77 lines
1.3 KiB
Bash
77 lines
1.3 KiB
Bash
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#!/bin/bash --norc
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set -e
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shopt -s nullglob
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nodefault() {
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# We define a function instead of a variable, as variables could
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# be predefined in the environment (in theory)
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eval "gluon_feature_nodefault_$1() {
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:
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}"
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}
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packages() {
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:
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}
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for f in package/features packages/*/features; do
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. "$f"
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done
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# Shell variables can't contain minus signs, so we escape them
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# using underscores (and also escape underscores to avoid mapping
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# multiple inputs to the same output)
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sanitize() {
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local v="$1"
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v="${v//_/_1}"
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v="${v//-/_2}"
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echo -n "$v"
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}
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vars=
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for feature in $1; do
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if [ "$(type -t gluon_feature_nodefault_${feature})" != 'function' ]; then
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echo "gluon-${feature}"
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fi
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vars="$vars $(sanitize "$feature")=1"
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done
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nodefault() {
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:
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}
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packages() {
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local cond="$(sanitize "$1")"
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shift
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# We only allow variable names, parentheses and the operators: & | !
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if [ "$(expr match "$cond" '.*[^A-Za-z0-9_()&|! ].*')" -gt 0 ]; then
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exit 1
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fi
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# Let will return false when the result of the passed expression is 0,
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# so we always add 1. This way false is only returned for syntax errors.
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local ret="$(env -i $vars bash --norc -ec "let _result_='1+($cond)'; echo -n \"\$_result_\"" 2>/dev/null)"
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case "$ret" in
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2)
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for pkg in "$@"; do
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echo "$pkg"
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done
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;;
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1)
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;;
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*)
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exit 1
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esac
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}
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for f in package/features packages/*/features; do
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. "$f"
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done
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