Adding upstream version 1:115.7.0.upstream/1%115.7.0upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1068 insertions, 0 deletions

diff --git a/testing/mozbase/rust/mozdevice/src/lib.rs b/testing/mozbase/rust/mozdevice/src/lib.rs
new file mode 100644
index 0000000000..631c4acf2a
--- /dev/null
+++ b/testing/mozbase/rust/mozdevice/src/lib.rs
@@ -0,0 +1,1068 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+pub mod adb;
+pub mod shell;
+
+#[cfg(test)]
+pub mod test;
+
+use log::{debug, info, trace, warn};
+use once_cell::sync::Lazy;
+use regex::Regex;
+use std::collections::BTreeMap;
+use std::convert::TryFrom;
+use std::fs::File;
+use std::io::{self, Read, Write};
+use std::iter::FromIterator;
+use std::net::TcpStream;
+use std::num::{ParseIntError, TryFromIntError};
+use std::path::{Component, Path};
+use std::str::{FromStr, Utf8Error};
+use std::time::{Duration, SystemTime};
+use thiserror::Error;
+pub use unix_path::{Path as UnixPath, PathBuf as UnixPathBuf};
+use uuid::Uuid;
+use walkdir::WalkDir;
+
+use crate::adb::{DeviceSerial, SyncCommand};
+
+pub type Result<T> = std::result::Result<T, DeviceError>;
+
+static SYNC_REGEX: Lazy<Regex> = Lazy::new(|| Regex::new(r"[^A-Za-z0-9_@%+=:,./-]").unwrap());
+
+#[derive(Debug, Clone, Copy, PartialEq)]
+pub enum AndroidStorageInput {
+    Auto,
+    App,
+    Internal,
+    Sdcard,
+}
+
+impl FromStr for AndroidStorageInput {
+    type Err = DeviceError;
+
+    fn from_str(s: &str) -> Result<Self> {
+        match s {
+            "auto" => Ok(AndroidStorageInput::Auto),
+            "app" => Ok(AndroidStorageInput::App),
+            "internal" => Ok(AndroidStorageInput::Internal),
+            "sdcard" => Ok(AndroidStorageInput::Sdcard),
+            _ => Err(DeviceError::InvalidStorage),
+        }
+    }
+}
+
+impl Default for AndroidStorageInput {
+    fn default() -> Self {
+        AndroidStorageInput::Auto
+    }
+}
+
+#[derive(Debug, Clone, Copy, PartialEq)]
+pub enum AndroidStorage {
+    App,
+    Internal,
+    Sdcard,
+}
+
+#[derive(Debug, Error)]
+pub enum DeviceError {
+    #[error("{0}")]
+    Adb(String),
+    #[error(transparent)]
+    FromInt(#[from] TryFromIntError),
+    #[error("Invalid storage")]
+    InvalidStorage,
+    #[error(transparent)]
+    Io(#[from] io::Error),
+    #[error("Missing package")]
+    MissingPackage,
+    #[error("Multiple Android devices online")]
+    MultipleDevices,
+    #[error(transparent)]
+    ParseInt(#[from] ParseIntError),
+    #[error("Unknown Android device with serial '{0}'")]
+    UnknownDevice(String),
+    #[error(transparent)]
+    Utf8(#[from] Utf8Error),
+    #[error(transparent)]
+    WalkDir(#[from] walkdir::Error),
+}
+
+fn encode_message(payload: &str) -> Result<String> {
+    let hex_length = u16::try_from(payload.len()).map(|len| format!("{:0>4X}", len))?;
+
+    Ok(format!("{}{}", hex_length, payload))
+}
+
+fn parse_device_info(line: &str) -> Option<DeviceInfo> {
+    // Turn "serial\tdevice key1:value1 key2:value2 ..." into a `DeviceInfo`.
+    let mut pairs = line.split_whitespace();
+    let serial = pairs.next();
+    let state = pairs.next();
+    if let (Some(serial), Some("device")) = (serial, state) {
+        let info: BTreeMap<String, String> = pairs
+            .filter_map(|pair| {
+                let mut kv = pair.split(':');
+                if let (Some(k), Some(v), None) = (kv.next(), kv.next(), kv.next()) {
+                    Some((k.to_owned(), v.to_owned()))
+                } else {
+                    None
+                }
+            })
+            .collect();
+
+        Some(DeviceInfo {
+            serial: serial.to_owned(),
+            info,
+        })
+    } else {
+        None
+    }
+}
+
+/// Reads the payload length of a host message from the stream.
+fn read_length<R: Read>(stream: &mut R) -> Result<usize> {
+    let mut bytes: [u8; 4] = [0; 4];
+    stream.read_exact(&mut bytes)?;
+
+    let response = std::str::from_utf8(&bytes)?;
+
+    Ok(usize::from_str_radix(response, 16)?)
