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e1bdbc7d27
I figured out that running `cat syft.json | grype` works but `grype < syft.json` does not work. This happens, because the IsPipedInput method only checks if stdin is a pipe which will be false if stdin is fed by a redirect. The go idiomatic way to fix this is by just checking if the file produced by stat has a size > 0. Implemented this check, that will recognize stdin by redirect, in the IsPipedInput() method. Renamed the method to IsStdinPipeOrRedirect(). Signed-off-by: Felix Becker <git@felixbecker.name> Co-authored-by: Benjamin Neff <benjamin@coding4coffee.ch>
20 lines
802 B
Go
20 lines
802 B
Go
package internal
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import (
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"fmt"
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"os"
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)
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// IsStdinPipeOrRedirect returns true if stdin is provided via pipe or redirect
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func IsStdinPipeOrRedirect() (bool, error) {
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fi, err := os.Stdin.Stat()
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if err != nil {
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return false, fmt.Errorf("unable to determine if there is piped input: %w", err)
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}
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// note: we should NOT use the absence of a character device here as the hint that there may be input expected
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// on stdin, as running grype as a subprocess you would expect no character device to be present but input can
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// be from either stdin or indicated by the CLI. Checking if stdin is a pipe is the most direct way to determine
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// if there *may* be bytes that will show up on stdin that should be used for the analysis source.
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return fi.Mode()&os.ModeNamedPipe != 0 || fi.Size() > 0, nil
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}
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