3 # Debian::Dgit: functions common to dgit and its helpers and servers
5 # Copyright (C) 2015-2016 Ian Jackson
7 # This program is free software; you can redistribute it and/or modify
8 # it under the terms of the GNU General Public License as published by
9 # the Free Software Foundation; either version 3 of the License, or
10 # (at your option) any later version.
12 # This program is distributed in the hope that it will be useful,
13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 # GNU General Public License for more details.
17 # You should have received a copy of the GNU General Public License
18 # along with this program. If not, see <http://www.gnu.org/licenses/>.
34 use Dpkg::Control::Hash;
38 our ($VERSION, @ISA, @EXPORT, @EXPORT_OK, %EXPORT_TAGS);
42 @EXPORT = qw(setup_sigwarn forkcheck_setup forkcheck_mainprocess
44 debiantags debiantag_old debiantag_new
47 stripepoch source_file_leafname is_orig_file_of_p_v
48 server_branch server_ref
49 stat_exists link_ltarget
51 fail failmsg ensuredir must_getcwd executable_on_path
52 waitstatusmsg failedcmd_waitstatus
53 failedcmd_report_cmd failedcmd
54 runcmd shell_cmd cmdoutput cmdoutput_errok
55 git_rev_parse git_cat_file
56 git_get_ref git_get_symref git_for_each_ref
57 git_for_each_tag_referring is_fast_fwd
59 git_reflog_action_msg git_update_ref_cmd
60 $package_re $component_re $deliberately_re
61 $distro_re $versiontag_re $series_filename_re
62 $orig_f_comp_re $orig_f_sig_re $orig_f_tail_re
63 $extra_orig_namepart_re
66 $ffq_refprefix $gdrlast_refprefix
67 initdebug enabledebug enabledebuglevel
69 $printdebug_when_debuglevel $debugcmd_when_debuglevel
70 $debugprefix *debuglevel *DEBUG
71 shellquote printcmd messagequote
72 $negate_harmful_gitattrs
73 changedir git_slurp_config_src
74 gdr_ffq_prev_branchinfo
75 parsecontrolfh parsecontrol parsechangelog
76 getfield parsechangelog_loop
78 # implicitly uses $main::us
79 %EXPORT_TAGS = ( policyflags => [qw(NOFFCHECK FRESHREPO NOCOMMITCHECK)],
80 playground => [qw(record_maindir $maindir $local_git_cfg
81 $maindir_gitdir $maindir_gitcommon
83 ensure_a_playground)]);
84 @EXPORT_OK = ( @{ $EXPORT_TAGS{policyflags} },
85 @{ $EXPORT_TAGS{playground} } );
90 our $package_re = '[0-9a-z][-+.0-9a-z]*';
91 our $component_re = '[0-9a-zA-Z][-+.0-9a-zA-Z]*';
92 our $deliberately_re = "(?:TEST-)?$package_re";
93 our $distro_re = $component_re;
94 our $versiontag_re = qr{[-+.\%_0-9a-zA-Z/]+};
95 our $branchprefix = 'dgit';
96 our $series_filename_re = qr{(?:^|\.)series(?!\n)$}s;
97 our $extra_orig_namepart_re = qr{[-0-9a-z]+};
98 our $orig_f_comp_re = qr{orig(?:-$extra_orig_namepart_re)?};
99 our $orig_f_sig_re = '\\.(?:asc|gpg|pgp)';
100 our $orig_f_tail_re = "$orig_f_comp_re\\.tar(?:\\.\\w+)?(?:$orig_f_sig_re)?";
101 our $git_null_obj = '0' x 40;
102 our $ffq_refprefix = 'ffq-prev';
103 our $gdrlast_refprefix = 'debrebase-last';
104 our $printdebug_when_debuglevel = 1;
105 our $debugcmd_when_debuglevel = 1;
107 # policy hook exit status bits
108 # see dgit-repos-server head comment for documentation
109 # 1 is reserved in case something fails with `exit 1' and to spot
110 # dynamic loader, runtime, etc., failures, which report 127 or 255
111 sub NOFFCHECK () { return 0x2; }
112 sub FRESHREPO () { return 0x4; }
113 sub NOCOMMITCHECK () { return 0x8; }
