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Per a suggestion of JMarc's, first write the saved file to a

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temporary name, then move it to its real location if we succeed.
This prevents our over-writing the existing file with a corrupt
one.
This commit is contained in:
Richard Heck 2014-06-03 10:42:07 -04:00
parent 361901a773
commit 10364082c8
1 changed files with 44 additions and 17 deletions
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59
src/Buffer.cpp
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@ -1276,12 +1276,38 @@ bool Buffer::save() const
// We don't need autosaves in the immediate future. (Asger)
resetAutosaveTimers();
FileName backupName;
bool madeBackup = false;
// if the file does not yet exist, none of the backup activity
// that follows is necessary
if (!fileName().exists())
return writeFile(fileName());
// make a backup if the file already exists
if (lyxrc.make_backup && fileName().exists()) {
backupName = FileName(absFileName() + '~');
// 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();
string savename = "tmp-" + fileName().onlyFileName();
FileName savefile(addName(savepath, savename));
while (savefile.exists()) {
if (savefile.absFileName().size() > 1024) {
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;
}
savename = "tmp-" + savename;
savefile.set(addName(savepath, savename));
}
LYXERR(Debug::FILES, "Saving to " << savefile.absFileName());
if (!writeFile(savefile))
return false;
// we will set this to false if we fail
bool made_backup = true;
if (lyxrc.make_backup) {
FileName backupName(absFileName() + '~');
if (!lyxrc.backupdir_path.empty()) {
string const mangledName =
subst(subst(backupName.absFileName(), '/', '!'), ':', '!');
@ -1291,12 +1317,11 @@ bool Buffer::save() const
// Except file is symlink do not copy because of #6587.
// Hard links have bad luck.
if (fileName().isSymLink())
madeBackup = fileName().copyTo(backupName);
else
madeBackup = fileName().moveTo(backupName);
made_backup = fileName().isSymLink() ?
fileName().copyTo(backupName):
fileName().moveTo(backupName);
if (!madeBackup) {
if (!made_backup) {
Alert::error(_("Backup failure"),
bformat(_("Cannot create backup file %1$s.\n"
"Please check whether the directory exists and is writable."),
@ -1305,15 +1330,17 @@ bool Buffer::save() const
}
}
if (writeFile(d->filename)) {
if (made_backup && savefile.moveTo(fileName())) {
markClean();
return true;
} else {
// Saving failed, so backup is not backup
if (madeBackup)
backupName.moveTo(d->filename);
return false;
}
// else
Alert::error(_("Write failure"),
bformat(_("Cannot move saved file to:\n %1$s.\n"
"But the file has successfully been saved as:\n %2$s."),
from_utf8(fileName().absFileName()),
from_utf8(savefile.absFileName())));
return false;
}