Add files via upload

upgrades/extras/upgrade_ubuntu_to_20.04/README.md

@@ -0,0 +1,19 @@
+```linux
+This script allows to upgrade dependencies in PNETLab UBUNTU 20.04
+
+File pnetlabv6_offline.zip will be downloaded from unetlab.cloud
+```
+## upgrade.sh
+`This script cannot be used in cases where PNETLab UBUNTU version is not 20.04: For those cases, an error message will be displayed and the script execution will be finished`
+
+### Upgrade
+Apply this command using the terminal
+```linux
+wget -O upgrade.sh https://raw.githubusercontent.com/pnetlabrepo/ishare2/main/upgrades/extras/upgrade_ubuntu_to_20.04/upgrade.sh > /dev/null 2>&1 && chmod +x upgrade.sh && bash upgrade.sh
+```
+
+When you run this command from above, the steps will be executed as follows:
+
+1) A file called [upgrade.sh](https://raw.githubusercontent.com/pnetlabrepo/ishare2/main/upgrades/extras/upgrade_ubuntu_to_20.04/upgrade.sh) will be downloaded from this repository
+2) Execution permissions will be applied to this file
+3) Finally, this script will be executed in order to make the upgrade

upgrades/extras/upgrade_ubuntu_to_20.04/upgrade.sh

@@ -0,0 +1,42 @@
+#!/bin/bash
+
+# Script designed to upgrade dependencies in PNETLab UBUNTU 20.04
+# Requirement: You need to have UBUNTU 20.04
+
+# CONSTANTS
+GREEN='\033[32m'
+RED='\033[31m'
+NO_COLOR='\033[0m'
+
+ZIP_FILENAME=pnetlabv6_offline.zip
+URL_ZIP_FILE=https://unetlab.cloud/api/raw/?path=/UNETLAB%20I/upgrades_pnetlab/extras/upgrade_to_ubuntu_20.04/pnetlabv6_offline.zip
+
+lsb_release -r -s | grep -q 20.04
+if [ $? -ne 0 ]; then
+    echo -e "${RED}Upgrade has been rejected. You need to have UBUNTU 20.04 to use this script${NO_COLOR}"
+    exit 0
+fi
+
+echo -e "${GREEN}Downloading $ZIP_FILENAME...${NO_COLOR}"
+wget --content-disposition -q --show-progress -O /tmp/$ZIP_FILENAME $URL_ZIP_FILE
+echo -e "${GREEN}$ZIP_FILENAME has been downloaded successfully${NO_COLOR}"
+
+cd /tmp && rm -rf upgrade
+
+echo -e "${GREEN}Unzipping zip file...${NO_COLOR}"
+unzip $ZIP_FILENAME -d ./upgrade > /dev/null 2>&1
+echo -e "${GREEN}Zip file has been unzipped successfully...${NO_COLOR}"
+
+chmod 755 -R upgrade
+find upgrade -type f -print0 | xargs -0 dos2unix > /dev/null 2>&1
+
+echo -e "${GREEN}Executing upgrade script...${NO_COLOR}"
+./upgrade/install_pnetlab_v6_offline.sh
+echo -e "${GREEN}Upgrade has been done successfully${NO_COLOR}"
+
+rm -rf upgrade
+rm /tmp/$ZIP_FILENAME
+
+echo -e "${GREEN}PNETLab VM will be rebooted right now...${NO_COLOR}"
+echo -e "${GREEN}Try to connect again in about a minute with these credentials: username=root password=pnet${NO_COLOR}"
+reboot