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2015-06-12store Release files data in the CacheDavid Kalnischkies
We used to read the Release file for each Packages file and store the data in the PackageFile struct even through potentially many Packages (and Translation-*) files could use the same data. The point of the exercise isn't the duplicated data through. Having the Release files as first-class citizens in the Cache allows us to properly track their state as well as allows us to use the information also for files which aren't in the cache, but where we know to which Release file they belong (Sources are an example for this). This modifies the pkgCache structs, especially the PackagesFile struct which depending on how libapt users access the data in these structs can mean huge breakage or no visible change. As a single data point: aptitude seems to be fine with this. Even if there is breakage it is trivial to fix in a backportable way while avoiding breakage for everyone would be a huge pain for us. Note that not all PackageFile structs have a corresponding ReleaseFile. In particular the dpkg/status file as well as *.deb files have not. As these have only a Archive property need, the Component property takes over this duty and the ReleaseFile remains zero. This is also the reason why it isn't needed nor particularily recommended to change from PackagesFile to ReleaseFile blindly. Sticking with the earlier is usually the better option.
2015-06-11implement 'apt-get files' to access index targetsDavid Kalnischkies
Downloading additional files is only half the job. We still need a way to allow external tools to know where the files are they requested for download given that we don't want them to choose their own location. 'apt-get files' is our answer to this showing by default in a deb822 format information about each IndexTarget with the potential to filter the records based on lines and an option to change the output format. The command serves also as an example on how to get to this information via libapt.
2015-06-11use an enum instead of strings as IndexTarget::Option interfaceDavid Kalnischkies
Strings are easy to typo and we can keep the extensibility we require here with a simple enum we can append to without endangering ABI. Git-Dch: Ignore
2015-06-11use IndexTarget to get to IndexFileDavid Kalnischkies
Removes a bunch of duplicated code in the deb-specific parts. Especially the Description part is now handled centrally by IndexTarget instead of being duplicated to the derivations of IndexFile. Git-Dch: Ignore
2015-06-11show URI.Path in all acquire item descriptionsDavid Kalnischkies
It is a rather strange sight that index items use SiteOnly which strips the Path, while e.g. deb files are downloaded with NoUserPassword which does not. Important to note here is that for the file transport Path is pretty important as there is no Host which would be displayed by Site, which always resulted in "interesting" unspecific errors for "file:". Adding a 'middle' ground between the two which does show the Path but potentially modifies it (it strips a pending / at the end if existing) solves this "file:" issue, syncs the output and in the end helps to identify which file is meant exactly in progress output and co as a single site can have multiple repositories in different paths.
2015-06-10rename Calculate- to GetIndexTargets and use it as official APIDavid Kalnischkies
We need a general way to get from a sources.list entry to IndexTargets and with this change we can move from pkgSourceList over the list of metaIndexes it includes to the IndexTargets each metaIndex can have. Git-Dch: Ignore
2015-06-10stop using IndexTarget pointers which are never freedDavid Kalnischkies
Creating and passing around a bunch of pointers of IndexTargets (and of a vector of pointers of IndexTargets) is probably done to avoid the 'costly' copy of container, but we are really not in a timecritical operation here and move semantics will help us even further in the future. On the other hand we never do a proper cleanup of these pointers, which is very dirty, even if structures aren't that big… The changes will effecting many items only effect our own hidden class, so we can do that without fearing breaking interfaces or anything. Git-Dch: Ignore
2015-06-10store all targets data in IndexTarget structDavid Kalnischkies
We still need an API for the targets, so slowly prepare the IndexTargets to let them take this job. Git-Dch: Ignore
2015-06-10abstract the code to iterate over all targets a bitDavid Kalnischkies
We have two places in the code which need to iterate over targets and do certain things with it. The first one is actually creating these targets for download and the second instance pepares certain targets for reading. Git-Dch: Ignore
2015-06-09replace ULONG_MAX with c++ style std::numeric_limitsDavid Kalnischkies
For some reason travis seems to be unhappy about it claiming it is not defined. Well, lets not think to deeply about it… Git-Dch: Ignore
2015-06-09configureable acquire targets to download additional filesDavid Kalnischkies
First pass at making the acquire system capable of downloading files based on configuration rather than hardcoded entries. It is now possible to instruct 'deb' and 'deb-src' sources.list lines to download more than just Packages/Translation-* and Sources files. Details on how to do that can be found in the included documentation file.
