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Fix build

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This commit is contained in:
Eelco Dolstra 2022-05-09 12:55:06 +02:00
parent 30ca717558
commit 0d3392bef1
1 changed files with 102 additions and 181 deletions
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283
src/libfetchers/git.cc
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@ -29,6 +29,7 @@ const std::string gitInitialBranch = "__nix_dummy_branch";
std::string getGitDir() std::string getGitDir()
{ {
// FIXME: respecting GIT_DIR globally seems wrong.
return getEnv("GIT_DIR").value_or(".git"); return getEnv("GIT_DIR").value_or(".git");
} }
@ -63,17 +64,14 @@ Path getCachePath(std::string_view key)
// ... // ...
std::optional<std::string> readHead(const Path & path) std::optional<std::string> readHead(const Path & path)
{ {
auto [exit_code, output] = runProgram(RunOptions { auto [status, output] = runProgram(RunOptions {
.program = "git", .program = "git",
// FIXME: use 'HEAD' // FIXME: use 'HEAD' to avoid returning all refs
.args = {"ls-remote", "--symref", path}, .args = {"ls-remote", "--symref", path},
}); });
if (exit_code != 0) { if (status != 0) return std::nullopt;
return std::nullopt;
}
std::string_view line = output; std::string_view line = output.substr(0, line.find("\n"));
line = line.substr(0, line.find("\n"));
if (const auto parseResult = git::parseLsRemoteLine(line)) { if (const auto parseResult = git::parseLsRemoteLine(line)) {
switch (parseResult->kind) { switch (parseResult->kind) {
case git::LsRemoteRefLine::Kind::Symbolic: case git::LsRemoteRefLine::Kind::Symbolic:
@ -89,7 +87,7 @@ std::optional<std::string> readHead(const Path & path)
} }
// Persist the HEAD ref from the remote repo in the local cached repo. // Persist the HEAD ref from the remote repo in the local cached repo.
bool storeCachedHead(std::string_view actualUrl, std::string headRef) bool storeCachedHead(const std::string & actualUrl, const std::string & headRef)
{ {
Path cacheDir = getCachePath(actualUrl); Path cacheDir = getCachePath(actualUrl);
try { try {
@ -102,7 +100,7 @@ bool storeCachedHead(std::string_view actualUrl, std::string headRef)
return true; return true;
} }
std::optional<std::string> readHeadCached(std::string_view actualUrl) std::optional<std::string> readHeadCached(const std::string & actualUrl)
{ {
// Create a cache path to store the branch of the HEAD ref. Append something // Create a cache path to store the branch of the HEAD ref. Append something
// in front of the URL to prevent collision with the repository itself. // in front of the URL to prevent collision with the repository itself.
@ -143,114 +141,6 @@ bool isNotDotGitDirectory(const Path & path)
return baseNameOf(path) != ".git"; return baseNameOf(path) != ".git";
} }
struct WorkdirInfo
{
bool clean = false;
bool hasHead = false;
};
// Returns whether a git workdir is clean and has commits.
WorkdirInfo getWorkdirInfo(const Input & input, const Path & workdir)
{
const bool submodules = maybeGetBoolAttr(input.attrs, "submodules").value_or(false);
auto gitDir = getGitDir();
auto env = getEnv();
// Set LC_ALL to C: because we rely on the error messages from git rev-parse to determine what went wrong
// that way unknown errors can lead to a failure instead of continuing through the wrong code path
env["LC_ALL"] = "C";
/* Check whether HEAD points to something that looks like a commit,
since that is the refrence we want to use later on. */
auto result = runProgram(RunOptions {
.program = "git",
.args = { "-C", workdir, "--git-dir", gitDir, "rev-parse", "--verify", "--no-revs", "HEAD^{commit}" },
.environment = env,
.mergeStderrToStdout = true
});
auto exitCode = WEXITSTATUS(result.first);
auto errorMessage = result.second;
if (errorMessage.find("fatal: not a git repository") != std::string::npos) {
throw Error("'%s' is not a Git repository", workdir);
} else if (errorMessage.find("fatal: Needed a single revision") != std::string::npos) {
// indicates that the repo does not have any commits
// we want to proceed and will consider it dirty later
} else if (exitCode != 0) {
// any other errors should lead to a failure
throw Error("getting the HEAD of the Git tree '%s' failed with exit code %d:\n%s", workdir, exitCode, errorMessage);
}
bool clean = false;
bool hasHead = exitCode == 0;
try {
if (hasHead) {
// Using git diff is preferrable over lower-level operations here,
// because its conceptually simpler and we only need the exit code anyways.
auto gitDiffOpts = Strings({ "-C", workdir, "diff", "HEAD", "--quiet"});
if (!submodules) {
// Changes in submodules should only make the tree dirty
// when those submodules will be copied as well.
