Add notice of inclusion of third-party code

(imported from commit 62d141e6ebd3368bd1cb3154d6903f9408f2b77c)

tools/update-prod-static

@@ -4,6 +4,11 @@
 
 cd "$(dirname "$0")"/..
 
+if ! which sponge >/dev/null; then
+    echo 'Install the moreutils package.' >&2
+    exit 1
+fi
+
 # Redirect output to a log file (most recent run only)
 exec >update-prod-static.log
 
@@ -27,6 +32,11 @@ rm -rf prod-static/serve-new
 mkdir -p prod-static/serve-new
 cp -r prod-static/collected/{favicon.ico,robots.txt,html,images,third,min,audio} prod-static/serve-new/
 
+# Prepend the third-party code notice to JavaScript and CSS files.
+for f in prod-static/serve-new/min/*.{js,css}; do
+    cat zephyr/static/header.txt $f | sponge $f
+done
+
 # Sync the new directory to the one nginx actually serves.
 # Hopefully this doesn't race too badly for clients loading
 # right as a deploy happens.

zephyr/static/header.txt

@@ -0,0 +1,9 @@
+/*
+  Some of the software provided in this file may be offered under an open source
+  license. If some of the software in this file is offered under an open source
+  license, information about that license will appear in this file.
+
+  All other software provided in this file is
+  Copyright (c) 2012-2013 Humbug, Inc. and is provided under the license
+  described in the Humbug Terms of Service: https://humbughq.com/terms
+ */