Merge branch 'v4' of https://github.com/dirtbags/moth into v4

.github/workflows/docker_build_mothd.yml

@@ -1,12 +0,0 @@
-name: Mothd Docker build
-on: [push]
-
-jobs:
-  build-mothd:
-    name: Build mothd
-    runs-on: ubuntu-latest
-    steps:
-      - name: Retrieve code
-        uses: actions/checkout@v1
-      - name: Build mothd
-        run: docker build .

.github/workflows/publish.yml

@@ -1,4 +1,4 @@
-name: Publish Container image
+name: Publish
 on:
   release:
     types: [published]
@@ -10,18 +10,45 @@ jobs:
     steps:
       - name: Retrieve code
         uses: actions/checkout@v1
-      - name: Push to GitHub Packages
+
+      - name: Push moth to GitHub Packages
         uses: docker/build-push-action@v2
         with:
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
+          target: moth
+          file: build/package/Containerfile
           registry: docker.pkg.github.com
           repository: dirtbags/moth/moth
           tag_with_ref: true
-      - name: Push to Docker Hub
+          
+      - name: Push moth-devel to GitHub Packages
+        uses: docker/build-push-action@v2
+        with:
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+          target: moth-devel
+          file: build/package/Containerfile
+          registry: docker.pkg.github.com
+          repository: dirtbags/moth/moth-devel
+          tag_with_ref: true
+          
+      - name: Push moth to Docker Hub
         uses: docker/build-push-action@v2
         with:
           username: neale
           password: ${{ secrets.DOCKER_TOKEN }}
-          registry: dirtbags/moth
+          target: moth
+          file: build/packages/Containerfile
+          repository: dirtbags/moth
+          tag_with_ref: true
+
+      - name: Push moth-devel to Docker Hub
+        uses: docker/build-push-action@v2
+        with:
+          username: neale
+          password: ${{ secrets.DOCKER_TOKEN }}
+          target: moth-devel
+          file: build/packages/Containerfile
+          repository: dirtbags/moth-devel
           tag_with_ref: true

.github/workflows/test.yml

@@ -0,0 +1,16 @@
+name: Tests
+on: [push]
+
+jobs:
+  test-mothd:
+    name: Test mothd
+    runs-on: ubuntu-latest
+    steps:
+      - name: Install Go
+        uses: actions/setup-go@v2
+        with:
+          go-version: 1.13            
+      - name: Retrieve code
+        uses: actions/checkout@v1
+      - name: Test
+        run: go test ./...

.gitignore

@@ -4,8 +4,5 @@
 *.o
 .idea
 ./bin/
-build/
-cache/
-target/
 puzzles
 __debug_bin

CHANGELOG.md

@@ -4,20 +4,29 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## [4.0.0] - Unreleased
+## [v4.0.0] - Unreleased
-### Added
-- New `transpile` command to replace some functionality of devel server
-
 ### Changed
 - Major rewrite/refactor of `mothd`
-  - There are now providers for State, Puzzles, and Theme. Sqlite, Redis, or S3 should fit in easily.
+  - Clear separation of roles: State, Puzzles, and Theme
+    - Sqlite, Redis, or S3 should fit in easily now
+    - Will allow "dynamic" puzzles now, we just need a flag to enable it
   - Server no longer provides unlocked content
-  - Puzzle URLs are now just `/content/${cat}/${points}/`
+    - Puzzle URLs are now just `/content/${cat}/${points}/`
-- `state/until` is now `state/hours` and can specify multiple begin/end hours
+  - Changes to `state` directory
-- `state/disabled` is now `state/enabled`
+    - Most files now have a bit of (English) documentation at the beginning
-- Mothball structure has changed substantially
+    - `state/until` is now `state/hours` and can specify multiple begin/end hours
+    - `state/disabled` is now `state/enabled`
+- Mothball structure has changed
   - Mothballs no longer contain `map.txt`
+  - Mothballs no longer obfuscate content paths
   - Clients now expect unlocked puzzles to just be `map[string][]int`
+- New `/state` API endpoint
+  - Provides *all* server state: event log, team mapping, messages, configuration
+
+### Added
+- New `transpile` CLI command
+  - Provides `mothball` action to create mothballs
+  - Lets you test a few development server things, if you want
 
