Add MariaDB healthcheck.sh script

The script can run many tests as well be used in the container
healthcheck instruction to check health status.

Signed-off-by: Alexandre Vicenzi <[email protected]>

src/bci_build/package/appcontainers.py

@@ -130,6 +130,20 @@
 ]
 
 _MARIADB_ENTRYPOINT = (Path(__file__).parent / "mariadb" / "entrypoint.sh").read_bytes()
+_MARIADB_HEALTHCHECK = (Path(__file__).parent / "mariadb" / "healthcheck.sh").read_bytes()
+_MARIADB_GOSU = b"""#!/usr/bin/env bash
+
+u=$1
+shift
+opts=$*
+
+if ! id -u $u > /dev/null 2>&1; then
+    echo "Invalid user: $u"
+    exit 1
+fi
+
+setpriv --reuid=$u --regid=$u --clear-groups -- /bin/bash $opts
+"""
 
 MARIADB_CONTAINERS = []
 MARIADB_CLIENT_CONTAINERS = []
@@ -163,6 +177,8 @@
             entrypoint=["docker-entrypoint.sh"],
             extra_files={
                 "docker-entrypoint.sh": _MARIADB_ENTRYPOINT,
+                "healthcheck.sh": _MARIADB_HEALTHCHECK,
+                "gosu": _MARIADB_GOSU,
                 "_constraints": generate_disk_size_constraints(11),
             },
             support_level=SupportLevel.L3,
@@ -177,7 +193,13 @@
 {DOCKERFILE_RUN} chmod 755 /usr/local/bin/docker-entrypoint.sh
 {DOCKERFILE_RUN} ln -s usr/local/bin/docker-entrypoint.sh / # backwards compat
 
-{DOCKERFILE_RUN} sed -i -e 's,exec gosu mysql ,exec setpriv --reuid=mysql --regid=mysql --clear-groups -- /bin/bash ,g' /usr/local/bin/docker-entrypoint.sh
+# healthcheck from https://github.com/MariaDB/mariadb-docker.git
+COPY healthcheck.sh /usr/local/bin/
+{DOCKERFILE_RUN} chmod 755 /usr/local/bin/healthcheck.sh
+
+COPY gosu /usr/local/bin/gosu
+{DOCKERFILE_RUN} chmod 755 /usr/local/bin/gosu
+
 {DOCKERFILE_RUN} sed -i -e 's,$(pwgen .*),$(openssl rand -base64 36),' /usr/local/bin/docker-entrypoint.sh
 
