Move website to a simpler jekyll-based template

This will allow us to merge the site into the main repository.

This merge allows the documentation to be kept up-to-date and
synchronized with the main project. Builds will be triggered on any
update, removing the need for the cron-based reploy.

2 files changed, 418 insertions, 0 deletions

diff --git a/website/cmd/generate-syscall-docs/main.go b/website/cmd/generate-syscall-docs/main.go
new file mode 100644
index 000000000..d0faed128
--- /dev/null
+++ b/website/cmd/generate-syscall-docs/main.go
@@ -0,0 +1,208 @@
+// Copyright 2019 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main
+
+import (
+	"bufio"
+	"encoding/json"
+	"flag"
+	"fmt"
+	"io"
+	"os"
+	"path/filepath"
+	"sort"
+	"strings"
+	"text/template"
+)
+
+type CompatibilityInfo map[string]map[string]ArchInfo
+
+// ArchInfo is compatbility doc for an architecture.
+type ArchInfo struct {
+	// Syscalls maps syscall number for the architecture to the doc.
+	Syscalls map[uintptr]SyscallDoc `json:"syscalls"`
+}
+
+// SyscallDoc represents a single item of syscall documentation.
+type SyscallDoc struct {
+	Name    string   `json:"name"`
+	Support string   `json:"support"`
+	Note    string   `json:"note,omitempty"`
+	URLs    []string `json:"urls,omitempty"`
+}
+
+var mdTemplate = template.Must(template.New("out").Parse(`---
+title: {{.OS}}/{{.Arch}}
+description: Syscall Compatibility Reference Documentation for {{.OS}}/{{.Arch}}
+layout: docs
+category: Compatibility
+weight: 50
+permalink: /docs/user_guide/compatibility/{{.OS}}/{{.Arch}}/
+noedit: true
+---
+
+This table is a reference of {{.OS}} syscalls for the {{.Arch}} architecture and
+their compatibility status in gVisor. gVisor does not support all syscalls and
+some syscalls may have a partial implementation.
+
+This page is automatically generated from the source code.
+
+Of {{.Total}} syscalls, {{.Supported}} syscalls have a full or partial
+implementation. There are currently {{.Unsupported}} unsupported
+syscalls. {{if .Undocumented}}{{.Undocumented}} syscalls are not yet documented.{{end}}
+
+<table>
+  <thead>
+    <tr>
+      <th>#</th>
+      <th>Name</th>
+      <th>Support</th>
+      <th>Notes</th>
+    </tr>
+  </thead>
+  <tbody>
+ 	{{range $i, $syscall := .Syscalls}}
+    <tr>
+      <td><a class="doc-table-anchor" id="{{.Name}}"></a>{{.Number}}</td>
+      <td><a href="http://man7.org/linux/man-pages/man2/{{.Name}}.2.html" target="_blank" rel="noopener">{{.Name}}</a></td>
+      <td>{{.Support}}</td>
+	  <td>{{.Note}} {{range $i, $url := .URLs}}<br/>See: <a href="{{.}}">{{.}}</a>{{end}}</td>
+    </tr>
+	{{end}}
+  </tbody>
+</table>
+`))
+
+// Fatalf writes a message to stderr and exits with error code 1
+func Fatalf(format string, a ...interface{}) {
+	fmt.Fprintf(os.Stderr, format, a...)
+	os.Exit(1)
+}
+
+func main() {
+	inputFlag := flag.String("in", "-", "File to input ('-' for stdin)")
+	outputDir := flag.String("out", ".", "Directory to output files.")
