Deprecated functionality

Some of the functionality that was available in previous EasyBuild versions is deprecated, and should no longer be used.

This functionality will be removed in a future version of EasyBuild (see Removed functionality for more information about functionality that has been removed already).

This page:

Overview of deprecated functionality in EasyBuild version 4.2.1

The different section below document the functionality that is deprecated in EasyBuild version 4.2.1, for which support will be removed in EasyBuild version 5.0.

For EasyBuild users:

For authors of easyconfig files:

For developers of easyblocks:

(nothing yet)

For EasyBuild framework developers:

(nothing yet)

Support for using Lmod 6.x

  • deprecated since: EasyBuild v4.1.0 (Nov‘19)
  • removed in: EasyBuild v5.0
  • alternative(s): use Lmod 7.x or more recent

Support for using Lmod 6.x as modules tool with EasyBuild has been deprecated, and will be removed in a future version of EasyBuild.

Support for running EasyBuild on top of Python 2.6

  • deprecated since: EasyBuild v4.1.0 (Nov‘19)
  • removed in: EasyBuild v5.0
  • alternative(s): use Python 2.7 or 3.5+

Support for running EasyBuild on top of Python 2.6 has been deprecated, and will be removed in a future version of EasyBuild.

You should upgrade to a newer version of Python (see also Compatibility with Python 2 and Python 3).

dummy toolchain

  • deprecated since: EasyBuild v4.0.0 (Sept‘19)
  • removed in: EasyBuild v5.0
  • alternative(s): use system toolchain instead

The dummy toolchain is has been deprecated, and is replaced with the system toolchain.

For more information, see System toolchain.

Deprecation policy

With every EasyBuild release, we try very hard to maintain backward compatibility. That is, EasyBuild version X.Y should still build software packages that could be built with EasyBuild version X.(Y-1), without requiring modifications to the used easyconfig file or easyblock.

However, every now and then a breaking change needs to be made to EasyBuild, because of design decisions or to resolve mistakes that were made in the past. These changes involve deprecating the behaviour or functionality we want to get rid of, together with supporting a better alternative.

Deprecating functionaliy:

  • using a log.deprecated("msg", 'X.Y') statement in EasyBuild version X.(Y-n) a certain block of code is tagged as deprecated, indicating that the corresponding functionality will no longer be supported in EasyBuild version X.Y; for example, to deprecate the use of the makeopts easyconfig parameter with EasyBuild v2.0:

    if self.cfg['makeopts']:
        self.log.deprecated("Easyconfig parameter 'makeopts' is deprecated, use 'buildopts' instead", '2.0')
    
  • until EasyBuild version X.Y, the deprecation log message will manifest itself as a warning, highlighting the use of deprecated functionality; for example:

    == 2014-12-16 16:29:07,906 main.easyconfig.easyconfig WARNING Deprecated functionality, will no longer work in v2.0:
    Easyconfig parameter 'makeopts' is deprecated, use 'buildopts' instead;
    see http://easybuild.readthedocs.org/en/latest/Deprecated-functionality.html for more information
    

Removing support for deprecated behavior:

  • starting with EasyBuild version X.Y, the deprecation log message will result in an error, indicating that the deprecated behavior is no longer supported; for example:

    ERROR: EasyBuild encountered an exception (at easybuild/framework/easyconfig/easyconfig.py:937 in process_easyconfig):
    Failed to process easyconfig /home/example/gzip-1.5-goolf-1.4.10.eb:
    DEPRECATED (since v2.0) functionality used: Easyconfig parameter 'makeopts' is deprecated, use 'buildopts' instead;
    see http://easybuild.readthedocs.org/en/latest/Deprecated-functionality.html for more informatio
    
  • the code supporting the deprecated functionality is removed in EasyBuild version X.(Y+1) (i.e., the first non-bugfix-only release after version X.Y), see also Removed functionality

  • until EasyBuild version X.(Y+1), the code supporting the deprecated functionality will still be available; using the --deprecated command line option (or, equivalently, the $EASYBUILD_DEPRECATED environment variable), the deprecated functionality can be reactivated by specifying a lower version; for example, to avoid running into an error with EasyBuild v2.0 for functionality that was deprecated for EasyBuild v2.0:

    eb gzip-1.5-goolf-1.4.10.eb --deprecated=1.0
    

How to check for use of deprecated functionality

Since EasyBuild v1.16.0, the --deprecated command line option can be used to check whether deprecated behavior is still being triggered in your EasyBuild setup.

For example, using --deprecated=5.0 with EasyBuild v4.x will transform any deprecation warning for functionality that will no longer be supported in EasyBuild v5.0 into an error message. For example:

$ eb test.eb --deprecated=5.0
== temporary log file in case of crash /tmp/easybuild-WWalWX/easybuild-aoL9Nd.log
ERROR: Failed to process easyconfig /home/example/test.eb:
DEPRECATED (since v5.0) functionality used: Use of 'dummy' toolchain is deprecated, use 'system' toolchain instead;
see http://easybuild.readthedocs.org/en/latest/Deprecated-functionality.html for more information
be used; see http://easybuild.readthedocs.org/en/latest/Deprecated-functionality.html for more information

Tip

Define deprecated to the next major EasyBuild version in one of your EasyBuild configuration files (see Configuration file(s)) or by defining $EASYBUILD_DEPRECATED=5.0, to ensure you are made aware of deprecated behavior as early as possible.

You can (temporarily) still rely on the deprecated functionality by specifying a lower version via --deprecated to overrule that setting, until the functionality is actually disabled.