mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-11 04:18:39 +08:00
kbuild: rebuild initramfs if content of initramfs changes
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
parent
d9df92e22a
commit
d39a206bc3
@ -1,22 +1,55 @@
|
||||
#!/bin/bash
|
||||
# Copyright (C) Martin Schlemmer <azarah@nosferatu.za.org>
|
||||
# Copyright (c) 2006 Sam Ravnborg <sam@ravnborg.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.
|
||||
#
|
||||
# Generate a cpio packed initramfs. It uses gen_init_cpio to generate
|
||||
# the cpio archive, and gzip to pack it.
|
||||
# The script may also be used to generate the inputfile used for gen_init_cpio
|
||||
# This script assumes that gen_init_cpio is located in usr/ directory
|
||||
|
||||
# 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() {
|
||||
cat <<-EOF
|
||||
cat <<-EOF >> ${output}
|
||||
# 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
|
||||
# file /kinit usr/kinit/kinit 0755 0 0
|
||||
# slink /init kinit 0755 0 0
|
||||
EOF
|
||||
}
|
||||
|
||||
@ -42,18 +75,28 @@ filetype() {
|
||||
return 0
|
||||
}
|
||||
|
||||
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
|
||||
list_print_mtime() {
|
||||
:
|
||||
}
|
||||
|
||||
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() {
|
||||
local location="$1"
|
||||
local name="${location/${srcdir}//}"
|
||||
@ -99,80 +142,112 @@ parse() {
|
||||
;;
|
||||
esac
|
||||
|
||||
echo "${str}"
|
||||
echo "${str}" >> ${output}
|
||||
|
||||
return 0
|
||||
}
|
||||
|
||||
usage() {
|
||||
printf "Usage:\n"
|
||||
printf "$0 [ [-u <root_uid>] [-g <root_gid>] [-d | <cpio_source>] ] . . .\n"
|
||||
printf "\n"
|
||||
printf -- "-u <root_uid> User ID to map to user ID 0 (root).\n"
|
||||
printf " <root_uid> is only meaningful if <cpio_source>\n"
|
||||
printf " is a directory.\n"
|
||||
printf -- "-g <root_gid> Group ID to map to group ID 0 (root).\n"
|
||||
printf " <root_gid> is only meaningful if <cpio_source>\n"
|
||||
printf " is a directory.\n"
|
||||
printf "<cpio_source> File list or directory for cpio archive.\n"
|
||||
printf " If <cpio_source> is not provided then a\n"
|
||||
printf " a default list will be output.\n"
|
||||
printf -- "-d Output the default cpio list. If no <cpio_source>\n"
|
||||
printf " is given then the default cpio list will be output.\n"
|
||||
printf "\n"
|
||||
printf "All options may be repeated and are interpreted sequentially\n"
|
||||
printf "and immediately. -u and -g states are preserved across\n"
|
||||
printf "<cpio_source> options so an explicit \"-u 0 -g 0\" is required\n"
|
||||
printf "to reset the root/group mapping.\n"
|
||||
unknown_option() {
|
||||
printf "ERROR: unknown option \"$arg\"\n" >&2
|
||||
printf "If the filename validly begins with '-', " >&2
|
||||
printf "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
|
||||
}
|
||||
|
||||
build_list() {
|
||||
printf "\n#####################\n# $cpio_source\n"
|
||||
list_header() {
|
||||
echo "deps_initramfs := \\"
|
||||
}
|
||||
|
||||
if [ -f "$cpio_source" ]; then
|
||||
print_mtime "$cpio_source"
|
||||
cat "$cpio_source"
|
||||
elif [ -d "$cpio_source" ]; then
|
||||
srcdir=$(echo "$cpio_source" | sed -e 's://*:/:g')
|
||||
dirlist=$(find "${srcdir}" -printf "%p %m %U %G\n" 2>/dev/null)
|
||||
header() {
|
||||
printf "\n#####################\n# $1\n" >> ${output}
|
||||
}
|
||||
|
||||
# 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
|
||||
# process one directory (incl sub-directories)
|
||||
dir_filelist() {
|
||||
${dep_list}header "$1"
|
||||
|
||||
srcdir=$(echo "$1" | sed -e 's://*:/:g')
|
||||
dirlist=$(find "${srcdir}" -printf "%p %m %U %G\n" 2>/dev/null)
