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testsuite_cli_test.go
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testsuite_cli_test.go
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package earlyoom_testsuite
import (
"fmt"
"io/ioutil"
"math"
"os"
"strconv"
"strings"
"testing"
)
type cliTestCase struct {
// arguments to pass to earlyoom
args []string
// expected exit code
code int
// stdout must contain
stdoutContains string
// stdout must be empty?
stdoutEmpty bool
// stderr must contain
stderrContains string
// stderr must be empty?
stderrEmpty bool
}
func parseMeminfoLine(l string) int64 {
fields := strings.Split(l, " ")
asciiVal := fields[len(fields)-2]
val, err := strconv.ParseInt(asciiVal, 10, 64)
if err != nil {
panic(err)
}
return val
}
func parseMeminfo() (memTotal int64, swapTotal int64) {
/*
/proc/meminfo looks like this:
MemTotal: 8024108 kB
[...]
SwapTotal: 102396 kB
[...]
*/
content, err := ioutil.ReadFile("/proc/meminfo")
if err != nil {
panic(err)
}
lines := strings.Split(string(content), "\n")
for _, l := range lines {
if strings.HasPrefix(l, "MemTotal:") {
memTotal = parseMeminfoLine(l)
}
if strings.HasPrefix(l, "SwapTotal:") {
swapTotal = parseMeminfoLine(l)
}
}
return
}
// earlyoom RSS should never be above 1 MiB,
// but on some systems, it is (due to glibc?).
// https://github.com/rfjakob/earlyoom/issues/221
// https://github.com/rfjakob/earlyoom/issues/296
const rssMaxKiB = 4096
func TestCli(t *testing.T) {
memTotal, swapTotal := parseMeminfo()
mem1percent := fmt.Sprintf("%d", memTotal*1/100)
swap2percent := fmt.Sprintf("%d", swapTotal*2/100)
tooBigInt32 := fmt.Sprintf("%d", uint64(math.MaxInt32+1))
tooBigUint32 := fmt.Sprintf("%d", uint64(math.MaxUint32+1))
// earlyoom startup looks like this:
// earlyoom v1.1-5-g74a364b-dirty
// mem total: 7836 MiB, min: 783 MiB (10 %)
// swap total: 0 MiB, min: 0 MiB (10 %)
// startupMsg matches the last line of the startup output.
const startupMsg = "swap total: "
testcases := []cliTestCase{
// Both -h and --help should show the help text
{args: []string{"-h"}, code: 0, stderrContains: "this help text", stdoutEmpty: true},
{args: []string{"--help"}, code: 0, stderrContains: "this help text", stdoutEmpty: true},
{args: nil, code: -1, stderrContains: startupMsg, stdoutContains: memReport},
{args: []string{"-p"}, code: -1, stdoutContains: memReport},
{args: []string{"-v"}, code: 0, stderrContains: "earlyoom v", stdoutEmpty: true},
{args: []string{"-d"}, code: -1, stdoutContains: "new victim"},
{args: []string{"-m", "1"}, code: -1, stderrContains: " 1.00%", stdoutContains: memReport},
{args: []string{"-m", "0"}, code: 15, stderrContains: "fatal", stdoutEmpty: true},
{args: []string{"-m", "-10"}, code: 15, stderrContains: "fatal", stdoutEmpty: true},
// Using "-m 100" makes no sense
{args: []string{"-m", "100"}, code: 15, stderrContains: "fatal", stdoutEmpty: true},
{args: []string{"-s", "2"}, code: -1, stderrContains: " 2.00%", stdoutContains: memReport},
// Using "-s 100" is a valid way to ignore swap usage
{args: []string{"-s", "100"}, code: -1, stderrContains: " 100.00%", stdoutContains: memReport},
{args: []string{"-s", "101"}, code: 16, stderrContains: "fatal", stdoutEmpty: true},
{args: []string{"-s", "0"}, code: 16, stderrContains: "fatal", stdoutEmpty: true},
{args: []string{"-s", "-10"}, code: 16, stderrContains: "fatal", stdoutEmpty: true},
{args: []string{"-M", mem1percent}, code: -1, stderrContains: " 1.00%", stdoutContains: memReport},
{args: []string{"-M", "9999999999999999"}, code: 15, stderrContains: "fatal", stdoutEmpty: true},
// We use {"-r=0"} instead of {"-r", "0"} so runEarlyoom() can detect that there will be no output
{args: []string{"-r=0"}, code: -1, stderrContains: startupMsg, stdoutEmpty: true},
{args: []string{"-r", "0.1"}, code: -1, stderrContains: startupMsg, stdoutContains: memReport},
// Test --avoid, --prefer, --ignore-root-user and --sort-by-rss
{args: []string{"--avoid", "MyProcess1"}, code: -1, stderrContains: "Will avoid killing", stdoutContains: memReport},
{args: []string{"--prefer", "MyProcess2"}, code: -1, stderrContains: "Preferring to kill", stdoutContains: memReport},
{args: []string{"--ignore-root-user"}, code: -1, stderrContains: "Processes owned by root will not be killed", stdoutContains: memReport},
{args: []string{"--sort-by-rss"}, code: -1, stderrContains: "Find process with the largest rss", stdoutContains: memReport},
{args: []string{"-i"}, code: -1, stderrContains: "Option -i is ignored"},
// Extra arguments should error out
