···

       
33
       
33
       
 
       
      echo "Creating an EXT4 image of $bytes bytes (numInodes=$numInodes, numDataBlocks=$numDataBlocks)"

     

       
34
       
34
       
 
       


     

       
35
       
35
       
 
       
      truncate -s $bytes $out

     

       
36
       
36
       
-
       
      faketime "1970-01-01 00:00:00" mkfs.ext4 -L ${volumeLabel} -U 44444444-4444-4444-8888-888888888888 $out

     

       
36
       
36
       
+
       
      faketime -f "1970-01-01 00:00:01" mkfs.ext4 -L ${volumeLabel} -U 44444444-4444-4444-8888-888888888888 $out

     

       
37
       
37
       
 
       


     

       
38
       
38
       
 
       
      # Populate the image contents by piping a bunch of commands to the `debugfs` tool from e2fsprogs.

     

       
39
       
39
       
 
       
      # For example, to copy /nix/store/abcd...efg-coreutils-8.23/bin/sleep:

     
···

       
76
       
76
       
 
       


     

       
77
       
77
       
 
       
          echo sif $file gid 30000 # chgrp to nixbld

     

       
78
       
78
       
 
       
        done

     

       
79
       
79
       
-
       
      ) | faketime "1970-01-01 00:00:00" debugfs -w $out -f /dev/stdin > errorlog 2>&1

     

       
79
       
79
       
+
       
      ) | faketime -f "1970-01-01 00:00:01" debugfs -w $out -f /dev/stdin > errorlog 2>&1

     

       
80
       
80
       
 
       


     

       
81
       
81
       
 
       
      # The debugfs tool doesn't terminate on error nor exit with a non-zero status. Check manually.

     

       
82
       
82
       
 
       
      if egrep -q 'Could not allocate|File not found' errorlog; then