4 # git protocol proxy to check dgit pushes etc.
6 # Copyright (C) 2014-2016 Ian Jackson
8 # This program is free software; you can redistribute it and/or modify
9 # it under the terms of the GNU General Public License as published by
10 # the Free Software Foundation; either version 3 of the License, or
11 # (at your option) any later version.
13 # This program is distributed in the hope that it will be useful,
14 # but WITHOUT ANY WARRANTY; without even the implied warranty of
15 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 # GNU General Public License for more details.
18 # You should have received a copy of the GNU General Public License
19 # along with this program. If not, see <http://www.gnu.org/licenses/>.
22 # dgit-repos-server DISTRO DISTRO-DIR AUTH-SPEC [<settings>] --ssh
23 # dgit-repos-server DISTRO DISTRO-DIR AUTH-SPEC [<settings>] --cron
25 # --repos=GIT-REPOS-DIR default DISTRO-DIR/repos/
26 # --suites=SUITES-FILE default DISTRO-DIR/suites
27 # --suites-master=SUITES-FILE default DISTRO-DIR/suites-master
28 # --policy-hook=POLICY-HOOK default DISTRO-DIR/policy-hook
29 # --mirror-hook=MIRROR-HOOK default DISTRO-DIR/mirror-hook
30 # --dgit-live=DGIT-LIVE-DIR default DISTRO-DIR/dgit-live
31 # (DISTRO-DIR is not used other than as default and to pass to policy
34 # .../dgit-repos-server --pre-receive-hook PACKAGE
36 # Invoked as the ssh restricted command
38 # Works like git-receive-pack
40 # SUITES-FILE is the name of a file which lists the permissible suites
41 # one per line (#-comments and blank lines ignored). For --suites-master
42 # it is a list of the suite(s) which should, when pushed to, update
43 # `master' on the server (if fast forward).
45 # AUTH-SPEC is a :-separated list of
46 # KEYRING.GPG,AUTH-SPEC
47 # where AUTH-SPEC is one of
50 # (With --cron AUTH-SPEC is not used and may be the empty string.)
54 use Debian::Dgit::Infra; # must precede Debian::Dgit; - can change @INC!
55 use Debian::Dgit qw(:DEFAULT :policyflags);
58 # DGIT-REPOS-DIR contains:
59 # git tree (or other object) lock (in acquisition order, outer first)
61 # _tmp/PACKAGE_prospective ! } SAME.lock, held during receive-pack
63 # _tmp/PACKAGE_incoming$$ ! } SAME.lock, held during receive-pack
64 # _tmp/PACKAGE_incoming$$_fresh ! }
66 # PACKAGE.git } PACKAGE.git.lock
67 # PACKAGE_garbage } (also covers executions of
68 # PACKAGE_garbage-old } policy hook script for PACKAGE)
69 # PACKAGE_garbage-tmp }
70 # policy* } (for policy hook script, covered by
71 # } lock only when invoked for a package)
73 # leaf locks, held during brief operaton only:
78 # _template } SAME.lock
80 # locks marked ! may be held during client data transfer
82 # What we do on push is this:
83 # - extract the destination repo name
84 # - make a hardlink clone of the destination repo
85 # - provide the destination with a stunt pre-receive hook
86 # - run actual git-receive-pack with that new destination
87 # as a result of this the stunt pre-receive hook runs; it does this:
88 # + understand what refs we are allegedly updating and
89 # check some correspondences:
90 # * we are updating only refs/tags/[archive/]DISTRO/* and refs/dgit/*
91 # * and only one of each
92 # * and the tag does not already exist
94 # * recover the suite name from the destination refs/dgit/ ref
95 # + disassemble the signed tag into its various fields and signature
97 # * parsing the first line of the tag message to recover
98 # the package name, version and suite
99 # * checking that the package name corresponds to the dest repo name
100 # * checking that the suite name is as recovered above
101 # + verify the signature on the signed tag
102 # and if necessary check that the keyid and package are listed in dm.txt
103 # + check various correspondences:
104 # * the signed tag must refer to a commit
105 # * the signed tag commit must be the refs/dgit value
106 # * the name in the signed tag must correspond to its ref name
107 # * the tag name must be [archive/]debian/<version> (massaged as needed)
108 # * the suite is one of those permitted
109 # * the signed tag has a suitable name
110 # * run the "push" policy hook
111 # * replay prevention for --deliberately-not-fast-forward
112 # * check the commit is a fast forward
113 # * handle a request from the policy hook for a fresh repo
114 # + push the signed tag and new dgit branch to the actual repo
