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downloadCached: Return ETag

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This allows fetchFlake() to return the Git revision of a GitHub
archive.
This commit is contained in:
Eelco Dolstra 2019-02-25 23:20:50 +08:00
parent 6e9182fbc2
commit 529add316c
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GPG key ID: 8170B4726D7198DE
7 changed files with 64 additions and 26 deletions
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49
src/libexpr/primops/flake.cc
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@ -87,7 +87,13 @@ static FlakeRef lookupFlake(EvalState & state, const FlakeRef & flakeRef,
return flakeRef;
}
static Path fetchFlake(EvalState & state, const FlakeRef & flakeRef)
struct FlakeSourceInfo
{
Path storePath;
std::optional<Hash> rev;
};
static FlakeSourceInfo fetchFlake(EvalState & state, const FlakeRef & flakeRef)
{
assert(flakeRef.isDirect());
@ -99,25 +105,36 @@ static Path fetchFlake(EvalState & state, const FlakeRef & flakeRef)
// FIXME: support passing auth tokens for private repos.
auto storePath = getDownloader()->downloadCached(state.store,
fmt("https://api.github.com/repos/%s/%s/tarball/%s",
refData->owner, refData->repo,
refData->rev
? refData->rev->to_string(Base16, false)
: refData->ref
? *refData->ref
: "master"),
true, "source");
auto url = fmt("https://api.github.com/repos/%s/%s/tarball/%s",
refData->owner, refData->repo,
refData->rev
? refData->rev->to_string(Base16, false)
: refData->ref
? *refData->ref
: "master");
// FIXME: extract revision hash from ETag.
auto result = getDownloader()->downloadCached(state.store, url, true, "source");
return storePath;
if (!result.etag)
throw Error("did not receive an ETag header from '%s'", url);
if (result.etag->size() != 42 || (*result.etag)[0] != '"' || (*result.etag)[41] != '"')
throw Error("ETag header '%s' from '%s' is not a Git revision", *result.etag, url);
FlakeSourceInfo info;
info.storePath = result.path;
info.rev = Hash(std::string(*result.etag, 1, result.etag->size() - 2), htSHA1);
return info;
}
else if (auto refData = std::get_if<FlakeRef::IsGit>(&flakeRef.data)) {
auto gitInfo = exportGit(state.store, refData->uri, refData->ref,
refData->rev ? refData->rev->to_string(Base16, false) : "", "source");
return gitInfo.storePath;
FlakeSourceInfo info;
info.storePath = gitInfo.storePath;
info.rev = Hash(gitInfo.rev, htSHA1);
return info;
}
else abort();
@ -138,7 +155,11 @@ struct Flake
static Flake getFlake(EvalState & state, const FlakeRef & flakeRef)
{
auto flakePath = fetchFlake(state, flakeRef);
auto sourceInfo = fetchFlake(state, flakeRef);
debug("got flake source '%s' with revision %s",
sourceInfo.storePath, sourceInfo.rev.value_or(Hash(htSHA1)).to_string(Base16, false));
auto flakePath = sourceInfo.storePath;
state.store->assertStorePath(flakePath);
if (state.allowedPaths)