 ### Deprecated
 

Dockerfile

@@ -1,19 +0,0 @@
-FROM golang:1.13 AS builder
-COPY go.* /src/
-COPY pkg /src/pkg/
-COPY cmd /src/cmd/
-COPY theme /target/theme/
-COPY example-puzzles /target/puzzles/
-COPY LICENSE.md /target/
-WORKDIR /src/
-RUN CGO_ENABLED=0 GOOS=linux go install -i -a -ldflags '-extldflags "-static"' ./...
-RUN mkdir -p /target/bin
-RUN cp /go/bin/* /target/bin/
-
-FROM builder AS tester
-RUN go test ./...
-
-FROM scratch
-COPY --from=builder /target /
-
-ENTRYPOINT [ "/bin/mothd" ]

README.md

@@ -1,8 +1,8 @@
 Dirtbags Monarch Of The Hill Server
 =====================
 
-![](https://github.com/dirtbags/moth/workflows/Mothd%20Docker%20build/badge.svg?branch=master)
+![Build badge](https://github.com/dirtbags/moth/workflows/Mothd%20Docker%20build/badge.svg?branch=master)
-![](https://github.com/dirtbags/moth/workflows/moth-devel%20Docker%20build/badge.svg?branch=master)
+![Go report card](https://goreportcard.com/badge/github.com/dirtbags/moth)
 
 Monarch Of The Hill (MOTH) is a puzzle server.
 We (the authors) have used it for instructional and contest events called

VERSION

@@ -1 +0,0 @@
-3.5.1

build.sh

@@ -1,14 +0,0 @@
-#! /bin/sh
-
-set -e
-
-read version < VERSION
-
-cd $(dirname $0)
-for img in moth moth-devel; do
-    echo "==== $img"
-    sudo docker build --build-arg http_proxy=$http_proxy --build-arg https_proxy=$https_proxy --tag dirtbags/$img --tag dirtbags/$img:$version -f Dockerfile.$img .
-    [ "$1" = "-push" ] && docker push dirtbags/$img:$version && docker push dirtbags/$img:latest
-done
-
-exit 0

build/package/Containerfile

@@ -0,0 +1,37 @@
+FROM golang:1.13 AS builder
+COPY go.* /src/
+COPY pkg /src/pkg/
+COPY cmd /src/cmd/
+COPY theme /target/theme/
+COPY example-puzzles /target/puzzles/
+COPY LICENSE.md /target/
+WORKDIR /src/
+RUN CGO_ENABLED=0 GOOS=linux go install -i -a -ldflags '-extldflags "-static"' ./...
+
+# I can't put these in /target/bin: doing so would cause the devel server to overwrite Ubuntu's /bin
+RUN mkdir -p /target/bin/
+RUN cp /go/bin/* /target/
+
+##########
+
+FROM builder AS tester
+RUN go test ./...
+
+##########
+
+FROM scratch AS moth
+COPY --from=builder /target /
+ENTRYPOINT [ "/mothd" ]
+
+##########
+
+FROM ubuntu AS moth-devel
+RUN apt-get -y update && apt-get -y install \
+    build-essential \
+    bsdgames \
+    figlet toilet \
+    python3 \
+    python3-pil \
+    lua5.3
+COPY --from=builder /bin/* /
+CMD [ "/mothd", "-puzzles", "/puzzles" ]

build/package/build.sh

@@ -0,0 +1,22 @@
+#! /bin/sh
+
+set -e
+
+cd $(dirname $0)/../..
+
+PODMAN=$(command -v podman || echo docker)
+VERSION=$(cat CHANGELOG.md | awk -F '[][]' '/^## \[/ {print $2; exit}')
+
+for target in moth moth-devel; do
+    tag=dirtbags/$target:$VERSION
+    echo "==== Building $tag"
+    $PODMAN build \
+        --build-arg http_proxy --build-arg https_proxy --build-arg no_proxy \
+        --tag dirtbags/$target \
+        --tag dirtbags/$target:$VERSION \
+        --target $target \
+        -f build/package/Containerfile .
+    [ "$1" = "-push" ] && docker push dirtbags/$target:$VERSION && docker push dirtbags/$img:latest
+done
+
+exit 0

cmd/mothd/httpd.go

@@ -5,6 +5,7 @@ import (
 	"net/http"
 	"strconv"
 	"strings"
+	"time"
 