116 # If the destination repo does not already exist, we need to make
117 # sure that we create it reasonably atomically, and also that
118 # we don't every have a destination repo containing no refs at all
119 # (because such a thing causes git-fetch-pack to barf). So then we
120 # do as above, except:
121 # - before starting, we take out our own lock for the destination repo
122 # - we create a prospective new destination repo by making a copy
124 # - we use the prospective new destination repo instead of the
125 # actual new destination repo (since the latter doesn't exist)
126 # - after git-receive-pack exits, we
127 # + check that the prospective repo contains a tag and head
128 # + rename the prospective destination repo into place
131 # - We are crash-only
132 # - Temporary working trees and their locks are cleaned up
133 # opportunistically by a program which tries to take each lock and
134 # if successful deletes both the tree and the lockfile
135 # - Prospective working trees and their locks are cleaned up by
136 # a program which tries to take each lock and if successful
137 # deletes any prospective working tree and the lock (but not
138 # of course any actual tree)
139 # - It is forbidden to _remove_ the lockfile without removing
140 # the corresponding temporary tree, as the lockfile is also
141 # a stampfile whose presence indicates that there may be
144 # Policy hook scripts are invoked like this:
145 # POLICY-HOOK-SCRIPT DISTRO DGIT-REPOS-DIR DGIT-LIVE-DIR DISTRO-DIR ACTION...
147 # POLICY-HOOK-SCRIPT ... check-list [...]
148 # POLICY-HOOK-SCRIPT ... check-package PACKAGE [...]
149 # POLICY-HOOK-SCRIPT ... push PACKAGE \
150 # VERSION SUITE TAGNAME DELIBERATELIES [...]
151 # POLICY-HOOK-SCRIPT ... push-confirm PACKAGE \
152 # VERSION SUITE TAGNAME DELIBERATELIES FRESH-REPO|'' [...]
154 # DELIBERATELIES is like this: --deliberately-foo,--deliberately-bar,...
156 # Exit status of policy hook is a bitmask.
157 # Bit weight constants are defined in Dgit.pm.
159 # suppress dgit-repos-server's fast-forward check ("push" only)
161 # blow away repo right away (ie, as if before push or fetch)
162 # ("check-package" and "push" only)
164 # suppress dgit-repos-server's check that commits do
165 # not lack "committer" info (eg as produced by #849041)
166 # any unexpected bits mean failure, and then known set bits are ignored
167 # if no unexpected bits set, operation continues (subject to meaning
168 # of any expected bits set). So, eg, exit 0 means "continue normally"
169 # and would be appropriate for an unknown action.
171 # cwd for push and push-confirm is a temporary repo where the incoming
172 # objects have been received; TAGNAME is the version-based tag.
174 # FRESH-REPO is '' iff the repo for this package already existed, or
175 # the pathname of the newly-created repo which will be renamed into
176 # place if everything goes well. (NB that this is generally not the
177 # same repo as the cwd, because the objects are first received into a
178 # temporary repo so they can be examined.) In this case FRESH-REPO
179 # contains exactly the objects and refs that will appear in the
180 # destination if push-confirm approves.
182 # if push requested FRESHREPO, push-confirm happens in the old working
183 # repo and FRESH-REPO is guaranteed not to be ''.
185 # policy hook for a particular package will be invoked only once at
186 # a time - (see comments about DGIT-REPOS-DIR, above)
188 # check-list and check-package are invoked via the --cron option.
189 # First, without any locking, check-list is called. It should produce
190 # a list of package names (one per line). Then check-package will be
191 # invoked for each named package, in each case after taking an
194 # If policy hook wants to run dgit (or something else in the dgit
195 # package), it should use DGIT-LIVE-DIR/dgit (etc.), or if that is
196 # ENOENT, use the installed version.
198 # Mirror hook scripts are invoked like this:
199 # MIRROR-HOOK-SCRIPT DISTRO-DIR ACTION...
200 # and currently there is only one action invoked by dgit-repos-server:
201 # MIRROR-HOOK-SCRIPT DISTRO-DIR updated-hook PACKAGE [...]
203 # Exit status of the mirror hook is advisory only. The mirror hook
204 # runs too late to do anything useful about a problem, so the only
205 # effect of a mirror hook exiting nonzero is a warning message to
206 # stderr (which the pushing user should end up seeing).
