sh/tmpfiles: tmpfiles.d support.

This is the baseline support for tmpfiles.d.

Still missing:
- SELinux relabel, pending upstream clarification
- LIBDIR vs multilib systems, pending upstream clarification
- Whitespace in paths?
- Clean support not implemented
- "x" exclude type not implemented

X-Gentoo-Bug: 396003
X-Gentoo-Bug-URL: https://bugs.gentoo.org/show_bug.cgi?id=396003
Signed-off-by: Robin H. Johnson <robbat2@gentoo.org>

3 files changed, 289 insertions, 2 deletions

diff --git a/sh/.gitignore b/sh/.gitignore
index f67b992..3f6ef3f 100644
--- a/sh/.gitignore
+++ b/sh/.gitignore
@@ -9,3 +9,4 @@ init-early.sh
 ifwatchd-carrier.sh
 ifwatchd-nocarrier.sh
 udhcpc-hook.sh
+tmpfiles.sh
diff --git a/sh/Makefile b/sh/Makefile
index 15b24d0..4df8fde 100644
--- a/sh/Makefile
+++ b/sh/Makefile
@@ -1,8 +1,8 @@
 DIR=	${LIBEXECDIR}/sh
 SRCS=	init.sh.in functions.sh.in gendepends.sh.in init-common-post.sh.in \
-	rc-functions.sh.in runscript.sh.in ${SRCS-${OS}}
+	rc-functions.sh.in runscript.sh.in tmpfiles.sh.in ${SRCS-${OS}}
 INC=	init-common-post.sh rc-mount.sh functions.sh rc-functions.sh
-BIN=	gendepends.sh init.sh runscript.sh ${BIN-${OS}}
+BIN=	gendepends.sh init.sh runscript.sh tmpfiles.sh ${BIN-${OS}}
 
