Bug 981145 – Command "less" doesn't work well

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Bug 981145 - Command "less" doesn't work well

Summary:	Command "less" doesn't work well

Status:	CLOSED ERRATA

Aliases:	None

Product:	Red Hat Enterprise Linux 6
Classification:	Red Hat
Component:	ovirt-node (Show other bugs)
Sub Component:
Version:	6.5
Hardware:	Unspecified Unspecified

Priority	high Severity high
Target Milestone:	rc
Target Release:	---
Assigned To:	Ryan Barry
QA Contact:	Virtualization Bugs
Docs Contact:

URL:
Whiteboard:
Keywords:

Depends On:
Blocks:
	Show dependency tree / graph

Reported:	2013-07-04 02:30 EDT by cshao
Modified:	2014-01-21 14:43 EST (History)
CC List:	14 users (show)

See Also:
Fixed In Version:	ovirt-node-3.0.1-2.el6
Doc Type:	Bug Fix
Doc Text:	Previously the command "less" wasn't working correctly. It produced a sequence of garbled characters when viewing the log or another file and it was hard to exit the current view page. This has been rectified using alias less "cat $1 \| /usr/bin/less", so "less" works correctly now.
Story Points:	---
Clone Of:
Environment:
Last Closed:	2014-01-21 14:43:58 EST
Type:	Bug
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

Attachments	(Terms of Use)
less (95.76 KB, image/png) 2013-07-04 02:30 EDT, cshao	no flags	Details
Add an attachment (proposed patch, testcase, etc.)

External Trackers
Tracker	ID	Priority	Status	Summary	Last Updated
Red Hat Product Errata	RHBA-2014:0033	normal	SHIPPED_LIVE	ovirt-node bug fix and enhancement update	2014-01-21 19:14:30 EST

Groups: None (edit)

Description cshao 2013-07-04 02:30:58 EDT

Created attachment 768602 [details]
less

Description of problem:
"Less" is a program similar to "more", but actually the command "less" doesn't work well.
1. Tt will show as garbled sequence of characters when user view log or other file.
2. It is hard to exit the current view page.

Version-Release number of selected component (if applicable):
rhev-hypervisor6-6.5-20130222.0.auto1707.el6.iso
ovirt-node-3.0.0-1.999.20130701111251git99aadc6.el6.noarch

How reproducible:
100%


Steps to Reproduce:
1. Install RHEV-H 6.5.
2. Login RHEV-H and drop to shell.
3. run command #less /var/log/ovirt.log

Actual results:
1. Command "less" doesn't work well,  it will show as garbled sequence of characters when user view log or other file.
2. It is hard to exit the current view page.

Expected results:
Command "less" can work well.

Additional info:

Comment 2 Mike Burns 2013-07-08 08:56:13 EDT

Agree this is bad/ugly.  We should definitely try to fix it, though it's not quite as high a priority since we don't support dropping to a shell and running commands manually.

Comment 3 Ryan Barry 2013-08-09 14:24:06 EDT

It's unlikely that this will make 6.5. It may be a fundamental problem with urwid, but no method I've attempted (switching VTs, different urwid screen renderers has resolved). Design problem.

Comment 4 Mike Burns 2013-08-15 10:23:26 EDT

(In reply to Ryan Barry from comment #3)
> It's unlikely that this will make 6.5. It may be a fundamental problem with
> urwid, but no method I've attempted (switching VTs, different urwid screen
> renderers has resolved). Design problem.

How is urwid impacting this?  we're in a shell environment, aren't we?

can we implement a simple workaround like:

alias less "cat $1 | /usr/bin/less"

Comment 5 Ryan Barry 2013-08-15 11:06:02 EDT

(In reply to Mike Burns from comment #4)
> How is urwid impacting this?  we're in a shell environment, aren't we?
> 
> can we implement a simple workaround like:
> 
> alias less "cat $1 | /usr/bin/less"

We can do this, which is surprising. I hadn't tried it (unnecessary use of cat and all that), but it works. urwid throws a ton of escape codes if you `less /some/file`, but works if you cat it first. I'll go that way.

Comment 10 cshao 2013-10-24 06:10:23 EDT

rhev-hypervisor6-6.5-20131017.0
ovirt-node-3.0.1-4.el6.noarch

Command "less" can work well.

So the bug is fixed, change bug status to VERIFIED.

Comment 12 Cheryn Tan 2013-11-07 19:32:56 EST

This bug is currently attached to errata RHBA-2013:15277. If this change is not to be documented in the text for this errata please either remove it from the errata, set the requires_doc_text flag to minus (-), or leave a "Doc Text" value of "--no tech note required" if you do not have permission to alter the flag.

Otherwise to aid in the development of relevant and accurate release documentation, please fill out the "Doc Text" field above with these four (4) pieces of information:

* Cause: What actions or circumstances cause this bug to present.
* Consequence: What happens when the bug presents.
* Fix: What was done to fix the bug.
* Result: What now happens when the actions or circumstances above occur. (NB: this is not the same as 'the bug doesn't present anymore')

Once filled out, please set the "Doc Type" field to the appropriate value for the type of change made and submit your edits to the bug.

For further details on the Cause, Consequence, Fix, Result format please refer to:

https://bugzilla.redhat.com/page.cgi?id=fields.html#cf_release_notes 

Thanks in advance.

Comment 14 errata-xmlrpc 2014-01-21 14:43:58 EST

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, and where to find the updated
files, follow the link below.

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

http://rhn.redhat.com/errata/RHBA-2014-0033.html

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