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build: recover store path when replacing fails

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This shouldn't happen in normal circumstances, but just in case
attempt to move the temporary path back if possible.
This commit is contained in:
Daiderd Jordan 2020-01-04 17:47:52 +01:00
parent 0de33cc81b
commit b33fefcb92
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1 changed files with 3 additions and 1 deletions
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4
src/libstore/build.cc
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@ -1513,8 +1513,10 @@ void replaceValidPath(const Path & storePath, const Path tmpPath)
Path oldPath = (format("%1%.old-%2%-%3%") % storePath % getpid() % random()).str();
if (pathExists(storePath))
rename(storePath.c_str(), oldPath.c_str());
if (rename(tmpPath.c_str(), storePath.c_str()) == -1)
if (rename(tmpPath.c_str(), storePath.c_str()) == -1) {
rename(oldPath.c_str(), storePath.c_str()); // attempt to recover
throw SysError("moving '%s' to '%s'", tmpPath, storePath);
}
deletePath(oldPath);
}