 	"github.com/dirtbags/moth/pkg/jsend"
 )
@@ -29,6 +30,10 @@ func NewHTTPServer(base string, server *MothServer) *HTTPServer {
 	h.HandleMothFunc("/register", h.RegisterHandler)
 	h.HandleMothFunc("/answer", h.AnswerHandler)
 	h.HandleMothFunc("/content/", h.ContentHandler)
+
+	if server.Config.Devel {
+		h.HandleMothFunc("/mothballer/", h.MothballerHandler)
+	}
 	return h
 }
 
@@ -128,16 +133,16 @@ func (h *HTTPServer) AnswerHandler(mh MothRequestHandler, w http.ResponseWriter,
 
 // ContentHandler returns static content from a given puzzle
 func (h *HTTPServer) ContentHandler(mh MothRequestHandler, w http.ResponseWriter, req *http.Request) {
-	trimLen := len(h.base) + len("/content/")
+	parts := strings.SplitN(req.URL.Path[len(h.base)+1:], "/", 4)
-	parts := strings.SplitN(req.URL.Path[trimLen:], "/", 3)
+	if len(parts) < 4 {
-	if len(parts) < 3 {
+		http.NotFound(w, req)
-		http.Error(w, "Not Found", http.StatusNotFound)
 		return
 	}
 
-	cat := parts[0]
+	// parts[0] == "content"
-	pointsStr := parts[1]
+	cat := parts[1]
-	filename := parts[2]
+	pointsStr := parts[2]
+	filename := parts[3]
 
 	if filename == "" {
 		filename = "puzzle.json"
@@ -154,3 +159,23 @@ func (h *HTTPServer) ContentHandler(mh MothRequestHandler, w http.ResponseWriter
 
 	http.ServeContent(w, req, filename, mtime, mf)
 }
+
+// MothballerHandler returns a mothball
+func (h *HTTPServer) MothballerHandler(mh MothRequestHandler, w http.ResponseWriter, req *http.Request) {
+	parts := strings.SplitN(req.URL.Path[len(h.base)+1:], "/", 2)
+	if len(parts) < 2 {
+		http.NotFound(w, req)
+		return
+	}
+
+	// parts[0] == "mothballer"
+	filename := parts[1]
+	cat := strings.TrimSuffix(filename, ".mb")
+	mothball, err := mh.Mothball(cat)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+
+	http.ServeContent(w, req, filename, time.Now(), mothball)
+}

cmd/mothd/httpd_test.go

@@ -8,6 +8,8 @@ import (
 	"net/url"
 	"testing"
 	"time"
+
+	"github.com/spf13/afero"
 )
 
 const TestParticipantID = "shipox"
@@ -123,3 +125,39 @@ func TestHttpd(t *testing.T) {
 		t.Error("Unexpected body", r.Body.String())
 	}
 }
+
+func TestDevelMemHttpd(t *testing.T) {
+	srv := NewTestServer()
+
+	{
+		hs := NewHTTPServer("/", srv)
+
+		if r := hs.TestRequest("/mothballer/pategory.md", nil); r.Result().StatusCode != 404 {
+			t.Error("Should have gotten a 404 for mothballer in prod mode")
+		}
+	}
+
+	{
+		srv.Config.Devel = true
+		hs := NewHTTPServer("/", srv)
+
+		if r := hs.TestRequest("/mothballer/pategory.md", nil); r.Result().StatusCode != 500 {
+			t.Log(r.Body.String())
+			t.Log(r.Result())
+			t.Error("Should have given us an internal server error, since category is a mothball")
+		}
+	}
+}
+
+func TestDevelFsHttps(t *testing.T) {
+	fs := afero.NewBasePathFs(afero.NewOsFs(), "testdata")
+	transpilerProvider := NewTranspilerProvider(fs)
+	srv := NewMothServer(Configuration{Devel: true}, NewTestTheme(), NewTestState(), transpilerProvider)
+	hs := NewHTTPServer("/", srv)
+
+	if r := hs.TestRequest("/mothballer/cat0.mb", nil); r.Result().StatusCode != 200 {
+		t.Log(r.Body.String())
+		t.Log(r.Result())
+		t.Error("Didn't get a Mothball")
+	}
+}

cmd/mothd/main.go

@@ -2,7 +2,9 @@ package main
 
 import (
 	"flag"
+	"fmt"
 	"mime"
+	"os"
 	"time"
 
