pkgs: add drone-rsync

A very simple wrapper script that I will migrate to, since 'drone-scp'
does not work for me anymore.

pkgs/default.nix

@@ -12,6 +12,8 @@ pkgs.lib.makeScope pkgs.newScope (pkgs: {
 
   dragger = pkgs.callPackage ./dragger { };
 
+  drone-rsync = pkgs.callPackage ./drone-rsync { };
+
   drone-scp = pkgs.callPackage ./drone-scp { };
 
   ff2mpv-go = pkgs.callPackage ./ff2mpv-go { };

pkgs/drone-rsync/default.nix

@@ -0,0 +1,43 @@
+{ lib, makeWrapper, openssh, rsync, shellcheck, sshpass, stdenvNoCC }:
+stdenvNoCC.mkDerivation rec {
+  pname = "drone-rsync";
+  version = "0.1.0";
+
+  src = ./drone-rsync;
+
+  buildInputs = [
+    makeWrapper
+    shellcheck
+  ];
+
+  dontUnpack = true;
+
+  buildPhase = ''
+    shellcheck $src
+  '';
+
+  installPhase = ''
+    mkdir -p $out/bin
+    cp $src $out/bin/${pname}
+    chmod a+x $out/bin/${pname}
+  '';
+
+  wrapperPath = lib.makeBinPath [
+    openssh
+    rsync
+    sshpass
+  ];
+
+  fixupPhase = ''
+    patchShebangs $out/bin/${pname}
+    wrapProgram $out/bin/${pname} --prefix PATH : "${wrapperPath}"
+  '';
+
+  meta = with lib; {
+    description = "Helper script to run rsync in a CI pipeline";
+    homepage = "https://gitea.belanyi.fr/ambroisie/nix-config";
+    license = with licenses; [ mit ];
+    platforms = platforms.unix;
+    maintainers = with maintainers; [ ambroisie ];
+  };
+}

pkgs/drone-rsync/drone-rsync

@@ -0,0 +1,31 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+ARGS=(
+    # Show readable progress in log
+    --verbose
+    --human-readable
+    --progress
+    # Have a one-to-one copy
+    --archive
+    --compress
+    --recursive
+    --delete
+    # Configure ssh client
+    --rsh "ssh -p ${SYNC_PORT:-22} -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null"
+)
+
+eval "$(ssh-agent)"
+SSHPASS="${SYNC_PASSPHRASE:-}" sshpass -P 'passphrase' -v -e ssh-add <(echo "${SYNC_KEY}")
+
+if [ -n "${SYNC_DRY_RUN:-}" ]; then
+    ARGS+=(--dry-run)
+fi
+
+# shellcheck disable=2086
+# FIXME: have a safer way to allow globbing the source
+rsync \
+    "${ARGS[@]}" \
+    ${SYNC_SOURCE} \
+    "${SYNC_USERNAME}@${SYNC_HOST}:${SYNC_TARGET}"