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/>.
35 our ($VERSION, @ISA, @EXPORT, @EXPORT_OK, %EXPORT_TAGS);
39 @EXPORT = qw(setup_sigwarn forkcheck_setup forkcheck_mainprocess
41 debiantags debiantag_old debiantag_new
42 server_branch server_ref
43 stat_exists link_ltarget
45 fail ensuredir executable_on_path
46 waitstatusmsg failedcmd_waitstatus
47 failedcmd_report_cmd failedcmd
48 runcmd cmdoutput cmdoutput_errok
49 git_rev_parse git_cat_file
50 git_get_ref git_for_each_ref
51 git_for_each_tag_referring is_fast_fwd
52 $package_re $component_re $deliberately_re
53 $distro_re $versiontag_re $series_filename_re
55 initdebug enabledebug enabledebuglevel
57 $debugprefix *debuglevel *DEBUG
58 shellquote printcmd messagequote
59 $negate_harmful_gitattrs);
60 # implicitly uses $main::us
61 %EXPORT_TAGS = ( policyflags => [qw(NOFFCHECK FRESHREPO NOCOMMITCHECK)] );
62 @EXPORT_OK = @{ $EXPORT_TAGS{policyflags} };
67 our $package_re = '[0-9a-z][-+.0-9a-z]*';
68 our $component_re = '[0-9a-zA-Z][-+.0-9a-zA-Z]*';
69 our $deliberately_re = "(?:TEST-)?$package_re";
70 our $distro_re = $component_re;
71 our $versiontag_re = qr{[-+.\%_0-9a-zA-Z/]+};
72 our $branchprefix = 'dgit';
73 our $series_filename_re = qr{(?:^|\.)series(?!\n)$}s;
75 # policy hook exit status bits
76 # see dgit-repos-server head comment for documentation
77 # 1 is reserved in case something fails with `exit 1' and to spot
78 # dynamic loader, runtime, etc., failures, which report 127 or 255
79 sub NOFFCHECK () { return 0x2; }
80 sub FRESHREPO () { return 0x4; }
81 sub NOCOMMITCHECK () { return 0x8; }
86 our $negate_harmful_gitattrs = "-text -eol -crlf -ident -filter";
88 our $forkcheck_mainprocess;
90 sub forkcheck_setup () {
91 $forkcheck_mainprocess = $$;
94 sub forkcheck_mainprocess () {
95 # You must have called forkcheck_setup or setup_sigwarn already
96 getppid != $forkcheck_mainprocess;
99 sub setup_sigwarn () {
101 $SIG{__WARN__} = sub {
102 die $_[0] if forkcheck_mainprocess;
108 open DEBUG, ">/dev/null" or die $!;
112 open DEBUG, ">&STDERR" or die $!;
117 sub enabledebuglevel ($) {
118 my ($newlevel) = @_; # may be undef (eg from env var)
122 return unless $newlevel;
123 $debuglevel = $newlevel;
128 print DEBUG $debugprefix, @_ or die $! if $debuglevel>0;
131 sub messagequote ($) {
137 s{[\000-\037\177]}{ sprintf "\\x%02x", ord $& }ge;
144 defined or confess 'internal error' foreach @_;
147 if (!length || m{[^-=_./:0-9a-z]}i) {
154 return join ' ', @out;
159 my $intro = shift @_;
160 print $fh $intro," " or die $!;
161 print $fh shellquote @_ or die $!;
162 print $fh "\n" or die $!;
166 my $extraprefix = shift @_;
167 printcmd(\*DEBUG,$debugprefix.$extraprefix,@_) if $debuglevel>0;
170 sub dep14_version_mangle ($) {
172 # DEP-14 patch proposed 2016-11-09 "Version Mangling"
174 $v =~ s/\.(?=\.|$|lock$)/.#/g;
178 sub debiantag_old ($$) {
179 my ($v,$distro) = @_;
180 return "$distro/". dep14_version_mangle $v;
183 sub debiantag_new ($$) {
184 my ($v,$distro) = @_;
185 return "archive/$distro/".dep14_version_mangle $v;
188 sub debiantags ($$) {
189 my ($version,$distro) = @_;
190 map { $_->($version, $distro) } (\&debiantag_new, \&debiantag_old);
193 sub server_branch ($) { return "$branchprefix/$_[0]"; }
194 sub server_ref ($) { return "refs/".server_branch($_[0]); }
196 sub stat_exists ($) {
199 return 0 if $!==&ENOENT;
204 $::us // ($0 =~ m#[^/]*$#, $&);
210 my $prefix = _us().": ";
211 $s =~ s/^/$prefix/gm;
216 my ($dir) = @_; # does not create parents
217 return if mkdir $dir;
218 return if $! == EEXIST;
219 die "mkdir $dir: $!";
222 sub executable_on_path ($) {
224 return 1 if $program =~ m{/};
225 my @path = split /:/, ($ENV{PATH} // "/usr/local/bin:/bin:/usr/bin");
226 foreach my $pe (@path) {
227 my $here = "$pe/$program";
228 return $here if stat_exists $here && -x _;
233 our @signames = split / /, $Config{sig_name};
235 sub waitstatusmsg () {
237 return "terminated, reporting successful completion";
238 } elsif (!($? & 255)) {
239 return "failed with error exit status ".WEXITSTATUS($?);
240 } elsif (WIFSIGNALED($?)) {
241 my $signum=WTERMSIG($?);
242 return "died due to fatal signal ".
243 ($signames[$signum] // "number $signum").
