forked from lix-project/lix
248 lines
7.7 KiB
C++
248 lines
7.7 KiB
C++
#include "primops.hh"
|
||
#include "eval-inline.hh"
|
||
#include "download.hh"
|
||
#include "store-api.hh"
|
||
#include "pathlocks.hh"
|
||
#include "hash.hh"
|
||
|
||
#include <sys/time.h>
|
||
|
||
#include <regex>
|
||
|
||
#include <nlohmann/json.hpp>
|
||
|
||
using namespace std::string_literals;
|
||
|
||
namespace nix {
|
||
|
||
struct GitInfo
|
||
{
|
||
Path storePath;
|
||
std::string rev;
|
||
std::string shortRev;
|
||
uint64_t revCount = 0;
|
||
};
|
||
|
||
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)
|
||
{
|
||
if (evalSettings.pureEval && rev == "")
|
||
throw Error("in pure evaluation mode, 'fetchGit' requires a Git revision");
|
||
|
||
if (!ref && rev == "" && hasPrefix(uri, "/") && pathExists(uri + "/.git")) {
|
||
|
||
bool clean = true;
|
||
|
||
try {
|
||
runProgram("git", true, { "-C", uri, "diff-index", "--quiet", "HEAD", "--" });
|
||
} catch (ExecError & e) {
|
||
if (!WIFEXITED(e.status) || WEXITSTATUS(e.status) != 1) throw;
|
||
clean = false;
|
||
}
|
||
|
||
if (!clean) {
|
||
|
||
/* This is an unclean working tree. So copy all tracked
|
||
files. */
|
||
|
||
GitInfo gitInfo;
|
||
gitInfo.rev = "0000000000000000000000000000000000000000";
|
||
gitInfo.shortRev = std::string(gitInfo.rev, 0, 7);
|
||
|
||
auto files = tokenizeString<std::set<std::string>>(
|
||
runProgram("git", true, { "-C", uri, "ls-files", "-z" }), "\0"s);
|
||
|
||
PathFilter filter = [&](const Path & p) -> bool {
|
||
assert(hasPrefix(p, uri));
|
||
std::string file(p, uri.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);
|
||
};
|
||
|
||
gitInfo.storePath = store->addToStore("source", uri, true, htSHA256, filter);
|
||
|
||
return gitInfo;
|
||
}
|
||
|
||
// clean working tree, but no ref or rev specified. Use 'HEAD'.
|
||
rev = chomp(runProgram("git", true, { "-C", uri, "rev-parse", "HEAD" }));
|
||
ref = "HEAD"s;
|
||
}
|
||
|
||
if (!ref) ref = "HEAD"s;
|
||
|
||
if (rev != "" && !std::regex_match(rev, revRegex))
|
||
throw Error("invalid Git revision '%s'", rev);
|
||
|
||
deletePath(getCacheDir() + "/nix/git");
|
||
|
||
Path cacheDir = getCacheDir() + "/nix/gitv2/" + hashString(htSHA256, uri).to_string(Base32, false);
|
||
|
||
if (!pathExists(cacheDir)) {
|
||
createDirs(dirOf(cacheDir));
|
||
runProgram("git", true, { "init", "--bare", cacheDir });
|
||
}
|
||
|
||
Path localRefFile;
|
||
if (ref->compare(0, 5, "refs/") == 0)
|
||
localRefFile = cacheDir + "/" + *ref;
|
||
else
|
||
localRefFile = cacheDir + "/refs/heads/" + *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 (rev != "") {
|
||
try {
|
||
runProgram("git", true, { "-C", cacheDir, "cat-file", "-e", rev });
|
||
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'", uri));
|
||
|
||
// FIXME: git stderr messes up our progress indicator, so
|
||
// we're using --quiet for now. Should process its stderr.
|
||
runProgram("git", true, { "-C", cacheDir, "fetch", "--quiet", "--force", "--", uri, fmt("%s:%s", *ref, *ref) });
|
||
|
||
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);
|
||
}
|
||
|
||
// FIXME: check whether rev is an ancestor of ref.
