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-rw-r--r--test/interactive-helper/longest-dependency-chain.cc72
1 files changed, 72 insertions, 0 deletions
diff --git a/test/interactive-helper/longest-dependency-chain.cc b/test/interactive-helper/longest-dependency-chain.cc
new file mode 100644
index 0000000..3da722a
--- /dev/null
+++ b/test/interactive-helper/longest-dependency-chain.cc
@@ -0,0 +1,72 @@
+#include <config.h>
+
+#include <apt-pkg/cachefile.h>
+#include <apt-pkg/pkgsystem.h>
+#include <apt-private/private-cmndline.h>
+
+#include <iostream>
+
+static bool ShowHelp(CommandLine &) /*{{{*/
+{
+ std::cout <<
+ "Usage: longest-dependecy-chain [options]\n"
+ "\n"
+ "Tries to find the longest dependency chain available in the data\n"
+ "assuming an empty status file, no conflicts, all or-group members\n"
+ "are followed and discovery order matters. In other words:\n"
+ "The found length might very well be too short and not realistic.\n"
+ "It is also not implemented very intelligently, so it runs forever.\n";
+ return true;
+}
+ /*}}}*/
+static std::vector<aptDispatchWithHelp> GetCommands() /*{{{*/
+{
+ return {
+ {nullptr, nullptr, nullptr}
+ };
+}
+ /*}}}*/
+static size_t findLongestInstallChain(pkgDepCache &Cache, pkgCache::PkgIterator const &Pkg, std::vector<bool> &installed)/*{{{*/
+{
+ if (installed[Pkg->ID])
+ return 0;
+ installed[Pkg->ID] = true;
+
+ auto const Ver = Cache.GetCandidateVersion(Pkg);
+ if (Ver.end())
+ return 0;
+
+ size_t maxdepth = 0;
+ for (auto D = Ver.DependsList(); not D.end(); ++D)
+ if (D->Type == pkgCache::Dep::Depends ||
+ D->Type == pkgCache::Dep::PreDepends ||
+ D->Type == pkgCache::Dep::Recommends ||
+ D->Type == pkgCache::Dep::Suggests)
+ maxdepth = std::max(maxdepth, findLongestInstallChain(Cache, D.TargetPkg(), installed));
+ return maxdepth + 1;
+}
+ /*}}}*/
+int main(int argc,const char *argv[]) /*{{{*/
+{
+ CommandLine CmdL;
+ auto const Cmds = ParseCommandLine(CmdL, APT_CMD::APT_SORTPKG, &_config, &_system, argc, argv, &ShowHelp, &GetCommands);
+ _config->Set("dir::state::status", "/dev/null");
+
+ pkgCacheFile CacheFile;
+ CacheFile.InhibitActionGroups(true);
+ pkgDepCache * const Cache = CacheFile.GetDepCache();
+ if (unlikely(Cache == nullptr))
+ return DispatchCommandLine(CmdL, Cmds);
+
+ size_t maxdepth = 0;
+ for (auto P = Cache->PkgBegin(); not P.end(); ++P)
+ {
+ std::vector<bool> installed(Cache->Head().PackageCount, false);
+ auto const depth = findLongestInstallChain(*Cache, P, installed);
+ std::cout << depth << ' ' << P.FullName() << '\n';
+ maxdepth = std::max(maxdepth, depth);
+ }
+
+ return 0;
+}
+ /*}}}*/