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| author |   Eric Hameleers <alien@slackware.com> | 2020-06-25 19:14:50 +0200 |
|---|---|---|
| committer | Eric Hameleers <alien@slackware.com> | 2020-06-25 19:14:50 +0200 |
| commit | 864930baf17782129b43dad6f28648cbb73853c6 (patch) | |
| tree | e13cc48e5f8597084fde776f6c470a2910d4c917 | |
| parent | 82b052cd169533953c7983e1999168a26d777d09 (diff) | |
| download | liveslak-864930baf17782129b43dad6f28648cbb73853c6.tar.gz liveslak-864930baf17782129b43dad6f28648cbb73853c6.tar.xz | |
iso2usb.sh: really wipe the drive first
When a Live ISO is first copied to a USB drive using 'cp' or 'dd' and
next you use iso2usb.sh to remake the USB drive into a persistent Live OS,
traces of the old ISO9660 filesystem will remain and this confuses grub
when you boot on a UEFI computer.
So we will additionally use 'wipefs' to erase traces of filesystems.
In the help text, make it clear that '-c' and '-C' accept only integer numbers
for sizes and percentages. This is caused by a bash limitation in arithmetics.
| -rw-r--r-- | iso2usb.sh | 14 |
1 files changed, 10 insertions, 4 deletions
@@ -80,7 +80,7 @@ DOLUKS=0 REFRESH=0 # These tools are required by the script, we will check for their existence: -REQTOOLS="blkid cpio extlinux fdisk gdisk isoinfo lsblk mkdosfs sgdisk syslinux" +REQTOOLS="blkid cpio extlinux fdisk gdisk isoinfo lsblk mkdosfs sgdisk syslinux wipefs" # Path to syslinux files: if [ -d /usr/share/syslinux ]; then @@ -156,8 +156,9 @@ cat <<EOT # $(basename $0) accepts the following parameters: # -c|--crypt size|perc Add LUKS encrypted /home ; parameter is the # requested size of the container in kB, MB, GB, -# or as a percentage of free space. -# Examples: '-c 125M', '-c 1.3G', '-c 20%'. +# or as a percentage of free space +# (integer numbers only). +# Examples: '-c 125M', '-c 2G', '-c 20%'. # -d|--devices List removable devices on this computer. # -f|--force Ignore most warnings (except the back-out). # -h|--help This help. @@ -182,7 +183,9 @@ cat <<EOT # free space for a custom 4th partition'. # -C|--cryptpersistfile size|perc # Use a LUKS-encrypted 'persistence' file instead -# of a directory (for use on FAT filesystem). +# of a directory (for use on FAT filesystem) +# Format for size/percentage is the same +# as for the '-c' parameter. # -P|--persistfile Use a 'persistence' container file instead of # a directory (for use on FAT filesystem). # @@ -638,7 +641,10 @@ if [ $REFRESH -eq 0 ]; then # Make sure that there is no MBR nor a partition table anymore: dd if=/dev/zero of=$TARGET bs=512 count=1 conv=notrunc + # We have to use wipefs before sgdisk or else traces of an old 'cp' or 'dd' + # of a Live ISO image to the device will not be erased. # The sgdisk wipe command is allowed to have non-zero exit code: + wipefs -af $TARGET sgdisk -og $TARGET || true # After the wipe, get the value of the last usable sector: |