Squashfs

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|subcat=Filesystem
 
|subcat=Filesystem
 
|extensions={{ext|sfs}}<ref>[https://github.com/plougher/squashfs-tools/issues/259 What are the commonly accepted file name extension for squashfs? #259 - GitHub]</ref>
 
|extensions={{ext|sfs}}<ref>[https://github.com/plougher/squashfs-tools/issues/259 What are the commonly accepted file name extension for squashfs? #259 - GitHub]</ref>
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|wikidata={{wikidata|Q389314}}
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|compression=lossless, optional
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|magic=[https://github.com/file/file/blob/master/magic/Magdir/filesystems#L2194 68 73 71 73] (little-endian)<br />[https://github.com/file/file/blob/master/magic/Magdir/filesystems#L2191 73 71 73 68] (big-endian)
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|developed by=Phillip Lougher<ref>[https://sourceforge.net/p/squashfs/mailman/message/67563/ (Squashfs-announce) Squashfs1.2 released - 2003-03-13 05:30:45 - SourceForge mailman]</ref>
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|maintained by=Phillip Lougher
 
|released=2002
 
|released=2002
 
}}
 
}}
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'''Squashfs''' is a compressed read-only filesystem for Linux. Typically used as a "live image" for booting Linux off a removable storage (e.g. USB, CD/DVD), minus components like the bootloader, kernel and initramfs.<ref>[https://fedoraproject.org/wiki/Changes/EROFSforLiveMedia EROFS For Live Media - Fedora Project]</ref> It is also used in modern AppImage,<ref>[[wikipedia:AppImage#History|History of AppImage - Wikipedia]]</ref>, or [[Snap]]<ref>[[wikipedia:Snap_(software)#Support|Snap - support section - Wikipedia]]</ref> as a way portable software distribution on Linux. Squashfs can also be used to store other data, such as disk images.<ref>[https://www.foo.be/2017/01/Squashfs_As_A_Forensic_Container Squashfs As a Forensic Container - foo.be]</ref> Under Windows, Squashfs contents can be opened/extracted via [[7-Zip]].<ref>[https://stackoverflow.com/a/36877207 python2.7 How to handle squashfs in Windows - StackOverflow]</ref>
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'''Squashfs''' is read-only filesystem that features optional compression<ref>[https://github.com/plougher/squashfs-tools/issues/206 <nowiki>[</nowiki>feature request<nowiki>]</nowiki>: mksquashfs: Add --no-compression flag to disable all compression #206 - squashfs-tools - GitHub]</ref> for Linux. Typically used as a "live image" for booting Linux off a removable storage (e.g. USB, CD/DVD), minus components like the bootloader, kernel and initramfs.<ref>[https://fedoraproject.org/wiki/Changes/EROFSforLiveMedia EROFS For Live Media - Fedora Project]</ref> It is also used in:
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* Embedded devices like network routers<ref>[https://openwrt.org/docs/techref/flash.layout The OpenWrt Flash Layout - Technical Reference - openwrt.org]</ref><ref>[https://github.com/ReFirmLabs/binwalk/issues/301 problems extracting squashfs-image #301 - binwalk - GitHub]</ref><ref>[https://embeddedbits.org/reverse-engineering-my-routers-firmware-with-binwalk-embeddedbits/ Reverse engineering my router's firmware with binwalk - embeddedbits.org]</ref>, or in Android powered devices.<ref>[https://android.stackexchange.com/questions/258236/squashfs-explanation-for-android-system SquashFS explanation for Android system - Android Enthusiasts - Stack Exchange]</ref>
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* Modern AppImage,<ref>[[wikipedia:AppImage#History|History of AppImage - Wikipedia]]</ref>, or [[Snap]]<ref>[[wikipedia:Snap_(software)#Support|Snap - support section - Wikipedia]]</ref> as a way portable software distribution on Linux.
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* Storage of other data, such as disk images.<ref>[https://www.foo.be/2017/01/Squashfs_As_A_Forensic_Container Squashfs As a Forensic Container - foo.be]</ref>
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Under [[Microsoft Windows|Windows]], SquashFS contents can be opened/extracted via [[7-Zip]].<ref>[https://stackoverflow.com/a/36877207 python2.7 How to handle squashfs in Windows - StackOverflow]</ref>
  
 
See also [[cramfs]].
 
