squashfs-tools-ng.git/lib/fstree, branch v1.0.5

libfstree: guard against link count and inode number overflow

2021-06-25T15:37:56+00:00

If the hard link counter or the inode number counter overflow the maximum representable value (for SquashFS 16 bit and 32 bit respecitively), abort with an error message. Signed-off-by: David Oberhollenzer

Fix normalization of slashes in filenames

2020-12-29T11:39:17+00:00

All paths were canonicalized internally, which includes filtering sequences of slashes and converting backslashes to slashes. Furthermore, when unpacking files, filenames are sanity checked and rejected if they contain forward OR backward slashes. This is a problem on Unix-like systems, where files containing backslashes are a legitimate use case (*cough* SystemD *cough*). This patch removes the backslash conversion from the canonicalization and modifies the sanity check to reject backslashes only on Windows. Signed-off-by: David Oberhollenzer

Simplify hard link handling

2019-12-23T19:19:46+00:00

- For now, enforce that hard links don't point to a directories. - Instead of doing the swaping trickery, just reorder the flat list and hand out new inode numbers. Signed-off-by: David Oberhollenzer

Minor cleanup in inode allocation

2019-12-23T14:37:00+00:00

- Remove unnecessary counter argument, we already have the total count. - Remove the return status, there is no failure branch. Signed-off-by: David Oberhollenzer

Bring back the flat list of inodes in libfstree

2019-12-22T23:50:00+00:00

It makes further processing simpler and doesn't leak the abstraction into upper layers. Signed-off-by: David Oberhollenzer

Add hard link support to gensquashfs and tar2sqfs

2019-12-22T21:07:44+00:00

In libtar, set a special flag if the header is actually a hard link. In tar2sqfs, create a hard link node and skip the rest for hard links. Also refues to set the root attributes from a hard link, it may refere to a node that we have missed earlier, there is nothing else that we can do here. In fstree_from_file, add a "link" command for adding hard links. Signed-off-by: David Oberhollenzer

Add basic support for handling and serializing hard links

2019-12-22T21:07:44+00:00

In libfstree, add a function to add a hard link to the fstree. The hard links stores the target in the data.target field, canonicalizes the target and sets a sentinel mode. A second function is used to resolve link, i.e. replacing it with a direct pointer, setting another sentinel mode and increasing the targets link count. The post process function tries to resolve unresolved hard links and only allocates inode numbers for nodes that aren't hard links. If the target node of a hard link does not have an inode number yet, the two need to be swapped, since this is also the order in which they are serialized. The serialization function in libcommon simply has to skip hard link nodes and when writing directory entries, use the inode num/ref of the target node. Signed-off-by: David Oberhollenzer

Split the libfstree add_by_path tree traversal function out

2019-12-19T15:34:10+00:00

Signed-off-by: David Oberhollenzer

Add an explicit link count to the fstree nodes

2019-12-18T16:40:49+00:00

Gets initialized to 2 for directories, 1 for all other types. The count of the parent node is automatically incremented. Signed-off-by: David Oberhollenzer

Rename fstree "slink_target" to "target"

2019-12-18T16:04:54+00:00

Signed-off-by: David Oberhollenzer