nix/why-depends: fix output when not using --precise
On Nix 2.6 the output of `nix why-depends --all` seems to be somewhat off: $ nix why-depends /nix/store/kn47hayxab8gc01jhr98dwyywbx561aq-nixos-system-roflmayr-21.11.20220207.6c202a9.drv /nix/store/srn5jbs1q30jpybdmxqrwskyny659qgc-nix-2.6.drv --derivation --extra-experimental-features nix-command --all /nix/store/kn47hayxab8gc01jhr98dwyywbx561aq-nixos-system-roflmayr-21.11.20220207.6c202a9.drv └───/nix/store/g8bpgfjhh5vxrdq0w6r6s64f9kkm9z6c-etc.drv │ └───/nix/store/hm0jmhp8shbf3cl846a685nv4f5cp3fy-nspawn-inst.drv | [...] └───/nix/store/2d6q3ygiim9ijl5d4h0qqx6vnjgxywyr-system-units.drv └───/nix/store/dil014y1b8qyjhhhf5fpaah5fzdf0bzs-unit-systemd-nspawn-hydra.service.drv └───/nix/store/a9r72wwx8qrxyp7hjydyg0gsrwnn26zb-activate.drv └───/nix/store/99hlc7i4gl77wq087lbhag4hkf3kvssj-nixos-system-hydra-21.11pre-git.drv Please note that `[...]-system-units.drv` is supposed to be a direct child of `[...]-etc.drv`. The reason for that is that each new level printed by `printNode` is four spaces off in comparison to `nix why-depends --precise` because the recursive `printNode()` only prints the path and not the `tree*`-chars in the case of `--precise` and in this format the path is four spaces further indented, i.e. on a newline, but on the same level as the path's children, i.e. /nix/store/kn47hayxab8gc01jhr98dwyywbx561aq-nixos-system-roflmayr-21.11.20220207.6c202a9.drv └───/: …1-p8.drv",["out"]),("/nix/store/g8bpgfjhh5vxrdq0w6r6s64f9kkm9z6c-etc.drv",["out"]),("/nix/store/… → /nix/store/g8bpgfjhh5vxrdq0w6r6s64f9kkm9z6c-etc.drv As you can see `[...]-etc.drv` is a direct child of the root, but four spaces indented. This logic was directly applied to the code-path with `precise=false` which resulted in `tree*` being printed four spaces too deep. In case of no `--precise`, `hits[hash]` is empty and the path itself should be printed rather than hits using the same logic as for `hits[hash]`. With this fix, the output looks correct now: /nix/store/kn47hayxab8gc01jhr98dwyywbx561aq-nixos-system-roflmayr-21.11.20220207.6c202a9.drv └───/nix/store/g8bpgfjhh5vxrdq0w6r6s64f9kkm9z6c-etc.drv ├───/nix/store/hm0jmhp8shbf3cl846a685nv4f5cp3fy-nspawn-inst.drv | [...] └───/nix/store/2d6q3ygiim9ijl5d4h0qqx6vnjgxywyr-system-units.drv └───/nix/store/dil014y1b8qyjhhhf5fpaah5fzdf0bzs-unit-systemd-nspawn-hydra.service.drv └───/nix/store/a9r72wwx8qrxyp7hjydyg0gsrwnn26zb-activate.drv └───/nix/store/99hlc7i4gl77wq087lbhag4hkf3kvssj-nixos-system-hydra-21.11pre-git.drv
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@ -171,12 +171,6 @@ struct CmdWhyDepends : SourceExprCommand
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node.visited ? "\e[38;5;244m" : "",
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firstPad != "" ? "→ " : "",
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pathS);
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} else {
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logger->cout("%s%s%s%s" ANSI_NORMAL,
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firstPad,
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node.visited ? "\e[38;5;244m" : "",
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firstPad != "" ? treeLast : "",
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pathS);
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}
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if (node.path == dependencyPath && !all
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@ -184,7 +178,7 @@ struct CmdWhyDepends : SourceExprCommand
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throw BailOut();
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if (node.visited) return;
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node.visited = true;
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if (precise) node.visited = true;
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/* Sort the references by distance to `dependency` to
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ensure that the shortest path is printed first. */
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@ -267,6 +261,16 @@ struct CmdWhyDepends : SourceExprCommand
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if (!all) break;
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}
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if (!precise) {
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auto pathS = store->printStorePath(ref.second->path);
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logger->cout("%s%s%s%s" ANSI_NORMAL,
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firstPad,
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ref.second->visited ? "\e[38;5;244m" : "",
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last ? treeLast : treeConn,
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pathS);
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node.visited = true;
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}
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printNode(*ref.second,
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tailPad + (last ? treeNull : treeLine),
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tailPad + (last ? treeNull : treeLine));
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@ -275,6 +279,9 @@ struct CmdWhyDepends : SourceExprCommand
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RunPager pager;
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try {
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if (!precise) {
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logger->cout("%s", store->printStorePath(graph.at(packagePath).path));
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}
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printNode(graph.at(packagePath), "", "");
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} catch (BailOut & ) { }
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}
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