Bug 1112551

Summary: Provide criteria-based LVM reporting
Product: Red Hat Enterprise Linux 6 Reporter: Peter Rajnoha <prajnoha>
Component: lvm2Assignee: Peter Rajnoha <prajnoha>
lvm2 sub component: Command-line tools (RHEL6) QA Contact: Cluster QE <mspqa-list>
Status: CLOSED ERRATA Docs Contact:
Severity: low    
Priority: low CC: agk, bmarzins, bmr, cmarthal, dwysocha, heinzm, jbrassow, jonathan, lvm-team, msnitzer, nperic, prajnoha, prockai, teigland, thornber, zkabelac
Version: 6.6Keywords: FutureFeature
Target Milestone: rc   
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: lvm2-2.02.107-1.el6 Doc Type: Enhancement
Doc Text:
Feature: Criteria-based LVM reporting. Reason: When there are numerous VGs/LVs to manage, it may be impractical to handle them as the output from LVM reporting tools may be long enough for the user to read it quickly and efficiently. Also, when using output from LVM reporting tools in scripts, it's usually required to process only the lines we're interested in - most of the time this was accomplished by use of external tools to select proper lines (e.g. grep) from the outpout which was then processed further. This approach caused various problems, including dependencies on external tools and also most of the time there was a need to change the script itself if LVM changed the output or formatting in some way. This posed extra effort to handle LVM output efficiently and correctly. Criteria-based reporting provides a built-in selection of lines to be reported by LVM reporting command. Result: LVM reporting commands (pvs/vgs/lvs/pvdisplay/vgdisplay/lvdisplay/lvm devtypes) now understand new -S/--select SelectionCriteria option where SelectionCriteria are criteria constructed by using reporting field names, restricting field values we're interested in by using comparison operators and creating more complex criteria by using grouping and logical operators.
 Story Points: ---
Clone Of: 867376 Environment:
Last Closed: 2014-10-14 08:25:16 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:

Description Peter Rajnoha 2014-06-24 08:00:33 UTC 
This feature got into 6.6 with lvm2 v2.02.107. I'm cloning this feature bug for 6.6 and QA to test this/comment on this.

+++ This bug was initially created as a clone of Bug #867376 +++
--- Additional comment from Peter Rajnoha on 2014-06-24 09:15:14 CEST ---

The final released version looks like this (lvm2 v2.02.107/libdevmapper v1.02.86):

pvs/vgs/lvs/pvdisplay/vgdisplay/lvdisplay/lvm devtypes -S SELECTION

# pvs -S help

  Selection operands
  ------------------
    field               - Reporting field.
    number              - Non-negative integer value.
    size                - Floating point value with units, 'm' unit used by default if not specified.
    percent             - Non-negative integer with or without % suffix.
    string              - Characters quoted by ' or " or unquoted.
    string list         - Strings enclosed by [ ] and elements delimited by either
                          "all items must match" or "at least one item must match" operator.
    regular expression  - Characters quoted by ' or " or unquoted.
   
  Reserved values
  ---------------
    -1, undefined, undef, unknown   - Reserved value for undefined numeric value. [number]
    unmanaged                       - Reserved value for unmanaged number of metadata copies in VG. [number]
    auto                            - Reserved value for size that is automatically calculated. [size]
   
  Selection operators
  -------------------
    Comparison operators:
        =~  - Matching regular expression. [regex]
        !~  - Not matching regular expression. [regex]
         =  - Equal to. [number, size, percent, string, string list]
        !=  - Not equal to. [number, size, percent, string, string_list]
        >=  - Greater than or equal to. [number, size, percent]
         >  - Greater than. [number, size, percent]
        <=  - Less than or equal to. [number, size, percent]
         <  - Less than. [number, size, percent]
   
    Logical and grouping operators:
        &&  - All fields must match
         ,  - All fields must match
        ||  - At least one field must match
         #  - At least one field must match
         !  - Logical negation
         (  - Left parenthesis
         )  - Right parenthesis
         [  - List start
         ]  - List end


(the reserved values are specific to the tool, e.g. dmsetup doesn't define any of these reserved values)

From man lvm (8):

Informal grammar specification:

              STATEMENT = column cmp_op VALUE | STATEMENT log_op STATEMENT | (STATEMENT) | !(STATEMENT)

              VALUE = [VALUE log_op VALUE]
              For list-based types: string list. The log_op must always be of one type within the whole list value.

              VALUE = value
              For scalar types: number (integer), size (floating point number with size unit suffix), percent (floating point number with or without % suffix), string.
Comment 1 Peter Rajnoha 2014-06-24 08:02:48 UTC 
There's quite extensive test in LVM test suite already: https://git.fedorahosted.org/cgit/lvm2.git/tree/test/shell/report-select.sh
Comment 3 Corey Marthaler 2014-08-06 23:36:17 UTC 
Marking verified (Sanity Only), I went through a few of these and verified that they work. We'll try and integrate this into our tests for even more regression coverage in the future.


2.6.32-495.el6.x86_64
lvm2-2.02.109-1.el6    BUILT: Tue Aug  5 10:36:23 CDT 2014
lvm2-libs-2.02.109-1.el6    BUILT: Tue Aug  5 10:36:23 CDT 2014
lvm2-cluster-2.02.109-1.el6    BUILT: Tue Aug  5 10:36:23 CDT 2014
udev-147-2.57.el6    BUILT: Thu Jul 24 08:48:47 CDT 2014
device-mapper-1.02.88-1.el6    BUILT: Tue Aug  5 10:36:23 CDT 2014
device-mapper-libs-1.02.88-1.el6    BUILT: Tue Aug  5 10:36:23 CDT 2014
device-mapper-event-1.02.88-1.el6    BUILT: Tue Aug  5 10:36:23 CDT 2014
device-mapper-event-libs-1.02.88-1.el6    BUILT: Tue Aug  5 10:36:23 CDT 2014
device-mapper-persistent-data-0.3.2-1.el6    BUILT: Fri Apr  4 08:43:06 CDT 2014
cmirror-2.02.109-1.el6    BUILT: Tue Aug  5 10:36:23 CDT 2014
Comment 4 errata-xmlrpc 2014-10-14 08:25:16 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.

http://rhn.redhat.com/errata/RHBA-2014-1387.html