208 # If the mirror hook does not exist, it is silently skipped.
211 use Fcntl qw(:flock);
212 use File::Path qw(rmtree);
213 use File::Temp qw(tempfile);
222 our $suitesformasterfile;
237 #----- utilities -----
239 sub realdestrepo () { "$dgitrepos/$package.git"; }
241 sub acquirelock ($$) {
242 my ($lock, $must) = @_;
244 printdebug sprintf "locking %s %d\n", $lock, $must;
247 $fh = new IO::File $lock, ">" or die "open $lock: $!";
248 my $ok = flock $fh, $must ? LOCK_EX : (LOCK_EX|LOCK_NB);
250 die "flock $lock: $!" if $must;
251 printdebug " locking $lock failed\n";
254 next unless stat_exists $lock;
255 my $want = (stat _)[1];
257 my $got = (stat _)[1];
258 last if $got == $want;
263 sub acquirermtree ($$) {
264 my ($tree, $must) = @_;
265 my $fh = acquirelock("$tree.lock", $must);
273 sub locksometree ($) {
275 acquirelock("$tree.lock", 1);
278 sub lockrealtree () {
279 locksometree(realdestrepo);
282 sub mkrepotmp () { ensuredir "$dgitrepos/_tmp" };
284 sub removedtagsfile () { "$dgitrepos/_removed-tags/$package"; }
286 sub recorderror ($) {
288 my $w = $ENV{'DGIT_DRS_WORK'}; # we are in stunthook
291 open ERR, ">", "$w/drs-error" or die $!;
292 print ERR $why, "\n" or die $!;
301 recorderror "reject: $why";
302 die "\ndgit-repos-server: reject: $why\n\n";
309 die (shellquote @_)." $? $!" if $r;
313 my ($policyallowbits, @polargs) = @_;
314 # => ($exitstatuspolicybitmap);
315 die if $policyallowbits & ~0x3e;
316 my @cmd = ($policyhook,$distro,$dgitrepos,$dgitlive,$distrodir,@polargs);
319 die "system: $!" if $r < 0;
320 die "dgit-repos-server: policy hook failed (or rejected) ($?)\n"
321 if $r & ~($policyallowbits << 8);
322 printdebug sprintf "hook => %#x\n", $r;
326 sub mkemptyrepo ($$) {
327 my ($dir,$sharedperm) = @_;
328 runcmd qw(git init --bare --quiet), "--shared=$sharedperm", $dir;
331 sub mkrepo_fromtemplate ($) {
333 my $template = "$dgitrepos/_template";
334 my $templatelock = locksometree($template);
335 printdebug "copy template $template -> $dir\n";
336 my $r = system qw(cp -a --), $template, $dir;
337 !$r or die "create new repo $dir failed: $r $!";
341 sub movetogarbage () {
342 # realdestrepo must have been locked
344 my $real = realdestrepo;
345 return unless stat_exists $real;
347 my $garbagerepo = "$dgitrepos/${package}_garbage";
348 # We arrange to always keep at least one old tree, for recovery
349 # from mistakes. This is either $garbage or $garbage-old.