+}
+
+/// Reads the payload length of a device message from the stream.
+fn read_length_little_endian(reader: &mut dyn Read) -> Result<usize> {
+    let mut bytes: [u8; 4] = [0; 4];
+    reader.read_exact(&mut bytes)?;
+
+    let n: usize = (bytes[0] as usize)
+        + ((bytes[1] as usize) << 8)
+        + ((bytes[2] as usize) << 16)
+        + ((bytes[3] as usize) << 24);
+
+    Ok(n)
+}
+
+/// Writes the payload length of a device message to the stream.
+fn write_length_little_endian(writer: &mut dyn Write, n: usize) -> Result<usize> {
+    let mut bytes = [0; 4];
+    bytes[0] = (n & 0xFF) as u8;
+    bytes[1] = ((n >> 8) & 0xFF) as u8;
+    bytes[2] = ((n >> 16) & 0xFF) as u8;
+    bytes[3] = ((n >> 24) & 0xFF) as u8;
+
+    writer.write(&bytes[..]).map_err(DeviceError::Io)
+}
+
+fn read_response(stream: &mut TcpStream, has_output: bool, has_length: bool) -> Result<Vec<u8>> {
+    let mut bytes: [u8; 1024] = [0; 1024];
+
+    stream.read_exact(&mut bytes[0..4])?;
+
+    if !bytes.starts_with(SyncCommand::Okay.code()) {
+        let n = bytes.len().min(read_length(stream)?);
+        stream.read_exact(&mut bytes[0..n])?;
+
+        let message = std::str::from_utf8(&bytes[0..n]).map(|s| format!("adb error: {}", s))?;
+
+        return Err(DeviceError::Adb(message));
+    }
+
+    let mut response = Vec::new();
+
+    if has_output {
+        stream.read_to_end(&mut response)?;
+
+        if response.starts_with(SyncCommand::Okay.code()) {
+            // Sometimes the server produces OKAYOKAY.  Sometimes there is a transport OKAY and
+            // then the underlying command OKAY.  This is straight from `chromedriver`.
+            response = response.split_off(4);
+        }
+
+        if response.starts_with(SyncCommand::Fail.code()) {
+            // The server may even produce OKAYFAIL, which means the underlying
+            // command failed. First split-off the `FAIL` and length of the message.
+            response = response.split_off(8);
+
+            let message = std::str::from_utf8(&response).map(|s| format!("adb error: {}", s))?;
+
+            return Err(DeviceError::Adb(message));
+        }
+
+        if has_length {
+            if response.len() >= 4 {
+                let message = response.split_off(4);
+                let slice: &mut &[u8] = &mut &*response;
+
+                let n = read_length(slice)?;
+                if n != message.len() {
+                    warn!("adb server response contained hexstring len {} but remaining message length is {}", n, message.len());
+                }
+
+                trace!(
+                    "adb server response was {:?}",
+                    std::str::from_utf8(&message)?
+                );
+
+                return Ok(message);
+            } else {
+                return Err(DeviceError::Adb(format!(
+                    "adb server response did not contain expected hexstring length: {:?}",
+                    std::str::from_utf8(&response)?
+                )));
+            }
+        }
+    }
+
+    Ok(response)
+}
+
+/// Detailed information about an ADB device.
+#[derive(Debug, Eq, PartialEq, Ord, PartialOrd)]
+pub struct DeviceInfo {
+    pub serial: DeviceSerial,
+    pub info: BTreeMap<String, String>,
+}
+
+/// Represents a connection to an ADB host, which multiplexes the connections to
+/// individual devices.
+#[derive(Debug)]
+pub struct Host {
+    /// The TCP host to connect to.  Defaults to `"localhost"`.
+    pub host: Option<String>,
+    /// The TCP port to connect to.  Defaults to `5037`.
+    pub port: Option<u16>,
+    /// Optional TCP read timeout duration.  Defaults to 2s.
+    pub read_timeout: Option<Duration>,
+    /// Optional TCP write timeout duration.  Defaults to 2s.
+    pub write_timeout: Option<Duration>,
+}
+
+impl Default for Host {
+    fn default() -> Host {
+        Host {
+            host: Some("localhost".to_string()),
+            port: Some(5037),
+            read_timeout: Some(Duration::from_secs(2)),
+            write_timeout: Some(Duration::from_secs(2)),
+        }
+    }
+}
+
+impl Host {
+    /// Searches for available devices, and selects the one as specified by `device_serial`.
+    ///
+    /// If multiple devices are online, and no device has been specified,
+    /// the `ANDROID_SERIAL` environment variable can be used to select one.
