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Improve durability of schema version file writes

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- call close explicitly in writeFile to prevent the close exception
  from being ignored
- fsync after writing schema file to flush data to disk
- fsync schema file parent to flush metadata to disk

https://github.com/NixOS/nix/issues/7064
This commit is contained in:
squalus 2022-09-19 11:15:31 -07:00
parent 9d860f3467
commit 1b595026e1
3 changed files with 45 additions and 7 deletions
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8
src/libutil/util.hh
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@ -115,9 +115,12 @@ std::string readFile(const Path & path);
void readFile(const Path & path, Sink & sink);
/* Write a string to a file. */
void writeFile(const Path & path, std::string_view s, mode_t mode = 0666);
void writeFile(const Path & path, std::string_view s, mode_t mode = 0666, bool sync = false);
void writeFile(const Path & path, Source & source, mode_t mode = 0666);
void writeFile(const Path & path, Source & source, mode_t mode = 0666, bool sync = false);
/* Flush a file's parent directory to disk */
void syncParent(const Path & path);
/* Read a line from a file descriptor. */
std::string readLine(int fd);
@ -231,6 +234,7 @@ public:
explicit operator bool() const;
int release();
void close();
void fsync();
};