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Fix #5299

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No matter what, we need to resize the buffer to not have any scratch
space after we do the `read`. In the end of file case, `got` will be 0
from it's initial value.

Before, we forgot to resize in the EOF case with the break. Yes, we know
we didn't recieve any data in that case, but we still have the scatch
space to undo.

Co-Authored-By: Will Fancher <Will.Fancher@Obsidian.Systems>
This commit is contained in:
John Ericson 2021-11-30 21:48:43 +00:00
parent 95157b4e66
commit 2f5c913d4a
1 changed files with 4 additions and 1 deletions
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5
src/libstore/local-store.cc
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@ -8,6 +8,7 @@
#include "references.hh"
#include "callback.hh"
#include "topo-sort.hh"
#include "finally.hh"
#include <iostream>
#include <algorithm>
@ -1333,13 +1334,15 @@ StorePath LocalStore::addToStoreFromDump(Source & source0, const string & name,
auto want = std::min(chunkSize, settings.narBufferSize - oldSize);
dump.resize(oldSize + want);
auto got = 0;
Finally cleanup([&]() {
dump.resize(oldSize + got);
});
try {
got = source.read(dump.data() + oldSize, want);
} catch (EndOfFile &) {
inMemory = true;
break;
}
dump.resize(oldSize + got);
}
std::unique_ptr<AutoDelete> delTempDir;