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