base-installer

@@ -48,4 +48,11 @@ else
         log "trusted.gpg already exists under /etc/apt in target"
 fi
 
+# Unlike apt-get, apt removes debs from the cache once installed successfully.
+# Keep them to benefit (again) from cached debs for LTSP chroot installation.
+log "adding /etc/apt/apt.conf.d/01keep-pkgs to speed up LTSP installation."
+cat > /target/etc/apt/apt.conf.d/01keep-pkgs <<EOF
+Binary::apt::APT::Keep-Downloaded-Packages "true";
+EOF
+
 disable_exception

debian/changelog

 debian-edu-install (2.10.13) UNRELEASED; urgency=medium
 
+  [ Holger Levsen ]
   * Bump standards version to 4.2.1, no changes needed.
 
+  [ Wolfgang Schweer ]
+  * Re-enable the use of already downloaded packages to speed up LTSP chroot
+    installation:
+    - base-installer: Add temporary apt configuration (don't clean apt cache);
+      it is removed during finish-install (via d-e-c).
+    - debian/debian-edu-profile-udeb.postinst: Prevent pkgsel from running
+      'apt-get clean'; the cache is cleaned anyway at the very end of the
+      installation.
+
  -- Holger Levsen <holger@debian.org>  Mon, 27 Aug 2018 12:05:04 +0200
 
 debian-edu-install (2.10.12) unstable; urgency=medium

debian/debian-edu-profile-udeb.postinst

@@ -7,8 +7,11 @@ set -e
 # Get rid of setting DEBIAN_TASKS_ONLY (introduced by pkgsel-udeb 0.45)
 # to allow the installation of education tasks in the target chroot,
 # where this setting is evaluated (since tasksel 3.39).
+# Don't run 'apt-get clean', keep packages for LTSP chroot installation; this
+# command will be run later (at the very end of the installation).
 if [ -e /var/lib/dpkg/info/pkgsel.postinst ] ; then
-    sed -i s/DEBIAN_TASKS_ONLY=1// /var/lib/dpkg/info/pkgsel.postinst
+    sed -i s/DEBIAN_TASKS_ONLY=1// /var/lib/dpkg/info/pkgsel.postinst;
+    sed -i '/apt-get clean/d' /var/lib/dpkg/info/pkgsel.postinst
 fi
 
 # Ask about which profile to install.