 	"github.com/spf13/afero"
@@ -44,8 +46,22 @@ func main() {
 		"/",
 		"Base URL of this instance",
 	)
+	seed := flag.String(
+		"seed",
+		"",
+		"Random seed to use, overrides $SEED",
+	)
 	flag.Parse()
 
+	// Set random seed
+	if *seed == "" {
+		*seed = os.Getenv("SEED")
+	}
+	if *seed == "" {
+		*seed = fmt.Sprintf("%d%d", os.Getpid(), time.Now().Unix())
+	}
+	os.Setenv("SEED", *seed)
+
 	osfs := afero.NewOsFs()
 	theme := NewTheme(afero.NewBasePathFs(osfs, *themePath))
 	state := NewState(afero.NewBasePathFs(osfs, *statePath))

cmd/mothd/mothballs.go

@@ -3,6 +3,7 @@ package main
 import (
 	"archive/zip"
 	"bufio"
+	"bytes"
 	"fmt"
 	"io"
 	"log"
@@ -172,6 +173,11 @@ func (m *Mothballs) refresh() {
 	}
 }
 
+// Mothball just returns an error
+func (m *Mothballs) Mothball(cat string) (*bytes.Reader, error) {
+	return nil, fmt.Errorf("Can't repackage a compiled mothball")
+}
+
 // Maintain performs housekeeping for Mothballs.
 func (m *Mothballs) Maintain(updateInterval time.Duration) {
 	m.refresh()

cmd/mothd/providercommand.go

@@ -4,6 +4,7 @@ package main
 import (
 	"bytes"
 	"context"
+	"fmt"
 	"io"
 	"log"
 	"os"
@@ -122,6 +123,11 @@ func (pc ProviderCommand) CheckAnswer(cat string, points int, answer string) (bo
 	return true, nil
 }
 
+// Mothball just returns an error
+func (pc ProviderCommand) Mothball(cat string) (*bytes.Reader, error) {
+	return nil, fmt.Errorf("Can't package a command-generated category")
+}
+
 // Maintain does nothing: a command puzzle ProviderCommand has no housekeeping
 func (pc ProviderCommand) Maintain(updateInterval time.Duration) {
 }

cmd/mothd/server.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"bytes"
 	"fmt"
 	"io"
 	"strconv"
@@ -41,6 +42,7 @@ type PuzzleProvider interface {
 	Open(cat string, points int, path string) (ReadSeekCloser, time.Time, error)
 	Inventory() []Category
 	CheckAnswer(cat string, points int, answer string) (bool, error)
+	Mothball(cat string) (*bytes.Reader, error)
 	Maintainer
 }
 
@@ -229,3 +231,16 @@ func (mh *MothRequestHandler) ExportState() *StateExport {
 
 	return &export
 }
+
+// Mothball generates a mothball for the given category.
+func (mh *MothRequestHandler) Mothball(cat string) (r *bytes.Reader, err error) {
+	if !mh.Config.Devel {
+		return nil, fmt.Errorf("Cannot mothball in production mode")
+	}
+	for _, provider := range mh.PuzzleProviders {
+		if r, err = provider.Mothball(cat); err == nil {
+			return r, nil
+		}
+	}
+	return nil, err
+}

cmd/mothd/transpiler.go

@@ -69,6 +69,12 @@ func (p TranspilerProvider) CheckAnswer(cat string, points int, answer string) (
 	return c.Answer(points, answer), nil
 }
 
+// Mothball packages up a category into a mothball.
+func (p TranspilerProvider) Mothball(cat string) (*bytes.Reader, error) {
+	c := transpile.NewFsCategory(p.fs, cat)
+	return transpile.Mothball(c)
+}
+
 // Maintain performs housekeeping.
 func (p TranspilerProvider) Maintain(updateInterval time.Duration) {
 	// Nothing to do here.

cmd/transpile/main.go

@@ -32,17 +32,21 @@ func nothing() error {
 	return nil
 }
 
+func usage(w io.Writer) {
+	fmt.Fprintln(w, "Usage: transpile COMMAND [flags]")
+	fmt.Fprintln(w, "")
+	fmt.Fprintln(w, " mothball: Compile a mothball")
+	fmt.Fprintln(w, " inventory: Show category inventory")
+	fmt.Fprintln(w, " open: Open a file for a puzzle")
+	fmt.Fprintln(w, " answer: Check correctness of an answer")
+}
+
 // ParseArgs parses arguments and runs the appropriate action.
 func (t *T) ParseArgs() (Command, error) {
 	var cmd Command
 
 	if len(t.Args) == 1 {
-		fmt.Fprintln(t.Stderr, "Usage: transpile COMMAND [flags]")
+		usage(t.Stderr)
-		fmt.Fprintln(t.Stderr, "")
-		fmt.Fprintln(t.Stderr, " mothball: Compile a mothball")
-		fmt.Fprintln(t.Stderr, " inventory: Show category inventory")
-		fmt.Fprintln(t.Stderr, " open: Open a file for a puzzle")
-		fmt.Fprintln(t.Stderr, " answer: Check correctness of an answer")
 		return nothing, nil
 	}
 
