Merge "Auto-update ISO_URL"

labs/osbash/lib/osbash/functions-host.sh

@@ -442,8 +442,8 @@ function download {
         fi
     fi
     if [ $rc -ne 0 ]; then
-        echo -e >&2 "${CError:-}Unable to download ${CData:-}$url${CError:-}, quitting.${CReset:-}"
-        exit 1
+        echo -e >&2 "${CError:-}Unable to download ${CData:-}$url${CError:-}.${CReset:-}"
+        return 1
     fi
 }
 
@@ -451,11 +451,34 @@ function get_iso_name {
     basename "${ISO_URL:-}"
 }
 
-function find_install-iso {
-    local iso_name=$1
+# If ISO image is missing from IMG_DIR, try downloading it.
+function download_iso_if_necessary {
+    local iso_name=$(get_iso_name)
     if [ ! -f "$ISO_DIR/$iso_name" ]; then
-        echo >&2 "$iso_name not in $ISO_DIR; downloading"
-        download "$ISO_URL" "$ISO_DIR" "$iso_name"
+        echo >&2 "$iso_name not in $ISO_DIR; downloading."
+        if ! download "$ISO_URL" "$ISO_DIR" "$iso_name"; then
+            echo -e >&2 "${CError:-}Download failed.${CReset:-}"
+            # Remove empty file
+            rm "$ISO_DIR/$iso_name"
+            return 1
+        fi
+    else
+        echo >&2 "$iso_name already in $ISO_DIR."
+    fi
+}
+
+# Get ISO image for installation. If the download fails, get an alternative URL
+# and try again.
+function find_install-iso {
+    if ! download_iso_if_necessary; then
+        # No local ISO file and download failed
+        echo -e >&2 "${CStatus:-}Trying to find alternative.${CReset:-}"
+        update_iso_variables
+
+        if ! download_iso_if_necessary; then
+            echo -e >&2 "${CError:-}Exiting.${CReset:-}"
+            exit 1
+        fi
     fi
 }
 

labs/osbash/lib/osbash/lib.ubuntu-14.04-server-amd64

@@ -7,8 +7,10 @@
 # Booting the operating system installer
 #-------------------------------------------------------------------------------
 
-readonly ISO_URL=http://releases.ubuntu.com/14.04/ubuntu-14.04.3-server-amd64.iso
-readonly ISO_MD5=9e5fecc94b3925bededed0fdca1bd417
+readonly ISO_URL_BASE=http://releases.ubuntu.com/14.04/
+
+ISO_URL=$ISO_URL_BASE/ubuntu-14.04.3-server-amd64.iso
+ISO_MD5=9e5fecc94b3925bededed0fdca1bd417
 
 readonly _PS_ssh=http://git.openstack.org/cgit/openstack/training-labs/plain/labs/osbash/lib/osbash/netboot/preseed-ssh-v2.cfg
 readonly _PS_vbadd=http://git.openstack.org/cgit/openstack/training-labs/plain/labs/osbash/lib/osbash/netboot/preseed-vbadd.cfg
@@ -27,6 +29,26 @@ readonly _BOOT_ARGS="/install/vmlinuz
     initrd=/install/initrd.gz
     console-setup/ask_detect=false"
 
+# Fallback function to find current ISO image in case the file in ISO_URL is
+# neither on the disk nor at the configured URL.
+# This mechanism was added because old Ubuntu ISOs are removed from the server
+# as soon as a new ISO appears.
+function update_iso_variables {
+    # Get matching line from distro repo's MD5SUMS file, e.g.
+    # "9e5fecc94b3925bededed0fdca1bd417 *ubuntu-14.04.3-server-amd64.iso"
+    local distro_info=$(wget -O - $ISO_URL_BASE/MD5SUMS|grep server-amd64)
+
+    # First part (removing everything after first space) is the md5sum
+    ISO_MD5=${distro_info%% *}
+
+    # Second part (keeping everything after ' *') is the ISO file name
+    local iso_file=${distro_info#* \*}
+
+    ISO_URL=$ISO_URL_BASE/$iso_file
+
+    echo -e >&2 "${CStatus:-}New ISO_URL: ${CData:-}$ISO_URL${CReset:-}"
+}
+
 function vbox_distro_start_installer {
     local vm_name=$1
 

labs/osbash/lib/osbash/virtualbox-install_base.sh

@@ -17,15 +17,15 @@ function vm_install_base {
     vm_mem "$vm_name" "${VM_BASE_MEM:=512}"
 
     if [ -z "${INSTALL_ISO-}" ]; then
-        local iso_name=$(get_iso_name)
 
-        if [  -z "$iso_name" ]; then
+        if [  -z "$ISO_URL" ]; then
             echo -e >&2 "${CMissing:-}Either ISO URL or name needed (ISO_URL, INSTALL_ISO).${CReset:-}"
             exit 1
         fi
-        INSTALL_ISO=$ISO_DIR/$iso_name
         # Don't look for ISO image if we are only doing wbatch
-        ${OSBASH:-:} find_install-iso "$iso_name"
+        ${OSBASH:-:} find_install-iso
+
+        INSTALL_ISO=$ISO_DIR/$(get_iso_name)
     fi
 
     echo >&2 -e "${CInfo:-}Install ISO:\n\t${CData:-}$INSTALL_ISO${CReset:-}"