1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
|
#!/bin/bash
set -ex
apt-get -y install --no-install-recommends \
ca-certificates \
initramfs-tools \
libpng16-16 \
strace \
libsensors5 \
libexpat1 \
libdrm2 \
libdrm-nouveau2 \
firmware-qcom-media \
wget \
xz-utils
passwd root -d
chsh -s /bin/sh
cat > /init <<EOF
#!/bin/sh
export PS1=lava-shell:
exec sh
EOF
chmod +x /init
mkdir -p /lib/firmware/rtl_nic
wget https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/tree/rtl_nic/rtl8153a-3.fw -O /lib/firmware/rtl_nic/rtl8153a-3.fw
#######################################################################
# Strip the image to a small minimal system without removing the debian
# toolchain.
# xz compress firmware so it doesn't waste RAM at runtime. Except db820c's
# GPU firmware, due to using a precompiled kernel without compression support.
find /lib/firmware -type f -print0 | \
grep -vz a530 | \
xargs -0r -P4 -n4 xz -T1 -C crc32
ln -s /lib/firmware/qcom/a530* /lib/firmware/
# Copy timezone file and remove tzdata package
rm -rf /etc/localtime
cp /usr/share/zoneinfo/Etc/UTC /etc/localtime
UNNEEDED_PACKAGES="libfdisk1
tzdata
diffutils"
export DEBIAN_FRONTEND=noninteractive
# Removing unused packages
for PACKAGE in ${UNNEEDED_PACKAGES}
do
echo ${PACKAGE}
if ! apt-get remove --purge --yes "${PACKAGE}"
then
echo "WARNING: ${PACKAGE} isn't installed"
fi
done
apt-get autoremove --yes || true
# Dropping logs
rm -rf /var/log/*
# Dropping documentation, localization, i18n files, etc
rm -rf /usr/share/doc/*
rm -rf /usr/share/locale/*
rm -rf /usr/share/man
rm -rf /usr/share/i18n/*
rm -rf /usr/share/info/*
rm -rf /usr/share/lintian/*
rm -rf /usr/share/common-licenses/*
rm -rf /usr/share/mime/*
# Dropping reportbug scripts
rm -rf /usr/share/bug
# Drop udev hwdb not required on a stripped system
rm -rf /lib/udev/hwdb.bin /lib/udev/hwdb.d/*
# Drop all gconv conversions && binaries
rm -rf usr/bin/iconv
rm -rf usr/sbin/iconvconfig
rm -rf usr/lib/*/gconv/
# Remove libusb database
rm -rf usr/sbin/update-usbids
rm -rf var/lib/usbutils/usb.ids
rm -rf usr/share/misc/usb.ids
#######################################################################
# Crush into a minimal production image to be deployed via some type of image
# updating system.
# IMPORTANT: The Debian system is not longer functional at this point,
# for example, apt and dpkg will stop working
UNNEEDED_PACKAGES="apt libapt-pkg5.0 "\
"ncurses-bin ncurses-base libncursesw5 libncurses5 "\
"perl-base "\
"debconf libdebconfclient0 "\
"e2fsprogs e2fslibs libfdisk1 "\
"insserv "\
"udev "\
"init-system-helpers "\
"bash "\
"cpio "\
"xz-utils "\
"passwd "\
"libsemanage1 libsemanage-common "\
"libsepol1 "\
"gpgv "\
"hostname "\
"adduser "\
"debian-archive-keyring "\
# Removing unneeded packages
for PACKAGE in ${UNNEEDED_PACKAGES}
do
echo "Forcing removal of ${PACKAGE}"
if ! dpkg --purge --force-remove-essential --force-depends "${PACKAGE}"
then
echo "WARNING: ${PACKAGE} isn't installed"
fi
done
# Show what's left package-wise before dropping dpkg itself
COLUMNS=300 dpkg-query -W --showformat='${Installed-Size;10}\t${Package}\n' | sort -k1,1n
# Drop dpkg
dpkg --purge --force-remove-essential --force-depends dpkg
# No apt or dpkg, no need for its configuration archives
rm -rf etc/apt
rm -rf etc/dpkg
# Drop directories not part of ostree
# Note that /var needs to exist as ostree bind mounts the deployment /var over
# it
rm -rf var/* opt srv share
# ca-certificates are in /etc drop the source
rm -rf usr/share/ca-certificates
# No bash, no need for completions
rm -rf usr/share/bash-completion
# No zsh, no need for comletions
rm -rf usr/share/zsh/vendor-completions
# drop gcc-6 python helpers
rm -rf usr/share/gcc-6
# Drop sysvinit leftovers
rm -rf etc/init.d
rm -rf etc/rc[0-6S].d
# Drop upstart helpers
rm -rf etc/init
# Various xtables helpers
rm -rf usr/lib/xtables
# Drop all locales
# TODO: only remaining locale is actually "C". Should we really remove it?
rm -rf usr/lib/locale/*
# partition helpers
rm usr/sbin/*fdisk
# local compiler
rm usr/bin/localedef
# Systemd dns resolver
find usr etc -name '*systemd-resolve*' -prune -exec rm -r {} \;
# Systemd network configuration
find usr etc -name '*networkd*' -prune -exec rm -r {} \;
# systemd ntp client
find usr etc -name '*timesyncd*' -prune -exec rm -r {} \;
# systemd hw database manager
find usr etc -name '*systemd-hwdb*' -prune -exec rm -r {} \;
# No need for fuse
find usr etc -name '*fuse*' -prune -exec rm -r {} \;
# lsb init function leftovers
rm -rf usr/lib/lsb
# Only needed when adding libraries
rm usr/sbin/ldconfig*
# Games, unused
rmdir usr/games
# Remove pam module to authenticate against a DB
# plus libdb-5.3.so that is only used by this pam module
rm usr/lib/*/security/pam_userdb.so
rm usr/lib/*/libdb-5.3.so
# remove NSS support for nis, nisplus and hesiod
rm usr/lib/*/libnss_hesiod*
rm usr/lib/*/libnss_nis*
|
