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Bug 1196566

Summary: IFS incorrectly splitting herestrings in bash 4.2
Product: Red Hat Enterprise Linux 7 Reporter: Ian Wienand <iwienand>
Component: bashAssignee: Ondrej Oprala <ooprala>
Status: CLOSED ERRATA QA Contact: Martin Kyral <mkyral>
Severity: unspecified Docs Contact:
Priority: unspecified    
Version: 7.3CC: isenfeld, ovasik
Target Milestone: rc   
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard:
Fixed In Version: bash-4.2.46-14.el7 Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of:
: 1250070 (view as bug list) Environment:
Last Closed: 2015-11-19 04:39:47 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 Ian Wienand 2015-02-26 10:10:10 UTC
We hit this problem in devstack [1] and maybe it is worth a backport?

consider

---
foo="hello,there"

IFS=, read hello there <<< $foo

echo $hello
echo "---"
echo $there
echo "---"
---

this ends up outputting

hello there
---

---

on bash-4.2.  after some digging, the best reference is [2] .  To quote from it

---
The bug is that the here string appears to undergo partial splitting using the "leaked" value of IFS being passed to read. As a result, the string becomes hello world, but is still seen by read as a single word. Since that word does not contain a :, read does not split it into two words, and the entire string is assigned to var1.
---

Thus quoting "$foo" above works around this, but it is a issue when trying to write portable shell scripts

[1] https://review.openstack.org/#/c/159366
[2] http://stackoverflow.com/questions/20144593/trying-to-split-a-string-into-two-variables

Comment 1 Ian Wienand 2015-02-26 10:11:53 UTC
I should note here that this is fixed in 4.3

Comment 2 Ondrej Oprala 2015-02-26 12:25:01 UTC
Hmm thanks for the report, I'll look at it, shouldn't be hard to backport.

Comment 10 errata-xmlrpc 2015-11-19 04:39:47 UTC
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.

https://rhn.redhat.com/errata/RHBA-2015-2144.html