add convenient way to set GID and UID of postgres user and group via ENV variables

Author: wollsi

10/Dockerfile

@@ -11,11 +11,13 @@ RUN set -ex; \
 		rm -rf /var/lib/apt/lists/*; \
 	fi
 
+ENV GID 999
+ENV UID 999
 # explicitly set user/group IDs
 RUN set -eux; \
-	groupadd -r postgres --gid=999; \
+	groupadd -r postgres --gid=$GID; \
 # https://salsa.debian.org/postgresql/postgresql-common/blob/997d842ee744687d99a2b2d95c1083a2615c79e8/debian/postgresql-common.postinst#L32-35
-	useradd -r -g postgres --uid=999 --home-dir=/var/lib/postgresql --shell=/bin/bash postgres; \
+	useradd -r -g postgres --uid=$UID --home-dir=/var/lib/postgresql --shell=/bin/bash postgres; \
 # also create the postgres user's home directory with appropriate permissions
 # see https://github.com/docker-library/postgres/issues/274
 	mkdir -p /var/lib/postgresql; \

11/Dockerfile

@@ -11,11 +11,13 @@ RUN set -ex; \
 		rm -rf /var/lib/apt/lists/*; \
 	fi
 
+ENV GID 999
+ENV UID 999
 # explicitly set user/group IDs
 RUN set -eux; \
-	groupadd -r postgres --gid=999; \
+	groupadd -r postgres --gid=$GID; \
 # https://salsa.debian.org/postgresql/postgresql-common/blob/997d842ee744687d99a2b2d95c1083a2615c79e8/debian/postgresql-common.postinst#L32-35
-	useradd -r -g postgres --uid=999 --home-dir=/var/lib/postgresql --shell=/bin/bash postgres; \
+	useradd -r -g postgres --uid=$UID --home-dir=/var/lib/postgresql --shell=/bin/bash postgres; \
 # also create the postgres user's home directory with appropriate permissions
 # see https://github.com/docker-library/postgres/issues/274
 	mkdir -p /var/lib/postgresql; \

12/Dockerfile

@@ -11,11 +11,13 @@ RUN set -ex; \
 		rm -rf /var/lib/apt/lists/*; \
 	fi
 
+ENV GID 999
+ENV UID 999
 # explicitly set user/group IDs
 RUN set -eux; \
-	groupadd -r postgres --gid=999; \
+	groupadd -r postgres --gid=$GID; \
 # https://salsa.debian.org/postgresql/postgresql-common/blob/997d842ee744687d99a2b2d95c1083a2615c79e8/debian/postgresql-common.postinst#L32-35
-	useradd -r -g postgres --uid=999 --home-dir=/var/lib/postgresql --shell=/bin/bash postgres; \
+	useradd -r -g postgres --uid=$UID --home-dir=/var/lib/postgresql --shell=/bin/bash postgres; \
 # also create the postgres user's home directory with appropriate permissions
 # see https://github.com/docker-library/postgres/issues/274
 	mkdir -p /var/lib/postgresql; \

13/Dockerfile

@@ -11,11 +11,13 @@ RUN set -ex; \
 		rm -rf /var/lib/apt/lists/*; \
 	fi
 
+ENV GID 999
+ENV UID 999
 # explicitly set user/group IDs
 RUN set -eux; \
-	groupadd -r postgres --gid=999; \
+	groupadd -r postgres --gid=$GID; \
 # https://salsa.debian.org/postgresql/postgresql-common/blob/997d842ee744687d99a2b2d95c1083a2615c79e8/debian/postgresql-common.postinst#L32-35
-	useradd -r -g postgres --uid=999 --home-dir=/var/lib/postgresql --shell=/bin/bash postgres; \
+	useradd -r -g postgres --uid=$UID --home-dir=/var/lib/postgresql --shell=/bin/bash postgres; \
 # also create the postgres user's home directory with appropriate permissions
 # see https://github.com/docker-library/postgres/issues/274
 	mkdir -p /var/lib/postgresql; \

9.5/Dockerfile

@@ -11,11 +11,13 @@ RUN set -ex; \
 		rm -rf /var/lib/apt/lists/*; \
 	fi
 
+ENV GID 999
+ENV UID 999
 # explicitly set user/group IDs
 RUN set -eux; \
-	groupadd -r postgres --gid=999; \
+	groupadd -r postgres --gid=$GID; \
 # https://salsa.debian.org/postgresql/postgresql-common/blob/997d842ee744687d99a2b2d95c1083a2615c79e8/debian/postgresql-common.postinst#L32-35
-	useradd -r -g postgres --uid=999 --home-dir=/var/lib/postgresql --shell=/bin/bash postgres; \
+	useradd -r -g postgres --uid=$UID --home-dir=/var/lib/postgresql --shell=/bin/bash postgres; \
 # also create the postgres user's home directory with appropriate permissions
 # see https://github.com/docker-library/postgres/issues/274
 	mkdir -p /var/lib/postgresql; \

9.6/Dockerfile

@@ -11,11 +11,13 @@ RUN set -ex; \
 		rm -rf /var/lib/apt/lists/*; \
 	fi
 
+ENV GID 999
+ENV UID 999
 # explicitly set user/group IDs
 RUN set -eux; \
-	groupadd -r postgres --gid=999; \
+	groupadd -r postgres --gid=$GID; \
 # https://salsa.debian.org/postgresql/postgresql-common/blob/997d842ee744687d99a2b2d95c1083a2615c79e8/debian/postgresql-common.postinst#L32-35
-	useradd -r -g postgres --uid=999 --home-dir=/var/lib/postgresql --shell=/bin/bash postgres; \
+	useradd -r -g postgres --uid=$UID --home-dir=/var/lib/postgresql --shell=/bin/bash postgres; \
 # also create the postgres user's home directory with appropriate permissions
 # see https://github.com/docker-library/postgres/issues/274
 	mkdir -p /var/lib/postgresql; \

Dockerfile-debian.template

@@ -10,12 +10,14 @@ RUN set -ex; \
 		; \
 		rm -rf /var/lib/apt/lists/*; \
 	fi
-
+	
+ENV GID 999
+ENV UID 999
 # explicitly set user/group IDs
 RUN set -eux; \
-	groupadd -r postgres --gid=999; \
+	groupadd -r postgres --gid=$GID; \
 # https://salsa.debian.org/postgresql/postgresql-common/blob/997d842ee744687d99a2b2d95c1083a2615c79e8/debian/postgresql-common.postinst#L32-35
-	useradd -r -g postgres --uid=999 --home-dir=/var/lib/postgresql --shell=/bin/bash postgres; \
+	useradd -r -g postgres --uid=$UID --home-dir=/var/lib/postgresql --shell=/bin/bash postgres; \
 # also create the postgres user's home directory with appropriate permissions
 # see https://github.com/docker-library/postgres/issues/274
 	mkdir -p /var/lib/postgresql; \