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)
163 # any unexpected bits mean failure, and then known set bits are ignored
164 # if no unexpected bits set, operation continues (subject to meaning
165 # of any expected bits set). So, eg, exit 0 means "continue normally"
166 # and would be appropriate for an unknown action.
168 # cwd for push and push-confirm is a temporary repo where the incoming
169 # objects have been received; TAGNAME is the version-based tag.
171 # FRESH-REPO is '' iff the repo for this package already existed, or
172 # the pathname of the newly-created repo which will be renamed into
173 # place if everything goes well. (NB that this is generally not the
174 # same repo as the cwd, because the objects are first received into a
175 # temporary repo so they can be examined.) In this case FRESH-REPO
176 # contains exactly the objects and refs that will appear in the
177 # destination if push-confirm approves.
179 # if push requested FRESHREPO, push-confirm happens in the old working
180 # repo and FRESH-REPO is guaranteed not to be ''.
182 # policy hook for a particular package will be invoked only once at
183 # a time - (see comments about DGIT-REPOS-DIR, above)
185 # check-list and check-package are invoked via the --cron option.
186 # First, without any locking, check-list is called. It should produce
187 # a list of package names (one per line). Then check-package will be
188 # invoked for each named package, in each case after taking an
191 # If policy hook wants to run dgit (or something else in the dgit
192 # package), it should use DGIT-LIVE-DIR/dgit (etc.), or if that is
193 # ENOENT, use the installed version.
195 # Mirror hook scripts are invoked like this:
196 # MIRROR-HOOK-SCRIPT DISTRO-DIR ACTION...
197 # and currently there is only one action invoked by dgit-repos-server:
198 # MIRROR-HOOK-SCRIPT DISTRO-DIR updated-hook PACKAGE [...]
200 # Exit status of the mirror hook is advisory only. The mirror hook
201 # runs too late to do anything useful about a problem, so the only
202 # effect of a mirror hook exiting nonzero is a warning message to
203 # stderr (which the pushing user should end up seeing).
205 # If the mirror hook does not exist, it is silently skipped.
208 use Fcntl qw(:flock);
209 use File::Path qw(rmtree);
210 use File::Temp qw(tempfile);
219 our $suitesformasterfile;
234 #----- utilities -----
236 sub realdestrepo () { "$dgitrepos/$package.git"; }
238 sub acquirelock ($$) {
239 my ($lock, $must) = @_;
241 printdebug sprintf "locking %s %d\n", $lock, $must;
244 $fh = new IO::File $lock, ">" or die "open $lock: $!";
245 my $ok = flock $fh, $must ? LOCK_EX : (LOCK_EX|LOCK_NB);
247 die "flock $lock: $!" if $must;
248 printdebug " locking $lock failed\n";
251 next unless stat_exists $lock;
252 my $want = (stat _)[1];
254 my $got = (stat _)[1];
255 last if $got == $want;
260 sub acquirermtree ($$) {
261 my ($tree, $must) = @_;
262 my $fh = acquirelock("$tree.lock", $must);
270 sub locksometree ($) {
272 acquirelock("$tree.lock", 1);
275 sub lockrealtree () {
276 locksometree(realdestrepo);
279 sub mkrepotmp () { ensuredir "$dgitrepos/_tmp" };
281 sub removedtagsfile () { "$dgitrepos/_removed-tags/$package"; }
283 sub recorderror ($) {
285 my $w = $ENV{'DGIT_DRS_WORK'}; # we are in stunthook
288 open ERR, ">", "$w/drs-error" or die $!;
289 print ERR $why, "\n" or die $!;
298 recorderror "reject: $why";
299 die "\ndgit-repos-server: reject: $why\n\n";
306 die (shellquote @_)." $? $!" if $r;
310 my ($policyallowbits, @polargs) = @_;
311 # => ($exitstatuspolicybitmap);
312 die if $policyallowbits & ~0x3e;
313 my @cmd = ($policyhook,$distro,$dgitrepos,$dgitlive,$distrodir,@polargs);
316 die "system: $!" if $r < 0;
317 die "dgit-repos-server: policy hook failed (or rejected) ($?)\n"
318 if $r & ~($policyallowbits << 8);
319 printdebug sprintf "hook => %#x\n", $r;
323 sub mkemptyrepo ($$) {
324 my ($dir,$sharedperm) = @_;
325 runcmd qw(git init --bare --quiet), "--shared=$sharedperm", $dir;
328 sub mkrepo_fromtemplate ($) {
330 my $template = "$dgitrepos/_template";
331 my $templatelock = locksometree($template);
332 printdebug "copy template $template -> $dir\n";
333 my $r = system qw(cp -a --), $template, $dir;
334 !$r or die "create new repo $dir failed: $r $!";
338 sub movetogarbage () {
339 # realdestrepo must have been locked
341 my $real = realdestrepo;
342 return unless stat_exists $real;
344 my $garbagerepo = "$dgitrepos/${package}_garbage";
345 # We arrange to always keep at least one old tree, for recovery
346 # from mistakes. This is either $garbage or $garbage-old.
