Make s3-sync usable with others than AWS S3

Author: back-2-95

misc/s3-sync/README.md

@@ -7,14 +7,22 @@ Container to sync backups to Amazon S3 and get them from there using s3cmd.
 - Mount local path `/abs/path/to/backups` to container in `/data`
 - Sync all files from local path to S3 bucket `foobar-bucket`
 
-```
+```console
 docker run -it -e ACCESS_KEY=foobar -e SECRET_KEY=foobar -e S3_PATH=s3://foobar-bucket \
     -v /abs/path/to/backups:/data druidfi/s3-sync sync
 ```
 
-## Run in cron mode
+## Use custom s3cmd configuration
 
+```console
+docker run -it -e S3_PATH=s3://foobar-bucket \
+    -v /abs/path/to/.s3cfg:/root/.s3cfg:ro \
+    -v /abs/path/to/backups:/data druidfi/s3-sync
 ```
+
+## Run in cron mode
+
+```console
 docker run -it -e ACCESS_KEY=foobar -e SECRET_KEY=foobar -e S3_PATH=s3://foobar-bucket -e CRON_SCHEDULE="*/5 * * * *" \
     -v /abs/path/to/backups:/data druidfi/s3-sync
 ```
@@ -24,9 +32,9 @@ docker run -it -e ACCESS_KEY=foobar -e SECRET_KEY=foobar -e S3_PATH=s3://foobar-
 - See the documentation in https://s3tools.org/usage
 - Sync specific documentation in https://s3tools.org/s3cmd-sync
 
-## How to give access to S3 bucket
+## How to give access to AWS S3 bucket
 
-```
+```json
 {
     "Version": "2008-10-17",
     "Statement": [
@@ -50,4 +58,4 @@ docker run -it -e ACCESS_KEY=foobar -e SECRET_KEY=foobar -e S3_PATH=s3://foobar-
         }
     ]
 }
-```
+```

misc/s3-sync/entrypoint.sh

@@ -2,14 +2,19 @@
 # shellcheck disable=SC2086
 
 DATA_PATH="/data/"
+S3CMD_BIN="/usr/bin/s3cmd"
 
-: "${ACCESS_KEY:?"ACCESS_KEY env variable is required"}"
-: "${SECRET_KEY:?"SECRET_KEY env variable is required"}"
-REGION=${REGION:-eu-central-1}
+if [ -n "${REGION}" ]; then
+  $S3CMD_BIN="${$S3CMD_BIN} --region=${REGION}"
+fi
+
+if [ -n "${ACCESS_KEY}" ]; then
+  $S3CMD_BIN="${$S3CMD_BIN} --access_key=${ACCESS_KEY}"
+fi
 
-S3CMD_BIN="/usr/bin/s3cmd --region=$REGION"
-S3CMD_BIN="$S3CMD_BIN --access_key=$ACCESS_KEY"
-S3CMD_BIN="$S3CMD_BIN --secret_key=$SECRET_KEY"
+if [ -n "${SECRET_KEY}" ]; then
+  $S3CMD_BIN="${$S3CMD_BIN} --secret_key=${SECRET_KEY}"
+fi
 
 if [ "$1" = 'conf' ]; then
     echo -e "\n\nsc3cmd:" "$S3CMD_BIN" "\n\n"