 INSTALLAFTER=	_installafter
 
diff --git a/sh/tmpfiles.sh.in b/sh/tmpfiles.sh.in
new file mode 100755
index 0000000..9c73897
--- /dev/null
+++ b/sh/tmpfiles.sh.in
@@ -0,0 +1,286 @@
+#!/bin/sh
+# This is a reimplementation of the systemd tmpfiles.d code
+# Control creation, deletion, and cleaning of volatile and temporary files
+#
+# Copyright (c) 2012 Gentoo Foundation
+#
+# This instance based on the Arch Linux version:
+# http://projects.archlinux.org/initscripts.git/tree/arch-tmpfiles
+# As of 2012/01/01
+#
+# See the tmpfiles.d manpage as well:
+# http://0pointer.de/public/systemd-man/tmpfiles.d.html
+# This script should match the manpage as of 2012/03/12
+#
+
+warninvalid() {
+	printf "tmpfiles: ignoring invalid entry on line %d of \`%s'\n" "$LINENUM" "$FILE"
+	error=$(( error+1 ))
+} >&2
+
+relabel() {
+	local paths=$1 mode=$2 uid=$3 gid=$4
+
+	for path in ${paths}; do
+		if [ -e $path ]; then
+			[ $uid != '-' ] && chown $CHOPTS "$uid" "$path"
+			[ $gid != '-' ] && chgrp $CHOPTS "$gid" "$path"
+			[ $mode != '-' ] && chmod $CHOPTS "$mode" "$path"
+			# TODO: SELinux relabel
+		fi
+	done
+}
+_b() {
+	# Create a block device node if it doesn't exist yet
+	local path=$1 mode=$2 uid=$3 gid=$4 age=$5 arg=$6
+	[ ! -e "$path" ] && mknod $path b ${arg%:*} ${arg#*:}
+}
+
+_c() {
+	# Create a character device node if it doesn't exist yet
+	local path=$1 mode=$2 uid=$3 gid=$4 age=$5 arg=$6
+	[ ! -e "$path" ] && mknod $path c ${arg%:*} ${arg#*:}
+}
+
+
+_f() {
+	# Create a file if it doesn't exist yet
+	local path=$1 mode=$2 uid=$3 gid=$4 age=$5 arg=$6
+
+	[ $CREATE -gt 0 ] || return 0
+
+	if [ ! -e $path ]; then
+		install -m"$mode" -o"$uid" -g"$gid" /dev/null "$path"
+		[ -n "$arg" ] && _w "$@"
+	fi
+}
+
+_F() {
+	# Create or truncate a file
+	local path=$1 mode=$2 uid=$3 gid=$4 age=$5 arg=$6
+
+	[ $CREATE -gt 0 ] || return 0
+
+	install -m"$mode" -o"$uid" -g"$gid" /dev/null "$path"
+	[ -n "$arg" ] && _w "$@"
+}
+
+_d() {
+	# Create a directory if it doesn't exist yet
+	local path=$1 mode=$2 uid=$3 gid=$4
+
+	[ $CREATE -gt 0 ] || return 0
+
+	if [ ! -d "$path" ]; then
+		install -d -m"$mode" -o"$uid" -g"$gid" "$path"
+	fi
+}
+
+_D() {
+	# Create or empty a directory
+	local path=$1 mode=$2 uid=$3 gid=$4
+
+	if [ -d $path ] && [ $REMOVE -gt 0 ]; then
+		find "$path" -mindepth 1 -maxdepth 1 -xdev -exec rm -rf {} +
+	fi
+
+	if [ $CREATE -gt 0 ]; then
+		install -d -m"$mode" -o"$uid" -g"$gid" "$path"
+	fi
+}
+
+_L() {
+	# Create a symlink if it doesn't exist yet
+	local path=$1 mode=$2 uid=$3 gid=$4 age=$5 arg=$6
+	[ ! -e "$path" ] && ln -s "$args" "$path"
+}
+
+_p() {
+	# Create a named pipe (FIFO) if it doesn't exist yet
+	local path=$1 mode=$2 uid=$3 gid=$4
+
+	[ $CREATE -gt 0 ] || return 0
+
+	if [ ! -p "$path" ]; then
+		mkfifo -m$mode "$path"
+		chown "$uid:$gid" "$path"
+	fi
+}
+
+_x() {
+	# Ignore a path during cleaning. Use this type to exclude paths from clean-up as
+	# controlled with the Age parameter. Note that lines of this type do not
+	# influence the effect of r or R lines. Lines of this type accept shell-style
+	# globs in place of of normal path names.
+	:
+	# XXX: we don't implement this
+}
+
+_r() {
+	# Remove a file or directory if it exists. This may not be used to remove
+	# non-empty directories, use R for that. Lines of this type accept shell-style
+	# globs in place of normal path names.
+	local path
+	local paths=$1
+
+	[ $REMOVE -gt 0 ] || return 0
+
+	for path in "${paths}"; do
+		if [ -f $path ]; then
+			rm -f "$path"
+		elif [ -d $path ]; then
+			rmdir "$path"
+		fi
+	done
+}
+
+_R() {
+	# Recursively remove a path and all its subdirectories (if it is a directory).
+	# Lines of this type accept shell-style globs in place of normal path names.
+	local path
+	local paths=$1
+
+	[ $REMOVE -gt 0 ] || return 0
+