118 our $negate_harmful_gitattrs =
119 "-text -eol -crlf -ident -filter -working-tree-encoding";
120 # ^ when updating this, alter the regexp in dgit:is_gitattrs_setup
122 our $forkcheck_mainprocess;
124 sub forkcheck_setup () {
125 $forkcheck_mainprocess = $$;
128 sub forkcheck_mainprocess () {
129 # You must have called forkcheck_setup or setup_sigwarn already
130 getppid != $forkcheck_mainprocess;
133 sub setup_sigwarn () {
135 $SIG{__WARN__} = sub {
136 confess $_[0] if forkcheck_mainprocess;
142 open DEBUG, ">/dev/null" or die $!;
146 open DEBUG, ">&STDERR" or die $!;
151 sub enabledebuglevel ($) {
152 my ($newlevel) = @_; # may be undef (eg from env var)
156 return unless $newlevel;
157 $debuglevel = $newlevel;
162 return unless $debuglevel >= $printdebug_when_debuglevel;
163 print DEBUG $debugprefix;
164 pop @_ while @_ and !length $_[-1];
166 print DEBUG @_ or die $!;
169 sub messagequote ($) {
175 s{[\000-\037\177]}{ sprintf "\\x%02x", ord $& }ge;
182 defined or confess 'internal error' foreach @_;
185 if (!length || m{[^-=_./:0-9a-z]}i) {
192 return join ' ', @out;
197 my $intro = shift @_;
198 print $fh $intro," " or die $!;
199 print $fh shellquote @_ or die $!;
200 print $fh "\n" or die $!;
204 my $extraprefix = shift @_;
205 printcmd(\*DEBUG,$debugprefix.$extraprefix,@_)
206 if $debuglevel >= $debugcmd_when_debuglevel;
209 sub dep14_version_mangle ($) {
211 # DEP-14 patch proposed 2016-11-09 "Version Mangling"
213 $v =~ s/\.(?=\.|$|lock$)/.#/g;
217 sub debiantag_old ($$) {
218 my ($v,$distro) = @_;
219 return "$distro/". dep14_version_mangle $v;
222 sub debiantag_new ($$) {
223 my ($v,$distro) = @_;
224 return "archive/$distro/".dep14_version_mangle $v;
227 sub debiantag_maintview ($$) {
228 my ($v,$distro) = @_;
229 return "$distro/".dep14_version_mangle $v;
232 sub debiantags ($$) {
233 my ($version,$distro) = @_;
234 map { $_->($version, $distro) } (\&debiantag_new, \&debiantag_old);
243 sub upstreamversion ($) {
249 sub source_file_leafname ($$$) {
250 my ($package,$vsn,$sfx) = @_;
251 return "${package}_".(stripepoch $vsn).$sfx
254 sub is_orig_file_of_p_v ($$$) {
255 my ($f, $package, $upstreamvsn) = @_;
256 my $base = source_file_leafname $package, $upstreamvsn, '';
257 return 0 unless $f =~ m/^\Q$base\E\.$orig_f_tail_re$/;
261 sub server_branch ($) { return "$branchprefix/$_[0]"; }
262 sub server_ref ($) { return "refs/".server_branch($_[0]); }
264 sub stat_exists ($) {
267 return 0 if $!==&ENOENT;
272 $::us // ($0 =~ m#[^/]*$#, $&);
276 my $s = "error: @_\n";
278 my $prefix = _us().": ";
279 $s =~ s/^/$prefix/gm;
288 my ($dir) = @_; # does not create parents
289 return if mkdir $dir;
290 return if $! == EEXIST;
291 die "mkdir $dir: $!";
296 defined $d or fail "getcwd failed: $!";
300 sub executable_on_path ($) {
302 return 1 if $program =~ m{/};
303 my @path = split /:/, ($ENV{PATH} // "/usr/local/bin:/bin:/usr/bin");
304 foreach my $pe (@path) {
305 my $here = "$pe/$program";
306 return $here if stat_exists $here && -x _;
311 our @signames = split / /, $Config{sig_name};
313 sub waitstatusmsg () {
315 return "terminated, reporting successful completion";
316 } elsif (!($? & 255)) {
317 return "failed with error exit status ".WEXITSTATUS($?);
318 } elsif (WIFSIGNALED($?)) {
319 my $signum=WTERMSIG($?);
320 return "died due to fatal signal ".
