mirror of
https://github.com/privatevoid-net/nix-super.git
synced 2024-11-23 22:46:16 +02:00
GitInputScheme: Use FSInputAccessor for local trees
This commit is contained in:
Eelco Dolstra
parent
38c665847a
commit
631ae8df6d
1 changed files with 178 additions and 122 deletions
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@ -122,11 +122,11 @@ struct GitInputScheme : InputScheme
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void clone(const Input & input, const Path & destDir) override
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{
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auto [isLocal, actualUrl] = getActualUrl(input);
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auto repoInfo = getRepoInfo(input);
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Strings args = {"clone"};
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args.push_back(actualUrl);
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args.push_back(repoInfo.url);
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if (auto ref = input.getRef()) {
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args.push_back("--branch");
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@ -161,8 +161,51 @@ struct GitInputScheme : InputScheme
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{ "-C", *sourcePath, "commit", std::string(file), "-m", *commitMsg });
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}
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std::pair<bool, std::string> getActualUrl(const Input & input) const
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struct RepoInfo
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{
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bool shallow = false;
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bool submodules = false;
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bool allRefs = false;
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std::string cacheType;
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/* Whether this is a local, non-bare repository. */
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bool isLocal = false;
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/* Whether this is a local, non-bare, dirty repository. */
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bool isDirty = false;
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/* Whether this repository has any commits. */
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bool hasHead = true;
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/* URL of the repo, or its path if isLocal. */
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std::string url;
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void checkDirty()
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{
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if (isDirty) {
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if (!fetchSettings.allowDirty)
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throw Error("Git tree '%s' is dirty", url);
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if (fetchSettings.warnDirty)
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warn("Git tree '%s' is dirty", url);
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}
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}
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};
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RepoInfo getRepoInfo(const Input & input)
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{
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RepoInfo repoInfo;
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repoInfo.shallow = maybeGetBoolAttr(input.attrs, "shallow").value_or(false);
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repoInfo.submodules = maybeGetBoolAttr(input.attrs, "submodules").value_or(false);
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repoInfo.allRefs = maybeGetBoolAttr(input.attrs, "allRefs").value_or(false);
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repoInfo.cacheType = "git";
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if (repoInfo.shallow) repoInfo.cacheType += "-shallow";
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if (repoInfo.submodules) repoInfo.cacheType += "-submodules";
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if (repoInfo.allRefs) repoInfo.cacheType += "-all-refs";
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// file:// URIs are normally not cloned (but otherwise treated the
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// same as remote URIs, i.e. we don't use the working tree or
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// HEAD). Exception: If _NIX_FORCE_HTTP is set, or the repo is a bare git
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@ -170,29 +213,90 @@ struct GitInputScheme : InputScheme
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static bool forceHttp = getEnv("_NIX_FORCE_HTTP") == "1"; // for testing
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auto url = parseURL(getStrAttr(input.attrs, "url"));
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bool isBareRepository = url.scheme == "file" && !pathExists(url.path + "/.git");
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bool isLocal = url.scheme == "file" && !forceHttp && !isBareRepository;
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return {isLocal, isLocal ? url.path : url.base};
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repoInfo.isLocal = url.scheme == "file" && !forceHttp && !isBareRepository;
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repoInfo.url = repoInfo.isLocal ? url.path : url.base;
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// If this is a local directory and no ref or revision is
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// given, then allow the use of an unclean working tree.
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if (!input.getRef() && !input.getRev() && repoInfo.isLocal) {
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repoInfo.isDirty = true;
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auto env = getEnv();
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/* Set LC_ALL to C: because we rely on the error messages
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from git rev-parse to determine what went wrong that
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way unknown errors can lead to a failure instead of
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continuing through the wrong code path. */
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env["LC_ALL"] = "C";
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/* Check whether HEAD points to something that looks like
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a commit, since that is the ref we want to use later
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on. */
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auto result = runProgram(RunOptions {
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.program = "git",
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.args = { "-C", repoInfo.url, "--git-dir=.git", "rev-parse", "--verify", "--no-revs", "HEAD^{commit}" },
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.environment = env,
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.mergeStderrToStdout = true
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});
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auto exitCode = WEXITSTATUS(result.first);
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auto errorMessage = result.second;
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if (errorMessage.find("fatal: not a git repository") != std::string::npos) {
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throw Error("'%s' is not a Git repository", repoInfo.url);
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} else if (errorMessage.find("fatal: Needed a single revision") != std::string::npos) {
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// indicates that the repo does not have any commits
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// we want to proceed and will consider it dirty later
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} else if (exitCode != 0) {
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// any other errors should lead to a failure
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throw Error("getting the HEAD of the Git tree '%s' failed with exit code %d:\n%s", repoInfo.url, exitCode, errorMessage);
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}
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repoInfo.hasHead = exitCode == 0;
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try {
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if (repoInfo.hasHead) {
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// Using git diff is preferrable over lower-level operations here,
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// because it's conceptually simpler and we only need the exit code anyways.
