mirror of
https://github.com/NixOS/nix
synced 2024-09-22 11:50:24 -04:00
439 lines
15 KiB
C++
439 lines
15 KiB
C++
#include "fetchers.hh"
|
||
#include "cache.hh"
|
||
#include "globals.hh"
|
||
#include "tarfile.hh"
|
||
#include "store-api.hh"
|
||
|
||
#include <sys/time.h>
|
||
|
||
using namespace std::string_literals;
|
||
|
||
namespace nix::fetchers {
|
||
|
||
static std::string readHead(const Path & path)
|
||
{
|
||
return chomp(runProgram("git", true, { "-C", path, "rev-parse", "--abbrev-ref", "HEAD" }));
|
||
}
|
||
|
||
static bool isNotDotGitDirectory(const Path & path)
|
||
{
|
||
static const std::regex gitDirRegex("^(?:.*/)?\\.git$");
|
||
|
||
return not std::regex_match(path, gitDirRegex);
|
||
}
|
||
|
||
struct GitInput : Input
|
||
{
|
||
ParsedURL url;
|
||
std::optional<std::string> ref;
|
||
std::optional<Hash> rev;
|
||
bool shallow = false;
|
||
bool submodules = false;
|
||
|
||
GitInput(const ParsedURL & url) : url(url)
|
||
{ }
|
||
|
||
std::string type() const override { return "git"; }
|
||
|
||
bool operator ==(const Input & other) const override
|
||
{
|
||
auto other2 = dynamic_cast<const GitInput *>(&other);
|
||
return
|
||
other2
|
||
&& url == other2->url
|
||
&& rev == other2->rev
|
||
&& ref == other2->ref;
|
||
}
|
||
|
||
bool isImmutable() const override
|
||
{
|
||
return (bool) rev || narHash;
|
||
}
|
||
|
||
std::optional<std::string> getRef() const override { return ref; }
|
||
|
||
std::optional<Hash> getRev() const override { return rev; }
|
||
|
||
ParsedURL toURL() const override
|
||
{
|
||
ParsedURL url2(url);
|
||
if (url2.scheme != "git") url2.scheme = "git+" + url2.scheme;
|
||
if (rev) url2.query.insert_or_assign("rev", rev->gitRev());
|
||
if (ref) url2.query.insert_or_assign("ref", *ref);
|
||
if (shallow) url2.query.insert_or_assign("shallow", "1");
|
||
return url2;
|
||
}
|
||
|
||
Attrs toAttrsInternal() const override
|
||
{
|
||
Attrs attrs;
|
||
attrs.emplace("url", url.to_string());
|
||
if (ref)
|
||
attrs.emplace("ref", *ref);
|
||
if (rev)
|
||
attrs.emplace("rev", rev->gitRev());
|
||
if (shallow)
|
||
attrs.emplace("shallow", true);
|
||
if (submodules)
|
||
attrs.emplace("submodules", true);
|
||
return attrs;
|
||
}
|
||
|
||
std::pair<bool, std::string> getActualUrl() const
|
||
{
|
||
// Don't clone file:// URIs (but otherwise treat them the
|
||
// same as remote URIs, i.e. don't use the working tree or
|
||
// HEAD).
|
||
static bool forceHttp = getEnv("_NIX_FORCE_HTTP") == "1"; // for testing
|
||
bool isLocal = url.scheme == "file" && !forceHttp;
|
||
return {isLocal, isLocal ? url.path : url.base};
|
||
}
|
||
|
||
std::pair<Tree, std::shared_ptr<const Input>> fetchTreeInternal(nix::ref<Store> store) const override
|
||
{
|
||
auto name = "source";
|
||
|
||
auto input = std::make_shared<GitInput>(*this);
|
||
|
||
assert(!rev || rev->type == htSHA1);
|
||
|
||
std::string cacheType = "git";
|
||
if (shallow) cacheType += "-shallow";
|
||
if (submodules) cacheType += "-submodules";
|
||
|
||
auto getImmutableAttrs = [&]()
|
||
{
|
||
return Attrs({
|
||
{"type", cacheType},
|
||
{"name", name},
|
||
{"rev", input->rev->gitRev()},
|
||
});
|
||
};
|
||
|
||
auto makeResult = [&](const Attrs & infoAttrs, StorePath && storePath)
|
||
-> std::pair<Tree, std::shared_ptr<const Input>>
|
||
{
|
||
assert(input->rev);
|
||
assert(!rev || rev == input->rev);
|
||
return {
|
||
Tree {
|
||
.actualPath = store->toRealPath(storePath),
|
||
.storePath = std::move(storePath),
|
||
.info = TreeInfo {
|
||
.revCount = shallow ? std::nullopt : std::optional(getIntAttr(infoAttrs, "revCount")),
|
||
.lastModified = getIntAttr(infoAttrs, "lastModified"),
|
||
},
|
||
},
|
||
input
|
||
};
|
||
};
|
||
|
||
if (rev) {
|
||
if (auto res = getCache()->lookup(store, getImmutableAttrs()))
|
||
return makeResult(res->first, std::move(res->second));
|
||
}
|
||
|
||
auto [isLocal, actualUrl_] = getActualUrl();
|
||
auto actualUrl = actualUrl_; // work around clang bug
|
||
|
||
// If this is a local directory and no ref or revision is
|
||
// given, then allow the use of an unclean working tree.
