Setup Debian riscv32 sbuild

1. Pre-requisites

Assuming the build environment is on an amd64 host, you need to install the components that support riscv32 in advance:

a. mmdebstrap

b. arch-test

c. dpkg

2. Build riscv32 chroot

sudo sbuild-createchroot --debootstrap=mmdebstrap --arch=riscv32  \
 --include=debian-ports-archive-keyring,ca-certificates,apt,apt-transport-https,init-system-helpers,debconf,usrmerge  \
 --make-sbuild-tarball=/srv/sid-riscv32-sbuild.tgz   \
 sid /tmp/chroots/sid-riscv32-sbuild/  \
http://vimer.f3322.net:63017/yubos-repo/

After you created riscv32 chroot then you can replace riscv32 chroot tar with mmdebstrap directly:

sudo mmdebstrap --arch=riscv32 \
 --variant=buildd --include=ca-certificates,apt-transport-https,init-system-helpers,usrmerge,apt,systemd,udev,debian-ports-archive-keyring  \
 sid sid-riscv32-yubos-rootfs.tar.xz \
 "deb http://vimer.f3322.net:63017/yubos-repo/ sid main" \
 "deb http://vimer.f3322.net:63017/yubos-base-all/ sid main"

Explanation： The yubos-repo/ is riscv32 packages repo, yubos-base-all/ is all packages repo.