Uber refactoring

src/alma.rs

@@ -1,54 +0,0 @@
-use super::block::BlockDevice;
-use super::cryptsetup::EncryptedDevice;
-use super::error::{Error, ErrorKind};
-use super::mountstack::{Filesystem, MountStack};
-use failure::ResultExt;
-use log::{debug, info};
-use std::fs;
-use std::path::{Path, PathBuf};
-
-pub struct ALMA<'a> {
-    block: BlockDevice,
-    encrypted_root: Option<EncryptedDevice<'a>>,
-}
-
-impl<'a> ALMA<'a> {
-    pub fn new(block: BlockDevice, encrypted_root: Option<EncryptedDevice<'a>>) -> Self {
-        Self {
-            block,
-            encrypted_root,
-        }
-    }
-
-    pub fn mount<'b>(&self, path: &'b Path) -> Result<MountStack<'b>, Error> {
-        let mut mount_stack = MountStack::new();
-
-        let root_device = if let Some(encrypted_root) = &self.encrypted_root {
-            PathBuf::from(encrypted_root.path())
-        } else {
-            self.block.partition_device_path(3)?
-        };
-        debug!("Root partition: {}", root_device.display());
-
-        info!("Mounting filesystems to {}", path.display());
-        mount_stack
-            .mount(&root_device, path, Filesystem::Ext4, None)
-            .context(ErrorKind::Mounting)?;
-
-        let boot_point = path.join("boot");
-        if !boot_point.exists() {
-            fs::create_dir(&boot_point).context(ErrorKind::CreateBoot)?;
-        }
-
-        mount_stack
-            .mount(
-                &self.block.partition_device_path(1)?,
-                boot_point,
-                Filesystem::Vfat,
-                None,
-            )
-            .context(ErrorKind::Mounting)?;
-
-        Ok(mount_stack)
-    }
-}

src/cryptsetup.rs

@@ -1,68 +0,0 @@
-use super::error::{Error, ErrorKind};
-use super::process::CommandExt;
-use super::tool::Tool;
-use log::{debug, warn};
-use std::path::{Path, PathBuf};
-
-pub struct EncryptedDevice<'a> {
-    cryptsetup: &'a Tool,
-    name: &'a str,
-    path: PathBuf,
-}
-
-impl<'a> EncryptedDevice<'a> {
-    pub fn prepare(cryptsetup: &Tool, device: &Path) -> Result<(), Error> {
-        debug!("Preparing encrypted device in {}", device.display());
-        cryptsetup
-            .execute()
-            .arg("luksFormat")
-            .arg("-q")
-            .arg(device)
-            .run(ErrorKind::LuksSetup)?;
-
-        Ok(())
-    }
-
-    pub fn open(
-        cryptsetup: &'a Tool,
-        device: &Path,
-        name: &'a str,
-    ) -> Result<EncryptedDevice<'a>, Error> {
-        debug!("Opening encrypted device {} as {}", device.display(), name);
-        cryptsetup
-            .execute()
-            .arg("open")
-            .arg(device)
-            .arg(name)
-            .run(ErrorKind::LuksOpen)?;
-
-        Ok(Self {
-            cryptsetup,
-            name,
-            path: PathBuf::from("/dev/mapper").join(name),
-        })
-    }
-
-    fn _close(&mut self) -> Result<(), Error> {
-        debug!("Closing encrypted device {}", self.name);
-        self.cryptsetup
-            .execute()
-            .arg("close")
-            .arg(self.name)
-            .run(ErrorKind::LuksClose)?;
-
-        Ok(())
-    }
-
-    pub fn path(&self) -> &Path {
-        &self.path
-    }
-}
-
-impl<'a> Drop for EncryptedDevice<'a> {
-    fn drop(&mut self) {
-        if self._close().is_err() {
-            warn!("Error closing {}", self.name);
-        }
-    }
-}

src/main.rs

@@ -1,15 +1,11 @@
-mod alma;
-mod block;
-mod cryptsetup;
 mod error;
-mod mountstack;
 mod process;
+mod storage;
 mod tool;
 
