fi
link_files "${src}" "${dest}" "${src_mask}"
else
- if [ -e "${dest}" ];
- then
- rm -rf "${dest}"
- fi
- if [ -n "${src}" ];
+ if [ -n "${src_mask}" ]
then
src="$(echo ${src} | sed "s|^${src_mask}||")"
fi
+ rm -rf "${dest}" 2> /dev/null
ln -s "${src}" "${dest}"
fi
done
}
+
+do_union () {
+ local unionmountpoint="${1}" # directory where the union is mounted
+ local unionrw="${2}" # branch where the union changes are stored
+ local unionro1="${3}" # first underlying read-only branch (optional)
+ local unionro2="${4}" # second underlying read-only branch (optional)
+
+ if [ "${UNIONTYPE}" = "aufs" ]
+ then
+ rw_opt="rw"
+ ro_opt="rr+wh"
+ noxino_opt="noxino"
+ elif [ "${UNIONTYPE}" = "unionfs-fuse" ]
+ then
+ rw_opt="RW"
+ ro_opt="RO"
+ else
+ rw_opt="rw"
+ ro_opt="ro"
+ fi
+
+ case "${UNIONTYPE}" in
+ unionfs-fuse)
+ unionmountopts="-o cow -o noinitgroups -o default_permissions -o allow_other -o use_ino -o suid"
+ unionmountopts="${unionmountopts} ${unionrw}=${rw_opt}"
+ if [ -n "${unionro1}" ]
+ then
+ unionmountopts="${unionmountopts}:${unionro1}=${ro_opt}"
+ fi
+ if [ -n "${unionro2}" ]
+ then
+ unionmountopts="${unionmountopts}:${unionro2}=${ro_opt}"
+ fi
+ ( sysctl -w fs.file-max=391524 ; ulimit -HSn 16384
+ unionfs-fuse ${unionmountopts} "${unionmountpoint}" ) && \
+ ( mkdir -p /run/sendsigs.omit.d
+ pidof unionfs-fuse >> /run/sendsigs.omit.d/unionfs-fuse || true )
+ ;;
+
+ overlayfs)
+ # XXX: can unionro2 be used? (overlayfs only handles two dirs, but perhaps they can be chained?)
+ # XXX: and can unionro1 be optional? i.e. can overlayfs skip lowerdir?
+ unionmountopts="-o noatime,lowerdir=${unionro1},upperdir=${unionrw}"
+ mount -t ${UNIONTYPE} ${unionmountopts} ${UNIONTYPE} "${unionmountpoint}"
+ ;;
+
+ *)
+ unionmountopts="-o noatime,${noxino_opt},dirs=${unionrw}=${rw_opt}"
+ if [ -n "${unionro1}" ]
+ then
+ unionmountopts="${unionmountopts}:${unionro1}=${ro_opt}"
+ fi
+ if [ -n "${unionro2}" ]
+ then
+ unionmountopts="${unionmountopts}:${unionro2}=${ro_opt}"
+ fi
+ mount -t ${UNIONTYPE} ${unionmountopts} ${UNIONTYPE} "${unionmountpoint}"
+ ;;
+ esac
+}
+
+get_custom_mounts () {
+ # Side-effect: leaves $devices with live.persist mounted in ${rootmnt}/live/persistent
+ # Side-effect: prints info to file $custom_mounts
+
+ local devices="${1}"
+ local custom_mounts="${2}" # print result to this file
+ local rootmnt="${3}" # should be set empty post-live-boot
+
+ local bindings="/bindings.list"
+ local links="/links.list"
+ rm -rf ${bindings} ${links} 2> /dev/null
+ local persistent_backing="${rootmnt}/live/persistent"
+
+ for device in ${devices}
+ do
+ if [ ! -b "${device}" ]
+ then
+ continue
+ fi
+ local device_name="$(basename ${device})"
+ local backing="${persistent_backing}/${device_name}"
+ mkdir -p "${backing}"
+ local device_fstype="$(get_fstype ${device})"
+ if [ -z "${PERSISTENT_READONLY}" ]
+ then
+ device_mount_opts="rw,noatime"
+ else
+ device_mount_opts="ro,noatime"
+ fi
+ local device_used=""
+ mount -t "${device_fstype}" -o "${device_mount_opts}" "${device}" "${backing}"
+ local include_list="${backing}/${persistence_list}"
+ if [ ! -r "${include_list}" ]
+ then
+ umount "${backing}"
+ rmdir "${backing}"
+ continue
+ fi
+
+ [ "${DEBUG}" = "Yes" ] && cp ${include_list} ${persistent_backing}/${persistence_list}.${device_name}
+ while read source dest options # < ${include_list}
+ do
+ if echo ${source} | grep -qe "^[[:space:]]*\(#.*\)\?$"
+ then
+ # skipping empty or commented lines
+ continue
+ fi
+
+ if echo ${dest} | grep -qe "^[^/]"
+ then
+ options="${dest}"
+ dest="${source}"
+ elif [ -z "${dest}" ]
+ then
+ dest="${source}"
+ fi
+
+ if echo ${dest} | grep -qe "^/\+$\|^/\+live\(/.*\)\?$"
+ then
+ # mounting on / or /live could cause trouble
+ log_warning_msg "Skipping unsafe custom mount on ${dest}"
+ continue
+ fi
+
+ for opt in $(echo ${options} | tr ',' ' ');
+ do
+ case "${opt}" in
+ linkfiles|union)
+ ;;
+ *)
+ log_warning_msg "Skipping custom mount with unkown option: ${opt}"
+ continue 2
+ ;;
+ esac
+ done
+
+ # FIXME: handle case: we already have /a/b in
+ # $bindings added from current $device, but
+ # now we find /a -- /a should replace /a/b in
+ # $bindings.
