# We create a cluster, execute some basic SQL commands, drop it again, and
# check that we did not leave anything behind.

use strict; 

use File::Temp qw(tempdir);
use POSIX qw/dup2/;
use Time::HiRes qw/usleep/;

use lib 't';
use TestLib;
use PgCommon;

use Test::More tests => 149 * @MAJORS;

$ENV{_SYSTEMCTL_SKIP_REDIRECT} = 1; # FIXME: testsuite is hanging otherwise

sub check_major {
    my $v = $_[0];
    note "Running tests for $v";

    # create cluster
    my $xlogdir = tempdir("/tmp/$v.xlog.XXXXXX", CLEANUP => 1);
    rmdir $xlogdir; # recreated by initdb
    if ($v > 8.2) {
        my $start_command = $v >= 14 ? "14 *main *5432 *online" : # initdb --no-instructions in 14+
            ($v >= 11 and not $PgCommon::rpm) ? "pg_ctlcluster" : "pg_ctl"; # CLUSTER_START_COMMAND supported in initdb 11+
        like_program_out 'root', "pg_createcluster $v main --start -- -X $xlogdir", 0, qr/$start_command/,
            "pg_createcluster $v main";
    } else { # 8.2 does not have -X yet
        like_program_out 'root', "pg_createcluster $v main --start", 0, qr/pg_ctl/,
            "pg_createcluster $v main";
        system "mv /var/lib/postgresql/$v/main/pg_xlog $xlogdir";
        system "ln -s $xlogdir /var/lib/postgresql/$v/main/pg_xlog";
    }

    # check that a /var/run/postgresql/ pid file is created
    my @contents = ('.s.PGSQL.5432', '.s.PGSQL.5432.lock', "$v-main.pid", "$v-main.pg_stat_tmp");
    pop @contents if ($v < 8.4); # remove pg_stat_tmp
    unless ($PgCommon::rpm and $v < 9.4) {
        ok_dir '/var/run/postgresql/', [@contents],
            'Socket and pid file are in /var/run/postgresql/';
    } else {
        ok_dir '/var/run/postgresql/', [grep {/main/} @contents], 'Pid File is in /var/run/postgresql/';
    }

    # check that the xlog/wal symlink was created
    my $first_xlog = $v >= 9.0 ? "000000010000000000000001" : "000000010000000000000000";
    ok_dir $xlogdir, [$first_xlog, "archive_status"],
        "xlog/wal directory $xlogdir was created";

    # verify that exactly one postgres master is running
    my @pm_pids = pidof ('postgres');
    is $#pm_pids, 0, 'Exactly one postgres master process running';

    # check environment
    my %safe_env = qw/LC_ALL 1 LC_CTYPE 1 LANG 1 PWD 1 PGLOCALEDIR 1 PGSYSCONFDIR 1 PG_GRANDPARENT_PID 1 PG_OOM_ADJUST_FILE 1 PG_OOM_ADJUST_VALUE 1 SHLVL 1 PGDATA 1 _ 1/;
    my %env = pid_env 'postgres', $pm_pids[0];
    foreach (keys %env) {
        fail "postgres has unsafe environment variable $_" unless exists $safe_env{$_};
    }

    # activate external_pid_file
    PgCommon::set_conf_value $v, 'main', 'postgresql.conf', 'external_pid_file', '';

    # add variable to environment file, restart, check if it's there
    open E, ">>/etc/postgresql/$v/main/environment" or 
        die 'could not open environment file for appending';
    print E "PGEXTRAVAR1 = 1 # short one\nPGEXTRAVAR2='foo bar '\n\n# comment";
    close E;
    is_program_out 0, "pg_ctlcluster $v main restart", 0, '',
        'cluster restarts with new environment file';

    @pm_pids = pidof ('postgres');
    is $#pm_pids, 0, 'Exactly one postgres master process running';
    %env = pid_env 'postgres', $pm_pids[0];
    is $env{'PGEXTRAVAR1'}, '1', 'correct value of PGEXTRAVAR1 in environment';
    is $env{'PGEXTRAVAR2'}, 'foo bar ', 'correct value of PGEXTRAVAR2 in environment';