350 if (stat_exists "$garbagerepo") {
351 printdebug "movetogarbage: rmtree $garbagerepo-tmp\n";
352 rmtree "$garbagerepo-tmp";
353 if (rename "$garbagerepo-old", "$garbagerepo-tmp") {
354 printdebug "movetogarbage: $garbagerepo-old -> -tmp, rmtree\n";
355 rmtree "$garbagerepo-tmp";
357 die "$garbagerepo $!" unless $!==ENOENT;
358 printdebug "movetogarbage: $garbagerepo-old -> -tmp\n";
360 printdebug "movetogarbage: $garbagerepo -> -old\n";
361 rename "$garbagerepo", "$garbagerepo-old" or die "$garbagerepo $!";
364 ensuredir "$dgitrepos/_removed-tags";
365 open PREVIOUS, ">>", removedtagsfile or die removedtagsfile." $!";
366 git_for_each_ref([ map { 'refs/tags/'.$_ } debiantags('*',$distro) ],
368 my ($objid,$objtype,$fullrefname,$reftail) = @_;
369 print PREVIOUS "\n$objid $reftail .\n" or die $!;
371 close PREVIOUS or die $!;
373 printdebug "movetogarbage: $real -> $garbagerepo\n";
374 rename $real, $garbagerepo
376 or die "$garbagerepo $!";
379 sub policy_checkpackage () {
380 my $lfh = lockrealtree();
382 $policy = policyhook(FRESHREPO,'check-package',$package);
383 if ($policy & FRESHREPO) {
390 #----- git-receive-pack -----
392 sub fixmissing__git_receive_pack () {
394 $destrepo = "$dgitrepos/_tmp/${package}_prospective";
395 acquirermtree($destrepo, 1);
396 mkrepo_fromtemplate($destrepo);
399 sub makeworkingclone () {
401 $workrepo = "$dgitrepos/_tmp/${package}_incoming$$";
402 acquirermtree($workrepo, 1);
403 my $lfh = lockrealtree();
404 runcmd qw(git clone -l -q --mirror), $destrepo, $workrepo;
406 rmtree "${workrepo}_fresh";
409 sub setupstunthook () {
410 my $prerecv = "$workrepo/hooks/pre-receive";
411 my $fh = new IO::File $prerecv, O_WRONLY|O_CREAT|O_TRUNC, 0777
412 or die "$prerecv: $!";
413 print $fh <<END or die "$prerecv: $!";
416 exec $0 --pre-receive-hook $package
418 close $fh or die "$prerecv: $!";
419 $ENV{'DGIT_DRS_WORK'}= $workrepo;
420 $ENV{'DGIT_DRS_DEST'}= $destrepo;
421 printdebug " stunt hook set up $prerecv\n";
424 sub dealwithfreshrepo () {
425 my $freshrepo = "${workrepo}_fresh";
426 return unless stat_exists $freshrepo;
427 $destrepo = $freshrepo;
431 my @cmd = ($mirrorhook,$distrodir,@_);
433 return unless stat_exists $mirrorhook;
437 dgit-repos-server: warning: mirror hook failed: %s
438 dgit-repos-server: push complete but may not fully visible.
440 ($r < 0 ? "exec: $!" :
441 $r == (124 << 8) ? "exited status 124 (timeout?)" :
442 !($r & ~0xff00) ? "exited ".($? >> 8) :
447 sub maybeinstallprospective () {
448 return if $destrepo eq realdestrepo;
450 if (open REJ, "<", "$workrepo/drs-error") {
453 REJ->error and die $!;
457 $!==&ENOENT or die $!;
460 printdebug " show-ref ($destrepo) ...\n";
462 my $child = open SR, "-|";
463 defined $child or die $!;
465 chdir $destrepo or die $!;
466 exec qw(git show-ref);
469 my %got = qw(newtag 0 omtag 0 head 0);
472 printdebug " show-refs| $_\n";
473 s/^\S*[1-9a-f]\S* (\S+)$/$1/ or die;
474 next if m{^refs/heads/master$};
476 m{^refs/tags/archive/} ? 'newtag' :
477 m{^refs/tags/} ? 'omtag' :
478 m{^refs/dgit/} ? 'head' :
483 $!=0; $?=0; close SR or $?==256 or die "$? $!";
485 printdebug "installprospective ?\n";
486 die Dumper(\%got)." -- missing refs in new repo"
487 unless $got{head} && grep { m/tag$/ && $got{$_} } keys %got;
491 if ($destrepo eq "${workrepo}_fresh") {
495 printdebug "install $destrepo => ".realdestrepo."\n";
496 rename $destrepo, realdestrepo or die $!;
497 remove realdestrepo.".lock" or die $!;
500 sub main__git_receive_pack () {
503 runcmd qw(git receive-pack), $workrepo;
505 maybeinstallprospective();
506 mirrorhook('updated-hook', $package);
509 #----- stunt post-receive hook -----
511 our ($tagname, $tagval, $suite, $oldcommit, $commit);
512 our ($version, %tagh);
513 our ($maint_tagname, $maint_tagval);
515 our ($tagexists_error);
518 printdebug " updates ...\n";
522 printdebug " upd.| $_\n";
523 m/^(\S+) (\S+) (\S+)$/ or die "$_ ?";
524 my ($old, $sha1, $refname) = ($1, $2, $3);
525 if ($refname =~ m{^refs/tags/(?=(?:archive/)?$distro/)}) {
528 $tagexists_error= "tag $tn already exists -".
