build_library: reformat the license file as json

This changes the format from:

    sys-apps/systemd-212-r8::coreos GPL-2 LGPL-2.1 MIT public-domain

to a JSON structure:

    [
      {
        "project": "sys-apps/systemd-212-r8::coreos",
        "license": ["GPL-2", "LGPL-2.1", "MIT", "public-domain"]
      }
    ]

We don't have to worry about the changing format because the previous
format was never published. This is designed to match the
bill-of-materials [1] format so that it can be consumed by the site.

[1]: https://github.com/coreos/license-bill-of-materials

build_library/build_image_util.sh

@@ -269,24 +269,76 @@ write_packages() {
 }
 
 # Generate a list of packages w/ their licenses in the format:
-#   sys-apps/systemd-212-r8::coreos GPL-2 LGPL-2.1 MIT public-domain
+#   [
+#     {
+#       "project": "sys-apps/systemd-212-r8::coreos",
+#       "license": ["GPL-2", "LGPL-2.1", "MIT", "public-domain"]
+#     }
+#   ]
 write_licenses() {
     info "Writing ${2##*/}"
-    local pkg lic
+    echo -n "[" > "$2"
+
+    local pkg pkg_sep
     for pkg in $(image_packages "$1" | sort); do
-        lic="$1/var/db/pkg/${pkg%%:*}/LICENSE"
+        local path="$1/var/db/pkg/${pkg%%:*}/LICENSE"
-        if [[ -f "$lic" ]]; then
+        local lic_str
-            echo "$pkg $(< "$lic")"
+        if [[ -f "$path" ]]; then
+            lic_str="$(< $path)"
         else
             # The package is not installed in $1 so get the license from
             # its ebuild
-            lic=$(portageq-${BOARD} metadata "${BOARD_ROOT}" ebuild \
+            lic_str=$(portageq-${BOARD} metadata "${BOARD_ROOT}" ebuild \
-                    "${pkg%%:*}" LICENSE 2>/dev/null ||:)
+                        "${pkg%%:*}" LICENSE 2>/dev/null ||:)
-            if [[ -n "$lic" ]]; then
+            if [[ -z "$lic_str" ]]; then
-                echo "$pkg $lic"
+                warn "No license found for ${pkg}"
+                continue
             fi
         fi
-    done > "$2"
+
+        [[ -n $pkg_sep ]] && echo ","
+        [[ -z $pkg_sep ]] && echo
+        pkg_sep="true"
+
+        # Build a list of the required licenses vs the one-of licenses
+        # For example:
+        #   GPL-3+ LGPL-3+ || ( GPL-3+ libgcc libstdc++ ) FDL-1.3+
+        #   required: GPL-3+ LGPL-3+ FDL-1.3+
+        #   one-of: GPL-3+ libgcc libstdc++
+        local req_lics=($(sed 's/|| ([^)]*)//' <<< $lic_str))
+        local opt_lics=($(sed 's/.*|| (\([^)]*\)).*/\1/' <<< $lic_str))
+
+        # Pick one of the one-of licenses, preferring a GPL license. Otherwise,
+        # pick the first.
+        local opt_lic=""
+        local lic
+        for lic in ${opt_lics[*]}; do
+            if [[ $lic =~ "GPL" ]]; then
+                opt_lic=$lic;
+                break
+            fi;
+        done
+        if [[ -z $opt_lic ]]; then
+            opt_lic=${opt_lics[0]}
+        fi
+
+        # Remove duplicate licenses
+        local lics=$(tr ' ' '\n' <<< "${req_lics[*]} ${opt_lic}" | sort --unique | tr '\n' ' ')
+
+        echo -n "  {\"project\": \"${pkg}\", \"licenses\": ["
+
+        local lic_sep=""
+        for lic in ${lics[*]}; do
+            [[ -n $lic_sep ]] && echo -n ", "
+            lic_sep="true"
+
+            echo -n "\"${lic}\""
+        done
+
+        echo -n "]}"
+    done >> "$2"
+
+    echo -e "\n]" >> "$2"
 }
 
 # Add an entry to the image's package.provided

build_library/dev_image_util.sh

@@ -90,7 +90,7 @@ create_dev_image() {
   local root_fs_dir="${BUILD_DIR}/rootfs"
   local image_contents="${image_name%.bin}_contents.txt"
   local image_packages="${image_name%.bin}_packages.txt"
-  local image_licenses="${image_name%.bin}_licenses.txt"
+  local image_licenses="${image_name%.bin}_licenses.json"
 
   start_image "${image_name}" "${disk_layout}" "${root_fs_dir}" "${update_group}"
 

build_library/ebuild_aci_util.sh

@@ -15,7 +15,7 @@ create_ebuild_aci_image() {
     local root_fs_dir="${BUILD_DIR}/rootfs"
     local image_contents="${image_name%.bin}_contents.txt"
     local image_packages="${image_name%.bin}_packages.txt"
-    local image_licenses="${image_name%.bin}_licenses.txt"
+    local image_licenses="${image_name%.bin}_licenses.json"
 
     start_image \
         "${image_name}" "${disk_layout}" "${root_fs_dir}" "${update_group}"

build_library/oem_aci_util.sh

@@ -22,7 +22,7 @@ create_oem_aci_image() {
     local root_fs_dir="${BUILD_DIR}/rootfs"
     local image_contents="${image_name%.bin}_contents.txt"
     local image_packages="${image_name%.bin}_packages.txt"
-    local image_licenses="${image_name%.bin}_licenses.txt"
+    local image_licenses="${image_name%.bin}_licenses.json"
 
     start_image \
         "${image_name}" "${disk_layout}" "${root_fs_dir}" "${update_group}"

build_library/prod_image_util.sh

@@ -65,7 +65,7 @@ create_prod_image() {
   local root_fs_dir="${BUILD_DIR}/rootfs"
   local image_contents="${image_name%.bin}_contents.txt"
   local image_packages="${image_name%.bin}_packages.txt"
-  local image_licenses="${image_name%.bin}_licenses.txt"
+  local image_licenses="${image_name%.bin}_licenses.json"
   local image_kernel="${image_name%.bin}.vmlinuz"
   local image_pcr_policy="${image_name%.bin}_pcr_policy.zip"
   local image_grub="${image_name%.bin}.grub"