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mistfire
Joined: 04 Nov 2008 Posts: 1272 Location: PH
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Posted: Fri 14 Jun 2019, 20:12 Post subject:
Sanderdog 1.5: load and use other linux distro in puppy Subject description: chrooted underdog |
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Since underdog linux is retired. I think of a new approach based from chroot approach.
It works like an underdog but chrooted compared to mount at bottom layer. This script allows to load the other linux distro partition on the fly and use its application (even older linux distro versions) with desktop integration and file association without breaking the system
It has gui looks like the former underdog gui.
The chrooted environment only sees the host /root, /home, /mnt, and /media. Everyone is welcome to improve this program. Icon integration is the only missing piece.
How sanderdog works:
1. It will create a directory named /var/vfs
2. The target linux partition will be mounted at /var/vfs/ro_layer
3. Add some flag file at /var/vfs/rw_layer
4. mount /var/vfs/ro_layer, /var/vfs/rw_layer, at /var/vfs/rootfs
5. The /dev, /root, /proc, /sys, /home, /media, /tmp, and /mnt will be bind mounted at /var/vfs/rootfs
6. Generate chrooted desktop files at /usr/share/applications
7. Copy some mime xml files from /var/vfs/ro_layer to /usr/share/mime
8. Start some services (supports systemd, upstart, runit, and sysvinit [experimental])
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Description |
* Now supports starting sysvinit services (experimental) * Added arch compatibility matching
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Download |
Filename |
sanderdog-1.5.pet |
Filesize |
5.93 KB |
Downloaded |
159 Time(s) |
Last edited by mistfire on Tue 16 Jul 2019, 03:51; edited 14 times in total
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wiak
Joined: 11 Dec 2007 Posts: 1842 Location: not Bulgaria
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Posted: Sat 15 Jun 2019, 05:52 Post subject:
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I think suggestion is the same (or very similar, except for your planning to mount proc etc in middle layer) as being done in FirstRib leading to one version of WeeDog:
http://www.murga-linux.com/puppy/viewtopic.php?p=1029315#1029315
http://murga-linux.com/puppy/viewtopic.php?p=1025462#1025462
http://murga-linux.com/puppy/viewtopic.php?p=1027227#1027227
http://www.murga-linux.com/puppy/viewtopic.php?p=1030336#1030336
Having said that, FirstRib is being developed to test out both the above chroot overlay (preferred) or aufs fs methods but also more traditional initramfs switch_root (and perhaps also pivot_root with chroot) type boots.
Your middle layer would have to be a read/write layer of course, for proc etc, so maybe only possible with aufs? As far as I remember, but would have to re-read kernel notes on overlayfs, result is undefined according to specs of overlayfs if middle layer used as read/write?).
Looking forward to your own trials/test-code though, since the more code examples and developments like this the better!
wiak
EDIT: By the way, in English, chunder means to vomit, so maybe not the best name...
_________________ Tiny Linux Blog: http://www.tinylinux.info/
Check Firmware: www.murga-linux.com/puppy/viewtopic.php?p=1022797
tinycore/slitaz: http://www.murga-linux.com/puppy/viewtopic.php?p=990130#990130
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Terry H
Joined: 29 Mar 2009 Posts: 674 Location: The Heart of Muskoka, ON Canada
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Posted: Sat 15 Jun 2019, 09:47 Post subject:
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wiak wrote: |
EDIT: By the way, in English, chunder means to vomit, so maybe not the best name...  |
I had quite a chuckle when I read the title. In the words of Men at Work, immortalized in song:
"I come from a land down under where beer does flow and men chunder".
So now having had a laugh, i congratulate both of you for your many contributions and innovations to puppy. Your contributions are very much appreciated.
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s243a
Joined: 02 Sep 2014 Posts: 2199
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Posted: Sat 15 Jun 2019, 11:31 Post subject:
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I look forward to seeing how chunderdog works. It sounds interesting . On another note I don't think that underdog should be retired. If you happen do do a woof-CE fork that keeps underdog, please let us know .
_________________ Find me on minds and on pearltrees.
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mistfire
Joined: 04 Nov 2008 Posts: 1272 Location: PH
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Posted: Mon 17 Jun 2019, 10:12 Post subject:
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Update:
It works but here are some observations
1. Binded mountpoints /dev, /sys, /proc, and /tmp does not appear on top layer when mounted on middle layer. It requires to bind mount on top layer
2. Chrooted rootfs can see host /root, /media, and /mnt by mount binding on top layer
3. Auto generation of chrooted desktop files works but need to deal with Icons.
@s243a underdog was removed from woof-ce github. So an alternative solution is needed.
