Description of problem:
When we use rpm-ostree to install a small RPM package like strace, which size is less than 300K, I have 226M available on my RHELAH, but I got "error: No space left on device" and failed to install strace finally, I checked disk space again, only 36M available, it means downloaded strace eats 190M=226M-36M disk space, and I haven't successfully install strace.

Version-Release number of selected component (if applicable):

[cloud-user@atomic-host-001 ~]$ cat /etc/redhat-release 
Red Hat Enterprise Linux Atomic Host release 7.2
[cloud-user@atomic-host-001 ~]$ atomic host status
State: idle
Deployments:
● rhel-atomic-host-ostree:rhel-atomic-host/7/x86_64/standard
       Version: 7.2.7 (2016-09-09 18:43:35)
        Commit: 347c3f5eb641e69fc602878c646cf42c4bcd5d9f36847a1f24ff8f3ec80f17b1
        OSName: rhel-atomic-host
      Unlocked: development

[cloud-user@atomic-host-001 ~]$ rpm -q atomic rpm-ostree-client
atomic-1.12.2-2.el7.x86_64
rpm-ostree-client-2016.5-1.atomic.el7.x86_64

How reproducible:
always

Steps to Reproduce:
1. df -hT
2. rpm-ostree add strace
3. repeat 1

Actual results:

[cloud-user@atomic-host-001 ~]$ df -hT
Filesystem                Type      Size  Used Avail Use% Mounted on
/dev/mapper/atomicos-root xfs       3.0G  2.7G  226M  93% /
devtmpfs                  devtmpfs  902M     0  902M   0% /dev
tmpfs                     tmpfs     921M     0  921M   0% /dev/shm
tmpfs                     tmpfs     921M  8.5M  912M   1% /run
tmpfs                     tmpfs     921M     0  921M   0% /sys/fs/cgroup
overlay                   overlay   3.0G  2.7G  226M  93% /usr
/dev/sda1                 xfs       297M  105M  193M  36% /boot
tmpfs                     tmpfs     185M     0  185M   0% /run/user/1000
/dev/dm-4                 xfs        10G  1.9M   10G   1% /var/mnt


[cloud-user@atomic-host-001 ~]$ sudo rpm-ostree pkg-add strace
notice: pkg-add is a preview command and subject to change.

Downloading metadata: [=================================================================================================================================================================] 100%
Resolving dependencies... done
Will download: 1 package (271.4 kB)

  Downloading from rhel-7-server-aus-rpms: [============================================================================================================================================] 100%

Importing: [============================================================================================================================================================================] 100%
Checking out tree 347c3f5... error: No space left on device
[cloud-user@atomic-host-001 ~]$ df -hT
Filesystem                Type      Size  Used Avail Use% Mounted on
/dev/mapper/atomicos-root xfs       3.0G  2.9G   36M  99% /
devtmpfs                  devtmpfs  902M     0  902M   0% /dev
tmpfs                     tmpfs     921M     0  921M   0% /dev/shm
tmpfs                     tmpfs     921M  8.5M  912M   1% /run
tmpfs                     tmpfs     921M     0  921M   0% /sys/fs/cgroup
overlay                   overlay   3.0G  2.9G   36M  99% /usr
/dev/sda1                 xfs       297M  105M  193M  36% /boot
tmpfs                     tmpfs     185M     0  185M   0% /run/user/1000
/dev/dm-4                 xfs        10G  1.9M   10G   1% /var/mnt

[cloud-user@atomic-host-001 ~]$ rpm -q strace
package strace is not installed


Expected results:


Additional info:

manually download strace RPM package then rpm install it w/ unlock mode, it's okay for me.

[cloud-user@atomic-host-001 ~]$ sudo rpm -ivh strace-4.8-11.el7.x86_64.rpm 
Preparing...                          ################################# [100%]
Updating / installing...
   1:strace-4.8-11.el7                ################################# [100%]

[cloud-user@atomic-host-001 ~]$ rpm -q strace
strace-4.8-11.el7.x86_64


I seems the rpm-ostree pkg-add (preview) and rpm-ostree pkg-remove (preview) have been removed from help document of rpm-ostree-client-2016.9-1.atomic.el7.x86_64, is it an expected result? but in fact, these functions still exist.

[cloud-user@atomic-host-001 ~]$ rpm -q rpm-ostree-client
rpm-ostree-client-2016.9-1.atomic.el7.x86_64

[cloud-user@atomic-host-001 ~]$ rpm-ostree -h
Usage:
  rpm-ostree [OPTION...] COMMAND

Builtin Commands:
  db
  deploy
  rebase
  rollback
  status
  upgrade
  install
  uninstall

Help Options:
  -h, --help       Show help options

Application Options:
  --version        Print version information and exit

[cloud-user@atomic-host-001 ~]$ sudo rpm-ostree pkg-add
Usage:
  rpm-ostree pkg-add [OPTION...] PACKAGE [PACKAGE...] - Download and install layered RPM packages

Help Options:
  -h, --help            Show help options

Application Options:
  --os=OSNAME           Operate on provided OSNAME
  -r, --reboot          Initiate a reboot after upgrade is prepared
  -n, --dry-run         Exit after printing the transaction
  --sysroot=SYSROOT     Use system root SYSROOT (default: /)
  --peer                Force a peer-to-peer connection instead of using the system message bus
  --version             Print version information and exit


In addition, if users is failed to install RPM packages, and then they wanna release disk space, how to do? maybe, we need a pkg-reset or pkg-cleanup functions?

[cloud-user@atomic-host-001 ~]$ sudo rpm-ostree pkg-remove strace
error: Package 'strace' is not currently requested