GNU bug report logs - #24167
Way to tell parted to resize partition to max size?

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Petter Reinholdtsen <pere <at> hungry.com>
To: bug-parted <at> gnu.org
Subject: Way to tell parted to resize partition to max size?
Date: Sat, 06 Aug 2016 08:58:07 +0200

Hi.

I checked the manual page, texinfo documentation and the source, but
were unable to find a way to do this.

Is there a way to tell parted to resize a partition to the maximum
possible.  In other words, to the end of the disk or until it meet a new
partition on the disk geometry?

With btrfs I can do like this to extend to the end of the partition:

  btrfs filesystem resize max /

Could parted be changed to allow something similar?  Perhaps

  resizepart 1 max

I had a look at the code, and suspect something like this might work,
but I do not know the parted inner workings enough to figure out where
to get the max_end value.


--- parted-3.2.orig/parted/parted.c
+++ parted-3.2/parted/parted.c
@@ -1522,6 +1522,7 @@ do_resizepart (PedDevice** dev, PedDisk*
         PedSector               start, end, oldend;
         PedGeometry             *range_end = NULL;
         PedConstraint*          constraint;
+        char                    *end_raw;
         int rc = 0;
 
         if (!disk) {
@@ -1543,8 +1544,12 @@ do_resizepart (PedDevice** dev, PedDisk*
 
         start = part->geom.start;
         end = oldend = part->geom.end;
-        if (!command_line_get_sector (_("End?"), *dev, &end, &range_end, NULL))
-                goto error;
+        if (!command_line_get_sector (_("End?"), *dev, &end, &range_end, &end_raw))
+                if (0 == strcmp('max', end_raw) {
+                        end = max_end;
+                } else {
+                        goto error;
+                }
         /* Do not move start of the partition */
         constraint = constraint_from_start_end_fixed_start (*dev, start, range_end);
         if (!ped_disk_set_partition_geom (disk, part, constraint,



-- 
Happy hacking
Petter Reinholdtsen

Message #8 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Tom Roche <Tom_Roche <at> pobox.com>
To: bug-parted <at> gnu.org, 
Subject: Re: bug#24167: Way to tell parted to resize partition to max size?
Date: Fri, 12 Aug 2016 16:36:21 -0700

[footnotes after .sig]

Petter Reinholdtsen[1]
> With btrfs I can do like this to extend to the end of the partition:

>   btrfs filesystem resize max /

> Could parted be changed to allow something similar?  Perhaps

>   resizepart 1 max

WARNING: I have not tried this! but I believe you want `-1`, e.g.

    resizepart 1 -1

I am basing this on the knowledge that

    sudo parted ${DRIVE_DEV} --script -- mkpart primary 0 -1

I concur (presuming it works :-) that note of the semantics of `-1` should be added to the manual, e.g. here[2] and here[3]. Note the manual[2] does state clearly

>> When growing a partition you will want to grow the filesystem afterwards, but
>> when shrinking, you need to shrink the filesystem before the partition. 

HTH, Tom Roche <Tom_Roche <at> pobox.com>

[1]: http://lists.gnu.org/archive/html/bug-parted/2016-08/msg00001.html
[2]: https://www.gnu.org/software/parted/manual/parted.html#resizepart
[3]: https://www.gnu.org/software/parted/manual/parted.html#mkpart

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