[Bug 8586] New: adduser without -s (shell) creates invalid /etc/passwd entry

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=8586

            Bug ID: 8586
           Summary: adduser without -s (shell) creates invalid /etc/passwd
                    entry
           Product: Busybox
           Version: 1.22.x
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P5
         Component: Other
          Assignee: unassigned at busybox.net
          Reporter: Jonathon.Reinhart at gmail.com
                CC: busybox-cvs at busybox.net

Running busybox from the following docker image:

$ docker images
docker.io/busybox                latest              8c2e06607696        8
months ago        2.43 MB

$ docker run --rm -it busybox
/ # adduser -D foouser
/ # cat /etc/passwd
root:x:0:0:root:/root:/bin/sh
daemon:x:1:1:daemon:/usr/sbin:/bin/sh
bin:x:2:2:bin:/bin:/bin/sh
sys:x:3:3:sys:/dev:/bin/sh
sync:x:4:100:sync:/bin:/bin/sync
mail:x:8:8:mail:/var/spool/mail:/bin/sh
proxy:x:13:13:proxy:/bin:/bin/sh
www-data:x:33:33:www-data:/var/www:/bin/sh
backup:x:34:34:backup:/var/backups:/bin/sh
operator:x:37:37:Operator:/var:/bin/sh
haldaemon:x:68:68:hald:/:/bin/sh
dbus:x:81:81:dbus:/var/run/dbus:/bin/sh
ftp:x:83:83:ftp:/home/ftp:/bin/sh
nobody:x:99:99:nobody:/home:/bin/sh
sshd:x:103:99:Operator:/var:/bin/sh
default:x:1000:1000:Default non-root user:/home/default:/bin/sh
foouser:x:1001:1001:Linux User,,,:/home/foouser:fault non-root user
/ # busybox
BusyBox v1.22.1 (2014-05-22 23:22:11 UTC) multi-call binary.
...

You can see that foouser has a bogus shell.

This appears to be fixed in v1.24.1, but I can find no indication at
https://www.busybox.net/news.html, or in Git as to what was broken.

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