347 if (stat_exists "$garbagerepo") {
348 printdebug "movetogarbage: rmtree $garbagerepo-tmp\n";
349 rmtree "$garbagerepo-tmp";
350 if (rename "$garbagerepo-old", "$garbagerepo-tmp") {
351 printdebug "movetogarbage: $garbagerepo-old -> -tmp, rmtree\n";
352 rmtree "$garbagerepo-tmp";
354 die "$garbagerepo $!" unless $!==ENOENT;
355 printdebug "movetogarbage: $garbagerepo-old -> -tmp\n";
357 printdebug "movetogarbage: $garbagerepo -> -old\n";
358 rename "$garbagerepo", "$garbagerepo-old" or die "$garbagerepo $!";
361 ensuredir "$dgitrepos/_removed-tags";
362 open PREVIOUS, ">>", removedtagsfile or die removedtagsfile." $!";
363 git_for_each_ref([ map { 'refs/tags/'.$_ } debiantags('*',$distro) ],
365 my ($objid,$objtype,$fullrefname,$reftail) = @_;
366 print PREVIOUS "\n$objid $reftail .\n" or die $!;
368 close PREVIOUS or die $!;
370 printdebug "movetogarbage: $real -> $garbagerepo\n";
371 rename $real, $garbagerepo
373 or die "$garbagerepo $!";
376 sub policy_checkpackage () {
377 my $lfh = lockrealtree();
379 $policy = policyhook(FRESHREPO,'check-package',$package);
380 if ($policy & FRESHREPO) {
387 #----- git-receive-pack -----
389 sub fixmissing__git_receive_pack () {
391 $destrepo = "$dgitrepos/_tmp/${package}_prospective";
392 acquirermtree($destrepo, 1);
393 mkrepo_fromtemplate($destrepo);
396 sub makeworkingclone () {
398 $workrepo = "$dgitrepos/_tmp/${package}_incoming$$";
399 acquirermtree($workrepo, 1);
400 my $lfh = lockrealtree();
401 runcmd qw(git clone -l -q --mirror), $destrepo, $workrepo;
403 rmtree "${workrepo}_fresh";
406 sub setupstunthook () {
407 my $prerecv = "$workrepo/hooks/pre-receive";
408 my $fh = new IO::File $prerecv, O_WRONLY|O_CREAT|O_TRUNC, 0777
409 or die "$prerecv: $!";
410 print $fh <<END or die "$prerecv: $!";
413 exec $0 --pre-receive-hook $package
415 close $fh or die "$prerecv: $!";
416 $ENV{'DGIT_DRS_WORK'}= $workrepo;
417 $ENV{'DGIT_DRS_DEST'}= $destrepo;
418 printdebug " stunt hook set up $prerecv\n";
421 sub dealwithfreshrepo () {
422 my $freshrepo = "${workrepo}_fresh";
423 return unless stat_exists $freshrepo;
424 $destrepo = $freshrepo;
428 my @cmd = ($mirrorhook,$distrodir,@_);
430 return unless stat_exists $mirrorhook;
434 dgit-repos-server: warning: mirror hook failed: %s
435 dgit-repos-server: push complete but may not fully visible.
