forked from lix-project/lix
78 lines
2.3 KiB
C++
78 lines
2.3 KiB
C++
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#include "primops.hh"
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#include "eval-inline.hh"
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#include "download.hh"
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#include "store-api.hh"
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namespace nix {
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static void prim_fetchgit(EvalState & state, const Pos & pos, Value * * args, Value & v)
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{
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// FIXME: cut&paste from fetch().
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if (state.restricted) throw Error("‘fetchgit’ is not allowed in restricted mode");
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std::string url;
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std::string rev = "master";
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state.forceValue(*args[0]);
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if (args[0]->type == tAttrs) {
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state.forceAttrs(*args[0], pos);
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for (auto & attr : *args[0]->attrs) {
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string name(attr.name);
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if (name == "url")
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url = state.forceStringNoCtx(*attr.value, *attr.pos);
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else if (name == "rev")
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rev = state.forceStringNoCtx(*attr.value, *attr.pos);
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else
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throw EvalError(format("unsupported argument ‘%1%’ to ‘fetchgit’, at %3%") % attr.name % attr.pos);
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}
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if (url.empty())
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throw EvalError(format("‘url’ argument required, at %1%") % pos);
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} else
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url = state.forceStringNoCtx(*args[0], pos);
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if (!isUri(url))
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throw EvalError(format("‘%s’ is not a valid URI, at %s") % url % pos);
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Path cacheDir = getCacheDir() + "/nix/git";
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if (!pathExists(cacheDir)) {
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createDirs(cacheDir);
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runProgram("git", true, { "init", "--bare", cacheDir });
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}
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Activity act(*logger, lvlInfo, format("fetching Git repository ‘%s’") % url);
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std::string localRef = "pid-" + std::to_string(getpid());
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Path localRefFile = cacheDir + "/refs/heads/" + localRef;
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runProgram("git", true, { "-C", cacheDir, "fetch", url, rev + ":" + localRef });
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std::string commitHash = chomp(readFile(localRefFile));
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unlink(localRefFile.c_str());
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debug(format("got revision ‘%s’") % commitHash);
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// FIXME: should pipe this, or find some better way to extract a
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// revision.
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auto tar = runProgram("git", true, { "-C", cacheDir, "archive", commitHash });
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Path tmpDir = createTempDir();
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AutoDelete delTmpDir(tmpDir, true);
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runProgram("tar", true, { "x", "-C", tmpDir }, tar);
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Path storePath = state.store->addToStore("git-export", tmpDir);
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mkString(v, storePath, PathSet({storePath}));
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}
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static RegisterPrimOp r("__fetchgit", 1, prim_fetchgit);
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}
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