From 3aa6b2030b0817e4134c067dcd8c9962c4574c79 Mon Sep 17 00:00:00 2001
From: Ralph Ronnquist <rrq@rrq.au>
Date: Tue, 6 Feb 2024 10:59:04 +1100
Subject: [PATCH] initial scripting

---
 init-udevd.template |  22 +++++++
 init.template       |  17 ++++++
 message.txt         |  15 +++++
 minbase-strap.sh    | 140 ++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 194 insertions(+)
 create mode 100755 init-udevd.template
 create mode 100755 init.template
 create mode 100644 message.txt
 create mode 100755 minbase-strap.sh

diff --git a/init-udevd.template b/init-udevd.template
new file mode 100755
index 0000000..1e39fa1
--- /dev/null
+++ b/init-udevd.template
@@ -0,0 +1,22 @@
+#!/bin/sh
+mount -t proc proc /proc
+mount -t sysfs sysfs /sys
+mount -t devtmpfs devtmpfs /dev
+mkdir /dev/pts
+mount -t devpts devpts /dev/pts
+
+#MODULES=" \
+#scsi_mod sd_mod ata_piix \
+#crc32c ext4 \
+#nls_ascii nls_cp437 vfat fat \
+#"
+#for m in $MODULES ; do modprobe $m ; done
+
+cat <<EOF | /bin/sh > udev.log 2>&1
+udevd -d -D
+udevadm trigger -c add -v
+EOF
+
+cat message.txt
+
+exec setsid cttyhack sh
diff --git a/init.template b/init.template
new file mode 100755
index 0000000..6bb90a8
--- /dev/null
+++ b/init.template
@@ -0,0 +1,17 @@
+#!/bin/sh
+mount -t proc proc /proc
+mount -t sysfs sysfs /sys
+mount -t devtmpfs devtmpfs /dev
+mkdir /dev/pts
+mount -t devpts devpts /dev/pts
+
+MODULES=" \
+scsi_mod sd_mod ata_piix \
+crc32c ext4 \
+nls_ascii nls_cp437 vfat fat \
+"
+for m in $MODULES ; do modprobe $m ; done
+
+cat message.txt
+
+exec setsid cttyhack sh
diff --git a/message.txt b/message.txt
new file mode 100644
index 0000000..3ab21ed
--- /dev/null
+++ b/message.txt
@@ -0,0 +1,15 @@
+  **____****************************************
+   / ___|_ __ ___  ___| |_(_)_ __   __ _ ___ 
+  | |  _| '__/ _ \/ _ \ __| | '_ \ / _` / __|
+  | |_| | | |  __/  __/ |_| | | | | (_| \__ \
+   \____|_|  \___|\___|\__|_|_| |_|\__, |___/
+                                   |___/     
+   _____           _   _     _ _             _ 
+  | ____|__ _ _ __| |_| |__ | (_)_ __   __ _| |
+  |  _| / _` | '__| __| '_ \| | | '_ \ / _` | |
+  | |__| (_| | |  | |_| | | | | | | | | (_| |_|
+  |_____\__,_|_|   \__|_| |_|_|_|_| |_|\__, (_)
+                                       |___/   
+  *************************************
+
+        You are now on your own...
diff --git a/minbase-strap.sh b/minbase-strap.sh
new file mode 100755
index 0000000..852e9cb
--- /dev/null
+++ b/minbase-strap.sh
@@ -0,0 +1,140 @@
+#!/bin/bash
+#
+# Utility script to debootstrap a minbase filesystem, with additions
+# of kernel, busybox and an init script. Then make an initrd.gz from
+# that and prepare a boot image file with syslinux from that.
+#
+if [ $(id -u) -ne 0 ] ; then
+    exec sudo env http_proxy=$http_proxy $0 $*
+    echo "** Abort: must be root" >&2
+    exit 1
+fi
+set -e -x
+
+ARCH="${1-$(dpkg-architecture -q DEB_HOST_ARCH)}"
+DIST=${2-ceres}
+IMG=${3-boot-$DIST-$ARCH.img}
+FS=${4-FS}
+
+# Prepare or keep FS
+DEBSTRAP=true
+USRMERGE=true
+if [ -d "$FS" ] ; then
+    select x in "keep existing $FS and skip debootstrap" \
+		    "remove existing $FS and debootstrap anew" \
+		    "abort" ; do
+	[ "$x" = abort ] && exit 1
+	[ -z "$x" ] || break
+    done
+    echo "selection: $REPLY"
+    [ "$REPLY" = 1 ] && DEBSTRAP=false
+fi
+
+if $DEBSTRAP ; then
+    ## Optionally add the stupid-links
+    read -n 1 -p "prime $FS with stupid-links? [Yn]" x
+    [ "$x" = "n" ] && USRMERGE=false
+
+    rm -rf "$FS" # remove if existin
+
+    if $USRMERGE ; then
+	mkdir -p "$FS"/usr
+	for d in bin sbin lib ; do
+	    mkdir "$FS"/usr/$d
+	    ln -s usr/$d "$FS"/$d
+	done
+    fi
+
+    ## bootstrap a filesystem, with exclusions
+    echo "http_proxy=$http_proxy debootstrap ..."