2015-06-09remove debianism file-content verificationDavid Kalnischkies
The code requires every index file we download to have a Package field, but that doesn't hold true for all index we might want to download in the future. Some might not even be deb822 formatted files… The check was needed as apt used to accept unverifiable files like Translation-*, but nowadays it requires hashes for these as well. Even for unsigned repositories we interpret the Release file as binding now, which means this check isn't triggerable expect for repositories which do not have a Release file at all – something which is highly discouraged! Git-Dch: Ignore
2015-06-09do not request files if we expect an IMS hitDavid Kalnischkies
If we have a file on disk and the hashes are the same in the new Release file and the old one we have on disk we know that if we ask the server for the file, we will at best get an IMS hit – at worse the server doesn't support this and sends us the (unchanged) file and we have to run all our checks on it again for nothing. So, we can save ourselves (and the servers) some unneeded requests if we figure this out on our own.
2015-06-09cleanup pdiff support detection decisionDavid Kalnischkies
Its a bit unclean to create an item just to let the item decide that it can't do anything and let it fail, so instead we let the item creator decide in all cases if patching should be attempted. Also pulls a small trick to get the hashes for the current file without calculating them by looking at the 'old' Release file if we have it. Git-Dch: Ignore
2015-06-09support hashes for compressed pdiff filesDavid Kalnischkies
At the moment we only have hashes for the uncompressed pdiff files, but via the new '$HASH-Download' field in the .diff/Index hashes can be provided for the .gz compressed pdiff file, which apt will pick up now and use to verify the download. Now, we "just" need a buy in from the creators of repositories…
2015-06-09fix download-file using testcases to run as rootDavid Kalnischkies
Git-Dch: Ignore
2015-06-09add more parsing error checking for rredDavid Kalnischkies
The rred parser is very accepting regarding 'invalid' files. Given that we can't trust the input it might be a bit too relaxed. In any case, checking for more errors can't hurt given that we support only a very specific subset of ed commands.
2015-06-09check patch hashes in rred worker instead of in the handlerDavid Kalnischkies
rred is responsible for unpacking and reading the patch files in one go, but we currently only have hashes for the uncompressed patch files, so the handler read the entire patch file before dispatching it to the worker which would read it again – both with an implicit uncompress. Worse, while the workers operate in parallel the handler is the central orchestration unit, so having it busy with work means the workers do (potentially) nothing. This means rred is working with 'untrusted' data, which is bad. Yet, having the unpack in the handler meant that the untrusted uncompress was done as root which isn't better either. Now, we have it at least contained in a binary which we can harden a bit better. In the long run, we want hashes for the compressed patch files through to be safe.
2015-06-09rework hashsum verification in the acquire systemDavid Kalnischkies
Having every item having its own code to verify the file(s) it handles is an errorprune process and easy to break, especially if items move through various stages (download, uncompress, patching, …). With a giant rework we centralize (most of) the verification to have a better enforcement rate and (hopefully) less chance for bugs, but it breaks the ABI bigtime in exchange – and as we break it anyway, it is broken even harder. It shouldn't effect most frontends as they don't deal with the acquire system at all or implement their own items, but some do and will need to be patched (might be an opportunity to use apt on-board material). The theory is simple: Items implement methods to decide if hashes need to be checked (in this stage) and to return the expected hashes for this item (in this stage). The verification itself is done in worker message passing which has the benefit that a hashsum error is now a proper error for the acquire system rather than a Done() which is later revised to a Failed().
