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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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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>
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Mainly to make scan-build happy.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Bug found using scan-build.
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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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>
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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>
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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>
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Don't allocate the compressor structure twice.
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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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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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>
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Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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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>
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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 IMO makes it somewhat easier to read and understand what's going on.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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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>
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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>
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Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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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>
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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>
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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>
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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>
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Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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- 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>
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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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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>
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- 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>
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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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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>
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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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The idea is to move various higher level helper functions there.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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