stack-clean-old: Clean away old stack build artefacts

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A tool for cleaning away old .stack snapshots and .stack-work builds to recover diskspace.

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Versions 0.1, 0.2, 0.2, 0.2.1, 0.2.2, 0.3, 0.3.1, 0.4, 0.4.1, 0.4.2, 0.4.3, 0.4.4, 0.4.5, 0.4.6
Change log
Dependencies base (<5), directory (>=1.2.5), extra (>=1.4.3), filepath, simple-cmd (>=0.1.4), simple-cmd-args (>=0.1.2) [details]
License BSD-3-Clause
Copyright 2020 Jens Petersen <>
Author Jens Petersen <>
Maintainer Jens Petersen <>
Category Distribution
Home page
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Source repo head: git clone
Uploaded by JensPetersen at 2020-10-27T08:00:26Z


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For package maintainers and hackage trustees

Readme for stack-clean-old-0.2

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A small tool to clean away older Haskell stack snapshot builds and ghc versions, to recover diskspace.


stack-clean-old [project|snapshots|ghc] [size|list|remove-version|remove-earlier-minor] [GHCVER]

These commands act respectively on:

and the subcommands:

size: prints the total size of the above directory (size does not take a GHCVER argument).

list: shows the total size and number of snapshots per ghc version (the GHCVER argument is optional).

remove-version: removes all snapshots for the specified ghc version (the GHCVER argument is required).

remove-earlier-minor: removes the builds/installs for previous minor ghc versions. If GHCVER is given then only minor versions older than it are removed.

NB: If you remove all snapshot builds for a version of ghc, then you would have to rebuild again for any projects still using them, so removal should be used cautiously, but it can recover a lot of diskspace.

Example usage

To remove project builds for ghc-8.2.2:

$ stack-clean-old project list
154M  8.2.2  (5 dirs)
154M  8.4.4  (5 dirs)
163M  8.6.5  (5 dirs)
$ stack-clean-old project remove-version 8.2.2

Remove all stack ghc-8.4 snapshot builds before 8.4.4:

$ stack-clean-old snapshots list 8.4
421M  8.4.1  (7 dirs)
368M  8.4.2  (6 dirs)
489M  8.4.3  (8 dirs)
799M  8.4.4  (24 dirs)
$ stack-clean-old snapshots remove-earlier-minor 8.4.4
7 dirs removed for 8.4.1
6 dirs removed for 8.4.2
8 dirs removed for 8.4.3

Incidently I build my projects across as many major Stackage LTS versions as possible, and collectively this piles up to a lot of diskspace: so I wrote this tool to help manage that.

Purging older stack project builds

stack-clean-old project remove-older

This command removes older stack builds from .stack-work/install/. By default it keeps 5 newest builds per ghc version.

The preservation/deletion is calculated and done per ghc version.

NB: If you regularly build multiple branches/tags against the same LTS or ghc version then it is better safer to avoid using remove-older.


Run stack install or cabal install


BSD license


Warning disclaimer

Use at your own risk.

The author takes no responsibility for any loss or damaged caused by using this tool.

Bug reports, suggestions, and improvements are welcome.