diff options
Diffstat (limited to 'infra/dgit-repos-policy-debian')
| -rwxr-xr-x | infra/dgit-repos-policy-debian | 553 |
1 files changed, 553 insertions, 0 deletions
diff --git a/infra/dgit-repos-policy-debian b/infra/dgit-repos-policy-debian new file mode 100755 index 0000000..990abd2 --- /dev/null +++ b/infra/dgit-repos-policy-debian @@ -0,0 +1,553 @@ +#!/usr/bin/perl -w +# dgit repos policy hook script for Debian +# +# Copyright (C) 2015-2016 Ian Jackson +# +# This program is free software; you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation; either version 3 of the License, or +# (at your option) any later version. +# +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program. If not, see <http://www.gnu.org/licenses/>. + +use strict; + +use Debian::Dgit::Infra; # must precede Debian::Dgit; - can change @INC! +use Debian::Dgit qw(:DEFAULT :policyflags); +setup_sigwarn(); + +use POSIX; +use JSON; +use File::Temp qw(tempfile); +use DBI; +use IPC::Open2; +use Data::Dumper; + +use Debian::Dgit::Policy::Debian; + +initdebug('%'); +enabledebuglevel $ENV{'DGIT_DRS_DEBUG'}; + +END { $? = 127; } # deliberate exit uses _exit + +our $distro = shift @ARGV // die "need DISTRO"; +our $repos = shift @ARGV // die "need DGIT-REPOS-DIR"; +our $dgitlive = shift @ARGV // die "need DGIT-LIVE-DIR"; +our $distrodir = shift @ARGV // die "need DISTRO-DIR"; +our $action = shift @ARGV // die "need ACTION"; + +our $publicmode = 02775; +our $new_upload_propagation_slop = 3600*4 + 100;# fixme config; + +our $poldbh; +our $pkg; +our $pkgdir; +our ($pkg_exists,$pkg_secret); + +our $stderr; + +our ($version,$suite,$tagname); +our %deliberately; + +# We assume that it is not possible for NEW to have a version older +# than sid. + +# Whenever pushing, we check for +# source-package-local tainted history +# global tainted history +# can be overridden by --deliberately except for an admin prohib taint +# +# ALL of the following apply only if history is secret: +# +# if NEW has no version, or a version which is not in our history[1] +# (always) +# check all suites +# if any suite's version is in our history[1], publish our history +# otherwise discard our history, +# tainting --deliberately-include-questionable-history +# +# if NEW has a version which is in our history[1] +# (on push only) +# require explicit specification of one of +# --deliberately-include-questionable-history +# --deliberately-not-fast-forward +# (latter will taint old NEW version --d-i-q-h) +# (otherwise) +# leave it be +# +# [1] looking for the relevant git tag for the version number and not +# caring what that tag refers to. +# +# When we are doing a push to a fresh repo, any version will do: in +# this case, this is the first dgit upload of an existing package, +# and we trust that the uploader hasn't included in their git +# history any previous non-dgit uploads. +# +# A wrinkle: if we approved a push recently, we treat NEW as having +# a version which is in our history. This is because the package may +# still be being uploaded. (We record this using the timestamp of the +# package's git repo directory.) + +# We aim for the following invariants and properties: +# +# - .dsc of published dgit package will have corresponding publicly +# visible dgit-repo (soon) +# +# - when a new package is rejected we help maintainer avoid +# accidentally including bad objects in published dgit history +# +# - .dsc of NEW dgit package has corresponding dgit-repo but not +# publicly readable + +sub apiquery ($) { + my ($subpath) = @_; + local $/=undef; + my $dgit = "$dgitlive/dgit"; + $dgit = "dgit" if !stat_exists $dgit; + my $cmd = "$dgit -d$distro \$DGIT_TEST_OPTS"; + $cmd .= " -".("D" x $debuglevel) if $debuglevel; + $cmd .= " archive-api-query $subpath"; + printdebug "apiquery $cmd\n"; + $!