Add support to perform an initial backup on startup

README.md

@@ -51,6 +51,7 @@ services:
          #  - POSTGRES_PASSWORD_FILE=/run/secrets/db_password <-- alternative for POSTGRES_PASSWORD (to use with docker secrets)
             - POSTGRES_EXTRA_OPTS=-Z1 --schema=public --blobs
             - SCHEDULE=@daily
+            - BACKUP_ON_START=TRUE
             - BACKUP_KEEP_DAYS=7
             - BACKUP_KEEP_WEEKS=4
             - BACKUP_KEEP_MONTHS=6
@@ -75,6 +76,7 @@ Most variables are the same as in the [official postgres image](https://hub.dock
 |--|--|
 | BACKUP_DIR | Directory to save the backup at. Defaults to `/backups`. |
 | BACKUP_SUFFIX | Filename suffix to save the backup. Defaults to `.sql.gz`. |
+| BACKUP_ON_START | If set to `TRUE` performs an backup on each container start or restart. Defaults to `FALSE`. |
 | BACKUP_KEEP_DAYS | Number of daily backups to keep before removal. Defaults to `7`. |
 | BACKUP_KEEP_WEEKS | Number of weekly backups to keep before removal. Defaults to `4`. |
 | BACKUP_KEEP_MONTHS | Number of monthly backups to keep before removal. Defaults to `6`. |

alpine.Dockerfile

@@ -1,7 +1,7 @@
 ARG BASETAG=alpine
 FROM postgres:$BASETAG
 
-ARG GOCRONVER=v0.0.10
+ARG GOCRONVER=v0.0.11
 ARG TARGETOS
 ARG TARGETARCH
 RUN set -x \
@@ -21,6 +21,7 @@ ENV POSTGRES_DB="**None**" \
     POSTGRES_EXTRA_OPTS="-Z1" \
     POSTGRES_CLUSTER="FALSE" \
     SCHEDULE="@daily" \
+    BACKUP_ON_START="FALSE" \
     BACKUP_DIR="/backups" \
     BACKUP_SUFFIX=".sql.gz" \
     BACKUP_LATEST_TYPE="symlink" \
@@ -36,12 +37,12 @@ ENV POSTGRES_DB="**None**" \
     WEBHOOK_EXTRA_ARGS=""
 
 COPY hooks /hooks
-COPY backup.sh /backup.sh
+COPY backup.sh env.sh init.sh /
 
 VOLUME /backups
 
-ENTRYPOINT ["/bin/sh", "-c"]
-CMD ["exec /usr/local/bin/go-cron -s \"$SCHEDULE\" -p \"$HEALTHCHECK_PORT\" -- /backup.sh"]
+ENTRYPOINT []
+CMD ["/init.sh"]
 
 HEALTHCHECK --interval=5m --timeout=3s \
   CMD curl -f "http://localhost:$HEALTHCHECK_PORT/" || exit 1