+    debootstrap --exclude=logrotate,cron,cron-daemon-common \
+		--arch=$ARCH $DIST "$FS" http://deb.devuan.org/merged
+    chroot "$FS" apt-get install -y logrotate cron
+
+    ## Select and add a kernel
+    KERNELS=( $(chroot "$FS" apt-cache search linux-image-\* | \
+		    sed 's/\s.*//' | sort -h ) )
+    echo "** Please select kernel **"
+    select KERNEL in "${KERNELS[@]}" ; do [ -n "$KERNEL" ] && break ; done
+    chroot "$FS" apt-get install -y $KERNEL
+    chroot "$FS" depmod -a ${KERNEL#linux-image-}
+
+    chroot "$FS" apt-get install -y busybox-static debootstrap
+    touch "$FS"/usr/bin{linuxrc,init} # block these
+    chroot "$FS" /usr/bin/busybox --install -s /usr/bin
+
+fi # End of $DEBSTRAP actions
+
+## (re)install /init
+echo "** Please select /init template"
+select INIT in none $(echo init*.template) ; do [ -n "$INIT" ] && break ; done
+if [ "$INIT" != none ] ; then
+    cp $INIT "$FS"/init
+    cp message.txt "$FS"/
+    chmod a+x "$FS"/init
+fi
+
+## Pick boot kernel, if there are many
+LINUXES=( $(cd "$FS"/boot ; ls vmlinuz* 2>/dev/null) )
+if [ ${#LINUXES[@]} -gt 1 ] ; then
+    echo "** Please select boot kernel"
+    select LINUX in $LINUXES ; do [ -n "$LINUX" ] && break ; done
+elif [ -n "$LINUXES" ] ; then
+    LINUX="$FS"/boot/${LINUXES[0]}
+else
+    echo "** Oh No! There is no $FS/boot/vmlinux-* ... bailing out!" >&2
+    exit 1
+fi
+
+#============================================================
+# Prepare a temporary directory tree with a boot kernel and $FS packed
+# up into an initrd.gz
+TMP=$(mktemp -d XXXX)
+trap "rm -r $TMP" 0 2 15
+
+( cd "$FS" && find -printf '%P\n' | cpio -o -H newc ) | \
+    gzip > $TMP/initrd.gz
+cp $LINUX $TMP/vmlinuz
+
+#============================================================
+# Add syslinux boot equipment for bios boot under $TMP/syslinux
+# (also includes the syslinux image mastering further below)
+echo "Please select boot console options"
+
+CONOPTS=( none ttyS0,115200 )
+select CON in "${CONOPTS[@]}" ; do [ -n "$CON" ] && break ; done
+case "$CON" in none) CON= ;; *) CON="console=$CON" ;; esac
+
+mkdir -p $TMP/syslinux
+cp -t $TMP/syslinux /usr/lib/syslinux/modules/bios/*
+cat <<EOF > $TMP/syslinux/syslinux.cfg
+default menu.c32
+label linux
+    kernel /vmlinuz
+    append initrd=/initrd.gz init=/init console=ttyS0,115200 
+EOF
+
+#============================================================
+[ -e "$IMG" ] && read -p "** Will overwrite $IMG (or ^C here and now)" x
+rm -f "$IMG"
+
+# Estimate the required disk image size in Mib
+DUM=$(( $(du -sB1 $TMP | sed 's/\s.*//') / 1048576 + 3 ))
+
+# Create the image, with the partition marked as EFI parition and
+# bootable; acutal format is FAT{12,16,32}
+dd if=/dev/zero of="$IMG" bs=${DUM}M count=0 seek=1 status=none
+cat <<EOF | sfdisk -q "$IMG"
+label: dos
+
+- - 0xef *
+EOF
+# First sector is 2048 by default, which is byte address 1048576
+mkfs.fat --offset 2048 "$IMG" >/dev/null
+mcopy -i "$IMG@@1048576" -s $TMP/* ::/
+[ -z "$SUDO_USER" ] || chown $SUDO_USER: "$IMG"
+
+#============================================================
+# Final syslinux bios boot image mastering
+dd if=/usr/lib/SYSLINUX/mbr.bin of="$IMG" bs=440 conv=notrunc status=none
+syslinux -i -d syslinux -t 1048576 "$IMG"
-- 
2.39.2