Merge pull request #50 from buildkite-plugins/add-interpreter-option

Add a shell option

README.md

@@ -120,9 +120,15 @@ Specify an explicit docker runtime. See the [docker run options documentation](h
 
 Example: `nvidia`
 
+### `shell` (optional)
+
+Set the shell to use for the command. Set it to `false` to pass the command directly to the `docker run` command. The default is `bash -c`.
+
+Example: `powershell -Command`
+
 ### `entrypoint` (optional)
 
-Override the image’s default entrypoint. See the [docker run --entrypoint documentation](https://docs.docker.com/engine/reference/run/#entrypoint-default-command-to-execute-at-runtime) for more details.
+Override the image’s default entrypoint, and defaults the `shell` option to `false`. See the [docker run --entrypoint documentation](https://docs.docker.com/engine/reference/run/#entrypoint-default-command-to-execute-at-runtime) for more details.
 
 Example: `/my/custom/entrypoint.sh`
 

hooks/command

@@ -81,14 +81,29 @@ fi
 # Support docker run --entrypoint
 if [[ -n "${BUILDKITE_PLUGIN_DOCKER_ENTRYPOINT:-}" ]] ; then
   args+=("--entrypoint" "${BUILDKITE_PLUGIN_DOCKER_ENTRYPOINT:-}")
+  BUILDKITE_PLUGIN_DOCKER_SHELL="${BUILDKITE_PLUGIN_DOCKER_SHELL:-false}"
+fi
+
+BUILDKITE_PLUGIN_DOCKER_SHELL="${BUILDKITE_PLUGIN_DOCKER_SHELL:-bash -c}"
+
+if [[ "${BUILDKITE_PLUGIN_DOCKER_SHELL}" =~ ^(false|off|0)$ ]] ; then
+  BUILDKITE_PLUGIN_DOCKER_SHELL=''
+fi
+
+args+=("${BUILDKITE_PLUGIN_DOCKER_IMAGE}")
+
+if [[ ! -z "${BUILDKITE_PLUGIN_DOCKER_SHELL:-}" ]]; then
+  # shellcheck disable=SC2206 # We want the word splits
+  args+=(${BUILDKITE_PLUGIN_DOCKER_SHELL} "${BUILDKITE_COMMAND}")
+else
+  # shellcheck disable=SC2206 # We want the word splits
+  args+=(${BUILDKITE_COMMAND})
 fi
 
 echo "--- :docker: Running ${BUILDKITE_COMMAND} in ${BUILDKITE_PLUGIN_DOCKER_IMAGE}"
 
 if [[ "${debug_mode:-off}" =~ (on) ]] ; then
-  printf "$ docker run ${args[*]} %q  %q" \
-    "${BUILDKITE_PLUGIN_DOCKER_IMAGE}" \
-    "${BUILDKITE_COMMAND}" >&2
+  echo "$ docker run ${args[*]}" >&2
 fi
 
-docker run "${args[@]}" "${BUILDKITE_PLUGIN_DOCKER_IMAGE}" bash -c "${BUILDKITE_COMMAND}"
+docker run "${args[@]}"

plugin.yml

@@ -29,6 +29,8 @@ configuration:
       type: boolean
     runtime:
       type: string
+    shell:
+      type: string
   required:
     - image
   additionalProperties: false

tests/command.bats

@@ -259,15 +259,15 @@ load '/usr/local/lib/bats/load.bash'
   unset BUILDKITE_COMMAND
 }
 
-@test "Runs with entrypoint option" {
+@test "Runs with entrypoint option w/o shell by default" {
   export BUILDKITE_PLUGIN_DOCKER_WORKDIR=/app
   export BUILDKITE_PLUGIN_DOCKER_IMAGE=image:tag
   export BUILDKITE_PLUGIN_DOCKER_MOUNT_BUILDKITE_AGENT=false
   export BUILDKITE_PLUGIN_DOCKER_ENTRYPOINT=/some/custom/entry/point
   export BUILDKITE_COMMAND="echo hello world"
 
   stub docker \
-    "run -it --rm --volume $PWD:/app --workdir /app --entrypoint /some/custom/entry/point image:tag bash -c 'echo hello world' : echo ran command in docker"
+    "run -it --rm --volume $PWD:/app --workdir /app --entrypoint /some/custom/entry/point image:tag echo hello world : echo ran command in docker"
 