backup.sh

@@ -9,64 +9,7 @@ if [ -d "${HOOKS_DIR}" ]; then
   trap 'on_error' ERR
 fi
 
-if [ "${POSTGRES_DB}" = "**None**" -a "${POSTGRES_DB_FILE}" = "**None**" ]; then
-  echo "You need to set the POSTGRES_DB or POSTGRES_DB_FILE environment variable."
-  exit 1
-fi
-
-if [ "${POSTGRES_HOST}" = "**None**" ]; then
-  if [ -n "${POSTGRES_PORT_5432_TCP_ADDR}" ]; then
-    POSTGRES_HOST=${POSTGRES_PORT_5432_TCP_ADDR}
-    POSTGRES_PORT=${POSTGRES_PORT_5432_TCP_PORT}
-  else
-    echo "You need to set the POSTGRES_HOST environment variable."
-    exit 1
-  fi
-fi
-
-if [ "${POSTGRES_USER}" = "**None**" -a "${POSTGRES_USER_FILE}" = "**None**" ]; then
-  echo "You need to set the POSTGRES_USER or POSTGRES_USER_FILE environment variable."
-  exit 1
-fi
-
-if [ "${POSTGRES_PASSWORD}" = "**None**" -a "${POSTGRES_PASSWORD_FILE}" = "**None**" -a "${POSTGRES_PASSFILE_STORE}" = "**None**" ]; then
-  echo "You need to set the POSTGRES_PASSWORD or POSTGRES_PASSWORD_FILE or POSTGRES_PASSFILE_STORE environment variable or link to a container named POSTGRES."
-  exit 1
-fi
-
-#Process vars
-if [ "${POSTGRES_DB_FILE}" = "**None**" ]; then
-  POSTGRES_DBS=$(echo "${POSTGRES_DB}" | tr , " ")
-elif [ -r "${POSTGRES_DB_FILE}" ]; then
-  POSTGRES_DBS=$(cat "${POSTGRES_DB_FILE}")
-else
-  echo "Missing POSTGRES_DB_FILE file."
-  exit 1
-fi
-if [ "${POSTGRES_USER_FILE}" = "**None**" ]; then
-  export PGUSER="${POSTGRES_USER}"
-elif [ -r "${POSTGRES_USER_FILE}" ]; then
-  export PGUSER=$(cat "${POSTGRES_USER_FILE}")
-else
-  echo "Missing POSTGRES_USER_FILE file."
-  exit 1
-fi
-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 or POSTGRES_PASSFILE_STORE file."
-  exit 1
-fi
-export PGHOST="${POSTGRES_HOST}"
-export PGPORT="${POSTGRES_PORT}"
-KEEP_MINS=${BACKUP_KEEP_MINS}
-KEEP_DAYS=${BACKUP_KEEP_DAYS}
-KEEP_WEEKS=`expr $(((${BACKUP_KEEP_WEEKS} * 7) + 1))`
-KEEP_MONTHS=`expr $(((${BACKUP_KEEP_MONTHS} * 31) + 1))`
+source "$(dirname "$0")/env.sh"
 
 # Pre-backup hook
 if [ -d "${HOOKS_DIR}" ]; then

debian.Dockerfile

@@ -1,7 +1,7 @@
 ARG BASETAG=latest
 FROM postgres:$BASETAG
 
-ARG GOCRONVER=v0.0.10
+ARG GOCRONVER=v0.0.11
 ARG TARGETOS
 ARG TARGETARCH
 
@@ -35,6 +35,7 @@ ENV POSTGRES_DB="**None**" \
     POSTGRES_EXTRA_OPTS="-Z1" \
     POSTGRES_CLUSTER="FALSE" \
     SCHEDULE="@daily" \
+    BACKUP_ON_START="FALSE" \
     BACKUP_DIR="/backups" \
     BACKUP_SUFFIX=".sql.gz" \
     BACKUP_LATEST_TYPE="symlink" \
@@ -50,12 +51,12 @@ ENV POSTGRES_DB="**None**" \
     WEBHOOK_EXTRA_ARGS=""
 
 COPY hooks /hooks
-COPY backup.sh /backup.sh
+COPY backup.sh env.sh init.sh /
 
 VOLUME /backups
 
-ENTRYPOINT ["/bin/sh", "-c"]
-CMD ["exec /usr/local/bin/go-cron -s \"$SCHEDULE\" -p \"$HEALTHCHECK_PORT\" -- /backup.sh"]
+ENTRYPOINT []
+CMD ["/init.sh"]
 
 HEALTHCHECK --interval=5m --timeout=3s \
   CMD curl -f "http://localhost:$HEALTHCHECK_PORT/" || exit 1

docker-bake.hcl

@@ -15,12 +15,12 @@ variable "BUILD_REVISION" {
 }
 
 target "debian" {
-	args = {"GOCRONVER" = "v0.0.10"}
+	args = {"GOCRONVER" = "v0.0.11"}
 	dockerfile = "debian.Dockerfile"
 }
 
 target "alpine" {
-	args = {"GOCRONVER" = "v0.0.10"}
+	args = {"GOCRONVER" = "v0.0.11"}
 	dockerfile = "alpine.Dockerfile"
 }
 

