Dgit.pm: git_slurp_config_src: Break out from dgit

[dgit.git] / Debian / Dgit.pm

diff --git a/Debian/Dgit.pm b/Debian/Dgit.pm
index e9921d6a33435c5c34164eca3f2dc2174bf1e4ef..3d97848ff2df75b96491a8fc2ac2d6bd5224a86a 100644 (file)
--- a/Debian/Dgit.pm
+++ b/Debian/Dgit.pm
@@ -28,6 +28,8 @@ use IO::Handle;
 use Config;
 use Digest::SHA;
 use Data::Dumper;
+use IPC::Open2;
+use File::Path;
 
 BEGIN {
     use Exporter   ();
@@ -35,7 +37,7 @@ BEGIN {
 
     $VERSION     = 1.00;
     @ISA         = qw(Exporter);
-    @EXPORT      = qw(setup_sigwarn
+    @EXPORT      = qw(setup_sigwarn forkcheck_setup forkcheck_mainprocess
                      dep14_version_mangle
                       debiantags debiantag_old debiantag_new
                      server_branch server_ref
@@ -44,15 +46,20 @@ BEGIN {
                       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
+                      runcmd cmdoutput cmdoutput_errok
+                      git_rev_parse git_cat_file
+                     git_get_ref git_for_each_ref
                       git_for_each_tag_referring is_fast_fwd
                       $package_re $component_re $deliberately_re
+                     $distro_re $versiontag_re $series_filename_re
                       $branchprefix
                       initdebug enabledebug enabledebuglevel
                       printdebug debugcmd
                       $debugprefix *debuglevel *DEBUG
-                      shellquote printcmd messagequote);
+                      shellquote printcmd messagequote
+                      $negate_harmful_gitattrs
+                     git_slurp_config_src
+                      workarea_setup);
     # implicitly uses $main::us
     %EXPORT_TAGS = ( policyflags => [qw(NOFFCHECK FRESHREPO NOCOMMITCHECK)] );
     @EXPORT_OK   = @{ $EXPORT_TAGS{policyflags} };
@@ -63,7 +70,10 @@ 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 $distro_re = $component_re;
+our $versiontag_re = qr{[-+.\%_0-9a-zA-Z/]+};
 our $branchprefix = 'dgit';
+our $series_filename_re = qr{(?:^|\.)series(?!\n)$}s;
 
 # policy hook exit status bits
 # see dgit-repos-server head comment for documentation
@@ -76,10 +86,23 @@ sub NOCOMMITCHECK () { return 0x8; }
 our $debugprefix;
 our $debuglevel = 0;
 
+our $negate_harmful_gitattrs = "-text -eol -crlf -ident -filter";
+
+our $forkcheck_mainprocess;
+
+sub forkcheck_setup () {
+    $forkcheck_mainprocess = $$;
+}
+
+sub forkcheck_mainprocess () {
+    # You must have called forkcheck_setup or setup_sigwarn already
+    getppid != $forkcheck_mainprocess;
+}
+
 sub setup_sigwarn () {
-    our $sigwarn_mainprocess = $$;
+    forkcheck_setup();
     $SIG{__WARN__} = sub { 
-       die $_[0] unless getppid == $sigwarn_mainprocess;
+       die $_[0] if forkcheck_mainprocess;
     };
 }
 
@@ -121,6 +144,7 @@ sub messagequote ($) {
 sub shellquote {
     my @out;
     local $_;
+    defined or confess 'internal error' foreach @_;
     foreach my $a (@_) {
        $_ = $a;
        if (!length || m{[^-=_./:0-9a-z]}i) {
@@ -258,6 +282,12 @@ sub failedcmd {
     fail failedcmd_waitstatus();
 }
 
+sub runcmd {
+    debugcmd "+",@_;
+    $!=0; $?=-1;
+    failedcmd @_ if system @_;
+}
+
 sub cmdoutput_errok {
     confess Dumper(\@_)." ?" if grep { !defined } @_;
     debugcmd "|",@_;
@@ -306,6 +336,29 @@ sub git_rev_parse ($) {
     return cmdoutput qw(git rev-parse), "$_[0]~0";
 }
 
+sub git_cat_file ($) {
+    my ($objname) = @_;
+    # => ($type, $data) or ('missing', undef)
+    # in scalar context, just the data
+    our ($gcf_pid, $gcf_i, $gcf_o);
+    if (!$gcf_pid) {
+       my @cmd = qw(git cat-file --batch);
+       debugcmd "GCF|", @cmd;
+       $gcf_pid = open2 $gcf_o, $gcf_i, @cmd or die $!;
+    }
+    printdebug "GCF>| ", $objname, "\n";
+    print $gcf_i $objname, "\n" or die $!;
+    my $x = <$gcf_o>;
+    printdebug "GCF<| ", $x;
+    if ($x =~ m/ (missing)$/) { return ($1, undef); }
+    my ($type, $size) = $x =~ m/^.* (\w+) (\d+)\n/ or die "$objname ?";
+    my $data;
+    (read $gcf_o, $data, $size) == $size or die "$objname $!";
+    $x = <$gcf_o>;
+    $x eq "\n" or die "$objname ($_) $!";
+    return ($type, $data);
+}
+
 sub git_for_each_ref ($$;$) {
     my ($pattern,$func,$gitdir) = @_;
     # calls $func->($objid,$objtype,$fullrefname,$reftail);
@@ -365,4 +418,50 @@ sub is_fast_fwd ($$) {
     }
 }
 
+sub git_slurp_config_src ($) {
+    my ($src) = @_;
+    # returns $r such that $r->{KEY}[] = VALUE
+    my @cmd = (qw(git config -z --get-regexp), "--$src", qw(.*));
+    debugcmd "|",@cmd;
+
+    local ($debuglevel) = $debuglevel-2;
+    local $/="\0";
+
+    my $r = { };
+    open GITS, "-|", @cmd or die $!;
+    while (<GITS>) {
+       chomp or die;
+       printdebug "=> ", (messagequote $_), "\n";
+       m/\n/ or die "$_ ?";
+       push @{ $r->{$`} }, $'; #';
+    }
+    $!=0; $?=0;
+    close GITS
+       or ($!==0 && $?==256)
+       or failedcmd @cmd;
+    return $r;
+}
+
+sub workarea_setup ($) {
+    # for use in the workarea
+    my ($t_local_git_cfg) = @_;
+    # should be run in a directory .git/FOO/BAR of a working tree
+    runcmd qw(git init -q);
+    runcmd qw(git config gc.auto 0);
+    foreach my $copy (qw(user.email user.name user.useConfigOnly
+                         core.sharedRepository
+                         core.compression core.looseCompression
+                         core.bigFileThreshold core.fsyncObjectFiles)) {
+       my $v = $t_local_git_cfg->{$copy};
+       next unless $v;
+       runcmd qw(git config), $copy, $_ foreach @$v;
+    }
+    rmtree('.git/objects');
+    symlink '../../../../objects','.git/objects' or die $!;
+    ensuredir '.git/info';
+    open GA, "> .git/info/attributes" or die $!;
+    print GA "* $negate_harmful_gitattrs\n" or die $!;
+    close GA or die $!;
+}
+
 1;