=0; $?=0; my $json = `$cmd`; + defined $json && !$? or die "$subpath $! $?"; + my $r = decode_json $json; + my $d = new Data::Dumper([$r], [qw(r)]); + printdebug "apiquery $subpath | ", $d->Dump() if $debuglevel>=2; + return $r; +} + +sub vsn_in_our_history ($) { + my ($vsn) = @_; + + # Eventually, when we withdraw support for old-format (DEP-14 + # namespace) tags, we will need to change this to only look + # for debiantag_new. See the commit + # "Tag change: Update dgit-repos-policy-debian" + # (reverting which is a good start for that change). + + my @tagrefs = map { "refs/tags/".$_ } debiantags $vsn, $distro; + printdebug " checking history vsn=$vsn tagrefs=@tagrefs\n"; + open F, "-|", qw(git for-each-ref), @tagrefs; + $_ = <F>; + close F; + return 1 if defined && m/\S/; + die "$pkg tagrefs @tagrefs $? $!" if $?; + return 0; +} + +sub specific_suite_has_suitable_vsn ($$) { + my ($suite, $vsn_check) = @_; # tests $vsn_check->($version) + my $in_suite = apiquery "dsc_in_suite/$suite/$pkg"; + foreach my $entry (@$in_suite) { + my $vsn = $entry->{version}; + die "$pkg ?" unless defined $vsn; + printdebug " checking history found suite=$suite vsn=$vsn\n"; + return 1 if $vsn_check->($vsn); + } + return 0; +} + +sub new_has_vsn_in_our_history () { + return specific_suite_has_suitable_vsn('new', \&vsn_in_our_history); +} + +sub good_suite_has_suitable_vsn ($) { + my ($vsn_check) = @_; # as for specific_suite_has_specific_vsn + my $suites = apiquery "suites"; + foreach my $suitei (@$suites) { + my $suite = $suitei->{name}; + die unless defined $suite; + next if $suite =~ m/\bnew$/; + return 1 if specific_suite_has_suitable_vsn($suite, $vsn_check); + } + return 0; +} + +sub statpackage () { + $pkgdir = "$repos/$pkg.git"; + if (!stat_exists $pkgdir) { + printdebug "statpackage $pkg => ENOENT\n"; + $pkg_exists = 0; + } else { + $pkg_exists = 1; + $pkg_secret = !!(~(stat _)[2] & 05); + printdebug "statpackage $pkg => exists, secret=$pkg_secret.\n"; + } +} + +sub getpackage () { + die unless @ARGV >= 1; + $pkg = shift @ARGV; + die unless $pkg =~ m/^$package_re$/; + + statpackage(); +} + +sub add_taint ($$) { + my ($refobj, $reason) = @_; + + printdebug "TAINTING $refobj\n", + (map { "\%| $_" } split "\n", $reason), + "\n"; + + my $tf = new File::Temp or die $!; + print $tf "$refobj^0\n" or die $!; + flush $tf or die $!; + seek $tf,0,0 or die $!; + + my $gcfpid = open GCF, "-|"; + defined $gcfpid or die $!; + if (!$gcfpid) { + open STDIN, "<&", $tf or die $!; + exec 'git', 'cat-file', '--batch'; + die $!; + } + + close $tf or die $!; + $_ = <GCF>; + defined $_ or die; + m/^(\w+) (\w+) (\d+)\n/ or die "$_ ?"; + my $gitobjid = $1; + my $gitobjtype = $2; + my $bytes = $3; + + my $gitobjdata; + if ($gitobjtype eq 'commit' or $gitobjtype eq 'tag') { + $!=0; read GCF, $gitobjdata, $bytes == $bytes + or die "$gitobjid $bytes $!"; + } + close GCF; + + $poldbh->do("INSERT INTO taints". + " (package, gitobjid, gitobjtype, gitobjdata, time, comment)". + " VALUES (?,?,?,?,?,?)", {}, + $pkg, $gitobjid, $gitobjtype, $gitobjdata, time, $reason); + + my $taint_id = $poldbh->last_insert_id(undef,undef,"taints","taint_id"); + die unless defined $taint_id; + + $poldbh->do("INSERT INTO taintoverrides". + " (taint_id, deliberately)". + " VALUES (?, '--deliberately-include-questionable-history')", + {}, $taint_id); +} + +sub add_taint_by_tag ($$) { + my ($tagname,$refobjid) = @_; + add_taint($refobjid, + "tag $tagname referred to this object in git tree but all". + " previously pushed versions were found to have been". + " removed from NEW (ie, rejected) (or never arrived)"); +} + +sub check_package () { + return 0 unless $pkg_exists; + return 0 unless $pkg_secret; + + printdebug "check_package\n"; + + chdir $pkgdir or die "$pkgdir $!"; + + stat '.' or