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| \/ | \ \ / / | __ \ (_) | | / ____| | | | |
| \ / |_ __\ V / | |__) | __ ___ ____ _| |_ ___ | (___ | |__ ___| | |
| |\/| | '__|> < | ___/ '__| \ \ / / _` | __/ _ \ \___ \| '_ \ / _ \ | |
| | | | |_ / . \ | | | | | |\ V / (_| | || __/ ____) | | | | __/ | |
|_| |_|_(_)_/ \_\ |_| |_| |_| \_/ \__,_|\__\___| |_____/|_| |_|\___V 2.1
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# Nothing to do here when GRUB2 is specified to be used as USB bootloader:
test "$USB_BOOTLOADER" = "grub" && return
# Test for features in dd
# true if dd supports oflag= option
FEATURE_DD_OFLAG=
dd_version=$( get_version dd --version )
version_newer "$dd_version" 5.3.0 && FEATURE_DD_OFLAG="y"
# We assume REAL_USB_DEVICE and RAW_USB_DEVICE are both set by prep/USB/Linux-i386/350_check_usb_disk.sh
[ "$RAW_USB_DEVICE" -a "$REAL_USB_DEVICE" ] || BugError "RAW_USB_DEVICE and REAL_USB_DEVICE are not both set"
# Check if syslinux needs to be updated:
usb_syslinux_version=$( get_usb_syslinux_version )
syslinux_version=$( get_syslinux_version )
if [[ "$usb_syslinux_version" ]] && version_newer "$usb_syslinux_version" "$syslinux_version" ; then
DebugPrint "No need to update syslinux on $RAW_USB_DEVICE that has version $usb_syslinux_version"
return
fi
LogPrint "Making $RAW_USB_DEVICE bootable with syslinux/extlinux"
# When RAW_USB_DEVICE is e.g. /dev/sdb
# then REAL_USB_DEVICE is the data partition /dev/sdb1 when there in no boot partition or /dev/sdb2 when there is a boot partition which is /dev/sdb1
# and USB_DEVICE is e.g. /dev/disk/by-label/REAR-000 (from BACKUP_URL=usb:///dev/disk/by-label/REAR-000) which is also the data partition
# but here we need the filesystem where the booting related files are which are on the data partition or on the boot partition if exists
# and that filesystem was mounted by output/default/100_mount_output_path.sh at $BUILD_DIR/outputfs which is shown in /proc/mounts like
# /dev/sdb1 /var/tmp/rear.XXXXXXXXXXXXXXX/outputfs ext2 rw,noatime 0 0
# so we search for " $BUILD_DIR/outputfs " in /proc/mounts to get the filesystem (third field) where the booting related files are:
usb_filesystem=$( grep " $BUILD_DIR/outputfs " /proc/mounts | cut -d' ' -f3 | tail -1 )
case "$usb_filesystem" in
# Since SYSLINUX version 4.00 extlinux also works for a mounted vfat boot partition
# because https://wiki.archlinux.org/title/syslinux reads (excerpts):
# For FAT, ext2/3/4, or btrfs boot partition use extlinux, where the device has been mounted:
# # extlinux --install ...
# Alternatively, for a FAT boot partition use syslinux, where the device is unmounted
# and see https://wiki.syslinux.org/wiki/index.php?title=EXTLINUX that reads (excerpt):
# EXTLINUX supports:
# [3.00+] ext2/3,
# [4.00+] FAT12/16/32, ext2/3/4, Btrfs,
# [4.06+] FAT12/16/32, NTFS, ext2/3/4, Btrfs,
# [5.01+] FAT12/16/32, NTFS, ext2/3/4, Btrfs, XFS,
# [6.03+] FAT12/16/32, NTFS, ext2/3/4, Btrfs, XFS, UFS/FFS
# and see https://wiki.syslinux.org/wiki/index.php?title=Syslinux_4_Changelog that reads (excerpts):
# Changes in 4.00
# ...
# EXTLINUX is no longer a separate derivative;
# extlinux and syslinux both install the same loader (ldlinux.sys);
# for the Linux-based installers the extlinux binary is used for a mounted filesystem;
# the syslinux binary for an unmounted filesystem.
# See https://github.com/rear/rear/issues/2884
# and https://github.com/rear/rear/pull/2904
(ext?|vfat)
if [[ "$FEATURE_SYSLINUX_EXTLINUX_INSTALL" ]] ; then
extlinux -i "$BUILD_DIR/outputfs/$SYSLINUX_PREFIX" || Error "'extlinux -i $BUILD_DIR/outputfs/$SYSLINUX_PREFIX' failed"
else
extlinux "$BUILD_DIR/outputfs/$SYSLINUX_PREFIX" || Error "'extlinux $BUILD_DIR/outputfs/$SYSLINUX_PREFIX' failed"
fi
;;
("")
LogPrintError "Could not find a filesystem in /proc/mounts for $BUILD_DIR/outputfs"
Error "An ext2/3/4 or vfat filesystem must be mounted for the booting related files on $RAW_USB_DEVICE"
;;
(*)
LogPrintError "Only ext2/3/4 and vfat are supported for the booting related files on $RAW_USB_DEVICE"
Error "Unsupported filesystem $usb_filesystem is mounted at $BUILD_DIR/outputfs"
;;
esac
if [ "$REAL_USB_DEVICE" != "$RAW_USB_DEVICE" ] ; then
# Write the USB boot sector if the filesystem is not the entire disk:
LogPrint "Writing syslinux MBR $SYSLINUX_MBR_BIN of type $USB_DEVICE_PARTED_LABEL to $RAW_USB_DEVICE"
if [[ "$FEATURE_DD_OFLAG" ]] ; then
dd if=$SYSLINUX_MBR_BIN of=$RAW_USB_DEVICE bs=440 count=1 oflag=sync || Error "Failed to write syslinux MBR to $RAW_USB_DEVICE"
else
dd if=$SYSLINUX_MBR_BIN of=$RAW_USB_DEVICE bs=440 count=1 || Error "Writing syslinux MBR to $RAW_USB_DEVICE failed"
sync
fi
else
LogPrintError "Not writing syslinux MBR to $RAW_USB_DEVICE so it may not be bootable"
fi