+
+	flag.Parse()
+
+	var input io.Reader
+	if *inputFlag == "-" {
+		input = os.Stdin
+	} else {
+		i, err := os.Open(*inputFlag)
+		if err != nil {
+			Fatalf("Error opening %q: %v", *inputFlag, err)
+		}
+		input = i
+	}
+	input = bufio.NewReader(input)
+
+	var info CompatibilityInfo
+	d := json.NewDecoder(input)
+	if err := d.Decode(&info); err != nil {
+		Fatalf("Error reading json: %v", err)
+	}
+
+	weight := 0
+	for osName, osInfo := range info {
+		for archName, archInfo := range osInfo {
+			outDir := filepath.Join(*outputDir, osName)
+			outFile := filepath.Join(outDir, archName+".md")
+
+			if err := os.MkdirAll(outDir, 0755); err != nil {
+				Fatalf("Error creating directory %q: %v", *outputDir, err)
+			}
+
+			f, err := os.OpenFile(outFile, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0644)
+			if err != nil {
+				Fatalf("Error opening file %q: %v", outFile, err)
+			}
+			defer f.Close()
+
+			weight += 10
+			data := struct {
+				OS           string
+				Arch         string
+				Weight       int
+				Total        int
+				Supported    int
+				Unsupported  int
+				Undocumented int
+				Syscalls     []struct {
+					Name    string
+					Number  uintptr
+					Support string
+					Note    string
+					URLs    []string
+				}
+			}{
+				OS:           strings.Title(osName),
+				Arch:         archName,
+				Weight:       weight,
+				Total:        0,
+				Supported:    0,
+				Unsupported:  0,
+				Undocumented: 0,
+				Syscalls: []struct {
+					Name    string
+					Number  uintptr
+					Support string
+					Note    string
+					URLs    []string
+				}{},
+			}
+
+			for num, s := range archInfo.Syscalls {
+				switch s.Support {
+				case "Full Support", "Partial Support":
+					data.Supported++
+				case "Unimplemented":
+					data.Unsupported++
+				default:
+					data.Undocumented++
+				}
+				data.Total++
+
+				for i := range s.URLs {
+					if !strings.HasPrefix(s.URLs[i], "http://") && !strings.HasPrefix(s.URLs[i], "https://") {
+						s.URLs[i] = "https://" + s.URLs[i]
+					}
+				}
+
+				data.Syscalls = append(data.Syscalls, struct {
+					Name    string
+					Number  uintptr
+					Support string
+					Note    string
+					URLs    []string
+				}{
+					Name:    s.Name,
+					Number:  num,
+					Support: s.Support,
+					Note:    s.Note, // TODO urls
+					URLs:    s.URLs,
+				})
+			}
+
+			sort.Slice(data.Syscalls, func(i, j int) bool {
+				return data.Syscalls[i].Number < data.Syscalls[j].Number
+			})
+
+			if err := mdTemplate.Execute(f, data); err != nil {
+				Fatalf("Error writing file %q: %v", outFile, err)
+			}
+		}
+	}
+}
diff --git a/website/cmd/gvisor-website/main.go b/website/cmd/gvisor-website/main.go
new file mode 100644
index 000000000..d86d7c735
--- /dev/null
+++ b/website/cmd/gvisor-website/main.go
@@ -0,0 +1,210 @@
+// Copyright 2019 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main
+
+import (
+	"flag"
+	"fmt"
+	"log"
+	"net/http"
+	"os"
+	"regexp"
+	"strings"
+)
+
+var redirects = map[string]string{
+	// Github redirects
+	"/change":    "https://github.com/google/gvisor",
+	"/issue":     "https://github.com/google/gvisor/issues",
+	"/issue/new": "https://github.com/google/gvisor/issues/new",
+	"/pr":        "https://github.com/google/gvisor/pulls",
+
+	// For links
+	"/faq": "/docs/user_guide/faq/",
+
+	// Redirects to compatibility docs.
+	"/c":             "/docs/user_guide/compatibility/",
+	"/c/linux/amd64": "/docs/user_guide/compatibility/linux/amd64/",
+
+	// Redirect for old urls
+	"/docs/user_guide/compatibility/amd64/": "/docs/user_guide/compatibility/linux/amd64/",
+	"/docs/user_guide/compatibility/amd64":  "/docs/user_guide/compatibility/linux/amd64/",
+	"/docs/user_guide/kubernetes/":          "/docs/user_guide/quick_start/kubernetes/",
+	"/docs/user_guide/kubernetes":           "/docs/user_guide/quick_start/kubernetes/",
+	"/docs/user_guide/oci/":                 "/docs/user_guide/quick_start/oci/",
+	"/docs/user_guide/oci":                  "/docs/user_guide/quick_start/oci/",
+	"/docs/user_guide/docker/":              "/docs/user_guide/quick_start/docker/",
+	"/docs/user_guide/docker":               "/docs/user_guide/quick_start/docker/",
+
+	// Deprecated, but links continue to work.
+	"/cl": "https://gvisor-review.googlesource.com",
+}
+
+var prefixHelpers = map[string]string{
+	"change": "https://github.com/google/gvisor/commit/%s",
+	"issue":  "https://github.com/google/gvisor/issues/%s",
+	"pr":     "https://github.com/google/gvisor/pull/%s",
+
+	// Redirects to compatibility docs.
+	"c/linux/amd64": "/docs/user_guide/compatibility/linux/amd64/#%s",
+
+	// Deprecated, but links continue to work.
+	"cl": "https://gvisor-review.googlesource.com/c/gvisor/+/%s",
+}
+
+var (
+	validId    = regexp.MustCompile(`^[A-Za-z0-9-]*/?$`)
+	goGetHTML5 = `<!doctype html><html><head><meta charset=utf-8>
+<meta name="go-import" content="gvisor.dev/gvisor git https://github.com/google/gvisor">
+<meta name="go-import" content="gvisor.dev/website git https://github.com/google/gvisor-website">
+<title>Go-get</title></head><body></html>`
+)
+
+// cronHandler wraps an http.Handler to check that the request is from the App
+// Engine Cron service.
