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Description of problem:
Useradd will not add a user to the system when using the -n flag if
a group named after the user exists in /etc/group.
On line 1817 of useradd.c, useradd performs a check to see if there
is a group which corresponds to the username specified and exits
if there is one. In the case where there is a group named after
the user, -n is specified, and the default group (in
/etc/default/useradd) is something else (say, groupid 100), useradd
will not add the user and exits with the error:
useradd: group <whatever> exists - if you want to add this user to that group,
Since we're using the -n flag, this shouldn't be relevant. This
upsets some automated scripts, which are expecting the documented
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. Add a group named 'foobar' (with gid=200 for example)
2. Add the line 'GROUP=80' to /etc/default/useradd (add a gid of 80 if there
3. Try to add a user with the default gid of 80 to the system:
useradd -n foobar
Actual Results: Got the error message:
useradd: group foobar exists - if you want to add this user to that group, use -g.
Expected Results: User should have been added with default group 80.
This error was not present in 7.3 (shadow-utils-20000902-7)
This problem is present in RHEL3
# rpm -q shadow-utils
# groupadd foobar
# useradd -n foobar
useradd: group foobar exists - if you want to add this user to that
group, use -g.
# groupdel foobar
# user add -n foobar #now it succeeds
# groups foobar
foobar : users
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