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asdf/docs/core-configuration.md

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.tool-versions

Whenever .tool-versions file is present in a directory, the tool versions it declares will be used in that directory and any subdirectories.

?> Global defaults can be set in the file $HOME/.tool-versions

This is what a .tool-versions file looks like:

ruby 2.5.3
nodejs 10.15.0

The versions can be in the following format:

  • 10.15.0 - an actual version. Plugins that support downloading binaries, will download binaries.
  • ref:v1.0.2-a or ref:39cb398vb39 - tag/commit/branch to download from github and compile
  • path:/src/elixir - a path to custom compiled version of a tool to use. For use by language developers and such.
  • system - this keyword causes asdf to passthrough to the version of the tool on the system that is not managed by asdf.

Multiple versions can be set by separating them with a space. For example, to use Python 3.7.2, fallback to Python 2.7.15 and finally to the system Python, the following line can be added to .tool-versions.

python 3.7.2 2.7.15 system

To install all the tools defined in a .tool-versions file run asdf install with no other arguments in the directory containing the .tool-versions file.

Edit the file directly or use asdf local (or asdf global) which updates it.

$HOME/.asdfrc

Add a .asdfrc file to your home directory and asdf will use the settings specified in the file. The file should be formatted like this:

legacy_version_file = yes

Settings

  • legacy_version_file - defaults to no. If set to yes it will cause plugins that support this feature to read the version files used by other version managers (e.g. .ruby-version in the case of Ruby's rbenv).
  • use_release_candidates - defaults to no. If set to yes it will cause the asdf update command to upgrade to the latest release candidate release instead of the latest semantic version.

Environment Variables

  • ASDF_CONFIG_FILE - Defaults to ~/.asdfrc as described above. Can be set to any location.
  • ASDF_DEFAULT_TOOL_VERSIONS_FILENAME - The name of the file storing the tool names and versions. Defaults to .tool-versions. Can be any valid file name.
  • ASDF_DATA_DIR - Defaults to ~/.asdf - Location where asdf install plugins, shims and installs. Can be set to any location before sourcing asdf.sh or asdf.fish mentioned in the section above.