Make install scripts more portable

[mmuman]

Most linuxisms used in the install scripts can likely be replaced by more portable code, or be done in a way that allows porting to other platforms (BSD, Haiku…).

We probably want to clean them up first though (#199).

[grahamperrin]

# date ; uname -v
Mon May  3 20:11:27 BST 2021
FreeBSD 14.0-CURRENT #93 main-n246330-5eb9c93a20d: Tue Apr 27 05:14:26 BST 2021     root@mowa219-gjp4-8570p:/usr/obj/usr/src/amd64.amd64/sys/GENERIC-NODEBUG 
# pwd
/usr/home/grahamperrin/Desktop/ventoy-1.0.42
# ./Ventoy2Disk.sh -i /dev/da0

**********************************************
      Ventoy: 1.0.42  x86_64
      longpanda admin@ventoy.net
      https://www.ventoy.net
**********************************************

Failed to access /dev/da0, maybe root privilege is needed!

# whoami
root
# 

[probonopd]

Tried to build the Qt GUI on FreeBSD. No luck because #include <linux/fs.h> doesn't exist on FreeBSD:

FreeBSD% wget https://github.com/ventoy/Ventoy/archive/refs/heads/master.zip

FreeBSD% unzip master.zip

FreeBSD% cd Ventoy-master/LinuxGUI/Ventoy2Disk/QT

FreeBSD% qmake-qt5

FreeBSD% ln -s ../* .  

FreeBSD% make        
clang -c -pipe -O2 -Wall -Wextra -pthread -fPIC -DQT_DEPRECATED_WARNINGS -DSTATIC=static -DINIT= -DQT_NO_DEBUG -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_CORE_LIB -I. -I/home/panda/Ventoy2Disk/Core -I/home/panda/Ventoy2Disk/Web -I/home/panda/Ventoy2Disk/QT -I/home/panda/Ventoy2Disk/Include -I/home/panda/Ventoy2Disk/Lib/libhttp/include -I/home/panda/Ventoy2Disk/Lib/fat_io_lib/include -I/home/panda/Ventoy2Disk/Lib/xz-embedded/linux/include -I/home/panda/Ventoy2Disk/Lib/xz-embedded/linux/include/linux -I/home/panda/Ventoy2Disk/Lib/xz-embedded/userspace -I/home/panda/Ventoy2Disk/Lib/exfat/src/libexfat -I/home/panda/Ventoy2Disk/Lib/fat_io_lib -I/usr/local/include/qt5 -I/usr/local/include/qt5/QtWidgets -I/usr/local/include/qt5/QtGui -I/usr/local/include/qt5/QtCore -I. -I/usr/local/include -I. -I/usr/local/include -I/usr/local/lib/qt5/mkspecs/freebsd-clang -o ventoy_crc32.o Core/ventoy_crc32.c
clang -c -pipe -O2 -Wall -Wextra -pthread -fPIC -DQT_DEPRECATED_WARNINGS -DSTATIC=static -DINIT= -DQT_NO_DEBUG -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_CORE_LIB -I. -I/home/panda/Ventoy2Disk/Core -I/home/panda/Ventoy2Disk/Web -I/home/panda/Ventoy2Disk/QT -I/home/panda/Ventoy2Disk/Include -I/home/panda/Ventoy2Disk/Lib/libhttp/include -I/home/panda/Ventoy2Disk/Lib/fat_io_lib/include -I/home/panda/Ventoy2Disk/Lib/xz-embedded/linux/include -I/home/panda/Ventoy2Disk/Lib/xz-embedded/linux/include/linux -I/home/panda/Ventoy2Disk/Lib/xz-embedded/userspace -I/home/panda/Ventoy2Disk/Lib/exfat/src/libexfat -I/home/panda/Ventoy2Disk/Lib/fat_io_lib -I/usr/local/include/qt5 -I/usr/local/include/qt5/QtWidgets -I/usr/local/include/qt5/QtGui -I/usr/local/include/qt5/QtCore -I. -I/usr/local/include -I. -I/usr/local/include -I/usr/local/lib/qt5/mkspecs/freebsd-clang -o ventoy_disk.o Core/ventoy_disk.c
Core/ventoy_disk.c:31:10: fatal error: 'linux/fs.h' file not found
#include <linux/fs.h>
         ^~~~~~~~~~~~
1 error generated.                                                                               
*** Error code 1

Stop.
make: stopped in /tmp/Ventoy-master/LinuxGUI/Ventoy2Disk/QT

[probonopd]

Until the Ventoy installation scripts and Qt GUI supports FreeBSD, FreeBSD users can use the Ventoy Live ISO.

For the FreeBSD friends out there, I added Ventoy support to the Create Live Media utility in helloSystem:

[hurzl]

Can the iso update itself when booted by ventoy?

[probonopd]

The Live medium can be used to install Ventoy to another drive. When you want a new version, you can download a new version of the Live ISO, overwrite the Live medium with it, and use it to update the Ventoy installation on the other drive while keeping your ISO collection.

[hurzl]

Can the iso update itself when booted by ventoy?

yes it worked.