+	for path in "${paths}"; do
+		[ -d $path ] && rm -rf --one-file-system "$path"
+	done
+}
+
+_w() {
+	# Write the argument parameter to a file, if it exists.
+	local path=$1 mode=$2 uid=$3 gid=$4 age=$5 arg=$6
+	[ -f "$path" ] && echo "$arg" >>"$path"
+}
+
+_z() {
+	# Set ownership, access mode and relabel security context of a file or
+	# directory if it exists. Lines of this type accept shell-style globs in
+	# place of normal path names.
+	[ $CREATE -gt 0 ] || return 0
+
+	relabel "$@"
+}
+
+_Z() {
+	# Recursively set ownership, access mode and relabel security context of a
+	# path and all its subdirectories (if it is a directory). Lines of this type
+	# accept shell-style globs in place of normal path names.
+	[ $CREATE -gt 0 ] || return 0
+
+	CHOPTS=-R relabel "$@"
+}
+
+CREATE=0 REMOVE=0 CLEAN=0 VERBOSE=0 DRYRUN=0 error=0 LINENO=0
+FILE=
+fragments=
+# TODO: The systemd spec explicitly says /usr/lib/, but it should probably be
+# OUTSIDE of lib entirely, or at the very least handle multilib systems better.
+tmpfiles_dirs='/usr/lib64/tmpfiles.d/ /usr/lib/tmpfiles.d/ /etc/tmpfiles.d/ /run/tmpfiles.d/'
+tmpfiles_basenames=''
+tmpfiles_d=''
+# Build a list of sorted unique basenames
+# directories declared later in the tmpfiles_d array will override earlier
+# directories, on a per file basename basis.
+# `/etc/tmpfiles.d/foo.conf' supersedes `/usr/lib/tmpfiles.d/foo.conf'.
+# `/run/tmpfiles/foo.conf' will always be read after `/etc/tmpfiles.d/bar.conf'
+for d in ${tmpfiles_dirs} ; do
+	[ -d $d ] && for f in ${d}/*.conf ; do
+		[ -f $f ] && tmpfiles_basenames="${tmpfiles_basenames}\n${f##*/}"
+	done # for f in ${d}
+done # for d in ${tmpfiles_dirs}
+tmpfiles_basenames="`printf "${tmpfiles_basenames}\n" | sort | uniq`"
+
+for b in $tmpfiles_basenames ; do
+	real_f=''
+	for d in $tmpfiles_dirs ; do
+		f=${d}/${b}
+		[ -f "${f}" ] && real_f=$f
+	done
+	[ -f "${real_f}" ] && tmpfiles_d="${tmpfiles_d} ${real_f}"
+done
+
+while [ $# -gt 0 ]; do
+	case $1 in
+		--create) CREATE=1 ;;
+		--remove) REMOVE=1 ;;
+		--clean) CLEAN=1 ;; # TODO: Not implemented
+		--verbose) VERBOSE=1 ;;
+		--dryrun|--dry-run) DRYRUN=1 ;;
+	esac
+	shift
+done
+
+if [ $(( CREATE + REMOVE )) -ne 1 ] ; then
+	printf 'usage: %s [--create] [--remove]\n' "${0##*/}"
+	exit 1
+fi
+
+error=0
+
+# loop through the gathered fragments, sorted globally by filename.
+# `/run/tmpfiles/foo.conf' will always be read after `/etc/tmpfiles.d/bar.conf'
+for FILE in $tmpfiles_d ; do
+	LINENUM=0
+
+	### FILE FORMAT ###
+	# XXX: We ignore the 'Age' parameter
+	# 1    2              3    4    5    6   7
+	# Cmd  Path           Mode UID  GID  Age Argument
+	# d    /run/user      0755 root root 10d -
+	# Mode, UID, GID, Age, Argument may be omitted!
+
+	# TODO: Sorry, we don't handle whitespace in paths.
+	while read line; do
+		LINENUM=$(( LINENUM+1 ))
+
+		# This will fix up whitespace and comment lines
+		# skip over comments and empty lines
+		set -- $line
+
+		if [ -z "$1" -o -z "$2" ]; then
+			continue
+		fi
+
+		# whine about invalid entries
+		case $1 in
+			f|F|w|d|D|p|L|c|b|x|r|R|z|Z) ;;
+			*) warninvalid ; continue ;;
+		esac
+
+		cmd=$1
+		path=$2
+
+		# fall back on defaults when parameters are passed as '-'
+		if [ "$3" = '-' -o "$3" = '' ]; then
+			case ${1} in
+				p|f|F) mode=0644 ;;
+				d|D) mode=0755 ;;
+				z|Z|x|r|R|L) ;;
+			esac
+		else
+			mode=$3
+		fi
+		uid=$4
+		gid=$5
+		age=$6
+		arg=$7
+
+		[ ${4} = '-' ] && uid=0
+		[ ${5} = '-' ] && gid=0
+		[ ${6} = '-' ] && age=0
+		[ ${7} = '-' ] && arg=''
+		set -- "$path" "$mode" "$uid" "$gid" "$age" "$arg"
+
+		[ "$VERBOSE" -eq "1" ] && echo _$cmd "$@"
+		if [ "${DRYRUN}" -eq "0" ]; then
+			_$cmd "$@"
+			rc=$?
+			[ $rc -ne 0 ] && error=$((error + 1))
+		fi
+	done <$FILE
+done
+
+exit $error
+
+# vim: set ts=2 sw=2 sts=2 noet ft=sh: