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2016-01-26drop explicit check for EWOULDBLOCK if it has the same value as EAGAINDavid Kalnischkies
gcc correctly reports that we check for the same value twice, expect that the manpage of read(2) tells us to do it for portability, so to make both sides happy lets add a little #if'ing here. Reported-By: gcc-6 Git-Dch: Ignore
2016-01-26Delete copy constructor and operator= for DynamicJulian Andres Klode
This would mess up reference counting and should not be allowed (it could be implemented correctly, but it would not be efficient and we do not need it). Gbp-Dch: ignore
2016-01-25reimplement build-dep via apts normal resolverDavid Kalnischkies
build-dep was implemented by parsing the build-dependencies of a package and figuring out which packages to install/remove based on this. That means that for the first level of dependencies build-dep was implementing its very own resolver with all the benefits (aka: bugs) this gives us for not using the existing resolver for all levels. Making this work involves generating a dummy binary package with fitting Depends and Conflicts and as we can't create them out of thin air the cache generation needs to be involved so we end up writing a Packages file which we want to parse – after we have parsed the other Packages files already. With .dsc/.deb files we could add them before we started parsing anything. With a bit of care we can avoid generating too much data we have to throw away again (as many parts assume that e.g. the count of packages doesn't change midair), so that on a speed front there shouldn't be much of a difference, but output can be slightly confusing as if we have a completely valid cache on disk the "Reading package lists... Done" is printed two times – but apt is pretty quick about it in that case. Closes: #137560, #444930, #489911, #583914, #728317, #812173
2016-01-25use consistently the last : as name:arch separatorDavid Kalnischkies
Proper debian packages do not contain ':' in the package name, so for real packages this is a non-issue, but apt itself frequently makes use of packages with such an illegal name for internal proposes. Git-Dch: Ignore
2016-01-25prefer upgrading installed provides satisfierDavid Kalnischkies
If you have chosen to install a foreign architecture provider it is more reasonable to keep this provider instead of removing this one to replace it with a newer version from a (usually) more preferred arch. Git-Dch: Ignore
2016-01-25treat an empty dependency field just like it doesn't existDavid Kalnischkies
Git-Dch: Ignore
2016-01-25always create pkg at the time pkg:arch is createdDavid Kalnischkies
To resolve dependencies like "pkg:arch" we create a package with the name "pkg:arch" and the architecture "any". We create these packages only if a dependency needs it as these kind of dependencies aren't that common. This commit ensured that in the even this architecture specific dependency is the only relation this package has we still create the underlying package to have them available in provides resolution.
2016-01-25Use c++11 for loop in AptHistoryRequestingUserMichael Vogt
Git-Dch: ignore
2016-01-25Store "Requested-By" user in history.log in a simpler formatMichael Vogt
Git-Dch: ignore Thanks: David Kalnischkies
2016-01-25Log calling SUDO_USER or PKEXEC_UID in history.logMichael Vogt
Thanks: Thomas Reusch
2016-01-23Remap another (non-parameter) StringViewJulian Andres Klode
I only looked at parameters in the previous commit, which was not enough: One place also generated local string views. In this case, we only need to make ArchA dynamic, as NameA is not used after the FindPkg() call. Gbp-Dch: ignore
2016-01-23Remap StringView instances pointing into the cacheJulian Andres Klode
It turns out that StringViews might need to be remapped in some places because they come from the cache. For example, some sites pass a Ver.VerStr() to NewProvides(). Such a StringView would become invalid during the duration of the call if the cache is remapped, causing the program to die with a segmentation fault. We can take care of those issues by remapping string views in the same way we remap all the iterators. String views are only remapped if they point into the cache though, this allows us to write more generic code on the callee site without having to check whether the view points into the cache or not. That's not as efficient as possible, but the overhead does not appear to be measurable. Closes: #812251
2016-01-23Pass the old map size to ReMap()Julian Andres Klode
This allows us to check if a value to be remapped was inside the cache or not, which will become useful at a later point. Gbp-Dch: ignore
2016-01-15string_view: Drop constexpr constructor for standard compatibilityJulian Andres Klode
APT::StringView is supposed to be a temporary measure, until support for the standardized string_view is widely available. Introducing additional unstandardized features just makes porting to the standard version harder. The constexpr constructor also won't have any real effect on most systems, as the compiler will happily optimise the strlen() call away for constant strings. Gbp-Dch: ignore
2016-01-15use APT::StringView for GrabWordDavid Kalnischkies
Git-Dch: Ignore
2016-01-15provide a constexpr char[] overload for APT::StringViewDavid Kalnischkies
The commit also adds a few trivial tests Git-Dch: Ignore
2016-01-15return correct position in APT::StringView::(r)findDavid Kalnischkies
The position returned is supposed to be the position of the character counted from the start of the string, but if we used the substr calling overloads the skipped over prefix wasn't considered. The pos parameter of rfind had also the wrong semantic.
