···

       
186
       
186
       
 
       
      echo "$acc"

     

       
187
       
187
       
 
       
    }

     

       
188
       
188
       
 
       


     

       
189
       
189
       
+
       
    # Approximative percentage of reserved space in an ext4 fs over 512MiB.

     

       
190
       
190
       
+
       
    # 0.05208587646484375

     

       
191
       
191
       
+
       
    #  × 1000, integer part: 52

     

       
192
       
192
       
+
       
    compute_fudge() {

     

       
193
       
193
       
+
       
      echo $(( $1 * 52 / 1000 ))

     

       
194
       
194
       
+
       
    }

     

       
195
       
195
       
+
       


     

       
189
       
196
       
 
       
    mkdir $out

     

       
190
       
197
       
 
       


     

       
191
       
198
       
 
       
    root="$PWD/root"

     
···

       
252
       
259
       
 
       
      ''}

     

       
253
       
260
       
 
       


     

       
254
       
261
       
 
       
      # Compute required space in filesystem blocks

     

       
255
       
255
       
-
       
      requiredSpace=$(find . ! -type d -exec 'du' '--apparent-size' '--block-size' "${blockSize}" '{}' ';' | cut -f1 | sum_lines)

     

       
256
       
256
       
-
       
      # Convert to bytes

     

       
257
       
257
       
-
       
      requiredSpace=$(( requiredSpace * ${blockSize} ))

     

       
262
       
262
       
+
       
      diskUsage=$(find . ! -type d -exec 'du' '--apparent-size' '--block-size' "${blockSize}" '{}' ';' | cut -f1 | sum_lines)

     

       
263
       
263
       
+
       
      # Each inode takes space!

     

       
264
       
264
       
+
       
      numInodes=$(find . | wc -l)

     

       
265
       
265
       
+
       
      # Convert to bytes, inodes take two blocks each!

     

       
266
       
266
       
+
       
      diskUsage=$(( (diskUsage + 2 * numInodes) * ${blockSize} ))

     

       
267
       
267
       
+
       
      # Then increase the required space to account for the reserved blocks.

     

       
268
       
268
       
+
       
      fudge=$(compute_fudge $diskUsage)

     

       
269
       
269
       
+
       
      requiredFilesystemSpace=$(( diskUsage + fudge ))

     

       
258
       
270
       
 
       


     

       
259
       
259
       
-
       
      diskSize=$(( requiredSpace  + additionalSpace ))

     

       
271
       
271
       
+
       
      diskSize=$(( requiredFilesystemSpace  + additionalSpace ))

     

       
260
       
272
       
 
       
      truncate -s "$diskSize" $diskImage

     

       
261
       
273
       
 
       


     

       
262
       
274
       
 
       
      printf "Automatic disk size...\n"

     

       
263
       
263
       
-
       
      printf "  Space needed: %d bytes\n" $requiredSpace

     

       
275
       
275
       
+
       
      printf "  Closure space use: %d bytes\n" $diskUsage

     

       
276
       
276
       
+
       
      printf "  fudge: %d bytes\n" $fudge

     

       
277
       
277
       
+
       
      printf "  Filesystem size needed: %d bytes\n" $requiredFilesystemSpace

     

       
264
       
278
       
 
       
      printf "  Additional space: %d bytes\n" $additionalSpace

     

       
265
       
279
       
 
       
      printf "  Disk image size: %d bytes\n" $diskSize

     

       
266
       
280
       
 
       
    '' else ''