forked from ungleich-public/cdist
143 lines
3.6 KiB
Bash
143 lines
3.6 KiB
Bash
#!/bin/sh -e
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#
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# 2021 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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# Determine current debconf selections' state.
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# Prints one of:
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# present: all selections are already set as they should.
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# different: one or more of the selections have a different value.
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# absent: one or more of the selections are not (currently) defined.
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#
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test -x /usr/bin/perl || {
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# cannot find perl (no perl ~ no debconf)
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echo 'absent'
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exit 0
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}
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linesfile="${__object:?}/parameter/line"
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test -s "${linesfile}" || {
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if test -s "${__object:?}/parameter/file"
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then
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echo absent
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else
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echo present
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fi
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exit 0
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}
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# assert __type_explorer is set (because it is used by the Perl script)
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: "${__type_explorer:?}"
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/usr/bin/perl -- - "${linesfile}" <<'EOF'
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use strict;
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use warnings "all";
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use Fcntl qw(:DEFAULT :flock);
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use Debconf::Db;
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use Debconf::Question;
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# Extract @known... arrays from debconf-set-selections
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# These values are required to distinguish flags and values in the given lines.
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# DC: I couldn't think of a more ugly solution to the problem…
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my @knownflags;
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my @knowntypes;
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my $debconf_set_selections = '/usr/bin/debconf-set-selections';
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if (-e $debconf_set_selections) {
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my $sed_known = 's/^my \(@known\(flags\|types\) = qw([a-z ]*);\).*$/\1/p';
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eval `sed -n '$sed_known' '$debconf_set_selections'`;
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}
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sub mungeline ($) {
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my $line = shift;
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chomp $line;
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$line =~ s/\r$//;
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return $line;
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}
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sub fatal { printf STDERR @_; exit 1; }
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my $state = 'present';
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sub state {
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my $new = shift;
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if ($state eq 'present'
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or ($state eq 'different' and $new eq 'absent')) {
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$state = $new;
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}
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}
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# Load Debconf DB but manually lock on the state explorer script,
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# because Debconf aborts immediately if executed concurrently.
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# This is not really an ideal solution because the Debconf DB could be locked by
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# another process (e.g. apt-get), but no way to achieve this could be found.
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# If you know how to, please provide a patch.
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my $lockfile = "%ENV{'__type_explorer'}/state";
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if (open my $lock_fh, '+<', $lockfile) {
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flock $lock_fh, LOCK_EX or die "Cannot lock $lockfile";
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}
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{
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Debconf::Db->load(readonly => 'true');
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}
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while (<>) {
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# Read and process lines (taken from debconf-set-selections)
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$_ = mungeline($_);
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while (/\\$/ && ! eof) {
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s/\\$//;
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$_ .= mungeline(<>);
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}
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next if /^\s*$/ || /^\s*\#/;
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my ($owner, $label, $type, $content) = /^\s*(\S+)\s+(\S+)\s+(\S+)(?:\s(.*))?/
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or fatal "invalid line: %s\n", $_;
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$content = '' unless defined $content;
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# Compare is and should state
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my $q = Debconf::Question->get($label);
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unless (defined $q) {
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# probably a preseed
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state 'absent';
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next;
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}
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if (grep { $_ eq $q->type } @knownflags) {
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# This line wants to set a flag, presumably.
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if ($q->flag($q->type) ne $content) {
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state 'different';
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}
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} else {
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# Otherwise, it's probably a value…
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if ($q->value ne $content) {
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state 'different';
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}
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unless (grep { $_ eq $owner } (split /, /, $q->owners)) {
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state 'different';
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}
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}
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}
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printf "%s\n", $state;
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EOF
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