+    pub fn device_or_default<T: AsRef<str>>(
+        self,
+        device_serial: Option<&T>,
+        storage: AndroidStorageInput,
+    ) -> Result<Device> {
+        let serials: Vec<String> = self
+            .devices::<Vec<_>>()?
+            .into_iter()
+            .map(|d| d.serial)
+            .collect();
+
+        if let Some(ref serial) = device_serial
+            .map(|v| v.as_ref().to_owned())
+            .or_else(|| std::env::var("ANDROID_SERIAL").ok())
+        {
+            if !serials.contains(serial) {
+                return Err(DeviceError::UnknownDevice(serial.clone()));
+            }
+
+            return Device::new(self, serial.to_owned(), storage);
+        }
+
+        if serials.len() > 1 {
+            return Err(DeviceError::MultipleDevices);
+        }
+
+        if let Some(ref serial) = serials.first() {
+            return Device::new(self, serial.to_owned().to_string(), storage);
+        }
+
+        Err(DeviceError::Adb("No Android devices are online".to_owned()))
+    }
+
+    pub fn connect(&self) -> Result<TcpStream> {
+        let stream = TcpStream::connect(format!(
+            "{}:{}",
+            self.host.clone().unwrap_or_else(|| "localhost".to_owned()),
+            self.port.unwrap_or(5037)
+        ))?;
+        stream.set_read_timeout(self.read_timeout)?;
+        stream.set_write_timeout(self.write_timeout)?;
+        Ok(stream)
+    }
+
+    pub fn execute_command(
+        &self,
+        command: &str,
+        has_output: bool,
+        has_length: bool,
+    ) -> Result<String> {
+        let mut stream = self.connect()?;
+
+        stream.write_all(encode_message(command)?.as_bytes())?;
+        let bytes = read_response(&mut stream, has_output, has_length)?;
+        // TODO: should we assert no bytes were read?
+
+        let response = std::str::from_utf8(&bytes)?;
+
+        Ok(response.to_owned())
+    }
+
+    pub fn execute_host_command(
+        &self,
+        host_command: &str,
+        has_length: bool,
+        has_output: bool,
+    ) -> Result<String> {
+        self.execute_command(&format!("host:{}", host_command), has_output, has_length)
+    }
+
+    pub fn features<B: FromIterator<String>>(&self) -> Result<B> {
+        let features = self.execute_host_command("features", true, true)?;
+        Ok(features.split(',').map(|x| x.to_owned()).collect())
+    }
+
+    pub fn devices<B: FromIterator<DeviceInfo>>(&self) -> Result<B> {
+        let response = self.execute_host_command("devices-l", true, true)?;
+
+        let infos: B = response.lines().filter_map(parse_device_info).collect();
+
+        Ok(infos)
+    }
+}
+
+/// Represents an ADB device.
+#[derive(Debug)]
+pub struct Device {
+    /// ADB host that controls this device.
+    pub host: Host,
+
+    /// Serial number uniquely identifying this ADB device.
+    pub serial: DeviceSerial,
+
+    /// adb running as root
+    pub adbd_root: bool,
+
+    /// Flag for rooted device
+    pub is_rooted: bool,
+
+    /// "su 0" command available
+    pub su_0_root: bool,
+
+    /// "su -c" command available
+    pub su_c_root: bool,
+
+    pub run_as_package: Option<String>,
+
+    pub storage: AndroidStorage,
+
+    /// Cache intermediate tempfile name used in pushing via run_as.
+    pub tempfile: UnixPathBuf,
+}
+
+#[derive(Debug, Eq, PartialEq, Ord, PartialOrd)]
+pub struct RemoteDirEntry {
+    depth: usize,
+    metadata: RemoteMetadata,
+    name: String,
+}
+
+#[derive(Debug, Eq, PartialEq, Ord, PartialOrd)]
+pub enum RemoteMetadata {
+    RemoteFile(RemoteFileMetadata),
+    RemoteDir,
+    RemoteSymlink,
+}
+#[derive(Debug, Eq, PartialEq, Ord, PartialOrd)]
+pub struct RemoteFileMetadata {
+    mode: usize,
+    size: usize,
+}
+
+impl Device {
+    pub fn new(host: Host, serial: DeviceSerial, storage: AndroidStorageInput) -> Result<Device> {
+        let mut device = Device {
+            host,
+            serial,
+            adbd_root: false,
+            is_rooted: false,
+            run_as_package: None,
+            storage: AndroidStorage::App,
+            su_c_root: false,
+            su_0_root: false,
+            tempfile: UnixPathBuf::from("/data/local/tmp"),
+        };
+        device
+            .tempfile
+            .push(Uuid::new_v4().as_hyphenated().to_string());
+
+        // check for rooted devices
+        let uid_check = |id: String| id.contains("uid=0");
+        device.adbd_root = device
+            .execute_host_shell_command("id")
+            .map_or(false, uid_check);
+        device.su_0_root = device
+            .execute_host_shell_command("su 0 id")
+            .map_or(false, uid_check);
+        device.su_c_root = device
+            .execute_host_shell_command("su -c id")
+            .map_or(false, uid_check);
+        device.is_rooted = device.adbd_root || device.su_0_root || device.su_c_root;
+
+        device.storage = match storage {
+            AndroidStorageInput::App => AndroidStorage::App,
+            AndroidStorageInput::Internal => AndroidStorage::Internal,
+            AndroidStorageInput::Sdcard => AndroidStorage::Sdcard,
+            AndroidStorageInput::Auto => AndroidStorage::Sdcard,
+        };
+
+        if device.is_rooted {
+            info!("Device is rooted");
+
+            // Set Permissive=1 if we have root.