-use crate::alma::ALMA;
-use crate::cryptsetup::EncryptedDevice;
 use crate::error::*;
 use crate::process::CommandExt;
+use crate::storage::*;
 use crate::tool::Tool;
 use failure::{Fail, ResultExt};
 use log::{debug, error, info, warn};
@@ -17,7 +13,7 @@ use nix::sys::signal;
 use simplelog::*;
 use std::fs;
 use std::io::Write;
-use std::path::PathBuf;
+use std::path::{Path, PathBuf};
 use std::process::exit;
 use std::thread;
 use std::time::Duration;
@@ -89,6 +85,34 @@ struct ChrootCommand {
     command: Vec<String>,
 }
 
+fn mount<'a>(
+    mount_path: &Path,
+    boot_filesystem: &'a Filesystem,
+    root_filesystem: &'a Filesystem,
+) -> Result<MountStack<'a>, Error> {
+    let mut mount_stack = MountStack::new();
+    debug!(
+        "Root partition: {}",
+        root_filesystem.block().path().display()
+    );
+
+    info!("Mounting filesystems to {}", mount_path.display());
+    mount_stack
+        .mount(&root_filesystem, mount_path.into(), None)
+        .context(ErrorKind::Mounting)?;
+
+    let boot_point = mount_path.join("boot");
+    if !boot_point.exists() {
+        fs::create_dir(&boot_point).context(ErrorKind::CreateBoot)?;
+    }
+
+    mount_stack
+        .mount(&boot_filesystem, boot_point, None)
+        .context(ErrorKind::Mounting)?;
+
+    Ok(mount_stack)
+}
+
 fn fix_fstab(fstab: &str) -> String {
     fstab
         .lines()
@@ -115,11 +139,9 @@ fn create(command: CreateCommand) -> Result<(), Error> {
         None
     };
 
-    let block_device = block::BlockDevice::from_path(command.block_device)?;
-
+    let storage_device = storage::StorageDevice::from_path(command.block_device)?;
     let mount_point = tempdir().context(ErrorKind::TmpDirError)?;
-
-    let disk_path = block_device.device_path();
+    let disk_path = storage_device.path();
 
     info!("Partitioning the block device");
     debug!("{:?}", disk_path);
@@ -141,38 +163,31 @@ fn create(command: CreateCommand) -> Result<(), Error> {
     thread::sleep(Duration::from_millis(1000));
 
     info!("Formatting filesystems");
-    let boot_partition = block_device.partition_device_path(1)?;
-    mkfat
-        .execute()
-        .arg("-F32")
-        .arg(&boot_partition)
-        .run(ErrorKind::Formatting)?;
+    let boot_partition = storage_device.get_partition(1)?;
+    let boot_filesystem = Filesystem::format(&boot_partition, FilesystemType::Vfat, &mkfat)?;
 
-    let root_partition = block_device.partition_device_path(3)?;
+    let root_partition_base = storage_device.get_partition(3)?;
     let encrypted_root = if let Some(cryptsetup) = &cryptsetup {
         info!("Encrypting the root filesystem");
-        EncryptedDevice::prepare(&cryptsetup, &root_partition)?;
+        EncryptedDevice::prepare(&cryptsetup, &root_partition_base)?;
         Some(EncryptedDevice::open(
             cryptsetup,
-            &root_partition,
-            "alma_root",
+            &root_partition_base,
+            "alma_root".into(),
         )?)
     } else {
         None
     };
 
-    mkext4
-        .execute()
-        .arg("-F")
-        .arg(if let Some(device) = &encrypted_root {
-            device.path()
-        } else {
-            &root_partition
-        })
-        .run(ErrorKind::Formatting)?;
+    let root_partition = if let Some(e) = encrypted_root.as_ref() {
+        e as &BlockDevice
+    } else {
+        &root_partition_base as &BlockDevice
+    };
 
