redhat: 修复两步安装下el8卡在安装界面的bug

redhat.cfg

@@ -49,19 +49,21 @@ done
 include=/tmp/include-packages-for-resize
 touch $include
 if [ -e /dev/disk/by-label/installer ]; then
-    # 1g内存下，安装器默认开启了zram ，但安装f38还是不够内存，所以还要开启swap
-    mkdir /installer
-    mount /dev/disk/by-label/installer /installer
-    mount /dev/disk/by-label/installer /installer -o remount,rw
-    swapfile=/installer/swapfile
-    if command -v fallocate; then
-        fallocate -l 1GiB $swapfile
-    else
-        dd if=/dev/zero of=$swapfile bs=1MiB count=1024
+    # 1g内存下，安装器默认开启了zram ，但安装f38还是不够内存
+    # 具体表现为不断重启安装界面，所以还要开启swap
+    ram_size=$(lsmem -b 2>/dev/null | grep 'Total online memory:' | awk '{ print $NF/1024/1024 }')
+    if [ -z $ram_size ] || [ $ram_size -le 1024 ]; then
+        mount /dev/disk/by-label/installer /run/install/repo -o remount,rw
+        swapfile=/run/install/repo/swapfile
+        if command -v fallocate; then
+            fallocate -l 1G $swapfile
+        else
+            dd if=/dev/zero of=$swapfile bs=1M count=1024
+        fi
+        chmod 0600 $swapfile
+        mkswap $swapfile
+        swapon $swapfile
     fi
-    chmod 0600 $swapfile
-    mkswap $swapfile
-    swapon $swapfile
 
     # feroda 默认不包含 cronie
     echo cronie >>$include