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, 18 insertions, 0 deletions

diff --git a/partRequests.py b/partRequests.py
index e11327810..c5655e00f 100644
--- a/partRequests.py
+++ b/partRequests.py
@@ -155,6 +155,9 @@ class RequestSpec:
         self.encryption = None
         """An optional LUKSDevice() describing block device encryption."""
 
+        self.targetSize = None
+        """Size to resize to"""
+
     def __str__(self):
         if self.fstype:
             fsname = self.fstype.getName()
@@ -212,6 +215,9 @@ class RequestSpec:
         if self.fslabel:
             entry.setLabel(self.fslabel)
 
+        if self.targetSize and self.fstype.isResizable():
+            entry.setResizeTarget(self.targetSize, self.size)
+
         return entry
 
     def setProtected(self, val):
@@ -576,6 +582,18 @@ class PreexistingPartitionSpec(PartitionSpec):
                                mountpoint = mountpoint, preexist = 1)
         self.type = REQUEST_PREEXIST
 
+        self.maxResizeSize = None
+        """Maximum size of this partition request"""
+
+    def getMaximumResizeMB(self):
+        if self.maxResizeSize is not None:
+            return self.maxResizeSize
+        log.warning("%s doesn't have a max size set" %(self.device,))
+        return MAX_PART_SIZE
+
+    def getMinimumResizeMB(self):
+        return self.fstype.getMinimumSize(self.device)
+
 class RaidRequestSpec(RequestSpec):
     """Request to represent RAID devices."""