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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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12
src/libstore/download.hh
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@ -41,6 +41,12 @@ struct DownloadResult
uint64_t bodySize = 0;
};
struct CachedDownloadResult
{
Path path;
std::optional<std::string> etag;
};
class Store;
struct Downloader
@ -64,8 +70,10 @@ struct Downloader
and is more recent than ‘tarball-ttl’ seconds. Otherwise,
use the recorded ETag to verify if the server has a more
recent version, and if so, download it to the Nix store. */
Path downloadCached(ref<Store> store, const string & uri, bool unpack, string name = "",
const Hash & expectedHash = Hash(), string * effectiveUri = nullptr, int ttl = settings.tarballTtl);
CachedDownloadResult downloadCached(
ref<Store> store, const string & uri, bool unpack, string name = "",
const Hash & expectedHash = Hash(), string * effectiveUri = nullptr,
int ttl = settings.tarballTtl);
enum Error { NotFound, Forbidden, Misc, Transient, Interrupted };
};