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auto gitDiffOpts = Strings({ "-C", repoInfo.url, "diff", "HEAD", "--quiet"});
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if (!repoInfo.submodules) {
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// Changes in submodules should only make the tree dirty
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// when those submodules will be copied as well.
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gitDiffOpts.emplace_back("--ignore-submodules");
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}
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gitDiffOpts.emplace_back("--");
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runProgram("git", true, gitDiffOpts);
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repoInfo.isDirty = false;
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}
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} catch (ExecError & e) {
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if (!WIFEXITED(e.status) || WEXITSTATUS(e.status) != 1) throw;
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}
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}
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return repoInfo;
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}
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std::set<std::string> listFiles(const RepoInfo & repoInfo)
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{
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auto gitOpts = Strings({ "-C", repoInfo.url, "ls-files", "-z" });
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if (repoInfo.submodules)
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gitOpts.emplace_back("--recurse-submodules");
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return tokenizeString<std::set<std::string>>(
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runProgram("git", true, gitOpts), "\0"s);
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}
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std::pair<StorePath, Input> fetch(ref<Store> store, const Input & _input) override
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{
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Input input(_input);
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auto repoInfo = getRepoInfo(input);
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std::string name = input.getName();
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bool shallow = maybeGetBoolAttr(input.attrs, "shallow").value_or(false);
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bool submodules = maybeGetBoolAttr(input.attrs, "submodules").value_or(false);
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bool allRefs = maybeGetBoolAttr(input.attrs, "allRefs").value_or(false);
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std::string cacheType = "git";
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if (shallow) cacheType += "-shallow";
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if (submodules) cacheType += "-submodules";
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if (allRefs) cacheType += "-all-refs";
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auto getLockedAttrs = [&]()
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{
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return Attrs({
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{"type", cacheType},
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{"type", repoInfo.cacheType},
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{"name", name},
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{"rev", input.getRev()->gitRev()},
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});
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@ -203,7 +307,7 @@ struct GitInputScheme : InputScheme
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{
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assert(input.getRev());
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assert(!_input.getRev() || _input.getRev() == input.getRev());
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if (!shallow)
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if (!repoInfo.shallow)
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input.attrs.insert_or_assign("revCount", getIntAttr(infoAttrs, "revCount"));
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input.attrs.insert_or_assign("lastModified", getIntAttr(infoAttrs, "lastModified"));
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return {std::move(storePath), input};
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@ -214,80 +318,15 @@ struct GitInputScheme : InputScheme
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return makeResult(res->first, std::move(res->second));
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}
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auto [isLocal, actualUrl_] = getActualUrl(input);
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auto actualUrl = actualUrl_; // work around clang bug
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// If this is a local directory and no ref or revision is
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// given, then allow the use of an unclean working tree.
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if (!input.getRef() && !input.getRev() && isLocal) {
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bool clean = false;
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auto env = getEnv();
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// Set LC_ALL to C: because we rely on the error messages from git rev-parse to determine what went wrong
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// that way unknown errors can lead to a failure instead of continuing through the wrong code path
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env["LC_ALL"] = "C";
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/* Check whether HEAD points to something that looks like a commit,
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since that is the refrence we want to use later on. */
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auto result = runProgram(RunOptions {
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.program = "git",
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.args = { "-C", actualUrl, "--git-dir=.git", "rev-parse", "--verify", "--no-revs", "HEAD^{commit}" },
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.environment = env,
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.mergeStderrToStdout = true
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});
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auto exitCode = WEXITSTATUS(result.first);
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auto errorMessage = result.second;
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if (errorMessage.find("fatal: not a git repository") != std::string::npos) {
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throw Error("'%s' is not a Git repository", actualUrl);
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} else if (errorMessage.find("fatal: Needed a single revision") != std::string::npos) {
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// indicates that the repo does not have any commits
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// we want to proceed and will consider it dirty later
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} else if (exitCode != 0) {
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// any other errors should lead to a failure
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throw Error("getting the HEAD of the Git tree '%s' failed with exit code %d:\n%s", actualUrl, exitCode, errorMessage);
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}
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bool hasHead = exitCode == 0;
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try {
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if (hasHead) {
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// Using git diff is preferrable over lower-level operations here,
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// because its conceptually simpler and we only need the exit code anyways.