+            device.execute_host_shell_command("setenforce permissive")?;
+        } else {
+            info!("Device is unrooted");
+        }
+
+        Ok(device)
+    }
+
+    pub fn clear_app_data(&self, package: &str) -> Result<bool> {
+        self.execute_host_shell_command(&format!("pm clear {}", package))
+            .map(|v| v.contains("Success"))
+    }
+
+    pub fn create_dir(&self, path: &UnixPath) -> Result<()> {
+        debug!("Creating {}", path.display());
+
+        let enable_run_as = self.enable_run_as_for_path(path);
+        self.execute_host_shell_command_as(&format!("mkdir -p {}", path.display()), enable_run_as)?;
+
+        Ok(())
+    }
+
+    pub fn chmod(&self, path: &UnixPath, mask: &str, recursive: bool) -> Result<()> {
+        let enable_run_as = self.enable_run_as_for_path(path);
+
+        let recursive = match recursive {
+            true => " -R",
+            false => "",
+        };
+
+        self.execute_host_shell_command_as(
+            &format!("chmod {} {} {}", recursive, mask, path.display()),
+            enable_run_as,
+        )?;
+
+        Ok(())
+    }
+
+    pub fn execute_host_command(
+        &self,
+        command: &str,
+        has_output: bool,
+        has_length: bool,
+    ) -> Result<String> {
+        let mut stream = self.host.connect()?;
+
+        let switch_command = format!("host:transport:{}", self.serial);
+        trace!("execute_host_command: >> {:?}", &switch_command);
+        stream.write_all(encode_message(&switch_command)?.as_bytes())?;
+        let _bytes = read_response(&mut stream, false, false)?;
+        trace!("execute_host_command: << {:?}", _bytes);
+        // TODO: should we assert no bytes were read?
+
+        trace!("execute_host_command: >> {:?}", &command);
+        stream.write_all(encode_message(command)?.as_bytes())?;
+        let bytes = read_response(&mut stream, has_output, has_length)?;
+        let response = std::str::from_utf8(&bytes)?;
+        trace!("execute_host_command: << {:?}", response);
+
+        // Unify new lines by removing possible carriage returns
+        Ok(response.replace("\r\n", "\n"))
+    }
+
+    pub fn enable_run_as_for_path(&self, path: &UnixPath) -> bool {
+        match &self.run_as_package {
+            Some(package) => {
+                let mut p = UnixPathBuf::from("/data/data/");
+                p.push(package);
+                path.starts_with(p)
+            }
+            None => false,
+        }
+    }
+
+    pub fn execute_host_shell_command(&self, shell_command: &str) -> Result<String> {
+        self.execute_host_shell_command_as(shell_command, false)
+    }
+
+    pub fn execute_host_shell_command_as(
+        &self,
+        shell_command: &str,
+        enable_run_as: bool,
+    ) -> Result<String> {
+        // We don't want to duplicate su invocations.
