main.rs

mod app_manifest;
mod versioning;
use app_manifest::generate_app_menus;
use versioning::*;
mod utils;
use utils::*;
mod builder;
use builder::*;
mod verifier;
use std::env;

use verifier::*;

/// specifies the hardware target variant for the SoC
const PRECURSOR_SOC_VERSION: &str = "pvt";

/*
  Some notes on kernel versions versus backups.

  At v0.9.8-791, migrations from v1 PDDB were deprecated
  At v0.9.9-42, backups were introduced, with a backup header version of v1.0
  At v0.9.9-466, a bug parsing minor versions was fixed;
    now the minor version field of the backup header is actually compatible for restore
    header version is now v1.1

  The latest kernel can parse everything down to v0.9.8-791's backup.
  However, backups generated by the latest kernel require at least v0.9.9-466 to read it,
  due to the minor version masking bug.

  The MIN_XOUS_VERSION field is the oldest backup that a given kernel can parse.
  Backups older than this cannot be parsed because the migration code for that backup
  was deprecated. The main purpose of this field is to assist the restore script
  in selecting a kernel: it will automatically downgrade a kernel as far as it must
  read a very old backup. This tag is *not* useful for enforcing a minimum
  version of the kernel to read a very *new* backup.

  Instead, when picking a kernel to restore from, the latest kernel should always be picked,
  that is also able to parse the backup. In the case of developing a new breaking change
  on backups, the bleeding-edge directory must be added to the list of selectable URLs.
*/
const MIN_XOUS_VERSION: &str = "v0.9.8-791";

/// target triple for precursor builds
pub(crate) const TARGET_TRIPLE_RISCV32: &str = "riscv32imac-unknown-xous-elf";
pub(crate) const TARGET_TRIPLE_RISCV32_KERNEL: &str = "riscv32imac-unknown-none-elf";
/// target triple for ARM builds
pub(crate) const TARGET_TRIPLE_ARM: &str = "armv7a-unknown-xous-elf";
pub(crate) const TARGET_TRIPLE_ARM_KERNEL: &str = "armv7a-unknown-none-elf";

// because I have nowhere else to note this. The commit that contains the rkyv-enum derive
// refactor to work around warnings thrown by Rust 1.64.0 is: f815ed85b58b671178fbf53b4cea34186fc406eb
// We could undo this if it turns out to be a compiler regression.

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let mut builder = Builder::new();
    // encodes a timestamp into the build, unless '--no-timestamp' is passed
    let do_version = env::args().filter(|x| x == "--no-timestamp").count() == 0;
    generate_version(do_version);
    if do_version {
        builder.add_feature("timestamp");
    };

    // A base set of packages. This is all you need for a normal
    // operating system that can run libstd
    let base_pkgs = [
        "xous-ticktimer", // "well known" service: thread scheduling
        "xous-log",       // "well known" service: debug logging
        "xous-names",     // "well known" service: manage inter-server connection lookup
        "xous-susres",    // ticktimer registers with susres to coordinate time continuity across sleeps
    ]
    .to_vec();
    // minimal set of packages to do bare-iron graphical I/O
    let gfx_base_pkgs = [
        &base_pkgs[..],
        &[
            "graphics-server", // raw (unprotected) frame buffer primitives
            "early_settings",  // required by keyboard
            "keyboard",        // required by graphics-server
            "spinor",          // required by keyboard - to save key mapping
            "llio",            // required by spinor
        ],
    ]
    .concat();
    // packages in the user image - most of the services at this layer have cross-dependencies
    let user_pkgs = [
        &gfx_base_pkgs[..],
        &[
            // net services
            "com",
            "net",
            "dns",
            // UX abstractions
            "gam",
            "ime-frontend",
            "ime-plugin-shell",
            "codec",
            "modals",
            // security
            "root-keys",
            "trng",
            "sha2",
            // "engine-25519",
            "jtag",
            // GUI front end
            "status",
            "shellchat",
            // filesystem
            "pddb",
            // usb services
            "usb-device-xous",
        ],
    ]
    .concat();
    // for fast testing of compilation targets of the PDDB to real hardware
    let pddb_dev_pkgs = [&base_pkgs[..], &["pddb", "sha2"]].concat();
    // for fast checking of AES hardware accelerator
    let aes_test_pkgs = ["xous-ticktimer", "xous-log", "aes-test"].to_vec();

