104 lines
3.1 KiB
Bash
104 lines
3.1 KiB
Bash
#!/bin/sh -e
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#
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# 2020 Dennis Camera (dennis.camera at ssrq-sds-fds.ch)
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#
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# This file is part of cdist.
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#
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# cdist is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# cdist is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with cdist. If not, see <http://www.gnu.org/licenses/>.
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#
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# This explorer determines the "prefix" of the --type section matching --match
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# if set, or __object_id otherwise.
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RS=$(printf '\036')
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NL=$(printf '\n '); NL=${NL% }
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squote_values() {
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sed -e '/=".*"$/{s/="/='\''/;s/"$/'\''/}' \
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-e "/='.*'$/"'!{s/=/='\''/;s/$/'\''/}'
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}
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count_lines() (
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IFS=${NL?}
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# shellcheck disable=SC2048,SC2086
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set -f -- $*; echo $#
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)
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echo "${__object_id:?}" | grep -q -e '^[^.]\{1,\}\.[^.]\{1,\}$' || {
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echo 'Section identifiers are a package and section name separated by a "." (period).' >&2
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exit 1
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}
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test -s "${__object:?}/parameter/match" || {
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# If no --match is given, we take the __object_id as the section identifier.
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echo "${__object_id:?}"
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exit 0
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}
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test -s "${__object:?}/parameter/type" || {
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echo 'Parameters --match and --type must be used together.' >&2
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exit 1
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}
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sect_type_param=$(cat "${__object:?}/parameter/type")
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expr "${sect_type_param}" : '[^.]\{1,\}\.[^.]\{1,\}$' >/dev/null 2>&1 || {
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echo 'Section types are a package name and section type separated by a "." (period).' >&2
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exit 1
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}
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package_filter=${sect_type_param%%.*}
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section_filter=${sect_type_param#*.}
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# Find by --match
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# NOTE: Apart from section types all values are printed in single quotes by uci show.
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match=$(head -n 1 "${__object:?}/parameter/match" | squote_values)
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if uci -s -N get "${__object_id:?}" >/dev/null 2>&1
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then
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# Named section exists: ensure if --match applies to it
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# if the "matched" option does not exist (e.g. empty section) we use the
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# section unconditionally.
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if match_value_is=$(uci -s -N get "${__object_id:?}.${match%%=*}" 2>/dev/null)
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then
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match_value_should=$(expr "${match}" : ".*='\\(.*\\)'$")
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test "${match_value_is}" = "${match_value_should}" || {
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printf 'Named section "%s" does not match --match "%s"\n' \
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"${__object_id:?}" "${match}" >&2
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exit 1
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}
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fi
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echo "${__object_id:?}"
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exit 0
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fi
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# No correctly named section exists already: find one to which --match applies
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regex="^${package_filter}\\.@${section_filter}\\[[0-9]\\{1,\\}\\]\\.${match%%=*}="
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matched_sections=$(
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uci -s -N -d "${RS}" show "${package_filter}" 2>/dev/null \
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| grep -e "${regex}" \
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| while read -r _line
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do
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if test "${_line#*=}" = "${match#*=}"
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then
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echo "${_line}"
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fi
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done \
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| sed -e 's/\.[^.]*=.*$//')
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test "$(count_lines "${matched_sections}")" -le 1 || {
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printf 'Found multiple matching sections:\n%s\n' "${matched_sections}" >&2
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exit 1
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}
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echo "${matched_sections}"
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