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#!/bin/sh
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#
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# SPDX-License-Identifier: GPL-2.0-only
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#
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### BEGIN INIT INFO
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# Provides: volatile
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# Required-Start: $local_fs
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# Required-Stop: $local_fs
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# Default-Start: S
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# Default-Stop:
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# Short-Description: Populate the volatile filesystem
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### END INIT INFO
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# Get ROOT_DIR
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DIRNAME="$(dirname "$0")"
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ROOT_DIR="$(echo "$DIRNAME" | sed -ne 's:/etc/.*::p')"
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[ -e "${ROOT_DIR}/etc/default/rcS" ] && . "${ROOT_DIR}/etc/default/rcS"
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# When running populate-volatile.sh at rootfs time, disable cache.
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[ -n "$ROOT_DIR" ] && VOLATILE_ENABLE_CACHE=no
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# If rootfs is read-only, disable cache.
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[ "$ROOTFS_READ_ONLY" = "yes" ] && VOLATILE_ENABLE_CACHE=no
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CFGDIR="${ROOT_DIR}/etc/default/volatiles"
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TMPROOT="${ROOT_DIR}/var/volatile/tmp"
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COREDEF="00_core"
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[ "${VERBOSE}" != "no" ] && echo "Populating volatile Filesystems."
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create_file() {
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EXEC=""
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if [ -z "$2" ]; then
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EXEC="
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touch \"$1\";
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"
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else
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EXEC="
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cp \"$2\" \"$1\";
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"
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fi
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EXEC="
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${EXEC}
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chown ${TUSER}:${TGROUP} $1 || echo \"Failed to set owner -${TUSER}- for -$1-.\";
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chmod ${TMODE} $1 || echo \"Failed to set mode -${TMODE}- for -$1-.\" "
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test "$VOLATILE_ENABLE_CACHE" = yes && echo "$EXEC" >> /etc/volatile.cache.build
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if [ -e "$1" ]; then
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[ "${VERBOSE}" != "no" ] && echo "Target already exists. Skipping."
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else
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if [ -z "$ROOT_DIR" ]; then
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eval "$EXEC"
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else
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# Creating some files at rootfs time may fail and should fail,
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# but these failures should not be logged to make sure the do_rootfs
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# process doesn't fail. This does no harm, as this script will
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# run on target to set up the correct files and directories.
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eval "$EXEC" > /dev/null 2>&1
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fi
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fi
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}
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mk_dir() {
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EXEC="
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mkdir -p \"$1\";
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chown ${TUSER}:${TGROUP} $1 || echo \"Failed to set owner -${TUSER}- for -$1-.\";
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chmod ${TMODE} $1 || echo \"Failed to set mode -${TMODE}- for -$1-.\" "
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test "$VOLATILE_ENABLE_CACHE" = yes && echo "$EXEC" >> /etc/volatile.cache.build
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if [ -e "$1" ]; then
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[ "${VERBOSE}" != "no" ] && echo "Target already exists. Skipping."
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else
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if [ -z "$ROOT_DIR" ]; then
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eval "$EXEC"
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else
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# For the same reason with create_file(), failures should
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# not be logged.
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eval "$EXEC" > /dev/null 2>&1
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fi
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fi
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}
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link_file() {
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EXEC="
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if [ -L \"$2\" ]; then
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[ \"\$(readlink \"$2\")\" != \"$1\" ] && { rm -f \"$2\"; ln -sf \"$1\" \"$2\"; };
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elif [ -d \"$2\" ]; then
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if awk '\$2 == \"$2\" {exit 1}' /proc/mounts; then
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cp -a $2/* $1 2>/dev/null;
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cp -a $2/.[!.]* $1 2>/dev/null;
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rm -rf \"$2\";
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ln -sf \"$1\" \"$2\";
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fi
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else
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ln -sf \"$1\" \"$2\";
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fi
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"
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test "$VOLATILE_ENABLE_CACHE" = yes && echo " $EXEC" >> /etc/volatile.cache.build
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if [ -z "$ROOT_DIR" ]; then
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eval "$EXEC"
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else
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# For the same reason with create_file(), failures should
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# not be logged.
