[SOLVED] Set not-hard-coded quota during user creation

l0f4r0 · 07-17-2019, 03:51 AM

Is it possible to insert shell commands inside text configuration files for variable initialization?

Indeed, I'm wondering because the example below doesn't work (my custom command is taken as plain text):

Quote:

Originally Posted by /etc/adduser.conf

QUOTAUSER=$(sort -t":" -k3 /etc/passwd | awk 'BEGIN{FS=":"} $3>=1000{print $1}' | head -1)

The output after executing adduser titi.tutu is the following:

Code:

Setting quota for user `titi.tutu' to values of user `$(sort -t":" -k3 /etc/passwd | awk 'BEGIN{FS=":"} $3>=1000{print $1}' | head -1)' ...
edquota: user $(sort -t":" -k3 /etc/passwd | awk 'BEGIN{FS=":"} $3>=1000{print $1}' | head -1) does not exist.
adduser: `/usr/sbin/edquota -p $(sort -t":" -k3 /etc/passwd | awk 'BEGIN{FS=":"} $3>=1000{print $1}' | head -1) titi.tutu' returned error code 1. Exiting.

Upon consideration, I am not sure it can be done because my config file is not even executable...
So, if true, how would you achieve my goal please (retrieve the quota of first user having uid>=1000 and use it to set quota of the new user upon creation)?

Thank you

berndbausch · 07-17-2019, 04:01 AM

Quote:

Originally Posted by l0f4r0

Is it possible to insert shell commands inside text configuration files for variable initialization?

This could work if the config file in question were interpreted so that shell commands are executed. This is the case, for example, with the RHEL and SUSE network configuration files under /etc/sysconfig, but I would guess that the large majority of all config files are not interpreted.

Even if it is possible, it's probably not supported and not recommended for security reasons.

Turbocapitalist · 07-17-2019, 04:03 AM

You'll want to look in the configuration file for adduser, /etc/adduser.conf and in there you will find a line for quotas. See "man adduser.conf"

Supposedly there is also an option for adduser to run a custom script, but I'm not finding it. However, QUOTAUSER in /etc/adduser.conf will likely get the quota assignment done.

l0f4r0 · 07-17-2019, 04:15 AM

Quote:

Originally Posted by Turbocapitalist

You'll want to look in the configuration file for adduser, /etc/adduser.conf and in there you will find a line for quotas. See "man adduser.conf"
[...]However, QUOTAUSER in /etc/adduser.conf will likely get the quota assignment done.

If you recheck my OP, you'll notice that I've already used the QUOTAUSER variable inside /etc/adduser.conf

However, I don't want to assign it to a static value but to a dynamic one, hence this post...

Quote:

Originally Posted by Turbocapitalist

Supposedly there is also an option for adduser to run a custom script, but I'm not finding it.

This is probably what I'm looking for. Does it ring a bell to somebody please?

Turbocapitalist · 07-17-2019, 04:23 AM

Quote:

Originally Posted by l0f4r0

If you recheck my OP, you'll notice that I've already used the QUOTAUSER variable inside /etc/adduser.conf

Sorry, I should be more clear. It's an indirect reference. You can have your script set the quota for the template user from which the quota is copied and then, after that, call adduser with its QUOTAUSER reference.

l0f4r0 · 07-17-2019, 07:27 AM

Quote:

Originally Posted by Turbocapitalist

Sorry, I should be more clear. It's an indirect reference. You can have your script set the quota for the template user from which the quota is copied and then, after that, call adduser with its QUOTAUSER reference.

You mean the following?
- set a quota for a "reference" user: edquota -u myReferenceUser
- specify in my /etc/adduser.conf: QUOTAUSER=myReferenceUser

If so, I've already done it. It works but it's not what I want because it's static/hard-coded and I might get into trouble should myReferenceUser be deleted some time later. That's why I would like to run a command to retrieve at least one curent user on the system.

Turbocapitalist · 07-17-2019, 08:06 AM

Create an extra account which will exist only for the purpose of setting a quota. Then set /etc/adduser.conf: QUOTAUSER=myReferenceUser and leave it. Then in your script, set the quota for myReferenceUser just prior to calling adduser.

Though if there is a way to find the missing documentation about triggering a script from adduser that would be less convoluted.

Edit: from "man adduser"

Quote:

If the file /usr/local/sbin/adduser.local exists, it will be executed
after the user account has been set up in order to do any local setup.
The arguments passed to adduser.local are:
username uid gid home-directory
The environment variable VERBOSE is set according to the following
rule:
...

l0f4r0 · 07-18-2019, 04:48 AM

Quote:

Originally Posted by Turbocapitalist

Though if there is a way to find the missing documentation about triggering a script from adduser that would be less convoluted.

Edit: from "man adduser":
If the file /usr/local/sbin/adduser.local exists, it will be executed
after the user account has been set up in order to do any local setup.
The arguments passed to adduser.local are:
username uid gid home-directory
The environment variable VERBOSE is set according to the following
rule:
...

Excellent, it did the job perfectly.
Thank you Turbocapitalist!
Post [SOLVED]

Quote:

Originally Posted by /usr/local/sbin/adduser.local

#!/bin/sh
username="$1"
uid="$2"
gid="$3"
home="$4"
referenceUserForQuota=$(sort -t":" -k3 /etc/passwd | awk 'BEGIN{FS=":"} $3>=1000{print $1}' | head -1)
echo -n "Setting same quota for new user '$username' than user '$referenceUserForQuota': ..."
edquota -p "$referenceUserForQuota" "$username" && echo "OK" || echo "KO!"