Erasing GPT backup header block, if expr is good enough
This commit is contained in:
parent
43d5804db3
commit
5a335e5594
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@ -15,7 +15,7 @@
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# announces.
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xdt_print_version() {
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echo "xorriso-dd-target , version 1.5.3 , 2020.01.06.204949"
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echo "xorriso-dd-target , version 1.5.3 , 2020.01.07.123808"
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}
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@ -225,6 +225,10 @@ xdt_reset_job() {
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xdt_sudo_cmd=
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xdt_have_su_power=
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xdt_end_after_setup=
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xdt_dev_bytes=
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xdt_dev_end=
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xdt_dd_bs="bs=1M"
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xdt_dd_silent=
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return 0
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}
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@ -350,7 +354,9 @@ xdt_arg_interpreter() {
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done
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xdt_predict_su_power || return "$?"
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# Prepare for using dd pacifier if desired and available
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# Prepare for using silent dd with GPT backup erasure if available
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xdt_dd_bs="bs=1M"
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xdt_dd_silent=
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if test -n "$xdt_dd_cmd"
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then
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if test -z "$xdt_no_pacifier" && \
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@ -359,6 +365,11 @@ xdt_arg_interpreter() {
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then
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xdt_dd_bs="bs=1M status=progress oflag=dsync"
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fi
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if "$xdt_dd_cmd" if=/dev/zero of=/dev/null count=1 bs=512 status=none \
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2>/dev/null
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then
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xdt_dd_silent="status=none"
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fi
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fi
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return 0
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}
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@ -615,8 +626,8 @@ xdt_list_devices() {
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# Optional tests for size
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if test -n "$xdt_max_size" || test -n "$xdt_min_size"
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then
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xdt_size=$("$xdt_lsblk_cmd" -n -b -o SIZE /dev/"$xdt_name" \
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| head -1 | xdt_round_down_div_million)
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xdt_dev_bytes=$("$xdt_lsblk_cmd" -n -b -o SIZE /dev/"$xdt_name" | head -1)
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xdt_size=$(echo "$xdt_dev_bytes" | xdt_round_down_div_million)
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if test -z "$xdt_size"
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then
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xdt_yucky=y
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@ -752,12 +763,37 @@ xdt_write_image() {
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echo "No executable program dd found in: $xdt_sudo_x_dir_list" >&2
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return 6
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fi
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# Erase possible GPT backup table at end of device
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# if expr can properly divide device size by 512
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if test -n "$xdt_dev_bytes"
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then
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xdt_dev_end=$(expr "$xdt_dev_bytes" / 512 2>/dev/null)
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if test "$(expr "$xdt_dev_end" '*' 512 2>/dev/null)" = "$xdt_dev_bytes"
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then
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xdt_dev_end=$(expr "$xdt_dev_end" - 1)
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else
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xdt_dev_end=
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fi
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fi
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xdt_gpt_erase_line="$xdt_sudo_cmd $xdt_dd_cmd if=/dev/zero of=/dev/'${2}' bs=512 seek='$xdt_dev_end' count=1 $xdt_dd_silent"
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xdt_copy_line="$xdt_sudo_cmd $xdt_dd_cmd if='${1}' of=/dev/'${2}' $xdt_dd_bs ; sync"
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if test -n "$xdt_dummy_run"
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then
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echo " $xdt_sudo_cmd $xdt_dd_cmd if='${1}' of=/dev/'${2}' $xdt_dd_bs ; sync"
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if test -n "$xdt_dev_end"
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then
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echo " $xdt_gpt_erase_line"
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fi
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echo " $xdt_copy_line"
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else
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echo "Performing:"
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echo " $xdt_sudo_cmd $xdt_dd_cmd if='${1}' of=/dev/'${2}' $xdt_dd_bs ; sync"
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if test -n "$xdt_dev_end"
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then
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echo " $xdt_gpt_erase_line"
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$xdt_sudo_cmd "$xdt_dd_cmd" if=/dev/zero of=/dev/"${2}" bs=512 seek="$xdt_dev_end" count=1 $xdt_dd_silent
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fi
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echo " $xdt_copy_line"
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$xdt_sudo_cmd "$xdt_dd_cmd" if="${1}" of=/dev/"${2}" $xdt_dd_bs
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xdt_ret="$?"
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sync
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@ -768,8 +804,6 @@ xdt_write_image() {
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fi
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fi
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# >>> ??? Erase possible GPT backup table at end of device ?
