Installer rewrite -> bash (fix #49)

The installer, now in bash

PVEDiscordDark.sh

@@ -0,0 +1,227 @@
+#!/bin/bash
+# https://github.com/Weilbyte/PVEDiscordDark
+
+#region Consts
+RED='\033[0;31m'
+BRED='\033[0;31m\033[1m'
+GRN='\033[92m'
+WARN='\033[93m'
+BOLD='\033[1m'
+REG='\033[0m'
+CHECKMARK='\033[0;32m\xE2\x9C\x94\033[0m'
+
+TEMPLATE_FILE="/usr/share/pve-manager/index.html.tpl"
+SCRIPTPATH="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)/$(basename "${BASH_SOURCE[0]}")"
+
+REPO=${REPO:-"Weilbyte/PVEDiscordDark"}
+DEFAULT_TAG="master"
+TAG=${TAG:-$DEFAULT_TAG}
+BASE_URL="https://raw.githubusercontent.com/$REPO/$TAG"
+#endregion Consts
+
+#region Prerun checks
+hash sed 2>/dev/null || { 
+    echo -e >&2 "${BRED}sed is required but missing from your system${REG}";
+    exit 1;
+}
+
+hash curl 2>/dev/null || { 
+    echo -e >&2 "${BRED}cURL is required but missing from your system${REG}";
+    exit 1;
+}
+
+hash pveversion 2>/dev/null || { 
+    echo -e >&2 "${BRED}PVE installation required but missing from your system${REG}";
+    exit 1;
+}
+
+curl -sSf -f https://github.com/robots.txt &> /dev/null || {
+    echo -e >&2 "${BRED}Could not establish a connection to GitHub (github.com)${REG}";
+    exit 1;
+}
+
+if [ $TAG != $DEFAULT_TAG ]; then
+    if !([[ $TAG =~ [0-9] ]] && [ ${#TAG} -ge 7 ] && (! [[ $TAG =~ ['!@#$%^&*()_+.'] ]]) ); then 
+        echo -e "${WARN}It appears like you are using a non-default tag. For security purposes, please use the SHA-1 hash of said tag instead${REG}"
+    fi
+fi
+#endregion Prerun checks
+
+PVEVersion=$(pveversion --verbose | grep pve-manager | cut -c 14- | cut -c -6) # Below pveversion pre-run check
+PVEVersionMajor=$(echo $PVEVersion | cut -d'-' -f1)
+
+#region Helper functions
+function checkSupported {   
+    local SUPPORTED=$(curl -f -s "$BASE_URL/meta/supported")
+    if [ -z "$SUPPORTED" ]; then 
+        echo -e "${WARN}Could not reach supported version file ($BASE_URL/meta/supported). Skipping support check.${REG}"
+    else 
+        local SUPPORTEDARR=($(echo "$SUPPORTED" | tr ',' '\n'))
+        if ! (printf '%s\n' "${SUPPORTEDARR[@]}" | grep -q -P "$PVEVersionMajor"); then
+            echo -e "${WARN}You might encounter issues because your version ($PVEVersionMajor) is not matching currently supported versions ($SUPPORTED)."
+            echo -e "If you do run into any issues on >newer< versions, please consider opening an issue at https://github.com/Weilbyte/PVEDiscordDark/issues.${REG}"
+        fi
+    fi
+}
+
+function isInstalled {
+    if (grep -Fq "<link rel='stylesheet' type='text/css' href='/pve2/css/dd_style.css'>" $TEMPLATE_FILE ||
+        grep -Fq "<script type='text/javascript' src='/pve2/js/dd_patcher.js'></script>" $TEMPLATE_FILE ||
+        [ -f "/usr/share/pve-manager/css/dd_style.css" ] ); then 
+        true
+    else 
+        false
+    fi
+}
+
+#endregion Helper functions
+
+#region Main functions
+function usage {
+    if [ "$_silent" = false ]; then
+        echo -e "Usage: $0 [OPTIONS...] {COMMAND}\n"
+        echo -e "Manages the PVEDiscordDark theme."
+        echo -e "  -h --help            Show this help"
+        echo -e "  -s --silent          Silent mode\n"
+        echo -e "Commands:"
+        echo -e "  status               Check current theme status (in silent mode, returns 0 if installed, and 1 if not installed)"
+        echo -e "  install              Install the theme"
+        echo -e "  uninstall            Uninstall the theme"
+        echo -e "  update               Update the theme (runs uninstall, then install)"
+        echo -e "  utility-update       Update this utility\n"
+        echo -e "Exit status:"
+        echo -e "  0                    OK"
+        echo -e "  1                    Failure"
+        echo -e "  2                    Already installed, OR not installed (when using install/uninstall commands)\n"
+        echo -e "Report issues at: <https://github.com/Weilbyte/PVEDiscordDark/issues>"
+    fi
+}
+
+function status {
+    if [ "$_silent" = false ]; then
+        echo -e "Theme"
+        if isInstalled; then
+            echo -e "  Status:      ${GRN}present${REG}"
+        else
+            echo -e "  Status:      ${RED}not present${REG}"
+        fi
+        echo -e "  CSS:         $(sha256sum /usr/share/pve-manager/css/dd_style.css 2>/dev/null  || echo N/A)"