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s243a
Joined: 02 Sep 2014 Posts: 2199
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Posted: Mon 17 Jun 2019, 10:25 Post subject:
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mistfire wrote: | Update:
It works but here are some observations
1. Binded mountpoints /dev, /sys, /proc, and /tmp does not appear on top layer when mounted on middle layer. It requires to bind mount on top layer
2. Chrooted rootfs can see host /root, /media, and /mnt by mount binding on top layer
3. Auto generation of chrooted desktop files works but need to deal with Icons.
@s243a underdog was removed from woof-ce github. So an alternative solution is needed. |
Unless you want to maintain a separate fork of alternatively unless it is possible to provide underdog as a pet.
That all said perhaps the chunderdog idea is superior and none of these above two alternatives are necessary. I look forward to seeing how this progresses
_________________ Find me on minds and on pearltrees.
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mistfire
Joined: 04 Nov 2008 Posts: 1272 Location: PH
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Posted: Tue 18 Jun 2019, 00:43 Post subject:
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Here is a simple chunderdog demo that I made
How to use this script:
1. Puppy host
2. You need an installed linux distro on a partition
3. Type this command on terminal
Code: | ./chunderdog.sh [target linux partition] |
4. It will enter chrooted shell, minimize the terminal
5. You will now see the additional applications came from other linux distro on Applications Menu. Also the underdog apps have file association too (for xdg-compliant file managers)
6. To quit the demo. Restore the minimized terminal and type "exit"
Also I need help to implement the following on chunderdog
1. Make /var/vfs/ro_layer/usr/share/icons and /var/vfs/ro_layer/usr/share/mime visible on host
2. Run services/daemons from chrooted underdog and stop them also upon exiting chrooted underdog
Description |
Initial demo script
* Just remove .zip extension and set file permission to +x
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Download |
Filename |
chunderdog.sh.zip |
Filesize |
3.04 KB |
Downloaded |
120 Time(s) |
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mistfire
Joined: 04 Nov 2008 Posts: 1272 Location: PH
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Posted: Tue 25 Jun 2019, 02:59 Post subject:
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chunderdog is now called sanderdog (sandboxed underdog).
The pet package is attached at the first post of this thread
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mistfire
Joined: 04 Nov 2008 Posts: 1272 Location: PH
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Posted: Wed 26 Jun 2019, 06:19 Post subject:
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Sanderdog-1.1 released
Changes:
* Improved chrooting
* Improved gui
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mistfire
Joined: 04 Nov 2008 Posts: 1272 Location: PH
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Posted: Wed 26 Jun 2019, 18:55 Post subject:
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Take note, the chrooted application has (isolated) suffix on its name.
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01101001b

Joined: 08 Mar 2017 Posts: 92 Location: Buenos Aires, Argentina
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Posted: Tue 02 Jul 2019, 03:56 Post subject:
Re: sanderdog 1.1: load and use other linux distro partition in puppy Subject description: chrooted underdog |
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mistfire wrote: | [...]How sanderdog works:[...] | Mistfire, this is inmensely useful to me. I've tried and failed several attempts with underdog in the past and the present. Now I'll try this as soon as possible.
Thank you!
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mistfire
Joined: 04 Nov 2008 Posts: 1272 Location: PH
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Posted: Thu 04 Jul 2019, 06:55 Post subject:
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Sanderdog 1.2 released
Changes:
* More improvements
* Able to start some systemd service and autostart
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mistfire
Joined: 04 Nov 2008 Posts: 1272 Location: PH
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Posted: Fri 05 Jul 2019, 02:36 Post subject:
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Sanderdog 1.3 released
Changes:
* Aside some systemd services, it can now start upstart services
* More bugfixes
Download link was on the first post of this thread
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mistfire
Joined: 04 Nov 2008 Posts: 1272 Location: PH
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Posted: Thu 11 Jul 2019, 08:30 Post subject:
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Sanderdog 1.4 released
Changes:
* Added support for starting some runit services
* Failsafe added. Sanderdog will not run if 32-bit host attempts to load 64-bit linux distro
Download was on the first post of this thread
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rockedge

Joined: 11 Apr 2012 Posts: 1348 Location: Connecticut, United States
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Posted: Thu 11 Jul 2019, 09:55 Post subject:
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I have been having success with firstrib (WeeDog) in various forms from a boot version to a chroot'ed one. The chroot'ed version of firstrib really works well with a Puppy Linux Bionic as host.
So I am going to give this script a try as this looks interesting and a potential approach to a LAMP system I am messing with.
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