core: 修改主硬盘查找逻辑

排除只读盘，vda 放前面

redhat.cfg

@@ -9,7 +9,7 @@ reboot
 %include /tmp/include-url-command
 
 # 分区
-ignoredisk --only-use="sda|hda|xda|vda|xvda|nvme0n1"
+%include /tmp/include-disk-only-use
 %include /tmp/include-bootloader
 clearpart --all --initlabel
 reqpart # 如果需要，自动创建 efi 或 biosboot 分区
@@ -34,6 +34,19 @@ selinux --disabled
 
 ##############################################
 %pre
+get_xda() {
+    # 排除只读盘，vda 放前面
+    # 有的机器有sda和vda，vda是主硬盘，另一个盘是只读
+    for _xda in vda xda sda hda xvda nvme0n1; do
+        if [ -e "/sys/class/block/$_xda/ro" ] &&
+            [ "$(cat /sys/class/block/$_xda/ro)" = 0 ]; then
+            echo $_xda
+            return
+        fi
+    done
+    return 1
+}
+
 distro=$(awk -F: '{ print $3 }' </etc/system-release-cpe)
 releasever=$(awk -F: '{ print $5 }' </etc/system-release-cpe)
 
@@ -44,6 +57,10 @@ for var in $(grep -o "\b$prefix\.[^ ]*" /proc/cmdline | xargs); do
     eval "$(echo $var | sed -E "s/$prefix\.([^=]*)=(.*)/\1='\2'/")"
 done
 
+# 只使用主硬盘
+include=/tmp/include-disk-only-use
+echo "ignoredisk --only-use=$(get_xda)" >$include
+
 # 设置 tty
 include=/tmp/include-bootloader
 console_cmdline=$(wget $confhome/ttys.sh -O- | sh -s console=)