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2019-07-28Implement data block deduplicationDavid Oberhollenzer
The strategy is as follows: - At the beginning of every file, remember the current position - Once a file is done scan the list of existing files for the following: - Look for an existing file that has a block with the same size and checksum as the first non-sparse block of the current file - After that, every block in the current file has to match in size and checksum the ones in the file that we found, from that point onward - sparse blocks in either file are skipped - If we found a match, we update the current file to point to the first matching block and rewind the squashfs image to remove the newly written data This strategy should in theory be able to find an existing file where the on-disk data *contains* the on-disk data of the current file. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-07-28Implement fragment deduplication in data writerDavid Oberhollenzer
The strategy is simple: - The data writer function that write data/fragment blocks get access to the list files. - When writing a fragment, we look for an already written file that has a fragment with the same size and checksum. - If we find one, we throw away the fragment and reuse the existing one. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-07-28Unify common file start/end code from data writer in helper functionsDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-07-28Compute per-block and per-fragment checksums in data wrtierDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-07-28Add fragment and block checksum fields to file_info_tDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-07-28Add utility function to compute crc32 check sumsDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-07-28Merge remaining code of fragment reader into data readerDavid Oberhollenzer
After the table read unification, there wasn't much left of the fragment reader and the remains could easily be moved over to the data reader. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-07-28Split data_reader_dump_file into smaller functionsDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-07-28Bump version numberv0.5David Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-07-25Use safer string copy function to fill tar headerDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-07-25Make sure symlink in fstree_mknode is always set when creating a symlinkDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-07-25Enforce reasonable upper and low bounds on the size of tar headersDavid Oberhollenzer
Since they are read directly into memory, blindly allocating the size from the tar ball is probably a bad idea. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-07-25Fix potential resource leak in deserialize_treeDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-07-25Fix checks of super block block sizeDavid Oberhollenzer
Make sure range is checked when reading a block and that the check is made correctly. Also make the block log check a little more strict. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-07-25Add assertion around canonicalize_name in rdsquashfsDavid Oberhollenzer
The names generated by fstree are always in the correct format, but this is still needed for the sake of documentation and to guide static analysis tools. Should canonicalize_name fail on an fstree generated name, something is serverly broken. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-07-25Fix acciedental usage of left over local variable instead struct memberDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-07-25Update rdsquashfs man pageDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-07-25Terminate the unpacker child processes if the main process exitsDavid Oberhollenzer
Should the main process exit (e.g. the user presses CTRL+C) or explcitily sends it a signal, the desired behaviour is for the children to stop unpacking and exit. This commit adds a line to configure the kernel to send SIGKILL to the children if their parent dies. The same option also exists on various BSDs (not all of them) but with a different name which has to be checked for and adjusted should the program be required to run on one of those. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-07-25Implement simple, fork() based parallel unpacking in rdsquashfsDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-07-25rdsquashfs: seperate creating of the hierarchy, unpacking and chmod/chownDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-07-25Generate linear file list in fstreeDavid Oberhollenzer
Instead of doing DFS on the fly in gensquashfs, churn out a linked list of all files in an archive. Future improvements in packing strategies can go into this file. This can also be usefull for other purposes in the future, such as file deduplication or as a work queue for the unpacker. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-07-25cleanup: remove unneccessary conditionals from automake filesDavid Oberhollenzer
If some library isn't present, the variable $(FOO_LIBS) simply evaluates to empty string, so it can be simply be added to LDADD without any checks. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-07-25cleanup: remove some redundant header inclusionsDavid Oberhollenzer
The utility programs pretty much all have the same structure of including one central header per C file that includes all required library headers, so we can simply include config.h which we need for large file support from there and remove it from the C files. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-07-25Add generic read_table function similar to write_tableDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-07-25Cleanup sqfs_write_tableDavid Oberhollenzer
This commit attempts to make the generic table writer more readable. A few changes are made, including heap allocation of the block list. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-07-25Rename table.c to write_table.c in accordance to function it containsDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-07-25Fix fragment reader out of bounds read when loading tableDavid Oberhollenzer
