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mediocregopher's lil web corner
- A simple proof-of-concept script for doing go dependency management.
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 $GOPATH will only last the duration of the call.
As an example, consider the following:
/tmp
/hello
GOPROJROOT
/src
/somelib/somelib.go
/hello.go
If hello.go depends on somelib, as long as you run go+ from /tmp/hello or
one of its children your project will still compile
Here is the source code for go+:
#!/bin/sh
SEARCHING_FOR=GOPROJROOT
ORIG_DIR=$(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 $@
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 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.
Published 2013-07-11
This site can also be accessed via the gemini protocol: gemini://mediocregopher.com/