437 ($r < 0 ? "exec: $!" :
438 $r == (124 << 8) ? "exited status 124 (timeout?)" :
439 !($r & ~0xff00) ? "exited ".($? >> 8) :
444 sub maybeinstallprospective () {
445 return if $destrepo eq realdestrepo;
447 if (open REJ, "<", "$workrepo/drs-error") {
450 REJ->error and die $!;
454 $!==&ENOENT or die $!;
457 printdebug " show-ref ($destrepo) ...\n";
459 my $child = open SR, "-|";
460 defined $child or die $!;
462 chdir $destrepo or die $!;
463 exec qw(git show-ref);
466 my %got = qw(newtag 0 omtag 0 head 0);
469 printdebug " show-refs| $_\n";
470 s/^\S*[1-9a-f]\S* (\S+)$/$1/ or die;
471 next if m{^refs/heads/master$};
473 m{^refs/tags/archive/} ? 'newtag' :
474 m{^refs/tags/} ? 'omtag' :
475 m{^refs/dgit/} ? 'head' :
480 $!=0; $?=0; close SR or $?==256 or die "$? $!";
482 printdebug "installprospective ?\n";
483 die Dumper(\%got)." -- missing refs in new repo"
484 unless $got{head} && grep { m/tag$/ && $got{$_} } keys %got;
488 if ($destrepo eq "${workrepo}_fresh") {
492 printdebug "install $destrepo => ".realdestrepo."\n";
493 rename $destrepo, realdestrepo or die $!;
494 remove realdestrepo.".lock" or die $!;
497 sub main__git_receive_pack () {
500 runcmd qw(git receive-pack), $workrepo;
502 maybeinstallprospective();
503 mirrorhook('updated-hook', $package);
506 #----- stunt post-receive hook -----
508 our ($tagname, $tagval, $suite, $oldcommit, $commit);
509 our ($version, %tagh);
510 our ($maint_tagname, $maint_tagval);
512 our ($tagexists_error);
515 printdebug " updates ...\n";
519 printdebug " upd.| $_\n";
520 m/^(\S+) (\S+) (\S+)$/ or die "$_ ?";
521 my ($old, $sha1, $refname) = ($1, $2, $3);
522 if ($refname =~ m{^refs/tags/(?=(?:archive/)?$distro/)}) {
525 $tagexists_error= "tag $tn already exists -".
