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2019-07-02Fix directory index offset calculationDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-07-01cleanup: split tar code up, remove some duplicationsDavid Oberhollenzer
This commit attempts to split some of the monolitic tar parsing code up into multiple functions in seperate files. Also, some code duplication (like reading a record into memory which was implemented twice) is removed. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-07-01Make sure fragment and id tables are initializedDavid Oberhollenzer
In case the tables are not completely filled by reading from the squashfs image. Bug found using scan-build. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-07-01Remove unused variable assignment from tar header writerDavid Oberhollenzer
Mainly to make scan-build happy. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-07-01Remove never used overflow error message in fstree_from_fileDavid Oberhollenzer
Bug found using scan-build. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-07-01Fix double free in GNU tar sparse file parserDavid Oberhollenzer
The intention was to free the temporary object in addition to the list. Since the temp pointer is also used for iterating the list, this resulted in a double free instead of the intended. This commit fixes the double free by replacing the recycled variable based list free with the helper function intended to do this. Bug found using scan-build. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-07-01Fix pax header parser to bail if parsing a number failsDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-07-01Fix uninitialize return status in fstree_relabel_selinuxDavid Oberhollenzer
Should the inode table theoretically be empty, the function returns an undefined value. This commit fixes that case by initializing the return status to 0, so it returns success status in that case. Bug found using scan-build. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-07-01Fix use of uninitialized xattr structureDavid Oberhollenzer
The refactor of the xattr table grow code merged all allocation code paths into realloc(), including the initial allocation. This means that the xattr structure is used uninitialized. This commit makes sure the reallocated structure is alwayes cleared. Bug found using scan-build. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-07-01Fix alloca'd memory being freed in fstree_from_dirDavid Oberhollenzer
Most code path that use 'extra' allocate it using calloc/malloc/strdup and then converge into a common path that uses free() on extra. This commit removes a stray one that uses alloca for symlink targets, so we don't free() a stack buffer further down in the common path. Bug found using scan-build. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-07-01Fix memory leak in gzip compressorDavid Oberhollenzer
Don't allocate the compressor structure twice. Bug found using scan-build. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-06-30Add support for gnu pax sparse file formats 0.1 and 1.0David Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-06-30Add support for gnu pax sparse file format 0.0David Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-06-30libtar: clarify actual size vs on-disk record sizeDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-06-30Add support for repacking condensed sparse filesDavid Oberhollenzer
This commit broadly does the following things: - Rename and move the sparse mapping structure to libutil - Add a function to the data writer for writing condensed versions of sparse files, given the mapping. - This shares code with the already existing function for regular files. The shared code is moved to a common helper function. - Add support to tar2sqfs for repacking sparse files. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-06-30tar reader: also store condensed size of sparse filesDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-06-29Add support for reading old style GNU sparse tar file formatDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-06-29tar reader: propperly cleanup on failureDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-06-28Add support for unpacking sparse files as sparse filesDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-06-28Add support for packing sparse filesDavid Oberhollenzer
This commit adds support for packing sparse files into squashfs images as follows: - In the data writer: simply detect zero blocks and write a zero to the block size field and don't emit any data. Record the number of bytes saved this way. For fragments, set the fragment offset to invalid. - In the inode writer: write out the number of bytes saved for sparse files. If there should be a fragment but there is none, append a block count of 0. - In the data reader: if the block size is 0, read nothing from disk and emit an empty block. Do the same if the fragment is missing. - In the inode reader: restore the number of bytes saved for sparse files. The sparse files can be packed and unpacked, but the unpacking will not create sparse files for now. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-06-28Ommit fragment table if there really are no fragmentsDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-06-28Fix inode fragment & sparse counter initializationDavid Oberhollenzer
The sparse attribute should be initialized with 0. It is subtracted from the file size in the kernel to determine the file size on disk to report to stat(2). So it actually didn't matter anyway (just for correctness sake). Second, the fragment index and offset should be set to 0xFFFFFFFF in the rare case that no fragments exist. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-06-28Add basic support for the GNU tar formatDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-06-27Relax tar header parser to accept pre-posix formatsDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-06-26Add support for negative timestamps in pax headerDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-06-23Split up fstree_add_xattrDavid Oberhollenzer
