aboutsummaryrefslogtreecommitdiffstats
path: root/scripts/gen_initramfs_list.sh
diff options
context:
space:
mode:
Diffstat (limited to 'scripts/gen_initramfs_list.sh')
-rw-r--r--scripts/gen_initramfs_list.sh203
1 files changed, 203 insertions, 0 deletions
diff --git a/scripts/gen_initramfs_list.sh b/scripts/gen_initramfs_list.sh
new file mode 100644
index 000000000000..6d411169bfa6
--- /dev/null
+++ b/scripts/gen_initramfs_list.sh
@@ -0,0 +1,203 @@
1#!/bin/bash
2# Copyright (C) Martin Schlemmer <azarah@nosferatu.za.org>
3# Released under the terms of the GNU GPL
4#
5# Generate a newline separated list of entries from the file/directory
6# supplied as an argument.
7#
8# If a file/directory is not supplied then generate a small dummy file.
9#
10# The output is suitable for gen_init_cpio built from usr/gen_init_cpio.c.
11#
12
13default_initramfs() {
14 cat <<-EOF
15 # This is a very simple, default initramfs
16
17 dir /dev 0755 0 0
18 nod /dev/console 0600 0 0 c 5 1
19 dir /root 0700 0 0
20 EOF
21}
22
23filetype() {
24 local argv1="$1"
25
26 # symlink test must come before file test
27 if [ -L "${argv1}" ]; then
28 echo "slink"
29 elif [ -f "${argv1}" ]; then
30 echo "file"
31 elif [ -d "${argv1}" ]; then
32 echo "dir"
33 elif [ -b "${argv1}" -o -c "${argv1}" ]; then
34 echo "nod"
35 elif [ -p "${argv1}" ]; then
36 echo "pipe"
37 elif [ -S "${argv1}" ]; then
38 echo "sock"
39 else
40 echo "invalid"
41 fi
42 return 0
43}
44
45print_mtime() {
46 local argv1="$1"
47 local my_mtime="0"
48
49 if [ -e "${argv1}" ]; then
50 my_mtime=$(find "${argv1}" -printf "%T@\n" | sort -r | head -n 1)
51 fi
52
53 echo "# Last modified: ${my_mtime}"
54 echo
55}
56
57parse() {
58 local location="$1"
59 local name="${location/${srcdir}//}"
60 # change '//' into '/'
61 name="${name//\/\///}"
62 local mode="$2"
63 local uid="$3"
64 local gid="$4"
65 local ftype=$(filetype "${location}")
66 # remap uid/gid to 0 if necessary
67 [ "$uid" -eq "$root_uid" ] && uid=0
68 [ "$gid" -eq "$root_gid" ] && gid=0
69 local str="${mode} ${uid} ${gid}"
70
71 [ "${ftype}" == "invalid" ] && return 0
72 [ "${location}" == "${srcdir}" ] && return 0
73
74 case "${ftype}" in
75 "file")
76 str="${ftype} ${name} ${location} ${str}"
77 ;;
78 "nod")
79 local dev_type=
80 local maj=$(LC_ALL=C ls -l "${location}" | \
81 gawk '{sub(/,/, "", $5); print $5}')
82 local min=$(LC_ALL=C ls -l "${location}" | \
83 gawk '{print $6}')
84
85 if [ -b "${location}" ]; then
86 dev_type="b"
87 else
88 dev_type="c"
89 fi
90 str="${ftype} ${name} ${str} ${dev_type} ${maj} ${min}"
91 ;;
92 "slink")
93 local target=$(LC_ALL=C ls -l "${location}" | \
94 gawk '{print $11}')
95 str="${ftype} ${name} ${target} ${str}"
96 ;;
97 *)
98 str="${ftype} ${name} ${str}"
99 ;;
100 esac
101
102 echo "${str}"
103
104 return 0
105}
106
107usage() {
108 printf "Usage:\n"
109 printf "$0 [ [-u <root_uid>] [-g <root_gid>] [-d | <cpio_source>] ] . . .\n"
110 printf "\n"
111 printf -- "-u <root_uid> User ID to map to user ID 0 (root).\n"
112 printf " <root_uid> is only meaningful if <cpio_source>\n"
113 printf " is a directory.\n"
114 printf -- "-g <root_gid> Group ID to map to group ID 0 (root).\n"
115 printf " <root_gid> is only meaningful if <cpio_source>\n"
116 printf " is a directory.\n"
117 printf "<cpio_source> File list or directory for cpio archive.\n"
118 printf " If <cpio_source> is not provided then a\n"
119 printf " a default list will be output.\n"
120 printf -- "-d Output the default cpio list. If no <cpio_source>\n"
121 printf " is given then the default cpio list will be output.\n"
122 printf "\n"
123 printf "All options may be repeated and are interpreted sequentially\n"
124 printf "and immediately. -u and -g states are preserved across\n"
125 printf "<cpio_source> options so an explicit \"-u 0 -g 0\" is required\n"
126 printf "to reset the root/group mapping.\n"
127}
128
129build_list() {
130 printf "\n#####################\n# $cpio_source\n"
131
132 if [ -f "$cpio_source" ]; then
133 print_mtime "$cpio_source"
134 cat "$cpio_source"
135 elif [ -d "$cpio_source" ]; then
136 srcdir=$(echo "$cpio_source" | sed -e 's://*:/:g')
137 dirlist=$(find "${srcdir}" -printf "%p %m %U %G\n" 2>/dev/null)
138
139 # If $dirlist is only one line, then the directory is empty
140 if [ "$(echo "${dirlist}" | wc -l)" -gt 1 ]; then
141 print_mtime "$cpio_source"
142
143 echo "${dirlist}" | \
144 while read x; do
145 parse ${x}
146 done
147 else
148 # Failsafe in case directory is empty
149 default_initramfs
150 fi
151 else
152 echo " $0: Cannot open '$cpio_source'" >&2
153 exit 1
154 fi
155}
156
157
158root_uid=0
159root_gid=0
160
161while [ $# -gt 0 ]; do
162 arg="$1"
163 shift
164 case "$arg" in
165 "-u")
166 root_uid="$1"
167 shift
168 ;;
169 "-g")
170 root_gid="$1"
171 shift
172 ;;
173 "-d")
174 default_list="$arg"
175 default_initramfs
176 ;;
177 "-h")
178 usage
179 exit 0
180 ;;
181 *)
182 case "$arg" in
183 "-"*)
184 printf "ERROR: unknown option \"$arg\"\n" >&2
185 printf "If the filename validly begins with '-', then it must be prefixed\n" >&2
186 printf "by './' so that it won't be interpreted as an option." >&2
187 printf "\n" >&2
188 usage >&2
189 exit 1
190 ;;
191 *)
192 cpio_source="$arg"
193 build_list
194 ;;
195 esac
196 ;;
197 esac
198done
199
200# spit out the default cpio list if a source hasn't been specified
201[ -z "$cpio_source" -a -z "$default_list" ] && default_initramfs
202
203exit 0
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-22 20:14:28 -0500