Add our own image of postgres for migrations

Postgres/13.4/linuxamd64.Dockerfile

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+FROM  postgres:13.4
+
+ENV PREVIOUS_VERSION 9.6
+RUN cp /etc/apt/sources.list.d/pgdg.list /etc/apt/sources.list.d/pgdg.list.backup && \
+    sed -i "s/$/ $PREVIOUS_VERSION/" /etc/apt/sources.list.d/pgdg.list && \
+    apt-get update && \
+    apt-get install -y --no-install-recommends \
+    postgresql-$PREVIOUS_VERSION \
+    postgresql-contrib-$PREVIOUS_VERSION && \
+    rm /etc/apt/sources.list.d/pgdg.list && mv /etc/apt/sources.list.d/pgdg.list.backup /etc/apt/sources.list.d/pgdg.list && \
+    rm -rf /var/lib/apt/lists/*
+
+COPY migrate-docker-entrypoint.sh /migrate-docker-entrypoint.sh
+
+ENTRYPOINT ["/migrate-docker-entrypoint.sh"]
+CMD ["postgres"]

Postgres/13.4/linuxarm32v7.Dockerfile

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+FROM --platform=arm  postgres:13.4
+
+# Postgres doesn't ship packages for 9.6
+ENV PREVIOUS_VERSION 9.6
+RUN FALLBACK="http://aois.blob.core.windows.net/public/$PREVIOUS_VERSION-$(uname -m).tar.gz" && \
+    FALLBACK_SHARE="http://aois.blob.core.windows.net/public/share-$PREVIOUS_VERSION-$(uname -m).tar.gz" && \
+    apt-get update && apt-get install  --no-install-recommends -y wget && \
+    rm -rf /var/lib/apt/lists/* && \
+    cd /usr/lib/postgresql && \
+    wget $FALLBACK && \
+    echo "50a98f90ad9c61d0b5b5ccb9c984ca48bd6e6f331ed17eb87086a2c4290c75c6 9.6-armv7l.tar.gz" | sha256sum -c - && \
+    tar -xvf *.tar.gz && \
+    rm -f *.tar.gz && \
+    cd /usr/share/postgresql && \
+    wget $FALLBACK_SHARE && \
+    echo "10c8c66d97fcb1cd9b22334118ba5afd495147c94f3a03409ca98da54643b433 share-9.6-armv7l.tar.gz" | sha256sum -c - && \
+    tar -xvf *.tar.gz && \
+    rm -f *.tar.gz
+
+COPY migrate-docker-entrypoint.sh /migrate-docker-entrypoint.sh
+
+ENTRYPOINT ["/migrate-docker-entrypoint.sh"]
+CMD ["postgres"]

Postgres/13.4/linuxarm64v8.Dockerfile

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+FROM --platform=arm64 postgres:13.4
+
+ENV PREVIOUS_VERSION 9.6
+RUN cp /etc/apt/sources.list.d/pgdg.list /etc/apt/sources.list.d/pgdg.list.backup && \
+    sed -i "s/$/ $PREVIOUS_VERSION/" /etc/apt/sources.list.d/pgdg.list && \
+    apt-get update && \
+    apt-get install -y --no-install-recommends \
+    postgresql-$PREVIOUS_VERSION \
+    postgresql-contrib-$PREVIOUS_VERSION && \
+    rm /etc/apt/sources.list.d/pgdg.list && mv /etc/apt/sources.list.d/pgdg.list.backup /etc/apt/sources.list.d/pgdg.list && \
+    rm -rf /var/lib/apt/lists/*
+
+COPY migrate-docker-entrypoint.sh /migrate-docker-entrypoint.sh
+
+ENTRYPOINT ["/migrate-docker-entrypoint.sh"]
+CMD ["postgres"]