+
+ # FIXME: handle case: we have /a in $bindings
+ # from current $device, now we find /a/b, so
+ # we skip /a/b
+
+ # ensure that no multiple-/ occur in paths
+ local full_source="$(echo ${backing}/${source}/ | sed -e 's|/\+|/|g')"
+ local full_dest="$(echo ${rootmnt}/${dest}/ | sed -e 's|/\+|/|g')"
+ device_used="yes"
+ if echo ${options} | grep -qe "\<linkfiles\>";
+ then
+ echo "${full_source} ${full_dest} ${options}" >> ${links}
+ else
+ echo "${full_source} ${full_dest} ${options}" >> ${bindings}
+ fi
+ done < ${include_list}
+
+ if [ -z "${device_used}" ]
+ then
+ # this device was not used for / earlier, or
+ # custom mount point now, so it's useless
+ umount "${backing}"
+ rmdir "${backing}"
+ fi
+ done
+
+ # We sort the list according to destination so we're sure that
+ # we won't hide a previous mount. We also ignore duplicate
+ # destinations in a more or less arbitrary way.
+ [ -e "${bindings}" ] && sort -k2 -sbu ${bindings} >> ${custom_mounts}
+ rm ${bindings}
+
+ # After all mounts are considered we add symlinks so they
+ # won't be hidden by some mount.
+ [ -e "${links}" ] && sort -k2 -sbu ${links} >> ${custom_mounts}
+ rm ${links}
+
+ rm -f ${bindings} ${links} 2> /dev/null
+ echo ${custom_mounts}
+}
+
+do_custom_mounts () {
+ local custom_mounts="${1}" # the ouput from get_custom_mounts()
+ local rootmnt="${2}" # should be set empty post-live-boot
+
+ while read source dest options # < ${custom_mounts}
+ do
+ local opt_linkfiles=""
+ local opt_union=""
+ for opt in $(echo ${options} | tr ',' ' ');
+ do
+ case "${opt}" in
+ linkfiles)
+ opt_linkfiles="yes"
+ ;;
+ union)
+ opt_union="yes"
+ ;;
+ esac
+ done
+
+ if mountpoint -q "${dest}";
+ then
+ log_warning_msg "Skipping custom mount ${source} on ${dest}: destination is already a mount point"
+ continue
+ fi
+
+ # FIXME: we don't handle already existing
+ # non-directory files in the paths of both $source and
+ # $dest.
+
+ if [ ! -d "${dest}" ]
+ then
+ # if ${dest} is in /home/$user, try fixing
+ # proper ownership
+ # FIXME: this should really be handled by
+ # live-config since we don't know for sure
+ # which uid a certain user has until then
+ if echo ${dest} | grep -qe "^${rootmnt}/*home/\+[^/]\+"
+ then
+ path="/"
+ for dir in $(echo ${dest} | sed -e 's|/\+| |g')
+ do
+ path=${path}/${dir}
+ if [ ! -e ${path} ]
+ then
+ mkdir -p ${path}
+ # assume that the intended user is the first, which is usually the case
+ chown 1000:1000 ${path}
+ fi
+ done
+ else
+ mkdir -p ${dest}
+ fi
+ fi
+
+ # if ${source} doesn't exist on our persistent media
+ # we bootstrap it with $dest from the live filesystem.
+ # this both makes sense and is critical if we're
+ # dealing with /etc or other system dir.
+ if [ ! -d "${source}" ]
+ then
+ if [ -n "${PERSISTENT_READONLY}" ] || [ -n "${opt_linkfiles}" ]
+ then
+ continue
+ elif [ -n "${opt_union}" ]
+ then
+ # union's don't need to be bootstrapped
+ mkdir "${source}"
+ else
+ # ensure that $dest is not copied *into* $source
+ mkdir -p "$(dirname ${source})"
+ cp -a "${dest}" "${source}"
+ fi
+ fi
+
+ rofs_dest_backing=""
+ for d in ${rootmnt}/live/rofs/*
+ do
+ if [ -n "${rootmnt}" ]
+ then
+ rofs_dest_backing="${d}/$(echo ${dest} | sed -e "s|${rootmnt}||")"
+ else
+ rofs_dest_backing="${d}/${dest}"
+
+ fi
+ if [ -d "${rofs_dest_backing}" ]
+ then
+ break
+ else
+ rofs_dest_backing=""
+ fi
+ done
+
+ if [ -z "${PERSISTENT_READONLY}" ]
+ then
+ if [ -n "${opt_linkfiles}" ]
+ then
+ links_source="${source}"
+ links_dest="${dest}"
+ elif [ -n "${opt_union}" ]
+ then
+ do_union ${dest} ${source} ${rofs_dest_backing}
+ else
+ mount --bind "${source}" "${dest}"
+ fi
+ else
+ if [ -n "${opt_linkfiles}" ]
+ then
+ links_dest="${dest}"
+ dest="$(mktemp -d ${persistent_backing}/links_source-XXXXXX)"
+ links_source="${dest}"
+ fi
+ if [ -n "${rootmnt}" ]
+ then
+ cow_dir="$(echo ${dest} | sed -e "s|${rootmnt}|/cow/|")"
+ else
+ cow_dir="/live/cow/${dest}"
+ fi
+ mkdir -p ${cow_dir}
+ do_union ${dest} ${cow_dir} ${source} ${rofs_dest_backing}
+ fi
+
+ if [ -n "${opt_linkfiles}" ]
+ then
+ link_files "${links_source}" "${links_dest}" "${rootmnt}"
+ fi
+
+ PERSISTENCE_IS_ON="1"
+ export PERSISTENCE_IS_ON
+ done < ${custom_mounts}
+}
projects / live-boot-grml.git / blobdiff