(RaspberryPi2)ubuntu@localhost:~$ cat /run/initramfs/resize-writable.log 
Checking that no-one is using this disk right now ... OK

Disk /dev/sda: 15 GiB, 16043212800 bytes, 31334400 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x0005e7c3

Old situation:

Device     Boot Start      End  Sectors Size Id Type
/dev/sda1        2048 12535807 12533760   6G 83 Linux

/dev/sda1: 
New situation:

Device     Boot Start      End  Sectors Size Id Type
/dev/sda1        2048 31334399 31332352  15G 83 Linux

The partition table has been altered.
Calling ioctl() to re-read partition table.
The kernel still uses the old table. The new table will be used at the next reboot or after you run partprobe(8) or kpartx(8).
Syncing disks.
Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Pass 5: Checking group summary information
writable: 135627/391680 files (0.0% non-contiguous), 546817/1566720 blocks