gitDiffOpts.emplace_back("--ignore-submodules");
}
gitDiffOpts.emplace_back("--");
runProgram("git", true, gitDiffOpts);
clean = true;
}
} catch (ExecError & e) {
if (!WIFEXITED(e.status) || WEXITSTATUS(e.status) != 1) throw;
}
return WorkdirInfo { .clean = clean, .hasHead = hasHead };
}
std::pair<StorePath, Input> fetchFromWorkdir(ref<Store> store, Input & input, const Path & workdir, const WorkdirInfo & workdirInfo)
{
const bool submodules = maybeGetBoolAttr(input.attrs, "submodules").value_or(false);
if (!fetchSettings.allowDirty)
throw Error("Git tree '%s' is dirty", workdir);
if (fetchSettings.warnDirty)
warn("Git tree '%s' is dirty", workdir);
auto gitOpts = Strings({ "-C", workdir, "ls-files", "-z" });
if (submodules)
gitOpts.emplace_back("--recurse-submodules");
auto files = tokenizeString<std::set<std::string>>(
runProgram("git", true, gitOpts), "\0"s);
Path actualPath(absPath(workdir));
PathFilter filter = [&](const Path & p) -> bool {
assert(hasPrefix(p, actualPath));
std::string file(p, actualPath.size() + 1);
auto st = lstat(p);
if (S_ISDIR(st.st_mode)) {
auto prefix = file + "/";
auto i = files.lower_bound(prefix);
return i != files.end() && hasPrefix(*i, prefix);
}
return files.count(file);
};
auto storePath = store->addToStore(input.getName(), actualPath, FileIngestionMethod::Recursive, htSHA256, filter);
// FIXME: maybe we should use the timestamp of the last
// modified dirty file?
input.attrs.insert_or_assign(
"lastModified",
workdirInfo.hasHead ? std::stoull(runProgram("git", true, { "-C", actualPath, "log", "-1", "--format=%ct", "--no-show-signature", "HEAD" })) : 0);
return {std::move(storePath), input};
}
} // end namespace } // end namespace
struct GitInputScheme : InputScheme struct GitInputScheme : InputScheme
@ -402,7 +292,7 @@ struct GitInputScheme : InputScheme
/* URL of the repo, or its path if isLocal. */ /* URL of the repo, or its path if isLocal. */
std::string url; std::string url;
void checkDirty() void checkDirty() const
{ {
if (isDirty) { if (isDirty) {
if (!fetchSettings.allowDirty) if (!fetchSettings.allowDirty)
@ -416,11 +306,20 @@ struct GitInputScheme : InputScheme
RepoInfo getRepoInfo(const Input & input) RepoInfo getRepoInfo(const Input & input)
{ {
RepoInfo repoInfo; auto checkHashType = [&](const std::optional<Hash> & hash)
{
if (hash.has_value() && !(hash->type == htSHA1 || hash->type == htSHA256))
throw Error("Hash '%s' is not supported by Git. Supported types are sha1 and sha256.", hash->to_string(Base16, true));
};
repoInfo.shallow = maybeGetBoolAttr(input.attrs, "shallow").value_or(false); if (auto rev = input.getRev())
repoInfo.submodules = maybeGetBoolAttr(input.attrs, "submodules").value_or(false); checkHashType(rev);
repoInfo.allRefs = maybeGetBoolAttr(input.attrs, "allRefs").value_or(false);
RepoInfo repoInfo {
.shallow = maybeGetBoolAttr(input.attrs, "shallow").value_or(false),
.submodules = maybeGetBoolAttr(input.attrs, "submodules").value_or(false),
.allRefs = maybeGetBoolAttr(input.attrs, "allRefs").value_or(false)
};
repoInfo.cacheType = "git"; repoInfo.cacheType = "git";
if (repoInfo.shallow) repoInfo.cacheType += "-shallow"; if (repoInfo.shallow) repoInfo.cacheType += "-shallow";
@ -454,7 +353,7 @@ struct GitInputScheme : InputScheme
on. */ on. */
auto result = runProgram(RunOptions { auto result = runProgram(RunOptions {
.program = "git", .program = "git",
.args = { "-C", repoInfo.url, "--git-dir=.git", "rev-parse", "--verify", "--no-revs", "HEAD^{commit}" }, .args = { "-C", repoInfo.url, "--git-dir", getGitDir(), "rev-parse", "--verify", "--no-revs", "HEAD^{commit}" },
.environment = env, .environment = env,
.mergeStderrToStdout = true .mergeStderrToStdout = true
}); });
@ -506,9 +405,22 @@ struct GitInputScheme : InputScheme
runProgram("git", true, gitOpts), "\0"s); runProgram("git", true, gitOpts), "\0"s);
} }
std::string getDefaultRef(const RepoInfo & repoInfo)
{
auto head = repoInfo.isLocal
? readHead(repoInfo.url)
: readHeadCached(repoInfo.url);
if (!head) {
warn("could not read HEAD ref from repo at '%s', using 'master'", repoInfo.url);
return "master";
}