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if test -n "$xdt_dummy_force"
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then
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echo "BE SMART. BE CAUTIOUS. BEWARE."
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@ -9,7 +9,7 @@
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.\" First parameter, NAME, should be all caps
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.\" Second parameter, SECTION, should be 1-8, maybe w/ subsection
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.\" other parameters are allowed: see man(7), man(1)
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.TH XORRISO-DD-TARGET 1 "Version 1.5.3, Jan 6, 2020"
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.TH XORRISO-DD-TARGET 1 "Version 1.5.3, Jan 7, 2020"
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.\" Please adjust this date whenever revising the manpage.
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.\"
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.\" Some roff macros, for reference:
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@ -48,7 +48,7 @@ If a single plausible candidate is detected, then the program is willing to
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copy a disk image file onto it. This will overwrite or make inaccessible the
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previous partition table and all previous data content of the target device.
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.br
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\fBSuperuser power\fR is normally needed for filesystem type identification,
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\fBSuperuser power\fR is often needed for filesystem type identification,
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for possible unmounting, and for possible image writing.
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Option \fB\-with_sudo\fR offers a way to gain this power only for those
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tasks and to run the program elsewise with a normal user's power.
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@ -173,13 +173,14 @@ sdc : NO : usb+ no_fs_while_not_su\-
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Option \fB\-plug_test\fR triggers an interactive method to unambiguously
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determine the intended target device candidate. It consists of 2 or 3 steps.
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.br
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\fBStep 1\fR is to have the intended storage device unplugged and
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\fBStep 1\fR is to have the intended storage device \fBunplugged\fR and
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to confirm this by pressing the Enter key at the program's prompt. The program
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will then assess the list of not wanted devices.
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.br
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\fBStep 2\fR is to plug in the intended storage device and to confirm this
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by pressing the Enter key a second time. The program will wait up to 10 seconds
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for a disk\-like storage device which is not in the list of not wanted devices.
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\fBStep 2\fR is to \fBplug in\fR the intended storage device and to
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confirm this by pressing the Enter key a second time. The program will wait
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up to 10 seconds for a disk\-like storage device which is not in the list of
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not wanted devices.
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The user may wait with key pressing until the device blinking looks like it
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is ready.
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.br
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@ -270,9 +271,18 @@ Unmounted: /dev/sde2
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.br
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Performing:
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.br
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sudo /bin/dd if='debian\-live\-10.0.0\-amd64\-xfce.iso' of=/dev/sde bs=1M status=progress oflag=dsync ; sync
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sudo /bin/dd if=/dev/zero of=/dev/'sde' bs=512 seek='245759999'
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.br
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count=1 status=none
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.br
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sudo /bin/dd if='debian\-live\-10.0.0\-amd64\-xfce.iso' of=/dev/'sde'
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.br
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bs=1M status=progress oflag=dsync ; sync
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.br
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... dd messages ...
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.br
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The first dd run shall erase a possible GPT backup header. It is performed only
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if the local program "expr" can deal with the byte size of the device.
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.SS
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\fBShow commands for writing to a not advised device:\fR
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.br
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@ -326,7 +336,13 @@ AGAINST THE ADVICE BY THIS PROGRAM, a daring user could do:
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.br
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sudo /bin/umount /dev/sdd3
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.br
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sudo /bin/dd if='debian\-live\-10.0.0\-amd64\-xfce.iso' of=/dev/sdd bs=1M status=progress oflag=dsync ; sync
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sudo /bin/dd if=/dev/zero of=/dev/'sdd' bs=512 seek='7864318'
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.br
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count=1 status=none
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.br
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sudo /bin/dd if='debian\-live\-10.0.0\-amd64\-xfce.iso' of=/dev/sdd
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.br
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bs=1M status=progress oflag=dsync ; sync
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.br
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BE SMART. BE CAUTIOUS. BEWARE.
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.SS
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@ -538,7 +554,7 @@ Thomas Schmitt <scdbackup@gmx.net>
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.br
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for libburnia\-project.org
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.SH COPYRIGHT
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Copyright (c) 2019 Thomas Schmitt
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Copyright (c) 2019 \- 2020 Thomas Schmitt
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.br
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Permission is granted to distribute this text freely. It shall only be
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modified in sync with the technical properties of xorriso\-dd\-target.
