Initial commit with a very basic musl libc, static busybox, and dynamic openrc install

Author: bensallen

Diff for: .gitignore

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+initramfs/.install
+initramfs/.build

Diff for: README.md

@@ -1 +1,7 @@
-# warewulf-bootstrap
+# warewulf-bootstrap
+
+## Testing as a container with systemd-nspawn 
+
+```
+sudo systemd-nspawn --register=false --network-veth -bD initramfs/.install/
+```

Diff for: TODO

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+- [ ] Openrc service to parse /proc/cmdline to populate:
+    - [ ] /etc/conf.d/network
+

Diff for: build.sh

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+#!/bin/bash
+
+set -o errexit
+set -o nounset
+set -o pipefail
+
+MUSL_VERS=1.1.14
+BUSYBOX_VERS=1.24.2
+OPENRC_VERS=0.21
+
+BASE=$(dirname $(readlink -f $0))
+mkdir -p $BASE/initramfs
+mkdir -p $BASE/initramfs/3rd_party/MIT
+mkdir -p $BASE/initramfs/3rd_party/GPL
+
+INSTALLROOT="${BASE}/initramfs/.install"
+mkdir -p "${INSTALLROOT}"
+BUILDROOT="${BASE}/initramfs/.build"
+mkdir -p "${BUILDROOT}"
+KHDR_BASE=/usr
+
+### MUSL-C ###
+cd "${BASE}/initramfs/3rd_party/MIT"
+if [ ! -e "${BASE}/initramfs/3rd_party/MIT/musl-${MUSL_VERS}.tar.gz" ]; then
+    curl -O https://www.musl-libc.org/releases/musl-${MUSL_VERS}.tar.gz
+fi
+
+tar -C "${BUILDROOT}" -xf musl-${MUSL_VERS}.tar.gz
+cd "${BUILDROOT}/musl-${MUSL_VERS}"
+./configure \
+    --disable-wrapper \
+    --prefix=/usr \
+    --sysconfdir=/etc \
+    --localstatedir=/var \
+    --syslibdir=/lib \
+    --includedir="/../.build/include"
+make -j2
+
+make DESTDIR="${INSTALLROOT}" install
+LDSO=$(make -f Makefile --eval "$(echo -e 'print-ldso:\n\t@echo $$(basename $(LDSO_PATHNAME))')" print-ldso)
+mv -f "${INSTALLROOT}/usr/lib/libc.so" "${INSTALLROOT}/lib/${LDSO}"
+ln -sf "../../lib/${LDSO}" "${INSTALLROOT}/usr/lib/libc.so"
+mkdir -p "${INSTALLROOT}/usr/bin"
+ln -sf "../../lib/${LDSO}" "${INSTALLROOT}/usr/bin/ldd"
+
+mkdir -p "${BUILDROOT}/bin" "${BUILDROOT}/etc"
+
+sh "${BUILDROOT}/musl-${MUSL_VERS}/tools/musl-gcc.specs.sh" "${BUILDROOT}/include" "${INSTALLROOT}/usr/lib" "/lib/${LDSO}" > "${BUILDROOT}/etc/musl-gcc.specs"
+
+cat <<EOF > "${BUILDROOT}/bin/musl-gcc"
+#!/bin/sh
+exec "\${REALGCC:-gcc}" "\$@" -specs "${BUILDROOT}/etc/musl-gcc.specs"
+EOF
+
+chmod +x "${BUILDROOT}/bin/musl-gcc"
+
+PATH="${BUILDROOT}/bin":$PATH
+
+cd "${BUILDROOT}/bin"
+
+# TODO: Using binutils from the build host for now
+ln -s `which ar` musl-ar
+ln -s `which strip` musl-strip