|
||
if (!input->ref && !input->rev && isLocal) {
|
||
bool clean = false;
|
||
|
||
/* Check whether this repo has any commits. There are
|
||
probably better ways to do this. */
|
||
auto gitDir = actualUrl + "/.git";
|
||
auto commonGitDir = chomp(runProgram(
|
||
"git",
|
||
true,
|
||
{ "-C", actualUrl, "rev-parse", "--git-common-dir" }
|
||
));
|
||
if (commonGitDir != ".git")
|
||
gitDir = commonGitDir;
|
||
|
||
bool haveCommits = !readDirectory(gitDir + "/refs/heads").empty();
|
||
|
||
try {
|
||
if (haveCommits) {
|
||
runProgram("git", true, { "-C", actualUrl, "diff-index", "--quiet", "HEAD", "--" });
|
||
clean = true;
|
||
}
|
||
} catch (ExecError & e) {
|
||
if (!WIFEXITED(e.status) || WEXITSTATUS(e.status) != 1) throw;
|
||
}
|
||
|
||
if (!clean) {
|
||
|
||
/* This is an unclean working tree. So copy all tracked files. */
|
||
|
||
if (!settings.allowDirty)
|
||
throw Error("Git tree '%s' is dirty", actualUrl);
|
||
|
||
if (settings.warnDirty)
|
||
warn("Git tree '%s' is dirty", actualUrl);
|
||
|
||
auto gitOpts = Strings({ "-C", actualUrl, "ls-files", "-z" });
|
||
if (submodules)
|
||
gitOpts.emplace_back("--recurse-submodules");
|
||
|
||
auto files = tokenizeString<std::set<std::string>>(
|
||
runProgram("git", true, gitOpts), "\0"s);
|
||
|
||
PathFilter filter = [&](const Path & p) -> bool {
|
||
assert(hasPrefix(p, actualUrl));
|
||
std::string file(p, actualUrl.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("source", actualUrl, true, htSHA256, filter);
|
||
|
||
auto tree = Tree {
|
||
.actualPath = store->printStorePath(storePath),
|
||
.storePath = std::move(storePath),
|
||
.info = TreeInfo {
|
||
// FIXME: maybe we should use the timestamp of the last
|
||
// modified dirty file?
