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Add date of last commit to SourceInfo

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This is primarily useful for version string generation, where we need
a monotonically increasing number. The revcount is the preferred thing
to use, but isn't available for GitHub flakes (since it requires
fetching the entire history). The last commit timestamp OTOH can be
extracted from GitHub tarballs.
This commit is contained in:
Eelco Dolstra 2019-05-28 20:34:02 +02:00
parent 479757dc15
commit 0f840483c7
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GPG key ID: 8170B4726D7198DE
7 changed files with 61 additions and 30 deletions
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39
src/libexpr/primops/flake.cc
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@ -8,6 +8,8 @@
#include <iostream>
#include <queue>
#include <regex>
#include <ctime>
#include <iomanip>
#include <nlohmann/json.hpp>
namespace nix {
@ -232,6 +234,18 @@ static SourceInfo fetchFlake(EvalState & state, const FlakeRef & flakeRef, bool
if (evalSettings.pureEval && !impureIsAllowed && !resolvedRef.isImmutable())
throw Error("requested to fetch mutable flake '%s' in pure mode", resolvedRef);
auto doGit = [&](const GitInfo & gitInfo) {
FlakeRef ref(resolvedRef.baseRef());
ref.ref = gitInfo.ref;
ref.rev = gitInfo.rev;
SourceInfo info(ref);
info.storePath = gitInfo.storePath;
info.revCount = gitInfo.revCount;
info.narHash = state.store->queryPathInfo(info.storePath)->narHash;
info.lastModified = gitInfo.lastModified;
return info;
};
// This only downloads only one revision of the repo, not the entire history.
if (auto refData = std::get_if<FlakeRef::IsGitHub>(&resolvedRef.data)) {
@ -270,29 +284,13 @@ static SourceInfo fetchFlake(EvalState & state, const FlakeRef & flakeRef, bool
// This downloads the entire git history
else if (auto refData = std::get_if<FlakeRef::IsGit>(&resolvedRef.data)) {
auto gitInfo = exportGit(state.store, refData->uri, resolvedRef.ref, resolvedRef.rev, "source");
FlakeRef ref(resolvedRef.baseRef());
ref.ref = gitInfo.ref;
ref.rev = gitInfo.rev;
SourceInfo info(ref);
info.storePath = gitInfo.storePath;
info.revCount = gitInfo.revCount;
info.narHash = state.store->queryPathInfo(info.storePath)->narHash;
return info;
return doGit(exportGit(state.store, refData->uri, resolvedRef.ref, resolvedRef.rev, "source"));
}
else if (auto refData = std::get_if<FlakeRef::IsPath>(&resolvedRef.data)) {
if (!pathExists(refData->path + "/.git"))
throw Error("flake '%s' does not reference a Git repository", refData->path);
auto gitInfo = exportGit(state.store, refData->path, {}, {}, "source");
FlakeRef ref(resolvedRef.baseRef());
ref.ref = gitInfo.ref;
ref.rev = gitInfo.rev;
SourceInfo info(ref);
info.storePath = gitInfo.storePath;
info.revCount = gitInfo.revCount;
info.narHash = state.store->queryPathInfo(info.storePath)->narHash;
return info;
return doGit(exportGit(state.store, refData->path, {}, {}, "source"));
}
else abort();
@ -529,6 +527,11 @@ static void emitSourceInfoAttrs(EvalState & state, const SourceInfo & sourceInfo
if (sourceInfo.revCount)
mkInt(*state.allocAttr(vAttrs, state.symbols.create("revCount")), *sourceInfo.revCount);
if (sourceInfo.lastModified)
mkString(*state.allocAttr(vAttrs, state.symbols.create("lastModified")),
fmt("%s",
std::put_time(std::gmtime(&*sourceInfo.lastModified), "%Y%m%d%H%M%S")));
}
void callFlake(EvalState & state, const ResolvedFlake & resFlake, Value & v)