diff options
Diffstat (limited to 'apt-pkg/algorithms.cc')
| -rw-r--r-- | apt-pkg/algorithms.cc | 183 |
1 files changed, 183 insertions, 0 deletions
diff --git a/apt-pkg/algorithms.cc b/apt-pkg/algorithms.cc index cd09a6944..702030943 100644 --- a/apt-pkg/algorithms.cc +++ b/apt-pkg/algorithms.cc @@ -16,20 +16,32 @@ #include <config.h> #include <apt-pkg/algorithms.h> +#include <apt-pkg/cachefilter.h> #include <apt-pkg/configuration.h> #include <apt-pkg/depcache.h> #include <apt-pkg/dpkgpm.h> #include <apt-pkg/edsp.h> #include <apt-pkg/error.h> +#include <apt-pkg/macros.h> #include <apt-pkg/packagemanager.h> #include <apt-pkg/pkgcache.h> +#include <apt-pkg/string_view.h> +#include <apt-pkg/strutl.h> +#include <apt-pkg/version.h> + #include <apt-pkg/prettyprinters.h> #include <cstdlib> #include <iostream> +#include <map> +#include <regex> +#include <set> +#include <sstream> #include <string> #include <utility> +#include <vector> #include <string.h> +#include <sys/utsname.h> #include <apti18n.h> /*}}}*/ @@ -1442,3 +1454,174 @@ void pkgPrioSortList(pkgCache &Cache,pkgCache::Version **List) std::sort(List,List+Count,PrioComp(Cache)); } /*}}}*/ + +namespace APT +{ + +namespace KernelAutoRemoveHelper +{ + +// \brief Returns the uname from a kernel package name, or "" for non-kernel packages. +std::string getUname(std::string const &packageName) +{ + + static const constexpr char *const prefixes[] = { + "linux-image-", + "kfreebsd-image-", + "gnumach-image-", + }; + + for (auto prefix : prefixes) + { + if (likely(not APT::String::Startswith(packageName, prefix))) + continue; + if (unlikely(APT::String::Endswith(packageName, "-dbgsym"))) + continue; + if (unlikely(APT::String::Endswith(packageName, "-dbg"))) + continue; + + auto aUname = packageName.substr(strlen(prefix)); + + // aUname must start with [0-9]+\. + if (aUname.length() < 2) + continue; + if (strchr("0123456789", aUname[0]) == nullptr) + continue; + auto dot = aUname.find_first_not_of("0123456789"); + if (dot == aUname.npos || aUname[dot] != '.') + continue; + + return aUname; + } + + return ""; +} +std::string GetProtectedKernelsRegex(pkgCache *cache, bool ReturnRemove) +{ + if (_config->FindB("APT::Protect-Kernels", true) == false) + return ""; + + struct CompareKernel + { + pkgCache *cache; + bool operator()(const std::string &a, const std::string &b) const + { + return cache->VS->CmpVersion(a, b) < 0; + } + }; + bool Debug = _config->FindB("Debug::pkgAutoRemove", false); + // kernel version -> list of unames + std::map<std::string, std::vector<std::string>, CompareKernel> version2unames(CompareKernel{cache}); + // needs to be initialized to 0s, might not be set up. + utsname uts{}; + std::string bootedVersion; + std::string lastInstalledVersion; + + std::string lastInstalledUname = _config->Find("APT::LastInstalledKernel"); + + // Get currently booted version, but only when not on reproducible build. + if (getenv("SOURCE_DATE_EPOCH") == 0) + { + if (uname(&uts) != 0) + abort(); + } + + auto VirtualKernelPkg = cache->FindPkg("$kernel", "any"); + if (VirtualKernelPkg.end()) + return ""; + + for (pkgCache::PrvIterator Prv = VirtualKernelPkg.ProvidesList(); Prv.end() == false; ++Prv) + { + auto Pkg = Prv.OwnerPkg(); + if (likely(Pkg->CurrentVer == 0)) + continue; + + auto pkgUname = APT::KernelAutoRemoveHelper::getUname(Pkg.Name()); + auto pkgVersion = Pkg.CurrentVer().VerStr(); + + if (pkgUname.empty()) + continue; + + if (Debug) + std::clog << "Found kernel " << pkgUname << "(" << pkgVersion << ")" << std::endl; + + version2unames[pkgVersion].push_back(pkgUname); + + if (pkgUname == uts.release) + bootedVersion = pkgVersion; + if (pkgUname == lastInstalledUname) + lastInstalledVersion = pkgVersion; + } + + if (version2unames.size() == 0) + return ""; + + auto latest = version2unames.rbegin(); + auto previous = latest; + ++previous; + + std::set<std::string> keep; + + if (not bootedVersion.empty()) + { + if (Debug || false) + std::clog << "Keeping booted kernel " << bootedVersion << std::endl; + keep.insert(bootedVersion); + } + if (not lastInstalledVersion.empty()) + { + if (Debug || false) + std::clog << "Keeping installed kernel " << lastInstalledVersion << std::endl; + keep.insert(lastInstalledVersion); + } + if (latest != version2unames.rend()) + { + if (Debug || false) + std::clog << "Keeping latest kernel " << latest->first << std::endl; + keep.insert(latest->first); + } + if (previous != version2unames.rend()) + { + if (Debug) + std::clog << "Keeping previous kernel " << previous->first << std::endl; + keep.insert(previous->first); + } + + std::regex special("([\\.\\+])"); + std::ostringstream ss; + for (auto &pattern : _config->FindVector("APT::VersionedKernelPackages")) + { + // Legacy compatibility: Always protected the booted uname and last installed uname + if (not lastInstalledUname.empty()) + ss << "|^" << pattern << "-" << std::regex_replace(lastInstalledUname, special, "\\$1") << "$"; + if (*uts.release) + ss << "|^" << pattern << "-" << std::regex_replace(uts.release, special, "\\$1") << "$"; + for (auto const &kernel : version2unames) + { + if (ReturnRemove ? keep.find(kernel.first) == keep.end() : keep.find(kernel.first) != keep.end()) + { + for (auto const &uname : kernel.second) + ss << "|^" << pattern << "-" << std::regex_replace(uname, special, "\\$1") << "$"; + } + } + } + + auto re = ss.str().substr(1); + if (Debug) + std::clog << "Kernel protection regex: " << re << "\n"; + + return re; +} + +std::unique_ptr<APT::CacheFilter::Matcher> GetProtectedKernelsFilter(pkgCache *cache, bool returnRemove) +{ + auto regex = GetProtectedKernelsRegex(cache, returnRemove); + + if (regex.empty()) + return std::make_unique<APT::CacheFilter::FalseMatcher>(); + + return std::make_unique<APT::CacheFilter::PackageNameMatchesRegEx>(regex); +} + +} // namespace KernelAutoRemoveHelper +} // namespace APT |