1 files changed, 66 insertions, 0 deletions
diff --git a/pkgs/by-name/ta/tails-iso/update.sh b/pkgs/by-name/ta/tails-iso/update.sh
new file mode 100755
index 00000000..5a2a81cd
--- /dev/null
+++ b/pkgs/by-name/ta/tails-iso/update.sh
@@ -0,0 +1,66 @@
+#! /usr/bin/env sh
+
+set -e
+
+tmpHomePath="$(mktemp -d "${TMPDIR:-/tmp}/nix-prefetch-url-XXXXXXXXXX")"
+cleanup() {
+    chmod -R u+w "$tmpHomePath"
+    rm -rf "$tmpHomePath"
+}
+trap cleanup EXIT
+
+info() {
+    echo "$1" 1>&2
+}
+
+# Returns a name based on the url and reference
+#
+# This function needs to be in sync with nix's fetchgit implementation
+# of urlToName() to re-use the same nix store paths.
+url_to_name() {
+    url=$1
+
+    basename "$url" .git | cut -d: -f2
+}
+
+get_sha256() {
+    url="$1"
+    storePathName="$(url_to_name "$url")"
+    hashType="sha256"
+
+    tmpOut="$tmpHomePath/$storePathName"
+    info "Prefetching '$url'..."
+
+    curl --follow "$url" >"$tmpOut"
+
+    # Compute the hash.
+    hash=$(nix-hash --flat --type "$hashType" --sri "$tmpOut")
+
+    # Add the downloaded file to the Nix store.
+    finalPath=$(nix-store --add-fixed "$hashType" "$tmpOut")
+
+    info "  -> Downloaded to '$finalPath'"
+    echo "$hash"
+}
+
+old_version="$(jq .version --raw-output <./files.json)"
+new_version="$(curl --follow https://download.tails.net/tails/stable/ 2>/dev/null | html2text -links | grep --regexp='\s*[0-9]\. tails-amd64-' | sed 's/\s*[0-9]\. tails-amd64-\(.*\)\//\1/')"
+
+if [ "$old_version" = "$new_version" ]; then
+    # No need to update.
+    info exit 0
+fi
+
+final_version="amd64-$new_version"
+
+cat <<EOF | jq . | tee ./files.json
+{
+    "version": "$new_version",
+    "files": {
+        "iso.sig": "$(get_sha256 "https://tails.net/torrents/files/tails-$final_version.iso.sig")",
+        "iso": "$(get_sha256 "https://download.tails.net/tails/stable/tails-$final_version/tails-$final_version.iso")"
+    }
+}
+EOF
+
+# vim: ft=sh