@@ -60,7 +64,11 @@ func (t *T) ParseArgs() (Command, error) {
 	case "answer":
 		flags.StringVar(&t.answer, "answer", "", "Answer to check")
 		cmd = t.CheckAnswer
+	case "help":
+		usage(t.Stderr)
+		return nothing, nil
 	default:
+		usage(t.Stderr)
 		return nothing, fmt.Errorf("%s is not a valid command", t.Args[1])
 	}
 
@@ -69,6 +77,7 @@ func (t *T) ParseArgs() (Command, error) {
 		return nothing, err
 	}
 	if *directory != "" {
+		log.Println(*directory)
 		t.fs = afero.NewBasePathFs(t.BaseFs, *directory)
 	} else {
 		t.fs = t.BaseFs
@@ -101,6 +110,7 @@ func (t *T) PrintInventory() error {
 }
 
 // DumpFile writes a file to the writer.
+// BUG(neale): The "open" and "answer" actions don't work on categories with an "mkcategory" executable.
 func (t *T) DumpFile() error {
 	puzzle := transpile.NewFsPuzzle(t.fs)
 
@@ -160,6 +170,7 @@ func main() {
 		Stdout: os.Stdout,
 		Stderr: os.Stderr,
 		Args:   os.Args,
+		BaseFs: afero.NewOsFs(),
 	}
 	cmd, err := t.ParseArgs()
 	if err != nil {

example-puzzles/example/3/mkpuzzle

@@ -7,26 +7,12 @@ import random
 import shutil
 import sys
 
-parser = argparse.ArgumentParser("Generate a puzzle")
+random.seed(os.getenv("SEED", ""))
-parser.add_argument("--file", dest="file", help="File to provide, instead of puzzle")
-parser.add_argument("--answer", dest="answer", help="Answer to check, instead of providing puzzle")
-args = parser.parse_args()
-
-seed = hash(os.getenv("SEED"))
-random.seed(seed)
 
 words = ["apple", "pear", "peach", "tangerine", "orange", "potato", "carrot", "pea"]
 answer = ' '.join(random.sample(words, 4))
 
-if args.file:
+def puzzle():
-    f = open(args.file, "rb")
-    shutil.copyfileobj(f, sys.stdout.buffer)
-elif args.answer:
-    if args.answer == answer:
-        print("correct")
-    else:
-        print("incorrect")
-else:
     number = random.randint(20, 500)
     obj = {
         "Pre": {
@@ -53,3 +39,22 @@ else:
         }
     }
     json.dump(obj, sys.stdout)
+
+def open_file(filename):
+    f = open(filename, "rb")
+    shutil.copyfileobj(f, sys.stdout.buffer)
+
+def check_answer(check):
+    if answer == check:
+        print("correct")
+    else:
+        print("incorrect")
+
+if len(sys.argv) == 1:
+    puzzle()
+elif sys.argv[1] == "file":
+    open_file(sys.argv[2])
+elif sys.argv[1] == "answer":
+    check_answer(sys.argv[2])
+else:
+    raise RuntimeError("Unknown command: %s" % sys.argv[1])

pkg/transpile/category.go

@@ -4,8 +4,10 @@ import (
 	"bytes"
 	"context"
 	"encoding/json"
+	"fmt"
 	"log"
 	"os/exec"
+	"path"
 	"strconv"
 	"strings"
 	"time"
@@ -120,14 +122,22 @@ type FsCommandCategory struct {
 	timeout time.Duration
 }
 
-// Inventory returns a list of point values for this category.
+func (c FsCommandCategory) run(command string, args ...string) ([]byte, error) {
-func (c FsCommandCategory) Inventory() ([]int, error) {
 	ctx, cancel := context.WithTimeout(context.Background(), c.timeout)
 	defer cancel()
 
