Add support for PGPASSFILE for clusters #30

Dockerfile-alpine

@@ -18,6 +18,7 @@ ENV POSTGRES_DB="**None**" \
     POSTGRES_USER_FILE="**None**" \
     POSTGRES_PASSWORD="**None**" \
     POSTGRES_PASSWORD_FILE="**None**" \
+    POSTGRES_PASSFILE_STORE="**None**" \
     POSTGRES_EXTRA_OPTS="-Z9" \
     SCHEDULE="@daily" \
     BACKUP_DIR="/backups" \

Dockerfile-debian

@@ -18,6 +18,7 @@ ENV POSTGRES_DB="**None**" \
     POSTGRES_USER_FILE="**None**" \
     POSTGRES_PASSWORD="**None**" \
     POSTGRES_PASSWORD_FILE="**None**" \
+    POSTGRES_PASSFILE_STORE="**None**" \
     POSTGRES_EXTRA_OPTS="-Z9" \
     SCHEDULE="@daily" \
     BACKUP_DIR="/backups" \

README.md

@@ -69,6 +69,7 @@ Most variables are the same as in the [official postgres image](https://hub.dock
 | POSTGRES_HOST | Postgres connection parameter; postgres host to connect to. Required. |
 | POSTGRES_PASSWORD | Postgres connection parameter; postgres password to connect with. Required. |
 | POSTGRES_PASSWORD_FILE | Alternative to POSTGRES_PASSWORD, for usage with docker secrets. |
+| POSTGRES_PASSFILE_STORE | Alternative to POSTGRES_PASSWORD in [passfile format](https://www.postgresql.org/docs/12/libpq-pgpass.html), for usage with postgres clusters. |
 | POSTGRES_PORT | Postgres connection parameter; postgres port to connect to. Defaults to `5432`. |
 | POSTGRES_USER | Postgres connection parameter; postgres user to connect with. Required. |
 | POSTGRES_USER_FILE | Alternative to POSTGRES_USER, for usage with docker secrets. |

backup.sh

@@ -22,8 +22,8 @@ if [ "${POSTGRES_USER}" = "**None**" -a "${POSTGRES_USER_FILE}" = "**None**" ];
   exit 1
 fi
 
-if [ "${POSTGRES_PASSWORD}" = "**None**" -a "${POSTGRES_PASSWORD_FILE}" = "**None**" ]; then
-  echo "You need to set the POSTGRES_PASSWORD or POSTGRES_PASSWORD_FILE environment variable or link to a container named POSTGRES."
+if [ "${POSTGRES_PASSWORD}" = "**None**" -a "${POSTGRES_PASSWORD_FILE}" = "**None**" -a "${POSTGRES_PASSFILE_STORE}" = "**None**" ]; then
+  echo "You need to set the POSTGRES_PASSWORD or POSTGRES_PASSWORD_FILE or POSTGRES_PASSFILE_STORE environment variable or link to a container named POSTGRES."
   exit 1
 fi
 
@@ -44,12 +44,14 @@ else
   echo "Missing POSTGRES_USER_FILE file."
   exit 1
 fi
-if [ "${POSTGRES_PASSWORD_FILE}" = "**None**" ]; then
+if [ "${POSTGRES_PASSWORD_FILE}" = "**None**" -a "${POSTGRES_PASSFILE_STORE}" = "**None**" ]; then
   export PGPASSWORD="${POSTGRES_PASSWORD}"
 elif [ -r "${POSTGRES_PASSWORD_FILE}" ]; then
   export PGPASSWORD=$(cat "${POSTGRES_PASSWORD_FILE}")
+elif [ -r "${POSTGRES_PASSFILE_STORE}" ]; then
+  export PGPASSFILE="${POSTGRES_PASSFILE_STORE}"
 else
-  echo "Missing POSTGRES_PASSWORD_FILE file."
+  echo "Missing POSTGRES_PASSWORD_FILE or POSTGRES_PASSFILE_STORE file."
   exit 1
 fi
 POSTGRES_HOST_OPTS="-h ${POSTGRES_HOST} -p ${POSTGRES_PORT} ${POSTGRES_EXTRA_OPTS}"