From a68dc3771d285e426b98b79160da74aa915b0761 Mon Sep 17 00:00:00 2001
From: Jonathan Hawk <jhawk@mindgrub.com>
Date: Thu, 22 Aug 2024 14:27:25 -0400
Subject: [PATCH] feat: add REPLACE_SUBJECT and REPLACE_TARGET environment
 variables

---
 .github/workflows/release.yml |  4 +++-
 Dockerfile                    |  2 +-
 README.md                     | 13 ++++++++++++-
 run.sh                        |  6 +++++-
 4 files changed, 21 insertions(+), 4 deletions(-)

diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index a9d762c..6b58093 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -20,6 +20,7 @@ jobs:
           - "linux/amd64"
           - "linux/arm64"
         alpine_version:
+          - "3.20"
           - "3.19"
           - "3.18"
           - "3.17"
@@ -85,6 +86,7 @@ jobs:
       fail-fast: false
       matrix:
         alpine_version:
+          - "3.20"
           - "3.19"
           - "3.18"
           - "3.17"
@@ -113,7 +115,7 @@ jobs:
         with:
           images: ${{ env.REGISTRY_IMAGE }}
           tags: |
-            type=raw,value=latest,enabled=${{ matrix.alpine_version == '3.19' }}
+            type=raw,value=latest,enabled=${{ matrix.alpine_version == '3.20' }}
             type=raw,value=${{ env.IMAGE_VERSION }}-alpine-${{ matrix.alpine_version }}
             type=raw,value=${{ env.IMAGE_VERSION }}-alpine-${{ env.ALPINE_FULL_VERSION }}
 
diff --git a/Dockerfile b/Dockerfile
index 39d4a8c..fb9bf42 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-ARG ALPINE_VERSION=3.19
+ARG ALPINE_VERSION=3.20
 FROM alpine:${ALPINE_VERSION}
 
 RUN apk add --no-cache mysql-client python3 py3-pip coreutils jq aws-cli
diff --git a/README.md b/README.md
index fe91b0b..6c0ddcd 100644
--- a/README.md
+++ b/README.md
@@ -2,7 +2,16 @@
 
 An Alpine-based Docker image for producing a file with `mysqldump` and uploading it to Amazon S3.
 
-There are tags for Alpine 3.19, 3.18, and 3.17. Both `linux/amd64` and `linux/arm64`.
+There are tags for Alpine 3.20, 3.19, 3.18, and 3.17. This image is available on both the `linux/amd64` and `linux/arm64` platforms.
+
+```bash
+# The latest tag will always point to the most recent version of Alpine.
+docker pull @mindgrub/mysqldump-to-s3:latest
+docker pull @mindgrub/mysqldump-to-s3:1-alpine-3.20
+
+# Pull other versions or architectures.
+docker pull --platform linux/arm64 @mindgrub/mysqldump-to-s3:1-alpine-3.18
+```
 
 ## Environment Variables
 
@@ -18,6 +27,8 @@ There are tags for Alpine 3.19, 3.18, and 3.17. Both `linux/amd64` and `linux/ar
 - `MYSQLDUMP_OPTS` – Optional. Additional command line options to provide to `mysqldump`.
 - `REQUESTOR` – Optional. The email address of the user who requested this dump to be stored in the S3 metadata.
 - `SFN_TASK_TOKEN` – Optional. A Step Functions [Task Token](https://docs.aws.amazon.com/step-functions/latest/apireference/API_GetActivityTask.html#StepFunctions-GetActivityTask-response-taskToken). If present, this token will be used to call [`SendTaskHeartbeat`](https://docs.aws.amazon.com/step-functions/latest/apireference/API_SendTaskHeartbeat.html) and [`SendTaskSuccess`](https://docs.aws.amazon.com/step-functions/latest/apireference/API_SendTaskSuccess.html). The task output sent to `SendTaskSuccess` will consist of a JSON object with a single property: `uri` (containing the S3 URI of the database dump).
+- `REPLACE_SUBJECT` – Optional. A [Basic Regular Expression (BRE)](https://www.gnu.org/software/sed/manual/html_node/BRE-syntax.html) used to locate strings for replacement (e.g. DEFINER statements).
+- `REPLACE_TARGET` – Optional. Text that replaces all instances of the subject.
 - `MYSQL_NET_BUFFER_LENGTH` – _[Deprecated]_ Optional. The `net_buffer_length` setting for `mysqldump`.
 
 ### AWS Permissions
diff --git a/run.sh b/run.sh
index 1c5bcd6..920cb84 100755
--- a/run.sh
+++ b/run.sh
@@ -29,7 +29,11 @@ fi
 set -- "$@" "$DB_NAME"
 mysqldump_opts=$(printf ' %s' "$@")
 echo "About to export mysql://$DB_HOST/$DB_NAME to $destination"
-eval "mysqldump $mysqldump_opts" | gzip > "$destination"
+if [ -n "$REPLACE_SUBJECT" ] && [ -n "$REPLACE_TARGET" ]; then
+  eval "mysqldump $mysqldump_opts" | sed "s/$REPLACE_SUBJECT/$REPLACE_TARGET/g" | gzip > "$destination"
+else
+  eval "mysqldump $mysqldump_opts" | gzip > "$destination"
+fi
 echo "Export to $destination completed"
 
 # Send heartbeat