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https://github.com/privatevoid-net/nix-super.git
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6526d1676b
Pos objects are somewhat wasteful as they duplicate the origin file name and input type for each object. on files that produce more than one Pos when parsed this a sizeable waste of memory (one pointer per Pos). the same goes for ptr<Pos> on 64 bit machines: parsing enough source to require 8 bytes to locate a position would need at least 8GB of input and 64GB of expression memory. it's not likely that we'll hit that any time soon, so we can use a uint32_t index to locate positions instead.
93 lines
3.2 KiB
C++
93 lines
3.2 KiB
C++
#include "primops.hh"
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#include "eval-inline.hh"
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#include "store-api.hh"
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#include "fetchers.hh"
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#include "url.hh"
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#include "url-parts.hh"
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namespace nix {
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static void prim_fetchMercurial(EvalState & state, const PosIdx pos, Value * * args, Value & v)
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{
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std::string url;
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std::optional<Hash> rev;
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std::optional<std::string> ref;
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std::string_view name = "source";
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PathSet context;
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state.forceValue(*args[0], pos);
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if (args[0]->type() == nAttrs) {
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state.forceAttrs(*args[0], pos);
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for (auto & attr : *args[0]->attrs) {
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std::string_view n(attr.name);
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if (n == "url")
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url = state.coerceToString(attr.pos, *attr.value, context, false, false).toOwned();
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else if (n == "rev") {
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// Ugly: unlike fetchGit, here the "rev" attribute can
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// be both a revision or a branch/tag name.
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auto value = state.forceStringNoCtx(*attr.value, attr.pos);
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if (std::regex_match(value.begin(), value.end(), revRegex))
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rev = Hash::parseAny(value, htSHA1);
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else
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ref = value;
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}
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else if (n == "name")
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name = state.forceStringNoCtx(*attr.value, attr.pos);
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else
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throw EvalError({
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.msg = hintfmt("unsupported argument '%s' to 'fetchMercurial'", attr.name),
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.errPos = state.positions[attr.pos]
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});
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}
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if (url.empty())
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throw EvalError({
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.msg = hintfmt("'url' argument required"),
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.errPos = state.positions[pos]
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});
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} else
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url = state.coerceToString(pos, *args[0], context, false, false).toOwned();
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// FIXME: git externals probably can be used to bypass the URI
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// whitelist. Ah well.
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state.checkURI(url);
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if (evalSettings.pureEval && !rev)
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throw Error("in pure evaluation mode, 'fetchMercurial' requires a Mercurial revision");
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fetchers::Attrs attrs;
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attrs.insert_or_assign("type", "hg");
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attrs.insert_or_assign("url", url.find("://") != std::string::npos ? url : "file://" + url);
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attrs.insert_or_assign("name", std::string(name));
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if (ref) attrs.insert_or_assign("ref", *ref);
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if (rev) attrs.insert_or_assign("rev", rev->gitRev());
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auto input = fetchers::Input::fromAttrs(std::move(attrs));
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// FIXME: use name
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auto [tree, input2] = input.fetch(state.store);
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auto attrs2 = state.buildBindings(8);
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auto storePath = state.store->printStorePath(tree.storePath);
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attrs2.alloc(state.sOutPath).mkString(storePath, {storePath});
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if (input2.getRef())
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attrs2.alloc("branch").mkString(*input2.getRef());
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// Backward compatibility: set 'rev' to
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// 0000000000000000000000000000000000000000 for a dirty tree.
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auto rev2 = input2.getRev().value_or(Hash(htSHA1));
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attrs2.alloc("rev").mkString(rev2.gitRev());
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attrs2.alloc("shortRev").mkString(rev2.gitRev().substr(0, 12));
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if (auto revCount = input2.getRevCount())
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attrs2.alloc("revCount").mkInt(*revCount);
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v.mkAttrs(attrs2);
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state.allowPath(tree.storePath);
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}
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static RegisterPrimOp r_fetchMercurial("fetchMercurial", 1, prim_fetchMercurial);
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}
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