playground refactoring: Dgit.pm: Expose $local_git_cfg

[dgit.git] / Debian / Dgit.pm

diff --git a/Debian/Dgit.pm b/Debian/Dgit.pm
index ba1c28801aba0acb77fced48bb8966a878dc8973..515a32f600b805634a8b3991e21b702c603dc56d 100644 (file)
--- a/Debian/Dgit.pm
+++ b/Debian/Dgit.pm
@@ -29,6 +29,7 @@ use Config;
 use Digest::SHA;
 use Data::Dumper;
 use IPC::Open2;
+use File::Path;
 
 BEGIN {
     use Exporter   ();
@@ -42,23 +43,28 @@ BEGIN {
                      server_branch server_ref
                       stat_exists link_ltarget
                      hashfile
-                      fail ensuredir executable_on_path
+                      fail ensuredir must_getcwd executable_on_path
                       waitstatusmsg failedcmd_waitstatus
                      failedcmd_report_cmd failedcmd
-                      cmdoutput cmdoutput_errok
+                      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
+                     $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
+                     changedir git_slurp_config_src
+                     playtree_setup);
     # implicitly uses $main::us
-    %EXPORT_TAGS = ( policyflags => [qw(NOFFCHECK FRESHREPO NOCOMMITCHECK)] );
-    @EXPORT_OK   = @{ $EXPORT_TAGS{policyflags} };
+    %EXPORT_TAGS = ( policyflags => [qw(NOFFCHECK FRESHREPO NOCOMMITCHECK)],
+                    playground => [qw($local_git_cfg)]);
+    @EXPORT_OK   = ( @{ $EXPORT_TAGS{policyflags} },
+                    @{ $EXPORT_TAGS{playground} } );
 }
 
 our @EXPORT_OK;
@@ -69,6 +75,7 @@ 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
@@ -81,6 +88,8 @@ sub NOCOMMITCHECK () { return 0x8; }
 our $debugprefix;
 our $debuglevel = 0;
 
+our $negate_harmful_gitattrs = "-text -eol -crlf -ident -filter";
+
 our $forkcheck_mainprocess;
 
 sub forkcheck_setup () {
@@ -215,6 +224,12 @@ sub ensuredir ($) {
     die "mkdir $dir: $!";
 }
 
+sub must_getcwd () {
+    my $d = getcwd();
+    defined $d or fail "getcwd failed: $!";
+    return $d;
+}
+
 sub executable_on_path ($) {
     my ($program) = @_;
     return 1 if $program =~ m{/};
@@ -275,6 +290,12 @@ sub failedcmd {
     fail failedcmd_waitstatus();
 }
 
+sub runcmd {
+    debugcmd "+",@_;
+    $!=0; $?=-1;
+    failedcmd @_ if system @_;
+}
+
 sub cmdoutput_errok {
     confess Dumper(\@_)." ?" if grep { !defined } @_;
     debugcmd "|",@_;
@@ -405,4 +426,64 @@ sub is_fast_fwd ($$) {
     }
 }
 
+sub changedir ($) {
+    my ($newdir) = @_;
+    printdebug "CD $newdir\n";
+    chdir $newdir or confess "chdir: $newdir: $!";
+}
+
+sub git_slurp_config_src ($) {
+    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;
+}
+
+# ========== playground handling ==========
+
+#   $local_git_cfg    hash of arrays of values: git config from $maindir
+
+our $local_git_cfg;
+
+# ----- playtrees -----
+
+sub playtree_setup (;$) {
+    my ($t_local_git_cfg) = @_;
+    $t_local_git_cfg //= $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;