98 lines
2.5 KiB
Bash
Executable File
98 lines
2.5 KiB
Bash
Executable File
#!/bin/sh -e
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#
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# 2011 Nico Schottelius (nico-cdist at schottelius.org)
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# 2012 Giel van Schijndel (giel plus cdist at mortis dot eu)
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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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#
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# Retrieve the status of a package - parses opkg output
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#
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readonly __type_path=${__object%%${__object_id}*}
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test -d "${__type_path}" || { echo 'Cannot determine __type_path' >&2; exit 1; }
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readonly LOCKFILE="${__type_path:?}/.cdist_opkg.lock"
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if command -v flock >/dev/null 2>&1
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then
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# use flock (if available) on FD 9
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_lock() {
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exec 9<>"${LOCKFILE:?}"
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flock -x 9
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echo $$>&9
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}
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_unlock() {
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:>"${LOCKFILE:?}"
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flock -u 9
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exec 9<&-
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}
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else
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# fallback to mkdir if flock is missing
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_lock() {
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until mkdir "${LOCKFILE:?}.dir" 2>/dev/null
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do
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while test -d "${LOCKFILE}.dir"
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do
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# DEBUG:
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# printf 'Locked by PID: %u\n' "$(cat "${LOCKFILE}.dir/pid")"
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sleep 1
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done
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done
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echo $$ >"${LOCKFILE:?}.dir/pid"
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}
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_unlock() {
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test -d "${LOCKFILE}.dir" || return 0
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if test -s "${LOCKFILE}.dir/pid"
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then
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test "$(cat "${LOCKFILE}.dir/pid")" = $$ || return 1
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rm "${LOCKFILE:?}.dir/pid"
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fi
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rmdir "${LOCKFILE:?}.dir"
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}
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fi
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if test -f "${__object}/parameter/name"
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then
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pkg_name=$(cat "${__object}/parameter/name")
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else
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pkg_name=$__object_id
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fi
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# NOTE: We need to lock parallel execution of type explorers and code-remote
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# because opkg will try to acquire the OPKG lock (usually /var/lock/opkg.lock)
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# using lockf(2) for every operation.
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# It will not wait for the lock but terminate with an error.
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# This leads to incorrect 'absent notpresent' statuses when parallel execution
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# is enabled.
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trap _unlock EXIT
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_lock
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# Except opkg failing, if package is not known / installed
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if opkg status "${pkg_name}" 2>/dev/null \
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| grep -q -e '^Status: [^ ][^ ]* [^ ][^ ]* installed$'
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then
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echo 'present'
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elif opkg info "${pkg_name}" 2>/dev/null | grep -q .
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then
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echo 'absent notpresent'
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else
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echo 'absent'
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fi
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