321 ($signames[$signum] // "number $signum").
322 ($? & 128 ? " (core dumped)" : ""); # POSIX(3pm) has no WCOREDUMP
324 return "failed with unknown wait status ".$?;
328 sub failedcmd_report_cmd {
329 my $intro = shift @_;
330 $intro //= "failed command";
331 { local ($!); printcmd \*STDERR, _us().": $intro:", @_ or die $!; };
334 sub failedcmd_waitstatus {
336 return "failed to fork/exec: $!";
338 return "subprocess ".waitstatusmsg();
340 return "subprocess produced invalid output";
345 # Expects $!,$? as set by close - see below.
346 # To use with system(), set $?=-1 first.
348 # Actual behaviour of perl operations:
349 # success $!==0 $?==0 close of piped open
350 # program failed $!==0 $? >0 close of piped open
351 # syscall failure $! >0 $?=-1 close of piped open
352 # failure $! >0 unchanged close of something else
353 # success trashed $?==0 system
354 # program failed trashed $? >0 system
355 # syscall failure $! >0 unchanged system
356 failedcmd_report_cmd undef, @_;
357 fail failedcmd_waitstatus();
363 failedcmd @_ if system @_;
367 my ($first_shell, @cmd) = @_;
368 return qw(sh -ec), $first_shell.'; exec "$@"', 'x', @cmd;
371 sub cmdoutput_errok {
372 confess Dumper(\@_)." ?" if grep { !defined } @_;
373 local $printdebug_when_debuglevel = $debugcmd_when_debuglevel;
375 open P, "-|", @_ or die "$_[0] $!";
378 { local $/ = undef; $d = <P>; }
380 if (!close P) { printdebug "=>!$?\n"; return undef; }
382 if ($debuglevel > 0) {
385 my $more = (length $' ? '...' : ''); #');
386 $dd =~ s{[^\n -~]|\\}{ sprintf "\\x%02x", ord $& }ge;
387 printdebug "=> \`$dd'",$more,"\n";
393 my $d = cmdoutput_errok @_;
394 defined $d or failedcmd @_;
398 sub link_ltarget ($$) {
400 lstat $old or return undef;
402 $old = cmdoutput qw(realpath --), $old;
404 my $r = link $old, $new;
405 $r = symlink $old, $new if !$r && $!==EXDEV;
406 $r or die "(sym)link $old $new: $!";
411 my $h = Digest::SHA->new(256);
413 return $h->hexdigest();
416 sub git_rev_parse ($) {
417 return cmdoutput qw(git rev-parse), "$_[0]~0";
420 sub git_cat_file ($;$) {
421 my ($objname, $etype) = @_;
422 # => ($type, $data) or ('missing', undef)
423 # in scalar context, just the data
424 # if $etype defined, dies unless type is $etype or in @$etype
425 our ($gcf_pid, $gcf_i, $gcf_o);
426 local $printdebug_when_debuglevel = $debugcmd_when_debuglevel;
428 my ($gtype, $data) = @_;
430 $etype = [$etype] unless ref $etype;
431 confess "$objname expected @$etype but is $gtype"
432 unless grep { $gtype eq $_ } @$etype;
434 return ($gtype, $data);
437 my @cmd = qw(git cat-file --batch);
438 debugcmd "GCF|", @cmd;
439 $gcf_pid = open2 $gcf_o, $gcf_i, @cmd or die $!;
441 printdebug "GCF>| ", $objname, "\n";
442 print $gcf_i $objname, "\n" or die $!;
444 printdebug "GCF<| ", $x;
445 if ($x =~ m/ (missing)$/) { return $chk->($1, undef); }
446 my ($type, $size) = $x =~ m/^.* (\w+) (\d+)\n/ or die "$objname ?";
448 (read $gcf_o, $data, $size) == $size or die "$objname $!";
450 $x eq "\n" or die "$objname ($_) $!";
451 return $chk->($type, $data);
454 sub git_get_symref (;$) {
455 my ($symref) = @_; $symref //= 'HEAD';
456 # => undef if not a symref, otherwise refs/...