|
||||
|
||||
# If $dirlist is only one line, then the directory is empty
|
||||
if [ "$(echo "${dirlist}" | wc -l)" -gt 1 ]; then
|
||||
${dep_list}print_mtime "$1"
|
||||
|
||||
echo "${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
|
||||
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
|
||||
echo " $0: Cannot open '$cpio_source'" >&2
|
||||
echo " ${prog}: Cannot open '$1'" >&2
|
||||
exit 1
|
||||
fi
|
||||
}
|
||||
|
||||
|
||||
prog=$0
|
||||
root_uid=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
|
||||
arg="$1"
|
||||
shift
|
||||
case "$arg" in
|
||||
"-u")
|
||||
"-u") # map $1 to uid=0 (root)
|
||||
root_uid="$1"
|
||||
shift
|
||||
;;
|
||||
"-g")
|
||||
"-g") # map $1 to gid=0 (root)
|
||||
root_gid="$1"
|
||||
shift
|
||||
;;
|
||||
"-d")
|
||||
"-d") # display default initramfs list
|
||||
default_list="$arg"
|
||||
default_initramfs
|
||||
${dep_list}default_initramfs
|
||||
;;
|
||||
"-h")
|
||||
usage
|
||||
@ -181,23 +256,27 @@ while [ $# -gt 0 ]; do
|
||||
*)
|
||||
case "$arg" in
|
||||
"-"*)
|
||||
printf "ERROR: unknown option \"$arg\"\n" >&2
|
||||
printf "If the filename validly begins with '-', then it must be prefixed\n" >&2
|
||||
printf "by './' so that it won't be interpreted as an option." >&2
|
||||
printf "\n" >&2
|
||||
usage >&2
|
||||
exit 1
|
||||
unknown_option
|
||||
;;
|
||||
*)
|
||||
cpio_source="$arg"
|
||||
build_list
|
||||
*) # input file/dir - process it
|
||||
input_file "$arg" "$#"
|
||||
;;
|
||||
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
|
||||
|
||||
# If output_file is set we will generate cpio archive and gzip it
|
||||
# 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
|
||||
|
||||
89
usr/Makefile
89
usr/Makefile
@ -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
|
||||
|
||||
hostprogs-y := gen_init_cpio
|
||||
|
||||
clean-files := initramfs_data.cpio.gz initramfs_list
|
||||
|
||||
# initramfs_data.o contains the initramfs_data.cpio.gz image.
|
||||
# The image is included using .incbin, a dependency which is not
|
||||
# tracked automatically.
|
||||
$(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
|
||||
|
||||
ifdef CONFIG_INITRAMFS_ROOT_GID
|
||||
gen_initramfs_args += -g $(CONFIG_INITRAMFS_ROOT_GID)
|
||||
endif
|
||||
quiet_cmd_initfs = GEN $@
|
||||
cmd_initfs = $(initramfs) -o $@ $(ramfs-args) $(ramfs-input)
|
||||
|
||||
# The $(shell echo $(CONFIG_INITRAMFS_SOURCE)) is to remove the
|
||||
# gratuitous begin and end quotes from the Kconfig string type.
|
||||
# Internal, escaped quotes in the Kconfig string will loose the
|
||||
# escape and become active quotes.
|
||||
quotefixed_initramfs_source := $(shell echo $(CONFIG_INITRAMFS_SOURCE))
|
||||
|
||||
filechk_initramfs_list = $(CONFIG_SHELL) \
|
||||
$(srctree)/scripts/gen_initramfs_list.sh $(gen_initramfs_args) $(quotefixed_initramfs_source)
|
||||
|
||||
$(obj)/initramfs_list: $(obj)/Makefile FORCE
|
||||
$(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
|
||||
targets := initramfs_data.cpio.gz
|
||||
$(deps_initramfs): klibcdirs
|
||||
# We rebuild initramfs_data.cpio.gz if:
|
||||
# 1) Any included file is newer then initramfs_data.cpio.gz
|
||||
# 2) There are changes in which files are included (added or deleted)
|
||||
# 3) If gen_init_cpio are newer than initramfs_data.cpio.gz
|
||||
# 4) arguments to gen_initramfs.sh changes
|
||||
$(obj)/initramfs_data.cpio.gz: $(obj)/gen_init_cpio $(deps_initramfs) klibcdirs
|
||||
$(Q)$(initramfs) -l $(ramfs-input) > $(obj)/.initramfs_data.cpio.gz.d
|
||||
$(call if_changed,initfs)
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user