env.sh

@@ -0,0 +1,66 @@
+#!/usr/bin/env bash
+# Pre-validate the environment
+if [ "${POSTGRES_DB}" = "**None**" -a "${POSTGRES_DB_FILE}" = "**None**" ]; then
+  echo "You need to set the POSTGRES_DB or POSTGRES_DB_FILE environment variable."
+  exit 1
+fi
+
+if [ "${POSTGRES_HOST}" = "**None**" ]; then
+  if [ -n "${POSTGRES_PORT_5432_TCP_ADDR}" ]; then
+    POSTGRES_HOST=${POSTGRES_PORT_5432_TCP_ADDR}
+    POSTGRES_PORT=${POSTGRES_PORT_5432_TCP_PORT}
+  else
+    echo "You need to set the POSTGRES_HOST environment variable."
+    exit 1
+  fi
+fi
+
+if [ "${POSTGRES_USER}" = "**None**" -a "${POSTGRES_USER_FILE}" = "**None**" ]; then
+  echo "You need to set the POSTGRES_USER or POSTGRES_USER_FILE environment variable."
+  exit 1
+fi
+
+if [ "${POSTGRES_PASSWORD}" = "**None**" -a "${POSTGRES_PASSWORD_FILE}" = "**None**" -a "${POSTGRES_PASSFILE_STORE}" = "**None**" ]; then
+  echo "You need to set the POSTGRES_PASSWORD or POSTGRES_PASSWORD_FILE or POSTGRES_PASSFILE_STORE environment variable or link to a container named POSTGRES."
+  exit 1
+fi
+
+#Process vars
+if [ "${POSTGRES_DB_FILE}" = "**None**" ]; then
+  POSTGRES_DBS=$(echo "${POSTGRES_DB}" | tr , " ")
+elif [ -r "${POSTGRES_DB_FILE}" ]; then
+  POSTGRES_DBS=$(cat "${POSTGRES_DB_FILE}")
+else
+  echo "Missing POSTGRES_DB_FILE file."
+  exit 1
+fi
+if [ "${POSTGRES_USER_FILE}" = "**None**" ]; then
+  export PGUSER="${POSTGRES_USER}"
+elif [ -r "${POSTGRES_USER_FILE}" ]; then
+  export PGUSER=$(cat "${POSTGRES_USER_FILE}")
+else
+  echo "Missing POSTGRES_USER_FILE file."
+  exit 1
+fi
+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 or POSTGRES_PASSFILE_STORE file."
+  exit 1
+fi
+export PGHOST="${POSTGRES_HOST}"
+export PGPORT="${POSTGRES_PORT}"
+KEEP_MINS=${BACKUP_KEEP_MINS}
+KEEP_DAYS=${BACKUP_KEEP_DAYS}
+KEEP_WEEKS=`expr $(((${BACKUP_KEEP_WEEKS} * 7) + 1))`
+KEEP_MONTHS=`expr $(((${BACKUP_KEEP_MONTHS} * 31) + 1))`
+
+# Validate backup dir
+if [ '!' -d "${BACKUP_DIR}" -o '!' -w "${BACKUP_DIR}" -o '!' -x "${BACKUP_DIR}" ]; then
+  echo "BACKUP_DIR points to a file or folder with insufficient permissions."
+  exit 1
+fi

generate-docker-bake.sh

@@ -2,7 +2,7 @@
 
 set -e
 
-GOCRONVER="v0.0.10"
+GOCRONVER="v0.0.11"
 MAIN_TAG="16"
 TAGS_EXTRA="15 14 13 12"
 PLATFORMS="linux/amd64 linux/arm64 linux/arm/v7 linux/s390x linux/ppc64le"

init.sh

@@ -0,0 +1,13 @@
+#!/usr/bin/env bash
+set -Eeo pipefail
+
+# Prevalidate configuration (don't source)
+/env.sh
+
+EXTRA_ARGS=""
+# Initial background backup
+if [ "${BACKUP_ON_START}" = "TRUE" ]; then
+  EXTRA_ARGS="-i"
+fi
+
+exec /usr/local/bin/go-cron -s "$SCHEDULE" -p "$HEALTHCHECK_PORT" $EXTRA_ARGS -- /backup.sh