diff options
Diffstat (limited to 'fs/initramfs')
| -rw-r--r-- | fs/initramfs/Config.in | 15 | ||||
| -rw-r--r-- | fs/initramfs/gen_initramfs_list.sh | 203 | ||||
| -rw-r--r-- | fs/initramfs/initramfs.mk | 18 |
3 files changed, 236 insertions, 0 deletions
diff --git a/fs/initramfs/Config.in b/fs/initramfs/Config.in new file mode 100644 index 000000000..d53982cb9 --- /dev/null +++ b/fs/initramfs/Config.in @@ -0,0 +1,15 @@ +config BR2_TARGET_ROOTFS_INITRAMFS + bool "initramfs for initial ramdisk of linux kernel" + help + Build a file which is usable for the gen_init_cpio tool + at linux kernel build. + This file is normally called initramfs_list and can be + generated with gen_initramfs_list.sh script from the root + directory structure. + The file is then used in the kernel build process to generate + the cpio filesystem for the initial ramdisk. Make sure that + you configure this file in kernel build configuration. + The location in the kernel build configuration menu is + Device Drivers -> Block devices -> Initramfs source file(s). + The configuration variable is CONFIG_INITRAMFS_SOURCE + diff --git a/fs/initramfs/gen_initramfs_list.sh b/fs/initramfs/gen_initramfs_list.sh new file mode 100644 index 000000000..26252b619 --- /dev/null +++ b/fs/initramfs/gen_initramfs_list.sh @@ -0,0 +1,203 @@ +#!/bin/sh +# Copyright (C) Martin Schlemmer <azarah@nosferatu.za.org> +# Released under the terms of the GNU GPL +# +# Generate a newline separated list of entries from the file/directory +# supplied as an argument. +# +# If a file/directory is not supplied then generate a small dummy file. +# +# The output is suitable for gen_init_cpio built from usr/gen_init_cpio.c. +# + +default_initramfs() { + cat <<-EOF + # This is a very simple, default initramfs + + dir /dev 0755 0 0 + nod /dev/console 0600 0 0 c 5 1 + dir /root 0700 0 0 + EOF +} + +filetype() { + local argv1="$1" + + # symlink test must come before file test + if [ -L "$argv1" ]; then + echo "slink" + elif [ -f "$argv1" ]; then + echo "file" + elif [ -d "$argv1" ]; then + echo "dir" + elif [ -b "$argv1" -o -c "$argv1" ]; then + echo "nod" + elif [ -p "$argv1" ]; then + echo "pipe" + elif [ -S "$argv1" ]; then + echo "sock" + else + echo "invalid" + fi + return 0 +} + +print_mtime() { + local argv1="$1" + local mymtime="0" + + if [ -e "$argv1" ]; then + mymtime=$(find "$argv1" -printf "%T@\n" | sort -r | head -n 1) + fi + + echo "# Last modified: $mymtime" + echo +} + +parse() { + local location="$1" + local name=$(echo "$location" | sed -e "s,$srcdir,,") + # change '//' into '/' + name=$(echo $name | sed -e 's,/[/]*,/,g') + local mode="$2" + local uid="$3" + local gid="$4" + local ftype=$(filetype "$location") + # remap uid/gid to 0 if necessary + [ "x$uid" != "x" ] && [ $uid -eq $root_uid ] && uid=0 + [ "x$gid" != "x" ] && [ $gid -eq $root_gid ] && gid=0 + local str="$mode $uid $gid" + + [ "$ftype" = "invalid" ] && return 0 + [ "$location" = "$srcdir" ] && return 0 + + case "$ftype" in + "file") + str="$ftype $name $location $str" + ;; + "nod") + local devtype= + local maj=$(LC_ALL=C ls -l "$location" | \ + awk '{sub(/,/, "", $5); print $5}') + local min=$(LC_ALL=C ls -l "$location" | \ + awk '{print $6}') + + if [ -b "$location" ]; then + devtype="b" + else + devtype="c" + fi + str="$ftype $name $str $devtype $maj $min" + ;; + "slink") + local target=$(LC_ALL=C ls -l "$location" | \ + awk '{print $11}') + str="$ftype $name $target $str" + ;; + *) + str="$ftype $name $str" + ;; + esac + + echo "$str" + + return 0 +} + +usage() { + printf "Usage:\n" + printf "$0 [ [-u <root_uid>] [-g <root_gid>] [-d | <cpio_source>] ] . . .