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Return errors when swap_nonatomic fails #8

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Merged
debris merged 2 commits into from
Sep 11, 2018
Merged

Return errors when swap_nonatomic fails #8

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c197084
Return errors when `swap_nonatomic` fails
ngotchac Sep 7, 2018
ad6b44f
PR Grumble
ngotchac Sep 7, 2018
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10 changes: 6 additions & 4 deletions src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -40,21 +40,23 @@ pub fn swap_nonatomic<A, B>(a: A, b: B) -> io::Result<()> where A: AsRef<Path>,

match fs::rename(b, a) {
Ok(_) => (),
Err(_) => {
error => {
// let's try to recover the previous state
// if it fails, there is nothing we can do
return fs::rename(&tmp, a);
fs::rename(&tmp, a)?;
return error
},
}

// rename tmp to b
match fs::rename(&tmp, b) {
Ok(_) => Ok(()),
Err(_) => {
error => {
// let's try to recover to previous state
// if it fails, there is nothing we can do
fs::rename(a, b)?;
fs::rename(&tmp, a)
fs::rename(&tmp, a)?;
error
},
}
}
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