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@ -50,7 +50,7 @@ If a single plausible candidate is detected, then the program is willing
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to copy a disk image file onto it. This will overwrite or make
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inaccessible the previous partition table and all previous data content
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of the target device.
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*Superuser power* is normally needed for filesystem type identification,
|
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*Superuser power* is often needed for filesystem type identification,
|
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for possible unmounting, and for possible image writing. Option
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*-with_sudo* offers a way to gain this power only for those tasks and to
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run the program elsewise with a normal user's power.
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@ -157,10 +157,10 @@ File: xorriso-dd-target.info, Node: Plugtest, Next: Dowrite, Prev: Givendevic
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Option *-plug_test* triggers an interactive method to unambiguously
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determine the intended target device candidate. It consists of 2 or 3
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steps.
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*Step 1* is to have the intended storage device unplugged and to confirm
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this by pressing the Enter key at the program's prompt. The program
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will then assess the list of not wanted devices.
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*Step 2* is to plug in the intended storage device and to confirm this
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*Step 1* is to have the intended storage device *unplugged* and to
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confirm this by pressing the Enter key at the program's prompt. The
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program will then assess the list of not wanted devices.
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*Step 2* is to *plug in* the intended storage device and to confirm this
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by pressing the Enter key a second time. The program will wait up to 10
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seconds for a disk-like storage device which is not in the list of not
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wanted devices. The user may wait with key pressing until the device
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@ -224,9 +224,14 @@ Looking for mount points of sde:
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Unmounted: /dev/sde1
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Unmounted: /dev/sde2
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Performing:
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sudo /bin/dd if='debian-live-10.0.0-amd64-xfce.iso' of=/dev/sde bs=1M
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status=progress oflag=dsync ; sync
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sudo /bin/dd if=/dev/zero of=/dev/'sde' bs=512 seek='245759999'
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count=1 status=none
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sudo /bin/dd if='debian-live-10.0.0-amd64-xfce.iso' of=/dev/'sde'
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bs=1M status=progress oflag=dsync ; sync
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... dd messages ...
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The first dd run shall erase a possible GPT backup header. It is
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performed only if the local program "expr" can deal with the byte size
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of the device.
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File: xorriso-dd-target.info, Node: Unwise, Next: Reasons, Prev: Dowrite, Up: Overview
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@ -263,8 +268,10 @@ AGAINST THE ADVICE BY THIS PROGRAM, a daring user could do:
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sudo /bin/umount /dev/sdd1
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sudo /bin/umount /dev/sdd2
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sudo /bin/umount /dev/sdd3
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sudo /bin/dd if='debian-live-10.0.0-amd64-xfce.iso' of=/dev/sdd bs=1M
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status=progress oflag=dsync ; sync
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sudo /bin/dd if=/dev/zero of=/dev/'sdd' bs=512 seek='7864318'
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count=1 status=none
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sudo /bin/dd if='debian-live-10.0.0-amd64-xfce.iso' of=/dev/sdd
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bs=1M status=progress oflag=dsync ; sync
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BE SMART. BE CAUTIOUS. BEWARE.
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@ -462,7 +469,7 @@ for libburnia-project.org
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14.2 Copyright
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==============
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Copyright (c) 2019 Thomas Schmitt
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Copyright (c) 2019 - 2020 Thomas Schmitt
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Permission is granted to distribute this text freely. It shall only be
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modified in sync with the technical properties of xorriso-dd-target. If
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you make use of the license to derive modified versions of
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@ -541,20 +548,20 @@ File: xorriso-dd-target.info, Node: ConceptIdx, Next: Top, Prev: CommandIdx,
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Tag Table:
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Node: Top429
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Node: Overview996
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Node: Simplenames2792
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Node: Listall3516
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Node: Givendevices5089
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Node: Plugtest6053
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Node: Dowrite7954
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Node: Unwise9097
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Node: Reasons10637
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Node: Options13218
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Node: Examples16315
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Node: Files16488
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Node: Seealso16646
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Node: Bugreport16812
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Node: Legal17399
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Node: CommandIdx18103
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Node: ConceptIdx19369
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Node: Simplenames2789
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Node: Listall3513
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Node: Givendevices5086
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Node: Plugtest6050
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Node: Dowrite7955
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Node: Unwise9336
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Node: Reasons10958
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Node: Options13539
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Node: Examples16636
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Node: Files16809
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Node: Seealso16967
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Node: Bugreport17133
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Node: Legal17720
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Node: CommandIdx18431
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Node: ConceptIdx19697
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End Tag Table
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|
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@ -50,7 +50,7 @@
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@c man .\" First parameter, NAME, should be all caps
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@c man .\" Second parameter, SECTION, should be 1-8, maybe w/ subsection
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@c man .\" other parameters are allowed: see man(7), man(1)
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@c man .TH XORRISO-DD-TARGET 1 "Version 1.5.3, Jan 6, 2020"
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@c man .TH XORRISO-DD-TARGET 1 "Version 1.5.3, Jan 7, 2020"
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@c man .\" Please adjust this date whenever revising the manpage.