    # Now there should not be an external PID file any more, since we set it
    # explicitly
    unless ($PgCommon::rpm and $v < 9.4) {
        ok_dir '/var/run/postgresql', [grep {! /pid/} @contents],
            'Socket and stats dir, but not PID file in /var/run/postgresql/';
    } else {
        ok_dir '/var/run/postgresql', ["$v-main.pg_stat_tmp"], 'Only stats dir in /var/run/postgresql/';
    }

    # verify that the correct client version is selected
    like_program_out 'postgres', 'createdb --version', 0, qr/^createdb \(PostgreSQL\) $v/,
        'pg_wrapper selects version number of cluster';

    # we always want to use the latest version of "psql", though.
    like_program_out 'postgres', 'psql --version', 0, qr/^psql \(PostgreSQL\) $ALL_MAJORS[-1]/,
        'pg_wrapper selects version number of cluster';

    my $default_log = "/var/log/postgresql/postgresql-$v-main.log";

    # verify that the cluster is displayed
    my $ls = `pg_lsclusters -h`;
    $ls =~ s/\s+/ /g;
    $ls =~ s/\s*$//;
    is $ls, "$v main 5432 online postgres /var/lib/postgresql/$v/main $default_log",
	'pg_lscluster reports online cluster on port 5432';

    # verify that the log file is actually used
    ok !-z $default_log, 'log file is actually used';

    # verify configuration file permissions
    my $postgres_uid = (getpwnam 'postgres')[2];
    my @st = stat "/etc/postgresql";
    is $st[4], $postgres_uid, '/etc/postgresql is owned by user "postgres"';
    my @st = stat "/etc/postgresql/$v";
    is $st[4], $postgres_uid, 'version configuration directory file is owned by user "postgres"';
    my @st = stat "/etc/postgresql/$v/main";
    is $st[4], $postgres_uid, 'configuration directory file is owned by user "postgres"';

    # verify data file permissions
    my @st = stat "/var/lib/postgresql/$v";
    is $st[4], $postgres_uid, 'version data directory file is owned by user "postgres"';
    my @st = stat "/var/lib/postgresql/$v/main";
    is $st[4], $postgres_uid, 'data directory file is owned by user "postgres"';

    # verify log file permissions
    my @logstat = stat $default_log;
    is $logstat[2], 0100640, 'log file has 0640 permissions';
    is $logstat[4], $postgres_uid, 'log file is owned by user "postgres"';
    is $logstat[5], (getgrnam 'adm')[2], 'log file is owned by group "adm"';

    # check default log file configuration; when not specifying -l with
    # pg_createcluster, we should not have a 'log' symlink
    ok !-e "/etc/postgresql/$v/main/log", 'no log symlink by default';
    ok !-z $default_log, "$default_log is the default log if log symlink is missing";
    like_program_out 'postgres', 'pg_lsclusters -h', 0, qr/^$v\s+main.*$default_log\n$/;

    # verify that log symlink works
    is ((exec_as 'root', "pg_ctlcluster $v main stop"), 0, 'stopping cluster');
    truncate "$default_log", 0; # empty log file
    my $p = (PgCommon::cluster_data_directory $v, 'main') . '/mylog';
    symlink $p, "/etc/postgresql/$v/main/log";
    is ((exec_as 'root', "pg_ctlcluster $v main start"), 0, 
        'restarting cluster with nondefault log symlink');
    ok !-z $p, "log target is used as log file";
    ok -z $default_log, "default log is not used";
    like_program_out 'postgres', 'pg_lsclusters -h', 0, qr/^$v\s+main.*$p\n$/;
    is ((exec_as 'root', "pg_ctlcluster $v main stop"), 0, 'stopping cluster');
    truncate "$default_log", 0; # empty log file

    # verify that explicitly configured log file trumps log symlink
    PgCommon::set_conf_value ($v, 'main', 'postgresql.conf', 
        ($v >= '8.3' ? 'logging_collector' : 'redirect_stderr'), 'on');
    PgCommon::set_conf_value $v, 'main', 'postgresql.conf', 'log_filename', "$v#main.log";
    is ((exec_as 'root', "pg_ctlcluster $v main start"), 0, 
        'restarting cluster with explicitly configured log file');
    ok -z $default_log, "default log is not used";
    ok !-z $p, "log symlink target is used for startup message";
    my $pg_log = $v >= 10 ? 'log' : 'pg_log'; # log directory in PGDATA changed in PG 10
    my @l = glob ((PgCommon::cluster_data_directory $v, 'main') .  "/$pg_log/$v#main.log*");
    is $#l, 0, 'exactly one log file';
    ok (-e $l[0] && ! -z $l[0], 'custom log is actually used');
    SKIP: { skip "no logging_collector in $v", 2 if ($v < 8.3);
    like_program_out 'postgres', 'pg_lsclusters -h', 0, qr/^$v\s+main.*$v#main.log\n$/;
    }