457 my @cmd = (qw(git symbolic-ref -q HEAD));
458 my $branch = cmdoutput_errok @cmd;
459 if (!defined $branch) {
460 $?==256 or failedcmd @cmd;
467 sub git_for_each_ref ($$;$) {
468 my ($pattern,$func,$gitdir) = @_;
469 # calls $func->($objid,$objtype,$fullrefname,$reftail);
470 # $reftail is RHS of ref after refs/[^/]+/
471 # breaks if $pattern matches any ref `refs/blah' where blah has no `/'
472 # $pattern may be an array ref to mean multiple patterns
473 $pattern = [ $pattern ] unless ref $pattern;
474 my @cmd = (qw(git for-each-ref), @$pattern);
475 if (defined $gitdir) {
476 @cmd = ('sh','-ec','cd "$1"; shift; exec "$@"','x', $gitdir, @cmd);
478 open GFER, "-|", @cmd or die $!;
482 printdebug "|> ", $_, "\n";
483 m#^(\w+)\s+(\w+)\s+(refs/[^/]+/(\S+))$# or die "$_ ?";
484 $func->($1,$2,$3,$4);
486 $!=0; $?=0; close GFER or die "$pattern $? $!";
489 sub git_get_ref ($) {
490 # => '' if no such ref
493 s{^refs/}{[r]efs/} or die "$refname $_ ?";
494 return cmdoutput qw(git for-each-ref --format=%(objectname)), $_;
497 sub git_for_each_tag_referring ($$) {
498 my ($objreferring, $func) = @_;
499 # calls $func->($tagobjid,$refobjid,$fullrefname,$tagname);
500 printdebug "git_for_each_tag_referring ",
501 ($objreferring // 'UNDEF'),"\n";
502 git_for_each_ref('refs/tags', sub {
503 my ($tagobjid,$objtype,$fullrefname,$tagname) = @_;
504 return unless $objtype eq 'tag';
505 my $refobjid = git_rev_parse $tagobjid;
507 !defined $objreferring # caller wants them all
508 or $tagobjid eq $objreferring
509 or $refobjid eq $objreferring;
510 $func->($tagobjid,$refobjid,$fullrefname,$tagname);
514 sub git_check_unmodified () {
515 foreach my $cached (qw(0 1)) {
516 my @cmd = qw(git diff --quiet);
517 push @cmd, qw(--cached) if $cached;
520 $!=0; $?=-1; system @cmd;
525 ? "git index contains changes (does not match HEAD)"
526 : "working tree is dirty (does not match HEAD)";
533 sub is_fast_fwd ($$) {
534 my ($ancestor,$child) = @_;
535 my @cmd = (qw(git merge-base), $ancestor, $child);
536 my $mb = cmdoutput_errok @cmd;
538 return git_rev_parse($mb) eq git_rev_parse($ancestor);
540 $?==256 or failedcmd @cmd;
545 sub git_reflog_action_msg ($) {
547 my $rla = $ENV{GIT_REFLOG_ACTION};
548 $msg = "$rla: $msg" if length $rla;
552 sub git_update_ref_cmd {
553 # returns qw(git update-ref), qw(-m), @_
554 # except that message may be modified to honour GIT_REFLOG_ACTION
556 $msg = git_reflog_action_msg $msg;
557 return qw(git update-ref -m), $msg, @_;
562 printdebug "CD $newdir\n";
563 chdir $newdir or confess "chdir: $newdir: $!";
566 sub git_slurp_config_src ($) {
568 # returns $r such that $r->{KEY}[] = VALUE
569 my @cmd = (qw(git config -z --get-regexp), "--$src", qw(.*));
572 local ($debuglevel) = $debuglevel-2;
576 open GITS, "-|", @cmd or die $!;
