- provide option to build an initramfs out of the current rootfs. Closes #881

diff --git a/target/Config.in b/target/Config.in
index 0e9db8933ce04454bbd50a49796f7808c96ee2a5..5913ffc6d3abbe0487907e1b977eaedf486f53ed 100644 (file)
--- a/target/Config.in
+++ b/target/Config.in
@@ -10,6 +10,7 @@ source "target/squashfs/Config.in"
 source "target/tar/Config.in"
 source "target/cpio/Config.in"
 source "target/iso9660/Config.in"
+source "target/initramfs/Config.in"
 
 comment "bootloader for target device"
 

diff --git a/target/initramfs/Config.in b/target/initramfs/Config.in
new file mode 100644 (file)
index 0000000..53e45c3
--- /dev/null
+++ b/target/initramfs/Config.in
@@ -0,0 +1,16 @@
+config BR2_TARGET_ROOTFS_INITRAMFS
+       bool "initramfs for initial ramdisk of linux kernel"
+       default n
+       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/target/initramfs/gen_initramfs_list.sh b/target/initramfs/gen_initramfs_list.sh
new file mode 100644 (file)
index 0000000..26252b6
--- /dev/null
+++ b/target/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/target/initramfs/initramfs.mk b/target/initramfs/initramfs.mk
new file mode 100644 (file)
index 0000000..e4ae148
--- /dev/null
+++ b/target/initramfs/initramfs.mk
@@ -0,0 +1,43 @@
+#############################################################
+#
+# 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
+#
+#############################################################
+
+ifeq ($(strip $(BR2_TARGET_ROOTFS_INITRAMFS)),y)
+INITRAMFS_TARGET:=$(IMAGE).initramfs_list
+else
+INITRAMFS_TARGET:= #nothing
+endif
+
+$(INITRAMFS_TARGET) initramfs: host-fakeroot makedevs
+       -find $(TARGET_DIR) -type f -perm +111 | xargs $(STRIP) 2>/dev/null || true;
+       rm -rf $(TARGET_DIR)/usr/man
+       rm -rf $(TARGET_DIR)/usr/info
+       -/sbin/ldconfig -r $(TARGET_DIR) 2>/dev/null
+       # Use fakeroot to pretend all target binaries are owned by root
+       rm -f $(STAGING_DIR)/_fakeroot.$(notdir $(TAR_TARGET))
+       touch $(STAGING_DIR)/.fakeroot.00000
+       cat $(STAGING_DIR)/.fakeroot* > $(STAGING_DIR)/_fakeroot.$(notdir $(TAR_TARGET))
+       echo "chown -R 0:0 $(TARGET_DIR)" >> $(STAGING_DIR)/_fakeroot.$(notdir $(TAR_TARGET))
+       # Use fakeroot to pretend to create all needed device nodes
+       echo "$(STAGING_DIR)/bin/makedevs -d $(TARGET_DEVICE_TABLE) $(TARGET_DIR)" \
+               >> $(STAGING_DIR)/_fakeroot.$(notdir $(TAR_TARGET))
+       # Use fakeroot so gen_initramfs_list.sh  believes the previous fakery
+       echo "$(CONFIG_SHELL) target/initramfs/gen_initramfs_list.sh -u 0 -g 0 $(TARGET_DIR) > $(INITRAMFS_TARGET)" \
+               >> $(STAGING_DIR)/_fakeroot.$(notdir $(TAR_TARGET))
+       chmod a+x $(STAGING_DIR)/_fakeroot.$(notdir $(TAR_TARGET))
+       $(STAGING_DIR)/usr/bin/fakeroot -- $(STAGING_DIR)/_fakeroot.$(notdir $(TAR_TARGET))
+       -rm -f $(STAGING_DIR)/_fakeroot.$(notdir $(TAR_TARGET))
+
+initramfs-source:
+
+initramfs-clean:
+ifeq ($(strip $(BR2_TARGET_ROOTFS_INITRAMFS)),y)
+       -rm -f $(INITRAMFS_TARGET)
+endif
+initramfs-dirclean:
+
+