-	cmd := exec.CommandContext(ctx, c.command, "inventory")
+	cmdargs := append([]string{command}, args...)
-	stdout, err := cmd.Output()
+	cmd := exec.CommandContext(ctx, "./"+path.Base(c.command), cmdargs...)
-	if err != nil {
+	cmd.Dir = path.Dir(c.command)
+	return cmd.Output()
+}
+
+// Inventory returns a list of point values for this category.
+func (c FsCommandCategory) Inventory() ([]int, error) {
+	stdout, err := c.run("inventory")
+	if exerr, ok := err.(*exec.ExitError); ok {
+		return nil, fmt.Errorf("inventory: %s: %s", err, string(exerr.Stderr))
+	} else if err != nil {
 		return nil, err
 	}
 
@@ -143,11 +153,7 @@ func (c FsCommandCategory) Inventory() ([]int, error) {
 func (c FsCommandCategory) Puzzle(points int) (Puzzle, error) {
 	var p Puzzle
 
-	ctx, cancel := context.WithTimeout(context.Background(), c.timeout)
+	stdout, err := c.run("puzzle", strconv.Itoa(points))
-	defer cancel()
-
-	cmd := exec.CommandContext(ctx, c.command, "puzzle", strconv.Itoa(points))
-	stdout, err := cmd.Output()
 	if err != nil {
 		return p, err
 	}
@@ -163,21 +169,13 @@ func (c FsCommandCategory) Puzzle(points int) (Puzzle, error) {
 
 // Open returns an io.ReadCloser for the given filename.
 func (c FsCommandCategory) Open(points int, filename string) (ReadSeekCloser, error) {
-	ctx, cancel := context.WithTimeout(context.Background(), c.timeout)
+	stdout, err := c.run("file", strconv.Itoa(points), filename)
-	defer cancel()
-
-	cmd := exec.CommandContext(ctx, c.command, "file", strconv.Itoa(points), filename)
-	stdout, err := cmd.Output()
 	return nopCloser{bytes.NewReader(stdout)}, err
 }
 
 // Answer checks whether an answer is correct.
 func (c FsCommandCategory) Answer(points int, answer string) bool {
-	ctx, cancel := context.WithTimeout(context.Background(), c.timeout)
+	stdout, err := c.run("answer", strconv.Itoa(points), answer)
-	defer cancel()
-
-	cmd := exec.CommandContext(ctx, c.command, "answer", strconv.Itoa(points), answer)
-	stdout, err := cmd.Output()
 	if err != nil {
 		log.Printf("ERROR: Answering %d points: %s", points, err)
 		return false

pkg/transpile/common_test.go

@@ -13,7 +13,7 @@ pre:
     - Buster
     - DW
   attachments:
-    - filename: moo.txt
+    - moo.txt
 ---
 YAML body
 `)

pkg/transpile/inventory.go

@@ -3,6 +3,7 @@ package transpile
 import (
 	"log"
 	"sort"
+	"strings"
 
 	"github.com/spf13/afero"
 )
@@ -20,12 +21,16 @@ func FsInventory(fs afero.Fs) (Inventory, error) {
 
 	inv := make(Inventory)
 	for _, ent := range dirEnts {
+		if strings.HasPrefix(ent.Name(), ".") {
+			continue
+		}
 		if ent.IsDir() {
 			name := ent.Name()
 			c := NewFsCategory(fs, name)
 			puzzles, err := c.Inventory()
 			if err != nil {
-				return nil, err
+				log.Printf("Inventory: %s: %s", name, err)
+				continue
 			}
 			sort.Ints(puzzles)
 			inv[name] = puzzles

pkg/transpile/mothball.go

@@ -6,6 +6,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"io"
+	"os/exec"
 )
 
 // Mothball packages a Category up for a production server run.
@@ -37,7 +38,7 @@ func Mothball(c Category) (*bytes.Reader, error) {
 		}
 		puzzle, err := c.Puzzle(points)
 		if err != nil {
-			return nil, err
+			return nil, fmt.Errorf("Puzzle %d: %s", points, err)
 		}
 
 		// Record answers in answers.txt
@@ -45,13 +46,16 @@ func Mothball(c Category) (*bytes.Reader, error) {
 			fmt.Fprintln(answersTxt, points, answer)
 		}
 
