Jesse,
I could propose to replace field_edits with file_edits, for example,
generic (library ready) body:
bundle edit_line etc_fstab(device,mpoint,fstype,opts,passes)
{
classes:
"already_there" expression =>
regline("$(device)\s+$(mpoint)\s+$(fstype)\s+$(opts)\s+$(passes)",
"$(edit.filename)");
!already_there::
"device_match" expression => regline("$(device)\s+.*", "$(edit.filename)");
"mpoint_match" expression => regline(".*\s+$(mpoint)\s+.*",
"$(edit.filename)");
delete_lines:
device_match::
"$(device)\s+.*" comment => "Wrong mountpoint, or fstype, or options";
mpoint_match::
".*\s+$(mpoint)\s+.*" comment => "Mountpoint misused";
insert_lines:
!already_there::
"$(device) $(mpoint) $(fstype) $(opts) $(passes)";
}
2010/12/2 Jesse Becker <[email protected]>:
> I have a file (/etc/fstab) with well defined fields and
> subfields, and am trying to edit one of the fields, including removing
> duplicate entries.
>
>
> Here's the original line in question:
>
> /dev/md2 /scratch ext3 defaults 1 2
>
> Here's what I want it to look like at the end:
>
> /dev/md2 /scratch ext3 usrquota,grpquota 1 2
>
>
> Due to an oddly non-convergent (?!) set of field_edits, I have a line
> that looks like this:
>
> /dev/md2 /scratch ext3
> usrquota,grpquota,usrquota,grpquota,usrquota,grpquota 1 2
>
>
> As I see it, I originally needed to do two things:
>
> 1) Add the two options passed to field #4.
> 2) Delete the "default" subfield value, if it exists.
>
> For some reason, the values in #1 are appended repeatedly, even if they
> already exist in that field. The 'default' value is removed correctly
>
>
> Here is the code that I'm using (the "col" body comes from the stdlib):
>
> bundle scratch {
> files:
> scratch_hosts::
> "/etc/fstab"
> edit_line => add_mount_options('/scratch','usrquota,grpquota'),
> handle => 'scratch_add_quotas_for_scratch_to_fstab',
> classes => trigger('scratch_added_quota');
> }
>
> bundle edit_line add_mount_options(filesystem,options) {
>
> field_edits:
>
> "^.*\s+${filesystem}\s+.*(usrquota,grpquota,usrquota,grpquota,?)+.*$"
> edit_field => col('\s+',4,"(usrquota,grpquota,)+",'delete'),
> comment => "Remove duplicate urgquota,grpquota entries";
>
>
> "^.*\s+${filesystem}\s+.*$"
> edit_field => col('\s+',4,"${options}",'append'),
> comment => "Add options to fstab column 4";
>
>
> "^.*\s+${filesystem}\s+.*defaults.*$"
> edit_field => col('\s+',4,'defaults','delete'),
> comment => "Remove default option";
>
> }
>
>
>
> Here is the relevant output from running under --verbose (this is
> version 3.0.5p1):
>
>
>
>
> cf3 =========================================================
> cf3 files in bundle scratch (1)
> cf3 =========================================================
> cf3
> cf3 Verifying SQL table promises is only available with Cfengine Nova or above
> cf3
> cf3 .........................................................
> cf3 Promise handle: scratch_add_quotas_for_scratch_to_fstab
> cf3 Promise made by: /etc/fstab
> cf3 .........................................................
> cf3
> cf3 -> Using literal pathtype for /etc/fstab
> cf3 -> Handling file existence constraints on /etc/fstab
> cf3 -> Handling file edits in edit_line bundle add_mount_options
> cf3
> cf3 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
> cf3 BUNDLE add_mount_options( {'/scratch','usrquota'} )
> cf3 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
> cf3
> cf3 ? Augment scope add_mount_options with filesystem
> cf3 ? Augment scope add_mount_options with options
> cf3 ?? Private class context
> cf3
> cf3
> cf3 = = = = = = = = = = = = = = = = = = = = = = = = = = = =
> cf3 field_edits in bundle add_mount_options
> cf3 = = = = = = = = = = = = = = = = = = = = = = = = = = = =
> cf3
> cf3
> cf3 .........................................................
