Install dependencies only if needed

scripts/run.sh

@@ -34,6 +34,70 @@ abort() {
     exit 1
 }
 
+echo "Checking and ensuring dependencies"
+check_dependencies() {
+    command -v whiptail >/dev/null 2>&1 || NEED_INSTALL+=("whiptail")
+    command -v seinfo >/dev/null 2>&1 || NEED_INSTALL+=("setools")
+    command -v lzip >/dev/null 2>&1 || NEED_INSTALL+=("lzip")
+    command -v wine64 >/dev/null 2>&1 || NEED_INSTALL+=("wine")
+    command -v winetricks >/dev/null 2>&1 || NEED_INSTALL+=("winetricks")
+    command -v patchelf >/dev/null 2>&1 || NEED_INSTALL+=("patchelf")
+    command -v resize2fs >/dev/null 2>&1 || NEED_INSTALL+=("e2fsprogs")
+    command -v pip >/dev/null 2>&1 || NEED_INSTALL+=("python3-pip")
+    command -v aria2c >/dev/null 2>&1 || NEED_INSTALL+=("aria2")
+}
+check_dependencies
+declare -A os_pm_install;
+# os_pm_install["/etc/redhat-release"]=yum
+# os_pm_install["/etc/arch-release"]=pacman
+# os_pm_install["/etc/gentoo-release"]=emerge
+# os_pm_install["/etc/SuSE-release"]=zypp
+os_pm_install["/etc/debian_version"]=apt-get
+# os_pm_install["/etc/alpine-release"]=apk
+
+declare -A PM_UPDATE_MAP;
+PM_UPDATE_MAP["yum"]="check-update"
+PM_UPDATE_MAP["pacman"]="-Syu --noconfirm"
+PM_UPDATE_MAP["emerge"]="-auDN @world"
+PM_UPDATE_MAP["zypp"]="update -y"
+PM_UPDATE_MAP["apt-get"]="update"
+PM_UPDATE_MAP["apk"]="update"
+
+declare -A PM_INSTALL_MAP;
+PM_INSTALL_MAP["yum"]="install -y"
+PM_INSTALL_MAP["pacman"]="-S --noconfirm --needed"
+PM_INSTALL_MAP["emerge"]="-a"
+PM_INSTALL_MAP["zypp"]="install -y"
+PM_INSTALL_MAP["apt-get"]="install -y"
+PM_INSTALL_MAP["apk"]="add"
+
+check_package_manager() {
+    for f in "${!os_pm_install[@]}"; do
+        if [[ -f $f ]]; then
+            PM="${os_pm_install[$f]}"
+            readarray -td ' ' UPDATE_OPTION <<<"${PM_UPDATE_MAP[$PM]} "; unset 'UPDATE_OPTION[-1]';
+            readarray -td ' ' INSTALL_OPTION <<<"${PM_INSTALL_MAP[$PM]} "; unset 'INSTALL_OPTION[-1]';
+            break
+        fi
+    done
+}
+
+check_package_manager
+if [ -n "${NEED_INSTALL[*]}" ]; then
+    if [ -z "$PM" ]; then
+        echo "Unable to determine package manager: unknown distribution"
+        exit 1
+    else
+        if ! sudo "$PM" "${UPDATE_OPTION[@]}" && sudo "$PM" "${INSTALL_OPTION[@]}" "${NEED_INSTALL[@]}"; then abort; fi
+    fi
+fi
+pip list --disable-pip-version-check | grep -E "^requests " >/dev/null 2>&1 || python3 -m pip install requests
+
+winetricks list-installed | grep -E "^msxml6" >/dev/null 2>&1 || {
+    cp -r ../wine/.cache/* ~/.cache
+    winetricks -q msxml6 || abort
+}
+
 function Radiolist {
     declare -A o="$1"
     shift
@@ -48,12 +112,6 @@ function YesNoBox {
     whiptail --title "${o[title]}" --yesno "${o[text]}" 0 0
 }
 
-echo "Dependencies"
-sudo apt update && sudo apt -y install setools lzip wine winetricks patchelf whiptail e2fsprogs python3-pip aria2
-python3 -m pip install requests
-cp -r ../wine/.cache/* ~/.cache
-winetricks msxml6 || abort
-
 ARCH=$(
     Radiolist '([title]="Build arch"
                 [default]="x64")' \