# -*- perl -*-
+# dgit
+# Debian::Dgit: functions common to dgit and its helpers and servers
+#
+# Copyright (C) 2015-2016 Ian Jackson
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
package Debian::Dgit;
use strict;
use warnings;
+use Carp;
use POSIX;
+use IO::Handle;
+use Config;
+use Digest::SHA;
+use Data::Dumper;
BEGIN {
use Exporter ();
$VERSION = 1.00;
@ISA = qw(Exporter);
- @EXPORT = qw(debiantag server_branch server_ref
- stat_exists git_for_each_ref
- $package_re $component_re $branchprefix);
+ @EXPORT = qw(setup_sigwarn
+ debiantags debiantag_old debiantag_new
+ server_branch server_ref
+ stat_exists link_ltarget
+ hashfile
+ fail ensuredir executable_on_path
+ waitstatusmsg failedcmd_waitstatus
+ failedcmd_report_cmd failedcmd
+ cmdoutput cmdoutput_errok
+ git_rev_parse git_get_ref git_for_each_ref
+ git_for_each_tag_referring is_fast_fwd
+ $package_re $component_re $deliberately_re
+ $branchprefix
+ initdebug enabledebug enabledebuglevel
+ printdebug debugcmd
+ $debugprefix *debuglevel *DEBUG
+ shellquote printcmd messagequote);
+ # implicitly uses $main::us
%EXPORT_TAGS = ( policyflags => [qw(NOFFCHECK FRESHREPO)] );
@EXPORT_OK = @{ $EXPORT_TAGS{policyflags} };
}
our $package_re = '[0-9a-z][-+.0-9a-z]*';
our $component_re = '[0-9a-zA-Z][-+.0-9a-zA-Z]*';
+our $deliberately_re = "(?:TEST-)?$package_re";
our $branchprefix = 'dgit';
# policy hook exit status bits
# see dgit-repos-server head comment for documentation
-# 1 is reserved in case something fails with `exit 1'
+# 1 is reserved in case something fails with `exit 1' and to spot
+# dynamic loader, runtime, etc., failures, which report 127 or 255
sub NOFFCHECK () { return 0x2; }
sub FRESHREPO () { return 0x4; }
-# 0x80 is reserved
-sub debiantag ($) {
- my ($v) = @_;
+our $debugprefix;
+our $debuglevel = 0;
+
+sub setup_sigwarn () {
+ our $sigwarn_mainprocess = $$;
+ $SIG{__WARN__} = sub {
+ die $_[0] unless getppid == $sigwarn_mainprocess;
+ };
+}
+
+sub initdebug ($) {
+ ($debugprefix) = @_;
+ open DEBUG, ">/dev/null" or die $!;
+}
+
+sub enabledebug () {
+ open DEBUG, ">&STDERR" or die $!;
+ DEBUG->autoflush(1);
+ $debuglevel ||= 1;
+}
+
+sub enabledebuglevel ($) {
+ my ($newlevel) = @_; # may be undef (eg from env var)
+ die if $debuglevel;
+ $newlevel //= 0;
+ $newlevel += 0;
+ return unless $newlevel;
+ $debuglevel = $newlevel;
+ enabledebug();
+}
+
+sub printdebug {
+ print DEBUG $debugprefix, @_ or die $! if $debuglevel>0;
+}
+
+sub messagequote ($) {
+ local ($_) = @_;
+ s{\\}{\\\\}g;
+ s{\n}{\\n}g;
+ s{\x08}{\\b}g;
+ s{\t}{\\t}g;
+ s{[\000-\037\177]}{ sprintf "\\x%02x", ord $& }ge;
