Maintain a list of virtual provisions of packages from the official
binary package repositories. The list can be updated using the aurblup
script, e.g. via a cronjob.

This allows for adding proper links to package dependencies: If an AUR
package depends on a package from the official repositories (or on a
name provided by a package from the official repositories), add a link
to the corresponding archweb package details page. If an AUR package
depends on another AUR package (or on a name provided by another AUR
package), add a link to the corresponding aurweb package details page.
Otherwise, just display the name and do not add a link at all.

Fixes FS#46549.

Signed-off-by: Lukas Fleischer <[email protected]>
---
 schema/aur-schema.sql    | 10 ++++++++
 scripts/aurblup.py       | 13 ++++++++++
 upgrading/4.2.0.txt      | 11 +++++++++
 web/lib/pkgfuncs.inc.php | 64 ++++++++++++++++++++++++++++++++++++------------
 4 files changed, 82 insertions(+), 16 deletions(-)
 create mode 100644 upgrading/4.2.0.txt

diff --git a/schema/aur-schema.sql b/schema/aur-schema.sql
index 53dc468..0a0c806 100644
--- a/schema/aur-schema.sql
+++ b/schema/aur-schema.sql
@@ -301,6 +301,16 @@ CREATE TABLE PackageBlacklist (
        UNIQUE (Name)
 ) ENGINE = InnoDB;
 
+-- Providers in the official repositories
+--
+CREATE TABLE OfficialProviders (
+       ID INTEGER UNSIGNED NOT NULL AUTO_INCREMENT,
+       Name VARCHAR(64) NOT NULL,
+       Provides VARCHAR(64) NOT NULL,
+       PRIMARY KEY (ID)
+) ENGINE = InnoDB;
+CREATE UNIQUE INDEX ProviderNameProvides ON OfficialProviders (Name, Provides);
+
 -- Define package request types
 --
 CREATE TABLE RequestTypes (
diff --git a/scripts/aurblup.py b/scripts/aurblup.py
index d6d0c3c..5397528 100755
--- a/scripts/aurblup.py
+++ b/scripts/aurblup.py
@@ -18,6 +18,7 @@ sync_dbs = config.get('aurblup', 'sync-dbs').split(' ')
 servers = config.get('aurblup', 'servers').split(' ')
 
 blacklist = set()
+providers = set()
 
 h = pyalpm.Handle("/", db_path)
 for sync_db in sync_dbs:
@@ -30,6 +31,8 @@ for sync_db in sync_dbs:
     for pkg in repo.pkgcache:
         blacklist.add(pkg.name)
         [blacklist.add(x) for x in pkg.replaces]
+        providers.add((pkg.name, pkg.name))
+        [providers.add((pkg.name, x)) for x in pkg.provides]
 
 db = mysql.connector.connect(host=aur_db_host, user=aur_db_user,
                              passwd=aur_db_pass, db=aur_db_name,
@@ -44,5 +47,15 @@ for pkg in blacklist.difference(oldblacklist):
 for pkg in oldblacklist.difference(blacklist):
     cur.execute("DELETE FROM PackageBlacklist WHERE Name = %s", [pkg])
 
+cur.execute("SELECT Name, Provides FROM OfficialProviders")
+oldproviders = set(cur.fetchall())
+
+for pkg, provides in providers.difference(oldproviders):
+    cur.execute("INSERT INTO OfficialProviders (Name, Provides) "
+                "VALUES (%s, %s)", [pkg, provides])
+for pkg, provides in oldproviders.difference(providers):
+    cur.execute("DELETE FROM OfficialProviders "
+                "WHERE Name = %s AND Provides = %s", [pkg, provides])
+
 db.commit()
 db.close()
diff --git a/upgrading/4.2.0.txt b/upgrading/4.2.0.txt
new file mode 100644
index 0000000..37cbeae
--- /dev/null
+++ b/upgrading/4.2.0.txt
@@ -0,0 +1,11 @@
+1. Add a new table to store providers from official packages:
+
+----
+CREATE TABLE OfficialProviders (
+       ID INTEGER UNSIGNED NOT NULL AUTO_INCREMENT,
+       Name VARCHAR(64) NOT NULL,
+       Provides VARCHAR(64) NOT NULL,
+       PRIMARY KEY (ID)
+) ENGINE = InnoDB;
+CREATE UNIQUE INDEX ProviderNameProvides ON OfficialProviders (Name, Provides);
+----
diff --git a/web/lib/pkgfuncs.inc.php b/web/lib/pkgfuncs.inc.php
index 66bc249..717085d 100644
--- a/web/lib/pkgfuncs.inc.php
+++ b/web/lib/pkgfuncs.inc.php
@@ -168,6 +168,9 @@ function pkg_providers($name) {
        $q.= "INNER JOIN RelationTypes rt ON rt.ID = pr.RelTypeID ";
        $q.= "WHERE rt.Name = 'provides' ";
        $q.= "AND pr.RelName = " . $dbh->quote($name);
+       $q.= "UNION ";
+       $q.= "SELECT 0, Name FROM OfficialProviders ";
+       $q.= "WHERE Provides = " . $dbh->quote($name);
        $result = $dbh->query($q);
 