529 " not replacing previously-pushed version"
531 } elsif ($refname =~ m{^refs/dgit/}) {
532 reject "pushing multiple heads!" if defined $suite;
537 reject "pushing unexpected ref!";
540 STDIN->error and die $!;
542 reject "push is missing tag ref update" unless %tags;
543 my @newtags = grep { m#^archive/# } keys %tags;
544 my @omtags = grep { !m#^archive/# } keys %tags;
545 reject "pushing too many similar tags" if @newtags>1 || @omtags>1;
547 ($tagname) = @newtags;
548 ($maint_tagname) = @omtags;
550 ($tagname) = @omtags or die;
552 $tagval = $tags{$tagname};
553 $maint_tagval = $tags{$maint_tagname // ''};
555 reject "push is missing head ref update" unless defined $suite;
556 printdebug " updates ok.\n";
560 printdebug " parsetag...\n";
561 open PT, ">dgit-tmp/plaintext" or die $!;
562 open DS, ">dgit-tmp/plaintext.asc" or die $!;
563 open T, "-|", qw(git cat-file tag), $tagval or die $!;
565 $!=0; $_=<T>; defined or die $!;
567 if (m/^(\S+) (.*)/) {
568 push @{ $tagh{$1} }, $2;
575 $!=0; $_=<T>; defined or die $!;
576 m/^($package_re) release (\S+) for \S+ \((\S+)\) \[dgit\]$/ or
577 reject "tag message not in expected format";
579 die unless $1 eq $package;
581 die "$3 != $suite " unless $3 eq $suite;
585 print PT $copyl or die $!;
586 $!=0; $_=<T>; defined or die "missing signature? $!";
588 if (m/^\[dgit ([^"].*)\]$/) { # [dgit "something"] is for future
591 if (s/^distro\=(\S+) //) {
592 die "$1 != $distro" unless $1 eq $distro;
593 } elsif (s/^(--deliberately-$deliberately_re) //) {
594 push @deliberatelies, $1;
595 } elsif (s/^previously:(\S+)=(\w+) //) {
596 die "previously $1 twice" if defined $previously{$1};
597 $previously{$1} = $2;
598 } elsif (s/^[-+.=0-9a-z]\S* //) {
600 die "unknown dgit info in tag ($_)";
605 last if m/^-----BEGIN PGP/;
616 printdebug " parsetag ok.\n";
619 sub checksig_keyring ($) {
620 my ($keyringfile) = @_;
621 # returns primary-keyid if signed by a key in this keyring
623 # or dies on other errors
627 printdebug " checksig keyring $keyringfile...\n";
629 our @cmd = (qw(gpgv --status-fd=1 --keyring),
631 qw(dgit-tmp/plaintext.asc dgit-tmp/plaintext));
638 next unless s/^\[GNUPG:\] //;
640 printdebug " checksig| $_\n";
641 my @l = split / /, $_;
642 if ($l[0] eq 'NO_PUBKEY') {
644 } elsif ($l[0] eq 'VALIDSIG') {
646 $sigtype eq '00' or reject "signature is not of type 00!";
648 die unless defined $ok;
654 printdebug sprintf " checksig ok=%d\n", !!$ok;
659 sub dm_txt_check ($$) {
660 my ($keyid, $dmtxtfn) = @_;
661 printdebug " dm_txt_check $keyid $dmtxtfn\n";
662 open DT, '<', $dmtxtfn or die "$dmtxtfn $!";
664 m/^fingerprint:\s+\Q$keyid\E$/oi
666 if (s/^allow:/ /i..0) {
669 or reject "key $keyid missing Allow section in permissions!";
674 or reject "package $package not allowed for key $keyid";
679 printdebug " dm_txt_check allow| $_\n";
680 foreach my $p (split /\s+/) {
681 if ($p eq $package) {
683 printdebug " dm_txt_check ok\n";
688 DT->error and die $!;
690 reject "key $keyid not in permissions list although in keyring!";
694 foreach my $kas (split /:/, $keyrings) {
695 printdebug "verifytag $kas...\n";
696 $kas =~ s/^([^,]+),// or die;
697 my $keyid = checksig_keyring $1;
698 if (defined $keyid) {
699 if ($kas =~ m/^a$/) {
700 printdebug "verifytag a ok\n";
702 } elsif ($kas =~ m/^m([^,]+)$/) {
703 dm_txt_check($keyid, $1);
704 printdebug "verifytag m ok\n";
711 reject "key not found in keyrings";
714 sub suite_is_in ($) {
716 printdebug "suite_is_in ($sf)\n";
717 if (!open SUITES, "<", $sf) {
718 $!==ENOENT or die $!;
726 return 1 if $_ eq $suite;
728 die $! if SUITES->error;
733 printdebug "checksuite ($suitesfile)\n";
734 return if suite_is_in $suitesfile;
735 reject "unknown suite";
738 sub checktagnoreplay () {
739 # We need to prevent a replay attack using an earlier signed tag.
