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use std::path::{Path, PathBuf};
use std::process::Command;
use std::str::FromStr;
use tempfile::{tempdir, TempDir};
const OBNAM_URL: &str = "https://gitlab.com/obnam/obnam.git";
const COMMIT_DIGITS: usize = 7;
#[derive(Debug, Clone)]
pub enum WhichObnam {
Installed,
Built(String),
}
impl FromStr for WhichObnam {
type Err = ObnamBuilderError;
fn from_str(s: &str) -> Result<Self, Self::Err> {
match s {
"installed" => Ok(WhichObnam::Installed),
_ => Ok(WhichObnam::Built(s.to_string())),
}
}
}
pub fn which_obnam(s: &str) -> Result<WhichObnam, ObnamBuilderError> {
WhichObnam::from_str(s)
}
#[derive(Debug, thiserror::Error)]
pub enum ObnamBuilderError {
#[error("don't understand which Obnam to use: {0}")]
Unknown(String),
#[error("failed to create temporary directory for building Obnam: {0}")]
TempDir(std::io::Error),
#[error("failed to run client binary {0}: {1}")]
Client(PathBuf, std::io::Error),
#[error("failed to run git: {0}")]
Git(std::io::Error),
#[error("failed to run cargo: {0}")]
Cargo(std::io::Error),
}
pub struct ObnamBuilder {
#[allow(dead_code)]
tempdir: TempDir,
client: PathBuf,
server: PathBuf,
commit: Option<String>,
}
impl ObnamBuilder {
pub fn new(which: &WhichObnam) -> Result<Self, ObnamBuilderError> {
let tempdir = tempdir().map_err(ObnamBuilderError::TempDir)?;
let builder = match which {
WhichObnam::Installed => Self {
tempdir,
client: Path::new("/usr/bin/obnam").to_path_buf(),
server: Path::new("/usr/bin/obnam-server").to_path_buf(),
commit: None,
},
WhichObnam::Built(commit) => {
let (commit, bin) = build_obnam(tempdir.path(), commit)?;
let client = bin.join("obnam");
let server = bin.join("obnam-server");
assert!(client.exists());
assert!(server.exists());
Self {
tempdir,
client,
server,
commit: Some(commit[..COMMIT_DIGITS].to_string()),
}
}
};
Ok(builder)
}
pub fn version(&self) -> Result<String, ObnamBuilderError> {
if let Some(commit) = &self.commit {
return Ok(commit.to_string());
}
let binary = self.client_binary();
let output = Command::new(binary)
.arg("--version")
.output()
.map_err(|err| ObnamBuilderError::Client(binary.to_path_buf(), err))?;
if output.status.code() != Some(0) {
eprintln!("{}", String::from_utf8_lossy(&output.stdout));
eprintln!("{}", String::from_utf8_lossy(&output.stderr));
std::process::exit(1);
}
let v = String::from_utf8_lossy(&output.stdout);
let v = v.strip_suffix('\n').or(Some(&v)).unwrap().to_string();
Ok(v)
}
pub fn client_binary(&self) -> &Path {
&self.client
}
pub fn server_binary(&self) -> &Path {
&self.server
}
}
fn build_obnam(dir: &Path, commit: &str) -> Result<(String, PathBuf), ObnamBuilderError> {
let src = dir.join("git");
let bin = dir.join("bin");
git_clone(OBNAM_URL, &src)?;
git_create_branch(&src, "build", commit)?;
let commit = git_resolve(&src, commit)?;
cargo_build(&src)?;
cargo_install(&src, dir)?;
Ok((commit, bin))
}
fn git_clone(url: &str, dir: &Path) -> Result<(), ObnamBuilderError> {
eprintln!("cloning {} to {}", url, dir.display());
run(
"git",
&["clone", url, &dir.display().to_string()],
Path::new("."),
)
.map_err(ObnamBuilderError::Git)
.map(|_| ())
}
fn git_create_branch(dir: &Path, branch: &str, commit: &str) -> Result<(), ObnamBuilderError> {
eprintln!("checking out {}", commit);
run("git", &["checkout", "-b", branch, commit], dir)
.map_err(ObnamBuilderError::Git)
.map(|_| ())
}
fn git_resolve(dir: &Path, commit: &str) -> Result<String, ObnamBuilderError> {
run("git", &["rev-parse", commit], dir)
.map(|s| s.strip_suffix('\n').or(Some("")).unwrap().to_string())
.map_err(ObnamBuilderError::Git)
}
fn cargo_build(dir: &Path) -> Result<(), ObnamBuilderError> {
eprintln!("building in {}", dir.display());
run("cargo", &["build", "--release"], dir)
.map_err(ObnamBuilderError::Git)
.map(|_| ())
}
fn cargo_install(src: &Path, bin: &Path) -> Result<(), ObnamBuilderError> {
eprintln!("install to {}", bin.display());
run(
"cargo",
&["install", "--path=.", "--root", &bin.display().to_string()],
src,
)
.map_err(ObnamBuilderError::Git)
.map(|_| ())
}
fn run(cmd: &str, args: &[&str], cwd: &Path) -> Result<String, std::io::Error> {
let output = Command::new(cmd).args(args).current_dir(cwd).output()?;
if output.status.code() != Some(0) {
eprintln!("{}", String::from_utf8_lossy(&output.stdout));
eprintln!("{}", String::from_utf8_lossy(&output.stderr));
std::process::exit(1);
}
let stdout = String::from_utf8_lossy(&output.stdout).to_string();
Ok(stdout)
}
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