+        echo -e "  JS:          $(sha256sum /usr/share/pve-manager/js/dd_patcher.js 2>/dev/null  || echo N/A)\n"
+        echo -e "PVE"
+        echo -e "  Version:     $PVEVersion (major $PVEVersionMajor)\n"
+        echo -e "Utility hash:  $(sha256sum $SCRIPTPATH 2>/dev/null  || echo N/A)"
+        exit 0
+    else 
+        if isInstalled; then exit 0; else exit 1; fi
+    fi
+}
+
+function install {
+    if isInstalled; then
+        if [ "$_silent" = false ]; then echo -e "${RED}Theme already installed${REG}"; fi
+        exit 2
+    else
+        if [ "$_silent" = false ]; then checkSupported; fi
+
+        if [ "$_silent" = false ]; then echo -e "${CHECKMARK} Backing up template file"; fi
+        cp $TEMPLATE_FILE $TEMPLATE_FILE.bak
+
+        if [ "$_silent" = false ]; then echo -e "${CHECKMARK} Downloading stylesheet"; fi
+        curl -s $BASE_URL/PVEDiscordDark/sass/PVEDiscordDark.css > /usr/share/pve-manager/css/dd_style.css
+
+        if [ "$_silent" = false ]; then echo -e "${CHECKMARK} Downloading patcher"; fi
+        curl -s $BASE_URL/PVEDiscordDark/js/PVEDiscordDark.js > /usr/share/pve-manager/js/dd_patcher.js
+
+        if [ "$_silent" = false ]; then echo -e "${CHECKMARK} Applying changes to template file"; fi
+        echo "<link rel='stylesheet' type='text/css' href='/pve2/css/dd_style.css'>" >> $TEMPLATE_FILE
+        echo "<script type='text/javascript' src='/pve2/js/dd_patcher.js'></script>" >> $TEMPLATE_FILE
+
+        local IMAGELIST=$(curl -f -s "$BASE_URL/meta/imagelist")
+        local IMAGELISTARR=($(echo "$IMAGELIST" | tr ',' '\n'))
+        if [ "$_silent" = false ]; then echo -e "Downloading images (0/${#IMAGELISTARR[@]})"; fi
+        ITER=0
+        for image in "${IMAGELISTARR[@]}"
+        do
+                curl -s $BASE_URL/PVEDiscordDark/images/$image > /usr/share/pve-manager/images/$image
+                ((ITER++))
+                if [ "$_silent" = false ]; then echo -e "\e[1A\e[KDownloading images ($ITER/${#IMAGELISTARR[@]})"; fi
+        done
+        if [ "$_silent" = false ]; then echo -e "\e[1A\e[K${CHECKMARK} Downloading images (${#IMAGELISTARR[@]}/${#IMAGELISTARR[@]})"; fi
+
+        if [ "$_silent" = false ]; then echo -e "Theme installed."; fi
+        exit 0
+    fi
+}
+
+function uninstall {
+    if ! isInstalled; then
+        echo -e "${RED}Theme not installed${REG}"
+        exit 2
+    else
+        if [ "$_silent" = false ]; then echo -e "${CHECKMARK} Removing stylesheet"; fi
+        rm /usr/share/pve-manager/css/dd_style.css
+
+        if [ "$_silent" = false ]; then echo -e "${CHECKMARK} Removing patcher"; fi
+        rm /usr/share/pve-manager/js/dd_patcher.js
+
+        if [ "$_silent" = false ]; then echo -e "${CHECKMARK} Reverting changes to template file"; fi
+        sed -i "/<link rel='stylesheet' type='text\/css' href='\/pve2\/css\/dd_style.css'>/d" /usr/share/pve-manager/index.html.tpl
+        sed -i "/<script type='text\/javascript' src='\/pve2\/js\/dd_patcher.js'><\/script>/d" /usr/share/pve-manager/index.html.tpl
+
+        if [ "$_silent" = false ]; then echo -e "${CHECKMARK} Removing images"; fi
+        rm /usr/share/pve-manager/images/dd_*
+
+        if [ "$_silent" = false ]; then echo -e "Theme uninstalled."; fi
+        exit 0
+    fi
+}
+
+#endregion Main functions
+
+_silent=false
+_command=false
+
+parse_cli()
+{
+	while test $# -gt -0
+	do
+		_key="$1"
+		case "$_key" in
+			-h|--help)
+				usage
+				exit 0
+				;;
+            -s|--silent)
+                _silent=true
+                ;;
+            status) 
+                if [ "$_command" = false ]; then
+                    _command=true
+                    status
+                fi
+                ;;
+            install) 
+                if [ "$_command" = false ]; then
+                    _command=true
+                    install
+                    exit 0
+                fi
+                ;;
+            uninstall)
+                if [ "$_command" = false ]; then
+                    _command=true
+                    uninstall
+                    exit 0
+                fi
+                ;;
+			*)
+				echo -e "${BRED}Error: Got an unexpected argument \"$_key\"${REG}\n"; 
+                usage;
+                exit 1;
+				;;
+		esac
+		shift
+	done
+}
+
+parse_cli "$@"