common: add chroot-style 'ethereal'
This commit is contained in:
maxice8
maxice8
parent
62aaae3978
commit
fadca94b98
|
|
@ -0,0 +1,135 @@
|
|||
#!/bin/sh
|
||||
#
|
||||
# This chroot script uses symlinks to emulate being in a chroot using
|
||||
# the host system as the masterdir
|
||||
#
|
||||
# It will damage your host system, only use it in disposable
|
||||
# containers.
|
||||
#
|
||||
# 2 extra steps required when using this chroot-style:
|
||||
# 1. Symlink / to masterdir inside the void-packages repo
|
||||
# 2. write the arch of the host system, as dictated by xbps-uhelper arch
|
||||
# into /.xbps_chroot_init
|
||||
#
|
||||
# The supported way to make use of thie chroot-style is to create
|
||||
# a root filesystem that has base-chroot and git installed and
|
||||
# have it inside a container engine like Docker.
|
||||
#
|
||||
# Docker example:
|
||||
# $ mkdir -p /tmp/image
|
||||
# $ xbps-install -y -r /tmp/image \
|
||||
# -R http://mirrors.servercentral.com/voidlinux/current \
|
||||
# -S base-chroot
|
||||
# $ tar -pC /tmp/image -c . | sudo docker import - voidlinux/masterdir
|
||||
# $ rm -rf /tmp/image
|
||||
# # docker run --rm -it \
|
||||
# -e XBPS_CHROOT_CMD=ethereal \
|
||||
# -e XBPS_ALLOW_CHROOT_BREAKOUT=yes \
|
||||
# -v $(pwd):/hostrepo voidlinux/masterdir \
|
||||
# /bin/bash -c 'ln -s / /hostrepo/masterdir && /hostrepo/xbps-src pkg <pkgname>'
|
||||
#
|
||||
|
||||
readonly MASTERDIR="$1"
|
||||
readonly DISTDIR="$2"
|
||||
readonly HOSTDIR="$3"
|
||||
readonly EXTRA_ARGS="$4"
|
||||
readonly CMD="$5"
|
||||
shift 5
|
||||
|
||||
if [ -z "$MASTERDIR" -o -z "$DISTDIR" ]; then
|
||||
echo "$0 MASTERDIR/DISTDIR not set"
|
||||
exit 1
|
||||
fi
|
||||
|
||||
msg_red() {
|
||||
# error messages in bold/red
|
||||
[ -n "$NOCOLORS" ] || printf >&2 "\033[1m\033[31m"
|
||||
printf "=> ERROR: %s\\n" "$@"
|
||||
[ -n "$NOCOLORS" ] || printf >&2 "\033[m"
|
||||
}
|
||||
|
||||
fake_mount() {
|
||||
# If we already have a symlink from the desired place
|
||||
# to the base location then just return 0
|
||||
if [ -L "$2" -a "$(readlink "$2")" = "$1" ]; then
|
||||
return 0
|
||||
fi
|
||||
|
||||
if [ -d "$2" ] && ! rmdir "$2" >/dev/null 2>&1; then
|
||||
msg_red "Failed to remove $2, not empty ?\n"
|
||||
exit 1
|
||||
fi
|
||||
|
||||
[ -f "$2" -o -L "$2" ] && rm -f "$2"
|
||||
|
||||
ln -s "$1" "$2"
|
||||
echo "linked $1 -> $2"
|
||||
}
|
||||
|
||||
if [ "${XBPS_ALLOW_CHROOT_BREAKOUT}" != "yes" ]; then
|
||||
msg_red "chroot-style 'ethereal' requires XBPS_ALLOW_CHROOT_BREAKOUT=yes\n"
|
||||
msg_red "This chroot-style is meant for disposable containers and will destroy your system\n"
|
||||
exit 1
|
||||
fi
|
||||
|
||||
if [ ! -L "$MASTERDIR" -o "$(readlink "$MASTERDIR")" != "/" ]; then
|
||||
msg_red "$MASTERDIR isn't symlinked to /!\n"
|
||||
exit 1
|
||||
fi
|
||||
|
||||
fake_mount "$DISTDIR" "$MASTERDIR"/void-packages
|
||||
|
||||
# Do the same for hostdir
|
||||
if [ -n "$HOSTDIR" ]; then
|
||||
fake_mount "$HOSTDIR" "$MASTERDIR"/host
|
||||
fi
|
||||
|
||||
# xbps-src may send some other binds, parse them here
|
||||
while getopts 'b:' c -- "$EXTRA_ARGS"; do
|
||||
# Skip everything that's not a bind
|
||||
[ "$c" = "b" ] || continue
|
||||
|
||||
from="${OPTARG%:*}"
|
||||
to="${OPTARG#*:}"
|
||||
|
||||
fake_mount "$from" "$to"
|
||||
|
||||
mounts="${mounts} $to"
|
||||
done
|
||||
|
||||
# Store current directory for returning later
|
||||
OLDPWD="$(pwd)"
|
||||
|
||||
# To give the illusion we entered the chroot, cd to /
|
||||
cd / || {
|
||||
msg_red "Failed to change directory to root!\n"
|
||||
exit 1 ; }
|
||||
|
||||
# Tell xbps-src that we are "in the chroot"
|
||||
# Start with `env` so our environment var's stay the same
|
||||
env IN_CHROOT=1 $CMD $@
|
||||
|
||||
# Store return of the command we care about
|
||||
ret="$?"