    // ---- extract position independent args ----
    let loader_key = get_flag("--lkey")?;
    if !loader_key.is_empty() {
        builder.loader_key_file(loader_key[0].to_string());
    }
    let kernel_key = get_flag("--kkey")?;
    if !kernel_key.is_empty() {
        builder.kernel_key_file(kernel_key[0].to_string());
    }
    let swap_key = get_flag("--swap")?;
    if swap_key.len() != 0 {
        let swap_parts: Vec<&str> = swap_key[0].split(':').collect();
        if swap_parts.len() != 2 {
            return Err(
                "Error: --swap argument should be of the form [offset]:[size] as hex numbers without 0x"
                    .into(),
            );
        }

        let offset = match u32::from_str_radix(swap_parts[0], 16) {
            Ok(o) => o,
            Err(e) => {
                return Err(format!(
                    "Error: offset should be hex number without 0x prefix {}: {:?}",
                    swap_parts[0], e
                )
                .into());
            }
        };

        let size = match u32::from_str_radix(swap_parts[1], 16) {
            Ok(o) => o,
            Err(e) => {
                return Err(format!(
                    "Error: offset should be hex number without 0x prefix {}: {:?}",
                    swap_parts[1], e
                )
                .into());
            }
        };

        builder.set_swap(offset, size);
    }

    let extra_apps = get_flag("--app")?;
    builder.add_apps(&extra_apps);
    let extra_services = get_flag("--service")?;
    builder.add_services(&extra_services);
    // extract features, and especially track language features
    let features = get_flag("--feature")?;
    let mut language_set = false;
    for feature in features {
        builder.add_feature(&feature);
        if feature.starts_with("xous/lang-") {
            track_language_changes(&feature)?;
            language_set = true;
        }
    }
    let kern_features = get_flag("--kernel-feature")?;
    for feature in kern_features {
        builder.add_kernel_feature(&feature);
    }

    if !language_set {
        // the default language is english
        track_language_changes("en")?;
    }
    let gdb_stub = env::args().filter(|x| x == "--gdb-stub").count() != 0;
    if gdb_stub {
        builder.add_kernel_feature("gdb-stub");
    }
    if env::args().filter(|x| x == "--debug-loader").count() != 0 {
        builder.add_loader_feature("debug-print");
    }
    if env::args().filter(|x| x == "--offline").count() != 0 {
        builder.add_global_flag("--offline");
    }
    if env::args().filter(|x| x == "--change-target").count() != 0 {
        builder.set_change_target_flag();
    }

    // manage an ugly patch we have to do to selectively configure AES for only cramium-soc targets
    match builder::search_in_file("services/aes/Cargo.toml", "default = []") {
        Ok(false) => {
            builder::search_and_replace_in_file(
                "services/aes/Cargo.toml",
                "default = [\"cramium-soc\"]",
                "default = []",
            )
            .expect("couldn't patch AES");

            match builder::search_in_file("services/aes/Cargo.toml", "default = []") {
                Ok(false) => {
                    return Err(
                        "Couldn't revert services/aes/Cargo.toml -- is the file writeable or corrupted?"
                            .into(),
                    );
                }
                _ => (),
            }
        }
        _ => {}
    }
    let mut broken_aes_cleanup = false;