Postgres/13.4/migrate-docker-entrypoint.sh

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+#!/usr/bin/env bash
+set -Eeo pipefail
+shopt -s extglob
+
+CURRENT_PGVERSION=""
+EXPECTED_PGVERSION="$PG_MAJOR"
+if [[ -f "/var/lib/postgresql/data/PG_VERSION" ]]; then
+    CURRENT_PGVERSION="$(cat /var/lib/postgresql/data/PG_VERSION)"
+fi
+
+if [[ "$CURRENT_PGVERSION" != "$EXPECTED_PGVERSION" ]] && \
+   [[ "$CURRENT_PGVERSION" != "" ]]; then
+
+    if ! [ -f "/usr/lib/postgresql/$CURRENT_PGVERSION/bin/pg_upgrade" ]; then
+        sed -i "s/$/ $CURRENT_PGVERSION/" /etc/apt/sources.list.d/pgdg.list
+        if ! apt-get update; then
+            echo "apt-get update failed. Are you using raspberry pi 4? If yes, please follow https://blog.samcater.com/fix-workaround-rpi4-docker-libseccomp2-docker-20/"
+            exit 1
+        fi
+        if ! apt-get install -y --no-install-recommends \
+                postgresql-$CURRENT_PGVERSION \
+                postgresql-contrib-$CURRENT_PGVERSION; then
+                # On arm32, postgres doesn't ship those packages, so we download
+                # the binaries from an archive we built from the postgres 9.6.20 image's binaries
+                FALLBACK="https://aois.blob.core.windows.net/public/$CURRENT_PGVERSION-$(uname -m).tar.gz"
+                FALLBACK_SHARE="https://aois.blob.core.windows.net/public/share-$CURRENT_PGVERSION-$(uname -m).tar.gz"
+                echo "Failure to install postgresql-$CURRENT_PGVERSION and postgresql-contrib-$CURRENT_PGVERSION trying fallback $FALLBACK"
+                apt-get install -y wget
+                pushd . > /dev/null
+                cd /usr/lib/postgresql
+                wget $FALLBACK
+                tar -xvf *.tar.gz
+                rm -f *.tar.gz
+                cd /usr/share/postgresql
+                wget $FALLBACK_SHARE
+                tar -xvf *.tar.gz
+                rm -f *.tar.gz
+                popd > /dev/null
+                echo "Successfully installed PG utilities via the fallback"
+        fi
+    else
+        echo "Migration binaries already present on the image"
+    fi
+
+    export PGBINOLD="/usr/lib/postgresql/$CURRENT_PGVERSION/bin"
+    export PGDATABASE="/var/lib/postgresql/data"
+    export PGDATAOLD="/var/lib/postgresql/data/$CURRENT_PGVERSION"
+    export PGDATANEW="/var/lib/postgresql/data/$EXPECTED_PGVERSION"
+
+    mkdir -p "$PGDATANEW" "$PGDATAOLD"
+    find "$PGDATABASE" -maxdepth 1 -mindepth 1 \
+                      -not -wholename "$PGDATAOLD" \
+                      -not -wholename "$PGDATANEW" \
+                      -exec mv {} "$PGDATAOLD/" \;
+    
+    chmod 700 "$PGDATAOLD" "$PGDATANEW"
+    chown postgres .
+	chown -R postgres "$PGDATAOLD" "$PGDATANEW" "$PGDATABASE"
+	if [ ! -s "$PGDATANEW/PG_VERSION" ]; then
+		PGDATA="$PGDATANEW" eval "gosu postgres initdb $POSTGRES_INITDB_ARGS"
+	fi
+
+    gosu postgres pg_upgrade
+    rm $PGDATANEW/*.conf
+    mv $PGDATANEW/* "$PGDATABASE"
+    mv $PGDATAOLD/*.conf "$PGDATABASE"
+    rm -r "$PGDATANEW"
+    ./delete_old_cluster.sh
+    rm ./analyze_new_cluster.sh
+fi
+
+if [ -f "docker-entrypoint.sh" ]; then
+    exec ./docker-entrypoint.sh  "$@"
+else
+    exec docker-entrypoint.sh  "$@"
+fi