When clicking on the linked Git clone URL of a package base, users are
faced with a 404 error page since the URL is not supposed to be opened
in a web browser. Add some notes to 404 error pages corresponding to Git
clone URLs that explain how to use them instead.

Fixes FS#51266.

Signed-off-by: Lukas Fleischer <[email protected]>
---
 web/html/404.php | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/web/html/404.php b/web/html/404.php
index a47ae1e..757c485 100644
--- a/web/html/404.php
+++ b/web/html/404.php
@@ -2,12 +2,45 @@
 
 set_include_path(get_include_path() . PATH_SEPARATOR . '../lib');
 
+$path = $_SERVER['PATH_INFO'];
+$tokens = explode('/', $path);
+
+if (preg_match('/^([a-z0-9][a-z0-9.+_-]*?)(\.git)?$/', $tokens[1], $matches)) {
+       $gitpkg = $matches[1];
+       if (pkg_from_name($gitpkg)) {
+               $gitcmd = 'git clone ' . sprintf(config_get('options', 
'git_clone_uri_anon'), htmlspecialchars($gitpkg));
+               $gitlink = get_pkgbase_uri($gitpkg);
+       } else {
+               unset($gitpkg);
+       }
+} else {
+       unset($gitpkg);
+}
+
 html_header( __("Page Not Found") );
 ?>
 
 <div id="error-page" class="box 404">
        <h2>404 - <?= __("Page Not Found") ?></h2>
        <p><?= __("Sorry, the page you've requested does not exist.") ?></p>
+       <?php if (isset($gitpkg)): ?>
+       <ul>
+               <li>
+                       <strong><?= __("Note") ?>:</strong>
+                       <?= __("Git clone URLs are not meant to be opened in a 
browser.") ?>
+               </li>
+               <li>
+                       <?= __("To clone the Git repository of %s, run %s.",
+                               '<strong>' . htmlspecialchars($gitpkg) . 
'</strong>',
+                               '<code>' . htmlspecialchars($gitcmd) . 
'</code>') ?>
+               </li>
+               <li>
+                       <?= __("Click %shere%s to return to the %s details 
page.",
+                               '<a href="' . htmlspecialchars($gitlink, 
ENT_QUOTES) . '">', '</a>',
+                               '<strong>' . htmlspecialchars($gitpkg) . 
'</strong>') ?>
+               </li>
+       </ul>
+       <?php endif; ?>
 </div>
 
 <?php
-- 
2.10.0

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