X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=dgit.git;a=blobdiff_plain;f=Debian%2FDgit.pm;h=48aae188560ddc825351b2cd09d0d8cebc0e475d;hp=2be936b87c6a6d3dd23e4acc7664ef2e7dfd2bca;hb=33757ceaca394c2af95930775ee8ca1fd55108cf;hpb=1f0e14f2af07576c71e674a946b84f60f594e653 diff --git a/Debian/Dgit.pm b/Debian/Dgit.pm index 2be936b8..48aae188 100644 --- a/Debian/Dgit.pm +++ b/Debian/Dgit.pm @@ -1,27 +1,248 @@ -# +# -*- 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); - %EXPORT_TAGS = ( ); # eg: TAG => [ qw!name1 name2! ], - @EXPORT_OK = qw(); + @EXPORT = qw(debiantag server_branch server_ref + 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 +# 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 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 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) = @_; $v =~ y/~:/_%/; return "debian/$v"; } +sub server_branch ($) { return "$branchprefix/$_[0]"; } +sub server_ref ($) { return "refs/".server_branch($_[0]); } + +sub stat_exists ($) { + my ($f) = @_; + return 1 if stat $f; + return 0 if $!==&ENOENT; + 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 =

; } + 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 ($$;$) { + my ($pattern,$func,$gitdir) = @_; + # calls $func->($objid,$objtype,$fullrefname,$reftail); + # $reftail is RHS of ref after refs/[^/]+/ + # breaks if $pattern matches any ref `refs/blah' where blah has no `/' + my @cmd = (qw(git for-each-ref), $pattern); + if (defined $gitdir) { + @cmd = ('sh','-ec','cd "$1"; shift; exec "$@"','x', $gitdir, @cmd); + } + open GFER, "-|", @cmd or die $!; + debugcmd "|", @cmd; + while () { + chomp or die "$_ ?"; + printdebug "|> ", $_, "\n"; + m#^(\w+)\s+(\w+)\s+(refs/[^/]+/(\S+))$# or die "$_ ?"; + $func->($1,$2,$3,$4); + } + $!=0; $?=0; close GFER or die "$pattern $? $!"; +} + +sub git_get_ref ($) { + # => '' if no such ref + my ($refname) = @_; + my $_ = $refname; + s{^refs/}{[r]efs/} or die "$refname $_ ?"; + return cmdoutput qw(git for-each-ref --format=%(objectname)), $_; +} + +sub git_for_each_tag_referring ($$) { + 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;