WIP: Add oxlog tool and library

This still needs a bit of work before it is ready to go.

Cargo.toml

@@ -20,6 +20,7 @@ members = [
     "dev-tools/crdb-seed",
     "dev-tools/omdb",
     "dev-tools/omicron-dev",
+    "dev-tools/oxlog",
     "dev-tools/thing-flinger",
     "dev-tools/xtask",
     "dns-server",
@@ -91,6 +92,7 @@ default-members = [
     "dev-tools/crdb-seed",
     "dev-tools/omdb",
     "dev-tools/omicron-dev",
+    "dev-tools/oxlog",
     "dev-tools/thing-flinger",
     # Do not include xtask in the list of default members, because this causes
     # hakari to not work as well and build times to be longer.

dev-tools/oxlog/Cargo.toml

@@ -0,0 +1,18 @@
+[package]
+name = "oxlog"
+version = "0.1.0"
+edition = "2021"
+license = "MPL-2.0"
+
+[dependencies]
+anyhow.workspace = true
+camino.workspace = true
+chrono.workspace = true
+clap.workspace = true
+uuid.workspace = true
+
+# Disable doc builds by default for our binaries to work around issue
+# rust-lang/cargo#8373.  These docs would not be very useful anyway.
+[[bin]]
+name = "oxlog"
+doc = false

dev-tools/oxlog/src/bin/oxlog.rs

@@ -0,0 +1,116 @@
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at https://mozilla.org/MPL/2.0/.
+
+//! Tool for discovering oxide related logfiles on sleds
+
+use clap::{Parser, Subcommand};
+use oxlog::{LogFile, Zones};
+
+#[derive(Debug, Parser)]
+#[command(version)]
+struct Cli {
+    #[command(subcommand)]
+    command: Commands,
+}
+
+#[derive(Debug, Subcommand)]
+enum Commands {
+    /// List all zones found on the filesystem
+    Zones,
+
+    /// List logs for a given service
+    Logs {
+        // The name of the zone
+        zone: String,
+
+        /// The name of the service to list logs for
+        service: Option<String>,
+
+        /// Print available metadata
+        #[arg(short, long)]
+        metadata: bool,
+
+        /// Print only the current log file
+        #[arg(short, long)]
+        current: bool,
+
+        /// Print only the archive log files
+        #[arg(short, long)]
+        archived: bool,
+
+        // Print only the extra log files
+        #[arg(short, long)]
+        extra: bool,
+    },
+}
+
+fn main() -> Result<(), anyhow::Error> {
+    let cli = Cli::parse();
+
+    match cli.command {
+        Commands::Zones => {
+            for zone in Zones::load()?.zones.keys() {
+                println!("{zone}");
+            }
+            Ok(())
+        }
+        Commands::Logs {
+            zone,
+            service,
+            metadata,
+            current,
+            archived,
+            extra,
+        } => {
+            let zones = Zones::load()?;
+            let print_metadata = |f: &LogFile| {
+                println!(
+                    "{}\t{}\t{}",
+                    f.path,
+                    f.size.map_or_else(|| "-".to_string(), |s| s.to_string()),
+                    f.modified
+                        .map_or_else(|| "-".to_string(), |s| s.to_rfc3339())
+                );
+            };
+
+            let logs = zones.zone_logs(&zone);
+            for (svc_name, mut svc_logs) in logs {
+                if let Some(service) = &service {
+                    if svc_name != service.as_str() {
+                        continue;
+                    }
+                }
+                svc_logs.archived.sort();
+                if current {
+                    if let Some(current) = &svc_logs.current {
+                        if metadata {
+                            print_metadata(current);
+                        } else {
+                            println!("{}", current.path);
+                        }
+                    }
+                }
+                if archived {
+                    for f in &svc_logs.archived {
+                        if metadata {
+                            print_metadata(f);
+                        } else {
+                            println!("{}", f.path);
+                        }
+                    }
+                }
+                if extra {
+                    for f in &svc_logs.extra {
+                        if metadata {
+                            print_metadata(f);
+                        } else {
+                            println!("{}", f.path);
+                        }
+                    }
+                }
+            }
+            Ok(())
+        }
+    }
+}