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better error msg when db dir open fails

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The previous poor error message was reported by Marlon Hendred:
https://groups.google.com/g/moonfire-nvr-users/c/X9k2cOCJUDQ/m/1y1ikrWoAAAJ
This commit is contained in:
Scott Lamb 2020-10-17 16:53:57 -07:00
parent cc93768a9a
commit d83bb1bf4d
1 changed files with 9 additions and 3 deletions
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12
src/cmds/mod.rs
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@ -53,11 +53,17 @@ enum OpenMode {
/// Locks the directory without opening the database.
/// The returned `dir::Fd` holds the lock and should be kept open as long as the `Connection` is.
fn open_dir(db_dir: &Path, mode: OpenMode) -> Result<dir::Fd, Error> {
let dir = dir::Fd::open(db_dir, mode == OpenMode::Create)?;
let dir = dir::Fd::open(db_dir, mode == OpenMode::Create)
.map_err(|e| e.context(if e == nix::Error::Sys(nix::errno::Errno::ENOENT) {
format!("db dir {} not found; try running moonfire-nvr init",
db_dir.display())
} else {
format!("unable to open db dir {}: {}", db_dir.display(), &e)
}))?;
let ro = mode == OpenMode::ReadOnly;
dir.lock(if ro { FlockArg::LockSharedNonblock } else { FlockArg::LockExclusiveNonblock })
.map_err(|e| e.context(format!("db dir {:?} already in use; can't get {} lock",
db_dir, if ro { "shared" } else { "exclusive" })))?;
.map_err(|e| e.context(format!("db dir {} already in use; can't get {} lock",
db_dir.display(), if ro { "shared" } else { "exclusive" })))?;
Ok(dir)
}