2015-06-07don't try other compressions on hashsum mismatchDavid Kalnischkies
If we e.g. fail on hash verification for Packages.xz its highly unlikely that it will be any better with Packages.gz, so we just waste download bandwidth and time. It also causes us always to fallback to the uncompressed Packages file for which the error will finally be reported, which in turn confuses users as the file usually doesn't exist on the mirrors, so a bug in apt is suspected for even trying it…
2015-05-22Merge branch 'debian/sid' into debian/experimentalMichael Vogt
Conflicts: apt-pkg/pkgcache.h debian/changelog methods/https.cc methods/server.cc test/integration/test-apt-download-progress
2015-05-22Update methods/https.cc now that ServerState::Size is renamedMichael Vogt
Git-Dch: ignore
2015-05-22Merge remote-tracking branch 'upstream/debian/jessie' into debian/sidMichael Vogt
Conflicts: apt-pkg/deb/dpkgpm.cc
2015-05-22parse arch-qualified Provides correctlyHelmut Grohne
The underlying problem is that libapt-pkg does not correctly parse these provides. Internally, it creates a version named "baz:i386" with architecture amd64. Of course, such a package name is invalid and thus this version is completely inaccessible. Thus, this bug should not cause apt to accept a broken situation as valid. Nevertheless, it prevents using architecture qualified depends. Closes: 777071
2015-05-22Add regression test for LP: #1445239Michael Vogt
Add a regression test that reproduced the hang of apt when a partial file is present. Git-Dch: ignore
2015-05-22Rename "Size" in ServerState to TotalFileSizeMichael Vogt
The variable "Size" was misleading and caused bug #1445239. To avoid similar issues in the future, rename it to make the meaning more obvious. git-dch: ignore
2015-05-22Fix endless loop in apt-get update that can cause disk fillupMichael Vogt
The apt http code parses Content-Length and Content-Range. For both requests the variable "Size" is used and the semantic for this Size is the total file size. However Content-Length is not the entire file size for partital file requests. For servers that send the Content-Range header first and then the Content-Length header this can lead to globbing of Size so that its less than the real file size. This may lead to a subsequent passing of a negative number into the CircleBuf which leads to a endless loop that writes data. Thanks to Anton Blanchard for the analysis and initial patch. LP: #1445239
2015-05-22Merge remote-tracking branch 'upstream/debian/sid' into debian/sidMichael Vogt
2015-05-18treat older Release files than we already have as an IMSHitDavid Kalnischkies
Valid-Until protects us from long-living downgrade attacks, but not all repositories have it and an attacker could still use older but still valid files to downgrade us. While this makes it sounds like a security improvement now, its a bit theoretical at best as an attacker with capabilities to pull this off could just as well always keep us days (but in the valid period) behind and always knows which state we have, as we tell him with the If-Modified-Since header. This is also why this is 'silently' ignored and treated as an IMSHit rather than screamed at the user as this can at best be an annoyance for attackers. An error here would 'regularily' be encountered by users by out-of-sync mirrors serving a single run (e.g. load balancer) or in two consecutive runs on the other hand, so it would just help teaching people ignore it. That said, most of the code churn is caused by enforcing this additional requirement. Crisscross from InRelease to Release.gpg is e.g. very unlikely in practice, but if we would ignore it an attacker could sidestep it this way.
2015-05-13detect Releasefile IMS hits even if the server doesn'tDavid Kalnischkies
Not all servers we are talking to support If-Modified-Since and some are not even sending Last-Modified for us, so in an effort to detect such hits we run a hashsum check on the 'old' compared to the 'new' file, we got the hashes for the 'new' already for "free" from the methods anyway and hence just need to calculated the old ones. This allows us to detect hits even with unsupported servers, which in turn means we benefit from all the new hit behavior also here.
2015-05-12implement VerifyFile as all-hashes checkDavid Kalnischkies
It isn't used much compared to what the methodname suggests, but in the remaining uses it can't hurt to check more than strictly necessary by calculating and verifying with all hashes we can compare with rather than "just" the best known hash.
2015-05-12detect 416 complete file in partial by expected hashDavid Kalnischkies
If we have the expected hashes we can check with them if the file we have in partial we got a 416 for is the expected file. We detected this with same-size before, but not every server sends a good Content-Range header with a 416 response.
2015-05-11rewrite all TFRewrite instances to use the new pkgTagSection::WriteDavid Kalnischkies
While it is mostly busywork to rewrite all instances it actually fixes bugs as the data storage used by the new method is std::string rather than a char*, the later mostly created by c_str() from a std::string which the caller has to ensure keeps in scope – something apt-ftparchive actually didn't ensure and relied on copy-on-write behavior instead which c++11 forbids and hence the new default gcc abi doesn't use it.
2015-05-11implement a more c++-style TFRewrite alternativeDavid Kalnischkies
TFRewrite is okay, but it has obscure limitations (256 Tags), even more obscure bugs (order for renames is defined by the old name) and the interface is very c-style encouraging bad usage like we do it in apt-ftparchive passing massive amounts of c_str() from std::string in. The old-style is marked as deprecated accordingly. The next commit will fix all places in the apt code to not use the old-style anymore.
2015-05-11stop depending on copy-on-write for std::stringDavid Kalnischkies
In 66c3875df391b1120b43831efcbe88a78569fbfe we workaround/fixed a problem where the code makes the assumption that the compiler uses copy-on-write implementations for std::string. Turns out that for c++11 compatibility gcc >= 5 will stop doing this by default.
2015-05-11sync TFRewrite*Order arrays with dpkg and dakDavid Kalnischkies
dpkg and dak know various field names and order them in their output, while we have yet another order and have to play catch up with them as we are sitting between chairs here and neither order is ideal for us, too. A little testcase is from now on supposed to help ensureing that we do not derivate to far away from which fields dpkg knows and orders.
