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authorDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2019-05-20 16:02:18 +0200
committerDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2019-05-20 16:02:18 +0200
commita2f477d76f8961f250b93f9aee91a5abf2e7c296 (patch)
tree3d49893c9dd54d7579c0ddb98b03fde2996d2262
parentce33fefd5c0e4238855551e6f5f75fc106f141b7 (diff)
Update README
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
-rw-r--r--README34
1 files changed, 16 insertions, 18 deletions
diff --git a/README b/README
index af7dd08..11989a7 100644
--- a/README
+++ b/README
@@ -17,14 +17,13 @@ etc... actually exist when packing a SquashFS image. The only thing that
really has to exist are the input _files_ that can be placed arbitrarily in
the file system by specifying input and target locations.
+An SELinux labeling file can be specified to add SELinux tags.
+
All directory entries are sorted by name and processed sequentially. All time
stamps in the SquashFS image are set to a command line specified value (or 0
by default). Thus the entire process should be deterministic, i.e. same input
produces byte-for-byte the same output.
-In addition to the `gen_init_cpio` style file listing, an SELinux labeling
-file can be specified to add SELinux tags.
-
The `rdsquashfs` program can read a SquashFS image and produce file listings,
extract individual files or entire sub trees of the image to a desired
@@ -36,7 +35,7 @@ location.
The mksquashfs utility is semi-broken and generally a PITA to work with.
-For the typically use case of SquashFS (i.e. as rootfs for a live distro or an
+For the typical use case of SquashFS (i.e. as rootfs for a live distro or an
embedded system), it should be blindingly obvious that I might want to micro
manage what goes into the file system, that UIDs/GIDs of the host system are
garbage inside the image and that setting the desired permissions (e.g. suid)
@@ -75,21 +74,20 @@ list appears to be about as dead as SourceForge that hosts it.
Limitations
***********
-The entire code base is at the moment fairly fresh and has been hacked together
-in a weekend or two. So naturally, the feature set it implements is currently
-quite limited.
-
-At the moment, the following things are still missing:
+At the moment, the following things still require some work:
+ - documentation
+ - testing
- extended attributes
- currently limited to SELinux labeling only
- - internally, all key strings and all value strings are deduplicated.
- - the entire set xattrs per inode is deduplicated.
- - The key/value strings data are repeated again when writing it out.
- - SquashFS also supports deduplicating values through "out of line"
+ - rdsquashfs ignores them entirely
+ - SquashFS supports deduplicating values through "out of line"
storage but this is currently not used yet.
- - sparse files
- - hard links
- - NFS export tables
- - compressor options
- - support for extracting SquashFS < 4.0
+ - empty directories cannot have xattrs. The way I understand it, this is a
+ design flaw in SquashFS. I hope I'm missing something here.
+ - sparse files (not implemented yet)
+ - hard links (not implemented yet; do we even want this?)
+ - NFS export tables (not implemented yet)
+ - compressor options (stub code exists, implementation missing, command line
+ not implemented yet)
+