die "$pkgdir $!"; + my $mtime = ((stat _)[9]); + my $age = time - $mtime; + printdebug "check_package age=$age\n"; + + if (good_suite_has_suitable_vsn(\&vsn_in_our_history)) { + chmod $publicmode, "." or die $!; + $pkg_secret = 0; + eval { + my $mirror_hook = "$distrodir/mirror-hook"; + if (stat_exists $mirror_hook) { + my @mirror_cmd = + ($mirror_hook, $distrodir, "updated-hook", $pkg); + debugcmd " (mirror)",@mirror_cmd; + system @mirror_cmd and failedcmd @mirror_cmd; + } + }; + if (length $@) { + chomp $@; + print STDERR "policy hook: warning:". + " failed to mirror publication of \`$pkg':". + " $@\n"; + } + return 0; + } + + return 0 if $age < $new_upload_propagation_slop; + + return 0 if new_has_vsn_in_our_history(); + + printdebug "check_package secret, deleted, tainting\n"; + + git_for_each_ref('refs/tags', sub { + my ($objid,$objtype,$fullrefname,$tagname) = @_; + add_taint_by_tag($tagname,$objid); + }); + + return FRESHREPO; +} + +sub action_check_package () { + getpackage(); + return check_package(); +} + +sub getpushinfo () { + die unless @ARGV >= 4; + $version = shift @ARGV; + $suite = shift @ARGV; + $tagname = shift @ARGV; + my $delibs = shift @ARGV; + foreach my $delib (split /\,/, $delibs) { + $deliberately{$delib} = 1; + } +} + +sub deliberately ($) { return $deliberately{"--deliberately-$_[0]"}; } + +sub action_push () { + getpackage(); + getpushinfo(); + + check_package(); # might make package public, or might add taints + + return 0 unless $pkg_exists; + return 0 unless $pkg_secret; + + # we suppose that NEW has a version which is already in our + # history, as otherwise the repo would have been blown away + + if (deliberately('not-fast-forward')) { + add_taint(server_ref($suite), + "rewound suite $suite; --deliberately-not-fast-forward". + " specified in signed tag $tagname for upload of". + " version $version"); + return NOFFCHECK|FRESHREPO; + } + if (deliberately('include-questionable-history')) { + return 0; + } + die "\nPackage is in NEW and has not been accepted or rejected yet;". + " use a --deliberately option to specify whether you are". + " keeping or discarding the previously pushed history. ". + " Please RTFM dgit(1).\n\n"; +} + +sub action_push_confirm () { + getpackage(); + getpushinfo(); + die unless @ARGV >= 1; + my $freshrepo = shift @ARGV; + + my $initq = $poldbh->prepare(<<END); + SELECT taint_id, gitobjid FROM taints t + WHERE (package = ? OR package = '') +END + $initq->execute($pkg); + + my @objscatcmd = qw(git); + push @objscatcmd, qw(--git-dir), $freshrepo if length $freshrepo; + push @objscatcmd, qw(cat-file --batch); + debugcmd '|',@objscatcmd if $debuglevel>=2; + + my @taintids; + my $chkinput = tempfile(); + while (my $taint = $initq->fetchrow_hashref()) { + push @taintids, $taint->{taint_id}; + print $chkinput $taint->{gitobjid}, "\n" or die $!; + printdebug '|> ', $taint->{gitobjid}, "\n" if $debuglevel>=2; + } + flush $chkinput or die $!; + seek $chkinput,0,0 or die $!; + + my $checkpid = open CHKOUT, "-|" // die $!; + if (!$checkpid) { + open STDIN, "<&", $chkinput or die $!; + delete $ENV{GIT_ALTERNATE_OBJECT_DIRECTORIES}; + # ^ recent versions of git set this in the environment of + # receive hooks. This can cause us to see things which + # the user is trying to abolish. + exec @objscatcmd or die $!; + } + + my ($taintinfoq,$overridesanyq,$untaintq,$overridesq); + + my $overridesstmt = <<END; + SELECT deliberately FROM taintoverrides WHERE ( + 1=0 +END + my @overridesv = sort keys %deliberately; + $overridesstmt .= <<END foreach @overridesv; + OR deliberately = ? +END + $overridesstmt .= <<END; + ) AND taint_id = ? + ORDER BY deliberately ASC +END + + my $mustreject=0; + + while (my $taintid = shift @taintids) { + $!