+        if shell_command.starts_with("su") {
+            return self.execute_host_command(&format!("shell:{}", shell_command), true, false);
+        }
+
+        let has_outer_quotes = shell_command.starts_with('"') && shell_command.ends_with('"')
+            || shell_command.starts_with('\'') && shell_command.ends_with('\'');
+
+        if self.adbd_root {
+            return self.execute_host_command(&format!("shell:{}", shell_command), true, false);
+        }
+
+        if self.su_0_root {
+            return self.execute_host_command(
+                &format!("shell:su 0 {}", shell_command),
+                true,
+                false,
+            );
+        }
+
+        if self.su_c_root {
+            if has_outer_quotes {
+                return self.execute_host_command(
+                    &format!("shell:su -c {}", shell_command),
+                    true,
+                    false,
+                );
+            }
+
+            if SYNC_REGEX.is_match(shell_command) {
+                let arg: &str = &shell_command.replace('\'', "'\"'\"'")[..];
+                return self.execute_host_command(&format!("shell:su -c '{}'", arg), true, false);
+            }
+
+            return self.execute_host_command(
+                &format!("shell:su -c \"{}\"", shell_command),
+                true,
+                false,
+            );
+        }
+
+        // Execute command as package
+        if enable_run_as {
+            let run_as_package = self
+                .run_as_package
+                .as_ref()
+                .ok_or(DeviceError::MissingPackage)?;
+
+            if has_outer_quotes {
+                return self.execute_host_command(
+                    &format!("shell:run-as {} {}", run_as_package, shell_command),
+                    true,
+                    false,
+                );
+            }
+
+            if SYNC_REGEX.is_match(shell_command) {
+                let arg: &str = &shell_command.replace('\'', "'\"'\"'")[..];
+                return self.execute_host_command(
+                    &format!("shell:run-as {} {}", run_as_package, arg),
+                    true,
+                    false,
+                );
+            }
+
+            return self.execute_host_command(
+                &format!("shell:run-as {} \"{}\"", run_as_package, shell_command),
+                true,
+                false,
+            );
+        }
+
+        self.execute_host_command(&format!("shell:{}", shell_command), true, false)
+    }
+
+    pub fn is_app_installed(&self, package: &str) -> Result<bool> {
+        self.execute_host_shell_command(&format!("pm path {}", package))
+            .map(|v| v.contains("package:"))
+    }
+
+    pub fn launch<T: AsRef<str>>(
+        &self,
+        package: &str,
+        activity: &str,
+        am_start_args: &[T],
+    ) -> Result<bool> {
+        let mut am_start = format!("am start -W -n {}/{}", package, activity);
+
+        for arg in am_start_args {
+            am_start.push(' ');
+            if SYNC_REGEX.is_match(arg.as_ref()) {
+                am_start.push_str(&format!("\"{}\"", &shell::escape(arg.as_ref())));
+            } else {
+                am_start.push_str(&shell::escape(arg.as_ref()));
+            };
+        }
+
+        self.execute_host_shell_command(&am_start)
+            .map(|v| v.contains("Complete"))
+    }
+
+    pub fn force_stop(&self, package: &str) -> Result<()> {
+        debug!("Force stopping Android package: {}", package);
+        self.execute_host_shell_command(&format!("am force-stop {}", package))
+            .and(Ok(()))
+    }
+
+    pub fn forward_port(&self, local: u16, remote: u16) -> Result<u16> {
+        let command = format!(
+            "host-serial:{}:forward:tcp:{};tcp:{}",
+            self.serial, local, remote
+        );
+        let response = self.host.execute_command(&command, true, false)?;
+
+        if local == 0 {
+            Ok(response.parse::<u16>()?)
+        } else {
+            Ok(local)
+        }
+    }
+
+    pub fn kill_forward_port(&self, local: u16) -> Result<()> {
+        let command = format!("host-serial:{}:killforward:tcp:{}", self.serial, local);
+        self.execute_host_command(&command, true, false).and(Ok(()))
+    }
+
+    pub fn kill_forward_all_ports(&self) -> Result<()> {
+        let command = format!("host-serial:{}:killforward-all", self.serial);
+        self.execute_host_command(&command, false, false)
+            .and(Ok(()))
+    }
+
+    pub fn reverse_port(&self, remote: u16, local: u16) -> Result<u16> {
+        let command = format!("reverse:forward:tcp:{};tcp:{}", remote, local);
+        let response = self.execute_host_command(&command, true, false)?;
+
+        if remote == 0 {
+            Ok(response.parse::<u16>()?)
+        } else {
+            Ok(remote)
+        }
+    }
+
+    pub fn kill_reverse_port(&self, remote: u16) -> Result<()> {
+        let command = format!("reverse:killforward:tcp:{}", remote);
+        self.execute_host_command(&command, true, true).and(Ok(()))
+    }
+
+    pub fn kill_reverse_all_ports(&self) -> Result<()> {
+        let command = "reverse:killforward-all".to_owned();
+        self.execute_host_command(&command, false, false)
+            .and(Ok(()))
+    }
+
+    pub fn list_dir(&self, src: &UnixPath) -> Result<Vec<RemoteDirEntry>> {
+        let src = src.to_path_buf();
+        let mut queue = vec![(src.clone(), 0, "".to_string())];
+
+        let mut listings = Vec::new();
+
+        while let Some((next, depth, prefix)) = queue.pop() {
+            for listing in self.list_dir_flat(&next, depth, prefix)? {
+                if listing.metadata == RemoteMetadata::RemoteDir {
+                    let mut child = src.clone();
+                    child.push(listing.name.clone());
+                    queue.push((child, depth + 1, listing.name.clone()));
+                }
+
+                listings.push(listing);
+            }
+        }
+
+        Ok(listings)
+    }
+
+    fn list_dir_flat(
+        &self,
+        src: &UnixPath,
+        depth: usize,
+        prefix: String,
+    ) -> Result<Vec<RemoteDirEntry>> {
+        // Implement the ADB protocol to list a directory from the device.
