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 = $$;
128 sub forkcheck_mainprocess () {
129 # You must have called forkcheck_setup or setup_sigwarn already
130 getppid != $forkcheck_mainprocess;
133 sub setup_sigwarn () {
135 $SIG{__WARN__} = sub {
136 confess $_[0] if forkcheck_mainprocess;
142 open DEBUG, ">/dev/null" or die $!;
146 open DEBUG, ">&STDERR" or die $!;
151 sub enabledebuglevel ($) {
152 my ($newlevel) = @_; # may be undef (eg from env var)
156 return unless $newlevel;
157 $debuglevel = $newlevel;
162 return unless $debuglevel >= $printdebug_when_debuglevel;
163 print DEBUG $debugprefix;
164 print DEBUG @_ or die $!;
167 sub messagequote ($) {
173 s{[\000-\037\177]}{ sprintf "\\x%02x", ord $& }ge;
180 defined or confess 'internal error' foreach @_;
183 if (!length || m{[^-=_./:0-9a-z]}i) {
190 return join ' ', @out;
195 my $intro = shift @_;
196 print $fh $intro," " or die $!;
197 print $fh shellquote @_ or die $!;
198 print $fh "\n" or die $!;
202 my $extraprefix = shift @_;
203 printcmd(\*DEBUG,$debugprefix.$extraprefix,@_)
204 if $debuglevel >= $debugcmd_when_debuglevel;
207 sub dep14_version_mangle ($) {
209 # DEP-14 patch proposed 2016-11-09 "Version Mangling"
211 $v =~ s/\.(?=\.|$|lock$)/.#/g;
215 sub debiantag_old ($$) {
216 my ($v,$distro) = @_;
217 return "$distro/". dep14_version_mangle $v;
220 sub debiantag_new ($$) {
221 my ($v,$distro) = @_;
222 return "archive/$distro/".dep14_version_mangle $v;
225 sub debiantag_maintview ($$) {
226 my ($v,$distro) = @_;
227 return "$distro/".dep14_version_mangle $v;
230 sub debiantags ($$) {
231 my ($version,$distro) = @_;
232 map { $_->($version, $distro) } (\&debiantag_new, \&debiantag_old);
241 sub upstreamversion ($) {
247 sub source_file_leafname ($$$) {
248 my ($package,$vsn,$sfx) = @_;
249 return "${package}_".(stripepoch $vsn).$sfx
252 sub is_orig_file_of_p_v ($$$) {
253 my ($f, $package, $upstreamvsn) = @_;
254 my $base = source_file_leafname $package, $upstreamvsn, '';
255 return 0 unless $f =~ m/^\Q$base\E\.$orig_f_tail_re$/;
259 sub server_branch ($) { return "$branchprefix/$_[0]"; }
260 sub server_ref ($) { return "refs/".server_branch($_[0]); }
262 sub stat_exists ($) {
265 return 0 if $!==&ENOENT;
270 $::us // ($0 =~ m#[^/]*$#, $&);
274 my $s = "error: @_\n";
276 my $prefix = _us().": ";
277 $s =~ s/^/$prefix/gm;
286 my ($dir) = @_; # does not create parents
287 return if mkdir $dir;
288 return if $! == EEXIST;
289 die "mkdir $dir: $!";
294 defined $d or fail "getcwd failed: $!";
298 sub executable_on_path ($) {
300 return 1 if $program =~ m{/};
301 my @path = split /:/, ($ENV{PATH} // "/usr/local/bin:/bin:/usr/bin");
302 foreach my $pe (@path) {
303 my $here = "$pe/$program";
304 return $here if stat_exists $here && -x _;
309 our @signames = split / /, $Config{sig_name};
311 sub waitstatusmsg () {
313 return "terminated, reporting successful completion";
314 } elsif (!($? & 255)) {
315 return "failed with error exit status ".WEXITSTATUS($?);
316 } elsif (WIFSIGNALED($?)) {
317 my $signum=WTERMSIG($?);
318 return "died due to fatal signal ".
319 ($signames[$signum] // "number $signum").
320 ($? & 128 ? " (core dumped)" : ""); # POSIX(3pm) has no WCOREDUMP
322 return "failed with unknown wait status ".$?;
326 sub failedcmd_report_cmd {
327 my $intro = shift @_;
328 $intro //= "failed command";
329 { local ($!); printcmd \*STDERR, _us().": $intro:", @_ or die $!; };
332 sub failedcmd_waitstatus {
334 return "failed to fork/exec: $!";
336 return "subprocess ".waitstatusmsg();
338 return "subprocess produced invalid output";
343 # Expects $!,$? as set by close - see below.
344 # To use with system(), set $?=-1 first.
