From 72601ca556210e1d06e05a03e11ac87fd4903aee Mon Sep 17 00:00:00 2001
From: Bryce Kwon <bryce@brycekwon.com>
Date: Mon, 2 Nov 2026 19:06:38 -1000
Subject: Say when logins are unavailable

The way back was signed part way through the form, so while the secret's
directory did not exist, or a library was missing, cgit's error landed
inside the hidden input and the page broke off there with no fields.
---
 tests/extensions/harness.lua   | 21 +++++++++++++++++++++
 tests/extensions/test-auth.lua | 17 ++++++++++++++++-
 2 files changed, 37 insertions(+), 1 deletion(-)

(limited to 'tests/extensions')

diff --git a/tests/extensions/harness.lua b/tests/extensions/harness.lua
index 2fe722f..8c1ba6c 100644
--- a/tests/extensions/harness.lua
+++ b/tests/extensions/harness.lua
@@ -54,14 +54,30 @@ html_url_path = sink(function(s)
 	end))
 end)
 
+-- What a script writes to standard error goes to the web server's error log
+-- under cgit, so it is kept here for a check to read instead.
+local logged = {}
+
+io.stderr = {
+	write = function(self, ...)
+		logged[#logged + 1] = table.concat({ ... })
+		return self
+	end,
+}
+
 function harness.reset()
 	pieces = {}
+	logged = {}
 end
 
 function harness.output()
 	return table.concat(pieces)
 end
 
+function harness.error_log()
+	return table.concat(logged)
+end
+
 function harness.load(script)
 	dofile(script)
 end
@@ -182,6 +198,11 @@ function harness.stub_auth_modules()
 	preload("posix.unistd", {
 		crypt = fake_crypt,
 	})
+	preload("posix.sys.stat", {
+		umask = function()
+			return 18
+		end,
+	})
 	preload("openssl.rand", {
 		bytes = function(count)
 			local out = {}
diff --git a/tests/extensions/test-auth.lua b/tests/extensions/test-auth.lua
index 974544d..3a4fabf 100644
--- a/tests/extensions/test-auth.lua
+++ b/tests/extensions/test-auth.lua
@@ -302,6 +302,18 @@ h.contains("a failed login says so", out,
 	"<p class='login-error' role='alert'>Wrong username or password.</p>")
 h.equals("and leaves the flag out of the way back", way_back_in(out), "/repo/log/?q=x")
 
+-- The real get_secret, pointed at a directory nobody made, cannot sign the
+-- way back, so the page says so whole rather than breaking off in the form.
+h.load_with(script, { { "local secret_filename = \"/var/lib/cgit/auth-secret\"",
+	"local secret_filename = \"no-such-directory/auth-secret\"" } })
+out = run_action("body", {})
+h.contains("a secret that cannot be made leaves a page saying so", out,
+	"<p class='login-error' role='alert'>Logins are unavailable. The server's error log says why.</p>")
+h.excludes("with no form to fill in", out, "<form")
+h.contains("and the error log names the directory", h.error_log(),
+	"as no-such-directory is missing or not writable by cgit\n")
+load_script()
+
 local way_back = secure_value("redirect", "/repo/", 0)
 
 out = login("Alice", password, way_back)
@@ -373,6 +385,9 @@ for _, name in ipairs({ "openssl.rand", "openssl.hmac", "posix.sys.stat", "posix
 end
 h.equals("without the libraries a public repository is served", visit("unlisted"), 1)
 h.check("while a protected one fails closed", not pcall(visit, "secret-repo", session))
-h.check("and so does its login form", not pcall(run_action, "body", {}))
+out = run_action("body", {})
+h.contains("and its login page says logins are unavailable", out, "Logins are unavailable.")
+h.excludes("and no form to fill in", out, "<form")
+h.contains("while the error log names the missing library", h.error_log(), "openssl.rand")
 
 h.finish()
-- 
cgit 2.12.1