 # Ensure all logs goes to stdout

src/bci_build/package/mariadb/healthcheck.sh

@@ -0,0 +1,353 @@
+#!/bin/bash
+#
+# Healthcheck script for MariaDB
+#
+# Runs various tests on the MariaDB server to check its health. Pass the tests
+# to run as arguments. If all tests succeed, the server is considered healthy,
+# otherwise it's not.
+#
+# Arguments are processed in strict order. Set replication_* options before
+# the --replication option. This allows a different set of replication checks
+# on different connections.
+#
+# --su{=|-mysql} is option to run the healthcheck as a different unix user.
+# Useful if mysql@localhost user exists with unix socket authentication
+# Using this option disregards previous options set, so should usually be the
+# first option.
+#
+# Some tests require SQL privileges.
+#
+# TEST                      MINIMUM GRANTS REQUIRED
+# connect                   none*
+# innodb_initialized        USAGE
+# innodb_buffer_pool_loaded USAGE
+# galera_online             USAGE
+# galera_ready              USAGE
+# replication               REPLICATION_CLIENT (<10.5)or REPLICA MONITOR (10.5+)
+# mariadbupgrade            none, however unix user permissions on datadir
+#
+# The SQL user used is the default for the mysql client. This can be the unix user
+# if no user(or password) is set in the [mariadb-client] section of a configuration
+# file. --defaults-{file,extra-file,group-suffix} can specify a file/configuration
+# different from elsewhere.
+#
+# Note * though denied error message will result in error log without
+#      any permissions.
+
+set -eo pipefail
+
+_process_sql()
+{
+	mysql ${nodefaults:+--no-defaults} \
+		${def['file']:+--defaults-file=${def['file']}} \
+		${def['extra_file']:+--defaults-extra-file=${def['extra_file']}} \
+		${def['group_suffix']:+--defaults-group-suffix=${def['group_suffix']}} \
+		-B "$@"
+}
+
+# TESTS
+
+
+# CONNECT
+#
+# Tests that a connection can be made over TCP, the final state
+# of the entrypoint and is listening. The authentication used
+# isn't tested.
+connect()
+{
+	set +e +o pipefail
+	# (on second extra_file)
+	# shellcheck disable=SC2086
+	mysql ${nodefaults:+--no-defaults} \
+		${def['file']:+--defaults-file=${def['file']}} \
+		${def['extra_file']:+--defaults-extra-file=${def['extra_file']}}  \
+		${def['group_suffix']:+--defaults-group-suffix=${def['group_suffix']}}  \
+		-h localhost --protocol tcp -e 'select 1' 2>&1 \
+		| grep -qF "Can't connect"
+	local ret=${PIPESTATUS[1]}
+	set -eo pipefail
+	if (( "$ret" == 0 )); then
+		# grep Matched "Can't connect" so we fail
+		return 1
+	fi
+	return 0
+}
+
+# INNODB_INITIALIZED
+#
+# This tests that the crash recovery of InnoDB has completed
+# along with all the other things required to make it to a healthy
+# operational state. Note this may return true in the early
+# states of initialization. Use with a connect test to avoid
+# these false positives.
+innodb_initialized()
+{
+	local s
+	s=$(_process_sql --skip-column-names -e "select 1 from information_schema.ENGINES WHERE engine='innodb' AND support in ('YES', 'DEFAULT', 'ENABLED')")
+	[ "$s" == 1 ]
+}
+
+# INNODB_BUFFER_POOL_LOADED
+#
+# Tests the load of the innodb buffer pool as been complete
+# implies innodb_buffer_pool_load_at_startup=1 (default), or if
+# manually SET innodb_buffer_pool_load_now=1
+innodb_buffer_pool_loaded()
+{
+	local s
+	s=$(_process_sql --skip-column-names -e "select VARIABLE_VALUE from information_schema.GLOBAL_STATUS WHERE VARIABLE_NAME='Innodb_buffer_pool_load_status'")
+	if [[ $s =~ 'load completed' ]]; then
+		return 0
+	fi
+	return 1
+}
+
+# GALERA_ONLINE
+#
+# Tests that the galera node is in the SYNCed state
+galera_online()
+{
+	local s
+	s=$(_process_sql --skip-column-names -e "select VARIABLE_VALUE from information_schema.GLOBAL_STATUS WHERE VARIABLE_NAME='WSREP_LOCAL_STATE'")
+	# 4 from https://galeracluster.com/library/documentation/node-states.html#node-state-changes
+	# not https://xkcd.com/221/
+	if [[ $s -eq 4 ]]; then
+		return 0
+	fi
+	return 1
+}
+
+# GALERA_READY
+#
+# Tests that the Galera provider is ready.
+galera_ready()
+{
+	local s
+	s=$(_process_sql --skip-column-names -e "select VARIABLE_VALUE from information_schema.GLOBAL_STATUS WHERE VARIABLE_NAME='WSREP_READY'")
+	if [ "$s" = "ON" ]; then
+		return 0
+	fi
+	return 1
+}
+
+# REPLICATION
+#
+# Tests the replication has the required set of functions:
+# --replication_all -> Checks all replication sources
+# --replication_name=n -> sets the multisource connection name tested
+# --replication_io -> IO thread is running
+# --replication_sql -> SQL thread is running
+# --replication_seconds_behind_master=n -> less than or equal this seconds of delay
+# --replication_sql_remaining_delay=n -> less than or equal this seconds of remaining delay
+#  (ref: https://mariadb.com/kb/en/delayed-replication/)
