lei: disallow "\n" in local externals paths

git 2.11 and earlier could not handle git directories with
newlines in them, nor does libgit2 support them.

Followup-to: d87dd0e679587043 ("config: reject `\n' in `inboxdir'")

5 files changed, 30 insertions, 2 deletions

diff --git a/lib/PublicInbox/LeiExternal.pm b/lib/PublicInbox/LeiExternal.pm
index 47791d4e..b5dd85e1 100644
--- a/lib/PublicInbox/LeiExternal.pm
+++ b/lib/PublicInbox/LeiExternal.pm
@@ -170,9 +170,14 @@ sub lei_add_external {
                 $self->fail(<<""); # TODO: did you mean "update-external?"
 --mirror destination `$location' already exists
 
+        } elsif (-d $location) {
+                index($location, "\n") >= 0 and
+                        return $self->fail("`\\n' not allowed in `$location'");
         }
         if ($location !~ m!\Ahttps?://! && !-d $location) {
                 $mirror // return $self->fail("$location not a directory");
+                index($location, "\n") >= 0 and
+                        return $self->fail("`\\n' not allowed in `$location'");
                 $mirror = ext_canonicalize($mirror);
                 require PublicInbox::LeiMirror;
                 PublicInbox::LeiMirror->start($self, $mirror => $location);
diff --git a/lib/PublicInbox/LeiXSearch.pm b/lib/PublicInbox/LeiXSearch.pm
index 22c8026c..d95a218e 100644
--- a/lib/PublicInbox/LeiXSearch.pm
+++ b/lib/PublicInbox/LeiXSearch.pm
@@ -502,8 +502,10 @@ sub prepare_external {
                 return add_uri($self, URI->new($loc));
         } elsif (-f "$loc/ei.lock") {
                 require PublicInbox::ExtSearch;
+                die "`\\n' not allowed in `$loc'\n" if index($loc, "\n") >= 0;
                 $loc = PublicInbox::ExtSearch->new($loc);
         } elsif (-f "$loc/inbox.lock" || -d "$loc/public-inbox") {
+                die "`\\n' not allowed in `$loc'\n" if index($loc, "\n") >= 0;
                 require PublicInbox::Inbox; # v2, v1
                 $loc = bless { inboxdir => $loc }, 'PublicInbox::Inbox';
         } else {
diff --git a/t/lei-externals.t b/t/lei-externals.t
index 2a92d101..1695ff0b 100644
--- a/t/lei-externals.t
+++ b/t/lei-externals.t
@@ -78,8 +78,12 @@ test_lei(sub {
         ok(!-e $config_file && !-e $store_dir,
                 'nothing created by ls-external');
 
-        ok(!lei('add-external', "$home/nonexistent",
-                "fails on non-existent dir"));
+        ok(!lei('add-external', "$home/nonexistent"),
+                "fails on non-existent dir");
+        like($lei_err, qr/not a directory/, 'noted non-existence');
+        mkdir "$home/new\nline" or BAIL_OUT "mkdir: $!";
+        ok(!lei('add-external', "$home/new\nline"), "fails on newline");
+        like($lei_err, qr/`\\n' not allowed/, 'newline noted in error');
         lei_ok('ls-external', \'ls-external works after add failure');
         is($lei_out.$lei_err, '', 'ls-external still has no output');
         my $cfg = PublicInbox::Config->new($cfg_path);
diff --git a/t/lei-mirror.t b/t/lei-mirror.t
index 1d113e3e..9769f31b 100644
--- a/t/lei-mirror.t
+++ b/t/lei-mirror.t
@@ -29,8 +29,13 @@ test_lei({ tmpdir => $tmpdir }, sub {
         ok(!lei('add-external', $t2, '--mirror', "$http/t2/"),
                 '--mirror fails if reused') or diag "$lei_err.$lei_out = $?";
 
+        ok(!lei('add-external', "$home/t2\nnewline", '--mirror', "$http/t2/"),
+                '--mirror fails on newline');
+        like($lei_err, qr/`\\n' not allowed/, 'newline noted in error');
+
         lei_ok('ls-external');
         like($lei_out, qr!\Q$t2\E!, 'still in ls-externals');
+        unlike($lei_out, qr!\Qnewline\E!, 'newline entry not added');
 
         ok(!lei('add-external', "$t2-fail", '-Lmedium'), '--mirror v2');
         ok(!-d "$t2-fail", 'destination not created on failure');
diff --git a/t/lei.t b/t/lei.t
index 74a775ca..2bf4b862 100644
--- a/t/lei.t
+++ b/t/lei.t
@@ -133,6 +133,18 @@ my $test_fail = sub {
         is($? >> 8, 1, 'chdir at end fails to /dev/null');
         lei('-C', '/dev/null', 'q', 'whatever');
         is($? >> 8, 1, 'chdir at beginning fails to /dev/null');
+
+        for my $lk (qw(ei inbox)) {
+                my $d = "$home/newline\n$lk";
+                mkdir $d;
+                open my $fh, '>', "$d/$lk.lock" or BAIL_OUT "open $d/$lk.lock";
+                for my $fl (qw(-I --only)) {
+                        ok(!lei('q', $fl, $d, 'whatever'),
+                                "newline $lk.lock fails with q $fl");
+                        like($lei_err, qr/`\\n' not allowed/,
+                                "error noted with q $fl");
+                }
+        }
 SKIP: {
         skip 'no curl', 3 unless which('curl');
         lei(qw(q --only http://127.0.0.1:99999/bogus/ t:m));