    // ---- now process the verb plus position dependent arguments ----
    let mut args = env::args();
    let task = args.nth(1);
    match task.as_deref() {
        Some("install-toolkit") | Some("install-toolchain") => {
            let arg = env::args().nth(2);
            ensure_compiler(
                &Some(TARGET_TRIPLE_RISCV32),
                true,
                arg.map(|x| x == "--force").unwrap_or(false),
            )?;
            ensure_kernel_compiler(&Some(TARGET_TRIPLE_RISCV32_KERNEL), true)?;
        }
        // ----- renode configs --------
        Some("renode-image") => {
            builder.target_renode().add_services(&user_pkgs).add_apps(&get_cratespecs());
            builder.add_loader_feature("resume");
            // builder.add_loader_feature("debug-print");
        }
        Some("renode-image-debug") => {
            builder
                .target_renode()
                .add_loader_feature("resume")
                .add_services(&user_pkgs)
                .stream(BuildStream::Debug)
                .add_apps(&get_cratespecs());
        }
        Some("renode-test") => {
            builder.target_renode().add_services(&base_pkgs).add_services(&get_cratespecs());
        }
        Some("libstd-test") => {
            builder.target_renode().add_services(&base_pkgs).add_services(&get_cratespecs());
            builder.add_loader_feature("renode-bypass");
        }
        Some("libstd-net") => {
            builder.target_renode().add_services(&base_pkgs).add_services(&get_cratespecs());
            builder.add_loader_feature("renode-bypass").add_loader_feature("renode-minimal");
            builder
                .add_service("net", LoaderRegion::Ram)
                .add_service("com", LoaderRegion::Ram)
                .add_service("llio", LoaderRegion::Ram)
                .add_service("dns", LoaderRegion::Ram);
        }
        Some("renode-aes-test") => {
            builder.target_renode().add_services(&aes_test_pkgs).add_services(&get_cratespecs());
        }
        Some("ffi-test") => {
            builder.target_renode().add_services(&gfx_base_pkgs).add_services(&get_cratespecs());
            builder.add_service("ffi-test", LoaderRegion::Ram);
            builder.add_loader_feature("renode-bypass");
        }
        Some("renode-swap") => {
            let swap_pkgs = ["xous-ticktimer", "xous-log", "xous-susres"];
            if !builder.is_swap_set() {
                builder.set_swap(0x4020_0000, 4 * 1024 * 1024);
            }
            builder.target_renode();
            // builder.target_cramium_soc();
            builder.add_loader_feature("debug-print");
            builder.add_loader_feature("swap");
            builder.add_kernel_feature("swap");
            builder.add_feature("swap");
            builder.add_kernel_feature("debug-swap");
            // builder.add_kernel_feature("debug-swap-verbose");
            // builder.add_kernel_feature("debug-print");
            builder.add_loader_feature("resume");
            // It is important that this is the first service added, because the swapper *must* be in PID 2
            builder.add_service("xous-swapper", LoaderRegion::Flash);
            builder.add_kernel_feature("swap");

            for service in swap_pkgs {
                builder.add_service(service, LoaderRegion::Flash);
            }
            let swap_pkgs = [
                "xous-names",
                "trng",
                "graphics-server",
                "llio",
                "early_settings", // required by keyboard
                "spinor",
                "keyboard",
                "gam",
                "modals",
                "ime-plugin-shell",
                "ime-frontend",
                // "test-swapper",
                "cram-console",
            ]
            .to_vec();
            for service in swap_pkgs {
                builder.add_service(service, LoaderRegion::Swap);
            }

            builder.add_apps(get_cratespecs());
        }

        // ------- hosted mode configs -------
        Some("run") => {
            builder
                .target_hosted()
                .add_services(&user_pkgs)
                .add_feature("pddbtest")
                .add_feature("ditherpunk")
                .add_feature("tls")
                // .add_feature("test-rekey")
                .add_apps(&get_cratespecs());
        }
        Some("pddb-ci") => {
            builder
                .target_hosted()
                .add_services(&user_pkgs)
                .add_feature("pddb/ci")
                .add_feature("pddb/deterministic");
        }
        Some("pddb-btest") => {
            builder
                .target_hosted()
                .add_services(&user_pkgs)
                .add_feature("pddbtest")
                .add_feature("autobasis") // this will make secret basis tracking synthetic and automated for stress testing
                .add_feature("autobasis-ci")
                .add_feature("pddb/deterministic");
        }
        Some("hosted-debug") => {
            builder
                .target_hosted()
                .add_services(&user_pkgs)
                .add_feature("pddbtest")
                .add_feature("ditherpunk")
                .add_feature("tracking-alloc")
                .add_feature("tls")
                .stream(BuildStream::Debug)
                .add_apps(&get_cratespecs());
        }
        Some("gfx-dev") => {
            builder
                .target_hosted()
                .add_services(&gfx_base_pkgs)
                .add_services(&get_cratespecs())
                .add_feature("graphics-server/gfx-testing");
        }
        Some("hosted-ci") => {
            builder.target_hosted().add_services(&user_pkgs).hosted_build_only().add_apps(&get_cratespecs());
        }

