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kbuild: rebuild initramfs if content of initramfs changes

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initramfs.cpio.gz being build in usr/ and included in the
kernel was not rebuild when the included files changed.

To fix this the following was done:
- let gen_initramfs.sh generate a list of files and directories included
  in the initramfs
- gen_initramfs generate the gzipped cpio archive so we could simplify
  the kbuild file (Makefile)
- utilising the kbuild infrastructure so when uid/gid root mapping changes
  the initramfs will be rebuild

With this change we have a much more robust initramfs generation.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
This commit is contained in:
Sam Ravnborg 2006-04-11 13:24:32 +02:00
parent d9df92e22a
commit d39a206bc3
2 changed files with 191 additions and 129 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

231
scripts/gen_initramfs_list.sh
View File

@ -1,22 +1,55 @@
#!/bin/bash #!/bin/bash
# Copyright (C) Martin Schlemmer <azarah@nosferatu.za.org> # Copyright (C) Martin Schlemmer <azarah@nosferatu.za.org>
# Copyright (c) 2006 Sam Ravnborg <sam@ravnborg.org>
#
# Released under the terms of the GNU GPL # Released under the terms of the GNU GPL
# #
# Generate a newline separated list of entries from the file/directory # Generate a cpio packed initramfs. It uses gen_init_cpio to generate
# supplied as an argument. # the cpio archive, and gzip to pack it.
# # The script may also be used to generate the inputfile used for gen_init_cpio
# If a file/directory is not supplied then generate a small dummy file. # This script assumes that gen_init_cpio is located in usr/ directory
#
# The output is suitable for gen_init_cpio built from usr/gen_init_cpio.c. # error out on errors
# set -e
usage() {
cat << EOF
Usage:
$0 [-o <file>] [-u <uid>] [-g <gid>] {-d | <cpio_source>} ...
-o <file> Create gzipped initramfs file named <file> using
gen_init_cpio and gzip
-u <uid> User ID to map to user ID 0 (root).
<uid> is only meaningful if <cpio_source>
is a directory.
-g <gid> Group ID to map to group ID 0 (root).
<gid> is only meaningful if <cpio_source>
is a directory.
<cpio_source> File list or directory for cpio archive.
If <cpio_source> is a .cpio file it will be used
as direct input to initramfs.
-d Output the default cpio list.
All options except -o and -l may be repeated and are interpreted
sequentially and immediately. -u and -g states are preserved across
<cpio_source> options so an explicit "-u 0 -g 0" is required
to reset the root/group mapping.
EOF
}
list_default_initramfs() {
# echo usr/kinit/kinit
:
}
default_initramfs() { default_initramfs() {
cat <<-EOF cat <<-EOF >> ${output}
# This is a very simple, default initramfs # This is a very simple, default initramfs
dir /dev 0755 0 0 dir /dev 0755 0 0
nod /dev/console 0600 0 0 c 5 1 nod /dev/console 0600 0 0 c 5 1
dir /root 0700 0 0 dir /root 0700 0 0
# file /kinit usr/kinit/kinit 0755 0 0
# slink /init kinit 0755 0 0
EOF EOF
} }
@ -42,18 +75,28 @@ filetype() {
return 0 return 0
} }
print_mtime() { list_print_mtime() {
local argv1="$1" :
local my_mtime="0"
if [ -e "${argv1}" ]; then
my_mtime=$(find "${argv1}" -printf "%T@\n" | sort -r | head -n 1)
fi
echo "# Last modified: ${my_mtime}"
echo
} }
print_mtime() {
local my_mtime="0"
if [ -e "$1" ]; then
my_mtime=$(find "$1" -printf "%T@\n" | sort -r | head -n 1)
fi
echo "# Last modified: ${my_mtime}" >> ${output}
echo "" >> ${output}
}
list_parse() {
echo "$1 \\"
}
# for each file print a line in following format
# <filetype> <name> <path to file> <octal mode> <uid> <gid>
# for links, devices etc the format differs. See gen_init_cpio for details
parse() { parse() {
local location="$1" local location="$1"
local name="${location/${srcdir}//}" local name="${location/${srcdir}//}"
@ -99,80 +142,112 @@ parse() {
;; ;;
esac esac
echo "${str}" echo "${str}" >> ${output}
return 0 return 0
} }
usage() { unknown_option() {
printf "Usage:\n" printf "ERROR: unknown option \"$arg\"\n" >&2
