Implement building ISO in RAM and automatic removal of build directory (#67)

* feat: Implement building ISO in RAM

* feat: Implement removing build directory

* README: Remove build directory by default

* Use mktemp to create work directory

Co-authored-by: Vasiliy Stelmachenok <92667539+ventureoo@users.noreply.github.com>

* Adapt cehcks for mktemp

* util-iso.sh: Fix typo

Co-authored-by: Vasiliy Stelmachenok <92667539+ventureoo@users.noreply.github.com>

* util-iso.sh: Ensure safe removal of directory by quoting variable

Co-authored-by: Vasiliy Stelmachenok <92667539+ventureoo@users.noreply.github.com>

* util-iso.sh: umount_fs first and then start removal

* util-iso.sh: Properly handle removal of work directory

---------

Co-authored-by: Vasiliy Stelmachenok <92667539+ventureoo@users.noreply.github.com>

README.md

@@ -10,6 +10,8 @@ buildiso is used to build CachyOS ISO.
 $ ./buildiso.sh -h
 Usage: buildiso [options]
     -c                 Disable clean work dir
+    -r                 Disable building in RAM on systems with more than 23GB RAM
+    -w                 Remove build directory (not the ISO) after ISO file is built
     -h                 This help
     -p <profile>       Buildset or profile [default: desktop]
     -v                 Verbose output to log file, show profile detail (-q)
@@ -34,7 +36,7 @@ cd cachyos-archiso
 
 ### Build
 ```bash
-sudo ./buildiso.sh -p desktop -v
+sudo ./buildiso.sh -p desktop -v -w
 ```
 
 As the result iso appears at the `out` folder

archiso/grub/grub.cfg

@@ -1,6 +1,6 @@
 # Defining the Version of the ISO. This line could be easy changed by a Script wich do that automatic before creating ISO self.
 # Default "GIT", because if somebody outside from the DEVs create a ISO, this ISO wouldnt have a specific Version number.
-CACHYOS_VERSION="250131"
+CACHYOS_VERSION="251016"
 
 if [ "${grub_platform}" == 'efi' ]; then
     bios_or_uefi='(UEFI)!'

buildiso.sh

@@ -20,10 +20,14 @@ outFolder="${src_dir}/out"
 build_list_iso="desktop"
 clean_first=true
 verbose=false
+build_in_ram=true
+remove_build_dir=false
 
 usage() {
     echo "Usage: ${0##*/} [options]"
     echo '    -c                 Disable clean work dir'
+    echo '    -r                 Disable building in RAM on systems with more than 23GB RAM'
+    echo '    -w                 Remove build directory (not the ISO) after ISO file is built'
     echo "    -p <profile>       Buildset or profile [default: ${build_list_iso}]"
     echo '    -v                 Verbose output to log file, show profile detail (-q)'
     echo '    -h                 This help'
@@ -34,12 +38,14 @@ usage() {
 
 orig_argv=("$@")
 
-opts='p:cvh'
+opts='p:cvhrw'
 
 while getopts "${opts}" arg; do
     case "${arg}" in
         c) clean_first=false ;;
         p) build_list_iso="$OPTARG" ;;
+        r) build_in_ram=false ;;
+        w) remove_build_dir=true ;;
         v) verbose=true ;;
         h|?) usage 0 ;;
         *) echo "invalid argument '${arg}'"; usage 1 ;;
@@ -52,6 +58,11 @@ timer_start=$(get_timer)
 
 #check_root "$0" "${orig_argv[@]}"
 
+# Build ISO in RAM if RAM amount is greater than 23GB. This would speed up build process and extend disk lifetime 
+if [[ "$build_in_ram" == "true" ]] && [[ $(grep MemTotal /proc/meminfo | awk '{print int($2/1024/1024)}') -gt 23 ]]; then
+    work_dir="$(mktemp -d --suffix="-cachyos-iso")"
+fi
+
 prepare_dir "${work_dir}"
 
 import ${src_dir}/util-iso.sh

util-iso.sh

@@ -212,6 +212,16 @@ run_build() {
         fi
     done
     show_elapsed_time "${FUNCNAME}" "${timer_start}"
+    if [[ "$build_in_ram" == "true" && "$remove_build_dir" == "false" ]]; then
+        msg "!!! Remember to remove $work_dir !!!"
+        msg2 "sudo rm -rf $work_dir"
+    fi
+    if [[ "$remove_build_dir" == "true" ]]; then
+        msg "Automatically removing build directory ($work_dir)..."
+        umount_fs
+        [ -d ${work_dir} ] && sudo rm -rf ${work_dir}
+        msg2 "Removed"
+    fi
 }
 
 gen_iso_fn(){