mirror of
https://github.com/fleetdm/fleet
synced 2026-05-14 12:38:41 +00:00
64 lines
1.7 KiB
Go
64 lines
1.7 KiB
Go
// based on github.com/kolide/launcher/pkg/osquery/tables
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package tablehelpers
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// based on https://github.com/fleetdm/launcher/blob/main/pkg/osquery/tables/tablehelpers
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import (
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"bytes"
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"context"
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"fmt"
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"os"
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"os/exec"
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"time"
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"github.com/go-kit/log"
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"github.com/go-kit/log/level"
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)
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// Exec is a wrapper over exec.CommandContext. It does a couple of
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// additional things to help with table usage:
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// 1. It enforces a timeout.
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// 2. Second, it accepts an array of possible binaries locations, and if something is not
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// found, it will go down the list.
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// 3. It moves the stderr into the return error, if needed.
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//
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// This is not suitable for high performance work -- it allocates new buffers each time.
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func Exec(ctx context.Context, logger log.Logger, timeoutSeconds int, possibleBins []string, args []string, includeStderr bool) ([]byte, error) {
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ctx, cancel := context.WithTimeout(ctx, time.Duration(timeoutSeconds)*time.Second)
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defer cancel()
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var stdout bytes.Buffer
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var stderr bytes.Buffer
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for _, bin := range possibleBins {
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stdout.Reset()
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stderr.Reset()
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cmd := exec.CommandContext(ctx, bin, args...)
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cmd.Stdout = &stdout
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if includeStderr {
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cmd.Stderr = &stdout
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} else {
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cmd.Stderr = &stderr
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}
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level.Debug(logger).Log(
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"msg", "execing",
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"cmd", cmd.String(),
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)
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switch err := cmd.Run(); {
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case err == nil:
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return stdout.Bytes(), nil
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case os.IsNotExist(err):
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// try the next binary
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continue
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default:
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// an actual error
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return nil, fmt.Errorf("exec '%s'. Got: '%s': %w", cmd.String(), string(stderr.Bytes()), err)
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}
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}
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// Getting here means no binary was found
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return nil, fmt.Errorf("No binary found in specified paths: %v: %w", possibleBins, os.ErrNotExist)
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}
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