adduser: create a group for net user too

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

diff --git a/loginutils/adduser.c b/loginutils/adduser.c
index 5f593ac..da41fd7 100644 (file)
--- a/loginutils/adduser.c
+++ b/loginutils/adduser.c
@@ -69,8 +69,11 @@ static void addgroup_wrapper(struct passwd *p, const char *group_name)
 {
        char *cmd;
 
-       cmd = xasprintf("addgroup '%s' '%s'",
-                       p->pw_name, group_name);
+       if (group_name) /* Add user to existing group */
+               cmd = xasprintf("addgroup '%s' '%s'", p->pw_name, group_name);
+       else    /* Add user to his own group with the first free gid found in passwd_study */
+               cmd = xasprintf("addgroup -g %u '%s'", (unsigned)p->pw_gid, p->pw_name);
+       /* Warning: to be compatible with external addgroup programs we should use --gid instead */
        system(cmd);
        free(cmd);
 }
@@ -79,10 +82,8 @@ static void passwd_wrapper(const char *login) NORETURN;
 
 static void passwd_wrapper(const char *login)
 {
-       static const char prog[] ALIGN1 = "passwd";
-
-       BB_EXECLP(prog, prog, login, NULL);
-       bb_error_msg_and_die("can't execute %s, you must set password manually", prog);
+       BB_EXECLP("passwd", "passwd", login, NULL);
+       bb_error_msg_and_die("can't execute passwd, you must set password manually");
 }
 
 #if ENABLE_FEATURE_ADDUSER_LONG_OPTIONS
@@ -189,10 +190,7 @@ int adduser_main(int argc UNUSED_PARAM, char **argv)
 #endif
 
        /* add to group */
-       /* addgroup should be responsible for dealing w/ gshadow */
-       /* if using a pre-existing group, don't create one */
-       if (usegroup)
-               addgroup_wrapper(&pw, usegroup);
+       addgroup_wrapper(&pw, usegroup);
 
        /* clear the umask for this process so it doesn't
         * screw up the permissions on the mkdir and chown. */
@@ -201,9 +199,9 @@ int adduser_main(int argc UNUSED_PARAM, char **argv)
                /* set the owner and group so it is owned by the new user,
                 * then fix up the permissions to 2755. Can't do it before
                 * since chown will clear the setgid bit */
-               if (mkdir(pw.pw_dir, 0755)
-                || chown(pw.pw_dir, pw.pw_uid, pw.pw_gid)
-                || chmod(pw.pw_dir, 02755) /* set setgid bit on homedir */
+               if ((mkdir(pw.pw_dir, 0755) != 0 && errno != EEXIST)
+                || chown(pw.pw_dir, pw.pw_uid, pw.pw_gid) != 0
+                || chmod(pw.pw_dir, 02755) != 0 /* set setgid bit on homedir */
                ) {
                        bb_simple_perror_msg(pw.pw_dir);
                }