-boot-info-table
Specifies that a 56-byte table with information of the CD-ROM
layout will be patched in at offset 8 in the boot file. If this
option is given, the boot file is modified in the source
filesystem, so make a copy of this file if it cannot be easily
regenerated! See the EL TORITO BOOT INFO TABLE section for a
description of this table.
As this parameter seems to be rather ubiquitous in the context of pre-specified distro ISO build commandlines, could someone elaborate on what the implications might be for an ISO generated without calling -boot-info-table at build time (in both CD/DVD and flash media endpoint contexts)?
@Corona688:
Sounds like a clever workaround! Thanks for adding to the discussion
For those of us who might not be familiar with this niche, what would an implementation of a unionfs mountup look like in this scenario?
Thanks again, all; and have a great day.
Last edited by LinQ; 11-19-2014 at 01:34 PM..
Reason: Clarification . . .
From the manpages (genisoimage, mkisofs):As this parameter seems to be rather ubiquitous in the context of pre-specified distro ISO build commandlines, could someone elaborate on what the implications might be for an ISO generated without calling -boot-info-table at build time (in both CD/DVD and flash media endpoint contexts)?
Hi LinQ,
without calling boot-info-table results
we need to go to as root code for some points. let us examine.
isolinux.asm
Example of Boot Information Table. (starts at offset 8 and is 56 bytes long.) now lets look at the our mounts.
-------------------------- lets try to check.
-----------------
without modify table and original iso checksums are seem same.
but modificated iso's boot image is seem different.because we modified it.
lets try to find differents.
it says in 13.bytes differs for files and its below. so we can see the just first lines (bytes) in the images.for see the boot-table..
* original and without_boot isos boot table's are same because of we change the boot-file from original iso in when creating the without_boot iso.
* with boot and without boot isos boot table differs in the 13.byte(s). and if i m not point to wrong offset it was for BootFileLocation.(12-16 nr. bytes for saving lba of boot file/image location) . because of we want to re-genarate the boot-table with new values with boot-info-table option.(but it seems there are just one change)
lets remember this.
so we want to modify boot-table (with -boot-info-table) values and LBA of the Boot File (as addresssing to CD-ROM image in) was changed..it is all. lets look at the more preview.
( first read the boot-info-table and then gets primary volume descriptor address after gets information from the primary volume descriptor )
we already gets the lba boot table values from hexdump. (see above)
-----------------------------------------------------------------------------------------
86 hex = 134 dec (lba boot image) --> original iso (cdrom)
87 hex = 135 dec (lba boot image) --> new iso's values (with_boot and without_boot)
-----------------------------------------------------------------------------------------
at the sametime we check it from isoinfo via primary volume descriptor (like ext fs superblock --> more details in cdfs-iso-primary.html)
i see the boot image locations from above outputs in there new iso boot image's lba values are same and little differ from the original iso.
probably mkisofs/genisoimage located its (and others iso fs specs) to default values (pre-defined in the mkisofs/genisoimage ) of iso filesystem while creating new iso and therefore there is a little change.
finally only change seems this and to me it must not be problem for boot process while system boot.
and i tested all isos in the vm enviroment and all of them are worked success without any warning or exception.
Hello.
System : opensuse leap 42.3
I have a bash script that build a text file.
I would like the last command doing :
print_cmd -o page-left=43 -o page-right=22 -o page-top=28 -o page-bottom=43 -o font=LatinModernMono12:regular:9 some_file.txt
where :
print_cmd ::= some printing... (1 Reply)
Hi everybody,
I am new at Unix/Bourne shell scripting and with my youngest experiences, I will not become very old with it :o
My code:
#!/bin/sh
set -e
set -u
export IFS=
optl="Optl"
LOCSTORCLI="/opt/lsi/storcli/storcli"
($LOCSTORCLI /c0 /vall show | grep RAID | cut -d " "... (5 Replies)
Greetings!
Looking to clear up a rather simple matter which seems to nonetheless elude me: How does one call Perl's s2p from the commandline? I've tried such as this:perl -e s2p '-i 's/first/last/g' ./somefile.txt'...to convert a similarly-formed GNU sedline over to the Perl equivalent (without... (2 Replies)
How to use "mailx" command to do e-mail reading the input file containing email address, where column 1 has name and column 2 containing “To” e-mail address
and column 3 contains “cc” e-mail address to include with same email.
Sample input file, email.txt
Below is an sample code where... (2 Replies)
I want to print any matching IP addresse in List1 with List 2;
List 1
List of IP addresses;
161.85.58.210
250.57.15.129
217.23.162.249
74.76.129.101
30.221.177.237
3.147.200.59
170.58.142.64
127.65.109.33
150.167.242.146
223.3.20.186
25.181.180.99
2.55.199.32 (3 Replies)
Hi,
Could anyone please shed some light on the following script lines and what is it doing as it was written by an ex-administrator?
cat $AMS/version|read a b verno d
DBVer=$(/usr/bin/printf "%7s" $verno)
I checked that the cat $AMS/version command returns following output:
... (10 Replies)
Hi,
I have line in input file as below:
3G_CENTRAL;INDONESIA_(M)_TELKOMSEL;SPECIAL_WORLD_GRP_7_FA_2_TELKOMSEL
My expected output for line in the file must be :
"1-Radon1-cMOC_deg"|"LDIndex"|"3G_CENTRAL|INDONESIA_(M)_TELKOMSEL"|LAST|"SPECIAL_WORLD_GRP_7_FA_2_TELKOMSEL"
Can someone... (7 Replies)
Hallo,
i need a Prompting read in my script:
read -p "Enter your command: " command
But i always get this Error:
-p: is not an identifier
When I run these in c-shell i get this error
/usr/bin/read: read: bad option(s)
How can I use a Prompt in the read command? (9 Replies)
Hi Friends,
Can any of you explain me about the below line of code?
mn_code=`env|grep "..mn"|awk -F"=" '{print $2}'`
Im not able to understand, what exactly it is doing :confused:
Any help would be useful for me.
Lokesha (4 Replies)
Dears,
I've written a script which allows me to send mails in different formats with different attaches. Now I still want to add a feature to this script. My users would like to be able to receive a "read" or "delivered" receipt for their mails.
The script send mails on behalve of an specific... (1 Reply)