+ $_;
+}
+
+sub shellquote {
+ my @out;
+ local $_;
+ foreach my $a (@_) {
+ $_ = $a;
+ if (!length || m{[^-=_./:0-9a-z]}i) {
+ s{['\\]}{'\\$&'}g;
+ push @out, "'$_'";
+ } else {
+ push @out, $_;
+ }
+ }
+ return join ' ', @out;
+}
+
+sub printcmd {
+ my $fh = shift @_;
+ my $intro = shift @_;
+ print $fh $intro," " or die $!;
+ print $fh shellquote @_ or die $!;
+ print $fh "\n" or die $!;
+}
+
+sub debugcmd {
+ my $extraprefix = shift @_;
+ printcmd(\*DEBUG,$debugprefix.$extraprefix,@_) if $debuglevel>0;
+}
+
+sub debiantag_old ($$) {
+ my ($v,$distro) = @_;
+ $v =~ y/~:/_%/;
+ return "$distro/$v";
+}
+
+sub debiantag_new ($$) {
+ my ($v,$distro) = @_;
$v =~ y/~:/_%/;
- return "debian/$v";
+ return "archive/$distro/$v";
+}
+
+sub debiantags ($$) {
+ my ($version,$distro) = @_;
+ map { $_->($version, $distro) } (\&debiantag_new, \&debiantag_old);
}
sub server_branch ($) { return "$branchprefix/$_[0]"; }
die "stat $f: $!";
}
-sub git_for_each_ref ($$) {
- my ($pattern,$func) = @_;
+sub _us () {
+ $::us // ($0 =~ m#[^/]*$#, $&);
+}
+
+sub fail {
+ my $s = "@_\n";
+ $s =~ s/\n\n$/\n/;
+ my $prefix = _us().": ";
+ $s =~ s/^/$prefix/gm;
+ die $s;
+}
+
+sub ensuredir ($) {
+ my ($dir) = @_; # does not create parents
+ return if mkdir $dir;
+ return if $! == EEXIST;
+ die "mkdir $dir: $!";
+}
+
+sub executable_on_path ($) {
+ my ($program) = @_;
+ return 1 if $program =~ m{/};
+ my @path = split /:/, ($ENV{PATH} // "/usr/local/bin:/bin:/usr/bin");
+ foreach my $pe (@path) {
+ my $here = "$pe/$program";
+ return $here if stat_exists $here && -x _;
+ }
+ return undef;
+}
+
+our @signames = split / /, $Config{sig_name};
+
+sub waitstatusmsg () {
+ if (!$?) {
+ return "terminated, reporting successful completion";
+ } elsif (!($? & 255)) {
+ return "failed with error exit status ".WEXITSTATUS($?);
+ } elsif (WIFSIGNALED($?)) {
+ my $signum=WTERMSIG($?);
+ return "died due to fatal signal ".
+ ($signames[$signum] // "number $signum").
+ ($? & 128 ? " (core dumped)" : ""); # POSIX(3pm) has no WCOREDUMP
+ } else {
+ return "failed with unknown wait status ".$?;
+ }
+}
+
+sub failedcmd_report_cmd {
+ my $intro = shift @_;
+ $intro //= "failed command";
+ { local ($!); printcmd \*STDERR, _us().": $intro:", @_ or die $!; };
+}
+
+sub failedcmd_waitstatus {
+ if ($? < 0) {
+ return "failed to fork/exec: $!";
+ } elsif ($?) {
+ return "subprocess ".waitstatusmsg();
+ } else {
+ return "subprocess produced invalid output";
+ }
+}
+
+sub failedcmd {
+ # Expects $!,$? as set by close - see below.
+ # To use with system(), set $?=-1 first.
