Bug 237659

Summary:	RFE: add -r option to losetup to create a read-only loop
Product:	Red Hat Enterprise Linux 5	Reporter:	Daniel Berrangé <berrange>
Component:	util-linux	Assignee:	Karel Zak <kzak>
Status:	CLOSED ERRATA	QA Contact:	Ben Levenson <benl>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	5.0	CC:	konradr
Target Milestone:	---	Keywords:	Reopened
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	RHBA-2007-0561	Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2007-11-07 16:37:20 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	211749
Bug Blocks:

Description Daniel Berrangé 2007-04-24 15:30:59 UTC

+++ This bug was initially created as a clone of Bug #211749 +++

Current losetup supports creating RO loops: the set_loop has an argument that
requests and returns the open mode, and the function also checks if the
filesystem the file resides on is mounted read-only.

But there is no way to specify the RO mode from the command line. The attached
patch adds a new -r option.

-- Additional comment from l_rocha on 2006-10-21 15:09 EST --
Created an attachment (id=139067)
patch adding -r option to losetup


-- Additional comment from kzak on 2006-11-01 09:11 EST --
FC6 seems like better target for this feature. Thanks for your patch.

Comment 1 Daniel Berrangé 2007-04-24 15:33:46 UTC

The -r  capability is needed by Xen to allow us to attach a read-only ISO image
from a read-write NFS share to a local loop device. Without the -r option,
losetup fails with -EACCESS. The -r flag is already supported in Fedora Core 6 /
Fedora 7 and thus we're using it in Fedora Xen block device hotplug scripts.

Comment 2 Karel Zak 2007-04-24 18:39:38 UTC

The patch is very small and not invasive.

Comment 3 RHEL Program Management 2007-06-05 20:29:54 UTC

This request was evaluated by Red Hat Product Management for
inclusion in a Red Hat Enterprise Linux release.  Since this
bugzilla is in a component that is not approved for the current
release, it has been closed with resolution deferred.  You may
reopen this bugzilla for consideration in the next release.

Comment 4 Daniel Riek 2007-06-05 20:51:43 UTC

Repopening and requesting Exception as this is a dependency for the Xen related
issue in bug 225166.

Comment 9 errata-xmlrpc 2007-11-07 16:37:20 UTC

An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on the solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.

http://rhn.redhat.com/errata/RHBA-2007-0561.html