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2015-06-16add d-pointer, virtual destructors and de-inline de/constructorsDavid Kalnischkies
To have a chance to keep the ABI for a while we need all three to team up. One of them missing and we might loose, so ensuring that they are available is a very tedious but needed task once in a while. Git-Dch: Ignore
2015-06-15allow ratelimiting progress reporting for testcasesDavid Kalnischkies
Progress reports once in a while which is a bit to unpredictable for testcases, so we enforce a steady progress for them in the hope that this makes the tests (mostly test-apt-progress-fd) a bit more stable. Git-Dch: Ignore
2015-06-15condense parallel requests with the same hashes to oneDavid Kalnischkies
It shouldn't be too common, but sometimes people have multiple mirrors in the sources or otherwise repositories with the same content. Now that we gracefully can handle multiple requests to the same URI, we can also fold multiple requests with the same expected hashes into one. Note that this isn't trying to find oppertunities for merging, but just merges if it happens to encounter the oppertunity for it. This is most obvious in the new testcase actually as it needs to delay the action to give the acquire system enough time to figure out that they can be merged.
2015-06-15show item ID in Hit, Ign and Err lines as wellDavid Kalnischkies
Again, consistency is the main sellingpoint here, but this way it is now also easier to explain that some files move through different stages and lines are printed for them hence multiple times: That is a bit hard to believe if the number is changing all the time, but now that it keeps consistent.
2015-06-15call URIStart in cdrom and file methodDavid Kalnischkies
All other methods call it, so they should follow along even if the work they do afterwards is hardly breathtaking and usually results in a URIDone pretty soon, but the acquire system tells the individual item about this via a virtual method call, so even through none of our existing items contains any critical code in these, maybe one day they might. Consistency at least once… Which is also why this has a good sideeffect: file: and cdrom: requests appear now in the 'apt-get update' output. Finally - it never made sense to hide them for me. Okay, I guess it made before the new hit behavior, but now that you can actually see the difference in an update it makes sense to see if a file: repository changed or not as well.
2015-06-15deal better with acquiring the same URI multiple timesDavid Kalnischkies
This is an unlikely event for indexes and co, but it can happen quiet easily e.g. for changelogs where you want to get the changelogs for multiple binary package(version)s which happen to all be built from a single source. The interesting part is that the Acquire system actually detected this already and set the item requesting the URI again to StatDone - expect that this is hardly sufficient: an Item must be Complete=true as well to be considered truely done and that is only the tip of the ::Done handling iceberg. So instead of this StatDone hack we allow QItems to be owned by multiple items and notify all owners about everything now, so that for the point of each item they got it downloaded just for them.
2015-06-15provide a public interface for acquiring changelogsDavid Kalnischkies
Provided is a specialized acquire item which given a version can figure out the correct URI to try by itself and if not provides an error message alongside with static methods to get just the URI it would try to download if it should just be displayed or similar such. The URI is constructed as follows: Release files can provide an URI template in the "Changelogs" field, otherwise we lookup a configuration item based on the "Label" or "Origin" of the Release file to get a (hopefully known) default value for now. This template should contain the string CHANGEPATH which is replaced with the information about the version we want the changelog for (e.g. main/a/apt/apt_1.1). This middleway was choosen as this path part was consistent over the three known implementations (+1 defunct), while the rest of the URI varies widely between them. The benefit of this construct is that it is now easy to get changelogs for Debian packages on Ubuntu and vice versa – even at the moment where the Changelogs field is present nowhere. Strictly better than what apt-get had before as it would even fail to get changelogs from security… Now it will notice that security identifies as Origin: Debian and pick this setting (assuming again that no Changelogs field exists). If on the other hand security would ship its changelogs in a different location we could set it via the Label option overruling Origin. Closes: 687147, 739854, 784027, 787190
2015-06-15implement default apt-get file --release-info modeDavid Kalnischkies
Selecting targets based on the Release they belong to isn't to unrealistic. In fact, it is assumed to be the most used case so it is made the default especially as this allows to bundle another thing we have to be careful with: Filenames and only showing targets we have acquired. Closes: 752702
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.
2015-06-11show 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.
2015-06-10store 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
2015-06-09configureable 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.
2015-06-09do 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.
2015-06-09support 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
2015-05-22Merge remote-tracking branch 'upstream/debian/jessie' into debian/sidMichael Vogt
Conflicts: apt-pkg/deb/dpkgpm.cc
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
2015-05-22Fix 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
2015-05-18treat 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.
2015-05-12detect 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.
2015-05-11sync 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.
2015-05-11remove 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.
2015-04-22remove "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
2015-04-19a hit on Release files means the indexes will be hits tooDavid Kalnischkies
If we get a IMSHit for the Transaction-Manager (= the InRelease file or as its still supported fallback Release + Release.gpg combo) we can assume that every file we would queue based on this manager, but already have locally is current and hence would get an IMSHit, too. We therefore save us and the server the trouble and skip the queuing in this case. Beside speeding up repetative executions of 'apt-get update' this way we also avoid hitting hashsum errors if the indexes are in fact already updated, but the Release file isn't yet as it is the case on well behaving mirrors as Release files is updated last. The implementation is a bit harder than the theory makes it sound as we still have to keep reverifying the Release files (e.g. to detect now expired once to avoid an attacker being able to silently stale us) and have to handle cases in which the Release file hits, but some indexes aren't present (e.g. user added a new foreign architecture).
