[pve-devel] [PATCH v1 installer 14/18] auto-installer: add fetch answer binary
Aaron Lauterer
a.lauterer at proxmox.com
Tue Jan 23 18:00:49 CET 2024
it is supposed to be run first and fetch an answer file.
The initial implementation searches for a partition/filesystem called
'proxmoxinst' or 'PROXMOXINST' with an 'answer.toml' file in the root
directory.
Once it has an answer file, it will call the 'proxmox-auto-installer'
and pipe in the contents via stdin.
Signed-off-by: Aaron Lauterer <a.lauterer at proxmox.com>
---
Makefile | 1 +
.../src/bin/proxmox-fetch-answer.rs | 73 +++++++++++++
.../src/fetch_plugins/mod.rs | 1 +
.../src/fetch_plugins/partition.rs | 102 ++++++++++++++++++
proxmox-auto-installer/src/lib.rs | 1 +
5 files changed, 178 insertions(+)
create mode 100644 proxmox-auto-installer/src/bin/proxmox-fetch-answer.rs
create mode 100644 proxmox-auto-installer/src/fetch_plugins/mod.rs
create mode 100644 proxmox-auto-installer/src/fetch_plugins/partition.rs
diff --git a/Makefile b/Makefile
index 9c933d9..b724789 100644
--- a/Makefile
+++ b/Makefile
@@ -20,6 +20,7 @@ PREFIX = /usr
BINDIR = $(PREFIX)/bin
USR_BIN := \
proxmox-tui-installer\
+ proxmox-fetch-answer\
proxmox-auto-installer
COMPILED_BINS := \
diff --git a/proxmox-auto-installer/src/bin/proxmox-fetch-answer.rs b/proxmox-auto-installer/src/bin/proxmox-fetch-answer.rs
new file mode 100644
index 0000000..baf2bd2
--- /dev/null
+++ b/proxmox-auto-installer/src/bin/proxmox-fetch-answer.rs
@@ -0,0 +1,73 @@
+use anyhow::{anyhow, bail, Result};
+use log::{error, info, LevelFilter};
+use proxmox_auto_installer::fetch_plugins::partition::FetchFromPartition;
+use proxmox_auto_installer::log::AutoInstLogger;
+use std::io::Write;
+use std::process::{Command, ExitCode, Stdio};
+
+static LOGGER: AutoInstLogger = AutoInstLogger;
+
+pub fn init_log() -> Result<()> {
+ AutoInstLogger::init("/tmp/fetch_answer.log")?;
+ log::set_logger(&LOGGER)
+ .map(|()| log::set_max_level(LevelFilter::Info))
+ .map_err(|err| anyhow!(err))
+}
+
+fn fetch_answer() -> Result<String> {
+ info!("Checking for partition");
+ match FetchFromPartition::get_answer() {
+ Ok(answer) => return Ok(answer),
+ Err(err) => info!("Fetching answer file from partition failed: {}", err),
+ }
+ // TODO: add more options to get an answer file, e.g. download from url where url could be
+ // fetched via txt records on predefined subdomain, kernel param, dhcp option, ...
+
+ bail!("Could not find any answer file!")
+}
+
+fn main() -> ExitCode {
+ if let Err(err) = init_log() {
+ panic!("could not initilize logging: {err}");
+ }
+
+ info!("Fetching answer file");
+ let answer = match fetch_answer() {
+ Ok(answer) => answer,
+ Err(err) => {
+ error!("Aborting: {}", err);
+ return ExitCode::FAILURE;
+ }
+ };
+
+ let mut child = match Command::new("/usr/bin/proxmox-auto-installer")
+ .stdout(Stdio::inherit())
+ .stdin(Stdio::piped())
+ .stderr(Stdio::null())
+ .spawn()
+ {
+ Ok(child) => child,
+ Err(err) => panic!("Failed to start automatic installation: {}", err),
+ };
+
+ let mut stdin = child.stdin.take().expect("Failed to open stdin");
+ std::thread::spawn(move || {
+ stdin
+ .write_all(answer.as_bytes())
+ .expect("Failed to write to stdin");
+ });
+
+ match child.wait() {
+ Ok(status) => {
+ if status.success() {
+ ExitCode::SUCCESS
+ } else {
+ ExitCode::FAILURE // Will be trapped
+ }
+ }
+ Err(err) => {
+ error!("Auto installer exited: {err}");
+ ExitCode::FAILURE
+ }
+ }
+}
diff --git a/proxmox-auto-installer/src/fetch_plugins/mod.rs b/proxmox-auto-installer/src/fetch_plugins/mod.rs
