5859

Move script to create a Linux-based boot image into a sub-directory.

Readme.md

@@ -149,13 +149,13 @@ work on a cloud server.)
 
 You can also package up SubX binaries with a Linux kernel and run them on
 either Qemu or [a cloud server that supports custom images](http://akkartik.name/post/iso-on-linode).
-(Takes 12 minutes with 8GB RAM. Requires 12 million LoC of C for the Linux
+(Takes 12 minutes with 2GB RAM. Requires 12 million LoC of C for the Linux
 kernel; that number will gradually go down.)
 
   ```sh
   $ sudo apt install build-essential flex bison wget libelf-dev libssl-dev xorriso
-  $ ./gen_linux_iso init.linux apps/ex6.subx
-  $ qemu-system-x86_64 -m 256M -cdrom mu.iso -boot d
+  $ tools/iso/linux init.linux apps/ex6.subx
+  $ qemu-system-x86_64 -m 256M -cdrom mu_linux.iso -boot d
   ```
 
 ## What it looks like

tools/iso/linux

@@ -2,7 +2,7 @@
 # Build one or more .subx files into an ELF binary, and package it up into a
 # bootable ISO image with a Linux kernel.
 #
-# Must be run on Linux.
+# Must be run on Linux, and from the top-level mu/ directory.
 #
 # Dependencies:
 #   apt install build-essential flex bison wget libelf-dev libssl-dev xorriso
@@ -20,7 +20,6 @@ fi
 echo "=== building SubX binary"
 ./translate_subx $*
 mv a.elf init
-chmod +x init
 
 echo "=== constructing initramfs out of SubX binary"
 rm -rf tmp_linux/isoimage
@@ -45,7 +44,7 @@ echo "=== unpacking syslinux"
 tar xf tmp_linux/syslinux-*.tar.xz -C tmp_linux
 
 mkdir -p tmp_linux/isoimage/boot/syslinux
-cp syslinux.cfg \
+cp tools/iso/syslinux.cfg \
    tmp_linux/syslinux-*/bios/core/isolinux.bin \
    tmp_linux/syslinux-*/bios/com32/elflink/ldlinux/ldlinux.c32 \
    tmp_linux/isoimage/boot/syslinux