|
||||
|
||||
# Return to OLDPWD
|
||||
cd "${OLDPWD}"
|
||||
|
||||
# Remove the symlink and restore an empty dir to simulate
|
||||
# an umount operation.
|
||||
if [ -n "$HOSTDIR" ]; then
|
||||
rm -f "$MASTERDIR"/host
|
||||
mkdir -p "$MASTERDIR"/host
|
||||
fi
|
||||
|
||||
# Same as the operation above, do it all for all mountpoints
|
||||
# that were passed to us.
|
||||
for m in $mounts; do
|
||||
rm -f "$m"
|
||||
mkdir -p "$m"
|
||||
done
|
||||
|
||||
rm -f "$MASTERDIR"/void-packages
|
||||
mkdir -p "$MASTERDIR"/void-packages
|
||||
|
||||
exit $ret
|
||||
|
|
@ -216,6 +216,7 @@ chroot_handler() {
|
|||
env -i -- PATH="/usr/bin:/usr/sbin:$PATH" SHELL=/bin/sh \
|
||||
HOME=/tmp IN_CHROOT=1 LC_COLLATE=C LANG=en_US.UTF-8 \
|
||||
SOURCE_DATE_EPOCH="$SOURCE_DATE_EPOCH" \
|
||||
XBPS_ALLOW_CHROOT_BREAKOUT="$XBPS_ALLOW_CHROOT_BREAKOUT" \
|
||||
$XBPS_COMMONDIR/chroot-style/${XBPS_CHROOT_CMD:=uunshare}.sh \
|
||||
$XBPS_MASTERDIR $XBPS_DISTDIR "$XBPS_HOSTDIR" "$XBPS_CHROOT_CMD_ARGS" \
|
||||
/void-packages/xbps-src $action $pkg
|
||||
|
|
|
|||
|
|
@ -114,6 +114,7 @@ XBPS_SUCMD="sudo /bin/sh -c"
|
|||
# - uchroot (uses xbps-uchroot(8), namespaces, setgid)
|
||||
# - proot (uses proot, external, does not need special permissions)
|
||||
# - bwrap (uses bwrap, external, does not need special permissions)
|
||||
# - ethereal (uses root, needs no permissions, for disposable containers)
|
||||
#
|
||||
# The order is already set as shown above, but can be overriden below.
|
||||
# Additional arguments to the chroot style can be passed in via XBPS_CHROOT_CMD_ARGS.
|
||||
|
|
@ -126,3 +127,9 @@ XBPS_SUCMD="sudo /bin/sh -c"
|
|||
# the HEAD commit time.
|
||||
#
|
||||
#XBPS_USE_BUILD_MTIME=yes
|
||||
|
||||
# [OPTIONAL]
|
||||
# When using the 'ethereal' chroot-style this switch must be activated, it is
|
||||
# meant as safeguard against users casually destroying their systems
|
||||
#
|
||||
#XBPS_ALLOW_CHROOT_BREAKOUT=yes
|
||||
|
|
|
|||
Loading…
Reference in New Issue