Why isn't stack-compat from lts-7.3 installed in ~/.stack ?

[Kostiantyn Rybnikov]

We are trying to list all dependencies from lts which we use to store them in our base haskell image. We're currently on lts-7.3, and it has aeson-compat in it, yet we somehow get it installed not in ~/.stack ("snapshot-install-root"), but inside of the .stack-work local to the project:

➜  stack exec ghc-pkg list aeson-compat

/Users/kb/.stack/programs/x86_64-osx/ghc-8.0.1/lib/ghc-8.0.1/package.conf.d

    (no packages)

/Users/kb/.stack/snapshots/x86_64-osx/lts-7.3/8.0.1/pkgdb

    (no packages)

/Users/kb/workspace/proj/.stack-work/install/x86_64-osx/lts-7.3/8.0.1/pkgdb

    aeson-compat-0.3.6

Can somebody please explain why it's not in ~/.stack but is in .stack-work?

Thank you!

[Kostiantyn Rybnikov]

Actually, found this in the "Architecture" docs:

• Local: extra-deps, local packages, and snapshot packages which depend on them (more on that in shadowing)

Probably that package is a dep of our local pkg.

Sorry for disturbing! Went checking if it's true :)