printf "$0 [ [-u <root_uid>] [-g <root_gid>] [-d | <cpio_source>] ] . . .\n" printf "If the filename validly begins with '-', " >&2
printf "\n" printf "then it must be prefixed\n" >&2
printf -- "-u <root_uid> User ID to map to user ID 0 (root).\n" printf "by './' so that it won't be interpreted as an option." >&2
printf " <root_uid> is only meaningful if <cpio_source>\n" printf "\n" >&2
printf " is a directory.\n" usage >&2
printf -- "-g <root_gid> Group ID to map to group ID 0 (root).\n" exit 1
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() { list_header() {
printf "\n#####################\n# $cpio_source\n" echo "deps_initramfs := \\"
}
if [ -f "$cpio_source" ]; then header() {
print_mtime "$cpio_source" printf "\n#####################\n# $1\n" >> ${output}
cat "$cpio_source" }
elif [ -d "$cpio_source" ]; then
srcdir=$(echo "$cpio_source" | sed -e 's://*:/:g')
dirlist=$(find "${srcdir}" -printf "%p %m %U %G\n" 2>/dev/null)
# If $dirlist is only one line, then the directory is empty # process one directory (incl sub-directories)
if [ "$(echo "${dirlist}" | wc -l)" -gt 1 ]; then dir_filelist() {
print_mtime "$cpio_source" ${dep_list}header "$1"
echo "${dirlist}" | \ srcdir=$(echo "$1" | sed -e 's://*:/:g')
while read x; do dirlist=$(find "${srcdir}" -printf "%p %m %U %G\n" 2>/dev/null)
parse ${x}
done # If $dirlist is only one line, then the directory is empty
else if [ "$(echo "${dirlist}" | wc -l)" -gt 1 ]; then
# Failsafe in case directory is empty ${dep_list}print_mtime "$1"
default_initramfs
echo "${dirlist}" | \
while read x; do
${dep_list}parse ${x}
done
fi
}
# if only one file is specified and it is .cpio file then use it direct as fs
# if a directory is specified then add all files in given direcotry to fs
# if a regular file is specified assume it is in gen_initramfs format
input_file() {
source="$1"
if [ -f "$1" ]; then
${dep_list}header "$1"
is_cpio="$(echo "$1" | sed 's/^.*\.cpio/cpio/')"
if [ $2 -eq 0 -a ${is_cpio} == "cpio" ]; then
cpio_file=$1
[ ! -z ${dep_list} ] && echo "$1"
return 0
fi fi
if [ -z ${dep_list} ]; then
print_mtime "$1" >> ${output}
cat "$1" >> ${output}
else
grep ^file "$1" | cut -d ' ' -f 3
fi
elif [ -d "$1" ]; then
dir_filelist "$1"
else else
echo " $0: Cannot open '$cpio_source'" >&2 echo " ${prog}: Cannot open '$1'" >&2
exit 1 exit 1
fi fi
} }
prog=$0
root_uid=0 root_uid=0
root_gid=0 root_gid=0
dep_list=
cpio_file=
cpio_list=
output="/dev/stdout"
output_file=""
arg="$1"
case "$arg" in
"-l") # files included in initramfs - used by kbuild
dep_list="list_"
shift
;;
"-o") # generate gzipped cpio image named $1
shift
output_file="$1"
cpio_list="$(mktemp ${TMPDIR:-/tmp}/cpiolist.XXXXXX)"
output=${cpio_list}
shift
;;
esac
while [ $# -gt 0 ]; do while [ $# -gt 0 ]; do
arg="$1" arg="$1"
shift shift
case "$arg" in case "$arg" in
"-u") "-u") # map $1 to uid=0 (root)
root_uid="$1" root_uid="$1"
shift shift
;; ;;
"-g") "-g") # map $1 to gid=0 (root)
root_gid="$1" root_gid="$1"
shift shift
;; ;;
"-d") "-d") # display default initramfs list
default_list="$arg" default_list="$arg"
default_initramfs ${dep_list}default_initramfs
;; ;;
"-h") "-h")
usage usage
@ -181,23 +256,27 @@ while [ $# -gt 0 ]; do
*) *)
case "$arg" in case "$arg" in
"-"*) "-"*)
printf "ERROR: unknown option \"$arg\"\n" >&2 unknown_option
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
;; ;;
*) *) # input file/dir - process it
cpio_source="$arg" input_file "$arg" "$#"
build_list
;; ;;
esac esac
;; ;;
esac esac
done done
# spit out the default cpio list if a source hasn't been specified # If output_file is set we will generate cpio archive and gzip it
[ -z "$cpio_source" -a -z "$default_list" ] && default_initramfs # we are carefull to delete tmp files
if [ ! -z ${output_file} ]; then
if [ -z ${cpio_file} ]; then
cpio_tfile="$(mktemp ${TMPDIR:-/tmp}/cpiofile.XXXXXX)"
usr/gen_init_cpio ${cpio_list} > ${cpio_tfile}
else
cpio_tfile=${cpio_file}
fi
rm ${cpio_list}
cat ${cpio_tfile} | gzip -f -9 - > ${output_file}
[ -z ${cpio_file} ] && rm ${cpio_tfile}
fi
exit 0 exit 0