2015-05-11fix 'Source' to 'Package' rename in apt-ftparchiveDavid Kalnischkies
This rename with value is ordered by the 'old' name 'Source', but should be ordered by the new name… by splitting the operation in a delete and a new field we can easily fix this problem locally for now.
2015-05-11drop incorrect parameter implicitely converted to boolDavid Kalnischkies
The helper expects to be told if it should generate messages, not where these messages should be printed – as it isn't printing such messages, but puts them in _error. apt-get uses in other methods a helper specialisation which does also print stuff to a stream through, so this is likely a copy&paste error. Git-Dch: Ignore
2015-05-11fix macro definition for very old GCC < 3David Kalnischkies
Git-Dch: Ignore
2015-05-11show non-matching m-a:same versions in debug messageDavid Kalnischkies
Slightly rewriting the code to ensure we only use two sources for the versions as it could otherwise be confusing to look at.
2015-05-11remove available file to have same dpkg -l behaviorDavid Kalnischkies
dpkg -l < 1.16.2 loads the available file and hence sees a package which later versions do not see, leading to failures on travis-ci. The different versions also have slightly different messages. Git-Dch: Ignore
2015-05-11remove unused and strange default-value for pinsDavid Kalnischkies
If the pin for a generic pin is 0, it get a value by strange looking rules, if the pin is specific the rules are at least not strange, but the value 989 is a magic number without any direct meaning… but both never happens in practice as the parsing skips such entries with a warning, so there always is a priority != 0 and the code therefore never used.
2015-05-11a pin of 1000 always means downgrade allowedDavid Kalnischkies
The documentation says this, but the code only agreed while evaluating specific packages, but not generics. These needed a pin above 1000 to have the same effect. The code causing this makes references to a 'second pesduo status file', but nowhere is explained what this might stand for and/or what it was, so we do the only reasonable thing: Remove all references and do as documented.
2015-05-11do not require installed libapt-pkg-dev for gtestDavid Kalnischkies
Git-Dch: Ignore
2015-05-11improve partial/ cleanup in abort and failure casesDavid Kalnischkies
Especially pdiff-enhanced downloads have the tendency to fail for various reasons from which we can recover and even a successful download used to leave the old unpatched index in partial/. By adding a new method responsible for making the transaction of an individual file happen we can at specialisations especially for abort cases to deal with the cleanup. This also helps in keeping the compressed indexes around if another index failed instead of keeping the decompressed files, which we wouldn't pick up in the next call.
2015-04-28Move sysconf(_SC_OPEN_MAX); out of the for() loop to avoid unneeded syscallsMichael Vogt
2015-04-28releasing package apt version 1.0.9.91.0.9.9Michael Vogt
2015-04-22remove "first package seen is native package" assumptionDavid Kalnischkies
The fix for #777760 causes packages of foreign (and the native) architectures, to be created correctly, but invalidates (like the previously existing, but policy-forbidden architecture-less packages we had to support for some upgrade scenarios) the assumption that the first (and only) package in the cache for a single architecture system must be the package for the native architecture (as, where should the other architectures come from, right? Wrong.). Depending on the order of parsing sources more or less packages can be effected by this. The effects are strange (for apt it mostly effects simulation/debug output, but also apt-mark on these specific packages), which complicates debugging, but relatively harmless if understood as most actions do not need direct named access to packages. The problem is fixed by removing the single-arch special casing in the paths who had them (Cache.FindPkg), so they use the same code as multi-arch systems, which use them as a wrapper for Grp.FindPkg. Note that single-arch system code was using Grp.FindPkg before as well if a Grp structure was handily available, so we don't introduce new untested code here: We remove more brittle special cases which are less tested instead (this was planed to be done for Stretch anyhow). Note further that the method with the assumption itself isn't fixed. As it is a private method I opted for declaring it deprecated instead and remove all its call positions. As it is private no-one can call this method legally (thanks to how c++ works by default its still an exported symbol through) and fixing it basically means reimplementing code we already have in Grp.FindPkg. Removing rather than fixing seems hence like a good solution. Closes: 782777 Thanks: Axel Beckert for testing
2015-04-19Merge branch 'debian/jessie' into debian/experimentalDavid Kalnischkies
Conflicts: apt-pkg/acquire-item.cc cmdline/apt-key.in methods/https.cc test/integration/test-apt-key test/integration/test-multiarch-foreign
2015-04-19hide first pdiff merge failure debug messageDavid Kalnischkies
The sibling of this message are all guarded as debug messages, just this one had it missing an subsequently causes display issues if triggered. Git-Dch: Ignore