    # clean up
    PgCommon::disable_conf_value ($v, 'main', 'postgresql.conf', 
        ($v >= '8.3' ? 'logging_collector' : 'redirect_stderr'), '');
    PgCommon::disable_conf_value $v, 'main', 'postgresql.conf', 'log_filename', '';
    unlink "/etc/postgresql/$v/main/log";

    # check that log creation does not escalate privileges
    program_ok 'root', "pg_ctlcluster $v main stop", 0, 'stopping cluster';
    unlink $default_log;
    symlink "/etc/postgres-hack", $default_log;
    program_ok 'root', "pg_ctlcluster $v main start", 1, 'starting cluster with rouge /var/log/postgresql symlink fails';
    ok !-f "/etc/postgres-hack", "/etc/postgres-hack was not created";
    unlink $default_log;
    program_ok 'root', "pg_ctlcluster $v main start", 0, 'restarting cluster';

    # verify that processes do not have an associated terminal
    unlike_program_out 0, 'ps -o tty -U postgres h', 0, qr/tty|pts/,
        'postgres processes do not have an associated terminal';

    # verify that SSL is enabled (which should work for user postgres in a
    # default installation)
    my $ssl = config_bool (PgCommon::get_conf_value $v, 'main', 'postgresql.conf', 'ssl');
    my $ssl_linked = `ldd $PgCommon::binroot$v/bin/postgres | grep libssl`;
    my ($os, $osversion) = os_release();
    if ($PgCommon::rpm) {
        isnt $ssl_linked, '', 'Server is linked with SSL support';
        is $ssl, undef, 'SSL is disabled in postgresql.conf';
    } elsif ($v <= 9.1 and (($os eq 'debian' and ($osversion eq 'unstable' or $osversion > 9)) or # stretch had 1.0 and 1.1
                            ($os eq 'ubuntu' and $osversion > 18.04))) { # bionic had 1.0 and 1.1
        is $ssl_linked, '', 'Server is linked without SSL support (old version with only OpenSSL 1.0 support)';
        is $ssl, undef, 'SSL is disabled in postgresql.conf';
    } else {
        isnt $ssl_linked, '', 'Server is linked with SSL support';
        is $ssl, 1, 'SSL is enabled in postgresql.conf';
    }

    # Create user nobody, a database 'nobodydb' for him, check the database list
    my $outref;
    is ((exec_as 'nobody', 'psql -l 2>/dev/null', $outref), 2, 'psql -l fails for nobody');
    is ((exec_as 'postgres', 'createuser nobody -D -R -S'), 0, 'createuser nobody');
    is ((exec_as 'postgres', 'createdb -O nobody nobodydb'), 0, 'createdb nobodydb');
    is ((exec_as 'nobody', 'psql -ltA|grep "|" | cut -f1-3 -d"|"', $outref), 0, 'psql -ltA succeeds for nobody');
    is ($$outref, 'nobodydb|nobody|UTF8
postgres|postgres|UTF8
template0|postgres|UTF8
template1|postgres|UTF8
', 'psql -ltA output');

    # Then fill nobodydb with some data.
    is ((exec_as 'nobody', 'psql nobodydb -c "create table phone (name varchar(255) PRIMARY KEY, tel int NOT NULL)" 2>/dev/null'), 
	0, 'SQL command: create table');
    is ((exec_as 'nobody', 'psql nobodydb -c "insert into phone values (\'Bob\', 1)"'), 0, 'SQL command: insert into table values');
    is ((exec_as 'nobody', 'psql nobodydb -c "insert into phone values (\'Alice\', 2)"'), 0, 'SQL command: insert into table values');
    is ((exec_as 'nobody', 'psql nobodydb -c "insert into phone values (\'Bob\', 3)"'), 1, 'primary key violation');

