The fsync is a file transfer program capable of local update.

Usage:
  fsync [flags] SRC DEST

Flags:
  -d, --delete    delete extraneous files from dest dirs
  -h, --help      help for fsync
  -v, --verbose   increase verbosity

where

• SRC is a source (file or folder) to synchronize.
• DEST is a destination folder, where source file or folder should be placed.

There is a great tool named rsync, but it might be not available (for example, Windows doesn't have it). For sure, cwRsync can be installed and happy used. But I'd like to have owns (even if it is much humbler featured).

1. Validate SRC and DEST input arguments.
2. Check file in DEST folder:
   1. If file already exists - compare checksums of files and skip sync if equal.
   2. If file not exists:
      1. Copy SRC file to DEST temporary file.
      2. Compare checksums of files and fail if they differ.
      3. Rename DEST temporary file to DEST file.

go mod tidy
go mod vendor

To make a cross-build, please see available platforms:

go tool dist list

For example, for linux run this command to create a binary file for linux/amd64 architecture:

GOOS=linux GOARCH=amd64 go build

For batch build use Makefile and run:

make build

It will create builds directory with archived binary files according to preconfigured set of platforms.

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.

If you have any ideas or inspiration for contributing the project, please create an issue or pull request.