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nix why-depends: Fix showing self-references

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This commit is contained in:
Eelco Dolstra 2017-09-14 11:17:32 +02:00
parent 359ede1d72
commit 1c58ad2ffa
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GPG key ID: 8170B4726D7198DE
1 changed files with 16 additions and 8 deletions
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24
src/nix/why-depends.cc
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@ -1,6 +1,4 @@
#include "command.hh" #include "command.hh"
#include "common-args.hh"
#include "shared.hh"
#include "store-api.hh" #include "store-api.hh"
#include "progress-bar.hh" #include "progress-bar.hh"
#include "fs-accessor.hh" #include "fs-accessor.hh"
@ -59,9 +57,17 @@ struct CmdWhyDepends : SourceExprCommand
{ {
return { return {
Example{ Example{
"To show which files in Hello's closure depend on Glibc:", "To show one path through the dependency graph leading from Hello to Glibc:",
"nix why-depends nixpkgs.hello nixpkgs.glibc" "nix why-depends nixpkgs.hello nixpkgs.glibc"
}, },
Example{
"To show all files and paths in the dependency graph leading from Thunderbird to libX11:",
"nix why-depends --all nixpkgs.thunderbird nixpkgs.xorg.libX11"
},
Example{
"To show why Glibc depends on itself:",
"nix why-depends nixpkgs.glibc nixpkgs.glibc"
},
}; };
} }
@ -141,9 +147,9 @@ struct CmdWhyDepends : SourceExprCommand
and `dependency`. */ and `dependency`. */
std::function<void(Node &, const string &, const string &)> printNode; std::function<void(Node &, const string &, const string &)> printNode;
const string treeConn = "├───"; const string treeConn = "╠═══";
const string treeLast = "└───"; const string treeLast = "╚═══";
const string treeLine = "│ "; const string treeLine = "║ ";
const string treeNull = " "; const string treeNull = " ";
struct BailOut { }; struct BailOut { };
@ -156,7 +162,9 @@ struct CmdWhyDepends : SourceExprCommand
firstPad != "" ? "=> " : "", firstPad != "" ? "=> " : "",
node.path); node.path);
if (node.path == dependencyPath && !all) throw BailOut(); if (node.path == dependencyPath && !all
&& packagePath != dependencyPath)
throw BailOut();
if (node.visited) return; if (node.visited) return;
node.visited = true; node.visited = true;
@ -167,7 +175,7 @@ struct CmdWhyDepends : SourceExprCommand
std::set<std::string> hashes; std::set<std::string> hashes;
for (auto & ref : node.refs) { for (auto & ref : node.refs) {
if (ref == node.path) continue; if (ref == node.path && packagePath != dependencyPath) continue;
auto & node2 = graph.at(ref); auto & node2 = graph.at(ref);
if (node2.dist == inf) continue; if (node2.dist == inf) continue;
refs.emplace(node2.dist, &node2); refs.emplace(node2.dist, &node2);