346 # Actual behaviour of perl operations:
347 # success $!==0 $?==0 close of piped open
348 # program failed $!==0 $? >0 close of piped open
349 # syscall failure $! >0 $?=-1 close of piped open
350 # failure $! >0 unchanged close of something else
351 # success trashed $?==0 system
352 # program failed trashed $? >0 system
353 # syscall failure $! >0 unchanged system
354 failedcmd_report_cmd undef, @_;
355 fail failedcmd_waitstatus();
361 failedcmd @_ if system @_;
365 my ($first_shell, @cmd) = @_;
366 return qw(sh -ec), $first_shell.'; exec "$@"', 'x', @cmd;
369 sub cmdoutput_errok {
370 confess Dumper(\@_)." ?" if grep { !defined } @_;
371 local $printdebug_when_debuglevel = $debugcmd_when_debuglevel;
373 open P, "-|", @_ or die "$_[0] $!";
376 { local $/ = undef; $d = <P>; }
378 if (!close P) { printdebug "=>!$?\n"; return undef; }
380 if ($debuglevel > 0) {
383 my $more = (length $' ? '...' : ''); #');
384 $dd =~ s{[^\n -~]|\\}{ sprintf "\\x%02x", ord $& }ge;
385 printdebug "=> \`$dd'",$more,"\n";
391 my $d = cmdoutput_errok @_;
392 defined $d or failedcmd @_;
396 sub link_ltarget ($$) {
398 lstat $old or return undef;
400 $old = cmdoutput qw(realpath --), $old;
402 my $r = link $old, $new;
403 $r = symlink $old, $new if !$r && $!==EXDEV;
404 $r or die "(sym)link $old $new: $!";
409 my $h = Digest::SHA->new(256);
411 return $h->hexdigest();
414 sub git_rev_parse ($) {
415 return cmdoutput qw(git rev-parse), "$_[0]~0";
418 sub git_cat_file ($;$) {
419 my ($objname, $etype) = @_;
420 # => ($type, $data) or ('missing', undef)
421 # in scalar context, just the data
422 # if $etype defined, dies unless type is $etype or in @$etype
423 our ($gcf_pid, $gcf_i, $gcf_o);
424 local $printdebug_when_debuglevel = $debugcmd_when_debuglevel;
426 my ($gtype, $data) = @_;
428 $etype = [$etype] unless ref $etype;
429 confess "$objname expected @$etype but is $gtype"
430 unless grep { $gtype eq $_ } @$etype;
432 return ($gtype, $data);
435 my @cmd = qw(git cat-file --batch);
436 debugcmd "GCF|", @cmd;
437 $gcf_pid = open2 $gcf_o, $gcf_i, @cmd or die $!;
439 printdebug "GCF>| ", $objname, "\n";
440 print $gcf_i $objname, "\n" or die $!;
442 printdebug "GCF<| ", $x;
443 if ($x =~ m/ (missing)$/) { return $chk->($1, undef); }
444 my ($type, $size) = $x =~ m/^.* (\w+) (\d+)\n/ or die "$objname ?";
446 (read $gcf_o, $data, $size) == $size or die "$objname $!";
448 $x eq "\n" or die "$objname ($_) $!";
449 return $chk->($type, $data);
452 sub git_get_symref (;$) {
453 my ($symref) = @_; $symref //= 'HEAD';
454 # => undef if not a symref, otherwise refs/...
455 my @cmd = (qw(git symbolic-ref -q HEAD));
456 my $branch = cmdoutput_errok @cmd;
457 if (!defined $branch) {
458 $?==256 or failedcmd @cmd;
465 sub git_for_each_ref ($$;$) {
466 my ($pattern,$func,$gitdir) = @_;
467 # calls $func->($objid,$objtype,$fullrefname,$reftail);
468 # $reftail is RHS of ref after refs/[^/]+/
469 # breaks if $pattern matches any ref `refs/blah' where blah has no `/'
470 # $pattern may be an array ref to mean multiple patterns
471 $pattern = [ $pattern ] unless ref $pattern;
472 my @cmd = (qw(git for-each-ref), @$pattern);
473 if (defined $gitdir) {
474 @cmd = ('sh','-ec','cd "$1"; shift; exec "$@"','x', $gitdir, @cmd);
476 open GFER, "-|", @cmd or die $!;
480 printdebug "|> ", $_, "\n";
481 m#^(\w+)\s+(\w+)\s+(refs/[^/]+/(\S+))$# or die "$_ ?";
482 $func->($1,$2,$3,$4);
484 $!=0; $?=0; close GFER or die "$pattern $? $!";
487 sub git_get_ref ($) {
488 # => '' if no such ref
491 s{^refs/}{[r]efs/} or die "$refname $_ ?";
492 return cmdoutput qw(git for-each-ref --format=%(objectname)), $_;
495 sub git_for_each_tag_referring ($$) {
496 my ($objreferring, $func) = @_;
497 # calls $func->($tagobjid,$refobjid,$fullrefname,$tagname);
