ has some serious flaws in it. For
one, it doesn't allow for specifying the version of a dependency you want to
use. To this end, I wrote [goat][0] which does all the things go+ does, plus
real dependency management, PLUS it is built in a way that if you've been
following go's best-practices for code organization you shouldn't have to change
any of your existing code AT ALL. It's cool, check it out.
[0]: http://github.com/mediocregopher/goat
|