See also [[cramfs]].
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== Identification ==
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SquashFS files created on little-endian machines begins with hexadecimal {{magic|68 73 71 73}}, which translates to "hsqs" in ASCII. SquashFS files created on big-endian machines with hexadecimal {{magic|73 71 73 68}}, which translates to "sqsh" in ASCII.
  
 
== Examples ==
 
== Examples ==
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== Sample files ==
 
== Sample files ==
 
* {{DexvertSamples|archive/squashFS}}
 
* {{DexvertSamples|archive/squashFS}}
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* [https://discmaster.textfiles.com/search?mode=deep&extension=.sfs&format=squashFS Search results for .sfs extension and is squashFS format - Discmaster.textfiles.com]
  
 
== Links ==
 
== Links ==
 
* [[Wikipedia: SquashFS]]
 
* [[Wikipedia: SquashFS]]
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* [http://squashfs.sourceforge.net/ Squashfs website]
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* [https://squashfs.sourceforge.net/ Squashfs website]
 
* [https://sourceforge.net/projects/squashfs/ SourceForge project page]
 
* [https://sourceforge.net/projects/squashfs/ SourceForge project page]
 
* [https://github.com/plougher/squashfs-tools GitHub project page]
 
* [https://github.com/plougher/squashfs-tools GitHub project page]

Latest revision as of 06:55, 20 August 2025

File Format
Name Squashfs
Ontology
Extension(s) .sfs[1]
Wikidata ID Q389314
Compression lossless, optional
Magic Bytes 68 73 71 73 (little-endian)
73 71 73 68 (big-endian)
Developed By Phillip Lougher[2]
Maintained By Phillip Lougher
Released 2002

Squashfs is read-only filesystem that features optional compression[3] for Linux. Typically used as a "live image" for booting Linux off a removable storage (e.g. USB, CD/DVD), minus components like the bootloader, kernel and initramfs.[4] It is also used in:

  • Embedded devices like network routers[5][6][7], or in Android powered devices.[8]
  • Modern AppImage,[9], or Snap[10] as a way portable software distribution on Linux.
  • Storage of other data, such as disk images.[11]

Under Windows, SquashFS contents can be opened/extracted via 7-Zip.[12]

See also cramfs.

Contents

[edit] Identification

SquashFS files created on little-endian machines begins with hexadecimal 68 73 71 73, which translates to "hsqs" in ASCII. SquashFS files created on big-endian machines with hexadecimal 73 71 73 68, which translates to "sqsh" in ASCII.

[edit] Examples

Create a Squashfs (file system) image from current/present directory and output it into its parent directory: 

 $ mksquashfs . ../example.squashfs -b 1048576 -comp xz -Xdict-size 100%

Open a Squashfs image (as root) from present directory and have its contents visible in /mnt: 

 # mount example.squashfs /mnt

Open a Squashfs image (as user) from present directory and have its contents visible in /mnt/temp: 

 $ squashfuse example.squashfs /mnt/temp

[edit] Software

[edit] Sample files

[edit] Links

[edit] References

  1. ↑ What are the commonly accepted file name extension for squashfs? #259 - GitHub
  2. ↑ (Squashfs-announce) Squashfs1.2 released - 2003-03-13 05:30:45 - SourceForge mailman
  3. ↑ [feature request]: mksquashfs: Add --no-compression flag to disable all compression #206 - squashfs-tools - GitHub
  4. ↑ EROFS For Live Media - Fedora Project
  5. ↑ The OpenWrt Flash Layout - Technical Reference - openwrt.org
  6. ↑ problems extracting squashfs-image #301 - binwalk - GitHub
  7. ↑ Reverse engineering my router's firmware with binwalk - embeddedbits.org
  8. ↑ SquashFS explanation for Android system - Android Enthusiasts - Stack Exchange
  9. ↑ History of AppImage - Wikipedia
  10. ↑ Snap - support section - Wikipedia
  11. ↑ Squashfs As a Forensic Container - foo.be
  12. ↑ python2.7 How to handle squashfs in Windows - StackOverflow
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