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eval "$EXEC" > /dev/null 2>&1
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fi
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}
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check_requirements() {
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cleanup() {
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rm "${TMP_INTERMED}"
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rm "${TMP_DEFINED}"
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rm "${TMP_COMBINED}"
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}
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CFGFILE="$1"
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TMP_INTERMED="${TMPROOT}/tmp.$$"
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TMP_DEFINED="${TMPROOT}/tmpdefined.$$"
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TMP_COMBINED="${TMPROOT}/tmpcombined.$$"
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sed 's@\(^:\)*:.*@\1@' "${ROOT_DIR}/etc/passwd" | sort | uniq > "${TMP_DEFINED}"
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grep -v "^#" "${CFGFILE}" | cut -s -d " " -f 2 > "${TMP_INTERMED}"
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cat "${TMP_DEFINED}" "${TMP_INTERMED}" | sort | uniq > "${TMP_COMBINED}"
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NR_DEFINED_USERS="$(wc -l < "${TMP_DEFINED}")"
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NR_COMBINED_USERS="$(wc -l < "${TMP_COMBINED}")"
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[ "${NR_DEFINED_USERS}" -ne "${NR_COMBINED_USERS}" ] && {
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echo "Undefined users:"
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diff "${TMP_DEFINED}" "${TMP_COMBINED}" | grep "^>"
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cleanup
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return 1
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}
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sed 's@\(^:\)*:.*@\1@' "${ROOT_DIR}/etc/group" | sort | uniq > "${TMP_DEFINED}"
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grep -v "^#" "${CFGFILE}" | cut -s -d " " -f 3 > "${TMP_INTERMED}"
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cat "${TMP_DEFINED}" "${TMP_INTERMED}" | sort | uniq > "${TMP_COMBINED}"
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NR_DEFINED_GROUPS="$(wc -l < "${TMP_DEFINED}")"
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NR_COMBINED_GROUPS="$(wc -l < "${TMP_COMBINED}")"
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[ "${NR_DEFINED_GROUPS}" -ne "${NR_COMBINED_GROUPS}" ] && {
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echo "Undefined groups:"
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diff "${TMP_DEFINED}" "${TMP_COMBINED}" | grep "^>"
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cleanup
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return 1
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}
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# Add checks for required directories here
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cleanup
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return 0
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}
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apply_cfgfile() {
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CFGFILE="$1"
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SKIP_REQUIREMENTS="$2"
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[ "${VERBOSE}" != "no" ] && echo "Applying ${CFGFILE}"
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[ "${SKIP_REQUIREMENTS}" = "yes" ] || check_requirements "${CFGFILE}" || {
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echo "Skipping ${CFGFILE}"
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return 1
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}
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sed 's/#.*//' "${CFGFILE}" | \
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while read -r TTYPE TUSER TGROUP TMODE TNAME TLTARGET; do
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test -z "${TLTARGET}" && continue
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TNAME=${ROOT_DIR}${TNAME}
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[ "${VERBOSE}" != "no" ] && echo "Checking for -${TNAME}-."
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[ "${TTYPE}" = "l" ] && {
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TSOURCE="$TLTARGET"
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[ "${VERBOSE}" != "no" ] && echo "Creating link -${TNAME}- pointing to -${TSOURCE}-."
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link_file "${TSOURCE}" "${TNAME}"
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continue
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}
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[ "${TTYPE}" = "b" ] && {
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TSOURCE="$TLTARGET"
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[ "${VERBOSE}" != "no" ] && echo "Creating mount-bind -${TNAME}- from -${TSOURCE}-."
