# 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 pointed
-# out by the environment variable: CONFIG_INITRAMFS_SOURCE
+# Generate a newline separated list of entries from the file/directory
+# supplied as an argument.
#
-# If CONFIG_INITRAMFS_SOURCE is non-existing then generate a small dummy file.
+# If a file/directory is not supplied then generate a small dummy file.
#
-# The output is suitable for gen_init_cpio as found in usr/Makefile.
+# The output is suitable for gen_init_cpio built from usr/gen_init_cpio.c.
#
-simple_initramfs() {
+default_initramfs() {
cat <<-EOF
- # This is a very simple initramfs
+ # This is a very simple, default initramfs
dir /dev 0755 0 0
nod /dev/console 0600 0 0 c 5 1
local uid="$3"
local gid="$4"
local ftype=$(filetype "${location}")
+ # remap uid/gid to 0 if necessary
+ [ "$uid" -eq "$root_uid" ] && uid=0
+ [ "$gid" -eq "$root_gid" ] && gid=0
local str="${mode} ${uid} ${gid}"
[ "${ftype}" == "invalid" ] && return 0
return 0
}
-if [ -z "$1" ]; then
- simple_initramfs
-elif [ -f "$1" ]; then
- print_mtime "$1"
- cat "$1"
-elif [ -d "$1" ]; then
- srcdir=$(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
- print_mtime "$1"
+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 "$cpio_source" | sed -e 's://*:/:g')
+ dirlist=$(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 ${x}
- done
+ echo "${dirlist}" | \
+ while read x; do
+ parse ${x}
+ done
+ else
+ # Failsafe in case directory is empty
+ default_initramfs
+ fi
else
- # Failsafe in case directory is empty
- simple_initramfs
+ echo " $0: Cannot open '$cpio_source'" >&2
+ exit 1
fi
-else
- echo " $0: Cannot open '$1' (CONFIG_INITRAMFS_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
projects / linux-flexiantxendom0-3.2.10.git / blobdiff