From c41abe2d3e64f17f29125fd939a364afd2c9f5c3 Mon Sep 17 00:00:00 2001
From: xopenwrt <xopenwrtnew@protonmail.com>
Date: Mon, 29 Jun 2026 22:14:08 +0800
Subject: [PATCH] fix release tag comparison

---
 AI_CHANGELOG_RELEASE_TAG_COMPARISON.md | 13 +++++++++++++
 Scripts/AutoBuild_Upcheck.sh           | 21 ++++++---------------
 2 files changed, 19 insertions(+), 15 deletions(-)
 create mode 100644 AI_CHANGELOG_RELEASE_TAG_COMPARISON.md

diff --git a/AI_CHANGELOG_RELEASE_TAG_COMPARISON.md b/AI_CHANGELOG_RELEASE_TAG_COMPARISON.md
new file mode 100644
index 0000000..9d54699
--- /dev/null
+++ b/AI_CHANGELOG_RELEASE_TAG_COMPARISON.md
@@ -0,0 +1,13 @@
+# AI Modification Log: Release Tag Comparison
+
+Date: 2026-06-29
+
+## Change
+
+- Updated `Scripts/AutoBuild_Upcheck.sh` release tag selection to filter tags as `vYYYY-MM-DD`.
+- Sorted release tags with `sort -V` and selected the latest tag older than `${NOW_DATA_VERSION}`.
+- Normalized the fallback tag to `v2023-01-01`.
+
+## Reason
+
+The old logic compared release tags lexically and used a non-normalized `v2023-1-1` fallback. Filtering and version sorting make date-tag selection predictable.
diff --git a/Scripts/AutoBuild_Upcheck.sh b/Scripts/AutoBuild_Upcheck.sh
index ffa1010..4dc5e83 100644
--- a/Scripts/AutoBuild_Upcheck.sh
+++ b/Scripts/AutoBuild_Upcheck.sh
@@ -96,22 +96,13 @@ done < "build_package.log"
         # export GITHUB_WORKSPACE=$GITHUB_WORKSPACE
 RELEASE_REPOSITORY="${GITHUB_REPOSITORY:-X-OpenWrt/X-OpenWrt-Dev}"
 wget "https://api.github.com/repos/${RELEASE_REPOSITORY}/releases" -O releases.json
-cat releases.json | jq  '.[].tag_name' -r > version.old
+jq -r '.[].tag_name' releases.json | grep -E '^v[0-9]{4}-[0-9]{2}-[0-9]{2}$' | sort -V > version.old
 echo ${NOW_DATA_VERSION}
-diff_version=v2023-1-1
-while read -r last_version
-do
-        if [[ "$last_version" != "AutoUpdate" ]]
-        then
-                if [[ "$last_version" < ${NOW_DATA_VERSION} ]]
-                then
-                        if [[ "$last_version" > ${diff_version} ]]
-                        then
-                                diff_version=$last_version
-                        fi
-                fi
-        fi
-done < "version.old"
+diff_version=$(awk -v current="${NOW_DATA_VERSION}" '$0 < current { previous=$0 } END { print previous }' version.old)
+if [[ -z "${diff_version}" ]]
+then
+        diff_version=v2023-01-01
+fi
 wget -O ${1}_build_pkg_ver_old.log "https://github.com/${RELEASE_REPOSITORY}/releases/download/${diff_version}/${1}_build_pkg_ver.log"
 
 # Check_build_Version "LINUX_VERSION=${X_LINUX_VERSION}" ${1}