244 ($? & 128 ? " (core dumped)" : ""); # POSIX(3pm) has no WCOREDUMP
246 return "failed with unknown wait status ".$?;
250 sub failedcmd_report_cmd {
251 my $intro = shift @_;
252 $intro //= "failed command";
253 { local ($!); printcmd \*STDERR, _us().": $intro:", @_ or die $!; };
256 sub failedcmd_waitstatus {
258 return "failed to fork/exec: $!";
260 return "subprocess ".waitstatusmsg();
262 return "subprocess produced invalid output";
267 # Expects $!,$? as set by close - see below.
268 # To use with system(), set $?=-1 first.
270 # Actual behaviour of perl operations:
271 # success $!==0 $?==0 close of piped open
272 # program failed $!==0 $? >0 close of piped open
273 # syscall failure $! >0 $?=-1 close of piped open
274 # failure $! >0 unchanged close of something else
275 # success trashed $?==0 system
276 # program failed trashed $? >0 system
277 # syscall failure $! >0 unchanged system
278 failedcmd_report_cmd undef, @_;
279 fail failedcmd_waitstatus();
285 failedcmd @_ if system @_;
288 sub cmdoutput_errok {
289 confess Dumper(\@_)." ?" if grep { !defined } @_;
291 open P, "-|", @_ or die "$_[0] $!";
294 { local $/ = undef; $d = <P>; }
296 if (!close P) { printdebug "=>!$?\n"; return undef; }
298 if ($debuglevel > 0) {
301 my $more = (length $' ? '...' : ''); #');
302 $dd =~ s{[^\n -~]|\\}{ sprintf "\\x%02x", ord $& }ge;
303 printdebug "=> \`$dd'",$more,"\n";
309 my $d = cmdoutput_errok @_;
310 defined $d or failedcmd @_;
314 sub link_ltarget ($$) {
316 lstat $old or return undef;
318 $old = cmdoutput qw(realpath --), $old;
320 my $r = link $old, $new;
321 $r = symlink $old, $new if !$r && $!==EXDEV;
322 $r or die "(sym)link $old $new: $!";
327 my $h = Digest::SHA->new(256);
329 return $h->hexdigest();
332 sub git_rev_parse ($) {
333 return cmdoutput qw(git rev-parse), "$_[0]~0";
336 sub git_cat_file ($) {
338 # => ($type, $data) or ('missing', undef)
339 # in scalar context, just the data
340 our ($gcf_pid, $gcf_i, $gcf_o);
342 my @cmd = qw(git cat-file --batch);
343 debugcmd "GCF|", @cmd;
344 $gcf_pid = open2 $gcf_o, $gcf_i, @cmd or die $!;
346 printdebug "GCF>| ", $objname, "\n";
347 print $gcf_i $objname, "\n" or die $!;
349 printdebug "GCF<| ", $x;
350 if ($x =~ m/ (missing)$/) { return ($1, undef); }
351 my ($type, $size) = $x =~ m/^.* (\w+) (\d+)\n/ or die "$objname ?";
353 (read $gcf_o, $data, $size) == $size or die "$objname $!";
355 $x eq "\n" or die "$objname ($_) $!";
356 return ($type, $data);
359 sub git_for_each_ref ($$;$) {
360 my ($pattern,$func,$gitdir) = @_;
361 # calls $func->($objid,$objtype,$fullrefname,$reftail);
362 # $reftail is RHS of ref after refs/[^/]+/
363 # breaks if $pattern matches any ref `refs/blah' where blah has no `/'
364 # $pattern may be an array ref to mean multiple patterns
365 $pattern = [ $pattern ] unless ref $pattern;
366 my @cmd = (qw(git for-each-ref), @$pattern);
367 if (defined $gitdir) {
368 @cmd = ('sh','-ec','cd "$1"; shift; exec "$@"','x', $gitdir, @cmd);
370 open GFER, "-|", @cmd or die $!;
374 printdebug "|> ", $_, "\n";
375 m#^(\w+)\s+(\w+)\s+(refs/[^/]+/(\S+))$# or die "$_ ?";
376 $func->($1,$2,$3,$4);
378 $!=0; $?=0; close GFER or die "$pattern $? $!";
381 sub git_get_ref ($) {
382 # => '' if no such ref
385 s{^refs/}{[r]efs/} or die "$refname $_ ?";
386 return cmdoutput qw(git for-each-ref --format=%(objectname)), $_;
389 sub git_for_each_tag_referring ($$) {
390 my ($objreferring, $func) = @_;
391 # calls $func->($tagobjid,$refobjid,$fullrefname,$tagname);
392 printdebug "git_for_each_tag_referring ",
393 ($objreferring // 'UNDEF'),"\n";
394 git_for_each_ref('refs/tags', sub {
395 my ($tagobjid,$objtype,$fullrefname,$tagname) = @_;
396 return unless $objtype eq 'tag';
397 my $refobjid = git_rev_parse $tagobjid;
399 !defined $objreferring # caller wants them all
400 or $tagobjid eq $objreferring
401 or $refobjid eq $objreferring;
402 $func->($tagobjid,$refobjid,$fullrefname,$tagname);
406 sub is_fast_fwd ($$) {
407 my ($ancestor,$child) = @_;
408 my @cmd = (qw(git merge-base), $ancestor, $child);
409 my $mb = cmdoutput_errok @cmd;
411 return git_rev_parse($mb) eq git_rev_parse($ancestor);
413 $?==256 or failedcmd @cmd;