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Teach importpkg how to download urls using urlopen and thus remove the
need for invoking curl.
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For variations of dedup, that do not consume the data.tar member, this
option can save significant bandwidth.
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* streaming means that we do not need to hold the entire package list
in memory (but the pkgs dict will become large anyway).
* The decompress utility allows easily switching to e.g. xz which is
the only compression format for the dbgsym suites.
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Iteration over file-like is required by deb822.Packages.iter_paragraphs.
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The former behaviour was ignoring them. The intended use for dedup is to
know whenever a package unconditionally requires another package.
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The handle_ar_member and handle_ar_end methods now have a default
implementation adding further handlers handle_debversion,
handle_control_tar and handle_data_tar.
In that process two additional bugs were fixed:
* decompress_tar was wrongly passing errors="surrogateescape" for
Python 2.x even though that's only supported for Python 3.x.
* The use of decompress actually passes the extension as unicode.
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The autoimport tool runs the Python interpreter explicitly. Instead of
invoking just "python" and thus calling whatever the current default is,
use sys.executable which is the interpreter used to run autoimport, thus
locking both to the same Python version.
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In Python 2.x, TarInfo.name is a bytes object. In Python 3.x,
TarInfo.name always is a unicode object. To avoid importpkg crashing
with an exception, we direct the Python 3.x decoding to use
surrogateescapes. Thus decoding the name boils down to checking whether
it contains surrogates.
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Building on the previous commit, add a decompress function that turns a
compressed filelike into a decompressed filelike. Use it to decouple the
decompression step.
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It now supports:
* tell()
* seek(absolute_position), forward only
* close()
* closed
This is sufficient for putting it as a fileobj into tarfile.TarFile. By
doing so we can decouple decompression from tar processing, which eases
papering over the Python 2.x vs Python 3.x differences.
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They really are an aspect of the particular extractor and can easily be
changed by subclassing.
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It is supposed to separate the parsing of Debian packages (understanding
how the format works) from the actual feature extraction. Its goal is to
simplify writing custom extractors for different feature sets.
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Instead of carefully crafting an iterator to pass to yaml.safe_dump_all,
we simply take control on our own and call represent on a yaml dumper
object where needed.
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Otherwise the yaml will contain binary strings on py3k which end up as
binary data in the sqlite database. In py2, yaml can handle those
unicode objects just fine.
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zlib.crc32 returns a int32_t on py2 and a uint32_t on py3.
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While in current sid packages the control file in control.tar is always
named "./control", some older packages name it "control".
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wording, more NOT NULLs, some more explanations
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Thanks to Peter Palfrader for explaining what information is needed and
reviewing the documentation.
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Creating packages with lzma compression has been deprecated since dpkg
1.16.4, but there might be some of those in the wild and supporting them
is strightforward when xz is already supported.
Signed-off-by: Guillem Jover <guillem@debian.org>
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dpkg supports those since 1.17.6.
Signed-off-by: Guillem Jover <guillem@debian.org>
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The GNU ar format adds a trailing slash to the member names, normalize
the member names to take this into account.
Signed-off-by: Guillem Jover <guillem@debian.org>
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Reported-By: Stefan Kaltenbrunner
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When comparing two packages, objects would be considered duplicates
without considering whether the respective hash functions are comparable
by checking their equivalence classes. The current set of hash functions
does not expose this bug.
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Hash functions are partitioned into equivalence classes. We are
generally only interested in sharing among hash functions with the same
equivalence class, but the algorithm would compute any sharing. While
the current layout never produces the same hashes for functions in
difference equivalence classes (for different output length), that may
change in future.
Also allow hash functions, that belong to no equivalence class at all
(eqclass = NULL) as a means to add additional metadata to content
without computing any sharing for it.
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Otherwise the gzip hash cannot tell the empty stream and the
compressed empty stream apart.
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Otherwise all files smaller than 10 bytes are successfully hashed to the
hash of the empty input when using the GzipDecompressor.
Reported-By: Olly Betts
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On the main instance opening cursors equals initiating a connection.
Unfortunately sqlite3.Connection.close does not close filedescriptors.
So just open less cursors to leak filedescriptors less often.
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Leaking them can result in running out of available filedescriptors.
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