Bug 2080957

Summary:	"Ambiguous output redirect" warning with csh or tcsh
Product:	[Fedora] Fedora	Reporter:	Marc Dionne <marc.c.dionne>
Component:	elfutils	Assignee:	Mark Wielaard <mjw>
Status:	CLOSED ERRATA	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	low	Docs Contact:
Priority:	unspecified
Version:	36	CC:	aoliva, fche, jakub, mcermak, me, mjw
Target Milestone:	---
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:	elfutils-0.187-2.fc36	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2022-05-07 04:38:00 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Marc Dionne 2022-05-02 13:16:46 UTC

Description of problem:

The redirection in /etc/profile.d/debuginfod.csh, which is delivered by the elfutils-debuginfod-client rpm, causes the following warning to appear at login or whenever csh or tcsh are started:

Ambiguous output redirect.

The offending line is:

set debuginfod_urls=`sh -c "cat /etc/debuginfod/*.urls 2>/dev/null" | tr '\n' ' '`

... which was introduced with elfutils-debuginfod-client-0.187-1.fc36.  The warning did not occur with elfutils-debuginfod-client-0.186-3.fc36.


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

elfutils-debuginfod-client-0.187-1.fc36


How reproducible:

Warning occurs at every login or csh/tcsh startup that processes startup files.


Steps to Reproduce:
1. Login to affected system (any shell)
2. tcsh

Warning would occur at step 1 if the user's shell is csh or tcsh.


Actual results:


Expected results:


Additional info:

Comment 1 Mark Wielaard 2022-05-02 13:44:56 UTC

Sorry, I am travelling and don't have [t]csh installed locally at the moment. So I cannot easily replicate.

The odd thing is that the line that apparently reports the issue is explcitly using sh -c "..." precisely to work around the redirection limitations in [t]csh.

Comment 2 Marc Dionne 2022-05-02 14:10:17 UTC

It uses sh -c, but as there is no quoting around the redirection symbols (> and |), seems to me those would be handled by the shell handling the backticks, i.e. csh or tcsh.

Maybe some additional quoting could make things work, or this just need to be rewritten in a more csh/tcsh friendly way.

Comment 3 Mark Wielaard 2022-05-03 15:57:08 UTC

(In reply to Marc Dionne from comment #2)
> It uses sh -c, but as there is no quoting around the redirection symbols (>
> and |), seems to me those would be handled by the shell handling the
> backticks, i.e. csh or tcsh.

You are right. I am not sure how we missed this. It is fixed upstream now:
https://sourceware.org/pipermail/elfutils-devel/2022q2/005000.html

I'll prepare new elfutils packages.

Comment 4 Fedora Update System 2022-05-03 17:15:22 UTC

FEDORA-2022-287a6c3913 has been submitted as an update to Fedora 36. https://bodhi.fedoraproject.org/updates/FEDORA-2022-287a6c3913

Comment 5 Fedora Update System 2022-05-04 12:42:08 UTC

FEDORA-2022-287a6c3913 has been pushed to the Fedora 36 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --advisory=FEDORA-2022-287a6c3913`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2022-287a6c3913

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.

Comment 6 Fedora Update System 2022-05-07 04:38:00 UTC

FEDORA-2022-287a6c3913 has been pushed to the Fedora 36 stable repository.
If problem still persists, please make note of it in this bug report.