Add cargo-deny integration

- Add `deny.toml` for `cargo deny` with advisory error for `RUSTSEC-
  2020-0071` disabled as it does not affect chrono (or us for that
  matter).
  Allow multiple versions as there is not much we can do about those
  anyways and it clutters the output immensely.
  Add all currently used licenses to allow list.
  Deny the use of `ring` as it does not have a responsible disclosure
  policy: https://github.com/briansmith/ring#bug-reporting
- Run `cargo deny` as further `test` step in GitLab CI, so that it is
  among the last things that may fail in a merge request.

.gitlab-ci.yml

@@ -125,6 +125,20 @@ codespell:
   script:
     - codespell --summary -L "crate,ede,iff,mut,nd,te,uint,KeyServer,keyserver,Keyserver,keyservers,Keyservers,keypair,keypairs,KeyPair,fpr,dedup,deriver" -S "*.bin,*.gpg,*.pgp,./.git,*/target,Cargo.lock"
 
+deny:
+  tags:
+    - linux
+  stage: test
+  interruptible: true
+  image: 192.168.122.1:5000/sequoia-pgp/build-docker-image/rust-stable:latest
+
+  before_script:
+    - *before_script_start
+    - cargo install --locked cargo-deny
+    - *before_script_end
+  script:
+    - cargo deny check
+
 rust-stable:
   tags:
     - linux

deny.toml

@@ -0,0 +1,31 @@
+[advisories]
+ignore = [
+  "RUSTSEC-2020-0071", # chrono not affected by time 0.1 issue
+]
+unmaintained = "deny"
+yanked = "deny"
+
+[bans]
+multiple-versions = "allow"
+deny = [
+  # does not have responsible disclosure policy:
+  # https://github.com/briansmith/ring#bug-reporting
+  {name = "ring"},
+]
+
+[licenses]
+allow = [
+  "Apache-2.0",
+  "BSD-3-Clause",
+  "BSL-1.0",
+  "CC0-1.0",
+  "GPL-2.0",
+  "GPL-3.0",
+  "ISC",
+  "LGPL-2.0",
+  "LGPL-3.0",
+  "MIT",
+  "MIT-0",
+  "MPL-2.0",
+  "Unicode-DFS-2016",
+]

src/commands/decrypt.rs

@@ -149,11 +149,9 @@ impl<'a, 'certdb> Helper<'a, 'certdb> {
             session_keys,
             dump_session_key,
             dumper: if dump {
-                let width = if let Some((width, _)) = terminal_size() {
+                let width = terminal_size()
-                    width.0.into()
+                    .map(|(width, _height)| width.0.into())
-                } else {
+                    .unwrap_or(80);
-                    80
-                };
                 Some(PacketDumper::new(width, false))
             } else {
                 None