|
||
GitInfo gitInfo;
|
||
gitInfo.rev = rev != "" ? rev : chomp(readFile(localRefFile));
|
||
gitInfo.shortRev = std::string(gitInfo.rev, 0, 7);
|
||
|
||
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);
|
||
Path storeLink = cacheDir + "/" + storeLinkName + ".link";
|
||
PathLocks storeLinkLock({storeLink}, fmt("waiting for lock on '%1%'...", storeLink)); // FIXME: broken
|
||
|
||
try {
|
||
auto json = nlohmann::json::parse(readFile(storeLink));
|
||
|
||
assert(json["name"] == name && json["rev"] == gitInfo.rev);
|
||
|
||
gitInfo.storePath = json["storePath"];
|
||
|
||
if (store->isValidPath(gitInfo.storePath)) {
|
||
gitInfo.revCount = json["revCount"];
|
||
return gitInfo;
|
||
}
|
||
|
||
} catch (SysError & e) {
|
||
if (e.errNo != ENOENT) throw;
|
||
}
|
||
|
||
// FIXME: should pipe this, or find some better way to extract a
|
||
// revision.
|
||
auto tar = runProgram("git", true, { "-C", cacheDir, "archive", gitInfo.rev });
|
||
|
||
Path tmpDir = createTempDir();
|
||
AutoDelete delTmpDir(tmpDir, true);
|
||
|
||
runProgram("tar", true, { "x", "-C", tmpDir }, tar);
|
||
|
||
gitInfo.storePath = store->addToStore(name, tmpDir);
|
||
|
||
gitInfo.revCount = std::stoull(runProgram("git", true, { "-C", cacheDir, "rev-list", "--count", gitInfo.rev }));
|
||
|
||
nlohmann::json json;
|
||
json["storePath"] = gitInfo.storePath;
|
||
json["uri"] = uri;
|
||
json["name"] = name;
|
||
json["rev"] = gitInfo.rev;
|
||
json["revCount"] = gitInfo.revCount;
|
||
|
||
writeFile(storeLink, json.dump());
|
||
|
||
return gitInfo;
|
||
}
|
||
|
||
static void prim_fetchGit(EvalState & state, const Pos & pos, Value * * args, Value & v)
|
||
{
|
||
std::string url;
|
||
std::optional<std::string> ref;
|
||
std::string rev;
|
||
std::string name = "source";
|
||
PathSet context;
|
||
|
||
state.forceValue(*args[0]);
|
||
|
||
if (args[0]->type == tAttrs) {
|
||
|
||
state.forceAttrs(*args[0], pos);
|
||
|
||
for (auto & attr : *args[0]->attrs) {
|
||
string n(attr.name);
|
||
if (n == "url")
|
||
url = state.coerceToString(*attr.pos, *attr.value, context, false, false);
|
||
else if (n == "ref")
|
||
ref = state.forceStringNoCtx(*attr.value, *attr.pos);
|
||
else if (n == "rev")
|
||
rev = state.forceStringNoCtx(*attr.value, *attr.pos);
|
||
else if (n == "name")
|
||
name = state.forceStringNoCtx(*attr.value, *attr.pos);
|
||
else
|
||
throw EvalError("unsupported argument '%s' to 'fetchGit', at %s", attr.name, *attr.pos);
|
||
}
|
||
|
||
if (url.empty())
|
||
throw EvalError(format("'url' argument required, at %1%") % pos);
|
||
|
||
} else
|
||
url = state.coerceToString(pos, *args[0], context, false, false);
|
||
|
||
// FIXME: git externals probably can be used to bypass the URI
|
||
// whitelist. Ah well.
|
||
state.checkURI(url);
|
||
|
||
auto gitInfo = exportGit(state.store, url, ref, rev, name);
|
||
|
||
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);
|
||
v.attrs->sort();
|
||
|
||
if (state.allowedPaths)
|
||
state.allowedPaths->insert(state.store->toRealPath(gitInfo.storePath));
|
||
}
|
||
|
||
static RegisterPrimOp r("fetchGit", 1, prim_fetchGit);
|
||
|
||
}
|