    # Check table contents
    is_program_out 'nobody', 'psql -tAc "select * from phone order by name" nobodydb', 0,
        'Alice|2
Bob|1
', 'SQL command output: select -tA';
    is_program_out 'nobody', 'psql -txc "select * from phone where name = \'Alice\'" nobodydb', 0,
        'name | Alice
tel  | 2

', 'SQL command output: select -tx';
    is_program_out 'nobody', 'psql -tAxc "select * from phone where name = \'Alice\'" nobodydb', 0,
        'name|Alice
tel|2
', 'SQL command output: select -tAx';

    sub create_extension ($$) {
        my ($v, $extension) = @_;
        return "psql -qc 'CREATE EXTENSION $extension' nobodydb" if ($v >= 9.1);
        return "createlang --cluster $v/main $extension nobodydb";
    }

    # Check PL/Perl untrusted
    my $fn_cmd = 'CREATE FUNCTION read_file() RETURNS text AS \'open F, \\"/etc/passwd\\"; \\$buf = <F>; close F; return \\$buf;\' LANGUAGE plperl';
    is ((exec_as 'nobody', create_extension($v, 'plperlu')), 1, 'CREATE EXTENSION plperlu fails for user nobody');
    is_program_out 'postgres', create_extension($v, 'plperlu'), 0, '', 'CREATE EXTENSION plperlu succeeds for user postgres';
    is ((exec_as 'nobody', "psql nobodydb -qc \"${fn_cmd}u;\""), 1, 'creating PL/PerlU function as user nobody fails');
    is ((exec_as 'postgres', "psql nobodydb -qc \"${fn_cmd};\""), 1, 'creating unsafe PL/Perl function as user postgres fails');
    is_program_out 'postgres', "psql nobodydb -qc \"${fn_cmd}u;\"", 0, '', 'creating PL/PerlU function as user postgres succeeds';
    like_program_out 'nobody', 'psql nobodydb -Atc "select read_file()"',
	0, qr/^root:/, 'calling PL/PerlU function';

    # Check PL/Perl trusted
    my $pluser = ($v >= '8.3') ? 'nobody' : 'postgres'; # pg_pltemplate allows non-superusers to install trusted languages in 8.3+
    is_program_out $pluser, create_extension($v, 'plperl'), 0, '', "CREATE EXTENSION plperl succeeds for user $pluser";
    is ((exec_as 'nobody', "psql nobodydb -qc \"${fn_cmd};\""), 1, 'creating unsafe PL/Perl function as user nobody fails');
    is_program_out 'nobody', 'psql nobodydb -qc "CREATE FUNCTION remove_vowels(text) RETURNS text AS \'\\$_[0] =~ s/[aeiou]/_/ig; return \\$_[0];\' LANGUAGE plperl;"',
	0, '', 'creating PL/Perl function as user nobody succeeds';
    is_program_out 'nobody', 'psql nobodydb -Atc "select remove_vowels(\'foobArish\')"',
	0, "f__b_r_sh\n", 'calling PL/Perl function';

    # Check PL/Python (untrusted)
    SKIP: {
    skip "No python2 support", 6 unless ($v <= 11 and $PgCommon::have_python2);
    is_program_out 'postgres', create_extension($v, 'plpythonu'), 0, '', 'CREATE EXTENSION plpythonu succeeds for user postgres';
    is_program_out 'postgres', 'psql nobodydb -qc "CREATE FUNCTION capitalize(text) RETURNS text AS \'import sys; return args[0].capitalize() + sys.version[0]\' LANGUAGE plpythonu;"',
	0, '', 'creating PL/Python function as user postgres succeeds';
    is_program_out 'nobody', 'psql nobodydb -Atc "select capitalize(\'foo\')"',
	0, "Foo2\n", 'calling PL/Python function';
    }

    # Check PL/Python3 (untrusted)
    if ($v >= '9.1') {
	is_program_out 'postgres', create_extension($v, 'plpython3u'), 0, '', 'CREATE EXTENSION plpython3u succeeds for user postgres';
	is_program_out 'postgres', 'psql nobodydb -qc "CREATE FUNCTION capitalize3(text) RETURNS text AS \'import sys; return args[0].capitalize() + sys.version[0]\' LANGUAGE plpython3u;"',
	    0, '', 'creating PL/Python3 function as user postgres succeeds';
	is_program_out 'nobody', 'psql nobodydb -Atc "select capitalize3(\'foo\')"',
	    0, "Foo3\n", 'calling PL/Python function';
    } else {
	pass "Skipping PL/Python3 test for version $v...";
	pass '...';
	pass '...';
	pass '...';
	pass '...';
	pass '...';
    }