579 printdebug "=> ", (messagequote $_), "\n";
581 push @{ $r->{$`} }, $'; #';
585 or ($!==0 && $?==256)
590 sub gdr_ffq_prev_branchinfo ($) {
592 # => ('status', "message", [$symref, $ffq_prev, $gdrlast])
594 # branch message is undef
595 # weird-symref } no $symref,
596 # notbranch } no $ffq_prev
597 return ('detached', 'detached HEAD') unless defined $symref;
598 return ('weird-symref', 'HEAD symref is not to refs/')
599 unless $symref =~ m{^refs/};
600 my $ffq_prev = "refs/$ffq_refprefix/$'";
601 my $gdrlast = "refs/$gdrlast_refprefix/$'";
602 printdebug "ffq_prev_branchinfo branch current $symref\n";
603 return ('branch', undef, $symref, $ffq_prev, $gdrlast);
606 sub parsecontrolfh ($$;$) {
607 my ($fh, $desc, $allowsigned) = @_;
608 our $dpkgcontrolhash_noissigned;
611 my %opts = ('name' => $desc);
612 $opts{allow_pgp}= $allowsigned || !$dpkgcontrolhash_noissigned;
613 $c = Dpkg::Control::Hash->new(%opts);
614 $c->parse($fh,$desc) or die "parsing of $desc failed";
615 last if $allowsigned;
616 last if $dpkgcontrolhash_noissigned;
617 my $issigned= $c->get_option('is_pgp_signed');
618 if (!defined $issigned) {
619 $dpkgcontrolhash_noissigned= 1;
620 seek $fh, 0,0 or die "seek $desc: $!";
621 } elsif ($issigned) {
622 fail "control file $desc is (already) PGP-signed. ".
623 " Note that dgit push needs to modify the .dsc and then".
624 " do the signature itself";
633 my ($file, $desc, $allowsigned) = @_;
634 my $fh = new IO::Handle;
635 open $fh, '<', $file or die "$file: $!";
636 my $c = parsecontrolfh($fh,$desc,$allowsigned);
637 $fh->error and die $!;
643 my $c = Dpkg::Control::Hash->new(name => 'parsed changelog');
644 my $p = new IO::Handle;
645 my @cmd = (qw(dpkg-parsechangelog), @_);
646 open $p, '-|', @cmd or die $!;
648 $?=0; $!=0; close $p or failedcmd @cmd;
653 my ($dctrl,$field) = @_;
654 my $v = $dctrl->{$field};
655 return $v if defined $v;
656 fail "missing field $field in ".$dctrl->get_option('name');
659 sub parsechangelog_loop ($$$) {
660 my ($clogcmd, $descbase, $fn) = @_;
661 # @$clogcmd is qw(dpkg-parsechangelog ...some...options...)
662 # calls $fn->($thisstanza, $desc);
663 debugcmd "|",@$clogcmd;
664 open CLOGS, "-|", @$clogcmd or die $!;
666 my $stanzatext = do { local $/=""; <CLOGS>; };
667 printdebug "clogp stanza ".Dumper($stanzatext) if $debuglevel>1;
668 last if !defined $stanzatext;
670 my $desc = "$descbase, entry no.$.";
671 open my $stanzafh, "<", \$stanzatext or die;
672 my $thisstanza = parsecontrolfh $stanzafh, $desc, 1;
674 $fn->($thisstanza, $desc);
676 die $! if CLOGS->error;
677 close CLOGS or $?==SIGPIPE or failedcmd @$clogcmd;
680 # ========== playground handling ==========
684 # $maindir user's git working tree
685 # playground area in .git/ where we can make files, unpack, etc. etc.
