[PATCH 03/15] config: reject newlines consistently in dir names

[Eric Wong <e@80x24.org>]

Explicitly drop support for "\n" in git coderepo pathnames as
we do other stuff.  Gcf2 (our libgit2 helper) was always
broken with "\n" in pathnames, and I'm not sure if cgit config
files work with them, either.  Dealing with newline characters
requires extra complexity that I'm not willing to deal with when
managing alternates files.
---
 lib/PublicInbox/Config.pm | 32 ++++++++++++++------------------
 1 file changed, 14 insertions(+), 18 deletions(-)

diff --git a/lib/PublicInbox/Config.pm b/lib/PublicInbox/Config.pm
index 779e3140..6bebf790 100644
--- a/lib/PublicInbox/Config.pm
+++ b/lib/PublicInbox/Config.pm
@@ -361,12 +361,19 @@ sub parse_cgitrc {
 	cgit_repo_merge($self, $repo->{dir}, $repo) if $repo;
 }
 
+sub valid_dir ($$) {
+	my $dir = get_1($_[0], $_[1]) // return;
+	index($dir, "\n") < 0 ? $dir : do {
+		warn "E: `$_[1]=$dir' must not contain `\\n'\n";
+		undef;
+	}
+}
+
 # parse a code repo, only git is supported at the moment
 sub fill_coderepo {
 	my ($self, $nick) = @_;
 	my $pfx = "coderepo.$nick";
-	my $dir = $self->{"$pfx.dir"} // return undef; # aka "GIT_DIR"
-	my $git = PublicInbox::Git->new($dir);
+	my $git = PublicInbox::Git->new(valid_dir($self, "$pfx.dir") // return);
 	if (defined(my $cgits = $self->{"$pfx.cgiturl"})) {
 		$git->{cgit_url} = $cgits = _array($cgits);
 		$self->{"$pfx.cgiturl"} = $cgits;
@@ -450,18 +457,15 @@ sub _fill_ibx {
 		my $v = $self->{"$pfx.$k"};
 		$ibx->{$k} = $v if defined $v;
 	}
-	for my $k (qw(filter inboxdir newsgroup replyto httpbackendmax feedmax
+	for my $k (qw(filter newsgroup replyto httpbackendmax feedmax
 			indexlevel indexsequentialshard boost)) {
 		my $v = get_1($self, "$pfx.$k") // next;
 		$ibx->{$k} = $v;
 	}
 
 	# "mainrepo" is backwards compatibility:
-	my $dir = $ibx->{inboxdir} //= $self->{"$pfx.mainrepo"} // return;
-	if (index($dir, "\n") >= 0) {
-		warn "E: `$dir' must not contain `\\n'\n";
-		return;
-	}
+	my $dir = $ibx->{inboxdir} = valid_dir($self, "$pfx.inboxdir") //
+				valid_dir($self, "$pfx.mainrepo") // return;
 	for my $k (qw(obfuscate)) {
 		my $v = $self->{"$pfx.$k"} // next;
 		if (defined(my $bval = git_bool($v))) {
@@ -548,12 +552,8 @@ sub _fill_ei ($$) {
 	my ($self, $name) = @_;
 	eval { require PublicInbox::ExtSearch } or return;
 	my $pfx = "extindex.$name";
-	my $d = $self->{"$pfx.topdir"} // return;
+	my $d = valid_dir($self, "$pfx.topdir") // return;
 	-d $d or return;
-	if (index($d, "\n") >= 0) {
-		warn "E: `$d' must not contain `\\n'\n";
-		return;
-	}
 	my $es = PublicInbox::ExtSearch->new($d);
 	for my $k (qw(indexlevel indexsequentialshard)) {
 		my $v = get_1($self, "$pfx.$k") // next;
@@ -573,12 +573,8 @@ sub _fill_csrch ($$) {
 	return if $name ne '' && !valid_foo_name($name, 'cindex');
 	eval { require PublicInbox::CodeSearch } or return;
 	my $pfx = "cindex.$name";
-	my $d = $self->{"$pfx.topdir"} // return;
+	my $d = valid_dir($self, "$pfx.topdir") // return;
 	-d $d or return;
-	if (index($d, "\n") >= 0) {
-		warn "E: `$d' must not contain `\\n'\n";
-		return;
-	}
 	my $csrch = PublicInbox::CodeSearch->new($d, $self);
 	for my $k (qw(localprefix)) {
 		my $v = $self->{"$pfx.$k"} // next;