squashfs-tools-ng.git/lib/tar, branch v1.0.1

Cleanup: sqfs2tar: break up and simplify the repacking code

2020-05-30T15:49:40+00:00

- Move the xattr extraction and repacking to xattr.c - Don't on-the-fly delete the tar xattr list, use the function from libtar.a - Split minor tasks into static helper functions - creating a libtar xattr struct from libsqfs xattr data - finding a hard link entry from current path and inode number Signed-off-by: David Oberhollenzer

libtar: fix size computation of PAX line length

2020-05-18T12:00:31+00:00

This commit attempts to fix the following two problems: - The number of digits computation returning an off-by-one result if the number is 10, or the resulting digit string starts with "10". This results in one-too-many padding bytes, corrupting the rest of the archive since the headers now don't start at multiples of 512 anymore. - Adding the line length prefix affects the line length (duh). If it grows far enough to require more digits, the result is a similar problem. This is a converging series that we need to compute the limit of. Unit tests for this still need to be added. Or maybe I can convince a bored undergrad student to provide an induction proof. Signed-off-by: David Oberhollenzer

Skip PAX global headers

2020-04-22T12:22:44+00:00

Tar archives can contain set two kinds of PAX headers: - local headers that modify the attributes of the next file - global headers that set defaults for all files The later is used "... not widely used", according to tar(5) and has been deliberately not implemented. Some programs (e.g. git-archive) *do* generate them (in the case of git, it stores the commit hash). This commit adds a code path that skips a PAX global header entirely and resumes tar parsing, instead of erroneusly reporting it as an entry. Signed-off-by: David Oberhollenzer

Remove some configure time sizeof checks

2020-04-17T21:52:52+00:00

In libtar, the sizeof time_t checked when trying to store a time value. It is pointless using the preprocessor here, as we can simply do an if (sizeof(time_t) < ...) check and the compiler will take care optimizing away one or the other branch. After changing the libtar check and the corresponding unit tests, the sizeof check can be removed from configure.ac, along with other unused sizeof checks. Signed-off-by: David Oberhollenzer

Cleanup: split read_header.c in libtar.a

2020-04-17T21:31:32+00:00

Simply moving the pax header decoding to a separate file and splitting out the common helper functions should be a good start. Signed-off-by: David Oberhollenzer

Cleanup pax header parser a little

2020-02-28T15:11:19+00:00

This commit tries to untangle the logic of parsing and sanitizing the pax header length field and the associated bounds checks. Signed-off-by: David Oberhollenzer

Add libtar.a function to create hardlink records

2019-12-23T12:55:38+00:00

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

Fix tar GNU sparse header parsing

2019-12-15T01:31:54+00:00

Extract the filename correctly. Signed-off-by: David Oberhollenzer

Better support for reading/writing non-ASCII xattr values from/to tar

2019-12-13T14:49:00+00:00

Signed-off-by: David Oberhollenzer