Add keygen command. (#9)

* Keygen skeleton.

* [keygen] Implement the basic features

* [keygen] synchronize files before exiting

* [keygen] Add help documentation

* [keygen] Generate '.ds' files for KSKs

* [keygen] Use 'display_as_bind()'

* [keygen] Add support for symlinks (Unix only)

* [keygen] Improve errors and support '.ds' symlinks

* Implement ldns-specific parsing for 'keygen'

* [keygen] Implement '-v' with version info

* [keygen] Add 'cfg(unix)' in ldns-parsing

* [keygen] Correctly handle duplicate options in ldns parsing

* Revert "[keygen] Implement '-v' with version info"

This reverts commit 643ab86bd4.

See: <https://github.com/NLnetLabs/dnst/pull/9#discussion_r1843460496>

* [keygen] Integrate the use of 'Env'

* [workflows/ci] Add OpenSSL installation steps

* [workflows/ci] Integrate OpenSSL for 'minimal_versions'

* [keygen] Improve the 'dnst' interface

* [keygen] Satisfy clippy

* [keygen] Simplify symlink CLI

* Add basic filesystem operations to 'Env'

* [keygen] Use symlink ops provided by 'Env'

* [keygen] Add basic tests for argument parsing

* [keygen] Add tests

* [keygen] Satisfy 'minimal-versions'

* [keygen] Satisfy clippy

* [keygen] Add Windows-specific missing branch

* [keygen] Document parsing for 'symlink'

* [keygen] Report error on '-r'

* [env] Refactor util fns into a 'util' module

* [keygen::symlink] Mark params as used, for Windows

* [keygen] Fix double error message

See: <https://github.com/NLnetLabs/dnst/pull/9#discussion_r1862213985>

* [keygen] Use 'Args::Report'

* [keygen] Allow invalid HTML in docs for Clap

* Use 'domain'-style imports

* [keygen] Use uppercase for expected clap values

* [keygen] use lowercase value names in Clap

---------

Co-authored-by: arya dradjica <arya@nlnetlabs.nl>

.github/workflows/ci.yml

@@ -10,6 +10,13 @@ jobs:
       matrix:
         os: [ubuntu-latest, windows-latest, macOS-latest]
         rust: [1.78.0, stable, beta, nightly]
+    env:
+        RUSTFLAGS: "-D warnings"
+        # We use 'vcpkg' to install OpenSSL on Windows.
+        VCPKG_ROOT: "${{ github.workspace }}\\vcpkg"
+        VCPKGRS_TRIPLET: x64-windows-release
+        # Ensure that OpenSSL is dynamically linked.
+        VCPKGRS_DYNAMIC: 1
     steps:
     - name: Checkout repository
       uses: actions/checkout@v1
@@ -17,6 +24,16 @@ jobs:
       uses: hecrj/setup-rust-action@v2
       with:
         rust-version: ${{ matrix.rust }}
+    - if: matrix.os == 'ubuntu-latest'
+      run: sudo apt-get install -y libssl-dev
+    - if: matrix.os == 'windows-latest'
+      id: vcpkg
+      uses: johnwason/vcpkg-action@v6
+      with:
+        pkgs: openssl
+        triplet: ${{ env.VCPKGRS_TRIPLET }}
+        token: ${{ github.token }}
+        github-binarycache: true
     - if: matrix.rust == 'stable'
       run: rustup component add clippy
     - if: matrix.rust == 'stable'
@@ -36,6 +53,8 @@ jobs:
       uses: hecrj/setup-rust-action@v2
       with:
         rust-version: "1.78.0"
+    - name: Install OpenSSL
+      run: sudo apt-get install -y libssl-dev
     - name: Install nightly Rust
       run: rustup install nightly
     - name: Check with minimal-versions