+        let mut stream = self.host.connect()?;
+
+        // Send "host:transport" command with device serial
+        let message = encode_message(&format!("host:transport:{}", self.serial))?;
+        stream.write_all(message.as_bytes())?;
+        let _bytes = read_response(&mut stream, false, true)?;
+
+        // Send "sync:" command to initialize file transfer
+        let message = encode_message("sync:")?;
+        stream.write_all(message.as_bytes())?;
+        let _bytes = read_response(&mut stream, false, true)?;
+
+        // Send "LIST" command with name of the directory
+        stream.write_all(SyncCommand::List.code())?;
+        let args_ = format!("{}", src.display());
+        let args = args_.as_bytes();
+        write_length_little_endian(&mut stream, args.len())?;
+        stream.write_all(args)?;
+
+        // Use the maximum 64KB buffer to transfer the file contents.
+        let mut buf = [0; 64 * 1024];
+
+        let mut listings = Vec::new();
+
+        // Read "DENT" command one or more times for the directory entries
+        loop {
+            stream.read_exact(&mut buf[0..4])?;
+
+            if &buf[0..4] == SyncCommand::Dent.code() {
+                // From https://github.com/cstyan/adbDocumentation/blob/6d025b3e4af41be6f93d37f516a8ac7913688623/README.md:
+                //
+                // A four-byte integer representing file mode - first 9 bits of this mode represent
+                // the file permissions, as with chmod mode. Bits 14 to 16 seem to represent the
+                // file type, one of 0b100 (file), 0b010 (directory), 0b101 (symlink)
+                // A four-byte integer representing file size.
+                // A four-byte integer representing last modified time in seconds since Unix Epoch.
+                // A four-byte integer representing file name length.
+                // A utf-8 string representing the file name.
+                let mode = read_length_little_endian(&mut stream)?;
+                let size = read_length_little_endian(&mut stream)?;
+                let _time = read_length_little_endian(&mut stream)?;
+                let name_length = read_length_little_endian(&mut stream)?;
+                stream.read_exact(&mut buf[0..name_length])?;
+
+                let mut name = std::str::from_utf8(&buf[0..name_length])?.to_owned();
+
+                if name == "." || name == ".." {
+                    continue;
+                }
+
+                if !prefix.is_empty() {
+                    name = format!("{}/{}", prefix, &name);
+                }
+
+                let file_type = (mode >> 13) & 0b111;
+                let metadata = match file_type {
+                    0b010 => RemoteMetadata::RemoteDir,
+                    0b100 => RemoteMetadata::RemoteFile(RemoteFileMetadata {
+                        mode: mode & 0b111111111,
+                        size,
+                    }),
+                    0b101 => RemoteMetadata::RemoteSymlink,
+                    _ => return Err(DeviceError::Adb(format!("Invalid file mode {}", file_type))),
+                };
+
+                listings.push(RemoteDirEntry {
+                    name,
+                    depth,
+                    metadata,
+                });
+            } else if &buf[0..4] == SyncCommand::Done.code() {
+                // "DONE" command indicates end of file transfer
+                break;
+            } else if &buf[0..4] == SyncCommand::Fail.code() {
+                let n = buf.len().min(read_length_little_endian(&mut stream)?);
+
+                stream.read_exact(&mut buf[0..n])?;
+
+                let message = std::str::from_utf8(&buf[0..n])
+                    .map(|s| format!("adb error: {}", s))
+                    .unwrap_or_else(|_| "adb error was not utf-8".into());
+
+                return Err(DeviceError::Adb(message));
+            } else {
+                return Err(DeviceError::Adb("FAIL (unknown)".to_owned()));
+            }
+        }
+
+        Ok(listings)
+    }
+
+    pub fn path_exists(&self, path: &UnixPath, enable_run_as: bool) -> Result<bool> {
+        self.execute_host_shell_command_as(format!("ls {}", path.display()).as_str(), enable_run_as)
+            .map(|path| !path.contains("No such file or directory"))
+    }
+
+    pub fn pull(&self, src: &UnixPath, buffer: &mut dyn Write) -> Result<()> {
+        // Implement the ADB protocol to receive a file from the device.