        // ------ Precursor hardware image configs ------
        Some("app-image") => {
            builder
                .target_precursor(PRECURSOR_SOC_VERSION)
                .add_services(&user_pkgs)
                .add_feature("mass-storage") // add this in by default to help with testing
                .add_apps(&get_cratespecs());
        }
        Some("app-image-xip") => {
            builder
                .target_precursor(PRECURSOR_SOC_VERSION)
                //.add_services(&user_pkgs)
                .add_feature("mass-storage"); // add this in by default to help with testing
            for service in user_pkgs {
                if (service != "shellchat") && (service != "ime-plugin-shell" && (service != "net")) {
                    builder.add_service(service, LoaderRegion::Ram);
                } else {
                    builder.add_service(service, LoaderRegion::Flash);
                }
            }
            for app in get_cratespecs() {
                builder.add_app(&app, LoaderRegion::Flash);
            }
        }
        Some("perf-image") => {
            // `--feature vaultperf` will make `vault` the performance manager, in exclusion of shellchat
            if !builder.has_feature("shellperf") && !builder.has_feature("vaultperf") {
                // select `shellchat` as the performance manager by default.
                builder.add_feature("shellperf");
            }
            // note: to use this image, you need to load a version of the SOC that has the performance
            // counters built in. this can be generated using the command `python3
            // .\betrusted_soc.py -e .\dummy.nky --perfcounter` in the betrusted-soc repo.
            //
            // to read out performance monitoring data, use the `usb_update.py` script as follows:
            // ` python3 .\..\usb_update.py --dump v2p.txt --dump-file .\ring_aes_8.bin`
            // where the `v2p.txt` file contains a virtual to physical mapping that is generated by the
            // `perflib` framework and formatted in a fashion that can be automatically extracted
            // by the usb_update script.
            builder
                .target_precursor("c809403-perflib")
                .add_services(&user_pkgs)
                .add_apps(&get_cratespecs())
                .add_feature("perfcounter")
                .add_kernel_feature("v2p");
        }
        Some("dvt-image") => {
            // this image targets a mostly deprecated DVT hardware generation. The purpose of it is to re-use
            // some of the now-defunct hardware for eFuse code testing, especially since FPGAs
            // have gotten very scarce. Once the eFuse path is validated, we could remove this
            // target.
            let mut services: Vec<String> = user_pkgs.into_iter().map(String::from).collect();
            services.retain(|x| x != "codec"); // codec is not compatible with DVT boards

            builder
                .target_precursor("2753c12-dvt")
                .add_services(&services)
                .add_feature("no-codec")
                .add_feature("dvt")
                .add_apps(&get_cratespecs());
        }
        Some("tts") => {
            builder.target_precursor(PRECURSOR_SOC_VERSION);

            let mut pkgs = user_pkgs.to_vec();
            pkgs.push("tts-frontend");
            pkgs.push("ime-plugin-tts");
            pkgs.retain(|&pkg| pkg != "ime-plugin-shell");