526 " not replacing previously-pushed version"
528 } elsif ($refname =~ m{^refs/dgit/}) {
529 reject "pushing multiple heads!" if defined $suite;
534 reject "pushing unexpected ref!";
537 STDIN->error and die $!;
539 reject "push is missing tag ref update" unless %tags;
540 my @newtags = grep { m#^archive/# } keys %tags;
541 my @omtags = grep { !m#^archive/# } keys %tags;
542 reject "pushing too many similar tags" if @newtags>1 || @omtags>1;
544 ($tagname) = @newtags;
545 ($maint_tagname) = @omtags;
547 ($tagname) = @omtags or die;
549 $tagval = $tags{$tagname};
550 $maint_tagval = $tags{$maint_tagname // ''};
552 reject "push is missing head ref update" unless defined $suite;
553 printdebug " updates ok.\n";
557 printdebug " parsetag...\n";
558 open PT, ">dgit-tmp/plaintext" or die $!;
559 open DS, ">dgit-tmp/plaintext.asc" or die $!;
560 open T, "-|", qw(git cat-file tag), $tagval or die $!;
562 $!=0; $_=<T>; defined or die $!;
564 if (m/^(\S+) (.*)/) {
565 push @{ $tagh{$1} }, $2;
572 $!=0; $_=<T>; defined or die $!;
573 m/^($package_re) release (\S+) for \S+ \((\S+)\) \[dgit\]$/ or
574 reject "tag message not in expected format";
576 die unless $1 eq $package;
578 die "$3 != $suite " unless $3 eq $suite;
582 print PT $copyl or die $!;
583 $!=0; $_=<T>; defined or die "missing signature? $!";
585 if (m/^\[dgit ([^"].*)\]$/) { # [dgit "something"] is for future
588 if (s/^distro\=(\S+) //) {
589 die "$1 != $distro" unless $1 eq $distro;
590 } elsif (s/^(--deliberately-$deliberately_re) //) {
591 push @deliberatelies, $1;
592 } elsif (s/^previously:(\S+)=(\w+) //) {
593 die "previously $1 twice" if defined $previously{$1};
594 $previously{$1} = $2;
595 } elsif (s/^[-+.=0-9a-z]\S* //) {
597 die "unknown dgit info in tag ($_)";
602 last if m/^-----BEGIN PGP/;
613 printdebug " parsetag ok.\n";
616 sub checksig_keyring ($) {
617 my ($keyringfile) = @_;
618 # returns primary-keyid if signed by a key in this keyring
620 # or dies on other errors
624 printdebug " checksig keyring $keyringfile...\n";
626 our @cmd = (qw(gpgv --status-fd=1 --keyring),
628 qw(dgit-tmp/plaintext.asc dgit-tmp/plaintext));
635 next unless s/^\[GNUPG:\] //;
637 printdebug " checksig| $_\n";
638 my @l = split / /, $_;
639 if ($l[0] eq 'NO_PUBKEY') {
641 } elsif ($l[0] eq 'VALIDSIG') {
643 $sigtype eq '00' or reject "signature is not of type 00!";
645 die unless defined $ok;
651 printdebug sprintf " checksig ok=%d\n", !!$ok;
656 sub dm_txt_check ($$) {
657 my ($keyid, $dmtxtfn) = @_;
658 printdebug " dm_txt_check $keyid $dmtxtfn\n";
659 open DT, '<', $dmtxtfn or die "$dmtxtfn $!";
661 m/^fingerprint:\s+\Q$keyid\E$/oi
663 if (s/^allow:/ /i..0) {
666 or reject "key $keyid missing Allow section in permissions!";
671 or reject "package $package not allowed for key $keyid";
676 printdebug " dm_txt_check allow| $_\n";
677 foreach my $p (split /\s+/) {
678 if ($p eq $package) {
680 printdebug " dm_txt_check ok\n";
685 DT->error and die $!;
687 reject "key $keyid not in permissions list although in keyring!";
691 foreach my $kas (split /:/, $keyrings) {
692 printdebug "verifytag $kas...\n";
693 $kas =~ s/^([^,]+),// or die;
694 my $keyid = checksig_keyring $1;
695 if (defined $keyid) {
696 if ($kas =~ m/^a$/) {
697 printdebug "verifytag a ok\n";
699 } elsif ($kas =~ m/^m([^,]+)$/) {
700 dm_txt_check($keyid, $1);
701 printdebug "verifytag m ok\n";
708 reject "key not found in keyrings";
711 sub suite_is_in ($) {
713 printdebug "suite_is_in ($sf)\n";
714 if (!open SUITES, "<", $sf) {
715 $!==ENOENT or die $!;
723 return 1 if $_ eq $suite;
725 die $! if SUITES->error;
730 printdebug "checksuite ($suitesfile)\n";
731 return if suite_is_in $suitesfile;
732 reject "unknown suite";
735 sub checktagnoreplay () {
736 # We need to prevent a replay attack using an earlier signed tag.
737 # We also want to archive in the history the object ids of
738 # anything we remove, even if we get rid of the actual objects.
