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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>
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If read_retry fails to read the expected amount of data (EOF or otherwise),
it is almost always an error.
This commit renames read_retry to read_data and moves error handling
into the function, making a lot of error handling code redundant.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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If write_retry fails to write everything, it is *always* an error.
This commit renames write_retry to write_data and moves error handling
into the function, making a lot of error handling code redundant.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Some experiments seem to indicate that the various GNU extensions are
more widely supported than their POSIX equivalents[1]. Possibly because
they are easier to implement and possibly because of the wide spread
use of GNU tar.
This commit replaces the PAX writer in the write_tar_header implementation
with a GNU extension based writer.
The writer is also cleaned up by removing all global state. The record
counter is moved outside into the tar2sqfs program and passed in as
function argument.
[1] https://dev.gentoo.org/~mgorny/articles/portability-of-tar-features.html
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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If the tar header name is exactely 100 bytes long, it does not have a
trailing null byte. Using strlen/strcpy on it effectively concatenates
the following fields contents to it.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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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>
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Mainly to make scan-build happy.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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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>
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Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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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>
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Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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