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mount --bind "${TSOURCE}" "${TNAME}"
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EXEC="
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mount --bind \"${TSOURCE}\" \"${TNAME}\""
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test "$VOLATILE_ENABLE_CACHE" = yes && echo "$EXEC" >> /etc/volatile.cache.build
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continue
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}
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[ -L "${TNAME}" ] && {
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[ "${VERBOSE}" != "no" ] && echo "Found link."
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NEWNAME=$(ls -l "${TNAME}" | sed -e 's/^.*-> \(.*\)$/\1/')
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if echo "${NEWNAME}" | grep -v "^/" >/dev/null; then
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TNAME="$(echo "${TNAME}" | sed -e 's@\(.*\)/.*@\1@')/${NEWNAME}"
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[ "${VERBOSE}" != "no" ] && echo "Converted relative linktarget to absolute path -${TNAME}-."
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else
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TNAME="${NEWNAME}"
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[ "${VERBOSE}" != "no" ] && echo "Using absolute link target -${TNAME}-."
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fi
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}
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case "${TTYPE}" in
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"f") [ "${VERBOSE}" != "no" ] && echo "Creating file -${TNAME}-."
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TSOURCE="$TLTARGET"
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[ "${TSOURCE}" = "none" ] && TSOURCE=""
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create_file "${TNAME}" "${TSOURCE}"
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;;
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"d") [ "${VERBOSE}" != "no" ] && echo "Creating directory -${TNAME}-."
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mk_dir "${TNAME}"
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# Add check to see if there's an entry in fstab to mount.
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;;
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*) [ "${VERBOSE}" != "no" ] && echo "Invalid type -${TTYPE}-."
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continue
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;;
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esac
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done
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return 0
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}
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clearcache=0
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exec 9</proc/cmdline
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while read -r line <&9
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do
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case "$line" in
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*clearcache*) clearcache=1
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;;
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*) continue
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;;
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esac
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done
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exec 9>&-
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if test -e "${ROOT_DIR}/etc/volatile.cache" -a "$VOLATILE_ENABLE_CACHE" = "yes" -a "x$1" != "xupdate" -a "x$clearcache" = "x0"
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then
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sh "${ROOT_DIR}/etc/volatile.cache"
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else
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rm -f "${ROOT_DIR}/etc/volatile.cache" "${ROOT_DIR}/etc/volatile.cache.build"
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# Apply the core file with out checking requirements. ${TMPROOT} is
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# needed by check_requirements but is setup by this file, so it must be
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# processed first and without being checked.
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[ -e "${CFGDIR}/${COREDEF}" ] && apply_cfgfile "${CFGDIR}/${COREDEF}" "yes"
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# Fast path: check_requirements is slow and most of the time doesn't
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# find any problems. If there are a lot of config files, it is much
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# faster to to concatenate them all together and process them once to
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# avoid the overhead of calling check_requirements repeatedly
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TMP_FILE="${TMPROOT}/tmp_volatile.$$"
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rm -f "$TMP_FILE"
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CFGFILES="$(ls -1 "${CFGDIR}" | grep -v "^${COREDEF}\$" | sort)"
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for file in ${CFGFILES}; do
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cat "${CFGDIR}/${file}" >> "$TMP_FILE"
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done
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if check_requirements "$TMP_FILE"
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then
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apply_cfgfile "$TMP_FILE" "yes"
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else
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# Slow path: One or more config files failed requirements.
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# Process each one individually so the offending one can be
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# skipped
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for file in ${CFGFILES}; do
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apply_cfgfile "${CFGDIR}/${file}"
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done
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fi
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rm "$TMP_FILE"
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[ -e "${ROOT_DIR}/etc/volatile.cache.build" ] && sync && mv "${ROOT_DIR}/etc/volatile.cache.build" "${ROOT_DIR}/etc/volatile.cache"
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fi
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if [ -z "${ROOT_DIR}" ] && [ -f /etc/ld.so.cache ] && [ ! -f /var/run/ld.so.cache ]
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then
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ln -s /etc/ld.so.cache /var/run/ld.so.cache
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fi
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