bazel/release: Fixes for versions hashing (envoyproxy#36630)

Signed-off-by: Ryan Northey <[email protected]>

bazel/generate_release_hash.sh

@@ -2,16 +2,9 @@
 
 set -e -o pipefail
 
-ENVOY_SRCDIR="${1}"
 
-if [[ ! -e "$ENVOY_SRCDIR" ]]; then
-    echo "Unable to find Envoy src dir: ${ENVOY_SRCDIR}" >&2
-    exit 1
-fi
-
-git -C "$ENVOY_SRCDIR" fetch --tags
-
-git -C "$ENVOY_SRCDIR" tag --list 'v[0-9]*.[0-9]*.[0-9]*' \
-    | grep -E '^v[0-9]+\.[0-9]+\.[0-9]+$' \
+git ls-remote --tags https://github.com/envoyproxy/envoy \
+    | grep -E 'refs/tags/v[0-9]+\.[0-9]+\.[0-9]+$' \
     | sort -u \
-    | sha256sum
+    | sha256sum \
+    | cut -d ' ' -f 1

bazel/repo.bzl

@@ -68,7 +68,7 @@ envoy_entry_point(
 
 sh_binary(
     name = "generate_release_hash",
-    srcs = ["generate_release_hash.sh"],
+    srcs = ["@envoy//bazel:generate_release_hash.sh"],
     visibility = ["//visibility:public"],
 )
 
@@ -80,11 +80,11 @@ genrule(
     name = "default_release_hash",
     outs = ["default_release_hash.txt"],
     cmd = """
-    $(location @envoy//bazel:generate_release_hash.sh) %s > $@
-    """ % PATH,
+    $(location @envoy_repo//:generate_release_hash) > $@
+    """,
     stamp = True,
     tags = ["no-remote-exec"],
-    tools = ["@envoy//bazel:generate_release_hash.sh"],
+    tools = ["@envoy_repo//:generate_release_hash"],
 )
 
 label_flag(