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Maven Clean Up

mcup /m'kʌp/ (maven clean up) is a command line tool to keep your local maven repository small 📦 and tidy 🧹.

Maven is a great tool to build software for Java and other languages running on the JVM. At its core Maven is a dependency manager which downloads and stores dependencies in a local repository. Over time, this repository grows and takes up more and more space on the hard disk. It often contains obsolete versions or dependencies that are no longer needed.

mcup helps you to clean up your local repository. It uses filters to select artifacts based on the Maven coordinates groupId, artifactId and version. It knows three modes:

1. analyze and report the size of the artifacts selected by the filters
2. remove all artifacts selected by the filters and keep the rest
3. keep all artifacts selected by the filters and remove the rest

Installation

Support for various package managers is wip.

Precompiled binaries are available for Windows, macOS and Linux.

Shell Completion

The release binaries are packaged with a man page and shell completion files for bash, fish, zsh, elvish and Powershell. To install them:

• for bash, move completions/mcup.bash to $XDG_CONFIG_HOME/bash_completion or /etc/bash_completion.d/.
• for fish, move completions/mcup.fish to ~/.config/fish/completions/.
• for zsh, move completions/_mcup to one of your $fpath directories.
• for elvish, install completions/mcup.elv with epm
• for PowerShell, add completions/_mcup.ps1 to your PowerShell profile.

Cargo

If you're a Rust programmer, mcup can also be installed using cargo:

$ cargo install mcup

Usage

mcup [FLAGS] [OPTIONS] <SUBCOMMAND>

Flags

• -r, --releases Selects released artifacts only

• -s, --snapshots Selects snapshot artifacts only

• -h, --help Prints help information

• -V, --version Prints version information

Options

• -g, --groups <GROUPS> Selects artifacts based on the group ID.

  Subgroups are included by default.

  Group	Selection
  org	All groups starting with 'org' (including 'org')
  org.wildfly	All groups starting with 'org.wildfly' (includes 'org.wildfly)
  org.wildfly.core	All groups starting with 'org.wildfly.core' (includes 'org.wildfly.core')

• -a, --artifacts <ARTIFACTS> Selects artifacts based on the artifact ID.

  Supports globbing like in maven-*-plugin (see https://docs.rs/glob/0.3.0/glob/ for more details).

  Artifact	Selection
  wildfly-core	Artifact 'wildfly-core' only
  *wildfly*	All artifacts containing 'wildfly'

• -v, --versions <VERSIONS> Selects artifacts based on version (ranges).

  Use <n>.. to select the n most recent versions, ..<n> to select the n oldest versions and <version> to select one specific version only.

  Version	Selection
  1..	The latest version
  5..	The 5 most recent versions
  ..1	The oldest version
  ..4	The 4 oldest versions
  1.2.3	Version 1.2.3

• -l, --local-repository <LOCAL_REPOSITORY> Sets the location of the local maven repository.

  mcup respects the configuration of the local repository according to https://maven.apache.org/guides/mini/guide-configuring-maven.html#configuring-your-local-repository.

  The location of the local repository is computed in this order:

  1. The value of the option --local-repository
  2. The value of <localRepository/> in ~/.m2/settings.xml
  3. Fall back to ~/.m2/repository/

Subcommands

Disk Usage (du)

Use this subcommand to analyze the disk usage of the artifacts selected by the filters. The subcommand accepts the same filters as the keep and rm subcommands, but does not remove any artifacts. Instead, it selects the artifacts matched by the filters and calculates the size of the groups, artifacts and versions.

The subcommand accepts the following options:

• -o, --output <OUTPUT> Defines whether (g)roups, (a)rtifacts and (v)ersions are included in the usage summary. Defaults to ga.

See the DU page for more information and sample outputs.

Keep / Remove (keep, rm)

Use one of these subcommands to remove artifacts selected by the filters:

• keep Keeps the artifacts matched by the filters and removes the rest
• rm Removes the artifacts matched by the filters and keeps the rest

The subcommands accept the following flags:

• -d, --dry-run Does not remove artifacts

• --list Prints the full path to the artifacts that will be removed.

  Use this flag together with --dry-run to review or post-process artifacts that will be removed:

  mcup --versions '3..' keep --dry-run --list > artifacts.txt
  

Filter Combinations

For subcommands keep and rm at least one of --releases, --snapshots, --groups, --artifacts or--versions is required, where --releases and --snapshots are mutually exclusive.

Subcommand du has the same semantics as rm, but doesn't require a filter.

If --groups is specified together with any other filter, only artifacts below the matched (sub)groups are subject to the subcommands (du, keep or rm). Artifacts outside the matched (sub)groups won't be touched.

The following table explains the different filter combinations and describes which artifacts are analyzed, kept or removed.

Examples

Get a quick overview which groups take the most space

mcup du -og

Show the usage of all artifacts ending with '-build'. Include groups, artifacts and versions in the usage summary.

mcup --artifacts '*-build' du -ogav

Keep the three most recent versions

mcup --versions '3..' keep

Remove the three oldest versions

mcup --versions '..3' rm

Keep the latest releases (doesn't touch snapshots)

mcup --releases --version '1..' keep

Remove all snapshots

mcup --snapshots rm

Remove all artifacts starting with group ID 'edu'

mcup --groups edu rm

Keep the latest maven plugins. Don't remove anything outside group 'org.apache.maven.plugins'

mcup --groups 'org.apache.maven.plugins' --versions '1..' keep

Remove all artifacts (across all groups) starting with 'junit'

mcup --artifacts 'junit*' rm