+++ mkdir -p ./files
+++ mkdir -p ./rootImage/nix/store
+++ xargs -I % cp -a --reflink=auto % -t ./rootImage/nix/store/
+++ GLOBIGNORE=.:..
+++ shopt -u dotglob
+++ cp /nix/store/yz72vaf9jwgpj8vzdaz863bz7kzn2cqn-closure-info/registration ./rootImage/nix-path-registration
+++ touch /nix/store/qh7791g9jigiq3cxj2my49ykmpy1yrn1-btrfs-fs.img
+++ faketime -f '1970-01-01 00:00:01' fakeroot mkfs.btrfs -L hvwroot -U 44444444-4444-4444-8888-888888888888 -r ./rootImage --shrink /nix/store/qh7791g9jigiq3cxj2my49ykmpy1yrn1-btrfs-fs.img
btrfs-progs v7.1
See https://btrfs.readthedocs.io for more information.

NOTE: default settings have changed in version 6.19 (supported since linux 6.1):
      - enable block-group-tree (-O bgt)

Rootdir from:       /build/rootImage
  Compress:         no
  Shrink:           yes
Label:              hvwroot
UUID:               44444444-4444-4444-8888-888888888888
Node size:          16384
Sector size:        4096	(CPU page size: 4096)
Filesystem size:    5.47GiB
Block group profiles:
  Data:             single            4.95GiB
  Metadata:         DUP             256.00MiB
  System:           DUP               8.00MiB
SSD detected:       no
Zoned device:       no
Features:           extref, skinny-metadata, no-holes, free-space-tree, block-group-tree
Checksum:           crc32c
Number of devices:  1
Devices:
   ID        SIZE  PATH                                                    
    1     5.47GiB  /nix/store/qh7791g9jigiq3cxj2my49ykmpy1yrn1-btrfs-fs.img

+++ btrfs check /nix/store/qh7791g9jigiq3cxj2my49ykmpy1yrn1-btrfs-fs.img
Opening filesystem to check...
Checking filesystem on /nix/store/qh7791g9jigiq3cxj2my49ykmpy1yrn1-btrfs-fs.img
UUID: 44444444-4444-4444-8888-888888888888
[1/8] checking log skipped (none written)
[2/8] checking root items
[3/8] checking extents
[4/8] checking free space tree
[5/8] checking fs roots
[6/8] checking only csums items (without verifying data)
[7/8] checking root refs
[8/8] checking quota groups skipped (not enabled on this FS)
found 3809513472 bytes used, no error found
total csum bytes: 3622212
total tree bytes: 100368384
total fs tree bytes: 90128384
total extent tree bytes: 4259840
btree space waste bytes: 16323381
file data blocks allocated: 3709145088
 referenced 3709145088
+++ '[' ']'
++ return
+ exitHandler
+ exitCode=0
+ set +e
+ '[' -n '' ']'
+ ((  0 != 0  ))
+ runHook exitHook
+ local hookName=exitHook
+ shift
+ local 'hooksSlice=exitHooks[@]'
+ local hook
+ for hook in "_callImplicitHook 0 $hookName" ${!hooksSlice+"${!hooksSlice}"}
+ _logHook exitHook '_callImplicitHook 0 exitHook'
+ [[ -z 2 ]]
+ local hookKind=exitHook
+ local 'hookExpr=_callImplicitHook 0 exitHook'
+ shift 2
+ declare -F '_callImplicitHook 0 exitHook'
+ type -p '_callImplicitHook 0 exitHook'
+ [[ _callImplicitHook 0 exitHook != _callImplicitHook* ]]
+ _eval '_callImplicitHook 0 exitHook'
+ declare -F '_callImplicitHook 0 exitHook'
+ eval '_callImplicitHook 0 exitHook'
++ _callImplicitHook 0 exitHook
++ local def=0
++ local hookName=exitHook
++ declare -F exitHook
++ type -p exitHook
++ '[' -n '' ']'
++ return 0
+ return 0
+ return 0