-		// Remove all answers from puzzle object
+		// Remove answers and debugging from puzzle object
 		puzzle.Answers = []string{}
+		puzzle.Debug.Errors = []string{}
+		puzzle.Debug.Hints = []string{}
+		puzzle.Debug.Log = []string{}
 
 		// Write out Puzzle object
 		penc := json.NewEncoder(pw)
 		if err := penc.Encode(puzzle); err != nil {
-			return nil, err
+			return nil, fmt.Errorf("Puzzle %d: %s", points, err)
 		}
 
 		// Write out all attachments and scripts
@@ -63,11 +67,13 @@ func Mothball(c Category) (*bytes.Reader, error) {
 				return nil, err
 			}
 			ar, err := c.Open(points, att)
-			if err != nil {
+			if exerr, ok := err.(*exec.ExitError); ok {
-				return nil, err
+				return nil, fmt.Errorf("Puzzle %d: %s: %s: %s", points, att, err, string(exerr.Stderr))
+			} else if err != nil {
+				return nil, fmt.Errorf("Puzzle %d: %s: %s", points, att, err)
 			}
 			if _, err := io.Copy(aw, ar); err != nil {
-				return nil, err
+				return nil, fmt.Errorf("Puzzle %d: %s: %s", points, att, err)
 			}
 		}
 	}

pkg/transpile/puzzle.go

@@ -92,6 +92,26 @@ type StaticAttachment struct {
 	FilesystemPath string // Filename in backing FS (URL, mothball, or local FS)
 }
 
+// UnmarshalYAML allows a StaticAttachment to be specified as a single string.
+// The way the yaml library works is weird.
+func (sa *StaticAttachment) UnmarshalYAML(unmarshal func(interface{}) error) error {
+	if err := unmarshal(&sa.Filename); err == nil {
+		sa.FilesystemPath = sa.Filename
+		return nil
+	}
+
+	parts := new(struct {
+		Filename       string
+		FilesystemPath string
+	})
+	if err := unmarshal(parts); err != nil {
+		return err
+	}
+	sa.Filename = parts.Filename
+	sa.FilesystemPath = parts.FilesystemPath
+	return nil
+}
+
 // ReadSeekCloser provides io.Reader, io.Seeker, and io.Closer.
 type ReadSeekCloser interface {
 	io.Reader
@@ -307,8 +327,16 @@ func rfc822HeaderParser(r io.Reader) (StaticPuzzle, error) {
 			p.Debug.Summary = val[0]
 		case "hint":
 			p.Debug.Hints = val
+		case "solution":
+			p.Debug.Hints = val
 		case "ksa":
 			p.Post.KSAs = val
+		case "objective":
+			p.Post.Objective = val[0]
+		case "success.acceptable":
+			p.Post.Success.Acceptable = val[0]
+		case "success.mastery":
+			p.Post.Success.Mastery = val[0]
 		default:
 			return p, fmt.Errorf("Unknown header field: %s", key)
 		}
@@ -338,18 +366,19 @@ type FsCommandPuzzle struct {
 	timeout time.Duration
 }
 
-func (fp FsCommandPuzzle) run(args ...string) ([]byte, error) {
+func (fp FsCommandPuzzle) run(command string, args ...string) ([]byte, error) {
 	ctx, cancel := context.WithTimeout(context.Background(), fp.timeout)
 	defer cancel()
 
-	cmd := exec.CommandContext(ctx, "./"+path.Base(fp.command), args...)
+	cmdargs := append([]string{command}, args...)
+	cmd := exec.CommandContext(ctx, "./"+path.Base(fp.command), cmdargs...)
 	cmd.Dir = path.Dir(fp.command)
 	return cmd.Output()
 }
 
 // Puzzle returns a Puzzle struct for the current puzzle.
 func (fp FsCommandPuzzle) Puzzle() (Puzzle, error) {
-	stdout, err := fp.run()
+	stdout, err := fp.run("puzzle")
 	if exiterr, ok := err.(*exec.ExitError); ok {
 		return Puzzle{}, errors.New(string(exiterr.Stderr))
 	} else if err != nil {
@@ -379,7 +408,7 @@ func (c nopCloser) Close() error {
 // Open returns a newly-opened file.
 // BUG(neale): FsCommandPuzzle.Open() reads everything into memory, and will suck for large files.
 func (fp FsCommandPuzzle) Open(filename string) (ReadSeekCloser, error) {
-	stdout, err := fp.run("--file", filename)
+	stdout, err := fp.run("file", filename)
 	buf := nopCloser{bytes.NewReader(stdout)}
 	if err != nil {
 		return buf, err
@@ -390,7 +419,7 @@ func (fp FsCommandPuzzle) Open(filename string) (ReadSeekCloser, error) {
 