740 # So, we check that the signed tag mentions the name and tag
743 # (a) In the case of FRESHREPO: all tags and refs/heads/* in
744 # the repo. That is, effectively, all the things we are
747 # This prevents any tag implying a FRESHREPO push
748 # being replayed into a different state of the repo.
750 # There is still the folowing risk: If a non-ff push is of a
751 # head which is an ancestor of a previous ff-only push, the
752 # previous push can be replayed.
754 # So we keep a separate list, as a file in the repo, of all
755 # the tag object ids we have ever seen and removed. Any such
756 # tag object id will be rejected even for ff-only pushes.
758 # (b) In the case of just NOFFCHECK: all tags referring to the
759 # current head for the suite (there must be at least one).
761 # This prevents any tag implying a NOFFCHECK push being
762 # replayed to rewind from a different head.
764 # The possibility of an earlier ff-only push being replayed is
765 # eliminated as follows: the tag from such a push would still
766 # be in our repo, and therefore the replayed push would be
767 # rejected because the set of refs being updated would be
770 if (!open PREVIOUS, "<", removedtagsfile) {
771 die removedtagsfile." $!" unless $!==ENOENT;
773 # Protocol for updating this file is to append to it, not
774 # write-new-and-rename. So all updates are prefixed with \n
775 # and suffixed with " .\n" so that partial writes can be
778 next unless m/^(\w+) (.*) \.\n/;
779 next unless $1 eq $tagval;
780 reject "Replay of previously-rewound upload ($tagval $2)";
782 die removedtagsfile." $!" if PREVIOUS->error;
786 return unless $policy & (FRESHREPO|NOFFCHECK);
788 my $garbagerepo = "$dgitrepos/${package}_garbage";
794 my $check_ref_previously= sub {
795 my ($objid,$objtype,$fullrefname,$reftail) = @_;
796 my $supkey = $fullrefname;
797 $supkey =~ s{^refs/}{} or die "$supkey $objid ?";
798 my $supobjid = $previously{$supkey};
799 if (!defined $supobjid) {
800 printdebug "checktagnoreply - missing\n";
801 push @problems, "does not declare previously $supkey";
802 } elsif ($supobjid ne $objid) {
803 push @problems, "declared previously $supkey=$supobjid".
804 " but actually previously $supkey=$objid";
810 if ($policy & FRESHREPO) {
811 foreach my $kind (qw(tags heads)) {
812 git_for_each_ref("refs/$kind", $check_ref_previously);
815 my $branch= server_branch($suite);
816 my $branchhead= git_get_ref(server_ref($suite));
817 if (!length $branchhead) {
818 # No such branch - NOFFCHECK was unnecessary. Oh well.
819 printdebug "checktagnoreplay - not FRESHREPO, new branch, ok\n";
821 printdebug "checktagnoreplay - not FRESHREPO,".
822 " checking for overwriting refs/$branch=$branchhead\n";
823 git_for_each_tag_referring($branchhead, sub {
824 my ($tagobjid,$refobjid,$fullrefname,$tagname) = @_;
825 $check_ref_previously->($tagobjid,undef,$fullrefname,undef);
827 printdebug "checktagnoreplay - not FRESHREPO, nchecked=$nchecked";
828 push @problems, "does not declare previously any tag".
829 " referring to branch head $branch=$branchhead"
835 reject "replay attack prevention check failed:".
836 " signed tag for $version: ".
837 join("; ", @problems).
840 printdebug "checktagnoreplay - all ok ($tagval)\n"
845 my $vals = $tagh{$tag};
846 reject "missing header $tag in signed tag object" unless $vals;
847 reject "multiple headers $tag in signed tag object" unless @$vals == 1;
852 printdebug "checks\n";
854 tagh1('type') eq 'commit' or reject "tag refers to wrong kind of object";
855 tagh1('object') eq $commit or reject "tag refers to wrong commit";
856 tagh1('tag') eq $tagname or reject "tag name in tag is wrong";
858 my @expecttagnames = debiantags($version, $distro);
859 printdebug "expected tag @expecttagnames\n";
860 grep { $tagname eq $_ } @expecttagnames or die;
862 foreach my $othertag (grep { $_ ne $tagname } @expecttagnames) {
863 reject "tag $othertag (pushed with differing dgit version)".
