Add infrastructure for partition resizing

We add support to preexisting partitions to be resized by adjusting their
partition spec and then acting on the changes within the main partitioning
engine.  Keep track of what the maximum size for a preexisting partitition
is so that we don't have to check in the UI

Filesystems can claim to be resizable and implement the resize() method as
well as the getMinimumSize() method

1 files changed, 24 insertions, 2 deletions

diff --git a/autopart.py b/autopart.py
index b5b517542..f67019aa3 100644
--- a/autopart.py
+++ b/autopart.py
@@ -870,6 +870,23 @@ def setPreexistParts(diskset, requests):
         part = disk.next_partition()
         while part:
             if part.geom.start == request.start and part.geom.end == request.end:
+                # if the partition is being resized, we do that now
+                if request.targetSize is not None:
+                    startSec = part.geom.start
+                    endSec = part.geom.start + long(((request.targetSize * 1024L * 1024L) / disk.dev.sector_size)) - 1
+
+                    try:
+                        g = part.geom.duplicate()
+                        g.set_end(endSec)
+                        constraint = g.constraint_exact()
+                        part.set_geometry(constraint, startSec, endSec)
+                    except parted.error, msg:
+                        log.error("error setting geometry for partition %s: %s" %(partedUtils.get_partition_name(part), msg))
+                        raise PartitioningError, _("Error resizing partition %s.\n\n%s") %(partedUtils.get_partition_name(part), msg)
+
+                    if startSec != part.geom.start:
+                        raise PartitioningError, _("Start of partition %s was moved when resizing") %(partedUtils.get_partition_name(part),)
+
                 request.device = partedUtils.get_partition_name(part)
                 if request.fstype:
                     if request.fstype.getName() != request.origfstype.getName():
@@ -992,13 +1009,18 @@ def processPartitioning(diskset, requests, newParts):
     for request in requests.requests:
         if request.type == REQUEST_RAID:
             request.size = request.getActualSize(requests, diskset)
-        if request.type == REQUEST_VG:
+        elif request.type == REQUEST_VG:
             request.size = request.getActualSize(requests, diskset)
-        if request.type == REQUEST_LV:
+        elif request.type == REQUEST_LV:
 	    if request.grow:
 		request.setSize(request.getStartSize())
 	    else:
 		request.size = request.getActualSize(requests, diskset)
+        elif request.preexist:
+            # we need to keep track of the max size of preexisting partitions
+            # FIXME: we should also get the max size for LVs at some point
+            part = partedUtils.get_partition_by_name(diskset.disks, request.device)
+            request.maxResizeSize = partedUtils.getMaxAvailPartSizeMB(part)
 
 ##     print "disk layout after everything is done"
 ##     print diskset.diskState()