 // Answer checks whether the given answer is correct.
 func (fp FsCommandPuzzle) Answer(answer string) bool {
-	stdout, err := fp.run("--answer", answer)
+	stdout, err := fp.run("answer", answer)
 	if err != nil {
 		log.Printf("ERROR: checking answer: %s", err)
 		return false

pkg/transpile/puzzle_test.go

@@ -136,3 +136,35 @@ func TestFsPuzzle(t *testing.T) {
 		t.Error("Error answer marked correct")
 	}
 }
+
+func TestAttachment(t *testing.T) {
+	buf := bytes.NewBufferString(`
+pre:
+  attachments: 
+    - simple
+    - filename: complex
+      filesystempath: backingfile
+`)
+	p, err := yamlHeaderParser(buf)
+	if err != nil {
+		t.Error(err)
+		return
+	}
+
+	att := p.Pre.Attachments
+	if len(att) != 2 {
+		t.Error("Wrong number of attachments", att)
+	}
+	if att[0].Filename != "simple" {
+		t.Error("Attachment 0 wrong")
+	}
+	if att[0].Filename != att[0].FilesystemPath {
+		t.Error("Attachment 0 wrong")
+	}
+	if att[1].Filename != "complex" {
+		t.Error("Attachment 1 wrong")
+	}
+	if att[1].FilesystemPath != "backingfile" {
+		t.Error("Attachment 2 wrong")
+	}
+}

pkg/transpile/testdata/generated/mkcategory

@@ -20,9 +20,9 @@ case $1:$2:$3 in
     }
 }
 EOT
-                ;;
+        ;;
-    puzzle:*:)
+    puzzle:*)
-        fail "No such puzzle"
+        fail "No such puzzle: $2"
         ;;
     file:1:moo.txt)
         echo "Moo."

pkg/transpile/testdata/static/3/mkpuzzle

@@ -1,7 +1,12 @@
 #! /bin/sh
 
-case $1 in
+fail () {
-    "")
+    echo "ERROR: $*" 1>&2
+    exit 1
+}
+
+case $1:$2 in
+    puzzle:)
         cat <<'EOT'
 {
     "Answers": ["answer"],
@@ -12,34 +17,23 @@ case $1 in
 }
 EOT
         ;;
-    -file|--file)
+    file:moo.txt)
-        case $2 in
+        echo "Moo."
-            moo.txt)
-                echo "Moo."
-                ;;
-            *)
-                echo "ERROR: no such file: $1" 1>&2
-                exit 1
-                ;;
-        esac
         ;;
-    -answer|--answer)
+    file:*)
-        case $2 in
+        fail "no such file: $1"
-            moo)
+        ;;
-                echo "correct"
+    answer:moo)
-                ;;
+        echo "correct"
-            error)
+        ;;
-                echo "error" 1>&2
+    answer:error)
-                exit 1
+        fail "you requested an error"
-                ;;
+        ;;
-            *)
+    answer:*)
-                echo "incorrect"
+        echo "incorrect"
-                ;;
-        esac
         ;;
     *)
-        echo "ERROR: don't know what to do with $1" 1>&2
+        fail "What is $1"
-        exit 1
         ;;
 esac
     

theme/basic.css

@@ -93,6 +93,7 @@ input:invalid {
 #devel {
   background-color: #eee;
   color: black;
+  overflow: scroll;
 }
 #devel .string {
   color: #9c27b0;

theme/puzzle.js

@@ -88,11 +88,6 @@ function submit(e) {
   e.preventDefault()
   let data = new FormData(e.target)
   
-  // Kludge for patterned answers
-  let xAnswer = data.get("xAnswer")
-  if (xAnswer) {
-    data.set("answer", xAnswer)
-  }
   window.data = data
   fetch("answer", {
     method: "POST",
@@ -193,7 +188,6 @@ function answerCheck(e) {
   
   checkAnswer(answer)
   .then (correct => {
-    document.querySelector("[name=xAnswer").value = correct || answer
     if (correct) {
       ok.textContent = "⭕"
       ok.title = "Possibly correct"