{args: []string{"xyz"}, code: 13, stderrContains: "extra argument not understood", stdoutEmpty: true},
{args: []string{"-i", "1"}, code: 13, stderrContains: "extra argument not understood", stdoutEmpty: true},
// Tuples
{args: []string{"-m", "2,1"}, code: -1, stderrContains: "sending SIGTERM when mem avail <= 2.00% and swap free <= 10.00%", stdoutContains: memReport},
{args: []string{"-m", "1,2"}, code: -1, stdoutContains: memReport},
{args: []string{"-m", "1,-1"}, code: 15, stderrContains: "fatal", stdoutEmpty: true},
{args: []string{"-m", "1000,-1000"}, code: 15, stderrContains: "fatal", stdoutEmpty: true},
{args: []string{"-s", "2,1"}, code: -1, stderrContains: "sending SIGTERM when mem avail <= 10.00% and swap free <= 2.00%", stdoutContains: memReport},
{args: []string{"-s", "1,2"}, code: -1, stdoutContains: memReport},
// https://github.com/rfjakob/earlyoom/issues/97
{args: []string{"-m", "5,0"}, code: -1, stdoutContains: memReport},
{args: []string{"-m", "5,9"}, code: -1, stdoutContains: memReport},
// check for integer overflows
{args: []string{"-M", "-1"}, code: 15, stderrContains: "fatal", stdoutEmpty: true},
{args: []string{"-M", tooBigInt32}, code: 15, stderrContains: "fatal", stdoutEmpty: true},
{args: []string{"-M", tooBigUint32}, code: 15, stderrContains: "fatal", stdoutEmpty: true},
{args: []string{"-m", "-1"}, code: 15, stderrContains: "fatal", stdoutEmpty: true},
{args: []string{"-m", tooBigInt32}, code: 15, stderrContains: "fatal", stdoutEmpty: true},
{args: []string{"-m", tooBigUint32}, code: 15, stderrContains: "fatal", stdoutEmpty: true},
{args: []string{"-S", "-1"}, code: 16, stderrContains: "fatal", stdoutEmpty: true},
{args: []string{"-S", tooBigInt32}, code: 16, stderrContains: "fatal", stdoutEmpty: true},
{args: []string{"-S", tooBigUint32}, code: 16, stderrContains: "fatal", stdoutEmpty: true},
{args: []string{"-s", "-1"}, code: 16, stderrContains: "fatal", stdoutEmpty: true},
{args: []string{"-s", tooBigInt32}, code: 16, stderrContains: "fatal", stdoutEmpty: true},
{args: []string{"-s", tooBigUint32}, code: 16, stderrContains: "fatal", stdoutEmpty: true},
// Floating point values
{args: []string{"-m", "3.14"}, code: -1, stderrContains: "SIGTERM when mem avail <= 3.14%", stdoutContains: memReport},
{args: []string{"-m", "7,3.14"}, code: -1, stderrContains: "SIGKILL when mem avail <= 3.14%", stdoutContains: memReport},
{args: []string{"-s", "12.34"}, code: -1, stderrContains: "swap free <= 12.34%", stdoutContains: memReport},
// Use both -m/-M
{args: []string{"-m", "10", "-M", mem1percent}, code: -1, stderrContains: "SIGTERM when mem avail <= 1.00%", stdoutContains: memReport},
}
if swapTotal > 0 {
// Tests that cannot work when there is no swap enabled
tc := []cliTestCase{
{args: []string{"-S", swap2percent}, code: -1, stderrContains: " 2.00%", stdoutContains: memReport},
// Use both -s/-S
{args: []string{"-s", "10", "-S", swap2percent}, code: -1, stderrContains: "swap free <= 1.00%", stdoutContains: memReport},
}
testcases = append(testcases, tc...)
}
for _, tc := range testcases {
name := fmt.Sprintf("%s", strings.Join(tc.args, " "))
t.Run(name, func(t *testing.T) {
pass := true
res := runEarlyoom(t, tc.args...)
if res.code != tc.code {
t.Errorf("wrong exit code: have=%d want=%d", res.code, tc.code)
pass = false
}
if tc.stdoutEmpty && res.stdout != "" {
t.Errorf("stdout should be empty but is not")
pass = false
}
if !strings.Contains(res.stdout, tc.stdoutContains) {
t.Errorf("stdout should contain %q, but does not", tc.stdoutContains)
pass = false
}
if tc.stderrEmpty && res.stderr != "" {
t.Errorf("stderr should be empty, but is not")
pass = false
}
if !strings.Contains(res.stderr, tc.stderrContains) {
t.Errorf("stderr should contain %q, but does not", tc.stderrContains)
pass = false
}
if res.rss > rssMaxKiB {
t.Errorf("Memory usage too high! actual rss: %d, rssMax: %d", res.rss, rssMaxKiB)
pass = false
}
if res.fds > openFdsMax {
if os.Getenv("GITHUB_ACTIONS") == "true" {
t.Log("Ignoring fd leak. Github Actions bug? See https://github.com/actions/runner/issues/1188")
} else {
t.Fatalf("High number of open file descriptors: %d", res.fds)
}
}
if !pass {
const empty = "(empty)"
if res.stderr == "" {
res.stderr = empty
}
if res.stdout == "" {
res.stdout = empty
}
t.Logf("stderr:\n%s", res.stderr)
t.Logf("stdout:\n%s", res.stdout)
}
})
}
}
func TestRss(t *testing.T) {
res := runEarlyoom(t)
if res.rss == 0 {
t.Error("rss is zero!?")
}
if res.rss > rssMaxKiB {
t.Errorf("rss above %d kiB", rssMaxKiB)
}
t.Logf("earlyoom RSS: %d kiB", res.rss)
}