Add cargo deny init argument. (#48)

resources/template.toml

@@ -0,0 +1,48 @@
+[licenses]
+# This section is considered when running `cargo deny check license`
+# More documentation for the licenses section can be found here:
+# https://github.com/EmbarkStudios/cargo-deny#the-licenses-section
+
+# Uncomment the following line to change the lint level for unlicensed crates [possible values: "deny", "allow" or "warn"].
+#unlicensed = "deny"
+
+# Uncomment the following line to explictly allow certain licenses [possible values: any SPDX 2.1 identifier].
+#allow = []
+
+# Uncomment the following line to explictly disallow certain licenses [possible values: any SPDX 2.1 identifier].
+#deny = []
+
+# Uncomment the following line to change the lint level for licenses considered copyleft [possible values: "deny", "allow" or "warn"].
+#copyleft = "warn"
+
+# Uncomment the following line to approve or deny OSI-approved or FSF Free/Libre licenses [possible values: "both", "either", "osi-only", "fsf-only" or "neither"].
+#allow-osi-fsf-free = "neither"
+
+# Uncomment the following line to change the confidence threshold. [possible values: any between 0.0 and 1.0].
+# The higher the value, the more closely the license text must be to the canonical license text of a valid SPDX license file.
+#confidence-threshold = 0.8
+
+[bans]
+# This section is considered when running `cargo deny check ban`.
+# More documentation about the 'bans' section can be found here:
+# https://github.com/EmbarkStudios/cargo-deny#crate-bans-cargo-deny-check-ban
+
+# Uncomment the following line to change what happens when multiple versions of the same crate are encountered [possible values: "deny", "warn" or "allow"].
+#multiple-versions = "warn"
+
+# Uncomment the following line to change the highlighting variant used to  multiple versions of the same crate when creating
+# a dotgraph of your crates dependencies [possible values: "lowest-version", "simplest-path" or "all"].
+#highlight = "all"
+
+# Uncomment the following line to allow specific crates.
+#allow = []
+
+# Uncomment the following line to deny specific crates.
+#deny = []
+
+# Uncomment the following line to skip specific crates.
+#skip = []
+
+# Uncomment the following line to skip specific crates (including different versions of the same crate down the dependency
+# tree). By default, the depth is infinite. If however desired, the depth can be ajusted.
+#skip-tree = []

src/cargo-deny/check.rs

@@ -6,6 +6,8 @@ use serde::Deserialize;
 use std::path::{Path, PathBuf};
 use structopt::StructOpt;
 
+use crate::common::make_absolute_path;
+
 arg_enum! {
     #[derive(Debug, PartialEq)]
     pub enum WhichCheck {
@@ -87,14 +89,8 @@ pub fn cmd(
 ) -> Result<(), Error> {
     let cfg_path = args
         .config
-        .or_else(|| Some("deny.toml".to_owned().into()))
-        .map(|p| {
-            if p.is_absolute() {
-                p
-            } else {
-                context_dir.join(p)
-            }
-        })
+        .or_else(|| Some("deny.toml".into()))
+        .map(|p| make_absolute_path(p, context_dir))
         .context("unable to determine config path")?;
 
     let mut files = codespan::Files::new();

src/cargo-deny/common.rs

@@ -1,4 +1,5 @@
 use clap::arg_enum;
+use std::path::PathBuf;
 
 arg_enum! {
     #[derive(Copy, Clone, Debug)]
@@ -7,3 +8,11 @@ arg_enum! {
         Json,
     }
 }
+
+pub(crate) fn make_absolute_path(path: PathBuf, context_dir: PathBuf) -> PathBuf {
+    if path.is_absolute() {
+        path
+    } else {
+        context_dir.join(path)
+    }
+}

src/cargo-deny/init.rs

@@ -0,0 +1,41 @@
+use anyhow::{ensure, Context, Error};
+use std::path::PathBuf;
+use structopt::StructOpt;
+
+use crate::common::make_absolute_path;
+
+#[derive(StructOpt, Debug, Clone)]
+pub struct Args {
+    /// The path to the config file. Defaults to <context>/deny.toml
+    #[structopt(short, long, parse(from_os_str))]
+    config: Option<PathBuf>,
+}
+
+const DENY_TOML: &str = "deny.toml";
+const CONTENTS: &[u8] = include_bytes!("../../resources/template.toml");
+
+pub fn cmd(args: Args, context_dir: PathBuf) -> Result<(), Error> {
+    let cfg_file = args
+        .config
+        .clone()
+        .or_else(|| Some(DENY_TOML.into()))
+        .map(|path| make_absolute_path(path, context_dir))
+        .context("unable to determine config path")?;
+
+    // make sure the file does not exist yet
+    ensure!(
+        std::fs::metadata(&cfg_file).is_err(),
+        "unable to initialize cargo deny config file ; the provided path already exists"
+    );
+    // make sure the path does not terminate in '..'; we need a file name.
+    ensure!(
+        &cfg_file.file_name().is_some(),
+        "unable to create a config file with the given name ; the given file path is not valid"
+    );
+
+    log::info!("saving config file to: {}", &cfg_file.display());
+
+    std::fs::write(cfg_file, CONTENTS).context("unable to write config file")?;
+
+    Ok(())
+}

src/cargo-deny/main.rs

@@ -8,6 +8,7 @@ use structopt::StructOpt;
 
 mod check;
 mod common;
+mod init;
 mod list;
 
 #[derive(StructOpt, Debug)]
@@ -18,6 +19,9 @@ enum Command {
     /// Checks your dependency graph based on the configuration you specify
     #[structopt(name = "check")]
     Check(check::Args),
+    /// Initialize an empty deny.toml file in your current crate.
+    #[structopt(name = "init")]
+    Init(init::Args),
 }
 
 fn parse_level(s: &str) -> Result<log::LevelFilter, Error> {
@@ -141,6 +145,7 @@ fn real_main() -> Result<(), Error> {
             all_crates,
             license_store,
         ),
+        Command::Init(init) => init::cmd(init, context_dir),
     }
 }