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Merge #15583: wallet: Log and ignore errors in ListWalletDir and IsBerkeleyBtree

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15c69b158d wallet: Log and ignore errors in ListWalletDir and IsBerkeleyBtree (João Barbosa)

Pull request description:

  Use the `noexcept` members of `boost::filesystem::recursive_directory_iterator` in order to ignore `boost::filesystem::directory_iterator::construct: Permission denied` errors. The errors are logged though.

  Steps to reproduce the issue:

  ```sh
  # 1. create directory for -walletdir without read access:
  mkdir /tmp/foo && chmod a-r /tmp/foo

  # 2. run bitcoin-qt and should print an error, but continues running:
  /Volumes/Bitcoin-Core/Bitcoin-Qt.app/Contents/MacOS/Bitcoin-Qt -regtest -walletdir=/tmp/foo
  /private/tmp/foo: Permission denied

  # 4. go to File -> Open Wallet and should segfault:
  EXCEPTION: N5boost10filesystem16filesystem_errorE
  boost::filesystem::directory_iterator::construct: Permission denied: "/private/tmp/foo"
  bitcoin in Runaway exception
  ```

Tree-SHA512: 37e8bf5a1e0defc331030fd511bf9cac2765d01dfbf23e7233f37506e85b8ad07edcde9ba6dae7a2c95700c78d28c7dd248153607381852da96273cb159c4934
This commit is contained in:
Wladimir J. van der Laan 2019-03-14 18:57:32 +01:00
commit 7fa1f6258c
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1 changed files with 11 additions and 2 deletions
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13
src/wallet/walletutil.cpp
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@ -4,6 +4,7 @@
#include <wallet/walletutil.h>
#include <logging.h>
#include <util/system.h>
fs::path GetWalletDir()
@ -33,7 +34,9 @@ static bool IsBerkeleyBtree(const fs::path& path)
// A Berkeley DB Btree file has at least 4K.
// This check also prevents opening lock files.
boost::system::error_code ec;
if (fs::file_size(path, ec) < 4096) return false;
auto size = fs::file_size(path, ec);
if (ec) LogPrintf("%s: %s %s\n", __func__, ec.message(), path.string());
if (size < 4096) return false;
fsbridge::ifstream file(path, std::ios::binary);
if (!file.is_open()) return false;
@ -54,8 +57,14 @@ std::vector<fs::path> ListWalletDir()
const fs::path wallet_dir = GetWalletDir();
const size_t offset = wallet_dir.string().size() + 1;
std::vector<fs::path> paths;
boost::system::error_code ec;
for (auto it = fs::recursive_directory_iterator(wallet_dir, ec); it != fs::recursive_directory_iterator(); it.increment(ec)) {
if (ec) {
LogPrintf("%s: %s %s\n", __func__, ec.message(), it->path().string());
continue;
}
for (auto it = fs::recursive_directory_iterator(wallet_dir); it != fs::recursive_directory_iterator(); ++it) {
// Get wallet path relative to walletdir by removing walletdir from the wallet path.
// This can be replaced by boost::filesystem::lexically_relative once boost is bumped to 1.60.
const fs::path path = it->path().string().substr(offset);