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749e55c738
* caddycmd: Add `--skip-cleanup` to upgrade commands This is a partial fix for https://github.com/caddyserver/caddy/issues/4057, making it possible to retain the old build of Caddy, in case something went wrong. * caddycmd: Fix duplicate error message The error message "download succeeded, but unable to execute" was repeated, because it was both in the `listModules`/`showVersion` functions and in the calling `upgradeBuild` function. Oversight when this was refactored. * caddycmd: Implement fix for performing cleanup on Windows Without this, the cleanup operation would fail with an error message like this: upgrade: download succeeded, but unable to clean up backup binary: remove C:\caddy\caddy.exe.tmp: Access is denied. * caddycmd: Rename to `--keep-backup`, simplify build constraints
36 lines
1.4 KiB
Go
36 lines
1.4 KiB
Go
// Copyright 2015 Matthew Holt and The Caddy Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package caddycmd
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import (
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"os"
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"path/filepath"
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"syscall"
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)
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// removeCaddyBinary removes the Caddy binary at the given path.
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//
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// On Windows, this uses a syscall to indirectly remove the file,
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// because otherwise we get an "Access is denied." error when trying
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// to delete the binary while Caddy is still running and performing
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// the upgrade. "cmd.exe /C" executes a command specified by the
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// following arguments, i.e. "del" which will run as a separate process,
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// which avoids the "Access is denied." error.
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func removeCaddyBinary(path string) error {
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var sI syscall.StartupInfo
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var pI syscall.ProcessInformation
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argv := syscall.StringToUTF16Ptr(filepath.Join(os.Getenv("windir"), "system32", "cmd.exe") + " /C del " + path)
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return syscall.CreateProcess(nil, argv, nil, nil, true, 0, nil, nil, &sI, &pI)
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}
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