mirror of https://github.com/ethereum/go-ethereum
all: make vendored copy of reexec (#28382)
a little copying is better than a little dependency -- go proverb We have this dependency on docker, a.k.a moby: a gigantic library, and we only need ~70 LOC, so here I tried moving it inline instead. Co-authored-by: Felix Lange <fjl@twurst.com>pull/28432/head
Martin Holst Swende
1 year ago
committed by
GitHub
parent
2d7dba024d
commit
233db64cc1
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// This file originates from Docker/Moby,
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// https://github.com/moby/moby/blob/master/pkg/reexec/reexec.go
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// Licensed under Apache License 2.0: https://github.com/moby/moby/blob/master/LICENSE
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// Copyright 2013-2018 Docker, Inc.
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//
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// Package reexec facilitates the busybox style reexec of the docker binary that
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// we require because of the forking limitations of using Go. Handlers can be
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// registered with a name and the argv 0 of the exec of the binary will be used
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// to find and execute custom init paths.
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package reexec |
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import ( |
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"fmt" |
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"os" |
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) |
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var registeredInitializers = make(map[string]func()) |
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// Register adds an initialization func under the specified name
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func Register(name string, initializer func()) { |
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if _, exists := registeredInitializers[name]; exists { |
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panic(fmt.Sprintf("reexec func already registered under name %q", name)) |
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} |
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registeredInitializers[name] = initializer |
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} |
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// Init is called as the first part of the exec process and returns true if an
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// initialization function was called.
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func Init() bool { |
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if initializer, ok := registeredInitializers[os.Args[0]]; ok { |
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initializer() |
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return true |
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} |
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return false |
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} |
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@ -0,0 +1,14 @@ |
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// This file originates from Docker/Moby,
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// https://github.com/moby/moby/blob/master/pkg/reexec/
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// Licensed under Apache License 2.0: https://github.com/moby/moby/blob/master/LICENSE
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// Copyright 2013-2018 Docker, Inc.
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//go:build linux
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package reexec |
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// Self returns the path to the current process's binary.
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// Returns "/proc/self/exe".
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func Self() string { |
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return "/proc/self/exe" |
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} |
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@ -0,0 +1,32 @@ |
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// This file originates from Docker/Moby,
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// https://github.com/moby/moby/blob/master/pkg/reexec/
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// Licensed under Apache License 2.0: https://github.com/moby/moby/blob/master/LICENSE
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// Copyright 2013-2018 Docker, Inc.
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//go:build !linux
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package reexec |
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import ( |
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"os" |
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"os/exec" |
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"path/filepath" |
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) |
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// Self returns the path to the current process's binary.
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// Uses os.Args[0].
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func Self() string { |
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name := os.Args[0] |
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if filepath.Base(name) == name { |
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if lp, err := exec.LookPath(name); err == nil { |
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return lp |
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} |
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} |
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// handle conversion of relative paths to absolute
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if absName, err := filepath.Abs(name); err == nil { |
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return absName |
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} |
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// if we couldn't get absolute name, return original
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// (NOTE: Go only errors on Abs() if os.Getwd fails)
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return name |
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} |
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