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Bug 1544520

Summary:	Fstab lens cannot parse lines with leading whitespaces
Product:	Red Hat Enterprise Linux 7	Reporter:	Pino Toscano <ptoscano>
Component:	augeas	Assignee:	Pino Toscano <ptoscano>
Status:	CLOSED ERRATA	QA Contact:	Virtualization Bugs <virt-bugs>
Severity:	high	Docs Contact:	Jiri Herrmann <jherrman>
Priority:	high
Version:	7.5	CC:	jherrman, mtessun, rjones, xchen, yoguo
Target Milestone:	rc	Keywords:	ZStream
Target Release:	---
Hardware:	Unspecified
OS:	All
Whiteboard:
Fixed In Version:	augeas-1.4.0-6.el7	Doc Type:	Bug Fix
Doc Text:	Augeas reads `/etc/fstab` with white spaces more reliably Previously, Augeas was not able to parse lines in the `/etc/fstab` file if they had white spaces at the beginning. This sometime caused problems in software tools that use Augeas, such as the virt-v2v utility or the Puppet management tool. With this update, the Fstab lens of Augeas correctly ignores white spaces at the beginning of lines. As a result, Augeas now reads `/etc/fstab` as expected.	Story Points:	---
Clone Of:
Clones:	1554927 (view as bug list)		Environment:
Last Closed:	2018-10-30 07:45:20 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:
Bug Depends On:
Bug Blocks:	1554927

Description Pino Toscano 2018-02-12 18:04:11 UTC

Description of problem:
If any line with a filesystem specification in /etc/fstab has whitespace at the beginning, the Fstab lens cannot parse it. This seems supported by tools, and there were reports of customers with such /etc/fstab in working systems.

Steps to Reproduce:
1. edit /etc/fstab, and add whitespaces at the beginning of a line that contains a filesystem
2. run `augtool`
3. in the augtool prompt, run `ls /augeas//error`

Actual results:
augtool> ls /augeas//error
pos = 221
line = 9
char = 2
lens/ = /usr/share/augeas/lenses/dist/fstab.aug:34.12-.42:
message = Iterated lens matched less than it should

(the actual values of 'pos', 'line' and 'char' depend on the actual file)

Expected results:
1. no errors printed
2. the same output of `print /files/etc/fstab/` for both /etc/fstab without the whitespaces added and with the whitespaces

Additional info:
I just sent an PR to upstream for this:
https://github.com/hercules-team/augeas/pull/544

Comment 1 YongkuiGuo 2018-02-14 07:16:02 UTC

Reproduced it with package:
augeas-1.4.0-5.el7.x86_64

Steps:
1. edit /etc/fstab, and add whitespaces at the beginning of the following line:
  /dev/mapper/rhel_amd--xxx--4--1-home /home                   xfs     defaults        0 0

2. run the augtool command:
augtool> print /files/etc/fstab
augtool> ls /augeas//error
pos = 406
line = 11
char = 2
lens/ = /usr/share/augeas/lenses/dist/fstab.aug:34.12-.42:
message = Iterated lens matched less than it should

Comment 5 YongkuiGuo 2018-03-30 05:01:51 UTC

Verified it with package:
augeas-1.4.0-6.el7.x86_64

Steps:
1. edit /etc/fstab and add whitespaces at the beginning of the following line:
  /dev/mapper/rhel_hp--dlxxx--04-home /home   xfs     defaults        0 0

2. run the augtool command:
#augtool print /files/etc/fstab
...
/files/etc/fstab/3
/files/etc/fstab/3/spec = "/dev/mapper/rhel_hp--dlxxx--04-home"
/files/etc/fstab/3/file = "/home"
/files/etc/fstab/3/vfstype = "xfs"
/files/etc/fstab/3/opt = "defaults"
/files/etc/fstab/3/dump = "0"
/files/etc/fstab/3/passno = "0"
...


So verified it.

Comment 7 errata-xmlrpc 2018-10-30 07:45:20 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://access.redhat.com/errata/RHBA-2018:3020