创建包含 APFS 文件系统的原始图像非常简单：
$ hdiutil create -megabytes 1 -layout NONE -fs apfs -volname unicode unicode.dmg
created: /Users/daniel/test/apfs/unicode.dmg
现在我想将要执行的特定测试的文件放入其中，但似乎无法附加它：
$ hdiutil attach unicode.dmg
hdiutil: attach failed - no mountable file systems
诊断：
$ hdiutil imageinfo unicode.dmg
nx_kernel_mount:1366: checkpoint search: largest xid 2, best xid 2 @ 3
nx_kernel_mount:1366: checkpoint search: largest xid 2, best xid 2 @ 3
nx_kernel_mount:1366: checkpoint search: largest xid 2, best xid 2 @ 3
nx_kernel_mount:1366: checkpoint search: largest xid 2, best xid 2 @ 3
nx_kernel_mount:1366: checkpoint search: largest xid 2, best xid 2 @ 3
nx_kernel_mount:1366: checkpoint search: largest xid 2, best xid 2 @ 3
Backing Store Information:
URL: file:///Users/tester/test/apfs/unicode.dmg
Name: unicode.dmg
Class Name: CBSDBackingStore
Class Name: CRawDiskImage
Checksum Type: none
Size Information:
Total Bytes: 1048576
Compressed Ratio: 1
Sector Count: 2048
Total Non-Empty Bytes: 1048576
Compressed Bytes: 1048576
Total Empty Bytes: 0
Format: UDRW
Format Description: raw read/write
Checksum Value:
Properties:
Encrypted: false
Kernel Compatible: true
Checksummed: false
Software License Agreement: false
Partitioned: false
Compressed: no
Segments:
0: /Users/tester/test/apfs/unicode.dmg
partitions:
partition-scheme: none
block-size: 512
appendable: false
partitions:
0:
partition-name: whole disk
partition-start: 0
partition-synthesized: true
partition-length: 2048
partition-hint: unknown partition
partition-filesystems:
APFS: Untitled
burnable: false
Resize limits (per hdiutil resize -limits):
min cur max
2048 2048 2048
这里的输出似乎不太可靠，因为块大小和卷标是错误的。所以我不确定发生了什么。APFS 是否是那些只在某些特定条件下才会挂载的东西之一？如果是，什么条件？或者有没有办法解决这个问题来挂载我已经拥有的一个映像？