[LTR] Infer kernel version from UPSTREAM_REF

Use the inferred kernel version to construct all of the other branch
references in the script.  This should allow an UPSTREAM_REF of
stable_6.18.y to be passed and the script to work the same way it does
today for 6.12

Author: bmastbergen

lt_rebase.sh

@@ -7,6 +7,15 @@ if [ -z "$UPSTREAM_REF" ]; then
     echo "UPSTREAM_REF not set, defaulting to $UPSTREAM_REF"
 fi
 
+# Extract kernel version from UPSTREAM_REF (e.g., stable_6.12.y -> 6.12)
+KERNEL_VERSION=$(echo "$UPSTREAM_REF" | sed -E 's/.*_([0-9]+\.[0-9]+)\.y/\1/')
+if [ -z "$KERNEL_VERSION" ]; then
+    echo "Failed to extract kernel version from UPSTREAM_REF: $UPSTREAM_REF"
+    echo "Expected format: stable_X.Y.y (e.g., stable_6.12.y)"
+    exit 1
+fi
+echo "Detected kernel version: $KERNEL_VERSION"
+
 git fetch --all
 git show-ref --verify --quiet refs/remotes/origin/$UPSTREAM_REF
 if [ $? -ne 0 ]; then
@@ -20,36 +29,36 @@ if [ $? -ne 0 ]; then
     exit 1
 fi
 
-git show-ref --verify --quiet refs/heads/ciq-6.12.y-next
-if [ $? -eq 0 ]; then 
-    echo "ciq-6.12.y-next branch already exists, please check status of remote and local branches"
+git show-ref --verify --quiet refs/heads/ciq-${KERNEL_VERSION}.y-next
+if [ $? -eq 0 ]; then
+    echo "ciq-${KERNEL_VERSION}.y-next branch already exists, please check status of remote and local branches"
     exit 1
 fi
 
-git show-ref --verify --quiet refs/heads/{automation_tmp}_ciq-6.12.y-next
-if [ $? -eq 0 ]; then 
-    echo "{automation_tmp}_ciq-6.12.y-next branch already exists, please check status of remote and local branches"
+git show-ref --verify --quiet refs/heads/{automation_tmp}_ciq-${KERNEL_VERSION}.y-next
+if [ $? -eq 0 ]; then
+    echo "{automation_tmp}_ciq-${KERNEL_VERSION}.y-next branch already exists, please check status of remote and local branches"
     exit 1
 fi
 
-git checkout -b ciq-6.12.y-next $UPSTREAM_REF
+git checkout -b ciq-${KERNEL_VERSION}.y-next $UPSTREAM_REF
 if [ $? -ne 0 ]; then
-    echo "Failed to checkout ciq-6.12.y-next, please check status of remote and local branches"
+    echo "Failed to checkout ciq-${KERNEL_VERSION}.y-next, please check status of remote and local branches"
     exit 1
 fi
-git checkout ciq-6.12.y
+git checkout ciq-${KERNEL_VERSION}.y
 if [ $? -ne 0 ]; then
-    echo "Failed to checkout ciq-6.12.y, please check status of remote and local branches"
+    echo "Failed to checkout ciq-${KERNEL_VERSION}.y, please check status of remote and local branches"
     exit 1
 fi
-git checkout -b {automation_tmp}_ciq-6.12.y-next
+git checkout -b {automation_tmp}_ciq-${KERNEL_VERSION}.y-next
 if [ $? -ne 0 ]; then
-    echo "Failed to checkout {automation_tmp}_ciq-6.12.y-next, please check status of remote and local branches"
+    echo "Failed to checkout {automation_tmp}_ciq-${KERNEL_VERSION}.y-next, please check status of remote and local branches"
     exit 1
 fi
-git rebase ciq-6.12.y-next
+git rebase ciq-${KERNEL_VERSION}.y-next
 if [ $? -ne 0 ]; then
-    echo "Failed to rebase {automation_tmp}_ciq-6.12.y-next, please check status of remote and local branches"
+    echo "Failed to rebase {automation_tmp}_ciq-${KERNEL_VERSION}.y-next, please check status of remote and local branches"
     exit 1
 fi