740 # We also want to archive in the history the object ids of
741 # anything we remove, even if we get rid of the actual objects.
743 # So, we check that the signed tag mentions the name and tag
746 # (a) In the case of FRESHREPO: all tags and refs/heads/* in
747 # the repo. That is, effectively, all the things we are
750 # This prevents any tag implying a FRESHREPO push
751 # being replayed into a different state of the repo.
753 # There is still the folowing risk: If a non-ff push is of a
754 # head which is an ancestor of a previous ff-only push, the
755 # previous push can be replayed.
757 # So we keep a separate list, as a file in the repo, of all
758 # the tag object ids we have ever seen and removed. Any such
759 # tag object id will be rejected even for ff-only pushes.
761 # (b) In the case of just NOFFCHECK: all tags referring to the
762 # current head for the suite (there must be at least one).
764 # This prevents any tag implying a NOFFCHECK push being
765 # replayed to rewind from a different head.
767 # The possibility of an earlier ff-only push being replayed is
768 # eliminated as follows: the tag from such a push would still
769 # be in our repo, and therefore the replayed push would be
770 # rejected because the set of refs being updated would be
773 if (!open PREVIOUS, "<", removedtagsfile) {
774 die removedtagsfile." $!" unless $!==ENOENT;
776 # Protocol for updating this file is to append to it, not
777 # write-new-and-rename. So all updates are prefixed with \n
778 # and suffixed with " .\n" so that partial writes can be
781 next unless m/^(\w+) (.*) \.\n/;
782 next unless $1 eq $tagval;
783 reject "Replay of previously-rewound upload ($tagval $2)";
785 die removedtagsfile." $!" if PREVIOUS->error;
789 return unless $policy & (FRESHREPO|NOFFCHECK);
791 my $garbagerepo = "$dgitrepos/${package}_garbage";
797 my $check_ref_previously= sub {
798 my ($objid,$objtype,$fullrefname,$reftail) = @_;
799 my $supkey = $fullrefname;
800 $supkey =~ s{^refs/}{} or die "$supkey $objid ?";
801 my $supobjid = $previously{$supkey};
802 if (!defined $supobjid) {
803 printdebug "checktagnoreply - missing\n";
804 push @problems, "does not declare previously $supkey";
805 } elsif ($supobjid ne $objid) {
806 push @problems, "declared previously $supkey=$supobjid".
807 " but actually previously $supkey=$objid";
813 if ($policy & FRESHREPO) {
814 foreach my $kind (qw(tags heads)) {
815 git_for_each_ref("refs/$kind", $check_ref_previously);
818 my $branch= server_branch($suite);
819 my $branchhead= git_get_ref(server_ref($suite));
820 if (!length $branchhead) {
821 # No such branch - NOFFCHECK was unnecessary. Oh well.
822 printdebug "checktagnoreplay - not FRESHREPO, new branch, ok\n";
824 printdebug "checktagnoreplay - not FRESHREPO,".
825 " checking for overwriting refs/$branch=$branchhead\n";
826 git_for_each_tag_referring($branchhead, sub {
827 my ($tagobjid,$refobjid,$fullrefname,$tagname) = @_;
828 $check_ref_previously->($tagobjid,undef,$fullrefname,undef);
830 printdebug "checktagnoreplay - not FRESHREPO, nchecked=$nchecked";
831 push @problems, "does not declare previously any tag".
832 " referring to branch head $branch=$branchhead"
838 reject "replay attack prevention check failed:".
839 " signed tag for $version: ".
840 join("; ", @problems).