            builder.add_services(&pkgs)
                .add_apps(&get_cratespecs())
                .add_service("espeak-embedded#https://ci.betrusted.io/job/espeak-embedded/lastSuccessfulBuild/artifact/target/riscv32imac-unknown-xous-elf/release/espeak-embedded",
                    LoaderRegion::Ram)
                .override_locale("en-tts")
                .add_feature("tts")
                .add_feature("braille");
        }
        Some("tiny") => {
            builder
                .target_precursor(PRECURSOR_SOC_VERSION)
                .add_services(&base_pkgs)
                .add_services(&get_cratespecs());
        }
        Some("usbdev") => {
            builder
                .target_precursor(PRECURSOR_SOC_VERSION)
                .add_services(&base_pkgs)
                .add_services(&get_cratespecs());
            //builder.add_service("usb-test");
            builder.add_service("usb-device-xous", LoaderRegion::Ram);
        }
        Some("pddb-dev") => {
            builder
                .target_precursor(PRECURSOR_SOC_VERSION)
                .add_services(&pddb_dev_pkgs)
                .add_services(&get_cratespecs());
        }
        Some("trng-test") => {
            builder
                .target_precursor(PRECURSOR_SOC_VERSION)
                .add_services(&user_pkgs)
                .add_feature("urandomtest");
        }
        Some("ro-test") => {
            builder
                .target_precursor(PRECURSOR_SOC_VERSION)
                .add_services(&user_pkgs)
                .add_feature("ringosctest");
        }
        Some("av-test") => {
            builder
                .target_precursor(PRECURSOR_SOC_VERSION)
                .add_services(&user_pkgs)
                .add_feature("avalanchetest");
        }
        Some("compile-apps") => {
            builder.target_precursor_no_image(PRECURSOR_SOC_VERSION).add_services(&gfx_base_pkgs);
        }

        // ------ Cramium hardware image configs ------
        Some("cramium-fpga") | Some("cramium-soc") => {
            // placement in flash is a tension between dev convenience and RAM usage. Things in flash
            // are resident, non-swapable, but end up making the slow kernel burn process take longer.
            let cramium_flash_pkgs = [
                "xous-ticktimer",
                "xous-log",
                "cram-hal-service",
                "xous-names",
                "graphics-server",
                "gam",
                "ime-plugin-shell",
                "ime-frontend",
            ]
            .to_vec();
            let cramium_swap_pkgs = ["modals", "cram-console", "usb-device-xous"].to_vec();
            // minimal config for USB debugging
            // let cramium_swap_pkgs = ["usb-device-xous"].to_vec(); // , "cram-console"
            if !builder.is_swap_set() {
                builder.set_swap(0, 4 * 1024 * 1024);
            }
            // builder.add_loader_feature("board-bringup");
            // builder.add_loader_feature("spim-test");
            // builder.add_loader_feature("spi-alt-channel"); // this flag, when asserted, uses the J_QSPI
            // builder.add_loader_feature("irq-test");
            // builder.add_loader_feature("usb-test");
            // builder.add_loader_feature("trng-test");
            // builder.add_loader_feature("dump-trng");
            // header. By default, we use JPC7_13 (J_QSPI does not work, for some reason; bit 3 is stuck
            // high...)
            builder.add_loader_feature("swap");
            builder.add_kernel_feature("swap");
            builder.add_feature("swap");

            builder.add_loader_feature("debug-print");
            builder.add_kernel_feature("debug-swap");
            // builder.add_kernel_feature("debug-print");
            // builder.add_kernel_feature("debug-swap-verbose");

            builder.add_feature("quantum-timer");
            // builder.add_feature("auto-trng"); // automatically initialize TRNG tester inside USB stack
            builder.add_kernel_feature("v2p");
            builder.add_feature("mass-storage");
            builder.add_feature("ditherpunk");
            match task.as_deref() {
                Some("cramium-fpga") => builder.target_cramium_fpga(),
                Some("cramium-soc") => builder.target_cramium_soc(),
                _ => panic!("should be unreachable"),
            };
            broken_aes_cleanup = true;

            // It is important that this is the first service added, because the swapper *must* be in PID 2
            builder.add_service("xous-swapper", LoaderRegion::Flash);

            for service in cramium_flash_pkgs {
                builder.add_service(service, LoaderRegion::Flash);
            }
            builder.add_services(&get_cratespecs());
            for service in cramium_swap_pkgs {
                builder.add_service(service, LoaderRegion::Swap);
            }
        }

        // ------ ARM hardware image configs ------
        Some("arm-tiny") => {
            builder
                .target_arm()
                .add_services([
                    "xous-log",
                    "xous-ticktimer",
                    "xous-names",
                    "ticktimer-test-client",
                ])
                .add_kernel_feature("v2p") // required to use LCD DMA with lcd-console
                .add_feature("atsama5d27")
                .add_feature("lcd-console")
                .add_services(&get_cratespecs())
                .stream(BuildStream::Release);
        }