2015-04-19ensure lists/ files have correct permissions after apt-cdrom addDavid Kalnischkies
Its a bit unpredictable which permissons and owners we will encounter on a CD-ROM (or a USB stick, as apt-cdrom is responsible for those too), so we have to ensure in this codepath as well that everything is nicely setup without waiting for a 'apt-get update' to fix up the (potential) mess.
2015-04-19calculate hashes while downloading in httpsDavid Kalnischkies
We do this in HTTP already to give the CPU some exercise while the disk is heavily spinning (or flashing?) to store the data avoiding the need to reread the entire file again later on to calculate the hashes – which happens outside of the eyes of progress reporting, so you might ended up with a bunch of https workers 'stuck' at 100% while they were busy calculating hashes. This is a bummer for everyone using apt as a connection speedtest as the https method works slower now (not really, it just isn't reporting done too early anymore).
2015-04-19calculate only expected hashes in methodsDavid Kalnischkies
Methods get told which hashes are expected by the acquire system, which means we can use this list to restrict what we calculate in the methods as any extra we are calculating is wasted effort as we can't compare it with anything anyway. Adding support for a new hash algorithm is therefore 'free' now and if a algorithm is no longer provided in a repository for a file, we automatically stop calculating it. In practice this results in a speed-up in Debian as we don't have SHA512 here (so far), so we practically stop calculating it.
2015-04-19handle servers closing encoded connections correctlyDavid Kalnischkies
Servers who advertise that they close the connection get the 'Closes' encoding flag, but this conflicts with servers who response with a transfer-encoding (e.g. encoding) as it is saved in the same flag. We have a better flag for the keep-alive (or not) of the connection anyway, so we check this instead of the encoding. This is in practice not much of a problem as real servers we talk to are HTTP1.1 servers (with keep-alive) and there isn't much point in doing chunked encoding if you are going to close anyway, but our simple testserver stumbles over this if pressed and its a bit cleaner, too. Git-Dch: Ignore
2015-04-19send Alt-* info for uncompressed based on any compressionsDavid Kalnischkies
file sends information about the uncompressed file if it can find it as well as for the compressed file. This was done only for gzip so far, but we support more compression types. That this information isn't used a lot is a different story. Git-Dch: Ignore
2015-04-19improve https method queue progress reportingDavid Kalnischkies
The worker expects that the methods tell him when they start or finish downloading a file. Various information pieces are passed along in this report including the (expected) filesize. https was using a "global" struct for reporting which made it 'reuse' incorrect values in some cases like a non-existent InRelease fallbacking to Release{,.gpg} resulting in a size-mismatch warning. Reducing the scope and redesigning the setting of the values we can fix this and related issues. Closes: 777565, 781509 Thanks: Robert Edmonds and Anders Kaseorg for initial patchs
2015-04-19demote missing gtest to a buildtime warningDavid Kalnischkies
We just need it for unit tests and our debian/rules file actually skips calling them if nocheck is given… but this fails anyhow as we declared a hard-dependency on it. Demoting the error to a warning in configuration and adding a test in the 'make test' path with a friendly message allows nocheck to be useful again. (Running unit tests is fully encouraged of course, but bootstrappers and co do not need to be burdened with this stuff)
2015-04-12parse specific-arch dependencies correctly on single-arch systemsDavid Kalnischkies
On single-arch the parsing was creating groupnames like 'apt:amd64' even through it should be 'apt' and a package in it belonging to architecture amd64. The result for foreign architectures was as expected: The dependency isn't satisfiable, but for native architecture it means the wrong package (ala apt:amd64:amd64) is linked so this is also not satisfiable, which is very much not expected. No longer excluding single-arch from this codepath allows the generation of the correct links, which still link to non-exisiting packages for foreign dependencies, but natives link to the expected native package just as if no architecture was given. For negative arch-specific dependencies ala Conflicts this matter was worse as apt will believe there isn't a Conflict to resolve, tricking it into calculating a solution dpkg will refuse. Architecture specific positive dependencies are rare in jessie – the only one in amd64 main is foreign –, negative dependencies do not even exist. Neither class has a native specimen, so no package in jessie is effected by this bug, but it might be interesting for stretch upgrades. This also means the regression potential is very low. Closes: 777760
2015-04-10test for or-group choice behaviour in upgradeDavid Kalnischkies
In #780028 we were discussing how the or-group order should be more important than keep-back decisions of 'upgrade'. We have this behaviour, but to ensure it stays this way lets add a test for it. Git-Dch: Ignore
2015-04-10add a simple unit test for acquire progressDavid Kalnischkies
This isn't testing much of the 'complex' parts, but its better than nothing for now. Git-Dch: Ignore
2015-04-10reimplement the last uses of sprintfDavid Kalnischkies
Working with strings c-style is complicated and error-prune, so by converting to c++ style we gain some simplicity and avoid buffer overflows by later extensions. Git-Dch: Ignore