Allow arbitrary --user values

5.5/Dockerfile

@@ -3,6 +3,20 @@ FROM debian:jessie
 # add our user and group first to make sure their IDs get assigned consistently, regardless of whatever dependencies get added
 RUN groupadd -r mysql && useradd -r -g mysql mysql
 
+# add gosu for easy step-down from root
+ENV GOSU_VERSION 1.7
+RUN set -x \
+	&& apt-get update && apt-get install -y --no-install-recommends ca-certificates wget && rm -rf /var/lib/apt/lists/* \
+	&& wget -O /usr/local/bin/gosu "https://github.com/tianon/gosu/releases/download/$GOSU_VERSION/gosu-$(dpkg --print-architecture)" \
+	&& wget -O /usr/local/bin/gosu.asc "https://github.com/tianon/gosu/releases/download/$GOSU_VERSION/gosu-$(dpkg --print-architecture).asc" \
+	&& export GNUPGHOME="$(mktemp -d)" \
+	&& gpg --keyserver ha.pool.sks-keyservers.net --recv-keys B42F6819007F00F88E364FD4036A9C25BF357DD4 \
+	&& gpg --batch --verify /usr/local/bin/gosu.asc /usr/local/bin/gosu \
+	&& rm -r "$GNUPGHOME" /usr/local/bin/gosu.asc \
+	&& chmod +x /usr/local/bin/gosu \
+	&& gosu nobody true \
+	&& apt-get purge -y --auto-remove ca-certificates wget
+
 RUN mkdir /docker-entrypoint-initdb.d
 
 # FATAL ERROR: please install the following Perl modules before executing /usr/local/mysql/scripts/mysql_install_db:
@@ -19,10 +33,10 @@ ENV MYSQL_MAJOR 5.5
 ENV MYSQL_VERSION 5.5.49
 
 # note: we're pulling the *.asc file from mysql.he.net instead of dev.mysql.com because the official mirror 404s that file for whatever reason - maybe it's at a different path?
-RUN apt-get update && apt-get install -y curl --no-install-recommends && rm -rf /var/lib/apt/lists/* \
-	&& curl -SL "http://dev.mysql.com/get/Downloads/MySQL-$MYSQL_MAJOR/mysql-$MYSQL_VERSION-linux2.6-x86_64.tar.gz" -o mysql.tar.gz \
-	&& curl -SL "http://mysql.he.net/Downloads/MySQL-$MYSQL_MAJOR/mysql-$MYSQL_VERSION-linux2.6-x86_64.tar.gz.asc" -o mysql.tar.gz.asc \
-	&& apt-get purge -y --auto-remove curl \
+RUN apt-get update && apt-get install -y wget --no-install-recommends && rm -rf /var/lib/apt/lists/* \
+	&& wget "http://dev.mysql.com/get/Downloads/MySQL-$MYSQL_MAJOR/mysql-$MYSQL_VERSION-linux2.6-x86_64.tar.gz" -O mysql.tar.gz \
+	&& wget "http://mysql.he.net/Downloads/MySQL-$MYSQL_MAJOR/mysql-$MYSQL_VERSION-linux2.6-x86_64.tar.gz.asc" -O mysql.tar.gz.asc \
+	&& apt-get purge -y --auto-remove wget \
 	&& export GNUPGHOME="$(mktemp -d)" \
 # gpg: key 5072E1F5: public key "MySQL Release Engineering <[email protected]>" imported
 	&& gpg --keyserver ha.pool.sks-keyservers.net --recv-keys A4A9406876FCBD3C456770C88C718D3B5072E1F5 \
@@ -46,11 +60,15 @@ RUN mkdir -p /etc/mysql/conf.d \
 		echo '[mysqld]'; \
 		echo 'skip-host-cache'; \
 		echo 'skip-name-resolve'; \
-		echo 'user = mysql'; \
 		echo 'datadir = /var/lib/mysql'; \
 		echo '!includedir /etc/mysql/conf.d/'; \
 	} > /etc/mysql/my.cnf
 