686 # playtree git working tree sharing object store with the user's
687 # inside playground, or identical to it
691 # $local_git_cfg hash of arrays of values: git config from $maindir
693 # expected calling pattern
698 # must be run in directory containing .git
699 # assigns to $maindir if not already set
700 # also calls git_slurp_config_src to record git config
701 # in $local_git_cfg, unless it's already set
703 # fresh_playground SUBDIR_PATH_COMPONENTS
704 # e.g fresh_playground 'dgit/unpack' ('.git/' is implied)
705 # default SUBDIR_PATH_COMPONENTS is playground_subdir
706 # calls record_maindir
707 # sets up a new playground (destroying any old one)
708 # returns playground pathname
709 # caller may call multiple times with different subdir paths
710 # createing different playgrounds
712 # ensure_a_playground SUBDIR_PATH_COMPONENTS
713 # like fresh_playground except:
714 # merely ensures the directory exists; does not delete an existing one
718 # changedir playground
721 # playtree_setup $local_git_cfg
722 # # ^ call in some (perhaps trivial) subdir of playground
726 # ----- maindir -----
728 # these three all go together
731 our $maindir_gitcommon;
735 sub record_maindir () {
736 if (!defined $maindir) {
737 $maindir = must_getcwd();
738 if (!stat "$maindir/.git") {
739 fail "cannot stat $maindir/.git: $!";
742 # we fall back to this in case we have a pre-worktree
743 # git, which may not know git rev-parse --git-common-dir
744 $maindir_gitdir = "$maindir/.git";
745 $maindir_gitcommon = "$maindir/.git";
747 $maindir_gitdir = cmdoutput qw(git rev-parse --git-dir);
748 $maindir_gitcommon = cmdoutput qw(git rev-parse --git-common-dir);
751 $local_git_cfg //= git_slurp_config_src 'local';
754 # ----- playgrounds -----
756 sub ensure_a_playground_parent ($) {
759 $spc = "$maindir_gitdir/$spc";
760 my $parent = dirname $spc;
761 mkdir $parent or $!==EEXIST
762 or fail "failed to mkdir playground parent $parent: $!";
766 sub ensure_a_playground ($) {
768 $spc = ensure_a_playground_parent $spc;
769 mkdir $spc or $!==EEXIST or fail "failed to mkdir a playground $spc: $!";
773 sub fresh_playground ($) {
775 $spc = ensure_a_playground_parent $spc;
777 mkdir $spc or fail "failed to mkdir the playground $spc: $!";
781 # ----- playtrees -----
783 sub playtree_setup (;$) {
784 my ($t_local_git_cfg) = @_;
785 $t_local_git_cfg //= $local_git_cfg;
786 # for use in the playtree
787 # $maindir must be set, eg by calling record_maindir or fresh_playground
788 runcmd qw(git init -q);
789 runcmd qw(git config gc.auto 0);
790 foreach my $copy (qw(user.email user.name user.useConfigOnly
791 core.sharedRepository
792 core.compression core.looseCompression
793 core.bigFileThreshold core.fsyncObjectFiles)) {
794 my $v = $t_local_git_cfg->{$copy};
796 runcmd qw(git config), $copy, $_ foreach @$v;
798 # this is confusing: we have
799 # . playtree, not a worktree, has .git/, our cwd
800 # $maindir might be a worktree so
801 # $maindir_gitdir contains our main working "dgit", HEAD, etc.
802 # $maindir_gitcommon the shared stuff, including .objects
803 rmtree('.git/objects');
804 symlink "$maindir_gitcommon/objects",'.git/objects' or die $!;
805 ensuredir '.git/info';
806 open GA, "> .git/info/attributes" or die $!;
807 print GA "* $negate_harmful_gitattrs\n" or die $!;