+replication()
+{
+	# SHOW REPLICA available 10.5+
+	# https://github.com/koalaman/shellcheck/issues/2383
+	# shellcheck disable=SC2016,SC2026
+	_process_sql -e "SHOW ${repl['all']:+all} REPLICA${repl['all']:+S} ${repl['name']:+'${repl['name']}'} STATUS\G" | \
+		{
+		# required for trim of leading space.
+		shopt -s extglob
+		# Row header
+		read -t 5 -r
+		# read timeout
+		[ $? -gt 128 ] && return 1
+		while IFS=":" read -t 1 -r n v; do
+			# Trim leading space
+			n=${n##+([[:space:]])}
+			# Leading space on all values by the \G format needs to be trimmed.
+			v=${v:1}
+			case "$n" in
+				Slave_IO_Running)
+					if [ -n "${repl['io']}" ] && [ "$v" = 'No' ]; then
+						return 1
+					fi
+					;;
+				Slave_SQL_Running)
+					if [ -n "${repl['sql']}" ] && [ "$v" = 'No' ]; then
+						return 1
+					fi
+					;;
+				Seconds_Behind_Master)
+					# A NULL value is the IO thread not running:
+					if [ -n "${repl['seconds_behind_master']}" ] &&
+						{ [ "$v" = NULL ] ||
+							(( "${repl['seconds_behind_master']}" < "$v" )); }; then
+						return 1
+					fi
+					;;
+				SQL_Remaining_Delay)
+					# Unlike Seconds_Behind_Master, sql_remaining_delay will hit NULL
+					# once replication is caught up - https://mariadb.com/kb/en/delayed-replication/
+					if [ -n "${repl['sql_remaining_delay']}" ] &&
+						[ "$v" != NULL ] &&
+						(( "${repl['sql_remaining_delay']}" < "$v" )); then
+						return 1
+					fi
+					;;
+			esac
+		done
+		# read timeout
+		[ $? -gt 128 ] && return 1
+		return 0
+       }
+       # reachable in command not found(?)
+       # shellcheck disable=SC2317
+       return $?
+}
+
+# mariadbupgrade
+#
+# Test the lock on the file $datadir/mysql_upgrade_info
+# https://jira.mariadb.org/browse/MDEV-27068
+mariadbupgrade()
+{
+	local f="$datadir/mysql_upgrade_info"
+	if [ -r "$f" ]; then
+		flock --exclusive --nonblock -n 9 9<"$f"
+		return $?
+	fi
+	return 0
+}
+
+
+# MAIN
+
+if [ $# -eq 0 ]; then
+	echo "At least one argument required" >&2
+	exit 1
+fi
+
+#ENDOFSUBSTITUTIONS
+# Marks the end of mysql -> mariadb name changes in 10.6+
+# Global variables used by tests
+declare -A repl
+declare -A def
+nodefaults=
+datadir=/var/lib/mysql
+if [ -f $datadir/.my-healthcheck.cnf ]; then
+	def['extra_file']=$datadir/.my-healthcheck.cnf
+fi
+
+_repl_param_check()
+{
+	case "$1" in
+		seconds_behind_master) ;&
+		sql_remaining_delay)
+			if [ -z "${repl['io']}" ]; then
+				repl['io']=1
+				echo "Forcing --replication_io=1, $1 requires IO thread to be running" >&2
+			fi
+			;;
+		all)
+			if [ -n "${repl['name']}" ]; then
+				unset 'repl[name]'
+				echo "Option --replication_all incompatible with specified source --replication_name, clearing replication_name" >&2
+			fi
+			;;
+		name)
+			if [ -n "${repl['all']}" ]; then
+				unset 'repl[all]'
+				echo "Option --replication_name incompatible with --replication_all, clearing replication_all" >&2
+			fi
+			;;
+	esac
+}
+
+_test_exists() {
+    declare -F "$1" > /dev/null
+    return $?
+}
+
+while [ $# -gt 0 ]; do
+	case "$1" in
+		--su=*)
+			u="${1#*=}"
+			shift
+			exec gosu "${u}" "${BASH_SOURCE[0]}" "$@"
+			;;
+		--su)
+			shift
+			u=$1
+			shift
+			exec gosu "$u" "${BASH_SOURCE[0]}" "$@"
+			;;
+		--su-mysql)
+			shift
+			exec gosu mysql "${BASH_SOURCE[0]}" "$@"
+			;;
+		--replication_*=*)
+			# Change the n to what is between _ and = and make lower case
+			n=${1#*_}
+			n=${n%%=*}
+			n=${n,,*}
+			# v is after the =
+			v=${1#*=}
+			repl[$n]=$v
+			_repl_param_check "$n"
+			;;
+		--replication_*)
+			# Without =, look for a non --option next as the value,
+			# otherwise treat it as an "enable", just equate to 1.
+			# Clearing option is possible with "--replication_X="
+			n=${1#*_}
+			n=${n,,*}
+			if [ "${2:0:2}" == '--' ]; then
+				repl[$n]=1
+			else
+				repl[$n]=$2
+				shift
+			fi
+			_repl_param_check "$n"
+			;;
+		--datadir=*)
+			datadir=${1#*=}
+			;;
+		--datadir)
+			shift
+			datadir=${1}
+			;;
+		--no-defaults)
+			def=()
+			nodefaults=1
+			;;
+		--defaults-file=*|--defaults-extra-file=*|--defaults-group-suffix=*)
+			n=${1:11} # length --defaults-
+			n=${n%%=*}
+			n=${n//-/_}
+			# v is after the =
+			v=${1#*=}
+			def[$n]=$v
+			nodefaults=
+			;;
+		--defaults-file|--defaults-extra-file|--defaults-group-suffix)
+			n=${1:11} # length --defaults-
+			n=${n//-/_}
+			if [ "${2:0:2}" == '--' ]; then
+				def[$n]=""
+			else
+				def[$n]=$2
+				shift
+			fi
+			nodefaults=
+			;;
+		--*)
+			test=${1#--}
+			;;
+		*)
+			echo "Unknown healthcheck option $1" >&2
+			exit 1
+	esac
+	if [ -n "$test" ]; then
+		if ! _test_exists "$test" ; then
+			echo "healthcheck unknown option or test '$test'" >&2
+			exit 1
+		elif ! "$test"; then
+			echo "healthcheck $test failed" >&2
+			exit 1
+		fi
+		test=
+	fi
+	shift
+done