+RUN mkdir -p /var/lib/mysql /var/run/mysqld \
+	&& chown -R mysql:mysql /var/lib/mysql /var/run/mysqld \
+# ensure that /var/run/mysqld (used for socket and lock files) is writable regardless of the UID our mysqld instance ends up having at runtime
+	&& chmod 777 /var/run/mysqld
+
 VOLUME /var/lib/mysql
 
 COPY docker-entrypoint.sh /usr/local/bin/

5.5/docker-entrypoint.sh

@@ -17,9 +17,21 @@ for arg; do
 	esac
 done
 
+_datadir() {
+	"$@" --verbose --help --log-bin-index=`mktemp -u` 2>/dev/null | awk '$1 == "datadir" { print $2; exit }'
+}
+
+# allow the container to be started with `--user`
+if [ "$1" = 'mysqld' -a -z "$wantHelp" -a "$(id -u)" = '0' ]; then
+	DATADIR="$(_datadir "$@")"
+	mkdir -p "$DATADIR"
+	chown -R mysql:mysql "$DATADIR"
+	exec gosu mysql "$BASH_SOURCE" "$@"
+fi
+
 if [ "$1" = 'mysqld' -a -z "$wantHelp" ]; then
 	# Get config
-	DATADIR="$("$@" --verbose --help --log-bin-index=`mktemp -u` 2>/dev/null | awk '$1 == "datadir" { print $2; exit }')"
+	DATADIR="$(_datadir "$@")"
 
 	if [ ! -d "$DATADIR/mysql" ]; then
 		if [ -z "$MYSQL_ROOT_PASSWORD" -a -z "$MYSQL_ALLOW_EMPTY_PASSWORD" -a -z "$MYSQL_RANDOM_ROOT_PASSWORD" ]; then
@@ -29,10 +41,9 @@ if [ "$1" = 'mysqld' -a -z "$wantHelp" ]; then
 		fi
 
 		mkdir -p "$DATADIR"
-		chown -R mysql:mysql "$DATADIR"
 
 		echo 'Initializing database'
-		mysql_install_db --user=mysql --datadir="$DATADIR" --rpm --basedir=/usr/local/mysql
+		mysql_install_db --datadir="$DATADIR" --rpm --basedir=/usr/local/mysql
 		echo 'Database initialized'
 
 		"$@" --skip-networking --basedir=/usr/local/mysql &
@@ -117,8 +128,6 @@ if [ "$1" = 'mysqld' -a -z "$wantHelp" ]; then
 		echo 'MySQL init process done. Ready for start up.'
 		echo
 	fi
-
-	chown -R mysql:mysql "$DATADIR"
 fi
 
 exec "$@"

5.6/Dockerfile

@@ -3,6 +3,20 @@ FROM debian:jessie
 # add our user and group first to make sure their IDs get assigned consistently, regardless of whatever dependencies get added
 RUN groupadd -r mysql && useradd -r -g mysql mysql
 
+# add gosu for easy step-down from root
+ENV GOSU_VERSION 1.7
+RUN set -x \
+	&& apt-get update && apt-get install -y --no-install-recommends ca-certificates wget && rm -rf /var/lib/apt/lists/* \
+	&& wget -O /usr/local/bin/gosu "https://github.com/tianon/gosu/releases/download/$GOSU_VERSION/gosu-$(dpkg --print-architecture)" \
+	&& wget -O /usr/local/bin/gosu.asc "https://github.com/tianon/gosu/releases/download/$GOSU_VERSION/gosu-$(dpkg --print-architecture).asc" \
+	&& export GNUPGHOME="$(mktemp -d)" \
+	&& gpg --keyserver ha.pool.sks-keyservers.net --recv-keys B42F6819007F00F88E364FD4036A9C25BF357DD4 \
+	&& gpg --batch --verify /usr/local/bin/gosu.asc /usr/local/bin/gosu \
+	&& rm -r "$GNUPGHOME" /usr/local/bin/gosu.asc \
+	&& chmod +x /usr/local/bin/gosu \
+	&& gosu nobody true \
+	&& apt-get purge -y --auto-remove ca-certificates wget
+
 RUN mkdir /docker-entrypoint-initdb.d
 
 # FATAL ERROR: please install the following Perl modules before executing /usr/local/mysql/scripts/mysql_install_db:
@@ -29,7 +43,10 @@ RUN { \
 		echo mysql-community-server mysql-community-server/remove-test-db select false; \
 	} | debconf-set-selections \
 	&& apt-get update && apt-get install -y mysql-server="${MYSQL_VERSION}" && rm -rf /var/lib/apt/lists/* \
-	&& rm -rf /var/lib/mysql && mkdir -p /var/lib/mysql
+	&& rm -rf /var/lib/mysql && mkdir -p /var/lib/mysql /var/run/mysqld \
+	&& chown -R mysql:mysql /var/lib/mysql /var/run/mysqld \
+# ensure that /var/run/mysqld (used for socket and lock files) is writable regardless of the UID our mysqld instance ends up having at runtime
+	&& chmod 777 /var/run/mysqld
 
 # comment out a few problematic configuration values
 # don't reverse lookup hostnames, they are usually another container

5.6/docker-entrypoint.sh

@@ -17,9 +17,21 @@ for arg; do
 	esac
 done
 
+_datadir() {
+	"$@" --verbose --help --log-bin-index=`mktemp -u` 2>/dev/null | awk '$1 == "datadir" { print $2; exit }'
+}
+
+# allow the container to be started with `--user`
+if [ "$1" = 'mysqld' -a -z "$wantHelp" -a "$(id -u)" = '0' ]; then
+	DATADIR="$(_datadir "$@")"
+	mkdir -p "$DATADIR"
+	chown -R mysql:mysql "$DATADIR"
+	exec gosu mysql "$BASH_SOURCE" "$@"
+fi
+
 if [ "$1" = 'mysqld' -a -z "$wantHelp" ]; then
 	# Get config
-	DATADIR="$("$@" --verbose --help --log-bin-index=`mktemp -u` 2>/dev/null | awk '$1 == "datadir" { print $2; exit }')"
+	DATADIR="$(_datadir "$@")"
 
 	if [ ! -d "$DATADIR/mysql" ]; then
 		if [ -z "$MYSQL_ROOT_PASSWORD" -a -z "$MYSQL_ALLOW_EMPTY_PASSWORD" -a -z "$MYSQL_RANDOM_ROOT_PASSWORD" ]; then
@@ -29,10 +41,9 @@ if [ "$1" = 'mysqld' -a -z "$wantHelp" ]; then
 		fi
 
 		mkdir -p "$DATADIR"
-		chown -R mysql:mysql "$DATADIR"
 
 		echo 'Initializing database'
-		mysql_install_db --user=mysql --datadir="$DATADIR" --rpm --keep-my-cnf
+		mysql_install_db --datadir="$DATADIR" --rpm --keep-my-cnf
 		echo 'Database initialized'
 
 		"$@" --skip-networking &
@@ -117,8 +128,6 @@ if [ "$1" = 'mysqld' -a -z "$wantHelp" ]; then
 		echo 'MySQL init process done. Ready for start up.'
 		echo
 	fi
-
-	chown -R mysql:mysql "$DATADIR"
 fi
 
 exec "$@"

5.7/Dockerfile

@@ -3,6 +3,20 @@ FROM debian:jessie
 # add our user and group first to make sure their IDs get assigned consistently, regardless of whatever dependencies get added
 RUN groupadd -r mysql && useradd -r -g mysql mysql
 
+# add gosu for easy step-down from root
+ENV GOSU_VERSION 1.7
+RUN set -x \
+	&& apt-get update && apt-get install -y --no-install-recommends ca-certificates wget && rm -rf /var/lib/apt/lists/* \
+	&& wget -O /usr/local/bin/gosu "https://github.com/tianon/gosu/releases/download/$GOSU_VERSION/gosu-$(dpkg --print-architecture)" \
+	&& wget -O /usr/local/bin/gosu.asc "https://github.com/tianon/gosu/releases/download/$GOSU_VERSION/gosu-$(dpkg --print-architecture).asc" \
+	&& export GNUPGHOME="$(mktemp -d)" \
+	&& gpg --keyserver ha.pool.sks-keyservers.net --recv-keys B42F6819007F00F88E364FD4036A9C25BF357DD4 \
+	&& gpg --batch --verify /usr/local/bin/gosu.asc /usr/local/bin/gosu \
+	&& rm -r "$GNUPGHOME" /usr/local/bin/gosu.asc \
+	&& chmod +x /usr/local/bin/gosu \
+	&& gosu nobody true \
+	&& apt-get purge -y --auto-remove ca-certificates wget
+
 RUN mkdir /docker-entrypoint-initdb.d
 
 # FATAL ERROR: please install the following Perl modules before executing /usr/local/mysql/scripts/mysql_install_db:
@@ -29,7 +43,10 @@ RUN { \
 		echo mysql-community-server mysql-community-server/remove-test-db select false; \
 	} | debconf-set-selections \
 	&& apt-get update && apt-get install -y mysql-server="${MYSQL_VERSION}" && rm -rf /var/lib/apt/lists/* \
-	&& rm -rf /var/lib/mysql && mkdir -p /var/lib/mysql
+	&& rm -rf /var/lib/mysql && mkdir -p /var/lib/mysql /var/run/mysqld \
+	&& chown -R mysql:mysql /var/lib/mysql /var/run/mysqld \
+# ensure that /var/run/mysqld (used for socket and lock files) is writable regardless of the UID our mysqld instance ends up having at runtime
+	&& chmod 777 /var/run/mysqld
 
 # comment out a few problematic configuration values
 # don't reverse lookup hostnames, they are usually another container

5.7/docker-entrypoint.sh

@@ -17,9 +17,21 @@ for arg; do
 	esac
 done
 
+_datadir() {
+	"$@" --verbose --help 2>/dev/null | awk '$1 == "datadir" { print $2; exit }'
+}
+
+# allow the container to be started with `--user`
+if [ "$1" = 'mysqld' -a -z "$wantHelp" -a "$(id -u)" = '0' ]; then
+	DATADIR="$(_datadir "$@")"
+	mkdir -p "$DATADIR"
+	chown -R mysql:mysql "$DATADIR"
+	exec gosu mysql "$BASH_SOURCE" "$@"
+fi
+
 if [ "$1" = 'mysqld' -a -z "$wantHelp" ]; then
 	# Get config
-	DATADIR="$("$@" --verbose --help 2>/dev/null | awk '$1 == "datadir" { print $2; exit }')"
+	DATADIR="$(_datadir "$@")"
 
 	if [ ! -d "$DATADIR/mysql" ]; then
 		if [ -z "$MYSQL_ROOT_PASSWORD" -a -z "$MYSQL_ALLOW_EMPTY_PASSWORD" -a -z "$MYSQL_RANDOM_ROOT_PASSWORD" ]; then
@@ -29,7 +41,6 @@ if [ "$1" = 'mysqld' -a -z "$wantHelp" ]; then
 		fi
 
 		mkdir -p "$DATADIR"
-		chown -R mysql:mysql "$DATADIR"
 
 		echo 'Initializing database'
 		"$@" --initialize-insecure
@@ -117,8 +128,6 @@ if [ "$1" = 'mysqld' -a -z "$wantHelp" ]; then
 		echo 'MySQL init process done. Ready for start up.'
 		echo
 	fi
-
-	chown -R mysql:mysql "$DATADIR"
 fi
 
 exec "$@"