865 " not replacing previously-pushed version"
866 if git_get_ref "refs/tags/".$othertag;
871 @policy_args = ($package,$version,$suite,$tagname,
872 join(",",@deliberatelies));
873 $policy = policyhook(NOFFCHECK|FRESHREPO, 'push', @policy_args);
875 if (defined $tagexists_error) {
876 if ($policy & FRESHREPO) {
877 printdebug "ignoring tagexists_error: $tagexists_error\n";
879 reject $tagexists_error;
886 # check that our ref is being fast-forwarded
887 printdebug "oldcommit $oldcommit\n";
888 if (!($policy & NOFFCHECK) && $oldcommit =~ m/[^0]/) {
889 $?=0; $!=0; my $mb = `git merge-base $commit $oldcommit`;
891 $mb eq $oldcommit or reject "not fast forward on dgit branch";
893 if ($policy & FRESHREPO) {
894 # It's a bit late to be discovering this here, isn't it ?
896 # What we do is: Generate a fresh destination repo right now,
897 # and arrange to treat it from now on as if it were a
900 # The presence of this fresh destination repo is detected by
901 # the parent, which responds by making a fresh master repo
902 # from the template. (If the repo didn't already exist then
903 # $destrepo was _prospective, and we change it here. This is
904 # OK because the parent's check for _fresh persuades it not to
907 $destrepo = "${workrepo}_fresh"; # workrepo lock covers
908 mkrepo_fromtemplate $destrepo;
913 my @cmdbase = (qw(git send-pack), $destrepo);
914 push @cmdbase, qw(--force) if $policy & NOFFCHECK;
917 push @cmd, "$commit:refs/dgit/$suite",
918 "$tagval:refs/tags/$tagname";
919 push @cmd, "$maint_tagval:refs/tags/$maint_tagname"
920 if defined $maint_tagname;
924 !$r or die "onward push to $destrepo failed: $r $!";
926 if (suite_is_in $suitesformasterfile) {
928 push @cmd, "$commit:refs/heads/master";
930 $!=0; my $r = system @cmd;
931 # tolerate errors (might be not ff)
932 !($r & ~0xff00) or die
933 "onward push to $destrepo#master failed: $r $!";
937 sub finalisepush () {
938 if ($destrepo eq realdestrepo) {
939 policyhook(0, 'push-confirm', @policy_args, '');
942 # We are to receive the push into a new repo (perhaps
943 # because the policy push hook asked us to with FRESHREPO, or
944 # perhaps because the repo didn't exist before).
946 # We want to provide the policy push-confirm hook with a repo
947 # which looks like the one which is going to be installed.
948 # The working repo is no good because it might contain
951 # So we push the objects into the prospective new repo right
952 # away. If the hook declines, we decline, and the prospective
953 # repo is never installed.