=0; $_ = <CHKOUT>; + die "($taintid @objscatcmd) $!" unless defined $_; + printdebug "|< ", $_ if $debuglevel>=2; + + next if m/^\w+ missing$/; + die "($taintid @objscatcmd) $_ ?" unless m/^(\w+) (\w+) (\d+)\s/; + my ($objid,$objtype,$nbytes) = ($1,$2,$3); + + my $drop; + (read CHKOUT, $drop, $nbytes) == $nbytes + or die "($taintid @objscatcmd) $!"; + + $!=0; $_ = <CHKOUT>; + die "($taintid @objscatcmd) $!" unless defined $_; + die "($taintid @objscatcmd) $_ ?" if m/\S/; + + $taintinfoq ||= $poldbh->prepare(<<END); + SELECT package, time, comment FROM taints WHERE taint_id = ? +END + $taintinfoq->execute($taintid); + + my $ti = $taintinfoq->fetchrow_hashref(); + die "($taintid)" unless $ti; + + my $timeshow = defined $ti->{time} + ? " at time ".strftime("%Y-%m-%d %H:%M:%S Z", gmtime $ti->{time}) + : ""; + my $pkgshow = length $ti->{package} + ? "package $ti->{package}" + : "any package"; + + $stderr .= <<END; + +History contains tainted $objtype $objid +Taint recorded$timeshow for $pkgshow +Reason: $ti->{comment} +END + + printdebug "SQL overrides: @overridesv $taintid /\n$overridesstmt\n"; + + $overridesq ||= $poldbh->prepare($overridesstmt); + $overridesq->execute(@overridesv, $taintid); + my ($ovwhy) = $overridesq->fetchrow_array(); + if (!defined $ovwhy) { + $overridesanyq ||= $poldbh->prepare(<<END); + SELECT 1 FROM taintoverrides WHERE taint_id = ? LIMIT 1 +END + $overridesanyq->execute($taintid); + my ($ovany) = $overridesanyq->fetchrow_array(); + $stderr .= $ovany ? <<END : <<END; +Could be forced using --deliberately. Consult documentation. +END +Uncorrectable error. If confused, consult administrator. +END + $mustreject = 1; + } else { + $stderr .= <<END; +Forcing due to --deliberately-$ovwhy +END + $untaintq ||= $poldbh->prepare(<<END); + DELETE FROM taints WHERE taint_id = ? +END + $untaintq->execute($taintid); + } + } + close CHKOUT; + + if ($mustreject) { + $stderr .= <<END; + +Rejecting push due to questionable history. +END + return 1; + } + + if (length $freshrepo) { + if (!good_suite_has_suitable_vsn(sub { 1; })) { + stat $freshrepo or die "$freshrepo $!"; + my $oldmode = ((stat _)[2]); + my $oldwrites = $oldmode & 0222; + # remove r and x bits which have corresponding w bits clear + my $newmode = $oldmode & + (~0555 | ($oldwrites << 1) | ($oldwrites >> 1)); + printdebug sprintf "chmod %#o (was %#o) %s\n", + $newmode, $oldmode, $freshrepo; + chmod $newmode, $freshrepo or die $!; + utime undef, undef, $freshrepo or die $!; + } + } + + return 0; +} + +sub action_check_list () { + opendir L, "$repos" or die "$repos $!"; + while (defined (my $dent = readdir L)) { + next unless $dent =~ m/^($package_re)\.git$/; + $pkg = $1; + statpackage(); + next unless $pkg_exists; + next unless $pkg_secret; + print "$pkg\n" or die $!; + } + closedir L or die $!; + close STDOUT or die $!; + return 0; +} + +$action =~ y/-/_/; +my $fn = ${*::}{"action_$action"}; +if (!$fn) { + printdebug "dgit-repos-policy-debian: unknown action $action\n"; + exit 0; +} + +my $sleepy=0; +my $rcode; + +my $db_busy_exception= 'Debian::Dgit::Policy::Debian::DB_BUSY'; + +my @orgargv = @ARGV; + +for (;;) { + @ARGV = @orgargv; + eval { + poldb_setup(poldb_path($repos), sub { + $poldbh->{HandleError} = sub { + return 0 unless $poldbh->err == 5; # SQLITE_BUSY, not in .pm :-( + die bless { }, $db_busy_exception; + }; + + eval ($ENV{'DGIT_RPD_TEST_DBLOOP_HOOK'}//''); + die $@ if length $@; + # used by tests/tests/debpolicy-dbretry + }); + + $stderr = ''; + + $rcode = $fn->(); + die unless defined $rcode; + + $poldbh->commit; + }; + last unless length $@; + die $@ unless ref $@ eq $db_busy_exception; + + die if $sleepy >= 20; + $sleepy++; + print STDERR "[policy database busy, retrying (${sleepy}s)]\n"; + + eval { $poldbh->rollback; }; +} + +print STDERR $stderr or die $!; +flush STDERR or die $!; +_exit $rcode; |