src: report used and free partition data in bytes

Add "used_size" and "free_size" to the partition data and the
cache data.

Old response from ogClient for /cache/delete, /cache/fetch
and /image/restore:
{
  'cache': [
    {'name': 'windows.img', 'size': 2432370213, checksum: '5d4dcc677bc19f40a647d0002f4ade90'},
    {'name': 'linux.img', 'size': 243234534213, checksum: '3eb22f888f88a55ad954f55644e1192e'}
  ]
}

New response:
{
  'cache': {
    'used_size': 4520232322423,
    'free_size': 48273465287452945,
    'images': [
      {'name': 'windows.img', 'size': 2432370213, checksum: '5d4dcc677bc19f40a647d0002f4ade90'},
      {'name': 'linux.img', 'size': 243234534213, checksum: '3eb22f888f88a55ad954f55644e1192e'}
    ]
  }
}

3 files changed, 23 insertions, 18 deletions

diff --git a/src/live/ogOperations.py b/src/live/ogOperations.py
index c51215c..76999ba 100644
--- a/src/live/ogOperations.py
+++ b/src/live/ogOperations.py
@@ -61,7 +61,8 @@ class OgLiveOperations:
         part_setup['filesystem'] = ''
         part_setup['os'] = ''
         part_setup['size'] = str(cxt.nsectors * cxt.sector_size // 1024)
-        part_setup['used_size'] = '0'
+        part_setup['used_size'] = 0
+        part_setup['free_size'] = 0
         if not cxt.label:
             part_setup['code'] = '0'
         else:
@@ -84,11 +85,15 @@ class OgLiveOperations:
         if mount_mkdir(source, target):
             probe_result = os_probe(target)
             part_setup['os'] = probe_result
-            part_setup['used_size'] = get_usedperc(target)
+
+            total, used, free = shutil.disk_usage(target)
+            part_setup['used_size'] = used
+            part_setup['free_size'] = free
             umount(target)
         else:
             part_setup['os'] = ''
-            part_setup['used_size'] = '0'
+            part_setup['used_size'] = 0
+            part_setup['free_size'] = 0
 
 
         part_setup['disk_type'] = ''
@@ -111,9 +116,10 @@ class OgLiveOperations:
             part_setup['code'] = 'ca'
 
     def _get_cache_contents(self):
-        cache_contents = []
+        cache_contents = {}
 
-        if not mount_cache():
+        cache_mnt = mount_cache()
+        if not cache_mnt:
             return cache_contents
 
         img_dir = OG_CACHE_IMAGE_PATH
@@ -121,6 +127,8 @@ class OgLiveOperations:
         if not os.path.isdir(img_dir):
             return cache_contents
 
+        image_list = []
+
         for file_name in os.listdir(img_dir):
             file_path = os.path.join(img_dir, file_name)
 
@@ -151,10 +159,15 @@ class OgLiveOperations:
                 continue
 
             image_size = os.stat(file_path).st_size
-            cache_contents.append({
+            image_list.append({
                 'name': file_name,
                 'size': image_size,
                 'checksum': image_checksum})
+
+        total, used, free = shutil.disk_usage(cache_mnt)
+        cache_contents['used_size'] = used
+        cache_contents['free_size'] = free
+        cache_contents['images'] = image_list
         return cache_contents
 
     def _get_boot_entry_data(self):
diff --git a/src/utils/fs.py b/src/utils/fs.py
index 3de8ee2..381f65b 100644
--- a/src/utils/fs.py
+++ b/src/utils/fs.py
@@ -81,17 +81,6 @@ def umount_all():
             umount(path)
 
 
-def get_usedperc(mountpoint):
-    """
-    Returns percetage of used filesystem as decimal number.
-    """
-    try:
-        total, used, free, perc = psutil.disk_usage(mountpoint)
-    except FileNotFoundError:
-        return '0'
-    return str(perc)
-
-
 def ogReduceFs(disk, part):
     """
     Shrink filesystem of a partition. Supports ext4 and ntfs partitions.
diff --git a/src/virtual/ogOperations.py b/src/virtual/ogOperations.py
index 763c126..836967a 100644
--- a/src/virtual/ogOperations.py
+++ b/src/virtual/ogOperations.py
@@ -286,6 +286,7 @@ class OgVirtualOperations:
                             part['os'] = ''
                             part['size'] = 0
                             part['used_size'] = 0
+                            part['free_size'] = 0
                             part['virt-drive'] = ''
                             continue
                         g = guestfs.GuestFS(python_return_dict=True)
@@ -332,7 +333,8 @@ class OgVirtualOperations:
                                    'filesystem': '',
                                    'os': '',
                                    'size': int(free_disk / 1024),
-                                   'used_size': int(100 * used_disk / total_disk)}],
+                                   'used_size': used_disk,
+                                   'free_size': free_disk}],
                     'partition_setup': []}
             for i in range(4):
                 part_json = {'disk': 1,
@@ -342,6 +344,7 @@ class OgVirtualOperations:
                              'os': '',
                              'size': 0,
                              'used_size': 0,
+                             'free_size': 0,
                              'virt-drive': ''}
                 data['partition_setup'].append(part_json)
             with open(self.OG_PARTITIONS_CFG_PATH, 'w+') as f: