Query Functions Reference

The following functions, which are provided by ebuild.sh, can be used to query variables and similar state.

Function Details
use flagname Returns a true value if and only if flagname is enabled. The condition is inverted if prefixed with an exclamation mark, !flagname. It is guaranteed that use produces no output.
useq flagname Deprecated synonym for use.
usev flagname As use, echoes flagname upon success.
use_enable flag str val Echoes either --enable-str=val or --disable-str depending upon useq flag. If str is not specified, uses flag instead. If val is not specified, omits the assignment part.
use_with flag str val As use_enable, but --with- or --without-.
has flag string Returns true if flag is included in the flag list string (example: if has ccache $FEATURES ; then). The condition is inverted if prefixed with an exclamation mark, !flag. It is guaranteed that has produces no output.
hasq flag string Deprecated synonym for has.
hasv flag string As has, echoes flag on success.
best_version pkg Echoes the 'best' version of pkg which is currently installed.
has_version pkg True if pkg (can include version specifiers) is installed.