Allows to lookup an entry in a directory based on the provided `DirectoryEntry`.
This is needed to navigate the filesystem based on `DirectoryEntry`s and similar
to the find_goodbye_entry() function in src/pxar/fuse.rs
Signed-off-by: Christian Ebner <c.ebner@proxmox.com>
As it turns out the original implementation was correct and the start in
`DirectoryEntry` points to the `PxarEntry` and not as wrongly stated to the
filename.
This reverts the incorrect code and adds comments to the fields clarifying this.
Signed-off-by: Christian Ebner <c.ebner@proxmox.com>
`Decoder::restore()` calls the `SequentialDecoder::restore()` which expects to
encounter a `PxarEntry` at first. But the start of `DirectoryEntry` points to the
filename (except for the root dir), so skip over it.
Signed-off-by: Christian Ebner <c.ebner@proxmox.com>
The expensive call to Decoder::read_directory_entry() can be omitted as
Decoder::attributes() returns all the information the fuse response needs.
Signed-off-by: Christian Ebner <c.ebner@proxmox.com>
This exposes the option to pass a list of exclude MatchPattern via the
'--exclude' option.
The list is encoded as file '.pxarexclude-cli' in the archives root directory.
If such a file is present in the filesystem, it is skipped and not included in
the archive in order to avoid conflicting information.
Signed-off-by: Christian Ebner <c.ebner@proxmox.com>
This provides the functionality needed to encode MatchPatterns passed on the cli
in the root directory.
Signed-off-by: Christian Ebner <c.ebner@proxmox.com>
and add Session::from_decoder() in order to be able to create a fuse session
with a `Decoder` given as argument.
Signed-off-by: Christian Ebner <c.ebner@proxmox.com>
This patch introduces `Context` to hold the decoder, ino_offset and caches for
the attributes and the goodbye table.
By caching, certain callbacks can be handled without the need to read additional
data via the decoder, which improves performance.
The searching of the goodbye table is refactored as well, avoiding recursive
function calls in case of a hash collision.
Signed-off-by: Christian Ebner <c.ebner@proxmox.com>
The hash of the filename in the goodbye table items allows to quickly compare to
a hashed filename.
Unfortunately, a matching hash is no garantee for matching filenames as hash
collisions are possible.
This patch fixes such possible collisions by further checking the filenames once
a matching hash has been found.
This introduces no significant extra cost (except for the filename comparison)
for cases with matching hashes, as the lookup call has to seek and read the file
attributes (including the filename) anyway.
In cases with hash collision, the next matching item is read and treaded
analogously (what means we need at least one extra seek).
As collisions should be not that frequent, this should be an acceptable penalty.
Signed-off-by: Christian Ebner <c.ebner@proxmox.com>
The functionality of stat is split into smaller sub-functions, which allows
to reuse them more flexible, as the code flow is similar but not always the same.
By this, the ugly and incorrect re-setting of the i-node in the lookup callback
function is avoided.
The correct i-node is now calculated beforehand and stat simply creates a
`libc::stat` struct from the provided parameters.
Also, this fixes incorrect i-node assignments in the readdir callback function.
Signed-off-by: Christian Ebner <c.ebner@proxmox.com>
The lookup call checks if the given filename is found in the directory referenced
by the i-node by calclulating the filenames hash and looking it up in the
directories goodbye table.
If found, the entries parameters are returned.
In order to be able to lookup the parent offset by a given file offset in the
readdir callback, this also stores the corresponding values in a HashMap.
Signed-off-by: Christian Ebner <c.ebner@proxmox.com>
In order to read the contents of the goodbye table while keeping the
functionality of list_dir in place as is.
Signed-off-by: Christian Ebner <c.ebner@proxmox.com>
... and thereby allow it to read a single directory entry based on the
start and end archive offsets.
Signed-off-by: Christian Ebner <c.ebner@proxmox.com>
... as they are not needed with the latest iteration of the fuse callback
function impl (which never made it into the repos).
Signed-off-by: Christian Ebner <c.ebner@proxmox.com>
The previous implementation simply skipped over `size` bytes, which is not
correct as size includes also the header.
By relying on `SequentailDecoder`s read_filename function, this is correctly
taken care of plus some more integrity checks.
Signed-off-by: Christian Ebner <c.ebner@proxmox.com>
Also, removes an unused println statement in the decoder callback function and
fixes a typo.
Further, use ABI compatible Option<&T> for FFI to avoid use of raw pointers.
Signed-off-by: Christian Ebner <c.ebner@proxmox.com>
Implements functions attributes, open, read, read_link and get_dir
to be used by the fuse implementation which uses file offsets within the archive
as inodes to reference the archives items.
Signed-off-by: Christian Ebner <c.ebner@proxmox.com>
By this it is possible to read and check just the first u64 of the corresponding
structs in order to identify the items.
This is needed for the fuse implementation in order to get entries based on the
archive offset, used as inode.
Directories are referenced by the offset to the goodbye tail while other items
are referenced by the offset of the filename followed by the entry.
Signed-off-by: Christian Ebner <c.ebner@proxmox.com>
Dietmar Maurer
Christian Ebner
Wolfgang Bumiller