Initial commit

.gitignore

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+# If you prefer the allow list template instead of the deny list, see community template:
+# https://github.com/github/gitignore/blob/main/community/Golang/Go.AllowList.gitignore
+#
+# Binaries for programs and plugins
+*.exe
+*.exe~
+*.dll
+*.so
+*.dylib
+
+# Test binary, built with `go test -c`
+*.test
+
+# Output of the go coverage tool, specifically when used with LiteIDE
+*.out
+
+# Dependency directories (remove the comment below to include it)
+# vendor/
+
+# Go workspace file
+go.work
+
+# Other
+.DS_Store
+rclone-permissions-mapper
+build

LICENSE

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+MIT License
+
+Copyright (c) 2023 nielash
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

Makefile

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+SHELL = bash
+VERSION := 1.0
+
+compile_all:
+	go run bin/cross-compile.go -compile-only $(VERSION)

README.md

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+# Rclone Permissions Mapper
+
+Tool to convert `uid` and `gid` between mac and linux defaults when syncing files via cloud storage using [rclone](https://github.com/rclone/rclone) [`sync`](https://rclone.org/commands/rclone_sync/).
+
+## Usage
+```bash
+rclone sync source:path dest:path --metadata-mapper /path/to/rclone-permissions-mapper
+```
+
+or, to see input and output:
+```bash
+rclone sync source:path dest:path --metadata-mapper /path/to/rclone-permissions-mapper -v --dump mapper
+```
+
+## Background
+The default UID of the first regular user on macOS is `501`. On Linux, it is usually `1000`. If you [`rclone sync`](https://rclone.org/commands/rclone_sync/) a file created on one to the other (by way of a cloud storage remote) and use the [`--metadata`](https://rclone.org/docs/#m-metadata) flag (without using `sudo`), by default you will probably get an error like this one:
+
+```text
+ERROR : file.txt: Failed to copy: failed to set metadata: failed to change ownership: chown /testing/file.txt.fekayen6.partial: operation not permitted
+```
+
+This is because it is trying to `chown 1000:1000 /testing/file.txt` when actually it should be `501:20` (or vice versa.)
+
+This tool uses rclone's new `--metadata-mapper` feature to automatically detect and correct this during the sync. It does so by simply omitting the `uid` and `gid` (when necessary) in the metadata blob it passes back to rclone, so that the default values are kept.
+
+## Installation
+[Download](https://github.com/nielash/rclone-permissions-mapper/releases) and unzip (or build from source with `go build`), and then move the executable to your `$PATH`:
+```bash
+sudo rclone moveto /Users/yourusername/Downloads/rclone-permissions-mapper-1.0-osx-arm64/rclone-permissions-mapper /usr/local/bin/rclone-permissions-mapper -v
+```
+
+Test if it's working:
+
+```bash
+echo '{"Metadata": {"hello": "world"}}' | rclone-permissions-mapper
+```
+should output: `{"Metadata":{"hello":"world"}}`
+
+You can test what it will do by giving it different `uid` and `gid` values:
+``` bash
+echo '{"Metadata":{"gid":"20","uid":"501"}}' | rclone-permissions-mapper
+// on mac: {"Metadata":{"gid":"20","uid":"501"}}
+// on linux: {"Metadata":{}}
+
+echo '{"Metadata":{"gid":"1000","uid":"1000"}}' | rclone-permissions-mapper
+// on mac: {"Metadata":{}}
+// on linux: {"Metadata":{"gid":"20","uid":"501"}}
+```
+
+## Resources
+* [`--metadata-mapper` docs](https://rclone.org/docs/#metadata-mapper)
+* [rclone's handling of `uid` and `gid`](https://github.com/rclone/rclone/blob/c69eb84573c85206ab028eda2987180e049ef2e4/backend/local/metadata.go#L113-L128)
+* [Downloads](https://github.com/nielash/rclone-permissions-mapper/releases)
+* [Rclone Forum](https://forum.rclone.org/)