2016-01-15revert file-hash based action-merging in acquireDavid Kalnischkies
Introduced in 9d2a8a7388cf3b0bbbe92f6b0b30a533e1167f40 apt tries to merge actions like downloading the same (as judged by hashes) file into doing it once. The implementation was very simple in that it isn't planing at all. Turns out that it works 90% of the time just fine, but has issues in more complicated situations in which items can be in different stages downloading different files emitting potentially the "wrong" hash – like while pdiffs are worked on we might end up copying the patch instead of the result file giving us very strange errors in return. Reverting the change until we can implement a better planing solution seems to be the best course of action even if its sad. Closes: 810046
2016-01-14fix M-A:foreign provides creation for unknown archsDavid Kalnischkies
Architectures for packages which do not belong to the native nor a foreign architecture (dubbed barbarian for now) which are marked M-A:foreign still provide in their own architecture even if not for others. Also, other M-A:foreign (and allowed) packages provide in these barbarian architectures.
2016-01-11Sort the list of sources to be built and linkedMattia Rizzolo
Fix reproducibility issue due to readdir() order by sorting the list of sources to be built and linked. [jak@debian.org: Added summary and fixed typo] Closes: #810509
2016-01-08Store the size of strings in the cacheJulian Andres Klode
By storing the size of the string in the cache, we can make use of it when comparing the names in the hashtable in pkgCache::FindGrp.
2016-01-08HashSumValue::Set: Do not provide const char* overloadJulian Andres Klode
Hide the std::string overload instead of providing a const char * one, the old variant was stupid. Gbp-Dch: ignore
2016-01-08debListParser: Convert another ParseDepends to StringViewJulian Andres Klode
I overlooked this Gbp-Dch: ignore
2016-01-08remove uncompressed leftover partial file before pdiff bootstrapDavid Kalnischkies
The code already deals with compressed leftovers, but forgot the uncompressed files. The opertunity is picked to reorder this code and add debug messages about the actions taken as well as produce such a leftover file in the associated testcase.
2016-01-08use filesize of compressed pdiffs for the limit if possibleDavid Kalnischkies
With the addition of the $HASH-Download field in the .diff/Index we got the size of the compressed patches for 'free', so if that information is available we can use it for a more fitting calculation of the size requirements of the patches vs. the complete file. Note that this predicts a too small size in the transition case in which the information isn't available for all patches, but figuring this out would be a lot of code for practically nothing as only one update can ever be in such a transition phase.
2016-01-08keep compressed indexes in a low-cost formatDavid Kalnischkies
Downloading and storing are two different operations were different compression types can be preferred. For downloading we provide the choice via Acquire::CompressionTypes::Order as there is a choice to be made between download size and speed – and limited by whats available in the repository. Storage on the other hand has all compressions currently supported by apt available and to reduce runtime of tools accessing these files the compression type should be a low-cost format in terms of decompression. apt traditionally stores its indexes uncompressed on disk, but has options to keep them compressed. Now that apt downloads additional files we also deal with files which simply can't be stored uncompressed as they are just too big (like Contents for apt-file). Traditionally they are downloaded in a low-cost format (gz) as repositories do not provide other formats, but there might be even lower-cost formats and for download we could introduce higher-cost in the repositories. Downloading an entire index potentially requires recompression to another format, so an update takes potentially longer – but big files are usually updated via pdiffs which has to de- and re-compress anyhow and does it on the fly anyhow, so there is no extra time needed and in general it seems to be benefitial to invest the time in update to save time later on file access.
2016-01-08allow pdiff bootstrap from all supported compressorsDavid Kalnischkies
There is no reason to enforce that the file we start the bootstrap with is compressed with a compressor which is available online. This allows us to change the on-disk format as well as deals with repositories adding/removing support for a specific compressor.
2016-01-08ensure compression cleanup even without lists-cleanupDavid Kalnischkies
If we store files compressed in lists/ and the file switched compression formats we happened to retain the "old" format, but by default the cleanup process catched this oversight and removed the file. [The initial situation described doesn't arise as we store no files by default compressed and even with apt-file configuring Contents files, we don't really have that problem as there is just .gz files for those.] We solve this by just removing any uncompressed as well as compressed (we support) file just before we move the 'new' version of the file in.
