41 lines
1.1 KiB
Go
41 lines
1.1 KiB
Go
package helper
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import (
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"context"
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"errors"
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"io"
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"sync"
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"git.gensokyo.uk/security/fortify/helper/proc"
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)
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// direct wraps *exec.Cmd and manages status and args fd.
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// Args is always 3 and status if set is always 4.
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type direct struct {
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lock sync.RWMutex
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*helperCmd
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}
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func (h *direct) Start(stat bool) error {
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h.lock.Lock()
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defer h.lock.Unlock()
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// Check for doubled Start calls before we defer failure cleanup. If the prior
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// call to Start succeeded, we don't want to spuriously close its pipes.
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if h.Cmd != nil && h.Cmd.Process != nil {
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return errors.New("exec: already started")
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}
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args := h.finalise(stat)
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h.Cmd.Args = append(h.Cmd.Args, args...)
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return proc.Fulfill(h.ctx, h.Cmd, h.files, h.extraFiles)
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}
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// New initialises a new direct Helper instance with wt as the null-terminated argument writer.
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// Function argF returns an array of arguments passed directly to the child process.
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func New(ctx context.Context, wt io.WriterTo, name string, argF func(argsFd, statFd int) []string) Helper {
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d := new(direct)
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d.helperCmd = newHelperCmd(d, ctx, name, wt, argF, nil)
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return d
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}
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