public-inbox-init: fix multi-address setup

We must support multi-address mailing lists, so we do not
clobber existing addresses.  However, we need to ensure
idempotency and ensure existing addresses are not reset.

Furthermore, we were not parsing the existing config correctly
due to a leaking $/.

1 files changed, 18 insertions, 9 deletions

diff --git a/public-inbox-init b/public-inbox-init
index 5fc9d3ef..2d244029 100644
--- a/public-inbox-init
+++ b/public-inbox-init
@@ -18,6 +18,7 @@ my $git_dir = shift @ARGV or usage();
 my $http_url = shift @ARGV or usage();
 my (@address) = @ARGV;
 @address or usage();
+my %seen;
 
 my $pi_config = PublicInbox::Config->default_file;
 my $dir = dirname($pi_config);
@@ -25,8 +26,11 @@ mkpath($dir); # will croak on fatal errors
 my ($fh, $filename) = tempfile('pi-init-XXXXXXXX', DIR => $dir);
 if (-e $pi_config) {
         open(my $oh, '<', $pi_config) or die "unable to read $pi_config: $!\n";
-        local $/;
-        my $old = <$oh>;
+        my $old;
+        {
+                local $/;
+                $old = <$oh>;
+        }
         print $fh $old or die "failed to write: $!\n";
         close $oh or die "failed to close $pi_config: $!\n";
 
@@ -36,12 +40,16 @@ if (-e $pi_config) {
         my $conflict;
         foreach my $addr (@address) {
                 my $found = $cfg->lookup($addr);
-                if ($found && ($found->{listname} ne $name)) {
-                        print STDERR
-                                "`$addr' already defined for ",
-                                "`$found->{listname}',\n",
-                                "does not match intend `$name'\n";
-                        $conflict = 1;
+                if ($found) {
+                        if ($found->{listname} ne $name) {
+                                print STDERR
+                                        "`$addr' already defined for ",
+                                        "`$found->{listname}',\n",
+                                        "does not match intend `$name'\n";
+                                $conflict = 1;
+                        } else {
+                                $seen{lc($addr)} = 1;
+                        }
                 }
         }
 
@@ -54,7 +62,8 @@ my @x = (qw/git config/, "--file=$filename");
 $git_dir = expand_filename($git_dir);
 x(qw(git init -q --bare), $git_dir);
 foreach my $addr (@address) {
-        x(@x, "$pfx.address", $addr);
+        next if $seen{lc($addr)};
+        x(@x, "--add", "$pfx.address", $addr);
 }
 x(@x, "$pfx.url", $http_url);
 x(@x, "$pfx.mainrepo", $git_dir);