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@c man .\"
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@c man .\" Some roff macros, for reference:
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@ -128,7 +128,7 @@ If a single plausible candidate is detected, then the program is willing to
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copy a disk image file onto it. This will overwrite or make inaccessible the
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previous partition table and all previous data content of the target device.
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@*
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@strong{Superuser power} is normally needed for filesystem type identification,
|
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@strong{Superuser power} is often needed for filesystem type identification,
|
||||
for possible unmounting, and for possible image writing.
|
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Option @strong{-with_sudo} offers a way to gain this power only for those
|
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tasks and to run the program elsewise with a normal user's power.
|
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|
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@ -275,13 +275,14 @@ sdc : NO : usb+ no_fs_while_not_su-
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Option @strong{-plug_test} triggers an interactive method to unambiguously
|
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determine the intended target device candidate. It consists of 2 or 3 steps.
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@*
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@strong{Step 1} is to have the intended storage device unplugged and
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@strong{Step 1} is to have the intended storage device @strong{unplugged} and
|
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to confirm this by pressing the Enter key at the program's prompt. The program
|
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will then assess the list of not wanted devices.
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@*
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@strong{Step 2} is to plug in the intended storage device and to confirm this
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by pressing the Enter key a second time. The program will wait up to 10 seconds
|
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for a disk-like storage device which is not in the list of not wanted devices.
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@strong{Step 2} is to @strong{plug in} the intended storage device and to
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confirm this by pressing the Enter key a second time. The program will wait
|
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up to 10 seconds for a disk-like storage device which is not in the list of
|
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not wanted devices.
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The user may wait with key pressing until the device blinking looks like it
|
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is ready.
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@*
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@ -375,9 +376,18 @@ Unmounted: /dev/sde2
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@*
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Performing:
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@*
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sudo /bin/dd if='debian-live-10.0.0-amd64-xfce.iso' of=/dev/sde bs=1M status=progress oflag=dsync ; sync
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sudo /bin/dd if=/dev/zero of=/dev/'sde' bs=512 seek='245759999'
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@*
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count=1 status=none
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@*
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sudo /bin/dd if='debian-live-10.0.0-amd64-xfce.iso' of=/dev/'sde'
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@*
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bs=1M status=progress oflag=dsync ; sync
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@*
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... dd messages ...
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@*
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The first dd run shall erase a possible GPT backup header. It is performed only
|
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if the local program "expr" can deal with the byte size of the device.
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@c man .SS
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@node Unwise, Reasons, Dowrite, Overview
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@chapter Show commands for writing to a not advised device
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@ -434,7 +444,13 @@ AGAINST THE ADVICE BY THIS PROGRAM, a daring user could do:
|
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@*
|
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sudo /bin/umount /dev/sdd3
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@*
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sudo /bin/dd if='debian-live-10.0.0-amd64-xfce.iso' of=/dev/sdd bs=1M status=progress oflag=dsync ; sync
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sudo /bin/dd if=/dev/zero of=/dev/'sdd' bs=512 seek='7864318'
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@*
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count=1 status=none
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@*
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sudo /bin/dd if='debian-live-10.0.0-amd64-xfce.iso' of=/dev/sdd
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@*
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bs=1M status=progress oflag=dsync ; sync
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@*
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BE SMART. BE CAUTIOUS. BEWARE.
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@c man .SS
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@ -704,7 +720,7 @@ Thomas Schmitt <scdbackup@@gmx.net>
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for libburnia-project.org
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@c man .SH COPYRIGHT
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@section Copyright
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Copyright (c) 2019 Thomas Schmitt
|
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Copyright (c) 2019 - 2020 Thomas Schmitt
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||||
@*
|
||||
Permission is granted to distribute this text freely. It shall only be
|
||||
modified in sync with the technical properties of xorriso-dd-target.
|
||||
|
|
|
|||
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