-#
+# -*- perl -*-
package Debian::Dgit;
use strict;
use warnings;
+use POSIX;
+use IO::Handle;
+use Config;
+
BEGIN {
use Exporter ();
our ($VERSION, @ISA, @EXPORT, @EXPORT_OK, %EXPORT_TAGS);
$VERSION = 1.00;
@ISA = qw(Exporter);
@EXPORT = qw(debiantag server_branch server_ref
- stat_exists
- $package_re $branchprefix);
- %EXPORT_TAGS = ( policyflags => qw() );
- @EXPORT_OK = qw();
+ stat_exists fail ensuredir waitstatusmsg 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);
+ # implicitly uses $main::us
+ %EXPORT_TAGS = ( policyflags => [qw(NOFFCHECK FRESHREPO)] );
+ @EXPORT_OK = @{ $EXPORT_TAGS{policyflags} };
}
our @EXPORT_OK;
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
-# any unexpected bits mean failure, and then known set bits are ignored
+# see dgit-repos-server head comment for documentation
+# 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; }
+
+our $debugprefix;
+our $debuglevel = 0;
+
+sub initdebug ($) {
+ ($debugprefix) = @_;
+ open DEBUG, ">/dev/null" or die $!;
+}
-sub NOFFCHECK () { return 2; }
-# suppress dgit-repos-server's ff check ("push" only)
+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 FRESHREPO () { return 4; }
-# blow away repo right away (ie, as if before push or fetch)
-# ("check-package" and "push" only)
+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 $debuglevel>0;
+}
sub debiantag ($) {
my ($v) = @_;
die "stat $f: $!";
}
+sub _us () {
+ $::us // ($0 =~ m#[^/]*$#, $&);
+}
+
+sub fail {
+ my $s = "@_\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: $!";
+}
+
+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 ".$?;
+ }
+}
+
+sub failedcmd {
+ { local ($!); printcmd \*STDERR, _us().": failed command:", @_ or die $!; };
+ if ($!) {
+ fail "failed to fork/exec: $!";
+ } elsif ($?) {
+ fail "subprocess ".waitstatusmsg();
+ } else {
+ fail "subprocess produced invalid output";
+ }
+}
+
+sub cmdoutput_errok {
+ die Dumper(\@_)." ?" if grep { !defined } @_;
+ debugcmd "|",@_;
+ open P, "-|", @_ or die $!;
+ my $d;
+ $!=0; $?=0;
+ { local $/ = undef; $d = <P>; }
+ die $! if P->error;
+ if (!close P) { printdebug "=>!$?\n"; return undef; }
+ chomp $d;
+ $d =~ m/^.*/;
+ printdebug "=> \`$&'",(length $' ? '...' : ''),"\n" if $debuglevel>0; #';
+ return $d;
+}
+
+sub cmdoutput {
+ my $d = cmdoutput_errok @_;
+ defined $d or failedcmd @_;
+ return $d;
+}
+
+sub git_rev_parse ($) {
+ return cmdoutput qw(git rev-parse), "$_[0]~0";
+}
+
+sub git_for_each_ref ($$;$) {
+ my ($pattern,$func,$gitdir) = @_;
+ # calls $func->($objid,$objtype,$fullrefname,$reftail);
+ # $reftail is RHS of ref after refs/[^/]+/
+ # breaks if $pattern matches any ref `refs/blah' where blah has no `/'
+ my @cmd = (qw(git for-each-ref), $pattern);
+ if (defined $gitdir) {
+ @cmd = ('sh','-ec','cd "$1"; shift; exec "$@"','x', $gitdir, @cmd);
+ }
+ open GFER, "-|", @cmd or die $!;
+ debugcmd "|", @cmd;
+ while (<GFER>) {
+ chomp or die "$_ ?";
+ printdebug "|> ", $_, "\n";
+ m#^(\w+)\s+(\w+)\s+(refs/[^/]+/(\S+))$# or die "$_ ?";
+ $func->($1,$2,$3,$4);
+ }
+ $!=0; $?=0; close GFER or die "$pattern $? $!";
+}
+
+sub git_get_ref ($) {
+ # => '' if no such ref
+ my ($refname) = @_;
+ local $_ = $refname;
+ s{^refs/}{[r]efs/} or die "$refname $_ ?";
+ return cmdoutput qw(git for-each-ref --format=%(objectname)), $_;
+}
+
+sub git_for_each_tag_referring ($$) {
+ my ($objreferring, $func) = @_;
+ # calls $func->($tagobjid,$refobjid,$fullrefname,$tagname);
+ printdebug "git_for_each_tag_referring ",
+ ($objreferring // 'UNDEF'),"\n";
+ git_for_each_ref('refs/tags', sub {
+ 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