498 printdebug "git_for_each_tag_referring ",
499 ($objreferring // 'UNDEF'),"\n";
500 git_for_each_ref('refs/tags', sub {
501 my ($tagobjid,$objtype,$fullrefname,$tagname) = @_;
502 return unless $objtype eq 'tag';
503 my $refobjid = git_rev_parse $tagobjid;
505 !defined $objreferring # caller wants them all
506 or $tagobjid eq $objreferring
507 or $refobjid eq $objreferring;
508 $func->($tagobjid,$refobjid,$fullrefname,$tagname);
512 sub git_check_unmodified () {
513 foreach my $cached (qw(0 1)) {
514 my @cmd = qw(git diff --quiet);
515 push @cmd, qw(--cached) if $cached;
518 $!=0; $?=-1; system @cmd;
523 ? "git index contains changes (does not match HEAD)"
524 : "working tree is dirty (does not match HEAD)";
531 sub is_fast_fwd ($$) {
532 my ($ancestor,$child) = @_;
533 my @cmd = (qw(git merge-base), $ancestor, $child);
534 my $mb = cmdoutput_errok @cmd;
536 return git_rev_parse($mb) eq git_rev_parse($ancestor);
538 $?==256 or failedcmd @cmd;
543 sub git_reflog_action_msg ($) {
545 my $rla = $ENV{GIT_REFLOG_ACTION};
546 $msg = "$rla: $msg" if length $rla;
550 sub git_update_ref_cmd {
551 # returns qw(git update-ref), qw(-m), @_
552 # except that message may be modified to honour GIT_REFLOG_ACTION
554 $msg = git_reflog_action_msg $msg;
555 return qw(git update-ref -m), $msg, @_;
560 printdebug "CD $newdir\n";
561 chdir $newdir or confess "chdir: $newdir: $!";
564 sub git_slurp_config_src ($) {
566 # returns $r such that $r->{KEY}[] = VALUE
567 my @cmd = (qw(git config -z --get-regexp), "--$src", qw(.*));
570 local ($debuglevel) = $debuglevel-2;
574 open GITS, "-|", @cmd or die $!;
577 printdebug "=> ", (messagequote $_), "\n";
579 push @{ $r->{$`} }, $'; #';
583 or ($!==0 && $?==256)
588 sub gdr_ffq_prev_branchinfo ($) {
590 # => ('status', "message", [$symref, $ffq_prev, $gdrlast])
592 # branch message is undef
593 # weird-symref } no $symref,
594 # notbranch } no $ffq_prev
595 return ('detached', 'detached HEAD') unless defined $symref;
596 return ('weird-symref', 'HEAD symref is not to refs/')
597 unless $symref =~ m{^refs/};
598 my $ffq_prev = "refs/$ffq_refprefix/$'";
599 my $gdrlast = "refs/$gdrlast_refprefix/$'";
600 printdebug "ffq_prev_branchinfo branch current $symref\n";
601 return ('branch', undef, $symref, $ffq_prev, $gdrlast);
604 sub parsecontrolfh ($$;$) {
605 my ($fh, $desc, $allowsigned) = @_;
606 our $dpkgcontrolhash_noissigned;
609 my %opts = ('name' => $desc);
610 $opts{allow_pgp}= $allowsigned || !$dpkgcontrolhash_noissigned;
611 $c = Dpkg::Control::Hash->new(%opts);
612 $c->parse($fh,$desc) or die "parsing of $desc failed";
613 last if $allowsigned;
614 last if $dpkgcontrolhash_noissigned;
615 my $issigned= $c->get_option('is_pgp_signed');
616 if (!defined $issigned) {
617 $dpkgcontrolhash_noissigned= 1;
618 seek $fh, 0,0 or die "seek $desc: $!";
619 } elsif ($issigned) {
620 fail "control file $desc is (already) PGP-signed. ".
621 " Note that dgit push needs to modify the .dsc and then".
622 " do the signature itself";
631 my ($file, $desc, $allowsigned) = @_;
632 my $fh = new IO::Handle;
633 open $fh, '<', $file or die "$file: $!";
634 my $c = parsecontrolfh($fh,$desc,$allowsigned);
635 $fh->error and die $!;
641 my $c = Dpkg::Control::Hash->new(name => 'parsed changelog');
642 my $p = new IO::Handle;
643 my @cmd = (qw(dpkg-parsechangelog), @_);
644 open $p, '-|', @cmd or die $!;
646 $?=0; $!=0; close $p or failedcmd @cmd;
651 my ($dctrl,$field) = @_;
652 my $v = $dctrl->{$field};
653 return $v if defined $v;
654 fail "missing field $field in ".$dctrl->get_option('name');
657 sub parsechangelog_loop ($$$) {
658 my ($clogcmd, $descbase, $fn) = @_;
659 # @$clogcmd is qw(dpkg-parsechangelog ...some...options...)
