Hi Sergey On Fri, May 19, 2023 at 4:02 AM Sergey Bugaev <buga...@gmail.com> wrote:
> Hi, > > On Fri, May 19, 2023 at 9:43 AM Flávio Cruz <flavioc...@gmail.com> wrote: > > I have made changes so that it does daily builds and I'm able to boot > small programs. However, I haven't had the time to boot programs built > against Glibc. How do you package and boot the static binaries using a > ramdisk? I've been reading the other threads about the Guix/rumpkernel so I > might be able to piece something together and try it this weekend. > > You just put the entirety of the root filesystem (containing /usr, > /bin, /lib, /hurd, and so on) as an ext2 image into a *file* that you > place onto the actual drive (a CD disk in my case), and then you ask > GRUB to load the file from the drive into memory, tell gnumach to make > a ramdisk device out of it (you'll need to apply [0]), and tell ext2fs > to use that device. Here's the relevant piece of my grub config > script: > > [0]: > https://salsa.debian.org/hurd-team/gnumach/-/blob/master/debian/patches/50_initrd.patch > > multiboot /boot/gnumach console=com0 > module /boot/initrd.ext2 initrd.ext2 '$(ramdisk-create)' > module /sbin/ext2fs.static ext2fs > --multiboot-command-line='${kernel-command-line}' --readonly > --host-priv-port='${host-port}' --device-master-port='${device-port}' > --exec-server-task='${exec-task}' --kernel-task='${kernel-task}' -T > device rd0 '$(fs-task=task-create)' '$(prompt-task-resume)' > module /lib/ld.so.1 ld.so.1 /hurd/exec > --device-master-port='${device-port}' '$(exec-task=task-create)' > boot > > (I should probably change it to not hardcode 'rd0', but whatever). > Note that /boot/gnumach, /boot/initrd.ext2, /sbin/ext2fs.static, and > /lib/ld.so.1 are all paths inside the CD image (those are going to be > loaded by GRUB), and /boot/initrd.ext2 is the ext2 filesystem image > containing the actual Hurd root. /hurd/exec however is already a path > inside the fs image -- this is where ld.so (not grub) is going to load > the exec server from. The only static binary here is ext2fs.static, > the rest are all dynamically linked. > > Then in /libexec/console-run (inside the filesystem image), I have > written the following: > > #! /bin/sh > > settrans -ac /dev/mach-console /hurd/streamio console > exec <>/dev/mach-console >&0 2>&0 > echo Hello from /bin/sh! > exec /bin/sh -i > > (If you're going to do the same, don't forget to create the > /dev/mach-console node beforehand, since the fs is read-only.) I also > had to patch streamio a little to do the \r -> \n conversion like > glibc already does in devstream: > > diff --git a/trans/streamio.c b/trans/streamio.c > index 272a002c..0af1aea3 100644 > --- a/trans/streamio.c > +++ b/trans/streamio.c > @@ -500,6 +500,9 @@ trivfs_S_io_read (struct trivfs_protid *cred, > cred->po->openmodes & O_NONBLOCK); > pthread_mutex_unlock (&global_lock); > *data_len = data_size; > + for (size_t i = 0; i < data_size; i++) > + if ((*data)[i] == '\r') > + (*data)[i] = '\n'; > return err; > } > > (maybe I should also add echoing of input characters in the same way, > which is also what glibc's devstream does -- otherwise currently I > don't see what I'm typing on the console). > > Make sure to use the very latest glibc (Samuel has already pushed all > of my patches upstream!) + the BRK_START hack. > Thanks for the instructions. I was able to make it work and pushed my changes to Github. For people that might want to try out the new port using https://github.com/flavioc/cross-hurd, the following will download the packages and build a disk image with the ram disk: $ export CPU=x86_64 $ bash download.sh && bash bootstrap.sh && bash compile.sh && bash create-initrd.sh Then, to run qemu: $ bash start-qemu-debug.sh > Sergey >
