fix(setup-origin): a name's own template survives renewal

scripts/setup-origin.sh

@@ -282,7 +282,16 @@ fi
 
 # ------------------------------------------------------------------ nginx
 
-step "writing the nginx server block"
+# A name can bring its own server block: /etc/moshpit/templates/<name>.conf
+# (MOSHPIT_TEMPLATE_DIR). Without it, a name whose site is a proxy to an app
+# (seo.rank, live.streaming) was rewritten back to the static webroot by the
+# next renewal, which re-runs this script. MOSHPIT_TEMPLATE, when set, still
+# wins, for a box whose every name is served the same way.
+NAME_TEMPLATE="${MOSHPIT_TEMPLATE_DIR:-/etc/moshpit/templates}/$NAME.conf"
+if [ -z "${MOSHPIT_TEMPLATE:-}" ] && [ -f "$NAME_TEMPLATE" ]; then
+  TEMPLATE="$NAME_TEMPLATE"
+fi
+step "writing the nginx server block from $TEMPLATE"
 CONF="$SITEDIR/$NAME"
 if [ "$DRY_RUN" = "0" ]; then
   mkdir -p "$SITEDIR" "$ENABLEDIR" "$WEBROOT"

tests/setup-origin-registry.test.ts

@@ -92,3 +92,17 @@ describe("moshpit-renew.sh", () => {
     assert.match(r.stdout, /1 renewed, 0 failed/);
   });
 });
+
+describe("setup-origin.sh — a name's own server block", () => {
+  test("a template named for the site is used, so a renewal keeps its proxy", async () => {
+    const dir = await tempDir();
+    const templates = join(dir, "templates");
+    await mkdir(templates, { recursive: true });
+    await writeFile(join(templates, "live.streaming.conf"), "server { server_name NAME; }\n");
+    const own = await sh(setup, ["live.streaming", "--dry-run"], { MOSHPIT_TEMPLATE_DIR: templates, MOSHPIT_TEMPLATE: "" });
+    assert.equal(own.code, 0, own.stderr);
+    assert.match(own.stderr + own.stdout, new RegExp(`server block from ${join(templates, "live.streaming.conf").replace(/[.*+?^${}()|[\]\\]/g, "\\$&")}`));
+    const other = await sh(setup, ["blue.eggs", "--dry-run"], { MOSHPIT_TEMPLATE_DIR: templates, MOSHPIT_TEMPLATE: "" });
+    assert.match(other.stderr + other.stdout, /server block from .*moshpit-origin\.conf/);
+  });
+});