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Description of problem:
For example,
mke2fs doesn't support xfs, it should give a meaningful error message when you specified xfs, but not gives ext3 


Version-Release number of selected component (if applicable):
libguestfs-1.22.2-1.el7.x86_64

How reproducible:
100%


Steps to Reproduce:
1. create a disk with xfs
[root]# guestfish -N fsfs
><fs> quit

2.
[root]# eval `guestfish --listen`
[root]# guestfish --remote -x -- -add test1.img
[root]# guestfish --remote -x -- -alloc journalname 50M
[root]# guestfish --remote -x -- -run
[root]# guestfish --remote -- -mke2journal 1024  /dev/sdb
[root]# guestfish --remote -- -mke2fs-J xfs 1024 /dev/sda /dev/sdb
[root]# vfs_type=`guestfish --remote -- -vfs-type /dev/sda`
[root]# echo $vfs_type
ext3


Actual results:
Got ext3 type


Expected results:
Give a error message

Additional info:

One line reproducer:

$ guestfish -N part -N part mke2journal 1024 /dev/sda1 : mke2fs-J xfs 1024 /dev/sdb1 /dev/sda1
$ echo $?
0

The mke2fs-J command should give an error instead of succeeding.

Fixed upstream in
https://github.com/libguestfs/libguestfs/commit/fb0bd82dbe9c3cad40312e89de5b61195f5fd889

Verified with libguestfs-1.22.6-16.el7.x86_64

# guestfish -N part -N part mke2journal 1024 /dev/sda1 : mke2fs-J xfs 1024 /dev/sdb1 /dev/sda1
libguestfs: error: mke2fs_J: xfs: not a valid extended filesystem type

This request was resolved in Red Hat Enterprise Linux 7.0.

Contact your manager or support representative in case you have further questions about the request.