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auto gitDiffOpts = Strings({ "-C", actualUrl, "diff", "HEAD", "--quiet"});
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if (!submodules) {
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// Changes in submodules should only make the tree dirty
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// when those submodules will be copied as well.
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gitDiffOpts.emplace_back("--ignore-submodules");
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}
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gitDiffOpts.emplace_back("--");
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runProgram("git", true, gitDiffOpts);
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clean = true;
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}
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} catch (ExecError & e) {
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if (!WIFEXITED(e.status) || WEXITSTATUS(e.status) != 1) throw;
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}
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if (!clean) {
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if (repoInfo.isDirty) {
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/* This is an unclean working tree. So copy all tracked files. */
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repoInfo.checkDirty();
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if (!fetchSettings.allowDirty)
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throw Error("Git tree '%s' is dirty", actualUrl);
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if (fetchSettings.warnDirty)
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warn("Git tree '%s' is dirty", actualUrl);
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auto gitOpts = Strings({ "-C", actualUrl, "ls-files", "-z" });
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if (submodules)
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gitOpts.emplace_back("--recurse-submodules");
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auto files = tokenizeString<std::set<std::string>>(
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runProgram("git", true, gitOpts), "\0"s);
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auto files = listFiles(repoInfo);
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PathFilter filter = [&](const Path & p) -> bool {
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assert(hasPrefix(p, actualUrl));
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std::string file(p, actualUrl.size() + 1);
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assert(hasPrefix(p, repoInfo.url));
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std::string file(p, repoInfo.url.size() + 1);
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auto st = lstat(p);
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@ -300,36 +339,36 @@ struct GitInputScheme : InputScheme
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return files.count(file);
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};
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auto storePath = store->addToStore(input.getName(), actualUrl, FileIngestionMethod::Recursive, htSHA256, filter);
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auto storePath = store->addToStore(input.getName(), repoInfo.url, FileIngestionMethod::Recursive, htSHA256, filter);
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// FIXME: maybe we should use the timestamp of the last
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// modified dirty file?
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input.attrs.insert_or_assign(
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"lastModified",
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hasHead ? std::stoull(runProgram("git", true, { "-C", actualUrl, "log", "-1", "--format=%ct", "--no-show-signature", "HEAD" })) : 0);
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repoInfo.hasHead ? std::stoull(runProgram("git", true, { "-C", repoInfo.url, "log", "-1", "--format=%ct", "--no-show-signature", "HEAD" })) : 0);
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return {std::move(storePath), input};
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}
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}
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if (!input.getRef()) input.attrs.insert_or_assign("ref", isLocal ? readHead(actualUrl) : "master");
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// FIXME: move to getRepoInfo().
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if (!input.getRef()) input.attrs.insert_or_assign("ref", repoInfo.isLocal ? readHead(repoInfo.url) : "master");
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Attrs unlockedAttrs({
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{"type", cacheType},
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{"type", repoInfo.cacheType},
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{"name", name},
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{"url", actualUrl},
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{"url", repoInfo.url},
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{"ref", *input.getRef()},
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});
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Path repoDir;
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if (isLocal) {
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if (repoInfo.isLocal) {
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if (!input.getRev())
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input.attrs.insert_or_assign("rev",
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Hash::parseAny(chomp(runProgram("git", true, { "-C", actualUrl, "rev-parse", *input.getRef() })), htSHA1).gitRev());
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Hash::parseAny(chomp(runProgram("git", true, { "-C", repoInfo.url, "rev-parse", *input.getRef() })), htSHA1).gitRev());
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repoDir = actualUrl;
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repoDir = repoInfo.url;
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} else {
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@ -341,7 +380,7 @@ struct GitInputScheme : InputScheme
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}
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}
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Path cacheDir = getCacheDir() + "/nix/gitv3/" + hashString(htSHA256, actualUrl).to_string(Base32, false);
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Path cacheDir = getCacheDir() + "/nix/gitv3/" + hashString(htSHA256, repoInfo.url).to_string(Base32, false);
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repoDir = cacheDir;
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createDirs(dirOf(cacheDir));
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@ -373,7 +412,7 @@ struct GitInputScheme : InputScheme
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}
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}
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} else {
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if (allRefs) {
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if (repoInfo.allRefs) {
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doFetch = true;
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} else {
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/* If the local ref is older than ‘tarball-ttl’ seconds, do a
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@ -385,23 +424,23 @@ struct GitInputScheme : InputScheme
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}
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if (doFetch) {
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Activity act(*logger, lvlTalkative, actUnknown, fmt("fetching Git repository '%s'", actualUrl));
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Activity act(*logger, lvlTalkative, actUnknown, fmt("fetching Git repository '%s'", repoInfo.url));
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// FIXME: git stderr messes up our progress indicator, so
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// we're using --quiet for now. Should process its stderr.
