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Description of problem:
foreman-maintain packages install/update command(without --assumeyes) hangs after listing packages and installed size, hangs there waiting for confirmation for [y/d/N] in step `Is this ok [y/d/N]:`, which never printed on stdout.

If hit enter on a keyboard it just exits a user command, and if randomly hit `y` then it completes a packages install/update

Version-Release number of selected component (if applicable):
rubygem-foreman_maintain-0.8.19-1.el7sat.noarch

How reproducible:
Always

Steps to Reproduce:
1. # foreman-maintain packages install/update walrus
2.
3.

Actual results:
Command waiting for user confirmation, which was never asked.

Expected results:
Should ask for confirmation.

Additional info:
https://privatebin-it-iso.int.open.paas.redhat.com/?868f7022abf7b4a7#6mnFqZiCiMLQhp5odqd6YBdLYCv7hafWMWL76sav15Hc

WORKAROUND:

Hit Y and it proceeds.

Please list as known issue for 6.10 GA ; plan to include fix in 6.10.1

Created redmine issue https://projects.theforeman.org/issues/33803 from this bug

upstream is merged, POST

Verified.

Tested on Satellite 6.10.1 Snap 1.0 
Version: rubygem-foreman_maintain-0.8.21-1.el7sat.noarch

Steps:
1. satellite-maintain packages install <pkg-name>

Observation:
f-m Package install (without --assumeyes) waits for confirmation with a message like `Is this ok [y/d/N]:`
Also tested new f-m interactive command runner stdbuf with nohup job to run content migration on 6.9, and it works fine (related to BZ 1965218)

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (Satellite Maintenance 6.10.1 Async Bug Fix Update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2021:4736