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Commit | Line | Data |
---|---|---|
36c3082a | 1 | #!/bin/bash -e |
dc24f4e1 | 2 | |
35fd42a7 | 3 | bootstrap() { |
deeffdc9 | 4 | [[ $(id -u) -eq 0 ]] || exec sudo env -uUNSHARE HOME="$HOME" "$0" "$@" |
a5307b94 | 5 | |
35fd42a7 MF |
6 | if [[ -z ${UNSHARE} ]] ; then |
7 | mount_args= | |
8 | if type -P unshare >&/dev/null ; then | |
65050245 | 9 | test_arg() { unshare "$@" -- true >&/dev/null && uargs+=( "$@" ) || :; } |
be7880e1 | 10 | uargs=( -m ) |
587fdaa2 MF |
11 | test_arg -u |
12 | test_arg -i | |
13 | test_arg -p -f --mount-proc | |
14 | test_arg --propagation=private | |
be7880e1 | 15 | UNSHARE=true exec unshare "${uargs[@]}" -- "$0" "$@" |
35fd42a7 MF |
16 | fi |
17 | else | |
18 | mount_args='-n' | |
f2ff891e | 19 | fi |
35fd42a7 | 20 | unset UNSHARE |
a5307b94 MF |
21 | } |
22 | ||
dc24f4e1 | 23 | maybe_mount() { |
a5307b94 MF |
24 | local src=/$1 dst=${chroot}/${2:-$1} |
25 | [[ -d ${src} ]] || return 0 | |
35fd42a7 MF |
26 | if ! mkdir -p "${dst}" ; then |
27 | [[ -w ${chroot} ]] && exit 1 || return 0 | |
28 | fi | |
f2ff891e | 29 | grep -sq "${dst}" /proc/mounts || mount ${mount_args} --bind "${src}" "${dst}" |
dc24f4e1 | 30 | } |
dc24f4e1 MF |
31 | |
32 | get_type() { | |
33 | case $(file "$1") in | |
35fd42a7 MF |
34 | *x86-64*) echo x86_64;; |
35 | *"Intel 80386"*) echo i386;; | |
36 | *32-bit*PowerPC*) echo ppc;; | |
37 | *64-bit*PowerPC*) echo ppc64;; | |
38 | *32-bit*S/390*) echo s390;; | |
39 | *64-bit*S/390*) echo s390x;; | |
95ef1dd2 MF |
40 | *64-bit*MIPS*) echo mips64;; |
41 | *32-bit*MIPS*N32*)echo mips64;; | |
42 | *32-bit*MIPS*) echo mips;; | |
0e502db0 MF |
43 | *32-bit*PA-RISC*) echo parisc;; |
44 | *64-bit*PA-RISC*) echo parisc64;; | |
45 | *32-bit*SPARC*) echo sparc;; | |
46 | *64-bit*SPARC*) echo sparc64;; | |
dc24f4e1 MF |
47 | esac |
48 | } | |
35fd42a7 MF |
49 | |
50 | init_chroot() { | |
51 | [[ -w . ]] || return 0 | |
52 | ||
53 | if [[ ! -L etc/mtab ]] ; then | |
9ebe6122 | 54 | ln -sfT /proc/mounts etc/mtab |
35fd42a7 | 55 | fi |
9ebe6122 | 56 | local f dst |
35fd42a7 MF |
57 | local etc=( |
58 | hosts | |
59 | locale.gen | |
60 | localtime | |
61 | resolv.conf | |
62 | ) | |
63 | local home=( | |
64 | .inputrc | |
65 | .gdbinit | |
66 | .gitconfig | |
67 | .nanorc | |
68 | ) | |
69 | for f in \ | |
70 | $(printf 'etc/%s ' "${etc[@]}") \ | |
71 | ; do | |
9ebe6122 MF |
72 | if [[ -e /${f} ]] ; then |
73 | cp "/${f}" "${f}" | |
35fd42a7 MF |
74 | fi |
75 | done | |
76 | for f in "${home[@]}" ; do | |
9ebe6122 MF |
77 | df="root/${f}" |
78 | f="${HOME}/${f}" | |
79 | if [[ -e ${f} ]] ; then | |
80 | cp "${f}" "${df}" | |
81 | fi | |
35fd42a7 | 82 | done |
9ebe6122 | 83 | |
584a84ce MF |
84 | if [[ ! -d root/.git ]] ; then |
85 | f="${HOME}/.profile.d/aliases.sh" | |
86 | if [[ -e ${f} ]] ; then | |
87 | cat "${f}" > root/.bash_profile | |
88 | fi | |
9ebe6122 | 89 | fi |
35fd42a7 MF |
90 | } |
91 | ||
92 | usage() { | |
93 | cat <<-EOF | |
94 | Usage: ${0##*/} [options] [program to run] | |
95 | ||
96 | Sets up common mount points and then chroots in and runs a program. | |
97 | If no program is specified, then launch a login shell. | |
98 | ||
99 | Options: | |
100 | -u Unmount all paths in the chroot | |
101 | -m <path> Add path to mount list | |
102 | -d <dir> Use <dir> as chroot (defaults to ${0%/*}) | |
103 | -h This help screen | |
104 | EOF | |
105 | exit | |
106 | } | |
107 | ||
108 | main() { | |
109 | bootstrap "$@" | |
110 | ||
c3e618ce | 111 | local mounts=( proc sys tmp dev dev/pts dev/shm run usr/portage usr/portage/distfiles usr/local/src ) |
35fd42a7 MF |
112 | |
113 | local chroot=${0%/*} | |
114 | case ${chroot} in | |
115 | .) chroot=${PWD} ;; | |
116 | ./*) chroot=${PWD}/${chroot#./} ;; | |
117 | esac | |
118 | ||
119 | local cmd | |
120 | while [[ -n $1 ]] ; do | |
121 | case $1 in | |
122 | -u) cmd='umount' ;; | |
123 | -m) mounts+=( "$2" ); shift ;; | |
124 | -d) chroot=$(realpath "$2"); shift ;; | |
8b6a28cd | 125 | --help|-h) usage ;; |
35fd42a7 MF |
126 | -*) echo "${0##*/}: unknown option $1"; exit 1 ;; |
127 | *) break ;; | |
128 | esac | |
129 | shift | |
130 | done | |
131 | cd "${chroot}" | |
132 | ||
133 | case ${cmd} in | |
134 | umount) exec "${0%/*}/umount-tree" -y "${chroot}" ;; | |
135 | esac | |
136 | ||
137 | local m | |
138 | for m in "${mounts[@]}" ; do | |
139 | maybe_mount ${m} | |
140 | done | |
141 | ||
142 | init_chroot | |
143 | ||
144 | local setarch | |
145 | if type -P setarch &>/dev/null ; then | |
146 | local bin_dst=$(get_type bin/bash) | |
147 | if [[ -n ${bin_dst} ]] ; then | |
148 | setarch="setarch ${bin_dst}" | |
149 | fi | |
d1eee076 | 150 | fi |
35fd42a7 | 151 | |
917d2f98 MF |
152 | # Doubtful these settings we want to leak into the chroot. |
153 | unset ROOT PORTAGE_CONFIGROOT LD_LIBRARY_PATH | |
35fd42a7 MF |
154 | unset LS_COLORS # format changes over time |
155 | [[ $# -eq 0 ]] && set -- env HOME=/root /bin/bash -l | |
156 | exec \ | |
157 | ${setarch} \ | |
158 | chroot "${chroot}" \ | |
159 | "$@" | |
160 | } | |
161 | ||
162 | main "$@" |