Inside Bitcoin

1// Copyright (c) 2011-present The Bitcoin Core developers
2// Distributed under the MIT software license, see the accompanying
3// file COPYING or http://www.opensource.org/licenses/mit-license.php.
4
5#include <qt/freespacechecker.h>
6
7#include <qt/guiutil.h>
8#include <util/fs.h>
9
10#include <QDir>
11#include <QString>
12
13#include <cstdint>
14
15void FreespaceChecker::check()
16{
17    QString dataDirStr = intro->getPathToCheck();
18    fs::path dataDir = GUIUtil::QStringToPath(dataDirStr);
19    uint64_t freeBytesAvailable = 0;
20    int replyStatus = ST_OK;
21    QString replyMessage = tr("A new data directory will be created.");
22
23    /* Find first parent that exists, so that fs::space does not fail */
24    fs::path parentDir = dataDir;
25    fs::path parentDirOld = fs::path();
26    while(parentDir.has_parent_path() && !fs::exists(parentDir))
27    {
28        parentDir = parentDir.parent_path();
29
30        /* Check if we make any progress, break if not to prevent an infinite loop here */
31        if (parentDirOld == parentDir)
32            break;
33
34        parentDirOld = parentDir;
35    }
36
37    try {
38        freeBytesAvailable = fs::space(parentDir).available;
39        if(fs::exists(dataDir))
40        {
41            if(fs::is_directory(dataDir))
42            {
43                QString separator = "<code>" + QDir::toNativeSeparators("/") + tr("name") + "</code>";
44                replyStatus = ST_OK;
45                replyMessage = tr("Directory already exists. Add %1 if you intend to create a new directory here.").arg(separator);
46            } else {
47                replyStatus = ST_ERROR;
48                replyMessage = tr("Path already exists, and is not a directory.");
49            }
50        }
51    } catch (const fs::filesystem_error&)
52    {
53        /* Parent directory does not exist or is not accessible */
54        replyStatus = ST_ERROR;
55        replyMessage = tr("Cannot create data directory here.");
56    }
57    Q_EMIT reply(replyStatus, replyMessage, freeBytesAvailable);
58}
59