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use crate::error::InternalError;
use std::process::Command;
use std::{
ffi::OsStr,
path::{Path, PathBuf},
};
pub struct PackageMetadata {
file_path: PathBuf,
metadata: String,
remove_modified: bool,
}
impl PackageMetadata {
pub fn try_new(file_path: &str) -> Result<Self, InternalError> {
let metadata = String::from_utf8(Self::get_module_metadata(file_path)?)?;
Ok(Self {
file_path: PathBuf::from(file_path),
metadata,
remove_modified: false,
})
}
fn metadata_contains_all(&self, patterns: &[&str]) -> Result<(), InternalError> {
for pattern in patterns {
if !&self.metadata.contains(pattern) {
let given_metadata_split: Vec<&str> = pattern.split(':').collect();
// Extract the expected meta data value for the given key
// For example Package name, Version etc.
let expected_metadata_split: Vec<&str> = self
.metadata
.split(&given_metadata_split[0])
.collect::<Vec<&str>>()[1]
.split('\n')
.collect::<Vec<&str>>()[0]
.split(':')
.collect();
return Err(InternalError::MetaDataMismatch {
package: self.file_path().to_string_lossy().to_string(),
expected_key: given_metadata_split[0].to_string(),
expected_value: expected_metadata_split[1].to_string(),
provided_value: given_metadata_split[1].to_string(),
});
}
}
Ok(())
}
fn get_module_metadata(file_path: &str) -> Result<Vec<u8>, InternalError> {
let res = Command::new("dpkg").arg("-I").arg(file_path).output()?;
match res.status.success() {
true => Ok(res.stdout),
false => Err(InternalError::ParsingError {
file: file_path.to_string(),
error: String::from_utf8_lossy(&res.stderr).to_string(),
}),
}
}
pub fn validate_package(&mut self, contain_args: &[&str]) -> Result<(), InternalError> {
self.metadata_contains_all(contain_args)?;
// In the current implementation using `apt-get` it is required that the file has '.deb' extension (if we use dpkg extension doesn't matter).
if self.file_path.extension() != Some(OsStr::new("deb")) {
let new_path = PathBuf::from(format!("{}.deb", self.file_path().to_string_lossy()));
let _res = std::os::unix::fs::symlink(self.file_path(), &new_path);
self.file_path = new_path;
self.remove_modified = true;
}
Ok(())
}
pub fn file_path(&self) -> &Path {
&self.file_path
}
}
impl Drop for PackageMetadata {
fn drop(&mut self) {
if self.remove_modified {
let _res = std::fs::remove_file(&self.file_path);
}
}
}
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