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Add fetchSubmodules to builtins.fetchGit

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There are some downsides to this features:

 - Submodules are not cached (unlike the root repo),
 - Full checkouts are created in a temporary directory.
This commit is contained in:
Julian Stecklina 2019-10-25 17:45:14 +02:00 committed by Julian Stecklina
parent eb1911e277
commit f58604ac32
1 changed files with 35 additions and 10 deletions
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45
src/libexpr/primops/fetchGit.cc
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@ -22,13 +22,14 @@ struct GitInfo
std::string rev;
std::string shortRev;
uint64_t revCount = 0;
bool submodules = false;
};
std::regex revRegex("^[0-9a-fA-F]{40}$");
GitInfo exportGit(ref<Store> store, const std::string & uri,
std::optional<std::string> ref, std::string rev,
const std::string & name)
const std::string & name, bool fetchSubmodules)
{
if (evalSettings.pureEval && rev == "")
throw Error("in pure evaluation mode, 'fetchGit' requires a Git revision");
@ -145,7 +146,8 @@ GitInfo exportGit(ref<Store> store, const std::string & uri,
printTalkative("using revision %s of repo '%s'", gitInfo.rev, uri);
std::string storeLinkName = hashString(htSHA512, name + std::string("\0"s) + gitInfo.rev).to_string(Base32, false);
std::string storeLinkName = hashString(htSHA512, name + std::string("\0"s) + gitInfo.rev
+ (fetchSubmodules ? "submodules" : "")).to_string(Base32, false);
Path storeLink = cacheDir + "/" + storeLinkName + ".link";
PathLocks storeLinkLock({storeLink}, fmt("waiting for lock on '%1%'...", storeLink)); // FIXME: broken
@ -165,16 +167,35 @@ GitInfo exportGit(ref<Store> store, const std::string & uri,
if (e.errNo != ENOENT) throw;
}
auto source = sinkToSource([&](Sink & sink) {
RunOptions gitOptions("git", { "-C", cacheDir, "archive", gitInfo.rev });
gitOptions.standardOut = &sink;
runProgram2(gitOptions);
});
Path tmpDir = createTempDir();
AutoDelete delTmpDir(tmpDir, true);
unpackTarfile(*source, tmpDir);
// Submodule support can be improved by adding caching to the submodules themselves. At the moment, only the root
// repo is cached.
if (fetchSubmodules) {
Path tmpGitDir = createTempDir();
AutoDelete delTmpGitDir(tmpGitDir, true);
runProgram("git", true, { "init", tmpDir, "--separate-git-dir", tmpGitDir });
runProgram("git", true, { "-C", tmpDir, "fetch", "--quiet", "--force",
"--", cacheDir, fmt("%s:%s", *ref, *ref) });
runProgram("git", true, { "-C", tmpDir, "checkout", "--quiet", "FETCH_HEAD" });
runProgram("git", true, { "-C", tmpDir, "remote", "add", "origin", uri });
runProgram("git", true, { "-C", tmpDir, "submodule", "--quiet", "update", "--init" });
deletePath(tmpDir + "/.git");
gitInfo.submodules = true;
} else {
auto source = sinkToSource([&](Sink & sink) {
RunOptions gitOptions("git", { "-C", cacheDir, "archive", gitInfo.rev });
gitOptions.standardOut = &sink;
runProgram2(gitOptions);
});
unpackTarfile(*source, tmpDir);
}
gitInfo.storePath = store->printStorePath(store->addToStore(name, tmpDir));
@ -198,6 +219,7 @@ static void prim_fetchGit(EvalState & state, const Pos & pos, Value * * args, Va
std::optional<std::string> ref;
std::string rev;
std::string name = "source";
bool fetchSubmodules = false;
PathSet context;
state.forceValue(*args[0]);
@ -216,6 +238,8 @@ static void prim_fetchGit(EvalState & state, const Pos & pos, Value * * args, Va
rev = state.forceStringNoCtx(*attr.value, *attr.pos);
else if (n == "name")
name = state.forceStringNoCtx(*attr.value, *attr.pos);
else if (n == "fetchSubmodules")
fetchSubmodules = state.forceBool(*attr.value, *attr.pos);
else
throw EvalError("unsupported argument '%s' to 'fetchGit', at %s", attr.name, *attr.pos);
}
@ -230,13 +254,14 @@ static void prim_fetchGit(EvalState & state, const Pos & pos, Value * * args, Va
// whitelist. Ah well.
state.checkURI(url);
auto gitInfo = exportGit(state.store, url, ref, rev, name);
auto gitInfo = exportGit(state.store, url, ref, rev, name, fetchSubmodules);
state.mkAttrs(v, 8);
mkString(*state.allocAttr(v, state.sOutPath), gitInfo.storePath, PathSet({gitInfo.storePath}));
mkString(*state.allocAttr(v, state.symbols.create("rev")), gitInfo.rev);
mkString(*state.allocAttr(v, state.symbols.create("shortRev")), gitInfo.shortRev);
mkInt(*state.allocAttr(v, state.symbols.create("revCount")), gitInfo.revCount);
mkBool(*state.allocAttr(v, state.symbols.create("submodules")), gitInfo.submodules);
v.attrs->sort();
if (state.allowedPaths)