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