89
usr/Makefile
View File

@ -1,65 +1,48 @@
#
# kbuild file for usr/ - including initramfs image
#
klibcdirs:;
# Generate builtin.o based on initramfs_data.o
obj-y := initramfs_data.o obj-y := initramfs_data.o
hostprogs-y := gen_init_cpio
clean-files := initramfs_data.cpio.gz initramfs_list
# initramfs_data.o contains the initramfs_data.cpio.gz image. # initramfs_data.o contains the initramfs_data.cpio.gz image.
# The image is included using .incbin, a dependency which is not # The image is included using .incbin, a dependency which is not
# tracked automatically. # tracked automatically.
$(obj)/initramfs_data.o: $(obj)/initramfs_data.cpio.gz FORCE $(obj)/initramfs_data.o: $(obj)/initramfs_data.cpio.gz FORCE
ifdef CONFIG_INITRAMFS_ROOT_UID #####
gen_initramfs_args += -u $(CONFIG_INITRAMFS_ROOT_UID) # Generate the initramfs cpio archive
hostprogs-y := gen_init_cpio
initramfs := $(CONFIG_SHELL) $(srctree)/scripts/gen_initramfs_list.sh
ramfs-input := $(if $(filter-out "",$(CONFIG_INITRAMFS_SOURCE)), \
$(CONFIG_INITRAMFS_SOURCE),-d)
ramfs-args := \
$(if $(CONFIG_INITRAMFS_ROOT_UID), -u $(CONFIG_INITRAMFS_ROOT_UID)) \
$(if $(CONFIG_INITRAMFS_ROOT_GID), -g $(CONFIG_INITRAMFS_ROOT_GID)) \
$(ramfs-input)
# .initramfs_data.cpio.gz.d is used to identify all files included
# in initramfs and to detect if any files are added/removed.
# Removed files are identified by directory timestamp being updated
# The dependency list is generated by gen_initramfs.sh -l
ifneq ($(wildcard $(obj)/.initramfs_data.cpio.gz.d),)
include $(obj)/.initramfs_data.cpio.gz.d
endif endif
ifdef CONFIG_INITRAMFS_ROOT_GID quiet_cmd_initfs = GEN $@
gen_initramfs_args += -g $(CONFIG_INITRAMFS_ROOT_GID) cmd_initfs = $(initramfs) -o $@ $(ramfs-args) $(ramfs-input)
endif
# The $(shell echo $(CONFIG_INITRAMFS_SOURCE)) is to remove the targets := initramfs_data.cpio.gz
# gratuitous begin and end quotes from the Kconfig string type. $(deps_initramfs): klibcdirs
# Internal, escaped quotes in the Kconfig string will loose the # We rebuild initramfs_data.cpio.gz if:
# escape and become active quotes. # 1) Any included file is newer then initramfs_data.cpio.gz
quotefixed_initramfs_source := $(shell echo $(CONFIG_INITRAMFS_SOURCE)) # 2) There are changes in which files are included (added or deleted)
# 3) If gen_init_cpio are newer than initramfs_data.cpio.gz
filechk_initramfs_list = $(CONFIG_SHELL) \ # 4) arguments to gen_initramfs.sh changes
$(srctree)/scripts/gen_initramfs_list.sh $(gen_initramfs_args) $(quotefixed_initramfs_source) $(obj)/initramfs_data.cpio.gz: $(obj)/gen_init_cpio $(deps_initramfs) klibcdirs
$(Q)$(initramfs) -l $(ramfs-input) > $(obj)/.initramfs_data.cpio.gz.d
$(obj)/initramfs_list: $(obj)/Makefile FORCE $(call if_changed,initfs)
$(call filechk,initramfs_list)
quiet_cmd_cpio = CPIO $@
cmd_cpio = ./$< $(obj)/initramfs_list > $@
# Check if the INITRAMFS_SOURCE is a cpio archive
ifneq (,$(findstring .cpio,$(quotefixed_initramfs_source)))
# INITRAMFS_SOURCE has a cpio archive - verify that it's a single file
ifneq (1,$(words $(quotefixed_initramfs_source)))
$(error Only a single file may be specified in CONFIG_INITRAMFS_SOURCE (="$(quotefixed_initramfs_source)") when a cpio archive is directly specified.)
endif
# Now use the cpio archive directly
initramfs_data_cpio = $(quotefixed_initramfs_source)
targets += $(quotefixed_initramfs_source)
else
# INITRAMFS_SOURCE is not a cpio archive - create one
$(obj)/initramfs_data.cpio: $(obj)/gen_init_cpio \
$(initramfs-y) $(obj)/initramfs_list FORCE
$(call if_changed,cpio)
targets += initramfs_data.cpio
initramfs_data_cpio = $(obj)/initramfs_data.cpio
endif
$(obj)/initramfs_data.cpio.gz: $(initramfs_data_cpio) FORCE
$(call if_changed,gzip)
targets += initramfs_data.cpio.gz