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Factor out commonality between nix-prefetch-url and nix-store --add-fixed

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This commit is contained in:
Eelco Dolstra 2020-07-10 13:21:37 +02:00
parent 7f1a86d57c
commit 5dff49f661
6 changed files with 64 additions and 42 deletions
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34
src/nix-prefetch-url/nix-prefetch-url.cc
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@ -10,7 +10,6 @@
#include "../nix/legacy.hh"
#include "progress-bar.hh"
#include "tarfile.hh"
#include "archive.hh"
#include <iostream>
@ -154,14 +153,15 @@ static int _main(int argc, char * * argv)
/* If an expected hash is given, the file may already exist in
the store. */
Hash hash, expectedHash(ht);
std::optional<Hash> expectedHash;
Hash hash;
std::optional<StorePath> storePath;
if (args.size() == 2) {
expectedHash = Hash(args[1], ht);
const auto recursive = unpack ? FileIngestionMethod::Recursive : FileIngestionMethod::Flat;
storePath = store->makeFixedOutputPath(recursive, expectedHash, name);
storePath = store->makeFixedOutputPath(recursive, *expectedHash, name);
if (store->isValidPath(*storePath))
hash = expectedHash;
hash = *expectedHash;
else
storePath.reset();
}
@ -201,28 +201,12 @@ static int _main(int argc, char * * argv)
tmpFile = unpacked;
}
/* FIXME: inefficient: we're reading/hashing 'tmpFile'
three times. */
auto [narHash, narSize] = hashPath(htSHA256, tmpFile);
const auto method = unpack ? FileIngestionMethod::Recursive : FileIngestionMethod::Flat;
hash = unpack ? hashPath(ht, tmpFile).first : hashFile(ht, tmpFile);
if (expectedHash != Hash(ht) && expectedHash != hash)
throw Error("hash mismatch for '%1%'", uri);
const auto recursive = unpack ? FileIngestionMethod::Recursive : FileIngestionMethod::Flat;
storePath = store->makeFixedOutputPath(recursive, hash, name);
/* Copy the file to the Nix store. */
ValidPathInfo info(*storePath);
info.narHash = narHash;
info.narSize = narSize;
info.ca = FixedOutputHash { .method = recursive, .hash = hash };
auto source = sinkToSource([&](Sink & sink) {
dumpPath(tmpFile, sink);
});
store->addToStore(info, *source);
auto info = store->addToStoreSlow(name, tmpFile, method, ht, expectedHash);
storePath = info.path;
assert(info.ca);
hash = getContentAddressHash(*info.ca);
}
stopProgressBar();