Tiny Core Linux

Tiny Core Base => TCB Q&A Forum => Topic started by: GNUser on July 28, 2019, 10:19:45 PM

Title: how to achieve tc uid=1000 rather than uid=1001
Post by: GNUser on July 28, 2019, 10:19:45 PM

I have a partition with some personal files that various UNIX-like OSs need to access. All files in the partition have user:group ownership of 1000:1000.

My tc user is having permissions problems because its uid is 1001 and gid is 50. Is there a way to tell TC to use uid 1000 for user tc?

I already changed this line in /etc/init.d/tc-config:

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        /usr/sbin/adduser -s /bin/sh -G staff -D "$USER"
to

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        /usr/sbin/adduser -u 1000 -s /bin/sh -G staff -D "$USER"
and re-made core.gz, but even with the modified core.gz my tc user still ends up with uid=1001 for some reason.

Title: Re: how to achieve tc uid=1000 rather than uid=1001
Post by: GNUser on July 28, 2019, 10:39:24 PM

Oops, I just noticed that the addUser function in /etc/init.d/tc-config is only called if booting with user=foo where foo is other than tc. I also noticed that the /etc/passwd file in core.gz already has an entry for tc.

Therefore, I solved my problem by changing this line in /etc/passwd

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tc:x:1001:50:Linux User,,,:/home/tc:/bin/sh
to this

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tc:x:1000:50:Linux User,,,:/home/tc:/bin/sh
Solved  :)

P.S. If you need to modify your core.gz for some reason, here are the steps I used:

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# mkdir /tmp/dest
# cd /tmp/dest
# gunzip -c /path/to/core.gz | cpio -i
-> change /tmp/dest contents
# cd /tmp/dest
# find . | cpio -H newc -o | gzip -9 > ../core.gz-new


Title: Re: how to achieve tc uid=1000 rather than uid=1001
Post by: Rich on July 28, 2019, 10:47:43 PM

Hi GNUser
You could have also run:

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sudo /usr/sbin/adduser -u 1000 -s /bin/sh -G staff -D GNUserafter booting. Then logout and login as GNUser.

Title: Re: how to achieve tc uid=1000 rather than uid=1001
Post by: GNUser on July 28, 2019, 10:54:19 PM

Thanks, Rich. That's a nice alternative I hadn't thought of.

Title: Re: how to achieve tc uid=1000 rather than uid=1001
Post by: Rich on July 28, 2019, 11:04:59 PM

Hi GNUser
Yup, lots of ways to skin a cat problem in linux:

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sudo chown 1001:1001 *Access your files, then:

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sudo chown 1000:1000 *

Title: Re: how to achieve tc uid=1000 rather than uid=1001
Post by: GNUser on July 29, 2019, 08:27:02 AM

Quote from: Rich on July 28, 2019, 10:47:43 PM

You could have also run:

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sudo /usr/sbin/adduser -u 1000 -s /bin/sh -G staff -D GNUserafter booting. Then logout and login as GNUser.

I like this solution the best, as I want to avoid having to modify core.gz and want to avoid having to remember to change permissions before and after accessing the files.

Is there a way to automate the above (i.e., after booting, automatically run the command then automatically logout tc and login GNUser)?

Title: Re: how to achieve tc uid=1000 rather than uid=1001
Post by: Rich on July 29, 2019, 10:34:21 AM

Hi GNUser
Add the following to your  /opt/.filetool.lst  file:

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etc/group
etc/gshadow
etc/passwd
etc/shadow
etc/sudoersRun the  adduser  command and then run a backup. User  GNUser  will now be persistent.

Title: Re: how to achieve tc uid=1000 rather than uid=1001
Post by: GNUser on July 29, 2019, 02:29:56 PM

Wow, cool :o

Thank you, Richard. Indeed, there are so many ways to solve a problem using *nix tools... It's an embarrassment of riches.

Title: Re: how to achieve tc uid=1000 rather than uid=1001
Post by: GNUser on August 09, 2019, 05:56:52 PM

Today I discovered, quite by accident, that simply using user=gnuser boot code is enough: user gnuser is created with uid=1000. No need to manually create the user or backup any files. Thank you, Robert Shingledecker :)