Pull latest version of package from git

Question

I am using Haskell Stack, and the source code for the package I am building is on git. My stack.yaml looks like this:

packages:
- location:
    git: git@github.com:mhwombat/blah-blah-blah.git
    commit: master
. . .

Everything builds fine. However, suppose the source code is updated in the repository. Stack doesn't fetch the latest version; it continues to use the version it already has. My solution so far is to delete .stack-work and do another stack build , but of course it has to rebuild everything. When you're using lens, that takes a loooong time.

Is there a way to force Stack to fetch the latest version from git?

Already tried stack update and stack clean , but they don't solve this problem.

Answer 1

There's one way, but it is tedious instead of master as the commit, place the SHA1 of the latest commit. You can get the latest commit by running:

git rev-parse origin/master

The output should look like this: de7059a7a7c81c9c8997cad6dce7cdbd5b6c09d9

Then in your stack.yaml you would place this:

packages:
- location:
    git: git@github.com:mhwombat/blah-blah-blah.git
    commit: de7059a7a7c81c9c8997cad6dce7cdbd5b6c09d9
. . .

And you would have " forced " stack to fetch the latest commit when you run stack build no need to delete .stack-work anymore. It's not as simple as a single command but it worked for me and was not too annoying, as a bonus for me it helped me freeze a dependency. This is scriptable since it only uses git, though it wasn't tiresome enough that I made a script.