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libutil: writeFile variant for file descriptors

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`writeFile` lose its `sync` boolean flag to make things simpler.

A new `writeFileAndSync` function is created and all call sites are
converted to it.

Change-Id: Ib871a5283a9c047db1e4fe48a241506e4aab9192
Signed-off-by: Raito Bezarius <raito@lix.systems>
This commit is contained in:
Raito Bezarius 2025-03-26 01:06:03 +01:00 • committed by Jörg Thalheim
parent 002d202653
commit 034f59bbb9
3 changed files with 39 additions and 13 deletions
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4
src/libstore/local-store.cc
View file

@ -247,7 +247,7 @@ LocalStore::LocalStore(ref<const Config> config)
else if (curSchema == 0) { /* new store */
curSchema = nixSchemaVersion;
openDB(*state, true);
writeFile(schemaPath, fmt("%1%", curSchema), 0666, true);
writeFileAndSync(schemaPath, fmt("%1%", curSchema), 0666);
}
else if (curSchema < nixSchemaVersion) {
@ -298,7 +298,7 @@ LocalStore::LocalStore(ref<const Config> config)
txn.commit();
}
writeFile(schemaPath, fmt("%1%", nixSchemaVersion), 0666, true);
writeFileAndSync(schemaPath, fmt("%1%", nixSchemaVersion), 0666);
lockFile(globalLock.get(), ltRead, true);
}

35
src/libutil/file-system.cc
View file

@ -304,7 +304,7 @@ void readFile(const Path & path, Sink & sink, bool memory_map)
}
void writeFile(const Path & path, std::string_view s, mode_t mode, bool sync)
void writeFile(const Path & path, std::string_view s, mode_t mode)
{
AutoCloseFD fd = toDescriptor(open(path.c_str(), O_WRONLY | O_TRUNC | O_CREAT
// TODO
@ -314,20 +314,39 @@ void writeFile(const Path & path, std::string_view s, mode_t mode, bool sync)
, mode));
if (!fd)
throw SysError("opening file '%1%'", path);
writeFile(fd, s, mode);
/* Close explicitly to propagate the exceptions. */
fd.close();
}
void writeFile(AutoCloseFD & fd, std::string_view s, mode_t mode)
{
assert(fd);
try {
writeFull(fd.get(), s);
} catch (Error & e) {
e.addTrace({}, "writing file '%1%'", path);
e.addTrace({}, "writing file '%1%'", fd.guessOrInventPath());
throw;
}
if (sync)
fd.fsync();
// Explicitly close to make sure exceptions are propagated.
fd.close();
if (sync)
syncParent(path);
}
void writeFileAndSync(const Path & path, std::string_view s, mode_t mode)
{
{
AutoCloseFD fd{open(path.c_str(), O_WRONLY | O_TRUNC | O_CREAT | O_CLOEXEC, mode)};
if (!fd)
throw SysError("opening file '%1%'", path);
writeFile(fd, s, mode);
fd.fsync();
/* Close explicitly to ensure that exceptions are propagated. */
fd.close();
}
syncParent(path);
}
void writeFile(const Path & path, Source & source, mode_t mode, bool sync)
{

13
src/libutil/include/nix/util/file-system.hh
View file

@ -172,10 +172,10 @@ void readFile(const Path & path, Sink & sink, bool memory_map = true);
/**
* Write a string to a file.
*/
void writeFile(const Path & path, std::string_view s, mode_t mode = 0666, bool sync = false);
static inline void writeFile(const std::filesystem::path & path, std::string_view s, mode_t mode = 0666, bool sync = false)
void writeFile(const Path & path, std::string_view s, mode_t mode = 0666);
static inline void writeFile(const std::filesystem::path & path, std::string_view s, mode_t mode = 0666)
{
return writeFile(path.string(), s, mode, sync);
return writeFile(path.string(), s, mode);
}
void writeFile(const Path & path, Source & source, mode_t mode = 0666, bool sync = false);
@ -184,6 +184,13 @@ static inline void writeFile(const std::filesystem::path & path, Source & source
return writeFile(path.string(), source, mode, sync);
}
void writeFile(AutoCloseFD & fd, std::string_view s, mode_t mode = 0666 );
/**
* Write a string to a file and flush the file and its parents direcotry to disk.
*/
void writeFileAndSync(const Path & path, std::string_view s, mode_t mode = 0666);
/**
* Flush a path's parent directory to disk.
*/