2020-01-06 00:20:12 +05:30
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#!/bin/sh
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2020-01-05 23:31:39 +05:30
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#
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# tiny initramfs generation tool
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2020-01-06 00:20:12 +05:30
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# debugging
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set -x
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2020-01-05 23:31:39 +05:30
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# check root
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if [ "$(id -u)" != 0 ]; then
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echo "must be run as root!"
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exit 1
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fi
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# check files
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[ -f ./config ] && . ./config || ( echo "config doesn't exists";exit 1 )
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[ -x ./busybox ] && ldd ./busybox | grep -q "not a dynamic executable" || ( echo "busybox doesn't exists or dynamically linked. please download or/and build static busybox";exit 1 )
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[ -f ./init ] || ( echo "init doesn't exists";exit 1 )
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# variables
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tmpdir="$(mktemp -d /tmp/initramfs.XXXXXXXX)"
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kernel="$(uname -r)"
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moddir="/lib/modules"
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# structure
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for d in bin dev etc lib/modules mnt/root proc root sys; do
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mkdir -p "$tmpdir/$d"
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done
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#ln -rs "$tmpdir/usr/lib" "$tmpdir/lib"
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#ln -rs "$tmpdir/usr/lib" "$tmpdir/lib64"
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#ln -rs "$tmpdir/usr/bin" "$tmpdir/bin"
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# TODO parse fstab | parse crypttab
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#while [ "$use_fstab" -eq 1 ] && read fs dir type opts; do thing; done < /etc/fstab
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2020-01-06 00:20:12 +05:30
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# TODO rewrite drivers installing | handle $drivers config var
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2020-01-05 23:31:39 +05:30
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# install drivers
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find "$moddir/$kernel/kernel/drivers/virtio" "$moddir/$kernel/kernel/arch" "$moddir/$kernel/kernel/crypto" "$moddir/$kernel/kernel/fs" "$moddir/$kernel/kernel/lib" "$moddir/$kernel/kernel/drivers/block" "$moddir/$kernel/kernel/drivers/ata" "$moddir/$kernel/kernel/drivers/md" "$moddir/$kernel/kernel/drivers/scsi" "$moddir/$kernel/kernel/drivers/usb/storage" "$moddir/$kernel/kernel/drivers/usb/host" -type f -exec cp --parents "{}" "$tmpdir" ";"
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cp "$moddir/$kernel/modules.builtin" "$moddir/$kernel/modules.order" "$tmpdir/$moddir/$kernel"
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# temporary workaround
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./busybox depmod -b "$tmpdir" "$kernel"
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2020-01-06 00:20:12 +05:30
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# TODO rewrite binaries installing | handle $binaries config var
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2020-01-05 23:31:39 +05:30
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# install binaries
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#for b in $(echo "$binaries"); do
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#mkdir -p "$tmpdir/usr/bin"
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#mkdir -p "$tmpdir/usr/lib"
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#cp -n "/lib/ld-linux-x86-64.so.2" "$tmpdir/usr/lib" && strip -s "$tmpdir/usr/lib/ld-linux-x86-64.so.2"
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#cp "$(which $b)" "$tmpdir/usr/bin"
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#ldd "$(which $b)" | grep '=> /' | awk '{print $3}' | xargs -I '{}' cp -n '{}' "$tmpdir/usr/lib"
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#done
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# install files
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cp ./init "$tmpdir/init" && chmod +x "$tmpdir/init"
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cp ./busybox "$tmpdir/bin/busybox" && chmod +x "$tmpdir/bin/busybox"
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cat <<EOF > "$tmpdir/config"
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root="$root"
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rootfstype="$rootfstype"
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rootflags="$rootflags"
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drivers="$drivers"
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#use_lvm="$use_lvm"
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#lvm_discard="$lvm_discard"
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#use_luks="$use_luks"
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#luks_header="$luks_header"
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#luks_keyfile="$luks_keyfile"
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#luks_discard="$luks_discard"
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EOF
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# packing
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if ! ( cd "$tmpdir" && find . | cpio --create --verbose --format=newc | gzip --best ) > "./initramfs-$kernel.img.gz"; then
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echo "failed"
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exit 1
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fi
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rm -rf "$tmpdir"
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echo "done! check out initramfs-$kernel.img.gz"
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