mirror of
https://git.lyx.org/repos/lyx.git
synced 2024-11-09 18:31:04 +00:00
Improve file saving strategy
- The TempFile class guarantees to generate a file name, we are not limited to
100 tries of a predictable scheme anymore, which could break if LyX
frequently crashes.
- The temp file name generation has no race condition against another LyX
instance in the same directory anymore.
- Symlinks survive saving again (regression of 10364082c8
).
This commit is contained in:
parent
47721216f0
commit
bf782ee02a
@ -1284,25 +1284,8 @@ bool Buffer::save() const
|
||||
// we first write the file to a new name, then move it to its
|
||||
// proper location once that has been done successfully. that
|
||||
// way we preserve the original file if something goes wrong.
|
||||
string const savepath = fileName().onlyPath().absFileName();
|
||||
int fnum = 1;
|
||||
string const fname = fileName().onlyFileName();
|
||||
string savename = "tmp-" + convert<string>(fnum) + "-" + fname;
|
||||
FileName savefile(addName(savepath, savename));
|
||||
while (savefile.exists()) {
|
||||
// surely that is enough tries?
|
||||
if (fnum > 100) {
|
||||
Alert::error(_("Write failure"),
|
||||
bformat(_("Cannot find temporary filename for:\n %1$s.\n"
|
||||
"Even %2$s exists!"),
|
||||
from_utf8(fileName().absFileName()),
|
||||
from_utf8(savefile.absFileName())));
|
||||
return false;
|
||||
}
|
||||
fnum += 1;
|
||||
savename = "tmp-" + convert<string>(fnum) + "-" + fname;
|
||||
savefile.set(addName(savepath, savename));
|
||||
}
|
||||
TempFile tempfile(fileName().onlyPath(), "tmpXXXXXX.lyx");
|
||||
FileName savefile(tempfile.name());
|
||||
|
||||
LYXERR(Debug::FILES, "Saving to " << savefile.absFileName());
|
||||
if (!writeFile(savefile))
|
||||
@ -1310,6 +1293,7 @@ bool Buffer::save() const
|
||||
|
||||
// we will set this to false if we fail
|
||||
bool made_backup = true;
|
||||
bool const symlink = fileName().isSymLink();
|
||||
if (lyxrc.make_backup) {
|
||||
FileName backupName(absFileName() + '~');
|
||||
if (!lyxrc.backupdir_path.empty()) {
|
||||
@ -1321,7 +1305,7 @@ bool Buffer::save() const
|
||||
|
||||
// Except file is symlink do not copy because of #6587.
|
||||
// Hard links have bad luck.
|
||||
made_backup = fileName().isSymLink() ?
|
||||
made_backup = symlink ?
|
||||
fileName().copyTo(backupName):
|
||||
fileName().moveTo(backupName);
|
||||
|
||||
@ -1333,8 +1317,13 @@ bool Buffer::save() const
|
||||
//LYXERR(Debug::DEBUG, "Fs error: " << fe.what());
|
||||
}
|
||||
}
|
||||
|
||||
if (made_backup && savefile.moveTo(fileName())) {
|
||||
|
||||
// If we have no symlink, we can simply rename the temp file.
|
||||
// Otherwise, we need to copy it so the symlink stays intact.
