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CVS: rights

I am configuring CVS server and got a problem with users/groups/rights:

Imagine i want to create two groups of accounts:

Group 1:  supervisor
Group 2: smith, John, Mike

and say people in Group 2 can access(read and write) file my_file.c
also supervisor is permitted to access this file, however, after supervisor
accessed this file, the owner of this file was changed to be "supervisor" and
people in Group 2 can no longer access it !!!

Anyone knows what is the usual method to overcome this problem?

Many thanks!
1 Solution
I think you need to add the group 2 into the supervisor so that the same group member can access the file.

eg. said smith, John, Mike belonged to group2, and supervisor will belonged to group1 and group2, and your file(s)/directory for group2 have to set the permission to rxwrwx--- (770), so now when supervisor change anything in the file(s), the file(s) will become the supervisor but the file(s) also belonged to group2, due to the file(s) permission is 770, that's mean all members belonged to group2 have the rwx permission.

the way to add supervisor into group2 :

if supervisor already exist, usermod -G group2 supervisor, this will add supervisor into group2.
if supervisor not yet create, useradd -G group1,group2 supervisor, for this supervisor will belonged 2 groups, and the major group is group1.

but remember when supervisor edit any files belonged to group2, the files owner will become supervisor, only the group of the file will not change.

eg. a file called test, at the begining the test is smith:group2, after supervisor edit/change and save the test, it will become supervisor:group2.

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