diff -r 490b7c517000 -r fb8a7962f2ae src/Pure/Admin/isabelle_devel.scala
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/Pure/Admin/isabelle_devel.scala	Mon May 08 12:04:58 2017 +0200
@@ -0,0 +1,68 @@
+/*  Title:      Pure/Admin/isabelle_devel.scala
+    Author:     Makarius
+
+Website for Isabelle development resources.
+*/
+
+package isabelle
+
+
+object Isabelle_Devel
+{
+  val root_dir = Path.explode("~/html-data/devel")
+
+  val release_snapshot_dir = root_dir + Path.explode("release_snapshot")
+  val build_log_db = root_dir + Path.explode("build_log.db")
+  val build_status_dir = root_dir + Path.explode("build_status")
+
+  val log_dirs =
+    List(Path.explode("~/log"), Path.explode("~/afp/log"), Path.explode("~/cronjob/log"))
+
+
+  /* release snapshot */
+
+  def release_snapshot(
+    rev: String = "",
+    afp_rev: String = "",
+    parallel_jobs: Int = 1,
+    remote_mac: String = "")
+  {
+    Isabelle_System.with_tmp_dir("isadist")(base_dir =>
+      {
+        val new_snapshot = release_snapshot_dir.ext("new")
+        val old_snapshot = release_snapshot_dir.ext("old")
+
+        Isabelle_System.rm_tree(new_snapshot)
+        Isabelle_System.rm_tree(old_snapshot)
+
+        Build_Release.build_release(base_dir, rev = rev, afp_rev = afp_rev,
+          parallel_jobs = parallel_jobs, remote_mac = remote_mac, website = Some(new_snapshot))
+
+        if (release_snapshot_dir.is_dir) File.move(release_snapshot_dir, old_snapshot)
+        File.move(new_snapshot, release_snapshot_dir)
+        Isabelle_System.rm_tree(old_snapshot)
+      })
+  }
+
+
+  /* maintain build_log database */
+
+  def build_log_database(options: Options)
+  {
+    val store = Build_Log.store(options)
+    using(store.open_database())(db =>
+    {
+      store.update_database(db, log_dirs, ml_statistics = true)
+      store.snapshot_database(db, build_log_db)
+    })
+  }
+
+
+  /* present build status */
+
+  def build_status(options: Options)
+  {
+    val data = Build_Status.read_data(options)
+    Build_Status.present_data(data, target_dir = build_status_dir)
+  }
+}