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Set a Remote File's POSIX Permissions

Demonstrates the Chilkat SFtp.SetPermissions method, which sets the POSIX permission bits of a remote item. The arguments are the remote path (or handle), whether the first argument is a handle, and the permission bits. Pass the permission bits only, not the file-type bits.

Background: This is the SFTP equivalent of chmod. Common values, written as octal, are 0644 for a normal file, 0600 for a private file, and 0755 for an executable or a directory. In languages without octal literals the same values must be given in decimal or hexadecimal (for example 0755 is decimal 493). Setting an executable bit after uploading a script is the classic use.

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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 SFtp.SetPermissions method, which sets the POSIX permission bits of a remote
    // item.  The 1st argument is the remote path (or handle), the 2nd (isHandle) indicates which,
    // and the 3rd is the permission bits.

    const sftp = try chilkat.SFtp.init();
    defer sftp.deinit();

    // Connect, authenticate, and initialize the SFTP subsystem.
    const port = 22;
    sftp.connect("sftp.example.com", port) catch {
        std.debug.print("{s}\n", .{try sftp.getLastErrorText(alloc)});
        return;
    };

    // 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.
    const password = "mySshPassword";

    sftp.authenticatePw("mySshLogin", password) catch {
        std.debug.print("{s}\n", .{try sftp.getLastErrorText(alloc)});
        return;
    };

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

    // The 1st argument is a path, so isHandle is false.
    const is_handle = false;

    // Pass the permission bits, not the file-type bits.  0755 gives the owner read/write/execute and
    // read/execute to group and others -- a common mode for an executable script.
    const permissions = 493;
    sftp.setPermissions("subdir/script.sh", is_handle, permissions) catch {
        std.debug.print("{s}\n", .{try sftp.getLastErrorText(alloc)});
        return;
    };

    std.debug.print("Permissions set.\n", .{});

    sftp.disconnect();
}