843 printdebug "checktagnoreplay - all ok ($tagval)\n"
848 my $vals = $tagh{$tag};
849 reject "missing header $tag in signed tag object" unless $vals;
850 reject "multiple headers $tag in signed tag object" unless @$vals == 1;
855 printdebug "checks\n";
857 tagh1('type') eq 'commit' or reject "tag refers to wrong kind of object";
858 tagh1('object') eq $commit or reject "tag refers to wrong commit";
859 tagh1('tag') eq $tagname or reject "tag name in tag is wrong";
861 my @expecttagnames = debiantags($version, $distro);
862 printdebug "expected tag @expecttagnames\n";
863 grep { $tagname eq $_ } @expecttagnames or die;
865 foreach my $othertag (grep { $_ ne $tagname } @expecttagnames) {
866 reject "tag $othertag (pushed with differing dgit version)".
868 " not replacing previously-pushed version"
869 if git_get_ref "refs/tags/".$othertag;
874 @policy_args = ($package,$version,$suite,$tagname,
875 join(",",@deliberatelies));
876 $policy = policyhook(NOFFCHECK|FRESHREPO, 'push', @policy_args);
878 if (defined $tagexists_error) {
879 if ($policy & FRESHREPO) {
880 printdebug "ignoring tagexists_error: $tagexists_error\n";
882 reject $tagexists_error;
889 # check that our ref is being fast-forwarded
890 printdebug "oldcommit $oldcommit\n";
891 if (!($policy & NOFFCHECK) && $oldcommit =~ m/[^0]/) {
892 $?=0; $!=0; my $mb = `git merge-base $commit $oldcommit`;
894 $mb eq $oldcommit or reject "not fast forward on dgit branch";
897 # defend against commits generated by #849041
898 if (!($policy & NOCOMMITCHECK)) {
899 my @checks = qw(%an %ae %at
901 my @chk = qw(git log -z);
902 push @chk, '--pretty=tformat:%H%n'.
903 (join "", map { $_, '%n' } @checks);
904 push @chk, "^$oldcommit" if $oldcommit =~ m/[^0]/;
906 printdebug " ~NOCOMMITCHECK @chk\n";
907 open CHK, "-|", @chk or die $!;
911 m/^\w+(?=\n)/ or die;
912 reject "corrupted object $& (missing metadata)";
914 $!=0; $?=0; close CHK or $?==256 or die "$? $!";
917 if ($policy & FRESHREPO) {
918 # It's a bit late to be discovering this here, isn't it ?
920 # What we do is: Generate a fresh destination repo right now,
921 # and arrange to treat it from now on as if it were a
924 # The presence of this fresh destination repo is detected by
925 # the parent, which responds by making a fresh master repo
926 # from the template. (If the repo didn't already exist then
927 # $destrepo was _prospective, and we change it here. This is
928 # OK because the parent's check for _fresh persuades it not to
931 $destrepo = "${workrepo}_fresh"; # workrepo lock covers
932 mkrepo_fromtemplate $destrepo;
937 my @cmdbase = (qw(git send-pack), $destrepo);
938 push @cmdbase, qw(--force) if $policy & NOFFCHECK;
941 push @cmd, "$commit:refs/dgit/$suite",
942 "$tagval:refs/tags/$tagname";
943 push @cmd, "$maint_tagval:refs/tags/$maint_tagname"
944 if defined $maint_tagname;
948 !$r or die "onward push to $destrepo failed: $r $!";
950 if (suite_is_in $suitesformasterfile) {
952 push @cmd, "$commit:refs/heads/master";
954 $!=0; my $r = system @cmd;
955 # tolerate errors (might be not ff)
956 !($r & ~0xff00) or die
957 "onward push to $destrepo#master failed: $r $!";
961 sub finalisepush () {
962 if ($destrepo eq realdestrepo) {
963 policyhook(0, 'push-confirm', @policy_args, '');
966 # We are to receive the push into a new repo (perhaps
967 # because the policy push hook asked us to with FRESHREPO, or
968 # perhaps because the repo didn't exist before).
970 # We want to provide the policy push-confirm hook with a repo
971 # which looks like the one which is going to be installed.
972 # The working repo is no good because it might contain
975 # So we push the objects into the prospective new repo right
976 # away. If the hook declines, we decline, and the prospective
977 # repo is never installed.