+        let mut stream = self.host.connect()?;
+
+        // Send "host:transport" command with device serial
+        let message = encode_message(&format!("host:transport:{}", self.serial))?;
+        stream.write_all(message.as_bytes())?;
+        let _bytes = read_response(&mut stream, false, true)?;
+
+        // Send "sync:" command to initialize file transfer
+        let message = encode_message("sync:")?;
+        stream.write_all(message.as_bytes())?;
+        let _bytes = read_response(&mut stream, false, true)?;
+
+        // Send "RECV" command with name of the file
+        stream.write_all(SyncCommand::Recv.code())?;
+        let args_string = format!("{}", src.display());
+        let args = args_string.as_bytes();
+        write_length_little_endian(&mut stream, args.len())?;
+        stream.write_all(args)?;
+
+        // Use the maximum 64KB buffer to transfer the file contents.
+        let mut buf = [0; 64 * 1024];
+
+        // Read "DATA" command one or more times for the file content
+        loop {
+            stream.read_exact(&mut buf[0..4])?;
+
+            if &buf[0..4] == SyncCommand::Data.code() {
+                let len = read_length_little_endian(&mut stream)?;
+                stream.read_exact(&mut buf[0..len])?;
+                buffer.write_all(&buf[0..len])?;
+            } else if &buf[0..4] == SyncCommand::Done.code() {
+                // "DONE" command indicates end of file transfer
+                break;
+            } else if &buf[0..4] == SyncCommand::Fail.code() {
+                let n = buf.len().min(read_length_little_endian(&mut stream)?);
+
+                stream.read_exact(&mut buf[0..n])?;
+
+                let message = std::str::from_utf8(&buf[0..n])
+                    .map(|s| format!("adb error: {}", s))
+                    .unwrap_or_else(|_| "adb error was not utf-8".into());
+
+                return Err(DeviceError::Adb(message));
+            } else {
+                return Err(DeviceError::Adb("FAIL (unknown)".to_owned()));
+            }
+        }
+
+        Ok(())
+    }
+
+    pub fn pull_dir(&self, src: &UnixPath, dest_dir: &Path) -> Result<()> {
+        let src = src.to_path_buf();
+        let dest_dir = dest_dir.to_path_buf();
+
+        for entry in self.list_dir(&src)? {
+            match entry.metadata {
+                RemoteMetadata::RemoteSymlink => {} // Ignored.
+                RemoteMetadata::RemoteDir => {
+                    let mut d = dest_dir.clone();
+                    d.push(&entry.name);
+
+                    std::fs::create_dir_all(&d)?;
+                }
+                RemoteMetadata::RemoteFile(_) => {
+                    let mut s = src.clone();
+                    s.push(&entry.name);
+                    let mut d = dest_dir.clone();
+                    d.push(&entry.name);
+
+                    self.pull(&s, &mut File::create(d)?)?;
+                }
+            }
+        }
+
+        Ok(())
+    }
+
+    pub fn push(&self, buffer: &mut dyn Read, dest: &UnixPath, mode: u32) -> Result<()> {
+        // Implement the ADB protocol to send a file to the device.
+        // The protocol consists of the following steps:
+        // * Send "host:transport" command with device serial
+        // * Send "sync:" command to initialize file transfer
+        // * Send "SEND" command with name and mode of the file
+        // * Send "DATA" command one or more times for the file content
+        // * Send "DONE" command to indicate end of file transfer
+
+        let enable_run_as = self.enable_run_as_for_path(&dest.to_path_buf());
+        let dest1 = match enable_run_as {
+            true => self.tempfile.as_path(),
+            false => UnixPath::new(dest),
+        };
+
+        // If the destination directory does not exist, adb will
+        // create it and any necessary ancestors however it will not
+        // set the directory permissions to 0o777.  In addition,
+        // Android 9 (P) has a bug in its push implementation which
+        // will cause a push which creates directories to fail with
+        // the error `secure_mkdirs failed: Operation not
+        // permitted`. We can work around this by creating the
+        // destination directories prior to the push.  Collect the
+        // ancestors of the destination directory which do not yet
+        // exist so we can create them and adjust their permissions
+        // prior to performing the push.