This commit fixes a bug in the fragment table reader where the reader tries to read data into an out of bounds location due to an oversight in size calculation. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-07-25Replace reads in squashfs with positional readsDavid Oberhollenzer
In most cases, we know exactely where the data that we want to read is on disk, so instead of using read() on the squashfs (or lseek + read), the code can in many places be cleaned up to use the pread wrapper read_data_at instead. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-07-25libutil: add read_data style wrapper around pread()David Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-07-25Update READMEDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-07-24libfstree: fix signed/unsigned comparisonsDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-07-24Fix processing of tar mtime on 32 bit systemsDavid Oberhollenzer
struct stat uses time_t to store time values. On some 32 bit systems, this may be a 32 bit integer. This patch adds a broken-out 64 bit time value to tar_header_decoded_t and makes sure to clamp the value to +/- (2^32 - 1) if required when writing it back to a struct stat. Reported-by: Matt Turner <mattst88@gmail.com> Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-07-24cleanup: remove atime/ctime processing codeDavid Oberhollenzer
This commit removes all the code for parsing and processing atime/ctime and values and related test code. Caring about those is kind of pointless because squashfs can only store mtime in inodes. The only relevant place is when generating a struct stat from a squashfs inode or an fstree node. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-07-24Correct copy-and-paste mistakeMatt Turner
Would cause the build to fail if zstd was enable and lz4 was disabled. Signed-off-by: Matt Turner <mattst88@gmail.com> Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-07-24Include the reason ZSTD gave us for the errorMatt Turner
Without it you're left guessing or using a debugger to figure out what's wrong. Signed-off-by: Matt Turner <mattst88@gmail.com> Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-07-24Enable largefile supportMatt Turner
Requires that config.h be included before other headers, since the macro _FILE_OFFSET_BITS changes the definitions of things like 'struct stat'. I chose to simply include it at the top of every C file and at immediately after the double-inclusion guards of every header. Signed-off-by: Matt Turner <mattst88@gmail.com> Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-07-24libtar: more lenient tar checksum verificationDavid Oberhollenzer
Until now, the tar checksum verification simply copied the header, recomputed the checksum and compared it byte-for-byte with the original. However, not all implementations store the checksum the same way. For instance, git-archive generates tar balls that use the same format as for other octal numbers. This patch makes the checksum verification more lenient by parsing the checksum from the header and comparing it with the computed value instead of copying the entire block and insisting on byte-for-byte equivalence. The result is better interoperabillity with existing tools and perhaps slightly faster processing since the block doesn't have to be copied. Reported-by: Matt Turner <mattst88@gmail.com> Suggested-by: René Scharfe <l.s.r@web.de> Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-07-23Fix tree node scanningDavid Oberhollenzer
- Bail early on empty directories without touching the meta readers. - Aport the directory read loop if we can't even read a header anymore, no matter if there are bytes remaining. - Also add that same condition to the inner loop. The later two actually caused a numeric overflow on some particularly malformed squashfs images, going into a RAM filling infinite loop. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-07-22Convert README "limitations" to github issuesDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-07-22Add a way to optionally keep the original time stampsDavid Oberhollenzer
First of all, this commit adds a mod_time field to a tree node. When creating the tree node, the field is set from the struct stat. When scanning a directory, the time stamps from the input are used if set. Second, the libsqfs code that reads inodes is modified to store the mod_time from the inode in the fstree node and to write the tree node into a generated inode. Finally, tar2sqfs is modified to optionally keep the timestamps from the tar archive instead of setting defaults. gensquashfs is similarly modified to keep the input timestamps if specified. The result is as follows: - sqfs2tar will always carry the timestamps from the squashfs over to the tar ball. - tar2sqfs will set defaults, unless explicitly asked to preserve the mtime from the tar ball. - gensquashfs can optionally preserve the mtime from the input hierarchy it processes if only --pack-dir is specified. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-07-21Fix indexing into export tableDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-07-21Update READMEDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-07-21fix possible leak in tar2sqfs if writing xattrs failsDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-07-21Implement generating an inode table for NFS exportDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-07-21Add simplistic test case for xattr reference countingDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-07-21Fix fstree_xattr unit testDavid Oberhollenzer
The members have been split up and renamed. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-07-21Update READMEDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-07-21Add support for storing xattr values out-of-lineDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-07-21Cleanup xattr handlingDavid Oberhollenzer
- Store them in a struct instead of a hacky uint64_t with magic shifts - Split up key/value pair write function to write_key and write_value - Move the size accounting into those functions respectively Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-07-21cleanup: remove left over, unused assignmentDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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