new file mode 100644
index 0000000..44399e6
--- /dev/null
+++ b/proxmox-auto-installer/src/fetch_plugins/mod.rs
@@ -0,0 +1 @@
+pub mod partition;
diff --git a/proxmox-auto-installer/src/fetch_plugins/partition.rs b/proxmox-auto-installer/src/fetch_plugins/partition.rs
new file mode 100644
index 0000000..0552ddd
--- /dev/null
+++ b/proxmox-auto-installer/src/fetch_plugins/partition.rs
@@ -0,0 +1,102 @@
+use anyhow::{bail, Result};
+use log::{info, warn};
+use std::fs::read_to_string;
+use std::path::{Path, PathBuf};
+use std::process::Command;
+
+static ANSWER_FILE: &str = "answer.toml";
+static ANSWER_MP: &str = "/mnt/answer";
+static PARTLABEL: &str = "proxmoxinst";
+static SEARCH_PATH: &str = "/dev/disk/by-label";
+
+pub struct FetchFromPartition;
+
+impl FetchFromPartition {
+ /// Returns the contents of the answer file
+ pub fn get_answer() -> Result<String> {
+ let part_path = Self::scan_partlabels()?;
+ Self::mount_part(part_path)?;
+ Self::get_answer_file()
+ }
+
+ /// Searches for upper and lower case existence of the PARTLABEL in the SEARCH_PATH
+ fn scan_partlabels() -> Result<PathBuf> {
+ let partlabel = PARTLABEL.to_uppercase();
+ let path = Path::new(SEARCH_PATH).join(partlabel.clone());
+ match path.try_exists() {
+ Ok(true) => {
+ info!("Found partition with label '{}'", partlabel);
+ return Ok(path);
+ }
+ Ok(false) => info!("Did not detect partition with label '{}'", partlabel),
+ Err(err) => info!("Encountered issue, accessing '{}': {}", path.display(), err),
+ }
+
+ let partlabel = PARTLABEL.to_lowercase();
+ let path = Path::new(SEARCH_PATH).join(partlabel.clone());
+ match path.try_exists() {
+ Ok(true) => {
+ info!("Found partition with label '{}'", partlabel);
+ return Ok(path);
+ }
+ Ok(false) => info!("Did not detect partition with label '{}'", partlabel),
+ Err(err) => info!("Encountered issue, accessing '{}': {}", path.display(), err),
+ }
+ bail!(
+ "Could not detect upper or lower case labels for '{}'",
+ PARTLABEL
+ );
+ }
+
+ /// Will mount source path to ANSWER_MP
+ ///
+ /// # Arguments
+ ///
+ /// * `source` - `PathBuf` of the source location
+ fn mount_part(source: PathBuf) -> Result<()> {
+ info!("Mounting partition at {ANSWER_MP}");
+ // create dir for mountpoint
+ match Command::new("/usr/bin/mkdir")
+ .arg(ANSWER_MP)
+ .arg("-p")
+ .output()
+ {
+ Ok(output) => {
+ if !output.status.success() {
+ warn!(
+ "Error creating mount path: {}",
+ String::from_utf8(output.stderr)?
+ )
+ }
+ }
+ Err(err) => bail!("Error creating mount path: {}", err),
+ }
+ match Command::new("/usr/bin/mount")
+ .arg(source)
+ .arg(ANSWER_MP)
+ .output()
+ {
+ Ok(output) => {
+ if output.status.success() {
+ Ok(())
+ } else {
+ warn!("Error mounting: {}", String::from_utf8(output.stderr)?);
+ Ok(())
+ }
+ }
+ Err(err) => bail!("Error mounting: {}", err),
+ }
+ }
+
+ /// Searches for answer file and returns contents if found
+ fn get_answer_file() -> Result<String> {
+ let answer_path = Path::new(ANSWER_MP).join(ANSWER_FILE);
+ match answer_path.try_exists() {
+ Ok(true) => Ok(read_to_string(answer_path)?),
+ _ => bail!(
+ "could not find answer file expected at: {}",
+ answer_path.display()
+ ),
+ }
+ }
+}
diff --git a/proxmox-auto-installer/src/lib.rs b/proxmox-auto-installer/src/lib.rs
index 6636cc7..0a153b2 100644
--- a/proxmox-auto-installer/src/lib.rs
+++ b/proxmox-auto-installer/src/lib.rs
@@ -1,4 +1,5 @@
pub mod answer;
+pub mod fetch_plugins;
pub mod log;
pub mod udevinfo;
pub mod utils;
--
2.39.2
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