|
||||
if (!symlink)
|
||||
tempfile.setAutoRemove(false);
|
||||
if (made_backup &&
|
||||
(symlink ? savefile.copyTo(fileName(), true) : savefile.moveTo(fileName()))) {
|
||||
markClean();
|
||||
return true;
|
||||
}
|
||||
|
@ -217,9 +217,26 @@ void FileName::erase()
|
||||
}
|
||||
|
||||
|
||||
bool FileName::copyTo(FileName const & name) const
|
||||
bool FileName::copyTo(FileName const & name, bool keepsymlink) const
|
||||
{
|
||||
LYXERR(Debug::FILES, "Copying " << name);
|
||||
FileNameSet visited;
|
||||
visited.insert(*this);
|
||||
return copyTo(name, keepsymlink, visited);
|
||||
}
|
||||
|
||||
|
||||
bool FileName::copyTo(FileName const & name, bool keepsymlink,
|
||||
FileName::FileNameSet & visited) const
|
||||
{
|
||||
LYXERR(Debug::FILES, "Copying " << name << " keep symlink: " << keepsymlink);
|
||||
if (keepsymlink && name.isSymLink()) {
|
||||
FileName const target(fromqstr(name.d->fi.symLinkTarget()));
|
||||
if (visited.find(target) != visited.end()) {
|
||||
LYXERR(Debug::FILES, "Found circular symlink: " << target);
|
||||
return false;
|
||||
}
|
||||
return copyTo(target, true);
|
||||
}
|
||||
QFile::remove(name.d->fi.absoluteFilePath());
|
||||
bool success = QFile::copy(d->fi.absoluteFilePath(), name.d->fi.absoluteFilePath());
|
||||
if (!success)
|
||||
@ -231,6 +248,7 @@ bool FileName::copyTo(FileName const & name) const
|
||||
|
||||
bool FileName::renameTo(FileName const & name) const
|
||||
{
|
||||
LYXERR(Debug::FILES, "Renaming " << name);
|
||||
bool success = QFile::rename(d->fi.absoluteFilePath(), name.d->fi.absoluteFilePath());
|
||||
if (!success)
|
||||
LYXERR0("Could not rename file " << *this << " to " << name);
|
||||
@ -240,6 +258,7 @@ bool FileName::renameTo(FileName const & name) const
|
||||
|
||||
bool FileName::moveTo(FileName const & name) const
|
||||
{
|
||||
LYXERR(Debug::FILES, "Moving " << name);
|
||||
QFile::remove(name.d->fi.absoluteFilePath());
|
||||
|
||||
bool success = QFile::rename(d->fi.absoluteFilePath(),
|
||||
|
@ -16,6 +16,7 @@
|
||||
#include "support/strfwd.h"
|
||||
|
||||
#include <ctime>
|
||||
#include <set>
|
||||
|
||||
|
||||
namespace lyx {
|
||||
@ -123,7 +124,9 @@ public:
|
||||
/// \return true when file/directory is writable (write test file)
|
||||
/// \warning This methods has different semantics when system level
|
||||
/// copy command, it will overwrite the \c target file if it exists,
|
||||
bool copyTo(FileName const & target) const;
|
||||
/// If \p keepsymlink is true, the copy will be written to the symlink
|
||||
/// target. Otherwise, the symlink will be destroyed.
|
||||
bool copyTo(FileName const & target, bool keepsymlink = false) const;
|
||||
|
||||
/// remove pointed file.
|
||||
/// \return true on success.
|
||||
@ -136,6 +139,8 @@ public:
|
||||
bool renameTo(FileName const & target) const;
|
||||
|
||||
/// move pointed file to \param target.
|
||||
/// If \p target exists it will be overwritten (if it is a symlink,
|
||||
/// the symlink will be destroyed).
|
||||
/// \return true on success.
|
||||
bool moveTo(FileName const & target) const;
|
||||
|
||||
@ -212,6 +217,12 @@ public:
|
||||
|
||||
private:
|
||||
friend bool equivalent(FileName const &, FileName const &);
|
||||
/// Set for tracking of already visited file names.
|
||||
/// Uses operator==() (which may be case insensitive), and not
|
||||
/// equvalent(), so that symlinks are not resolved.
|
||||
typedef std::set<FileName> FileNameSet;
|
||||
/// Helper for public copyTo() to find circular symlink chains
|
||||
bool copyTo(FileName const &, bool, FileNameSet &) const;
|
||||
///
|
||||
struct Private;
|
||||
Private * const d;
|
||||
|
@ -74,5 +74,10 @@ FileName TempFile::name() const
|
||||
}
|
||||
|
||||
|
||||
void TempFile::setAutoRemove(bool autoremove)
|
||||
{
|
||||
d->f.setAutoRemove(autoremove);
|
||||
}
|
||||
|
||||
} // namespace support
|
||||
} // namespace lyx
|
||||
|
@ -46,6 +46,13 @@ public:
|
||||
* This is empty if the file could not be created.
|
||||
*/
|
||||
FileName name() const;
|
||||
/**
|
||||
* Set whether the file should be automatically deleted in the
|
||||
* destructor.
|
||||
* Automatic deletion is the default, but it can be switched off if
|
||||
* the file should be kept, because it should be renamed afterwards.
|
||||
*/
|
||||
void setAutoRemove(bool autoremove);
|
||||
private:
|
||||
///
|
||||
struct Private;
|
||||
|
Loading…
Reference in New Issue
Block a user