        if (!$result) {
@@ -281,6 +284,29 @@ function pkg_deplink_annotation($type, $arch, $desc=false) 
{
 }
 
 /**
+ * Get the HTML code to display a package provider link
+ *
+ * @param string $name The name of the provider
+ * @param bool $official True if the package is in the official repositories
+ *
+ * @return string The HTML code of the link to display
+ */
+function pkg_provider_link($name, $official) {
+       $link = '<a href="';
+       if ($official) {
+               $link .= 'https://www.archlinux.org/packages/?q=' .
+                       urlencode($name);
+       } else {
+               $link .= htmlspecialchars(get_pkg_uri($name), ENT_QUOTES);
+       }
+       $link .= '" title="' . __('View packages details for') . ' ';
+       $link .= htmlspecialchars($name) . '">';
+       $link .= htmlspecialchars($name) . '</a>';
+
+       return $link;
+}
+
+/**
  * Get the HTML code to display a package dependency link
  *
  * @param string $name The name of the dependency
@@ -312,31 +338,37 @@ function pkg_depend_link($name, $type, $cond, $arch, 
$pkg_id) {
                $providers = pkg_providers($name);
        }
 
+       $link = htmlspecialchars($name);
+       foreach ($providers as $provider) {
+               if ($provider[1] == $name) {
+                       $is_official = ($provider[0] == 0);
+                       $name = $provider[1];
+                       $link = pkg_provider_link($name, $is_official);
+                       break;
+               }
+       }
+       $link .= ' ' . htmlspecialchars($cond);
+
+       foreach ($providers as $key => $provider) {
+               if ($provider[1] == $name) {
+                       unset($providers[$key]);
+               }
+       }
+
        if (count($providers) > 0) {
-               $link = htmlspecialchars($name) . ' ';
                $link .= '<span class="virtual-dep">(';
                foreach ($providers as $provider) {
+                       $is_official = ($provider[0] == 0);
                        $name = $provider[1];
-                       $link .= '<a href="';
-                       $link .= htmlspecialchars(get_pkg_uri($name), 
ENT_QUOTES);
-                       $link .= '" title="' . __('View packages details for') 
.' ' . htmlspecialchars($name) . '">';
-                       $link .= htmlspecialchars($name) . '</a>, ';
+                       $link .= pkg_provider_link($name, $is_official) . ', ';
                }
                $link = substr($link, 0, -2);
                $link .= ')</span>';
-       } else {
-               $link = '<a href="';
-               if (is_null($pkg_id)) {
-                       $link .= 'https://www.archlinux.org/packages/?q=' . 
urlencode($name);
-               } else {
-                       $link .= htmlspecialchars(get_pkg_uri($name), 
ENT_QUOTES);
-               }
-               $link .= '" title="' . __('View packages details for') .' ' . 
htmlspecialchars($name) . '">';
-               $link .= htmlspecialchars($name) . '</a>';
-               $link .= htmlspecialchars($cond);
        }
 
-       return $link . pkg_deplink_annotation($type, $arch, $desc);
+       $link .= pkg_deplink_annotation($type, $arch, $desc);
+
+       return $link;
 }
 
 /**
-- 
2.6.1

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