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use std::process::{Command,Stdio};
use std::fs::OpenOptions;
use std::io::ErrorKind;
use thiserror::Error;
use anyhow::anyhow;
use which::which;
const CANNOT_FIND_BINARY_PATH_STR : &str = "external hashdeep binary cannot be found (is hashdeep installed?)";
#[derive(Error, Debug)]
pub enum RunHashdeepCommandError {
#[error("{}",CANNOT_FIND_BINARY_PATH_STR)]
CannotFindBinaryPath,
#[error("{0} exists (will not overwrite existing files)")]
OutputFileExists(String),
#[error("{0} and {1} exist (will not overwrite existing files)")]
OutputFilesExist(String, String),
#[error("\"{0}\" cannot be opened for writing (does the directory exist?)")]
OutputFileNotFound(String),
#[error("\"{0}\" cannot be opened for writing ({})", .1)]
OutputFileOtherError(String, #[source] std::io::Error),
#[error(transparent)]
Io(#[from] std::io::Error),
#[error(transparent)]
Other(#[from] anyhow::Error),
}
impl RunHashdeepCommandError {
fn new(e: std::io::Error, path: &str) -> Self {
match e.kind() {
ErrorKind::AlreadyExists => RunHashdeepCommandError::OutputFileExists(path.to_string()),
ErrorKind::NotFound => RunHashdeepCommandError::OutputFileNotFound(path.to_string()),
ErrorKind::Other => RunHashdeepCommandError::OutputFileOtherError(path.to_string(), e),
_ => e.into(),
}
}
}
pub fn run_hashdeep_command(
target_directory: &str,
output_path_base: &str,
hashdeep_command_name: &str,
) -> Result<(), RunHashdeepCommandError> {
match which(hashdeep_command_name) {
Err(which::Error::CannotFindBinaryPath) => return Err(RunHashdeepCommandError::CannotFindBinaryPath),
Err(x) => return Err(anyhow!(x).into()),
_ => ()
};
let error_log_suffix = ".errors";
let output_error_path = format!("{}{}", output_path_base, error_log_suffix);
let maybe_output_file =
OpenOptions::new().write(true).create_new(true).open(&output_path_base)
.map_err(|e| RunHashdeepCommandError::new(e, output_path_base));
let maybe_error_file =
OpenOptions::new().write(true).create_new(true).open(&output_error_path)
.map_err(|e| RunHashdeepCommandError::new(e, &output_error_path));
let (output_file, error_file) =
match (maybe_output_file, maybe_error_file) {
(Ok(output_file), Ok(error_file)) => (output_file, error_file),
(Err(output_file_error), Ok(_)) => {
std::fs::remove_file(&output_error_path)?;
return Err(output_file_error);
},
(Ok(_), Err(error_file_error)) => {
std::fs::remove_file(&output_path_base)?;
return Err(error_file_error);
},
(Err(output_file_error), Err(error_file_error)) => {
return Err(
if let ( RunHashdeepCommandError::OutputFileExists(file1),
RunHashdeepCommandError::OutputFileExists(file2) )
= (&output_file_error, &error_file_error)
{
RunHashdeepCommandError::OutputFilesExist(file1.clone(), file2.clone())
}
else {
output_file_error
}
);
}
};
Command::new(hashdeep_command_name)
.arg("-l")
.arg("-r")
.arg("-o").arg("f")
.arg(target_directory)
.stdin(Stdio::null())
.stdout(output_file)
.stderr(error_file)
.status()?;
Ok(())
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn run_hashdeep_command_missing_hashdeep_test() {
assert_eq!(CANNOT_FIND_BINARY_PATH_STR,
run_hashdeep_command("fake_target_dir",
"fake_output_path_base",
"nonexistent_program_name_Cmn2TMmwGO9U2j7")
.unwrap_err().to_string()
);
}
}