return *head;
}
std::pair<StorePath, Input> fetch(ref<Store> store, const Input & _input) override std::pair<StorePath, Input> fetch(ref<Store> store, const Input & _input) override
{ {
Input input(_input); Input input(_input);
auto gitDir = getGitDir(); // FIXME: move into RepoInfo
auto repoInfo = getRepoInfo(input); auto repoInfo = getRepoInfo(input);
@ -539,46 +451,18 @@ struct GitInputScheme : InputScheme
return makeResult(res->first, std::move(res->second)); return makeResult(res->first, std::move(res->second));
} }
if (repoInfo.isDirty) { if (repoInfo.isDirty)
/* This is an unclean working tree. So copy all tracked files. */ return fetchFromWorkdir(store, repoInfo, std::move(input));
repoInfo.checkDirty();
auto files = listFiles(repoInfo); auto originalRef = input.getRef();
auto ref = originalRef ? *originalRef : getDefaultRef(repoInfo);
PathFilter filter = [&](const Path & p) -> bool { input.attrs.insert_or_assign("ref", ref);
assert(hasPrefix(p, repoInfo.url));
std::string file(p, repoInfo.url.size() + 1);
auto st = lstat(p);
if (S_ISDIR(st.st_mode)) {
auto prefix = file + "/";
auto i = files.lower_bound(prefix);
return i != files.end() && hasPrefix(*i, prefix);
}
return files.count(file);
};
auto storePath = store->addToStore(input.getName(), repoInfo.url, FileIngestionMethod::Recursive, htSHA256, filter);
// FIXME: maybe we should use the timestamp of the last
// modified dirty file?
input.attrs.insert_or_assign(
"lastModified",
repoInfo.hasHead ? std::stoull(runProgram("git", true, { "-C", repoInfo.url, "log", "-1", "--format=%ct", "--no-show-signature", "HEAD" })) : 0);
return {std::move(storePath), input};
}
// FIXME: move to getRepoInfo().
if (!input.getRef()) input.attrs.insert_or_assign("ref", repoInfo.isLocal ? readHead(repoInfo.url) : "master");
Attrs unlockedAttrs({ Attrs unlockedAttrs({
{"type", repoInfo.cacheType}, {"type", repoInfo.cacheType},
{"name", name}, {"name", name},
{"url", repoInfo.url}, {"url", repoInfo.url},
{"ref", *input.getRef()}, {"ref", ref},
}); });
Path repoDir; Path repoDir;
@ -587,21 +471,11 @@ struct GitInputScheme : InputScheme
if (!input.getRev()) if (!input.getRev())
input.attrs.insert_or_assign("rev", input.attrs.insert_or_assign("rev",
Hash::parseAny(chomp(runProgram("git", true, { "-C", repoInfo.url, "rev-parse", *input.getRef() })), htSHA1).gitRev()); Hash::parseAny(chomp(runProgram("git", true, { "-C", repoInfo.url, "--git-dir", getGitDir(), "rev-parse", ref })), htSHA1).gitRev());
repoDir = repoInfo.url; repoDir = repoInfo.url;
} else { } else {
const bool useHeadRef = !input.getRef();
if (useHeadRef) {
auto head = readHeadCached(actualUrl);
if (!head) {
warn("could not read HEAD ref from repo at '%s', using 'master'", actualUrl);
head = "master";
}
input.attrs.insert_or_assign("ref", *head);
}
if (auto res = getCache()->lookup(store, unlockedAttrs)) { if (auto res = getCache()->lookup(store, unlockedAttrs)) {
auto rev2 = Hash::parseAny(getStrAttr(res->first, "rev"), htSHA1); auto rev2 = Hash::parseAny(getStrAttr(res->first, "rev"), htSHA1);
if (!input.getRev() || input.getRev() == rev2) { if (!input.getRev() || input.getRev() == rev2) {
@ -610,7 +484,7 @@ struct GitInputScheme : InputScheme
} }
} }
Path cacheDir = getCacheDir() + "/nix/gitv3/" + hashString(htSHA256, repoInfo.url).to_string(Base32, false); Path cacheDir = getCachePath(repoInfo.url);
repoDir = cacheDir; repoDir = cacheDir;
gitDir = "."; gitDir = ".";
@ -622,9 +496,9 @@ struct GitInputScheme : InputScheme
} }
Path localRefFile = Path localRefFile =
input.getRef()->compare(0, 5, "refs/") == 0 ref.compare(0, 5, "refs/") == 0
? cacheDir + "/" + *input.getRef() ? cacheDir + "/" + ref
: cacheDir + "/refs/heads/" + *input.getRef(); : cacheDir + "/refs/heads/" + ref;
bool doFetch; bool doFetch;
time_t now = time(0); time_t now = time(0);
@ -660,15 +534,23 @@ struct GitInputScheme : InputScheme
// FIXME: git stderr messes up our progress indicator, so // FIXME: git stderr messes up our progress indicator, so
// we're using --quiet for now. Should process its stderr. // we're using --quiet for now. Should process its stderr.