+// See: https://cloud.google.com/appengine/docs/standard/go112/scheduling-jobs-with-cron-yaml#validating_cron_requests
+func cronHandler(h http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.Header.Get("X-Appengine-Cron") != "true" {
+			http.NotFound(w, r)
+			return
+		}
+		// Fallthrough.
+		h.ServeHTTP(w, r)
+	})
+}
+
+// wrappedHandler wraps an http.Handler.
+//
+// If the query parameters include go-get=1, then we redirect to a single
+// static page that allows us to serve arbitrary Go packages.
+func wrappedHandler(h http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		gg, ok := r.URL.Query()["go-get"]
+		if ok && len(gg) == 1 && gg[0] == "1" {
+			// Serve a trivial html page.
+			w.Write([]byte(goGetHTML5))
+			return
+		}
+		// Fallthrough.
+		h.ServeHTTP(w, r)
+	})
+}
+
+// redirectWithQuery redirects to the given target url preserving query parameters.
+func redirectWithQuery(w http.ResponseWriter, r *http.Request, target string) {
+	url := target
+	if qs := r.URL.RawQuery; qs != "" {
+		url += "?" + qs
+	}
+	http.Redirect(w, r, url, http.StatusFound)
+}
+
+// hostRedirectHandler redirects the www. domain to the naked domain.
+func hostRedirectHandler(h http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if strings.HasPrefix(r.Host, "www.") {
+			// Redirect to the naked domain.
+			r.URL.Scheme = "https"  // Assume https.
+			r.URL.Host = r.Host[4:] // Remove the 'www.'
+			http.Redirect(w, r, r.URL.String(), http.StatusMovedPermanently)
+			return
+		}
+
+		if *projectId != "" && r.Host == *projectId+".appspot.com" && *customHost != "" {
+			// Redirect to the custom domain.
+			r.URL.Scheme = "https" // Assume https.
+			r.URL.Host = *customHost
+			http.Redirect(w, r, r.URL.String(), http.StatusMovedPermanently)
+			return
+		}
+		h.ServeHTTP(w, r)
+	})
+}
+
+// prefixRedirectHandler returns a handler that redirects to the given formated url.
+func prefixRedirectHandler(prefix, baseURL string) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if p := r.URL.Path; p == prefix {
+			// Redirect /prefix/ to /prefix.
+			http.Redirect(w, r, p[:len(p)-1], http.StatusFound)
+			return
+		}
+		id := r.URL.Path[len(prefix):]
+		if !validId.MatchString(id) {
+			http.Error(w, "Not found", http.StatusNotFound)
+			return
+		}
+		target := fmt.Sprintf(baseURL, id)
+		redirectWithQuery(w, r, target)
+	})
+}
+
+// redirectHandler returns a handler that redirects to the given url.
+func redirectHandler(target string) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		redirectWithQuery(w, r, target)
+	})
+}
+
+// redirectRedirects registers redirect http handlers.
+func registerRedirects(mux *http.ServeMux) {
+	if mux == nil {
+		mux = http.DefaultServeMux
+	}
+
+	for prefix, baseURL := range prefixHelpers {
+		p := "/" + prefix + "/"
+		mux.Handle(p, hostRedirectHandler(wrappedHandler(prefixRedirectHandler(p, baseURL))))
+	}
+
+	for path, redirect := range redirects {
+		mux.Handle(path, hostRedirectHandler(wrappedHandler(redirectHandler(redirect))))
+	}
+}
+
+// registerStatic registers static file handlers
+func registerStatic(mux *http.ServeMux, staticDir string) {
+	if mux == nil {
+		mux = http.DefaultServeMux
+	}
+	mux.Handle("/", hostRedirectHandler(wrappedHandler(http.FileServer(http.Dir(staticDir)))))
+}
+
+func envFlagString(name, def string) string {
+	if val := os.Getenv(name); val != "" {
+		return val
+	}
+	return def
+}
+
+var (
+	addr      = flag.String("http", envFlagString("HTTP", ":8080"), "HTTP service address")
+	staticDir = flag.String("static-dir", envFlagString("STATIC_DIR", "_site"), "static files directory")
+
+	// Uses the standard GOOGLE_CLOUD_PROJECT environment variable set by App Engine.
+	projectId  = flag.String("project-id", envFlagString("GOOGLE_CLOUD_PROJECT", ""), "The App Engine project ID.")
+	customHost = flag.String("custom-domain", envFlagString("CUSTOM_DOMAIN", "gvisor.dev"), "The application's custom domain.")
+)
+
+func main() {
+	flag.Parse()
+
+	registerRedirects(nil)
+	registerStatic(nil, *staticDir)
+
+	log.Printf("Listening on %s...", *addr)
+	log.Fatal(http.ListenAndServe(*addr, nil))
+}