This IMO makes it somewhat easier to read and understand what's going on. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-06-23Move fstree default option processing to fstree codeDavid Oberhollenzer
Instead of decomposing a default string in gensquashfs option processing, move that to fstree_init instead and pass the option string directly to fstree_init. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-06-23Move all handling of compressor names to libcompress.aDavid Oberhollenzer
This commit removes handling of compressor names from gensquashfs. Instead, functions are added to libcompress to obtain name from ID, ID from name and to print out defaults. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-06-22fix: always set permissions on symlinks to 0777David Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-06-22Cleanup: unify packdir/packfile based directory changes in gensquashfsDavid Oberhollenzer
This commit removes the packdir/packfile based directory setup magic from fstree_from_file and moves it to gensquashfs. Over there, the common parts are deduplicated. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-06-22Cleanup: split fstree sort into 2 fstree independend functionsDavid Oberhollenzer
Make tree node list sort and recursive variant available and independend of the fstree_t. This is considered cleaner, since the fstree_t actually isn't needed for any of this and we can just call the recusvie sort on the root instead, and we can use the sort implementation directly for things like the upcoming unit test. Also this commit splits up the merge/sort implementation into a seperate split and merge functions to make the code somewhat more readable. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-06-22simplify SELinux labelingDavid Oberhollenzer
This commit moves the SELinux label code after the tree is sorted and the inode table is generated. Sorting helps to make sure that the tree will always be traversed in a defined, deterministic order and likewise the creation of xattrs happens in a defined, deterministic order. Second, we can now use the inode table instead of having to implement a recursive tree traversal yet again. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-06-22fix: actually update permissions in fstree add by pathDavid Oberhollenzer
When creating a directory that has previously been created implicitly, actually update the permissions as the documentation says. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-06-21fix: flipped conditional in tar header parserDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-06-20simplify and improve canonicalize_nameDavid Oberhollenzer
- Replace scan and memmove with simple automaton - Convert forward to back slashes, lots of file systems treat them equivalenty, this saves us a few more checks down the road - Remove './' path components. We can saveley remove them in a string processing step instead of throwing an error. Also they actually appear often in tar balls, possibly not under user control. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-06-19Split generic tar code off to static libraryDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-06-19Cleanup: split up fstree.cDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-06-19Cleanup fstree codeDavid Oberhollenzer
Replace default_$FIELD with a struct stat. Merge the rest of add_node/add_file into mknode and add by path+stat. Expose the mknode function and replace all the duplicated node pointer arithmetic magic with a call to mknode. Plus a generic cleanup by utlizing new util functions. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-06-18Cleanup fstree file parserDavid Oberhollenzer
- use generic struct stat based tree node add function - simplify some of the parsing code Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-06-17libfstree: add generic function to add node from struct statDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-06-15libfstree.a: add function to get struct stat from tree nodeDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-06-15Move super block version check to sqfs_super_readDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-06-15Move function to padd a file with 0 bytes to libutilDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-06-15libfstree.a: allow adding a file with no input sourceDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-06-11Move file extraction code to generic data_reader_t in libsquashfs.aDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-06-11Cleanup dependency handlingDavid Oberhollenzer
Always try to gather all compressor libraries available, but only complain about missing a one if it has been *explicitly* selected. If a compressor has been explicityl disabled, we can still turn it off after checking. Also, rework gensquashfs to set the default compressor based on what's available. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-06-11Move write_xattr to libsqfs.aDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-06-11Move data writer to libsqfs.aDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-06-11cleanup: mark input pointer on write_retry as constDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-06-10cleanup: move tree deserialization to libsqfs.aDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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