for creole's zephir2 branch

upgrade/pre_download/90-fill-apt-cache

@@ -0,0 +1,107 @@
+#!/bin/sh
+
+set -e
+
+ISO_DIR='/var/lib/eole/iso'
+
+ISO_IMAGE=$(ls -1 ${ISO_DIR}/*.iso 2>/dev/null || true)
+
+APT_CACHER_DIR='/var/cache/apt-cacher-ng'
+APT_DIR='/var/cache/apt/archives'
+
+MOUNT_POINT=
+
+## Called at the end of the file
+main() {
+    if [ $(echo "${ISO_IMAGE}" | wc -l) -gt 1 ]
+    then
+	die "more than one ISO image detected: ${ISO_IMAGE}"
+    fi
+
+    if [ -d "${APT_CACHER_DIR}" ]
+    then
+	populate_apt_cacher_cache
+    else
+	populate_apt_cache
+    fi
+}
+
+populate_apt_cache() {
+    MOUNT_POINT='/media/cdrom'
+    mount_iso "${ISO_IMAGE}" "${MOUNT_POINT}"
+
+    if find "${MOUNT_POINT}" -type f -name '*.deb' | xargs -I{} cp {} "${APT_DIR}"
+    then
+	echo "APT cache directory populated"
+    else
+	die "unablo to populate APT cache"
+    fi
+}
+
+populate_apt_cacher_cache() {
+
+    MOUNT_POINT="${APT_CACHER_DIR}/_import"
+    mount_iso "${ISO_IMAGE}" "${MOUNT_POINT}"
+    APT_CACHER_IMPORT_LOG=/tmp/apt-cacher-import.log
+    APT_CACHER_PORT=$(CreoleGet apt_cacher_port)
+
+    CURRENT_DISTRIB=$(lsb_release --codename --short)
+    NEXT_DISTRIB=$(awk '/^Suite:/ {print $2}' "${MOUNT_POINT}/dists/stable/Release")
+    TMP_SL=/tmp/next-apt-sources.list
+
+    # Build a temporary sources.list
+    # EOLE references are OK
+    cp /etc/apt/sources.list ${TMP_SL}
+    sed -i -e "s,${CURRENT_DISTRIB},${NEXT_DISTRIB}," ${TMP_SL}
+    
+    # Clean apt cache
+    rm -f /var/cache/apt/*cache.bin
+    rm -f /var/lib/apt/lists/*Packages
+    rm -f /var/lib/apt/lists/*Sources
+
+    apt-get -o Dir::Etc::SourceList=${TMP_SL} update
+
+    IMPORT_URL="http://localhost:${APT_CACHER_PORT}/acng-report.html?abortOnErrors=aOe&doImport=Start+Import&calcSize=cs&asNeeded=an"
+
+    ERROR_PATTERN='(No appropriate files found in the _import directory|color=red)'
+    wget -O "${APT_CACHER_IMPORT_LOG}" -q "${IMPORT_URL}"
+    ERRORS=$(sed -n -E "/${ERROR_PATTERN}/ s,<[^>]*>,,gp" "${APT_CACHER_IMPORT_LOG}")
+    if [ -n "${ERRORS}" ]
+    then
+	die "import log contains errors: ${ERRORS}"
+    else
+	echo "APT-CACHER cache populated"
+    fi
+}
+
+mount_iso() {
+    ISO="${1}"
+    MOUNT_POINT="$2"
+
+    [ -d "${MOUNT_POINT}" ] || mkdir "${MOUNT_POINT}"
+
+    if ! mount -o loop,ro "${ISO}" "${MOUNT_POINT}"
+    then
+	die "unable to mount “${ISO}”"
+    fi
+}
+
+die(){ echo 'Error:' $@ >&2; exit 1; }
+
+_clean() {
+    EXIT_CODE=$?
+
+    # Do not abort on failure as we are in SIGHANDLER
+    set +e
+
+    # Make script idempotent
+    umount "${MOUNT_POINT}" 2> /dev/null
+    rmdir "${MOUNT_POINT}" 2> /dev/null
+
+    # Use main script exit code
+    return ${EXIT_CODE}
+}
+
+trap _clean EXIT
+
+main $@