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try {
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auto ref = input.getRef();
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auto fetchRef = allRefs
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auto fetchRef = repoInfo.allRefs
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? "refs/*"
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: ref->compare(0, 5, "refs/") == 0
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? *ref
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: ref == "HEAD"
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? *ref
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: "refs/heads/" + *ref;
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runProgram("git", true, { "-C", repoDir, "fetch", "--quiet", "--force", "--", actualUrl, fmt("%s:%s", fetchRef, fetchRef) });
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runProgram("git", true, { "-C", repoDir, "fetch", "--quiet", "--force", "--", repoInfo.url, fmt("%s:%s", fetchRef, fetchRef) });
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} catch (Error & e) {
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if (!pathExists(localRefFile)) throw;
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warn("could not update local clone of Git repository '%s'; continuing with the most recent version", actualUrl);
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warn("could not update local clone of Git repository '%s'; continuing with the most recent version", repoInfo.url);
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}
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struct timeval times[2];
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@ -421,12 +460,12 @@ struct GitInputScheme : InputScheme
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bool isShallow = chomp(runProgram("git", true, { "-C", repoDir, "rev-parse", "--is-shallow-repository" })) == "true";
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if (isShallow && !shallow)
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throw Error("'%s' is a shallow Git repository, but a non-shallow repository is needed", actualUrl);
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if (isShallow && !repoInfo.shallow)
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throw Error("'%s' is a shallow Git repository, but a non-shallow repository is needed", repoInfo.url);
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// FIXME: check whether rev is an ancestor of ref.
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printTalkative("using revision %s of repo '%s'", input.getRev()->gitRev(), actualUrl);
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printTalkative("using revision %s of repo '%s'", input.getRev()->gitRev(), repoInfo.url);
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/* Now that we know the ref, check again whether we have it in
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the store. */
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@ -452,11 +491,11 @@ struct GitInputScheme : InputScheme
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"allRefs = true;" ANSI_NORMAL " to " ANSI_BOLD "fetchGit" ANSI_NORMAL ".",
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input.getRev()->gitRev(),
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*input.getRef(),
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actualUrl
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repoInfo.url
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);
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}
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if (submodules) {
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if (repoInfo.submodules) {
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Path tmpGitDir = createTempDir();
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AutoDelete delTmpGitDir(tmpGitDir, true);
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@ -468,7 +507,7 @@ struct GitInputScheme : InputScheme
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"--update-head-ok", "--", repoDir, "refs/*:refs/*" });
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runProgram("git", true, { "-C", tmpDir, "checkout", "--quiet", input.getRev()->gitRev() });
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runProgram("git", true, { "-C", tmpDir, "remote", "add", "origin", actualUrl });
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runProgram("git", true, { "-C", tmpDir, "remote", "add", "origin", repoInfo.url });
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runProgram("git", true, { "-C", tmpDir, "submodule", "--quiet", "update", "--init", "--recursive" });
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filter = isNotDotGitDirectory;
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@ -495,7 +534,7 @@ struct GitInputScheme : InputScheme
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{"lastModified", lastModified},
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});
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if (!shallow)
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if (!repoInfo.shallow)
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infoAttrs.insert_or_assign("revCount",
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std::stoull(runProgram("git", true, { "-C", repoDir, "rev-list", "--count", input.getRev()->gitRev() })));
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@ -516,6 +555,23 @@ struct GitInputScheme : InputScheme
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return makeResult(infoAttrs, std::move(storePath));
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}
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std::pair<ref<InputAccessor>, Input> lazyFetch(ref<Store> store, const Input & input) override
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{
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auto repoInfo = getRepoInfo(input);
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/* Unless we're using the working tree, copy the tree into the
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Nix store. TODO: We could have an accessor for fetching
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files from the Git repository directly. */
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if (input.getRef() || input.getRev() || !repoInfo.isLocal)
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return InputScheme::lazyFetch(store, input);
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repoInfo.checkDirty();
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// FIXME: return updated input.
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|
||||
return {makeFSInputAccessor(repoInfo.url, listFiles(repoInfo)), input};
|
||||
}
|
||||
};
|
||||
|
||||
static auto rGitInputScheme = OnStartup([] { registerInputScheme(std::make_unique<GitInputScheme>()); });
|
||||
|
|
|
|||
Loading…
Reference in a new issue