        // ---- other single-purpose commands ----
        Some("generate-locales") => generate_locales()?,
        Some("wycheproof-import") => wycheproof_import()?,
        Some("dummy-template") => generate_app_menus(&Vec::new()),
        _ => print_help(),
    }
    builder.build()?;

    // AES is broken in the current rev of the Cramium SoC. This unpatches the crate so other builds can
    // work properly.
    if broken_aes_cleanup {
        builder::search_and_replace_in_file(
            "services/aes/Cargo.toml",
            "default = [\"cramium-soc\"]",
            "default = []",
        )
        .expect("couldn't patch AES");
    }
    match builder::search_in_file("services/aes/Cargo.toml", "default = []") {
        Ok(false) => {
            println!(
                "Build configuration is out of sync: cramium-soc patch on AES crate was not cleared out"
            );
            return Err("services/aes/Cargo.toml is in a bad state! Revert any patches to the file.".into());
        }
        _ => {}
    }
    // the intent of this call is to check that crates we are sourcing from crates.io
    // match the crates in our local source. The usual cause of an inconsistency is
    // a maintainer forgot to publish a change to crates.io.
    //
    // Note a key problem is that we don't check that the Cargo.toml files are correct,
    // because the manifest format is heavily modified on upload to crates.io.
    // This means that an attacker who controlls crates.io (or any part of the chain
    // from manifest upload to download) can freely modify dependencies, rendering
    // source code equivalence checking moot.
    //
    // this has to be called after the build because the crates need to be downloaded for
    // checking before you can check them!
    let do_verify = env::args().filter(|x| x == "--no-verify").count() == 0;
    if do_verify {
        match check_project_consistency() {
            Ok(()) => Ok(()),
            Err(e) => {
                // Explain to developers why this step is important.
                println!(
                    "Local source changes have not been published. If you meant to modify core components,"
                );
                println!(
                    "activate patches in top-level Cargo.toml to redirect crates.io to the local source tree."
                );
                println!("Otherwise, your local changes are IGNORED.");
                println!("Use the `--no-verify` argument to suppress this warning.");
                Err(e)
            }
        }
    } else {
        Ok(())
    }
}

fn print_help() {
    eprintln!(
"cargo xtask [verb] [cratespecs ..]
    [--feature [feature name]]
    [--lkey [loader key]] [--kkey [kernel key]]
    [--swap [offset:size]]
    [--app [cratespec]]
    [--service [cratespec]]
    [--no-timestamp]
    [--no-verify]
    [--gdb-stub]
    [--debug-loader]
    [--offline]
    [--change-target]

[cratespecs] is a list of 0 or more items of the following syntax:
   [name]                crate 'name' to be built from local source
   [name@version]        crate 'name' to be fetched from crates.io at the specified version
   [name#URL]            pre-built binary crate of 'name' downloaded from a server at 'URL'
   [path-to-binary]      file path to a prebuilt binary image on local machine.
                         Files in '.' must be specified as './file' to avoid confusion with local source
   [name:path-to-binary] file path to a prebuilt binary image on local machine which will be renamed.
                         This is useful if the binary image is an app since the name will be required
                         for registration with the gam.
                         Files in '.' must be specified as './file' to avoid confusion with local source

The [cratespecs] list is treated as apps or services based on the context of [verb]. Additional crates can
be merged in with explicit app/service treatment with the following flags:
 [--app] [cratespec]     [cratespec] is treated as an additional app
 [--service] [cratespec] [cratespec] is treated as an additional service

[--lkey] and [--kkey]    Paths to alternate private key files for loader and kernel key signing (defaults to developer key)
[--no-timestamp]         Do not include a timestamp in the build. By default, `ticktimer` is rebuilt on every run to encode a timestamp.
[--no-verify]            Do not verify that local sources match crates.io downloaded sources
[--gdb-stub]             Build the kernel with GDB support
[--debug-loader]         Enable debug printing in the loader
[--offline]              Avoid network traffic
[--swap offset:size]     Specify a region for swap memory. The behavior of this depends on the target.
[--change-target]        Used to clean the cached target/*/*/build/SVD_PATH when changing build targets.
                         This will also force a full rebuild every time the flag is specified.