-    let alma = ALMA::new(block_device, encrypted_root);
-    let mount_stack = alma.mount(mount_point.path())?;
+    let root_filesystem = Filesystem::format(root_partition, FilesystemType::Ext4, &mkext4)?;
+
+    let mount_stack = mount(mount_point.path(), &boot_filesystem, &root_filesystem)?;
 
     info!("Bootstrapping system");
     pacstrap
@@ -246,7 +261,7 @@ fn create(command: CreateCommand) -> Result<(), Error> {
         let uuid = blkid
             .unwrap()
             .execute()
-            .arg(root_partition)
+            .arg(root_partition.path())
             .args(&["-o", "value", "-s", "UUID"])
             .run_text_output(ErrorKind::Partitioning)?;
         let trimmed = uuid.trim();
@@ -295,22 +310,31 @@ fn chroot(command: ChrootCommand) -> Result<(), Error> {
         None
     };
 
-    let block_device = block::BlockDevice::from_path(command.block_device)?;
-
+    let storage_device = storage::StorageDevice::from_path(command.block_device)?;
     let mount_point = tempdir().context(ErrorKind::TmpDirError)?;
-    let root_partition = block_device.partition_device_path(3)?;
+
+    let boot_partition = storage_device.get_partition(1)?;
+    let boot_filesystem = Filesystem::from_partition(&boot_partition, FilesystemType::Vfat);
+
+    let root_partition_base = storage_device.get_partition(3)?;
     let encrypted_root = if let Some(cryptsetup) = &cryptsetup {
         Some(EncryptedDevice::open(
             cryptsetup,
-            &root_partition,
-            "alma_root",
+            &root_partition_base,
+            "alma_root".into(),
         )?)
     } else {
         None
     };
 
-    let alma = ALMA::new(block_device, encrypted_root);
-    let mount_stack = alma.mount(mount_point.path())?;
+    let root_partition = if let Some(e) = encrypted_root.as_ref() {
+        e as &BlockDevice
+    } else {
+        &root_partition_base as &BlockDevice
+    };
+    let root_filesystem = Filesystem::from_partition(root_partition, FilesystemType::Ext4);
+
+    let mount_stack = mount(mount_point.path(), &boot_filesystem, &root_filesystem)?;
 
     arch_chroot
         .execute()

src/storage/crypt.rs

@@ -0,0 +1,80 @@
+use super::markers::BlockDevice;
+use crate::error::{Error, ErrorKind};
+use crate::process::CommandExt;
+use crate::tool::Tool;
+use log::{debug, warn};
+use std::marker::PhantomData;
+use std::path::{Path, PathBuf};
+
+#[derive(Debug)]
+pub struct EncryptedDevice<'t, 'o> {
+    cryptsetup: &'t Tool,
+    name: String,
+    path: PathBuf,
+    origin: PhantomData<&'o BlockDevice>,
+}
+
+impl<'t, 'o> EncryptedDevice<'t, 'o> {
+    pub fn prepare(cryptsetup: &Tool, device: &BlockDevice) -> Result<(), Error> {
+        debug!("Preparing encrypted device in {}", device.path().display());
+        cryptsetup
+            .execute()
+            .arg("luksFormat")
+            .arg("-q")
+            .arg(device.path())
+            .run(ErrorKind::LuksSetup)?;
+
+        Ok(())
+    }
+
+    pub fn open(
+        cryptsetup: &'t Tool,
+        device: &'o BlockDevice,
+        name: String,
+    ) -> Result<EncryptedDevice<'t, 'o>, Error> {
+        debug!(
+            "Opening encrypted device {} as {}",
+            device.path().display(),
+            name
+        );
+        cryptsetup
+            .execute()
+            .arg("open")
+            .arg(device.path())
+            .arg(&name)
+            .run(ErrorKind::LuksOpen)?;
+
+        let path = PathBuf::from("/dev/mapper").join(&name);
+        Ok(Self {
+            cryptsetup,
+            name,
+            path,
+            origin: PhantomData,
+        })
+    }
+
+    fn _close(&mut self) -> Result<(), Error> {
+        debug!("Closing encrypted device {}", self.name);
+        self.cryptsetup
+            .execute()
+            .arg("close")
+            .arg(&self.name)
+            .run(ErrorKind::LuksClose)?;
+
+        Ok(())
+    }
+}
+
+impl<'t, 'o> Drop for EncryptedDevice<'t, 'o> {
+    fn drop(&mut self) {
+        if self._close().is_err() {
+            warn!("Error closing {}", self.name);
+        }
+    }
+}
+
+impl<'t, 'o> BlockDevice for EncryptedDevice<'t, 'o> {
+    fn path(&self) -> &Path {
+        &self.path
+    }
+}

