[Bug 1785389] [NEW] useradd is not looking for --gid in --root

[Simon Levesque]

Public bug reported:

Application: /usr/sbin/useradd

Doing:
 THE_ID=70000
 THE_NAME=aaaaa
 groupadd --gid $THE_ID $THE_NAME
 useradd --uid $THE_ID --gid $THE_ID --home-dir /home/$THE_NAME --create-home $THE_NAME

is working fine, but when specifying a --root, the provided --gid is not
checked in the group file in the --root folder. Steps:

 BASE_FOLDER=$(mktemp -d)
 cd $BASE_FOLDER
 THE_ID=70000
 THE_NAME=aaaaa
 mkdir etc home
 touch etc/group etc/passwd etc/shadow
 groupadd --root $BASE_FOLDER --gid $THE_ID $THE_NAME
 useradd --root $BASE_FOLDER --uid $THE_ID --gid $THE_ID --home-dir /home/$THE_NAME --create-home $THE_NAME

Getting error
  useradd: group '70000' does not exist

checking the group file, the group exists:
grep aaaaa $BASE_FOLDER/etc/group
  aaaaa:x:70000:


------

Description:	Ubuntu 18.04.1 LTS
Release:	18.04

passwd:
  Installed: 1:4.5-1ubuntu1
  Candidate: 1:4.5-1ubuntu1
  Version table:
 *** 1:4.5-1ubuntu1 500
        500 http://us.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
        100 /var/lib/dpkg/status

** Affects: shadow (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1785389

Title:
  useradd is not looking for --gid in --root

Status in shadow package in Ubuntu:
  New

Bug description:
  Application: /usr/sbin/useradd

  Doing:
   THE_ID=70000
   THE_NAME=aaaaa
   groupadd --gid $THE_ID $THE_NAME
   useradd --uid $THE_ID --gid $THE_ID --home-dir /home/$THE_NAME --create-home $THE_NAME

  is working fine, but when specifying a --root, the provided --gid is
  not checked in the group file in the --root folder. Steps:

   BASE_FOLDER=$(mktemp -d)
   cd $BASE_FOLDER
   THE_ID=70000
   THE_NAME=aaaaa
   mkdir etc home
   touch etc/group etc/passwd etc/shadow
   groupadd --root $BASE_FOLDER --gid $THE_ID $THE_NAME
   useradd --root $BASE_FOLDER --uid $THE_ID --gid $THE_ID --home-dir /home/$THE_NAME --create-home $THE_NAME

  Getting error
    useradd: group '70000' does not exist

  checking the group file, the group exists:
  grep aaaaa $BASE_FOLDER/etc/group
    aaaaa:x:70000:

  
  ------

  Description:	Ubuntu 18.04.1 LTS
  Release:	18.04

  passwd:
    Installed: 1:4.5-1ubuntu1
    Candidate: 1:4.5-1ubuntu1
    Version table:
   *** 1:4.5-1ubuntu1 500
          500 http://us.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
          100 /var/lib/dpkg/status

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