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Document workings of calibrate_partition() method 

Document the reasons why GParted_Core::calibrate_partition() needs to
reload the device name and partition boundaries from libparted.
This commit is contained in:
Mike Fleetwood 2015-01-13 17:01:51 +00:00 committed by Curtis Gedak
parent 6c333f845c
commit b293a464cb
1 changed files with 26 additions and 0 deletions
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26
src/GParted_Core.cc
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@ -3167,8 +3167,34 @@ bool GParted_Core::calibrate_partition( Partition & partition, OperationDetail &
if ( lp_partition )//FIXME: add check to see if lp_partition ->type matches partition .type..
{
// Re-add the real partition path from libparted.
//
// When creating a copy operation the list of paths for
// the partition object was set to ["copy of /dev/SRC"] to
// display in the UI before the operations are applied.
// When pasting into an existing partition, this re-adds
// the real path to the start of the list making it
// ["/dev/DST", "copy of /dev/SRC"]. This provides the
// real path for any file system specific tools needed
// during the copy operation. Such as file system check
// and grow steps added when the source and destination
// aren't identical sizes or when file system specific
// tools are used to perform the copy as for XFS or recent
// EXT2/3/4 tools.
//
// FIXME: Having this work just because "/dev/DST" happens
// to sort before "copy of /dev/SRC" is ugly! Probably
// have a separate display path which can be changed at
// will without affecting the list of real paths for the
// partition.
partition .add_path( get_partition_path( lp_partition ) ) ;
// Reload the partition boundaries from libparted to
// ensure that GParted knows what the actual partition
// boundaries are before applying the next operation.
// Necessary when the previous operation in the sequence
// was a resize/move operation where GParted may have only
// estimated where libparted would move the boundaries to.
partition .sector_start = lp_partition ->geom .start ;
partition .sector_end = lp_partition ->geom .end ;