podman

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//go:build !remote
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package emulation
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import (
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	"fmt"
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	"strings"
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	"testing"
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	"github.com/stretchr/testify/assert"
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	"github.com/stretchr/testify/require"
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)
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// parseBinfmtMisc parses a binfmt_misc registry entry.  It returns the offset,
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// magic, and mask values, or an error if there was an error parsing the data.
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// If the returned offset is negative, the entry was disabled or should be
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// non-fatally ignored for some other reason.
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func TestParseBinfmtMisc(t *testing.T) {
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	vectors := []struct {
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		platform, contents string
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	}{
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		{
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			"linux/386",
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			`
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			enabled
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			interpreter /usr/bin/qemu-i386-static
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			flags: F
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			offset 0
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			magic 7f454c4601010100000000000000000002000300
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			mask  fffffffffffefe00fffffffffffffffffeffffff
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			`,
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		},
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		{
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			"linux/amd64",
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			`
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			enabled
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			interpreter /usr/bin/qemu-x86_64-static
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			flags: F
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			offset 0
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			magic 7f454c4602010100000000000000000002003e00
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			mask  fffffffffffefe00fffffffffffffffffeffffff
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			`,
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		},
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		{
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			"linux/arm",
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			`
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			enabled
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			interpreter /usr/bin/qemu-arm-static
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			flags: F
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			offset 0
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			magic 7f454c4601010100000000000000000002002800
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			mask  ffffffffffffff00fffffffffffffffffeffffff
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			`,
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		},
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		{
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			"linux/arm64",
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			`
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			enabled
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			interpreter /usr/bin/qemu-aarch64-static
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			flags: F
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			offset 0
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			magic 7f454c460201010000000000000000000200b700
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			mask  ffffffffffffff00fffffffffffffffffeffffff
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			`,
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		},
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		{
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			"linux/ppc64le",
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			`
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			enabled
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			interpreter /usr/bin/qemu-ppc64le-static
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			flags: F
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			offset 0
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			magic 7f454c4602010100000000000000000002001500
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			mask  ffffffffffffff00fffffffffffffffffeffff00
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			`,
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		},
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		{
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			"linux/s390x",
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			`
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			enabled
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			interpreter /usr/bin/qemu-s390x-static
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			flags: F
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			offset 0
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			magic 7f454c4602020100000000000000000000020016
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			mask  ffffffffffffff00fffffffffffffffffffeffff
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			`,
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		},
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	}
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	for i := range vectors {
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		v := vectors[i]
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		t.Run(v.platform, func(t *testing.T) {
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			offset, magic, mask, err := parseBinfmtMisc(fmt.Sprintf("test vector %d", i), strings.NewReader(v.contents))
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			require.NoError(t, err, "parseBinfmtMisc: %v", err)
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			require.GreaterOrEqual(t, offset, 0, "%q shouldn't have been disabled", v.platform)
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			headers := getKnownELFPlatformHeaders()[v.platform]
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			matched := false
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			for _, header := range headers {
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				if magicMatch(header, offset, mask, magic) {
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					matched = true
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				}
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			}
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			assert.True(t, matched, "%q did not match an expected header match", v.platform)
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		})
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	}
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}
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