+
+# TODO: Using linux-headers from the buildhost for now
+cd "${BUILDROOT}/include"
+ln -s "${KHDR_BASE}/include/linux" linux
+ln -s "${KHDR_BASE}/include/mtd" mtd
+if [ -d "${KHDR_BASE}/include/asm" ]
+then
+  ln -s "${KHDR_BASE}/include/asm" asm
+else
+    ln -s "${KHDR_BASE}/include/asm-generic" asm
+fi
+ln -s "${KHDR_BASE}/include/asm-generic" asm-generic
+
+### Busybox (static) ###
+cd "${BASE}/initramfs/3rd_party/GPL"
+if [ ! -e "${BASE}/initramfs/3rd_party/GPL/busybox-${BUSYBOX_VERS}.tar.bz2" ]; then
+    curl -O https://www.busybox.net/downloads/busybox-${BUSYBOX_VERS}.tar.bz2
+fi
+
+tar -C "${BUILDROOT}" -xf busybox-${BUSYBOX_VERS}.tar.bz2
+cd "${BUILDROOT}/busybox-${BUSYBOX_VERS}"
+cp "${BASE}/busybox.config" .config
+sed -i -e "s/CONFIG_EXTRA_COMPAT=y/CONFIG_EXTRA_COMPAT=n/" \
+       -e "s/.*CONFIG_CROSS_COMPILER_PREFIX.*/CONFIG_CROSS_COMPILER_PREFIX=\"musl-\"/" \
+       -e "s|.*CONFIG_PREFIX.*|CONFIG_PREFIX=\"${INSTALLROOT}\"|" \
+       -e "s/.*CONFIG_PIE.*/\# CONFIG_PIE is not set/" \
+       -e "s/.*CONFIG_INSTALL_APPLET_DONT.*/\# CONFIG_INSTALL_APPLET_DONT is not set/" \
+       -e "s/.*CONFIG_STATIC.*/CONFIG_STATIC=y/" \
+       -e "s/.*CONFIG_INSTALL_APPLET_SYMLINKS.*/CONFIG_INSTALL_APPLET_SYMLINKS=y/" \
+       .config
+
+make V=1 -j2
+make install
+
+### OpenRC ###
+cd "${BASE}/initramfs/3rd_party/MIT"
+if [ ! -e "${BASE}/initramfs/3rd_party/MIT/openrc-${OPENRC_VERS}.tar.gz" ]; then
+    curl -L -o openrc-${OPENRC_VERS}.tar.gz https://github.com/OpenRC/openrc/archive/${OPENRC_VERS}.tar.gz
+fi
+
+tar -C "${BUILDROOT}" -xf openrc-${OPENRC_VERS}.tar.gz
+cd "${BUILDROOT}/openrc-${OPENRC_VERS}"
+
+make install \
+    LIBNAME=lib \
+    DESTDIR="${INSTALLROOT}" \
+    MKNET=yes \
+    MKPKGCONFIG=no \
+    MKSTATICLIBS=no \
+    MKTOOLS=yes \
+    LOCAL_PREFIX=/usr/local \
+    BRANDING=\"Warewulf/$(uname -s)\" \
+    CC=musl-gcc 
+
+# systemd-nspawn needs os-release
+echo 'NAME="Warewulf 4.0 Bootstrap"' > "${INSTALLROOT}/etc/os-release"
+
+cat <<EOF > "${INSTALLROOT}/etc/inittab"
+# /etc/inittab
+
+::sysinit:/sbin/openrc sysinit
+::sysinit:/sbin/openrc boot
+::wait:/sbin/openrc default
+
+# Set up a couple of getty's
+console::respawn:/sbin/getty 38400 /dev/console
+
+# Put a getty on the serial port
+#ttyS0::respawn:/sbin/getty -L ttyS0 115200 vt100
+#ttyS1::respawn:/sbin/getty -L ttyS1 115200 vt100
+
+# Stuff to do for the 3-finger salute
+::ctrlaltdel:/sbin/reboot
+
+# Stuff to do before rebooting
+::shutdown:/sbin/openrc shutdown
+EOF