devcontainers: add initial dev-container setup and scripts

.devcontainer/devcontainer.json

@@ -0,0 +1,14 @@
+{
+	"name": "exercism-generic",
+	"image": "vpayno/ci-generic-debian:latest",
+	"customizations": {
+		"vscode": {
+			"settings": {},
+			"extensions": []
+		}
+	},
+	"portsAttributes": {},
+	"postCreateCommand": "cd /workspaces/exercism-workspace/; tree .devcontainer/; ./.devcontainer/scripts/dc-up-post-create-command.sh",
+	"remoteUser": "root",
+	"shutdownAction": "none"
+}

.devcontainer/scripts/dc-down

@@ -0,0 +1,13 @@
+#!/usr/bin/env bash
+
+declare devcontainer_id
+
+devcontainer_id="$(docker ps --format 'json' | jq -r '. | select(.Labels | contains("exercism-workspace")) | select(.Image == "vpayno/ci-generic-debian:latest") | .ID')"
+
+# delete old container
+if [[ -n ${devcontainer_id} ]]; then
+	printf "Removing old container...\n"
+	docker rm -f "${devcontainer_id}"
+	printf "done.\n"
+fi
+printf "\n"

.devcontainer/scripts/dc-run

@@ -0,0 +1,15 @@
+#!/usr/bin/env bash
+
+set -e
+set -x
+
+if [[ -f ./.devcontainer/scripts/data.tmp ]]; then
+	# shellcheck disable=SC1091 source=.devcontainer/scripts/data.tmp
+	source ./.devcontainer/scripts/data.tmp
+fi
+
+if [[ ${1} == --root ]]; then
+	devcontainer exec --workspace-folder "${PWD}" bash -i
+else
+	devcontainer exec --workspace-folder "${PWD}" sudo -u "${devcontainer_username:-USER}" -i
+fi

.devcontainer/scripts/dc-up

@@ -0,0 +1,52 @@
+#!/usr/bin/env bash
+
+# shellcheck disable=SC2120
+rword() {
+	local -a words
+	local word
+	local -i word_size=${1:-0}
+	local -i tries
+
+	mapfile -t words </usr/share/dict/words
+	if [[ ${word_size} -le 7 ]]; then
+		((word_size = (RANDOM % 11) + 5))
+	fi
+
+	tries=0
+	while [[ ${#word} -le $((word_size - (RANDOM % 5))) ]] || [[ ${#word} -ge $((word_size - (RANDOM % 5))) ]]; do
+		word=${words[$((RANDOM * (RANDOM % 2) + RANDOM * (RANDOM % 2 + 2)))]}
+		((tries += 1))
+		[[ ${tries} -ge ${#words[@]} ]] && break
+	done
+
+	echo "${word}"
+}
+
+declare devcontainer_id
+
+devcontainer_id="$(docker ps --format 'json' | jq -r '. | select(.Labels | contains("exercism-workspace")) | select(.Image == "vpayno/ci-generic-debian:latest") | .ID')"
+
+declare -x devcontainer_username
+declare -x devcontainer_password
+declare -x -i devcontainer_uid
+declare -x -i devcontainer_gid
+
+# create data for setup scripts that run inside dev-container
+cat >./.devcontainer/scripts/data.tmp <<-EOF
+	devcontainer_username="$(id --name --user)"
+	devcontainer_password="$(rword)"
+	devcontainer_uid="$(id --user)"
+	devcontainer_gid="$(id --group)"
+EOF
+
+# delete old container
+if [[ -n ${devcontainer_id} ]]; then
+	printf "Removing old container...\n"
+	docker rm -f "${devcontainer_id}"
+	printf "done.\n"
+fi
+printf "\n"
+
+# starts up container
+time devcontainer up --mount type=bind,source="${HOME}",target="${HOME}" --workspace-folder "${PWD}"
+printf "\n"

.devcontainer/scripts/dc-up-post-create-command.sh

@@ -0,0 +1,35 @@
+#!/usr/bin/env bash
+
+set -x
+set -e
+
+# shellcheck disable=SC1091 source=.devcontainer/scripts/data.tmp
+source /workspaces/exercism-workspace/.devcontainer/scripts/data.tmp
+
+# shellcheck disable=SC2154
+{
+	groupadd --gid "${devcontainer_gid}" "${devcontainer_username}"
+	useradd --uid "${devcontainer_uid}" --gid "${devcontainer_gid}" --no-create-home --groups docker "${devcontainer_username}"
+	chsh --shell /bin/bash "${devcontainer_username}"
+	printf "%s\n%s\n" "${devcontainer_password}" "${devcontainer_password}" | passwd "${devcontainer_username}"
+	id "${devcontainer_username}"
+}
+
+declare -a cargo_pkgs=(
+	bacon
+	cargo-fuzz
+	cargo-generate
+	cargo-scaffold
+	cargo-spellcheck
+	git-cliff
+	irust
+	ripgrep
+)
+
+# these commands also run as root
+
+cargo install --locked "${cargo_pkgs[@]}"
+printf "\n"
+
+rustup component add rust-analyzer
+printf "\n"

.gitignore

@@ -84,3 +84,6 @@ rust/index.scip
 # wasm
 node_modules/
 package-lock.json
+
+# dev-container
+/.devcontainer/scripts/data.tmp