955 policyhook(0, 'push-confirm', @policy_args, $destrepo);
960 printdebug "stunthook in $workrepo\n";
961 chdir $workrepo or die "chdir $workrepo: $!";
962 mkdir "dgit-tmp" or $!==EEXIST or die $!;
968 printdebug "stunthook done.\n";
971 #----- git-upload-pack -----
973 sub fixmissing__git_upload_pack () {
974 $destrepo = "$dgitrepos/_empty";
975 my $lfh = locksometree($destrepo);
976 return if stat_exists $destrepo;
977 rmtree "$destrepo.new";
978 mkemptyrepo "$destrepo.new", "0644";
979 rename "$destrepo.new", $destrepo or die $!;
980 unlink "$destrepo.lock" or die $!;
984 sub main__git_upload_pack () {
985 my $lfh = locksometree($destrepo);
986 printdebug "git-upload-pack in $destrepo\n";
987 chdir $destrepo or die "$destrepo: $!";
989 runcmd qw(git upload-pack), ".";
992 #----- arg parsing and main program -----
1001 our %indistrodir = (
1002 # keys are used for DGIT_DRS_XXX too
1003 'repos' => \$dgitrepos,
1004 'suites' => \$suitesfile,
1005 'suites-master' => \$suitesformasterfile,
1006 'policy-hook' => \$policyhook,
1007 'mirror-hook' => \$mirrorhook,
1008 'dgit-live' => \$dgitlive,
1011 our @hookenvs = qw(distro suitesfile suitesformasterfile policyhook
1012 mirrorhook dgitlive keyrings dgitrepos distrodir);
1014 # workrepo and destrepo handled ad-hoc
1019 my $cmd = $ENV{'SSH_ORIGINAL_COMMAND'};
1029 or reject "command string not understood";
1033 my $funcn = $method;
1035 my $mainfunc = $main::{"main__$funcn"};
1037 reject "unknown method" unless $mainfunc;
1039 policy_checkpackage();
1041 if (stat_exists realdestrepo) {
1042 $destrepo = realdestrepo;
1044 printdebug " fixmissing $funcn\n";
1045 my $fixfunc = $main::{"fixmissing__$funcn"};
1049 printdebug " running main $funcn\n";
1056 my $listfh = tempfile();
1057 open STDOUT, ">&", $listfh or die $!;
1058 policyhook(0,'check-list');
1059 open STDOUT, ">&STDERR" or die $!;
1061 seek $listfh, 0, 0 or die $!;
1066 die unless m/^($package_re)$/;
1069 policy_checkpackage();
1071 die $! if $listfh->error;
1074 sub parseargsdispatch () {
1077 delete $ENV{'GIT_DIR'}; # if not run via ssh, our parent git process
1078 delete $ENV{'GIT_PREFIX'}; # sets these and they mess things up
1080 if ($ENV{'DGIT_DRS_DEBUG'}) {
1084 if ($ARGV[0] eq '--pre-receive-hook') {
1087 printdebug "in stunthook ".(shellquote @ARGV)."\n";
1088 foreach my $k (sort keys %ENV) {
1089 printdebug "$k=$ENV{$k}\n" if $k =~ m/^DGIT/;
1094 $package = shift @ARGV;
1095 ${ $main::{$_} } = $ENV{"DGIT_DRS_\U$_"} foreach @hookenvs;
1096 defined($workrepo = $ENV{'DGIT_DRS_WORK'}) or die;
1097 defined($destrepo = $ENV{'DGIT_DRS_DEST'}) or die;
1098 open STDOUT, ">&STDERR" or die $!;
1103 recorderror "$@" or die;
1110 $distrodir = argval();
1111 $keyrings = argval();
1113 foreach my $dk (keys %indistrodir) {
1114 ${ $indistrodir{$dk} } = "$distrodir/$dk";
1117 while (@ARGV && $ARGV[0] =~ m/^--([-0-9a-z]+)=/ && $indistrodir{$1}) {
1118 ${ $indistrodir{$1} } = $'; #';
1122 $ENV{"DGIT_DRS_\U$_"} = ${ $main::{$_} } foreach @hookenvs;
1124 die unless @ARGV==1;
1126 my $mode = shift @ARGV;
1127 die unless $mode =~ m/^--(\w+)$/;
1128 my $fn = ${*::}{"mode_$1"};
1134 while (my $fh = pop @lockfhs) { close $fh; }
1139 if (!chdir "$dgitrepos/_tmp") {
1140 $!==ENOENT or die $!;
1143 foreach my $lf (<*.lock>) {
1145 $tree =~ s/\.lock$//;
1146 next unless acquirermtree($tree, 0);
1147 remove $lf or warn $!;
1152 parseargsdispatch();