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use self::PartitionSource::*;
use self::PartitionSource::Path as SourcePath;
use std::fs;
use std::path::{Path, PathBuf};
use std::str::FromStr;
#[derive(Clone, Debug, Hash, PartialEq)]
pub struct PartitionID {
pub variant: PartitionSource,
pub id: String
}
impl PartitionID {
pub fn new(variant: PartitionSource, id: String) -> Self {
Self { variant, id }
}
pub fn new_id(id: String) -> Self {
Self::new(ID, id)
}
pub fn new_label(id: String) -> Self {
Self::new(Label, id)
}
pub fn new_uuid(id: String) -> Self {
Self::new(UUID, id)
}
pub fn new_partlabel(id: String) -> Self {
Self::new(PartLabel, id)
}
pub fn new_partuuid(id: String) -> Self {
Self::new(PartUUID, id)
}
pub fn new_path(id: String) -> Self {
Self::new(SourcePath, id)
}
pub fn get_device_path(&self) -> Option<PathBuf> {
from_uuid(&self.id, Self::dir(self.variant))
}
pub fn get_source<P: AsRef<Path>>(variant: PartitionSource, path: P) -> Option<Self> {
Some(Self {
variant,
id: find_uuid(path.as_ref(), Self::dir(variant))?
})
}
pub fn get_uuid<P: AsRef<Path>>(path: P) -> Option<Self> {
Self::get_source(UUID, path)
}
pub fn get_partuuid<P: AsRef<Path>>(path: P) -> Option<Self> {
Self::get_source(PartUUID, path)
}
fn dir(variant: PartitionSource) -> fs::ReadDir {
let idpath = variant.disk_by_path();
idpath.read_dir().unwrap_or_else(|why| {
panic!(format!("unable to find {:?}: {}", idpath, why));
})
}
}
impl FromStr for PartitionID {
type Err = String;
fn from_str(input: &str) -> Result<Self, Self::Err> {
if input.starts_with('/') {
Ok(PartitionID { variant: SourcePath, id: input.to_owned() })
} else if input.starts_with("ID=") {
Ok(PartitionID { variant: ID, id: input[3..].to_owned() })
} else if input.starts_with("LABEL=") {
Ok(PartitionID { variant: Label, id: input[6..].to_owned() })
} else if input.starts_with("PARTLABEL=") {
Ok(PartitionID { variant: PartLabel, id: input[10..].to_owned() })
} else if input.starts_with("PARTUUID=") {
Ok(PartitionID { variant: PartUUID, id: input[9..].to_owned() })
} else if input.starts_with("UUID=") {
Ok(PartitionID { variant: UUID, id: input[5..].to_owned() })
} else {
Err(format!("'{}' is not a valid PartitionID string", input))
}
}
}
#[derive(Copy, Clone, Debug, Hash, PartialEq)]
pub enum PartitionSource {
ID,
Label,
PartLabel,
PartUUID,
Path,
UUID
}
impl From<PartitionSource> for &'static str {
fn from(pid: PartitionSource) -> &'static str {
match pid {
PartitionSource::ID => "id",
PartitionSource::Label => "label",
PartitionSource::PartLabel => "partlabel",
PartitionSource::PartUUID => "partuuid",
PartitionSource::Path => "path",
PartitionSource::UUID => "uuid"
}
}
}
impl PartitionSource {
fn disk_by_path(self) -> PathBuf {
PathBuf::from(["/dev/disk/by-", <&'static str>::from(self)].concat())
}
}
#[derive(Debug, Default, Clone, Hash, PartialEq)]
pub struct PartitionIdentifiers {
id: Option<String>,
label: Option<String>,
part_label: Option<String>,
part_uuid: Option<String>,
path: Option<String>,
uuid: Option<String>
}
impl PartitionIdentifiers {
pub fn from_path<P: AsRef<Path>>(path: P) -> PartitionIdentifiers {
let path = path.as_ref();
PartitionIdentifiers {
path: PartitionID::get_source(SourcePath, path).map(|id| id.id),
id: PartitionID::get_source(ID, path).map(|id| id.id),
label: PartitionID::get_source(Label, path).map(|id| id.id),
part_label: PartitionID::get_source(PartLabel, path).map(|id| id.id),
part_uuid: PartitionID::get_source(PartUUID, path).map(|id| id.id),
uuid: PartitionID::get_source(UUID, path).map(|id| id.id),
}
}
}
fn find_uuid(path: &Path, uuid_dir: fs::ReadDir) -> Option<String> {
if let Ok(path) = path.canonicalize() {
for uuid_entry in uuid_dir.filter_map(|entry| entry.ok()) {
if let Ok(ref uuid_path) = uuid_entry.path().canonicalize() {
if uuid_path == &path {
if let Some(uuid_entry) = uuid_entry.file_name().to_str() {
return Some(uuid_entry.into());
}
}
}
}
}
None
}
fn from_uuid(uuid: &str, uuid_dir: fs::ReadDir) -> Option<PathBuf> {
for uuid_entry in uuid_dir.filter_map(|entry| entry.ok()) {
let uuid_entry = uuid_entry.path();
if let Some(name) = uuid_entry.file_name() {
if name == uuid {
if let Ok(uuid_entry) = uuid_entry.canonicalize() {
return Some(uuid_entry);
}
}
}
}
None
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn partition_id_from_str() {
assert_eq!(
"/dev/sda1".parse::<PartitionID>(),
Ok(PartitionID::new_path("/dev/sda1".into()))
);
assert_eq!(
"ID=abcd".parse::<PartitionID>(),
Ok(PartitionID::new_id("abcd".into()))
);
assert_eq!(
"LABEL=abcd".parse::<PartitionID>(),
Ok(PartitionID::new_label("abcd".into()))
);
assert_eq!(
"PARTLABEL=abcd".parse::<PartitionID>(),
Ok(PartitionID::new_partlabel("abcd".into()))
);
assert_eq!(
"PARTUUID=abcd".parse::<PartitionID>(),
Ok(PartitionID::new_partuuid("abcd".into()))
);
assert_eq!(
"UUID=abcd".parse::<PartitionID>(),
Ok(PartitionID::new_uuid("abcd".into()))
);
}
}