660 # calls $fn->($thisstanza, $desc);
661 debugcmd "|",@$clogcmd;
662 open CLOGS, "-|", @$clogcmd or die $!;
664 my $stanzatext = do { local $/=""; <CLOGS>; };
665 printdebug "clogp stanza ".Dumper($stanzatext) if $debuglevel>1;
666 last if !defined $stanzatext;
668 my $desc = "$descbase, entry no.$.";
669 open my $stanzafh, "<", \$stanzatext or die;
670 my $thisstanza = parsecontrolfh $stanzafh, $desc, 1;
672 $fn->($thisstanza, $desc);
674 die $! if CLOGS->error;
675 close CLOGS or $?==SIGPIPE or failedcmd @$clogcmd;
678 # ========== playground handling ==========
682 # $maindir user's git working tree
683 # playground area in .git/ where we can make files, unpack, etc. etc.
684 # playtree git working tree sharing object store with the user's
685 # inside playground, or identical to it
689 # $local_git_cfg hash of arrays of values: git config from $maindir
691 # expected calling pattern
696 # must be run in directory containing .git
697 # assigns to $maindir if not already set
698 # also calls git_slurp_config_src to record git config
699 # in $local_git_cfg, unless it's already set
701 # fresh_playground SUBDIR_PATH_COMPONENTS
702 # e.g fresh_playground 'dgit/unpack' ('.git/' is implied)
703 # default SUBDIR_PATH_COMPONENTS is playground_subdir
704 # calls record_maindir
705 # sets up a new playground (destroying any old one)
706 # returns playground pathname
707 # caller may call multiple times with different subdir paths
708 # createing different playgrounds
710 # ensure_a_playground SUBDIR_PATH_COMPONENTS
711 # like fresh_playground except:
712 # merely ensures the directory exists; does not delete an existing one
716 # changedir playground
719 # playtree_setup $local_git_cfg
720 # # ^ call in some (perhaps trivial) subdir of playground
724 # ----- maindir -----
726 # these three all go together
729 our $maindir_gitcommon;
733 sub record_maindir () {
734 if (!defined $maindir) {
735 $maindir = must_getcwd();
736 if (!stat "$maindir/.git") {
737 fail "cannot stat $maindir/.git: $!";
740 # we fall back to this in case we have a pre-worktree
741 # git, which may not know git rev-parse --git-common-dir
742 $maindir_gitdir = "$maindir/.git";
743 $maindir_gitcommon = "$maindir/.git";
745 $maindir_gitdir = cmdoutput qw(git rev-parse --git-dir);
746 $maindir_gitcommon = cmdoutput qw(git rev-parse --git-common-dir);
749 $local_git_cfg //= git_slurp_config_src 'local';
752 # ----- playgrounds -----
754 sub ensure_a_playground_parent ($) {
757 $spc = "$maindir_gitdir/$spc";
758 my $parent = dirname $spc;
759 mkdir $parent or $!==EEXIST
760 or fail "failed to mkdir playground parent $parent: $!";
764 sub ensure_a_playground ($) {
766 $spc = ensure_a_playground_parent $spc;
767 mkdir $spc or $!==EEXIST or fail "failed to mkdir a playground $spc: $!";
771 sub fresh_playground ($) {
773 $spc = ensure_a_playground_parent $spc;
775 mkdir $spc or fail "failed to mkdir the playground $spc: $!";
779 # ----- playtrees -----
781 sub playtree_setup (;$) {
782 my ($t_local_git_cfg) = @_;
783 $t_local_git_cfg //= $local_git_cfg;
784 # for use in the playtree
785 # $maindir must be set, eg by calling record_maindir or fresh_playground
786 runcmd qw(git init -q);
787 runcmd qw(git config gc.auto 0);
788 foreach my $copy (qw(user.email user.name user.useConfigOnly
789 core.sharedRepository
790 core.compression core.looseCompression
791 core.bigFileThreshold core.fsyncObjectFiles)) {
792 my $v = $t_local_git_cfg->{$copy};
794 runcmd qw(git config), $copy, $_ foreach @$v;
796 # this is confusing: we have
797 # . playtree, not a worktree, has .git/, our cwd
798 # $maindir might be a worktree so
799 # $maindir_gitdir contains our main working "dgit", HEAD, etc.
800 # $maindir_gitcommon the shared stuff, including .objects
801 rmtree('.git/objects');
802 symlink "$maindir_gitcommon/objects",'.git/objects' or die $!;
803 ensuredir '.git/info';
804 open GA, "> .git/info/attributes" or die $!;
805 print GA "* $negate_harmful_gitattrs\n" or die $!;