src/storage/filesystem.rs

@@ -0,0 +1,57 @@
+use super::markers::BlockDevice;
+use crate::{
+    error::{Error, ErrorKind},
+    process::CommandExt,
+    tool::Tool,
+};
+
+#[derive(Debug, Clone, Copy)]
+pub enum FilesystemType {
+    Ext4,
+    Vfat,
+}
+
+impl FilesystemType {
+    pub fn to_mount_type(self) -> &'static str {
+        match self {
+            FilesystemType::Ext4 => "ext4",
+            FilesystemType::Vfat => "vfat",
+        }
+    }
+}
+
+#[derive(Debug)]
+pub struct Filesystem<'a> {
+    fs_type: FilesystemType,
+    block: &'a BlockDevice,
+}
+
+impl<'a> Filesystem<'a> {
+    pub fn format(
+        block: &'a BlockDevice,
+        fs_type: FilesystemType,
+        mkfs: &Tool,
+    ) -> Result<Self, Error> {
+        let mut command = mkfs.execute();
+        match fs_type {
+            FilesystemType::Ext4 => command.arg("-F").arg(block.path()),
+            FilesystemType::Vfat => command.arg("-F32").arg(block.path()),
+        };
+
+        command.run(ErrorKind::Formatting)?;
+
+        Ok(Self { fs_type, block })
+    }
+
+    pub fn from_partition(block: &'a BlockDevice, fs_type: FilesystemType) -> Self {
+        Self { fs_type, block }
+    }
+
+    pub fn block(&self) -> &BlockDevice {
+        self.block
+    }
+
+    pub fn fs_type(&self) -> FilesystemType {
+        self.fs_type
+    }
+}

src/storage/markers.rs

@@ -0,0 +1,7 @@
+use std::path::Path;
+
+pub trait BlockDevice: std::fmt::Debug {
+    fn path(&self) -> &Path;
+}
+
+pub trait Origin {}

src/storage/mod.rs

@@ -0,0 +1,12 @@
+mod crypt;
+mod filesystem;
+mod markers;
+mod mount_stack;
+mod partition;
+mod storage_device;
+
+pub use crypt::EncryptedDevice;
+pub use filesystem::{Filesystem, FilesystemType};
+pub use markers::BlockDevice;
+pub use mount_stack::MountStack;
+pub use storage_device::StorageDevice;

src/storage/mount_stack.rs

@@ -1,52 +1,38 @@
-use super::error::{Error, ErrorKind};
+use super::Filesystem;
+use crate::error::{Error, ErrorKind};
 use failure::Fail;
 use log::{debug, warn};
 use nix;
 use nix::mount::{mount, umount, MsFlags};
-use std::borrow::Cow;
-use std::path::Path;
-
-#[derive(Debug, Clone, Copy)]
-pub enum Filesystem {
-    Ext4,
-    Vfat,
-}
-
-impl Filesystem {
-    fn to_type(self) -> &'static str {
-        match self {
-            Filesystem::Ext4 => "ext4",
-            Filesystem::Vfat => "vfat",
-        }
-    }
-}
+use std::marker::PhantomData;
+use std::path::PathBuf;
 
 pub struct MountStack<'a> {
-    targets: Vec<Cow<'a, Path>>,
+    targets: Vec<PathBuf>,
+    filesystems: PhantomData<Filesystem<'a>>,
 }
 
 impl<'a> MountStack<'a> {
     pub fn new() -> Self {
         MountStack {
             targets: Vec::new(),
+            filesystems: PhantomData,
         }
     }
 