   run $PWD/hooks/command
 
@@ -281,3 +281,74 @@ load '/usr/local/lib/bats/load.bash'
   unset BUILDKITE_PLUGIN_DOCKER_ENTRYPOINT
   unset BUILDKITE_COMMAND
 }
+
+@test "Runs with entrypoint option w/ explicit shell" {
+  export BUILDKITE_PLUGIN_DOCKER_WORKDIR=/app
+  export BUILDKITE_PLUGIN_DOCKER_IMAGE=image:tag
+  export BUILDKITE_PLUGIN_DOCKER_MOUNT_BUILDKITE_AGENT=false
+  export BUILDKITE_PLUGIN_DOCKER_ENTRYPOINT=/some/custom/entry/point
+  export BUILDKITE_PLUGIN_DOCKER_SHELL='custom-bash -a -b'
+  export BUILDKITE_COMMAND="echo hello world"
+
+  stub docker \
+    "run -it --rm --volume $PWD:/app --workdir /app --entrypoint /some/custom/entry/point image:tag custom-bash -a -b 'echo hello world' : echo ran command in docker"
+
+  run $PWD/hooks/command
+
+  assert_success
+  assert_output --partial "ran command in docker"
+
+  unstub docker
+  unset BUILDKITE_PLUGIN_DOCKER_WORKDIR
+  unset BUILDKITE_PLUGIN_DOCKER_IMAGE
+  unset BUILDKITE_PLUGIN_DOCKER_MOUNT_BUILDKITE_AGENT
+  unset BUILDKITE_PLUGIN_DOCKER_ENTRYPOINT
+  unset BUILDKITE_PLUGIN_DOCKER_SHELL
+  unset BUILDKITE_COMMAND
+}
+
+@test "Runs with shell option" {
+  export BUILDKITE_PLUGIN_DOCKER_WORKDIR=/app
+  export BUILDKITE_PLUGIN_DOCKER_IMAGE=image:tag
+  export BUILDKITE_PLUGIN_DOCKER_MOUNT_BUILDKITE_AGENT=false
+  export BUILDKITE_PLUGIN_DOCKER_SHELL='custom-bash -a -b'
+  export BUILDKITE_COMMAND="echo hello world"
+
+  stub docker \
+    "run -it --rm --volume $PWD:/app --workdir /app image:tag custom-bash -a -b 'echo hello world' : echo ran command in docker"
+
+  run $PWD/hooks/command
+
+  assert_success
+  assert_output --partial "ran command in docker"
+
+  unstub docker
+  unset BUILDKITE_PLUGIN_DOCKER_WORKDIR
+  unset BUILDKITE_PLUGIN_DOCKER_IMAGE
+  unset BUILDKITE_PLUGIN_DOCKER_MOUNT_BUILDKITE_AGENT
+  unset BUILDKITE_PLUGIN_DOCKER_SHELL
+  unset BUILDKITE_COMMAND
+}
+
+@test "Runs with shell disabled" {
+  export BUILDKITE_PLUGIN_DOCKER_WORKDIR=/app
+  export BUILDKITE_PLUGIN_DOCKER_IMAGE=image:tag
+  export BUILDKITE_PLUGIN_DOCKER_MOUNT_BUILDKITE_AGENT=false
+  export BUILDKITE_PLUGIN_DOCKER_SHELL=false
+  export BUILDKITE_COMMAND="echo hello world"
+
+  stub docker \
+    "run -it --rm --volume $PWD:/app --workdir /app image:tag echo hello world : echo ran command in docker"
+
+  run $PWD/hooks/command
+
+  assert_success
+  assert_output --partial "ran command in docker"
+
+  unstub docker
+  unset BUILDKITE_PLUGIN_DOCKER_WORKDIR
+  unset BUILDKITE_PLUGIN_DOCKER_IMAGE
+  unset BUILDKITE_PLUGIN_DOCKER_MOUNT_BUILDKITE_AGENT
+  unset BUILDKITE_PLUGIN_DOCKER_SHELL
+  unset BUILDKITE_COMMAND
+}