Compare prerelease versions correctly for updates

install.sh

@@ -222,20 +222,60 @@ release_latest_tag_download_url() {
   esac
 }
 
-version_part() {
+version_core() {
+  value="${1#v}"
+  value="${value%%+*}"
+  printf '%s\n' "${value%%-*}"
+}
+
+version_prerelease() {
+  value="${1#v}"
+  value="${value%%+*}"
+  case "$value" in
+    *-*) printf '%s\n' "${value#*-}" ;;
+    *) printf '\n' ;;
+  esac
+}
+
+version_core_part() {
   version="$1"
   index="$2"
-  printf '%s\n' "$version" \
+  version_core "$version" \
     | sed 's/[^0-9][^0-9]*/ /g' \
     | awk -v index="$index" '{ value=$index; if (value == "") value=0; print value }'
 }
 
+prerelease_less_than() {
+  left="$1"
+  right="$2"
+  if [ -z "$left" ] && [ -z "$right" ]; then
+    return 1
+  fi
+  if [ -z "$left" ]; then
+    return 1
+  fi
+  if [ -z "$right" ]; then
+    return 0
+  fi
+  if [ "$left" = "$right" ]; then
+    return 1
+  fi
+  left_rc="$(printf '%s\n' "$left" | sed -n 's/^[Rr][Cc]\([0-9][0-9]*\)$/\1/p')"
+  right_rc="$(printf '%s\n' "$right" | sed -n 's/^[Rr][Cc]\([0-9][0-9]*\)$/\1/p')"
+  if [ -n "$left_rc" ] && [ -n "$right_rc" ]; then
+    [ "$left_rc" -lt "$right_rc" ]
+    return
+  fi
+  first="$(printf '%s\n%s\n' "$left" "$right" | LC_ALL=C sort | sed -n '1p')"
+  [ "$first" = "$left" ]
+}
+
 version_less_than() {
   left="$1"
   right="$2"
   for index in 1 2 3 4 5 6 7 8; do
-    lpart="$(version_part "$left" "$index")"
-    rpart="$(version_part "$right" "$index")"
+    lpart="$(version_core_part "$left" "$index")"
+    rpart="$(version_core_part "$right" "$index")"
     if [ "$lpart" -lt "$rpart" ]; then
       return 0
     fi
@@ -243,7 +283,7 @@ version_less_than() {
       return 1
     fi
   done
-  return 1
+  prerelease_less_than "$(version_prerelease "$left")" "$(version_prerelease "$right")"
 }
 
 current_source_version() {