    # Check PL/Tcl (trusted/untrusted)
    is_program_out 'postgres', create_extension($v, 'pltcl'), 0, '', 'CREATE EXTENSION pltcl succeeds for user postgres';
    is_program_out 'postgres', create_extension($v, 'pltclu'), 0, '', 'CREATE EXTENSION pltclu succeeds for user postgres';
    is_program_out 'nobody', 'psql nobodydb -qc "CREATE FUNCTION tcl_max(integer, integer) RETURNS integer AS \'if {\\$1 > \\$2} {return \\$1}; return \\$2\' LANGUAGE pltcl STRICT;"',
	0, '', 'creating PL/Tcl function as user nobody succeeds';
    is_program_out 'postgres', 'psql nobodydb -qc "CREATE FUNCTION tcl_max_u(integer, integer) RETURNS integer AS \'if {\\$1 > \\$2} {return \\$1}; return \\$2\' LANGUAGE pltclu STRICT;"',
	0, '', 'creating PL/TclU function as user postgres succeeds';
    is_program_out 'nobody', 'psql nobodydb -Atc "select tcl_max(3,4)"', 0,
        "4\n", 'calling PL/Tcl function';
    is_program_out 'nobody', 'psql nobodydb -Atc "select tcl_max_u(5,4)"', 0,
        "5\n", 'calling PL/TclU function';

    # fake rotated logs to check that they are cleaned up properly
    open L, ">$default_log.1" or die "could not open fake rotated log file";
    print L "old log .1\n";
    close L;
    open L, ">$default_log.2" or die "could not open fake rotated log file";
    print L "old log .2\n";
    close L;
    if (system "gzip -9 $default_log.2") {
        die "could not gzip fake rotated log";
    }

    # Check that old-style pgdata symbolic link still works (p-common 0.90+
    # does not create them any more, but they still need to work for existing
    # installations)
    is ((exec_as 'root', "pg_ctlcluster $v main stop"), 0, 'stopping cluster');
    my $datadir = PgCommon::get_conf_value $v, 'main', 'postgresql.conf', 'data_directory';
    symlink $datadir, "/etc/postgresql/$v/main/pgdata";

    # data_directory should trump the pgdata symlink
    PgCommon::set_conf_value $v, 'main', 'postgresql.conf', 'data_directory', '/nonexisting';
    like_program_out 0, "pg_ctlcluster $v main start", 1, 
        qr/\/nonexisting is not accessible/,
        'cluster fails to start with invalid data_directory and valid pgdata symlink';

    # if only pgdata symlink is present, it is authoritative
    PgCommon::disable_conf_value $v, 'main', 'postgresql.conf', 'data_directory', 'disabled for test';
    is_program_out 0, "pg_ctlcluster $v main start", 0, '',
        'cluster restarts with pgdata symlink';

    # check properties of backend processes
    pipe RH, WH;
    my $psql = fork;
    if (!$psql) {
	close WH;
	my @pw = getpwnam 'nobody';
	change_ugid $pw[2], $pw[3];
	open(STDIN, "<& RH");
	dup2(POSIX::open('/dev/null', POSIX::O_WRONLY), 1);
	exec 'psql', 'nobodydb' or die "could not exec psql process: $!";
    }
    close RH;
    select WH; $| = 1; # make unbuffered

    my $master_pid = `ps --user postgres hu | grep 'bin/postgres.*-D' | grep -v grep | awk '{print \$2}'`;
    chomp $master_pid;

    my $client_pid;
    while (!$client_pid) {
	usleep $delay;
	$client_pid = `ps --user postgres hu | grep 'postgres.*: nobody nobodydb' | grep -v grep | awk '{print \$2}'`;
	($client_pid) = ($client_pid =~ /(\d+)/); # untaint
    }