\n" + printf "\n" + printf -- "-u <root_uid> User ID to map to user ID 0 (root).\n" + printf " <root_uid> is only meaningful if <cpio_source>\n" + printf " is a directory.\n" + printf -- "-g <root_gid> Group ID to map to group ID 0 (root).\n" + printf " <root_gid> is only meaningful if <cpio_source>\n" + printf " is a directory.\n" + printf "<cpio_source> File list or directory for cpio archive.\n" + printf " If <cpio_source> is not provided then a\n" + printf " a default list will be output.\n" + printf -- "-d Output the default cpio list. If no <cpio_source>\n" + printf " is given then the default cpio list will be output.\n" + printf "\n" + printf "All options may be repeated and are interpreted sequentially\n" + printf "and immediately. -u and -g states are preserved across\n" + printf "<cpio_source> options so an explicit \"-u 0 -g 0\" is required\n" + printf "to reset the root/group mapping.\n" +} + +build_list() { + printf "\n#####################\n# $cpio_source\n" + + if [ -f "$cpio_source" ]; then + print_mtime "$cpio_source" + cat "$cpio_source" + elif [ -d "$cpio_source" ]; then + srcdir=$(echo "$cpio_source" | sed -e 's://*:/:g;s:/$::') + dirlist=$(find "$srcdir" -printf "%p %m %U %G\n" 2>/dev/null) + + # If $dirlist is only one line, then the directory is empty + if [ "$(echo "$dirlist" | wc -l)" -gt 1 ]; then + print_mtime "$cpio_source" + + echo "$dirlist" | \ + while read x; do + parse $x + done + else + # Failsafe in case directory is empty + default_initramfs + fi + else + echo " $0: Cannot open '$cpio_source'" >&2 + exit 1 + fi +} + + +root_uid=0 +root_gid=0 + +while [ $# -gt 0 ]; do + arg="$1" + shift + case "$arg" in + "-u") + root_uid="$1" + shift + ;; + "-g") + root_gid="$1" + shift + ;; + "-d") + default_list="$arg" + default_initramfs + ;; + "-h") + usage + exit 0 + ;; + *) + case "$arg" in + "-"*) + printf "ERROR: unknown option \"$arg\"\n" >&2 + printf "If the filename validly begins with '-', then it must be prefixed\n" >&2 + printf "by './' so that it won't be interpreted as an option." >&2 + printf "\n" >&2 + usage >&2 + exit 1 + ;; + *) + cpio_source="$arg" + build_list + ;; + esac + ;; + esac +done + +# spit out the default cpio list if a source hasn't been specified +[ -z "$cpio_source" -a -z "$default_list" ] && default_initramfs + +exit 0 diff --git a/fs/initramfs/initramfs.mk b/fs/initramfs/initramfs.mk new file mode 100644 index 000000000..cf1fcdbae --- /dev/null +++ b/fs/initramfs/initramfs.mk @@ -0,0 +1,18 @@ +############################################################# +# +# Make a initramfs_list file to be used by gen_init_cpio +# gen_init_cpio is part of the 2.6 linux kernels to build an +# initial ramdisk filesystem based on cpio +# +############################################################# + +define ROOTFS_INITRAMFS_INIT_SYMLINK + rm -f $(TARGET_DIR)/init + ln -s sbin/init $(TARGET_DIR)/init +endef + +define ROOTFS_INITRAMFS_CMD + $(SHELL) target/initramfs/gen_initramfs_list.sh -u 0 -g 0 $(TARGET_DIR) > $$@ +endef + +$(eval $(call ROOTFS_TARGET,initramfs))
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