+        let mut current = dest.parent();
+        let mut leaf: Option<&UnixPath> = None;
+        let mut root: Option<&UnixPath> = None;
+
+        while let Some(path) = current {
+            if self.path_exists(path, enable_run_as)? {
+                break;
+            }
+            if leaf.is_none() {
+                leaf = Some(path);
+            }
+            root = Some(path);
+            current = path.parent();
+        }
+
+        if let Some(path) = leaf {
+            self.create_dir(path)?;
+        }
+
+        if let Some(path) = root {
+            self.chmod(path, "777", true)?;
+        }
+
+        let mut stream = self.host.connect()?;
+
+        let message = encode_message(&format!("host:transport:{}", self.serial))?;
+        stream.write_all(message.as_bytes())?;
+        let _bytes = read_response(&mut stream, false, true)?;
+
+        let message = encode_message("sync:")?;
+        stream.write_all(message.as_bytes())?;
+        let _bytes = read_response(&mut stream, false, true)?;
+
+        stream.write_all(SyncCommand::Send.code())?;
+        let args_ = format!("{},{}", dest1.display(), mode);
+        let args = args_.as_bytes();
+        write_length_little_endian(&mut stream, args.len())?;
+        stream.write_all(args)?;
+
+        // Use a 32KB buffer to transfer the file contents
+        // TODO: Maybe adjust to maxdata (256KB)
+        let mut buf = [0; 32 * 1024];
+
+        loop {
+            let len = buffer.read(&mut buf)?;
+
+            if len == 0 {
+                break;
+            }
+
+            stream.write_all(SyncCommand::Data.code())?;
+            write_length_little_endian(&mut stream, len)?;
+            stream.write_all(&buf[0..len])?;
+        }
+
+        // https://android.googlesource.com/platform/system/core/+/master/adb/SYNC.TXT#66
+        //
+        // When the file is transferred a sync request "DONE" is sent, where length is set
+        // to the last modified time for the file. The server responds to this last
+        // request (but not to chunk requests) with an "OKAY" sync response (length can
+        // be ignored).
+        let time: u32 = ((SystemTime::now().duration_since(SystemTime::UNIX_EPOCH))
+            .unwrap()
+            .as_secs()
+            & 0xFFFF_FFFF) as u32;
+
+        stream.write_all(SyncCommand::Done.code())?;
+        write_length_little_endian(&mut stream, time as usize)?;
+
+        // Status.
+        stream.read_exact(&mut buf[0..4])?;
+
+        if buf.starts_with(SyncCommand::Okay.code()) {
+            if enable_run_as {
+                // Use cp -a to preserve the permissions set by push.
+                let result = self.execute_host_shell_command_as(
+                    format!("cp -aR {} {}", dest1.display(), dest.display()).as_str(),
+                    enable_run_as,
+                );
+                if self.remove(dest1).is_err() {
+                    warn!("Failed to remove {}", dest1.display());
+                }
+                result?;
+            }
+            Ok(())
+        } else if buf.starts_with(SyncCommand::Fail.code()) {
+            if enable_run_as && self.remove(dest1).is_err() {
+                warn!("Failed to remove {}", dest1.display());
+            }
+            let n = buf.len().min(read_length_little_endian(&mut stream)?);
+
+            stream.read_exact(&mut buf[0..n])?;
+
+            let message = std::str::from_utf8(&buf[0..n])
+                .map(|s| format!("adb error: {}", s))
+                .unwrap_or_else(|_| "adb error was not utf-8".into());
+
+            Err(DeviceError::Adb(message))
+        } else {
+            if self.remove(dest1).is_err() {
+                warn!("Failed to remove {}", dest1.display());
+            }
+            Err(DeviceError::Adb("FAIL (unknown)".to_owned()))
+        }
+    }
+
+    pub fn push_dir(&self, source: &Path, dest_dir: &UnixPath, mode: u32) -> Result<()> {
+        debug!("Pushing {} to {}", source.display(), dest_dir.display());
+
+        let walker = WalkDir::new(source).follow_links(false).into_iter();
+
+        for entry in walker {
+            let entry = entry?;
+            let path = entry.path();
+
+            if !entry.metadata()?.is_file() {
+                continue;
+            }
+
+            let mut file = File::open(path)?;
+
+            let tail = path
+                .strip_prefix(source)
+                .map_err(|e| io::Error::new(io::ErrorKind::Other, e.to_string()))?;
+
+            let dest = append_components(dest_dir, tail)?;
+            self.push(&mut file, &dest, mode)?;
+        }
+
+        Ok(())
+    }
+
+    pub fn remove(&self, path: &UnixPath) -> Result<()> {
+        debug!("Deleting {}", path.display());
+
+        self.execute_host_shell_command_as(
+            &format!("rm -rf {}", path.display()),
+            self.enable_run_as_for_path(path),
+        )?;
+
+        Ok(())
+    }
+}
+
+pub(crate) fn append_components(
+    base: &UnixPath,
+    tail: &Path,
+) -> std::result::Result<UnixPathBuf, io::Error> {
+    let mut buf = base.to_path_buf();
+
+    for component in tail.components() {
+        if let Component::Normal(segment) = component {
+            let utf8 = segment.to_str().ok_or_else(|| {
+                io::Error::new(
+                    io::ErrorKind::Other,
+                    "Could not represent path segment as UTF-8",
+                )
+            })?;
+            buf.push(utf8);
+        } else {
+            return Err(io::Error::new(
+                io::ErrorKind::Other,
+                "Unexpected path component".to_owned(),
+            ));
+        }
+    }
+
+    Ok(buf)
+}