3e31ee9455
With the recent merging of embedded package imports and the entry CLI package, it is now possible for users to build in mcl code into a single binary. This additional permission makes it explicitly clear that this is permitted to make it easier for those users. The condition is phrased so that the terms can be "patched" by the original author if it's necessary for the project. For example, if the name of the language (mcl) changes, has a differently named new version, someone finds a phrasing improvement or a legal loophole, or for some other reasonable circumstance. Now go write some beautiful embedded tools!
68 lines
2.7 KiB
Go
68 lines
2.7 KiB
Go
// Mgmt
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// Copyright (C) 2013-2024+ James Shubin and the project contributors
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// Written by James Shubin <james@shubin.ca> and the project contributors
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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//
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// Additional permission under GNU GPL version 3 section 7
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//
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// If you modify this program, or any covered work, by linking or combining it
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// with embedded mcl code and modules (and that the embedded mcl code and
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// modules which link with this program, contain a copy of their source code in
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// the authoritative form) containing parts covered by the terms of any other
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// license, the licensors of this program grant you additional permission to
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// convey the resulting work. Furthermore, the licensors of this program grant
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// the original author, James Shubin, additional permission to update this
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// additional permission if he deems it necessary to achieve the goals of this
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// additional permission.
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// Package errwrap contains some error helpers.
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package errwrap
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import (
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"github.com/hashicorp/go-multierror"
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"github.com/pkg/errors"
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)
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// Wrapf adds a new error onto an existing chain of errors. If the new error to
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// be added is nil, then the old error is returned unchanged.
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func Wrapf(err error, format string, args ...interface{}) error {
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return errors.Wrapf(err, format, args...)
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}
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// Append can be used to safely append an error onto an existing one. If you
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// pass in a nil error to append, the existing error will be returned unchanged.
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// If the existing error is already nil, then the new error will be returned
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// unchanged. This makes it easy to use Append as a safe `reterr += err`, when
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// you don't know if either is nil or not.
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func Append(reterr, err error) error {
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if reterr == nil { // keep it simple, pass it through
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return err // which might even be nil
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}
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if err == nil { // no error, so don't do anything
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return reterr
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}
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// both are real errors
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return multierror.Append(reterr, err)
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}
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// String returns a string representation of the error. In particular, if the
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// error is nil, it returns an empty string instead of panicing.
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func String(err error) string {
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if err == nil {
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return ""
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}
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return err.Error()
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}
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