> cf3 Promise handle:
> cf3 Promise made by:
> ^.*\s+/scratch\s+.*(usrquota,grpquota,usrquota,grpquota,?)+.*$
> cf3
> cf3 Comment: Remove duplicate urgquota,grpquota entries
> cf3 .........................................................
> cf3
> cf3 - Matched line (/dev/md2 /scratch ext3
> usrquota,grpquota,usrquota,grpquota,usrquota,grpquota 1
> 2)
> cf3 -> Stopped at field 4
> cf3 -> No need to edit field in /etc/fstab
> cf3
> cf3 .........................................................
> cf3 Promise handle:
> cf3 Promise made by: ^.*\s+/scratch\s+.*$
> cf3
> cf3 Comment: Add options to fstab column 4
> cf3 .........................................................
> cf3
> cf3 - Matched line (/dev/md2 /scratch ext3
> usrquota,grpquota,usrquota,grpquota,usrquota,grpquota 1
> 2)
> cf3 -> Stopped at field 4
> cf3 -> No need to edit field in /etc/fstab
> cf3
> cf3 .........................................................
> cf3 Promise handle:
> cf3 Promise made by: ^.*\s+/scratch\s+.*defaults.*$
> cf3
> cf3 Comment: Remove default option
> cf3 .........................................................
> cf3
> cf3 ?? Private class context
> cf3
> cf3
> cf3 = = = = = = = = = = = = = = = = = = = = = = = = = = = =
> cf3 field_edits in bundle add_mount_options
> cf3 = = = = = = = = = = = = = = = = = = = = = = = = = = = =
> cf3
> cf3
> cf3 .........................................................
> cf3 Promise handle:
> cf3 Promise made by:
> ^.*\s+/scratch\s+.*(usrquota,grpquota,usrquota,grpquota,?)+.*$
> cf3
> cf3 Comment: Remove duplicate urgquota,grpquota entries
> cf3 .........................................................
> cf3
> cf3 -> This promise has already been verified
> cf3
> cf3 .........................................................
> cf3 Promise handle:
> cf3 Promise made by: ^.*\s+/scratch\s+.*$
> cf3
> cf3 Comment: Add options to fstab column 4
> cf3 .........................................................
> cf3
> cf3 -> This promise has already been verified
> cf3
> cf3 .........................................................
> cf3 Promise handle:
> cf3 Promise made by: ^.*\s+/scratch\s+.*defaults.*$
> cf3
> cf3 Comment: Remove default option
> cf3 .........................................................
> cf3
> cf3 -> This promise has already been verified
> cf3 ?? Private class context
> cf3
> cf3
> cf3 = = = = = = = = = = = = = = = = = = = = = = = = = = = =
> cf3 field_edits in bundle add_mount_options
> cf3 = = = = = = = = = = = = = = = = = = = = = = = = = = = =
> cf3
> cf3
> cf3 .........................................................
> cf3 Promise handle:
> cf3 Promise made by:
> ^.*\s+/scratch\s+.*(usrquota,grpquota,usrquota,grpquota,?)+.*$
> cf3
> cf3 Comment: Remove duplicate urgquota,grpquota entries
> cf3 .........................................................
> cf3
> cf3 -> This promise has already been verified
> cf3
> cf3 .........................................................
> cf3 Promise handle:
> cf3 Promise made by: ^.*\s+/scratch\s+.*$
> cf3
> cf3 Comment: Add options to fstab column 4
> cf3 .........................................................
> cf3
> cf3 -> This promise has already been verified
> cf3
> cf3 .........................................................
> cf3 Promise handle:
> cf3 Promise made by: ^.*\s+/scratch\s+.*defaults.*$
> cf3
> cf3 Comment: Remove default option
> cf3 .........................................................
> cf3
> cf3 -> This promise has already been verified
> cf3 -> No edit changes to file /etc/fstab need saving
> cf3
>
>
> (Nothing is done in iterations 2 and 3).
>
>
>
> Thanks in advance.
>
> --
> Jesse Becker
> NHGRI Linux support (Digicon Contractor)
> _______________________________________________
> Help-cfengine mailing list
> [email protected]
> https://cfengine.org/mailman/listinfo/help-cfengine
>
--
SY, Seva Gluschenko.
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