2016-01-08use one 'store' method to rule all (de)compressorsDavid Kalnischkies
Adding a new compressor method meant adding a new method as well – even if that boilt down to just linking to our generalized decompressor with a new name. That is unneeded busywork if we can instead just call the generalized decompressor and let it figure out which compressor to use based on the filenames rather than by program name. For compatibility we ship still 'gzip', 'bzip2' and co, but they are just links to our "new" 'store' method.
2016-01-08AvailableDescriptionLanguages: Use one string for all iterationsJulian Andres Klode
Do not create strings within the loop, that creates one string per language and does more work than needed. Instead, reserve enough space at the beginning and assign the prefix, and then resize and append inside the loop. Also call exists with the string itself instead of the c_str(), this means that the lookup uses the size information in the string now and does not have to call strlen() on it.
2016-01-08pkgCacheGenerator: CurMd5.Value() cannot be emptyJulian Andres Klode
It makes no sense to check if the value is empty, as it cannot be. It will always be a hexstring of exactly 32 bytes.
2016-01-08operator==(char*, StringView) use StringView.operator==Julian Andres Klode
Use the same path for both comparisons, as the operator== path is faster than just calling compare() - it avoids any comparison if the size differs. Gbp-Dch: ignore
2016-01-08pkgCacheGenerator::hash: Do not call tolower_ascii()Julian Andres Klode
Gbp-Dch: ignore
2016-01-08pkgCacheGenerator::StoreString: Get rid of std::stringJulian Andres Klode
Instead of storing a string -> map_stringitem_t mapping, create our own data type that can point to either a normal string or a string inside the cache. This avoids the creation of any string and improves performance slightly (about 4%).
2016-01-08Replace compare() == 0 checks with this == other checksJulian Andres Klode
This improves performance, as we now can ignore unequal strings based on their length already. Gbp-Dch: ignore
2016-01-08pkgCacheGenerator: Use StringView for toStringJulian Andres Klode
This removes some minor overhead. Gbp-Dch: ignore
2016-01-08pkgCacheGenerator::StoreString: Move the string into the mapJulian Andres Klode
Moving the string is likely faster than copying it. We could probably avoid strings alltogether in the future using some more crazy code, but I have not looked at that yet. Gbp-Dch: ignore
2016-01-07StringView: rfind: pos should be end of substr, not startJulian Andres Klode
Gbp-Dch: ignore
2016-01-07StringView: pos argument default should be nposJulian Andres Klode
Gbp-Dch: ignore
2016-01-07StringView::rfind(): Call rfind() instead of find() on substJulian Andres Klode
Thanks: Niels Thykier for reporting on IRC Gbp-Dch: ignore
2016-01-07Switch performance critical code to use APT::StringViewJulian Andres Klode
This improves performance of the cache generation on my ARM platform (4x Cortex A15) by about 10% to 20% from 2.35-2.50 to 2.1 seconds.
2016-01-07Introduce internal APT::StringView classJulian Andres Klode
The class APT::StringView implements a drop-in replacement for a subset of C++17 std::string_view() features. It will be dropped at a later point and may not be used in public interfaces.
2016-01-07acquire: Allow parallelizing methods without hostsJulian Andres Klode
The maximum parallelization soft limit is the number of CPU cores * 2 on systems defining _SC_NPROCESSORS_ONLN. The hard limit in all cases is Acquire::QueueHost::Limit.
2016-01-07CopyFile: Use 64 * 1024 instead of 64000 as buffer sizeJulian Andres Klode
This is a multiple of the page size and thus results in less page faults, speeding up copying. Also, while we're at at, unify all uses of that size in a constant variable APT_BUFFER_SIZE.
2016-01-07FileFd: (native) LZ4 supportJulian Andres Klode
Implement native support for LZ4 compression, using the official lz4 library.
2016-01-03Increase APT::Cache-HashTableSize default to 50503Julian Andres Klode
This drop the hash table utilization from a high 98% to acceptable 74% on unstable, and the average bucket length from 4.6 to 1.8. This improves performance by about 5%, while increasing the size of the cache by 0.2 out of 38MB, that is 0.5%. 48481 is a nice number
2016-01-03apt-cache: stats: Show a table utilization as percentageJulian Andres Klode
Gbp-Dch: ignore
2016-01-03Change compressor costs to be 100 apartJulian Andres Klode
This will give us the freedom to insert more compressors at positions in between. Also change the cost of uncompressed to 0, as that really has no overhead, and the values do not really mean much.
2016-01-03simple_compressor: Provide some accessors for end and freeJulian Andres Klode
This makes code easier to read, and somewhat more correct. Gbp-Dch: ignore
2016-01-03simple_buffer: Allow buffer size to changeJulian Andres Klode
Gbp-Dch: ignore