try { try {
auto ref = input.getRef();
auto fetchRef = repoInfo.allRefs auto fetchRef = repoInfo.allRefs
? "refs/*" ? "refs/*"
: ref->compare(0, 5, "refs/") == 0 : ref.compare(0, 5, "refs/") == 0
? *ref ? ref
: ref == "HEAD" : ref == "HEAD"
? *ref ? ref
: "refs/heads/" + *ref; : "refs/heads/" + ref;
runProgram("git", true, { "-C", repoDir, "fetch", "--quiet", "--force", "--", repoInfo.url, fmt("%s:%s", fetchRef, fetchRef) }); runProgram("git", true,
{ "-C", repoDir,
"fetch",
"--git-dir", getGitDir(),
"--quiet",
"--force",
"--",
repoInfo.url,
fmt("%s:%s", fetchRef, fetchRef)
});
} catch (Error & e) { } catch (Error & e) {
if (!pathExists(localRefFile)) throw; if (!pathExists(localRefFile)) throw;
warn("could not update local clone of Git repository '%s'; continuing with the most recent version", repoInfo.url); warn("could not update local clone of Git repository '%s'; continuing with the most recent version", repoInfo.url);
@ -676,8 +558,8 @@ struct GitInputScheme : InputScheme
if (!touchCacheFile(localRefFile, now)) if (!touchCacheFile(localRefFile, now))
warn("could not update mtime for file '%s': %s", localRefFile, strerror(errno)); warn("could not update mtime for file '%s': %s", localRefFile, strerror(errno));
if (useHeadRef && !storeCachedHead(actualUrl, *input.getRef())) if (!originalRef && !storeCachedHead(repoInfo.url, ref))
warn("could not update cached head '%s' for '%s'", *input.getRef(), actualUrl); warn("could not update cached head '%s' for '%s'", ref, repoInfo.url);
} }
if (!input.getRev()) if (!input.getRev())
@ -718,7 +600,7 @@ struct GitInputScheme : InputScheme
ANSI_BOLD "ref" ANSI_NORMAL " you've specified or add " ANSI_BOLD ANSI_BOLD "ref" ANSI_NORMAL " you've specified or add " ANSI_BOLD
"allRefs = true;" ANSI_NORMAL " to " ANSI_BOLD "fetchGit" ANSI_NORMAL ".", "allRefs = true;" ANSI_NORMAL " to " ANSI_BOLD "fetchGit" ANSI_NORMAL ".",
input.getRev()->gitRev(), input.getRev()->gitRev(),
*input.getRef(), ref,
repoInfo.url repoInfo.url
); );
} }
@ -784,6 +666,45 @@ struct GitInputScheme : InputScheme
return makeResult(infoAttrs, std::move(storePath)); return makeResult(infoAttrs, std::move(storePath));
} }
std::pair<StorePath, Input> fetchFromWorkdir(
ref<Store> store,
const RepoInfo & repoInfo,
Input input)
{
/* This is an unclean working tree. So copy all tracked
files. */
repoInfo.checkDirty();
auto files = listFiles(repoInfo);
PathFilter filter = [&](const Path & p) -> bool {
assert(hasPrefix(p, repoInfo.url));
std::string file(p, repoInfo.url.size() + 1);
auto st = lstat(p);
if (S_ISDIR(st.st_mode)) {
auto prefix = file + "/";
auto i = files.lower_bound(prefix);
return i != files.end() && hasPrefix(*i, prefix);
}
return files.count(file);
};
auto storePath = store->addToStore(input.getName(), repoInfo.url, FileIngestionMethod::Recursive, htSHA256, filter);
// FIXME: maybe we should use the timestamp of the last
// modified dirty file?
input.attrs.insert_or_assign(
"lastModified",
repoInfo.hasHead
? std::stoull(runProgram("git", true, { "-C", repoInfo.url, "log", "-1", "--format=%ct", "--no-show-signature", "HEAD" }))
: 0);
return {std::move(storePath), input};
}
std::pair<ref<InputAccessor>, Input> lazyFetch(ref<Store> store, const Input & input) override std::pair<ref<InputAccessor>, Input> lazyFetch(ref<Store> store, const Input & input) override
{ {
auto repoInfo = getRepoInfo(input); auto repoInfo = getRepoInfo(input);