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Sync a Local Tree Up with Preview and Traversal Control

Demonstrates the Chilkat Ftp2.SyncRemoteTree2 method, which uploads a local tree to the current remote directory with extra controls. The arguments are the local root, the upload mode, whether to descend into subdirectories, and whether to run preview-only. In preview mode the results are available via the SyncPreview property.

Note: The local paths are relative to the application's current working directory. Absolute paths may also be used. Supply the paths appropriate to your own environment.

Background: The preview flag is what makes this valuable: run it first to see exactly which files would be uploaded — without transferring anything — then run it again for real once the plan looks right. That dry-run step is a strong safeguard before a large or destructive-looking sync. The descend flag lets you limit the operation to the top level, and the mode is the same set of upload rules as SyncRemoteTree.

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const std = @import("std");
const chilkat = @import("chilkat");

pub fn main(init: std.process.Init) !void {
    const alloc = init.arena.allocator();

    // Demonstrates the Ftp2.SyncRemoteTree2 method, which uploads a local tree to the current remote
    // directory with extra traversal and preview controls.  The 1st argument is the local root, the
    // 2nd is the upload mode, the 3rd selects whether to descend into subdirectories, and the 4th
    // selects preview-only (no actual transfers).

    const ftp = try chilkat.Ftp2.init();
    defer ftp.deinit();

    ftp.setHostname("ftp.example.com");
    ftp.setUsername("myFtpLogin");

    // Normally you would not hard-code the password in source.  You should instead obtain it
    // from an interactive prompt, environment variable, or a secrets vault.
    ftp.setPassword("myPassword");

    ftp.connect() catch {
        std.debug.print("{s}\n", .{try ftp.getLastErrorText(alloc)});
        return;
    };

    ftp.changeRemoteDir("public_html") catch {
        std.debug.print("{s}\n", .{try ftp.getLastErrorText(alloc)});
        return;
    };

    //   0 = all selected files
    //   1 = files missing on the server
    //   2 = missing, or newer locally
    //   3 = only files that exist remotely and are newer locally
    //   4 = missing, or a different size
    //   5 = missing, different size, or newer locally

    const mode = 5;

    // Descend into subdirectories.
    const b_descend = true;

    // Preview only: determine what WOULD be uploaded without transferring anything.  The results are
    // available via the SyncPreview property.
    const b_preview_only = true;

    ftp.syncRemoteTree2("qa_data/site", mode, b_descend, b_preview_only) catch {
        std.debug.print("{s}\n", .{try ftp.getLastErrorText(alloc)});
        return;
    };

    // SyncPreview lists the files that would be uploaded.
    std.debug.print("{s}\n", .{try ftp.getSyncPreview(alloc)});

    ftp.disconnect() catch {
        std.debug.print("{s}\n", .{try ftp.getLastErrorText(alloc)});
        return;
    };
}