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refs #815 When a cache/settings file has errors, back it up before it can be overwritten.

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This commit is contained in:
Mathew Sutcliffe
2016-12-23 02:25:05 +00:00
parent bda0f42c60
commit 045b2a9f59
2 changed files with 23 additions and 1 deletions
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22
src/blackmisc/valuecache.cpp
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@@ -22,7 +22,6 @@
#include <QCoreApplication>
#include <QDBusMetaType>
#include <QDir>
#include <QFile>
#include <QFileInfo>
#include <QFlags>
#include <QIODevice>
@@ -450,6 +449,7 @@ namespace BlackMisc
if (! messages.isEmpty())
{
ok = false;
backupFile(file);
CLogMessage::preformatted(messages);
}
temp.removeDuplicates(currentValues);
@@ -459,6 +459,26 @@ namespace BlackMisc
(keysMessage.isEmpty() ? o_values.keys().to<QStringList>().join(",") : keysMessage) << dir << (ok ? "successfully" : "with errors");
}
void CValueCache::backupFile(QFile &file) const
{
QDir dir = getCacheRootDirectory();
QString relative = "backups/" + dir.relativeFilePath(file.fileName());
QString absolute = dir.absoluteFilePath(relative);
absolute += "." + QDateTime::currentDateTime().toString(QStringLiteral("yyMMddhhmmss"));
if (QFile::exists(absolute)) { return; }
if (! dir.mkpath(QFileInfo(relative).path()))
{
CLogMessage(this).error("Failed to create %1") << QFileInfo(absolute).path();
return;
}
if (! file.copy(absolute))
{
CLogMessage(this).error("Failed to back up %1: %2") << QFileInfo(file).fileName() << file.errorString();
return;
}
CLogMessage(this).info("Backed up %1 to %2") << QFileInfo(file).fileName() << dir.absoluteFilePath("backups");
}
void CValueCache::markAllAsSaved(const QString &keyPrefix)
{
QMutexLocker lock(&m_mutex);