[Junzheng T31] decompression and packaging of read-only rootfs file system squashfs

see squashfs Compress information

#  install mksquashfs Tools 
apt install mtd-utils
#  View compressed information 
 unsquashfs -s root-glibc-toolchain4.7.2-1.1.squashfs
#  Show 
Found a valid SQUASHFS 4:0 superblock on root-glibc-toolchain4.7.2-1.1.squashfs.
Creation or last append time Tue Feb 23 08:42:12 2021
Filesystem size 1582.11 Kbytes (1.55 Mbytes)
Compression xz
Block size 131072
Filesystem is exportable via NFS
Inodes are compressed
Data is compressed
Fragments are compressed
Always-use-fragments option is not specified
Xattrs are compressed
Duplicates are removed
Number of fragments 5
Number of inodes 313
Number of ids 2

You can see the compression method xz,blocksize131072

decompression

unsquashfs root-glibc-toolchain4.7.2-1.1.squashfs Will unpack to the current directory squashfs-root Folder

unsquashfs root-glibc-toolchain4.7.2-1.1.squashf

pack

mksquashfs rootfs[ Input file plus ] rootfs.squashfs[ Output file name ] -comp xz

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