    # OOM score adjustment under Linux: postmaster gets bigger shields for >=
    # 9.0, but client backends stay at default; this might not work in
    # containers with restricted privileges, so skip the check there
    my $adj;
    my $detect_virt = system 'systemd-detect-virt --container --quiet'; # from systemd
    open F, "/proc/$master_pid/oom_score_adj";
    $adj = <F>;
    chomp $adj;
    close F;
    if ($v >= '9.0' and not $PgCommon::rpm) {
        SKIP: {
            skip 'skipping postmaster OOM killer adjustment in container', 1 if $detect_virt == 0;
            cmp_ok $adj, '<=', -500, 'postgres master has OOM killer protection';
        }
    } else {
        is $adj, 0, 'postgres master has no OOM adjustment';
    }

    open F, "/proc/$client_pid/oom_score_adj";
    $adj = <F>;
    chomp $adj;
    close F;
    is $adj, 0, 'postgres client backend has no OOM adjustment';

    # test process title update
    like_program_out 0, "ps h $client_pid", 0, qr/ idle\s*$/, 'process title is idle';
    print WH "BEGIN;\n";
    usleep $delay;
    like_program_out 0, "ps h $client_pid", 0, qr/idle in transaction/, 'process title is idle in transaction';
    print WH "SELECT pg_sleep(2); COMMIT;\n";
    usleep $delay;
    like_program_out 0, "ps h $client_pid", 0, qr/SELECT/, 'process title is SELECT';

    close WH;
    waitpid $psql, 0;

    # Drop database and user again.
    usleep $delay;
    is ((exec_as 'nobody', 'dropdb nobodydb', $outref, 0), 0, 'dropdb nobodydb', );
    is ((exec_as 'postgres', 'dropuser nobody', $outref, 0), 0, 'dropuser nobody');

    # log file gets re-created by pg_ctlcluster
    is ((exec_as 0, "pg_ctlcluster $v main stop"), 0, 'stopping cluster');
    unlink $default_log;
    is ((exec_as 0, "pg_ctlcluster $v main start"), 0, 'starting cluster as postgres works without a log file');
    ok (-e $default_log && ! -z $default_log, 'log file got recreated and used');

    # create tablespaces
    my $spc1 = tempdir("/tmp/$v.spc1.XXXXXX", CLEANUP => 1);
    my $spc2 = tempdir("/tmp/$v.spc2.XXXXXX", CLEANUP => 1);
    is (mkdir ("$spc2/PG_99_fakedirectory"), 1, 'creating a directory in spc2');
    chown $postgres_uid, 0, $spc1, $spc2, "$spc2/PG_99_fakedirectory";
    is_program_out 'postgres', "psql -qc \"CREATE TABLESPACE spc1 LOCATION '$spc1'\"", 0, '', 'creating tablespace spc1';
    is_program_out 'postgres', "psql -qc 'CREATE TABLE tbl1 (x int) TABLESPACE spc1'", 0, '', 'creating a table in spc1';
    SKIP: {
        skip "Non-empty tablespaces not supported before 9.0", 4 if ($v < 9.0);
        is_program_out 'postgres', "psql -qc \"CREATE TABLESPACE spc2 LOCATION '$spc2'\"", 0, '', 'creating tablespace spc2';
        is_program_out 'postgres', "psql -qc 'CREATE TABLE tbl2 (x int) TABLESPACE spc2'", 0, '', 'creating a table in spc2';
    }

    # check apt config
    is_program_out 0, "egrep -o 'postgresql.[0-9.*-]+' /etc/apt/apt.conf.d/01autoremove-postgresql", 0,
        "postgresql.*-$v\n", "Correct apt NeverAutoRemove config";

    # stop server, clean up, check for leftovers
    ok ((system "pg_dropcluster $v main --stop") == 0,
	'pg_dropcluster removes cluster');

    is (-e $xlogdir, undef, "xlog/wal directory $xlogdir was deleted");
    ok_dir $spc1, [], "tablespace spc1 was emptied";
    ok_dir $spc2, [qw(PG_99_fakedirectory)], "tablespace spc2 was emptied";

    is_program_out 0, "egrep -o 'postgresql.[0-9.*-]+' /etc/apt/apt.conf.d/01autoremove-postgresql", 1,
        "", "Correct apt NeverAutoRemove config";

    check_clean;
}

foreach (@MAJORS) { 
    check_major $_;
}

# vim: filetype=perl