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From: Aaron Lauterer <a.lauterer@proxmox.com>
To: pve-devel@lists.proxmox.com
Date: Thu, 4 Apr 2024 16:48:47 +0200
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Subject: [pve-devel] [PATCH installer v4 15/30] auto-installer: add fetch
answer binary
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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@proxmox.com>
---
Makefile | 4 +-
.../src/bin/proxmox-fetch-answer.rs | 71 ++++++++++++++++
.../src/fetch_plugins/mod.rs | 2 +
.../src/fetch_plugins/partition.rs | 32 ++++++++
.../src/fetch_plugins/utils.rs | 81 +++++++++++++++++++
proxmox-auto-installer/src/lib.rs | 1 +
6 files changed, 190 insertions(+), 1 deletion(-)
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
create mode 100644 proxmox-auto-installer/src/fetch_plugins/utils.rs
diff --git a/Makefile b/Makefile
index 3ac5769..e44450e 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 := \
@@ -121,7 +122,8 @@ $(COMPILED_BINS): cargo-build
.PHONY: cargo-build
cargo-build:
$(CARGO) build --package proxmox-tui-installer --bin proxmox-tui-installer \
- --package proxmox-auto-installer --bin proxmox-auto-installer $(CARGO_BUILD_ARGS)
+ --package proxmox-auto-installer --bin proxmox-auto-installer \
+ --bin proxmox-fetch-answer $(CARGO_BUILD_ARGS)
%-banner.png: %-banner.svg
rsvg-convert -o $@ $<
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..a3681a2
--- /dev/null
+++ b/proxmox-auto-installer/src/bin/proxmox-fetch-answer.rs
@@ -0,0 +1,71 @@
+use anyhow::{anyhow, Error, Result};
+use log::{error, info, LevelFilter};
+use proxmox_auto_installer::{fetch_plugins::partition::FetchFromPartition, 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> {
+ 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, ...
+
+ Err(Error::msg("Could not find any answer file!"))
+}
+
+fn main() -> ExitCode {
+ if let Err(err) = init_log() {
+ panic!("could not initialize 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("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..11d6937
--- /dev/null
+++ b/proxmox-auto-installer/src/fetch_plugins/mod.rs
@@ -0,0 +1,2 @@
+pub mod partition;
+mod utils;
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..0c47a62
--- /dev/null
+++ b/proxmox-auto-installer/src/fetch_plugins/partition.rs
@@ -0,0 +1,32 @@
+use anyhow::{Error, Result};
+use std::{fs::read_to_string, path::Path};
+use log::info;
+
+use crate::fetch_plugins::utils::mount_proxmoxinst_part;
+
+static ANSWER_FILE: &str = "answer.toml";
+
+pub struct FetchFromPartition;
+
+impl FetchFromPartition {
+ /// Returns the contents of the answer file
+ pub fn get_answer() -> Result<String> {
+ info!("Checking for answer file on partition.");
+ let mount_path = mount_proxmoxinst_part()?;
+ let answer = Self::get_answer_file(&mount_path)?;
+ info!("Found answer file on partition.");
+ Ok(answer)
+ }
+
+ /// Searches for answer file and returns contents if found
+ fn get_answer_file(mount_path: &str) -> Result<String> {
+ let answer_path = Path::new(mount_path).join(ANSWER_FILE);
+ match answer_path.try_exists() {
+ Ok(true) => Ok(read_to_string(answer_path)?),
+ _ => Err(Error::msg(format!(
+ "could not find answer file expected at: {}",
+ answer_path.display()
+ ))),
+ }
+ }
+}
diff --git a/proxmox-auto-installer/src/fetch_plugins/utils.rs b/proxmox-auto-installer/src/fetch_plugins/utils.rs
new file mode 100644
index 0000000..f2a8e74
--- /dev/null
+++ b/proxmox-auto-installer/src/fetch_plugins/utils.rs
@@ -0,0 +1,81 @@
+use anyhow::{bail, Error, Result};
+use log::{info, warn};
+use std::{
+ fs::{self, create_dir_all},
+ path::{Path, PathBuf},
+ process::Command,
+};
+
+static ANSWER_MP: &str = "/mnt/answer";
+static PARTLABEL: &str = "proxmoxinst";
+static SEARCH_PATH: &str = "/dev/disk/by-label";
+
+/// Searches for upper and lower case existence of the partlabel in the search_path
+///
+/// # Arguemnts
+/// * `partlabel_source` - Partition Label, used as upper and lower case
+/// * `search_path` - Path where to search for the partiiton label
+pub fn scan_partlabels(partlabel_source: &str, search_path: &str) -> Result<PathBuf> {
+ let partlabel = partlabel_source.to_uppercase();
+ let path = Path::new(search_path).join(&partlabel);
+ 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_source.to_lowercase();
+ let path = Path::new(search_path).join(&partlabel);
+ 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_source}'");
+}
+
+/// Will search and mount a partition/FS labeled proxmoxinst in lower or uppercase to ANSWER_MP;
+pub fn mount_proxmoxinst_part() -> Result<String> {
+ if let Ok(true) = check_if_mounted(ANSWER_MP) {
+ info!("Skipping: '{ANSWER_MP}' is already mounted.");
+ return Ok(ANSWER_MP.into());
+ }
+ let part_path = scan_partlabels(PARTLABEL, SEARCH_PATH)?;
+ info!("Mounting partition at {ANSWER_MP}");
+ // create dir for mountpoint
+ create_dir_all(ANSWER_MP)?;
+ match Command::new("mount")
+ .args(["-o", "ro"])
+ .arg(part_path)
+ .arg(ANSWER_MP)
+ .output()
+ {
+ Ok(output) => {
+ if output.status.success() {
+ Ok(ANSWER_MP.into())
+ } else {
+ warn!("Error mounting: {}", String::from_utf8(output.stderr)?);
+ Ok(ANSWER_MP.into())
+ }
+ }
+ Err(err) => Err(Error::msg(format!("Error mounting: {err}"))),
+ }
+}
+
+fn check_if_mounted(target_path: &str) -> Result<bool> {
+ let mounts = fs::read_to_string("/proc/mounts")?;
+ for line in mounts.lines() {
+ if let Some(mp) = line.split(' ').nth(1) {
+ if mp == target_path {
+ return Ok(true);
+ }
+ }
+ }
+ Ok(false)
+}
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