     #[must_use]
-    pub fn mount<T: Into<Cow<'a, Path>>>(
+    pub fn mount(
         &mut self,
-        source: &Path,
-        target: T,
-        filesystem: Filesystem,
+        filesystem: &'a Filesystem,
+        target: PathBuf,
         options: Option<&str>,
     ) -> nix::Result<()> {
-        let target = target.into();
-
-        debug!("Mounting {:?} ({:?}) to {:?}", source, filesystem, target);
+        let source = filesystem.block().path();
+        debug!("Mounting {:?} to {:?}", filesystem, target);
         mount(
             Some(source),
-            target.as_ref(),
-            Some(filesystem.to_type()),
+            &target,
+            Some(filesystem.fs_type().to_mount_type()),
             MsFlags::MS_NOATIME,
             options,
         )?;
@@ -59,7 +45,7 @@ impl<'a> MountStack<'a> {
 
         while let Some(target) = self.targets.pop() {
             debug!("Unmounting {}", target.display());
-            if let Err(e) = umount(target.as_ref()) {
+            if let Err(e) = umount(&target) {
                 warn!("Unable to umount {}: {}", target.display(), e);
                 result = Err(Error::from(e.context(ErrorKind::UmountFailure)));
             };

src/storage/partition.rs

@@ -0,0 +1,24 @@
+use super::markers::{BlockDevice, Origin};
+use std::marker::PhantomData;
+use std::path::{Path, PathBuf};
+
+#[derive(Debug)]
+pub struct Partition<'a> {
+    path: PathBuf,
+    origin: PhantomData<&'a Origin>,
+}
+
+impl<'a> Partition<'a> {
+    pub fn new<T: Origin + 'a>(path: PathBuf) -> Self {
+        Self {
+            path,
+            origin: PhantomData,
+        }
+    }
+}
+
+impl<'a> BlockDevice for Partition<'a> {
+    fn path(&self) -> &Path {
+        &self.path
+    }
+}

src/storage/storage_device.rs

@@ -1,15 +1,18 @@
-use super::error::{Error, ErrorKind};
+use super::markers::{BlockDevice, Origin};
+use super::partition::Partition;
+use crate::error::{Error, ErrorKind};
 use failure::ResultExt;
 use log::debug;
 use std::fs::read_to_string;
-use std::path::PathBuf;
+use std::path::{Path, PathBuf};
 
 #[derive(Debug)]
-pub struct BlockDevice {
+pub struct StorageDevice {
     name: String,
+    path: PathBuf,
 }
 
-impl BlockDevice {
+impl StorageDevice {
     pub fn from_path(path: PathBuf) -> Result<Self, Error> {
         let real_path = path.canonicalize().context(ErrorKind::DeviceQuery)?;
         let device_name = real_path
@@ -24,8 +27,11 @@ impl BlockDevice {
         );
 
         drop(path);
-        let _self = Self { name: device_name };
-        if !(_self.is_removable()? || _self.is_loop_device()) {
+        let _self = Self {
+            name: device_name,
+            path: real_path,
+        };
+        if !(_self.is_removable_device()? || _self.is_loop_device()) {
             return Err(ErrorKind::DangerousDevice)?;
         }
 
@@ -38,7 +44,7 @@ impl BlockDevice {
         path
     }
 
-    fn is_removable(&self) -> Result<bool, Error> {
+    fn is_removable_device(&self) -> Result<bool, Error> {
         let mut path = self.sys_path();
         path.push("removable");
 
@@ -55,13 +61,7 @@ impl BlockDevice {
         path.exists()
     }
 
-    pub fn device_path(&self) -> PathBuf {
-        let mut path = PathBuf::from("/dev");
-        path.push(self.name.clone());
-        path
-    }
-
-    pub fn partition_device_path(&self, index: u8) -> Result<PathBuf, Error> {
+    pub fn get_partition(&self, index: u8) -> Result<Partition, Error> {
         let name = if self.name.chars().rev().next().unwrap().is_digit(10) {
             format!("{}p{}", self.name, index)
         } else {
@@ -74,6 +74,14 @@ impl BlockDevice {
         if !path.exists() {
             return Err(ErrorKind::NoSuchPartition(index).into());
         }
-        Ok(path)
+        Ok(Partition::new::<Self>(path))
     }
 }
+
+impl BlockDevice for StorageDevice {
+    fn path(&self) -> &Path {
+        &self.path
+    }
+}
+
+impl Origin for StorageDevice {}