grml2usb: replace mbrldr/mbrmgr with syslinux MBR

[mika]

The MirBSD-derived mbrldr/mbrmgr binaries offer no functional advantage over the syslinux MBR. Replace them with automatic syslinux MBR discovery (checking the same paths previously used by --syslinux-mbr), removing the need for a bundled MBR binary.

FTR:

• Remove mbr directory
• Always use syslinux MBR when bootloader is syslinux
• Remove ismirbsdmbr logic from install_mbr, always use the standard active partition flag (0x80)
• Deprecate --syslinux-mbr and --mbr-menu as no-ops with warnings to preserve backwards compatibility
• Update debian + tarball.sh files accordingly

NOTE: based on #98

[mika]

While looking into the MBR situation for #98, maybe it's time for this also?

[zeha]

I think more code can go away when doing this. Will look more closely later

[zeha]

  make[1]: Entering directory '/github/workspace'
  make -C clean
  make[2]: *** clean: No such file or directory.  Stop.
  make[2]: Entering directory '/github/workspace'
  make[1]: *** [Makefile:31: clean] Error 2
  make[2]: Leaving directory '/github/workspace'
  make[1]: Leaving directory '/github/workspace'
  dh_auto_clean: error: make -j4 clean returned exit code 2
  make: *** [debian/rules:9: clean] Error 25
  dpkg-buildpackage: error: debian/rules clean subprocess returned exit status 2

[github-actions]

📦 Built packages are ready! Download here.

[mika]

  make[1]: Entering directory '/github/workspace'
  make -C clean
  make[2]: *** clean: No such file or directory.  Stop.
  make[2]: Entering directory '/github/workspace'
  make[1]: *** [Makefile:31: clean] Error 2
  make[2]: Leaving directory '/github/workspace'
  make[1]: Leaving directory '/github/workspace'
  dh_auto_clean: error: make -j4 clean returned exit code 2
  make: *** [debian/rules:9: clean] Error 25
  dpkg-buildpackage: error: debian/rules clean subprocess returned exit status 2

Uh thanks and sorry, oversight from my side, fixed!

[github-actions]

📦 Built packages are ready! Download here.

[github-actions]

📦 Built packages are ready! Download here.

[zeha]

this should also go away i think:

debian/control
14: nasm,

[zeha]

grml2usb.8.adoc also still says this:

[IMPORTANT]
By default a compatible master boot record (MBR) is installed on the device
(being for example /dev/sdX when executing 'grml2usb grml.iso /dev/sdX1') and
syslinux is being used as default bootloader. Avoid installation of the default
MBR using the '--skip-mbr' option or if you encounter any problems with the
default MBR consider using '--syslinux-mbr' instead.

maybe addtl. doc updates are necessary, please check

[github-actions]

📦 Built packages are ready! Download here.

[mika]

grml2usb.8.adoc also still says this:

[IMPORTANT]
By default a compatible master boot record (MBR) is installed on the device
(being for example /dev/sdX when executing 'grml2usb grml.iso /dev/sdX1') and
syslinux is being used as default bootloader. Avoid installation of the default
MBR using the '--skip-mbr' option or if you encounter any problems with the
default MBR consider using '--syslinux-mbr' instead.

maybe addtl. doc updates are necessary, please check

ACK thanks, I noticed that grml2usb.8.adoc is outdated in several sections, needs even further work :-/

[zeha]

ACK thanks, I noticed that grml2usb.8.adoc is outdated in several sections, needs even further work :-/

right, lets see about mbr-stuff in this PR though

[zeha]

Please rebase on top of current master. Note that test_smoke tests only the defaults, thus now grub. Maybe we should extend the tests to cover syslinux, or ignore that?

[zeha]

Note that test_smoke tests only the defaults, thus now grub. Maybe we should extend the tests to cover syslinux, or ignore that?

I added an efi test in #103. Testing syslinux is for now impossible as the latest daily ISOs no longer contain the required syslinux files.