initial commit

sh/rc-mount.sh

@@ -0,0 +1,87 @@
+# Copyright (c) 2007-2015 The OpenRC Authors.
+# See the Authors file at the top-level directory of this distribution and
+# https://github.com/OpenRC/openrc/blob/master/AUTHORS
+#
+# This file is part of OpenRC. It is subject to the license terms in
+# the LICENSE file found in the top-level directory of this
+# distribution and at https://github.com/OpenRC/openrc/blob/master/LICENSE
+# This file may not be copied, modified, propagated, or distributed
+#    except according to the terms contained in the LICENSE file.
+
+# Declare this here so that no formatting doesn't affect the embedded newline
+__IFS="
+"
+
+# Handy function to handle all our unmounting needs
+# mountinfo is a C program to actually find our mounts on our supported OS's
+# We rely on fuser being present, so if it's not then don't unmount anything.
+# This isn't a real issue for the BSD's, but it is for Linux.
+do_unmount()
+{
+	local cmd="$1" retval=0 retry= pids=-
+	local f_opts="-m -c" f_kill="-s " mnt=
+	if [ "$RC_UNAME" = "Linux" ]; then
+		f_opts="-m"
+		f_kill="-"
+	fi
+
+	shift
+	local IFS="$__IFS"
+	set -- $(mountinfo "$@")
+	unset IFS
+	for mnt; do
+		# Unmounting a shared mount can unmount other mounts, so
+		# we need to check the mount is still valid
+		mountinfo --quiet "$mnt" || continue
+		# Ensure we interpret all characters properly.
+		mnt=$(printf "$mnt")
+
+		case "$cmd" in
+			umount)
+				ebegin "Unmounting $mnt"
+				;;
+			*)
+				ebegin "Remounting $mnt read only"
+				;;
+		esac
+
+		retry=4 # Effectively TERM, sleep 1, TERM, sleep 1, KILL, sleep 1
+		while ! LC_ALL=C $cmd "$mnt" 2>/dev/null; do
+			if command -v fuser >/dev/null 2>&1; then
+				pids="$(timeout -k 10 -s KILL "${rc_fuser_timeout:-60}" \
+					fuser $f_opts "$mnt" 2>/dev/null)"
+			fi
+			case " $pids " in
+				*" $$ "*)
+					eend 1 "failed because we are using" \
+					"$mnt"
+					retry=0;;
+				" - ")
+					eend 1
+					retry=0;;
+				"  ")
+					eend 1 "in use but fuser finds nothing"
+					retry=0;;
+				*)
+					if [ $retry -le 0 ]; then
+						eend 1
+					else
+						local sig="TERM"
+						: $(( retry -= 1 ))
+						[ $retry = 1 ] && sig="KILL"
+						fuser $f_kill$sig -k $f_opts \
+							"$mnt" >/dev/null 2>&1
+						sleep 1
+					fi
+					;;
+			esac
+			[ $retry -le 0 ] && break
+		done
+		if [ $retry -le 0 ]; then
+			retval=1
+		else
+			eend 0
+		fi
+	done
+	return $retval
+}