|
||
.lastModified = haveCommits ? std::stoull(runProgram("git", true, { "-C", actualUrl, "log", "-1", "--format=%ct", "HEAD" })) : 0,
|
||
}
|
||
};
|
||
|
||
return {std::move(tree), input};
|
||
}
|
||
}
|
||
|
||
if (!input->ref) input->ref = isLocal ? readHead(actualUrl) : "master";
|
||
|
||
Attrs mutableAttrs({
|
||
{"type", cacheType},
|
||
{"name", name},
|
||
{"url", actualUrl},
|
||
{"ref", *input->ref},
|
||
});
|
||
|
||
Path repoDir;
|
||
|
||
if (isLocal) {
|
||
|
||
if (!input->rev)
|
||
input->rev = Hash(chomp(runProgram("git", true, { "-C", actualUrl, "rev-parse", *input->ref })), htSHA1);
|
||
|
||
repoDir = actualUrl;
|
||
|
||
} else {
|
||
|
||
if (auto res = getCache()->lookup(store, mutableAttrs)) {
|
||
auto rev2 = Hash(getStrAttr(res->first, "rev"), htSHA1);
|
||
if (!rev || rev == rev2) {
|
||
input->rev = rev2;
|
||
return makeResult(res->first, std::move(res->second));
|
||
}
|
||
}
|
||
|
||
Path cacheDir = getCacheDir() + "/nix/gitv3/" + hashString(htSHA256, actualUrl).to_string(Base32, false);
|
||
repoDir = cacheDir;
|
||
|
||
if (!pathExists(cacheDir)) {
|
||
createDirs(dirOf(cacheDir));
|
||
runProgram("git", true, { "init", "--bare", repoDir });
|
||
}
|
||
|
||
Path localRefFile =
|
||
input->ref->compare(0, 5, "refs/") == 0
|
||
? cacheDir + "/" + *input->ref
|
||
: cacheDir + "/refs/heads/" + *input->ref;
|
||
|
||
bool doFetch;
|
||
time_t now = time(0);
|
||
|
||
/* If a rev was specified, we need to fetch if it's not in the
|
||
repo. */
|
||
if (input->rev) {
|
||
try {
|
||
runProgram("git", true, { "-C", repoDir, "cat-file", "-e", input->rev->gitRev() });
|
||
doFetch = false;
|
||
} catch (ExecError & e) {
|
||
if (WIFEXITED(e.status)) {
|
||
doFetch = true;
|
||
} else {
|
||
throw;
|
||
}
|
||
}
|
||
} else {
|
||
/* If the local ref is older than ‘tarball-ttl’ seconds, do a
|
||
git fetch to update the local ref to the remote ref. */
|
||
struct stat st;
|
||
doFetch = stat(localRefFile.c_str(), &st) != 0 ||
|
||
(uint64_t) st.st_mtime + settings.tarballTtl <= (uint64_t) now;
|
||
}
|
||
|
||
if (doFetch) {
|
||
Activity act(*logger, lvlTalkative, actUnknown, fmt("fetching Git repository '%s'", actualUrl));
|
||
|
||
// FIXME: git stderr messes up our progress indicator, so
|
||
// we're using --quiet for now. Should process its stderr.
|
||
try {
|
||
runProgram("git", true, { "-C", repoDir, "fetch", "--quiet", "--force", "--", actualUrl, fmt("%s:%s", *input->ref, *input->ref) });
|
||
} catch (Error & e) {
|
||
if (!pathExists(localRefFile)) throw;
|
||
warn("could not update local clone of Git repository '%s'; continuing with the most recent version", actualUrl);
|
||
}
|
||
|
||
struct timeval times[2];
|
||
times[0].tv_sec = now;
|
||
times[0].tv_usec = 0;
|
||
times[1].tv_sec = now;
|
||
times[1].tv_usec = 0;
|
||
|
||
utimes(localRefFile.c_str(), times);
|
||
}
|
||
|
||
if (!input->rev)
|
||
input->rev = Hash(chomp(readFile(localRefFile)), htSHA1);
|
||
}
|
||
|
||
bool isShallow = chomp(runProgram("git", true, { "-C", repoDir, "rev-parse", "--is-shallow-repository" })) == "true";
|
||
|
||
if (isShallow && !shallow)
|
||
throw Error("'%s' is a shallow Git repository, but a non-shallow repository is needed", actualUrl);
|
||
|
||
// FIXME: check whether rev is an ancestor of ref.
|
||
|
||
printTalkative("using revision %s of repo '%s'", input->rev->gitRev(), actualUrl);
|
||
|
||
/* Now that we know the ref, check again whether we have it in
|
||
the store. */
|
||
if (auto res = getCache()->lookup(store, getImmutableAttrs()))
|
||
return makeResult(res->first, std::move(res->second));
|
||
|
||
Path tmpDir = createTempDir();
|
||
AutoDelete delTmpDir(tmpDir, true);
|
||
PathFilter filter = defaultPathFilter;
|
||
|
||
if (submodules) {
|
||
Path tmpGitDir = createTempDir();
|
||
AutoDelete delTmpGitDir(tmpGitDir, true);
|
||
|
||
runProgram("git", true, { "init", tmpDir, "--separate-git-dir", tmpGitDir });
|
||
// TODO: repoDir might lack the ref (it only checks if rev
|
||
// exists, see FIXME above) so use a big hammer and fetch
|
||
// everything to ensure we get the rev.
|
||
runProgram("git", true, { "-C", tmpDir, "fetch", "--quiet", "--force",
|
||
"--update-head-ok", "--", repoDir, "refs/*:refs/*" });
|
||
|
||
runProgram("git", true, { "-C", tmpDir, "checkout", "--quiet", input->rev->gitRev() });
|
||
runProgram("git", true, { "-C", tmpDir, "remote", "add", "origin", actualUrl });
|
||
runProgram("git", true, { "-C", tmpDir, "submodule", "--quiet", "update", "--init", "--recursive" });
|
||
|
||
filter = isNotDotGitDirectory;
|
||
} else {
|
||
// FIXME: should pipe this, or find some better way to extract a
|
||
// revision.
|
||
auto source = sinkToSource([&](Sink & sink) {
|
||
RunOptions gitOptions("git", { "-C", repoDir, "archive", input->rev->gitRev() });
|
||
gitOptions.standardOut = &sink;
|
||
runProgram2(gitOptions);
|
||
});
|
||
|
||
unpackTarfile(*source, tmpDir);
|
||
}
|
||
|
||
auto storePath = store->addToStore(name, tmpDir, true, htSHA256, filter);
|
||
|
||
auto lastModified = std::stoull(runProgram("git", true, { "-C", repoDir, "log", "-1", "--format=%ct", input->rev->gitRev() }));
|
||
|
||
Attrs infoAttrs({
|
||
{"rev", input->rev->gitRev()},
|
||
{"lastModified", lastModified},
|
||
});
|
||
|
||
if (!shallow)
|
||
infoAttrs.insert_or_assign("revCount",
|
||
std::stoull(runProgram("git", true, { "-C", repoDir, "rev-list", "--count", input->rev->gitRev() })));
|
||
|
||
if (!this->rev)
|
||
getCache()->add(
|
||
store,
|
||
mutableAttrs,
|
||
infoAttrs,
|
||
storePath,
|
||
false);
|
||
|
||
getCache()->add(
|
||
store,
|
||
getImmutableAttrs(),
|
||
infoAttrs,
|
||
storePath,
|
||
true);
|
||
|
||
return makeResult(infoAttrs, std::move(storePath));
|
||
}
|
||
};
|
||
|
||
struct GitInputScheme : InputScheme
|
||
{
|
||
std::unique_ptr<Input> inputFromURL(const ParsedURL & url) override
|
||
{
|
||
if (url.scheme != "git" &&
|
||
url.scheme != "git+http" &&
|
||
url.scheme != "git+https" &&
|
||
url.scheme != "git+ssh" &&
|
||
url.scheme != "git+file") return nullptr;
|
||
|
||
auto url2(url);
|
||
if (hasPrefix(url2.scheme, "git+")) url2.scheme = std::string(url2.scheme, 4);
|
||
url2.query.clear();
|
||
|
||
Attrs attrs;
|
||
attrs.emplace("type", "git");
|
||
|
||
for (auto &[name, value] : url.query) {
|
||
if (name == "rev" || name == "ref")
|
||
attrs.emplace(name, value);
|
||
else
|
||
url2.query.emplace(name, value);
|
||
}
|
||
|
||
attrs.emplace("url", url2.to_string());
|
||
|
||
return inputFromAttrs(attrs);
|
||
}
|
||
|
||
std::unique_ptr<Input> inputFromAttrs(const Attrs & attrs) override
|
||
{
|
||
if (maybeGetStrAttr(attrs, "type") != "git") return {};
|
||
|
||
for (auto & [name, value] : attrs)
|
||
if (name != "type" && name != "url" && name != "ref" && name != "rev" && name != "shallow" && name != "submodules")
|
||
throw Error("unsupported Git input attribute '%s'", name);
|
||
|
||
auto input = std::make_unique<GitInput>(parseURL(getStrAttr(attrs, "url")));
|
||
if (auto ref = maybeGetStrAttr(attrs, "ref")) {
|
||
if (!std::regex_match(*ref, refRegex))
|
||
throw BadURL("invalid Git branch/tag name '%s'", *ref);
|
||
input->ref = *ref;
|
||
}
|
||
if (auto rev = maybeGetStrAttr(attrs, "rev"))
|
||
input->rev = Hash(*rev, htSHA1);
|
||
|
||
input->shallow = maybeGetBoolAttr(attrs, "shallow").value_or(false);
|
||
|
||
input->submodules = maybeGetBoolAttr(attrs, "submodules").value_or(false);
|
||
|
||
return input;
|
||
}
|
||
};
|
||
|
||
static auto r1 = OnStartup([] { registerInputScheme(std::make_unique<GitInputScheme>()); });
|
||
|
||
}
|