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#include "primops.hh"
#include "eval-inline.hh"
#include "download.hh"
#include "store-api.hh"
#include "pathlocks.hh"
#include <sys/time.h>
#include <regex>
using namespace std::string_literals;
namespace nix {
Path exportGit(ref<Store> store, const std::string & uri,
const std::string & ref, const std::string & rev,
const std::string & name)
{
if (rev != "") {
std::regex revRegex("^[0-9a-fA-F]{40}$");
if (!std::regex_match(rev, revRegex))
throw Error("invalid Git revision '%s'", rev);
}
Path cacheDir = getCacheDir() + "/nix/git";
if (!pathExists(cacheDir)) {
createDirs(cacheDir);
runProgram("git", true, { "init", "--bare", cacheDir });
}
std::string localRef = hashString(htSHA256, fmt("%s-%s", uri, ref)).to_string(Base32, false);
Path localRefFile = cacheDir + "/refs/heads/" + localRef;
/* If the local ref is older than ‘tarball-ttl’ seconds, do a git
fetch to update the local ref to the remote ref. */
time_t now = time(0);
struct stat st;
if (stat(localRefFile.c_str(), &st) != 0 ||
st.st_mtime < now - settings.tarballTtl)
{
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, ref + ":" + localRef });
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.
std::string commitHash = rev != "" ? rev : chomp(readFile(localRefFile));
printTalkative("using revision %s of repo '%s'", uri, commitHash);
std::string storeLinkName = hashString(htSHA512, name + std::string("\0"s) + commitHash).to_string(Base32, false);
Path storeLink = cacheDir + "/" + storeLinkName + ".link";
PathLocks storeLinkLock({storeLink}, fmt("waiting for lock on '%1%'...", storeLink));
if (pathExists(storeLink)) {
auto storePath = readLink(storeLink);
store->addTempRoot(storePath);
if (store->isValidPath(storePath)) {
return storePath;
}
}
// FIXME: should pipe this, or find some better way to extract a
// revision.
auto tar = runProgram("git", true, { "-C", cacheDir, "archive", commitHash });
Path tmpDir = createTempDir();
AutoDelete delTmpDir(tmpDir, true);
runProgram("tar", true, { "x", "-C", tmpDir }, tar);
auto storePath = store->addToStore(name, tmpDir);
replaceSymlink(storePath, storeLink);
return storePath;
}
static void prim_fetchGit(EvalState & state, const Pos & pos, Value * * args, Value & v)
{
// FIXME: cut&paste from fetch().
if (state.restricted) throw Error("'fetchGit' is not allowed in restricted mode");
std::string url;
std::string ref = "master";
std::string rev;
std::string name = "source";
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") {
PathSet context;
url = state.coerceToString(*attr.pos, *attr.value, context, false, false);
if (hasPrefix(url, "/")) url = "file://" + url;
}
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.forceStringNoCtx(*args[0], pos);
Path storePath = exportGit(state.store, url, ref, rev, name);
mkString(v, storePath, PathSet({storePath}));
}
static RegisterPrimOp r("fetchGit", 1, prim_fetchGit);
}
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