unsquashfs and then mksquashfs break SSH

Post#1 by **link08** » 05 Dec 2017, 02:45

I need to modify 003-settings.xzm, because I need to modify /opt/porteus-scripts/gui-app to change my browser behaviour. I also have module 08-ssh.xzm in my porteus kiosk ISO. After I mksquashfs 003-settings.xzm file and create porteus kiosk ISO again - SSH module stop working. At first I thought that my modifications of /opt/porteus-scripts/gui-app is the cause of the problem. However I unsquashfs>squashfs 003-settings.xzm file WITHOUT any modifications and SSH module stop working. When I try to use port scaner on port 22 on porteus kiosk it shows that port is open, but not listening. I use instructions from http://porteus-kiosk.org/modules.html so they are not correct.
I would appreciate ASAP answers on question since I need to prepare the project today or tomorrow.

Post#2 by **link08** » 06 Dec 2017, 11:57

possible solution will be use dir2xzm instead of using mksquashfs from squashfs-tools.

stanis · Post#3 by **stanis** » 01 Jun 2018, 13:46

Hi, i have the same problem: unsquash->edit->squash(or without edit). Iso is built correctly, but then no ssh.
is dir2xzm working for you? If so where did you got it from.
I am quite confused on where to find it.
Can you throw me a tip?

Thank you.

Post#4 by **fanthom** » 02 Jun 2018, 07:35

Hi stanis,

Please provide output of 'mksquashfs' command on your system.

Post#5 by **Funtik** » 19 Mar 2019, 08:35

Similar problem. After manual assembly according to the instructions, SSH stops working. I edit the installation image and collect it in the latest version of CentOS 7.

Post#6 by **fanthom** » 19 Mar 2019, 08:46

I'll repeat:

"Please provide output of 'mksquashfs' command on your system."

Post#7 by **Funtik** » 19 Mar 2019, 09:12

OK. As I will be at the workplace, I will check and sign off here. Now I am reading the forum threads in order to better understand the principle of your program. Accidentally discovered a similar situation and decided to write.

Post#8 by **Funtik** » 24 Mar 2019, 19:35

Today, a new image assembled. Now I connect via SSH without any problems. The only thing I don’t know is what helped — assigning root rights: root to all directories except the GUEST directory, or what the firewall left on during the installation (before that I turned off the firewall).

The only thing that is not convenient is that for each connection on the SSH server for some reason uses different keys.

Post#9 by **bonzo** » 29 Aug 2019, 06:19

I also had this problem. I.e changed 08-ssh.xzm and then couldn't ssh into the kiosk pc.
What I found was that the permissions on /var/empty had changed. This dir must be owned by root and have 744 permissions.
When you extract the files as a normal user, the original ownership / permissions are lost. Extracting and packing as root will avoid this problem.

i.e. extract

Code: Select all

apt install squashfs-tools
sudo unsquashfs 08-ssh.xzm

compress

Code: Select all

sudo mksquashfs squashfs-root local-settings.xzm -comp xz -b 256K -Xbcj x86 -noappend

Post#10 by **fanthom** » 29 Aug 2019, 06:28

Great - thank you for sharing!