979 policyhook(0, 'push-confirm', @policy_args, $destrepo);
984 printdebug "stunthook in $workrepo\n";
985 chdir $workrepo or die "chdir $workrepo: $!";
986 mkdir "dgit-tmp" or $!==EEXIST or die $!;
992 printdebug "stunthook done.\n";
995 #----- git-upload-pack -----
997 sub fixmissing__git_upload_pack () {
998 $destrepo = "$dgitrepos/_empty";
999 my $lfh = locksometree($destrepo);
1000 return if stat_exists $destrepo;
1001 rmtree "$destrepo.new";
1002 mkemptyrepo "$destrepo.new", "0644";
1003 rename "$destrepo.new", $destrepo or die $!;
1004 unlink "$destrepo.lock" or die $!;
1008 sub main__git_upload_pack () {
1009 my $lfh = locksometree($destrepo);
1010 printdebug "git-upload-pack in $destrepo\n";
1011 chdir $destrepo or die "$destrepo: $!";
1013 runcmd qw(git upload-pack), ".";
1016 #----- arg parsing and main program -----
1020 my $v = shift @ARGV;
1025 our %indistrodir = (
1026 # keys are used for DGIT_DRS_XXX too
1027 'repos' => \$dgitrepos,
1028 'suites' => \$suitesfile,
1029 'suites-master' => \$suitesformasterfile,
1030 'policy-hook' => \$policyhook,
1031 'mirror-hook' => \$mirrorhook,
1032 'dgit-live' => \$dgitlive,
1035 our @hookenvs = qw(distro suitesfile suitesformasterfile policyhook
1036 mirrorhook dgitlive keyrings dgitrepos distrodir);
1038 # workrepo and destrepo handled ad-hoc
1043 my $cmd = $ENV{'SSH_ORIGINAL_COMMAND'};
1053 or reject "command string not understood";
1057 my $funcn = $method;
1059 my $mainfunc = $main::{"main__$funcn"};
1061 reject "unknown method" unless $mainfunc;
1063 policy_checkpackage();
1065 if (stat_exists realdestrepo) {
1066 $destrepo = realdestrepo;
1068 printdebug " fixmissing $funcn\n";
1069 my $fixfunc = $main::{"fixmissing__$funcn"};
1073 printdebug " running main $funcn\n";
1080 my $listfh = tempfile();
1081 open STDOUT, ">&", $listfh or die $!;
1082 policyhook(0,'check-list');
1083 open STDOUT, ">&STDERR" or die $!;
1085 seek $listfh, 0, 0 or die $!;
1090 die unless m/^($package_re)$/;
1093 policy_checkpackage();
1095 die $! if $listfh->error;
1098 sub parseargsdispatch () {
1101 delete $ENV{'GIT_DIR'}; # if not run via ssh, our parent git process
1102 delete $ENV{'GIT_PREFIX'}; # sets these and they mess things up
1104 if ($ENV{'DGIT_DRS_DEBUG'}) {
1108 if ($ARGV[0] eq '--pre-receive-hook') {
1111 printdebug "in stunthook ".(shellquote @ARGV)."\n";
1112 foreach my $k (sort keys %ENV) {
1113 printdebug "$k=$ENV{$k}\n" if $k =~ m/^DGIT/;
1118 $package = shift @ARGV;
1119 ${ $main::{$_} } = $ENV{"DGIT_DRS_\U$_"} foreach @hookenvs;
1120 defined($workrepo = $ENV{'DGIT_DRS_WORK'}) or die;
1121 defined($destrepo = $ENV{'DGIT_DRS_DEST'}) or die;
1122 open STDOUT, ">&STDERR" or die $!;
1127 recorderror "$@" or die;
1134 $distrodir = argval();
1135 $keyrings = argval();
1137 foreach my $dk (keys %indistrodir) {
1138 ${ $indistrodir{$dk} } = "$distrodir/$dk";
1141 while (@ARGV && $ARGV[0] =~ m/^--([-0-9a-z]+)=/ && $indistrodir{$1}) {
1142 ${ $indistrodir{$1} } = $'; #';
1146 $ENV{"DGIT_DRS_\U$_"} = ${ $main::{$_} } foreach @hookenvs;
1148 die unless @ARGV==1;
1150 my $mode = shift @ARGV;
1151 die unless $mode =~ m/^--(\w+)$/;
1152 my $fn = ${*::}{"mode_$1"};
1158 while (my $fh = pop @lockfhs) { close $fh; }
1163 if (!chdir "$dgitrepos/_tmp") {
1164 $!==ENOENT or die $!;
1167 foreach my $lf (<*.lock>) {
1169 $tree =~ s/\.lock$//;
1170 next unless acquirermtree($tree, 0);
1171 remove $lf or warn $!;
1176 parseargsdispatch();