feat: add free disk space startup check

kiauh.sh

@@ -86,6 +86,7 @@ function kiauh_update_dialog() {
 }
 
 check_euid
+check_free_space
 init_logfile
 set_globals
 kiauh_update_dialog

scripts/utilities.sh

@@ -28,6 +28,29 @@ function check_euid() {
   fi
 }
 
+function check_free_space() {
+  local mount_free mb_rec=2048
+  local mount_check_regex='^/($|bin|etc|home|lib|mnt|opt|root|sbin|tmp|usr|var)' # all root dirs possibly relevant to software install
+  for mount_check in $(cat /etc/mtab | grep '^/dev' | cut -d ' ' -f 2 | grep -E '${mount_check_regex}'); do
+    mount_free=$(($(df -Pk ${mount_check} | sed 1d | grep -v used | awk '{ print $4 "\t" }')/1024))
+    if [[ ${mount_free} -lt ${mb_req} ]]; then
+      local yn
+      while true; do
+        echo -e "${yellow}Heads up! Free disk space in ${white}${mount_check}${yellow} is only ${white}${mount_free} MB${yellow}.${white}"
+        read -p "${yellow}You may run into errors installing or updating software that uses this mountpoint. Proceed? (y|N): ${white}" yn
+        case "${yn}" in
+          Y|y|Yes|yes)
+            break;;
+          N|n|No|no|"")
+            exit 1;;
+          *)
+            echo -e "${red}Please answer "y" or "n"${white}";;
+        esac
+      done
+    fi
+  done
+}
+
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