- An 'app' must be enumerated in apps/manifest.json.
   A pre-processor configures the launch menu based on the list of specified apps.
- A 'service' is merged into the device image without any pre-processing.

[verb] options:
Hardware images:
 app-image-xip           Precursor user image with XIP (frees more RAM for apps). [cratespecs] are apps
 app-image               Precursor user image (all services in RAM). [cratespecs] are apps
 perf-image              Precursor user image, with performance profiling. [cratespecs] are apps
 tts                     builds an image with text to speech support via externally linked C executable. [cratespecs] are apps
 usbdev                  minimal, insecure build for new USB core bring-up. [cratespecs] are services
 trng-test               automation framework for TRNG testing (CPRNG seeded by RO^AV). [cratespecs] ignored.
 ro-test                 automation framework for TRNG testing (RO directly, no CPRNG). [cratespecs] ignored.
 av-test                 automation framework for TRNG testing (AV directly, no CPRNG). [cratespecs] ignored.
 tiny                    Precursor tiny image. For testing with services built out-of-tree.

Hosted emulation:
 run                     Run user image in hosted mode with release flags. [cratespecs] are apps
 pddb-ci                 PDDB config for CI testing (eg: TRNG->deterministic for reproducible errors). [cratespecs] ignored.
 pddb-btest              PDDB stress tester for secret basis creation/deletion [cratespecs] ignored.
 hosted-debug            Run user image in hosted mode with debug flags. [cratespecs] are apps
 gfx-dev                 Testing mode for graphics primitives. [cratespecs] are services
 pddb-dev                Testing for compilation errors on hardware targets on the PDDB.

Renode emulation:
 renode-image            Renode user image. Unspecified [cratespecs] are apps
 renode-test             Renode test image. Unspecified [cratespecs] are services
 renode-image-debug      Renode user image with --debug flag set
 libstd-test             Renode test image that includes the minimum packages. [cratespecs] are services
                         Bypasses sig checks, keys locked out.
 libstd-net              Renode test image for testing network functions. Bypasses sig checks, keys locked out.
 ffi-test                builds an image for testing C-FFI bindings and integration. [cratespecs] are services
 renode-aes-test         Renode image for AES emulation development. Extremely minimal.

Other commands:
 generate-locales        (re)generate the locales include for the language selected in locales/src/locale.rs
 wycheproof-import       generate binary test vectors for engine-25519 from whycheproof-import/x25519.json
 install-toolkit         installs Xous toolkit with no prompt, useful in CI. Specify `--force` to remove existing toolchains
 compile-apps            Just compiles the apps specified in [cratespecs], for example in order to use app server
 dummy-template          Generate dummy templates for formatting and checking purposes

Note: By default, the `ticktimer` will get rebuilt every time. You can skip this by appending `--no-timestamp` to the command.
"
    )
}

type DynError = Box<dyn std::error::Error>;

/// [cratespecs] are positional arguments, and is a list of 0 to N tokens that immediately
/// follow [verb]
fn get_cratespecs() -> Vec<String> {
    let mut cratespecs = Vec::<String>::new();
    let mut args = env::args();
    args.nth(1); // skip the verb
    for arg in args {
        if arg.starts_with('-') {
            // stop processing the list as soon as first named argument is found
            break;
        }
        cratespecs.push(arg)
    }
    cratespecs
}

fn get_flag(flag: &str) -> Result<Vec<String>, DynError> {
    let mut list = Vec::<String>::new();
    let args = env::args();
    let mut flag_found = false;
    for arg in args {
        if arg == flag {
            flag_found = true;
            continue;
        }
        if flag_found {
            if arg.starts_with('-') {
                eprintln!("Malformed arguments. Expected argument after flag {}, but found {}", flag, arg);
                return Err("Bad arguments".into());
            }
            list.push(arg);
            flag_found = false;
            continue;
        }
    }
    Ok(list)
}