+ #
+ # Actual behaviour of perl operations:
+ # success $!==0 $?==0 close of piped open
+ # program failed $!==0 $? >0 close of piped open
+ # syscall failure $! >0 $?=-1 close of piped open
+ # failure $! >0 unchanged close of something else
+ # success trashed $?==0 system
+ # program failed trashed $? >0 system
+ # syscall failure $! >0 unchanged system
+ failedcmd_report_cmd undef, @_;
+ fail failedcmd_waitstatus();
+}
+
+sub cmdoutput_errok {
+ confess Dumper(\@_)." ?" if grep { !defined } @_;
+ debugcmd "|",@_;
+ open P, "-|", @_ or die "$_[0] $!";
+ my $d;
+ $!=0; $?=0;
+ { local $/ = undef; $d = <P>; }
+ die $! if P->error;
+ if (!close P) { printdebug "=>!$?\n"; return undef; }
+ chomp $d;
+ if ($debuglevel > 0) {
+ $d =~ m/^.*/;
+ my $dd = $&;
+ my $more = (length $' ? '...' : ''); #');
+ $dd =~ s{[^\n -~]|\\}{ sprintf "\\x%02x", ord $& }ge;
+ printdebug "=> \`$dd'",$more,"\n";
+ }
+ return $d;
+}
+
+sub cmdoutput {
+ my $d = cmdoutput_errok @_;
+ defined $d or failedcmd @_;
+ return $d;
+}
+
+sub link_ltarget ($$) {
+ my ($old,$new) = @_;
+ lstat $old or return undef;
+ if (-l _) {
+ $old = cmdoutput qw(realpath --), $old;
+ }
+ link $old, $new or die "link $old $new: $!";
+}
+
+sub hashfile ($) {
+ my ($fn) = @_;
+ my $h = Digest::SHA->new(256);
+ $h->addfile($fn);
+ return $h->hexdigest();
+}
+
+sub git_rev_parse ($) {
+ return cmdoutput qw(git rev-parse), "$_[0]~0";
+}
+
+sub git_for_each_ref ($$;$) {
+ my ($pattern,$func,$gitdir) = @_;
# calls $func->($objid,$objtype,$fullrefname,$reftail);
- # $reftail is RHS of ref after refs/\w+/
+ # $reftail is RHS of ref after refs/[^/]+/
# breaks if $pattern matches any ref `refs/blah' where blah has no `/'
- my $fh = new IO::File "-|", qw(git for-each-ref), $pattern or die $!;
- while (<$fh>) {
- m#^(\w+)\s+(\w+)\s+(refs/\w+/(\S+))\s# or die "$_ ?";
+ # $pattern may be an array ref to mean multiple patterns
+ $pattern = [ $pattern ] unless ref $pattern;
+ my @cmd = (qw(git for-each-ref), @$pattern);
+ if (defined $gitdir) {
+ @cmd = ('sh','-ec','cd "$1"; shift; exec "$@"','x', $gitdir, @cmd);
+ }
+ open GFER, "-|", @cmd or die $!;
+ debugcmd "|", @cmd;
+ while (<GFER>) {
+ chomp or die "$_ ?";
+ printdebug "|> ", $_, "\n";
+ m#^(\w+)\s+(\w+)\s+(refs/[^/]+/(\S+))$# or die "$_ ?";
$func->($1,$2,$3,$4);
}
- $!=0; $?=0; close $fh or die "$pattern $? $!";
+ $!=0; $?=0; close GFER or die "$pattern $? $!";
+}
+
+sub git_get_ref ($) {
+ # => '' if no such ref
+ my ($refname) = @_;
+ local $_ = $refname;
+ s{^refs/}{[r]efs/} or die "$refname $_ ?";
+ return cmdoutput qw(git for-each-ref --format=%(objectname)), $_;
}
sub git_for_each_tag_referring ($$) {
my ($objreferring, $func) = @_;
- # calls $func->($objid,$fullrefname,$tagname);
+ # calls $func->($tagobjid,$refobjid,$fullrefname,$tagname);
+ printdebug "git_for_each_tag_referring ",
+ ($objreferring // 'UNDEF'),"\n";
git_for_each_ref('refs/tags', sub {
- my ($objid,$objtype,$fullrefname,$tagname) = @_;
- next unless $objtype eq 'tag';
- next if defined $objreferring and $objid ne $objreferring;
- $func->($objid,$fullrefname,$tagname);
+ my ($tagobjid,$objtype,$fullrefname,$tagname) = @_;
+ return unless $objtype eq 'tag';
+ my $refobjid = git_rev_parse $tagobjid;
+ return unless
+ !defined $objreferring # caller wants them all
+ or $tagobjid eq $objreferring
+ or $refobjid eq $objreferring;
+ $func->($tagobjid,$refobjid,$fullrefname,$tagname);
});
}
+sub is_fast_fwd ($$) {
+ my ($ancestor,$child) = @_;
+ my @cmd = (qw(git merge-base), $ancestor, $child);
+ my $mb = cmdoutput_errok @cmd;
+ if (defined $mb) {
+ return git_rev_parse($mb) eq git_rev_parse($ancestor);
+ } else {
+ $?==256 or failedcmd @cmd;
+ return 0;
+ }
+}
+
1;
~ianmdlvl / dgit.git / blobdiff