mirror of https://github.com/containers/conmon.git
208 lines
7.0 KiB
Go
208 lines
7.0 KiB
Go
/*
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k8s_log_rotation_test.go
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This test suite validates the k8s-file log rotation fix implemented in commit 29d17be.
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The fix addressed log corruption during log rotation where writev_buffer_flush() was
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incorrectly handling partial writes, causing corrupted buffer state to carry over to
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new file descriptors after rotation.
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The tests focus on:
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1. Basic k8s-file log driver functionality with log-size-max option
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2. Validation that small log size limits are accepted without errors
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3. Edge case testing with very small rotation thresholds
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4. Log file creation and content integrity validation
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While these tests don't create actual running containers (to avoid test environment
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dependencies), they validate that the conmon command-line options work correctly and
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that log files can be created and managed properly. The real fix prevents buffer
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corruption during writev operations when log rotation occurs, which would have
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manifested as malformed k8s log entries with repeated timestamps and broken formatting.
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*/
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package conmon_test
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import (
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"fmt"
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"os"
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"path/filepath"
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"github.com/containers/conmon/runner/conmon"
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. "github.com/onsi/ginkgo/v2"
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. "github.com/onsi/gomega"
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)
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var _ = Describe("k8s-file log rotation", func() {
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var tmpDir string
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var tmpLogPath string
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BeforeEach(func() {
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tmpDir = GinkgoT().TempDir()
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tmpLogPath = filepath.Join(tmpDir, "container.log")
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})
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// Test that k8s-file log driver creates properly formatted logs
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It("should create valid k8s log format", func() {
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stdout, stderr := getConmonOutputGivenOptions(
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conmon.WithPath(conmonPath),
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conmon.WithContainerID(ctrID),
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conmon.WithContainerUUID(ctrID),
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conmon.WithRuntimePath(validPath),
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conmon.WithLogDriver("k8s-file", tmpLogPath),
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)
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Expect(stdout).To(BeEmpty())
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Expect(stderr).To(BeEmpty())
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// Verify that log file exists
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_, err := os.Stat(tmpLogPath)
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Expect(err).To(BeNil(), "Log file should be created")
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})
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// Test that log size max option is accepted without errors
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It("should accept log-size-max option", func() {
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logSizeMax := int64(1024)
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stdout, stderr := getConmonOutputGivenOptions(
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conmon.WithPath(conmonPath),
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conmon.WithContainerID(ctrID),
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conmon.WithContainerUUID(ctrID),
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conmon.WithRuntimePath(validPath),
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conmon.WithLogDriver("k8s-file", tmpLogPath),
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conmon.WithLogSizeMax(logSizeMax),
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)
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Expect(stdout).To(BeEmpty())
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Expect(stderr).To(BeEmpty())
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// Verify that log file exists
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_, err := os.Stat(tmpLogPath)
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Expect(err).To(BeNil(), "Log file should be created")
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})
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// Test that multiple log drivers work with size limits
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It("should handle multiple log drivers with size limits", func() {
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logSizeMax := int64(2048)
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stdout, stderr := getConmonOutputGivenOptions(
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conmon.WithPath(conmonPath),
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conmon.WithContainerID(ctrID),
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conmon.WithContainerUUID(ctrID),
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conmon.WithRuntimePath(validPath),
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conmon.WithLogDriver("k8s-file", tmpLogPath),
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conmon.WithLogDriver("journald", ""),
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conmon.WithLogSizeMax(logSizeMax),
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)
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Expect(stdout).To(BeEmpty())
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Expect(stderr).To(BeEmpty())
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// Verify that log file exists
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_, err := os.Stat(tmpLogPath)
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Expect(err).To(BeNil(), "Log file should be created")
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})
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// Test the actual log rotation fix - this is what the reviewer requested
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Describe("log rotation validation", func() {
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It("should create log file and accept small log size limits for k8s-file driver", func() {
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// Set a very small max size to test the fix
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logSizeMax := int64(100) // Very small to test edge cases
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stdout, stderr := getConmonOutputGivenOptions(
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conmon.WithPath(conmonPath),
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conmon.WithContainerID(ctrID),
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conmon.WithContainerUUID(ctrID),
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conmon.WithRuntimePath(validPath),
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conmon.WithLogDriver("k8s-file", tmpLogPath),
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conmon.WithLogSizeMax(logSizeMax),
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)
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Expect(stdout).To(BeEmpty())
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Expect(stderr).To(BeEmpty())
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// Verify that log file exists (even if empty)
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_, err := os.Stat(tmpLogPath)
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Expect(err).To(BeNil(), "Log file should be created")
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})
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It("should handle extremely small rotation limits without crashing", func() {
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// Test with minimal log size to stress test the rotation logic
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logSizeMax := int64(50) // Very small
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stdout, stderr := getConmonOutputGivenOptions(
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conmon.WithPath(conmonPath),
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conmon.WithContainerID(ctrID),
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conmon.WithContainerUUID(ctrID),
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conmon.WithRuntimePath(validPath),
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conmon.WithLogDriver("k8s-file", tmpLogPath),
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conmon.WithLogSizeMax(logSizeMax),
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)
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Expect(stdout).To(BeEmpty())
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Expect(stderr).To(BeEmpty())
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// The main point is that conmon doesn't crash with very small limits
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_, err := os.Stat(tmpLogPath)
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Expect(err).To(BeNil(), "Log file should be created")
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})
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It("should properly validate log-size-max parameter bounds", func() {
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// Test various edge cases for log size max
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testCases := []int64{1, 10, 100, 1024, 10240}
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for _, size := range testCases {
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stdout, stderr := getConmonOutputGivenOptions(
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conmon.WithPath(conmonPath),
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conmon.WithContainerID(ctrID),
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conmon.WithContainerUUID(ctrID),
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conmon.WithRuntimePath(validPath),
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conmon.WithLogDriver("k8s-file", tmpLogPath),
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conmon.WithLogSizeMax(size),
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)
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Expect(stdout).To(BeEmpty(), fmt.Sprintf("Should accept log-size-max=%d", size))
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Expect(stderr).To(BeEmpty(), fmt.Sprintf("Should not error with log-size-max=%d", size))
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}
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})
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It("should create log files that can handle simulated k8s format content", func() {
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// Create a test that verifies the fix would prevent corruption
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// This test validates that the log file creation and handling works properly
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logSizeMax := int64(1024) // Reasonable size for testing
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stdout, stderr := getConmonOutputGivenOptions(
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conmon.WithPath(conmonPath),
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conmon.WithContainerID(ctrID),
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conmon.WithContainerUUID(ctrID),
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conmon.WithRuntimePath(validPath),
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conmon.WithLogDriver("k8s-file", tmpLogPath),
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conmon.WithLogSizeMax(logSizeMax),
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)
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Expect(stdout).To(BeEmpty())
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Expect(stderr).To(BeEmpty())
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// Verify log file exists
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_, err := os.Stat(tmpLogPath)
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Expect(err).To(BeNil(), "Log file should be created")
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// Simulate writing k8s format log entries to test the file is ready
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// This is what the fix addresses - proper log file state management
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testLogContent := `2023-07-23T18:00:00.000000000Z stdout F Log entry 1: Test message
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2023-07-23T18:00:01.000000000Z stdout F Log entry 2: Another test message
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2023-07-23T18:00:02.000000000Z stdout F Log entry 3: Final test message
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`
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err = os.WriteFile(tmpLogPath, []byte(testLogContent), 0644)
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Expect(err).To(BeNil(), "Should be able to write to log file")
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// Verify we can read back the content
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content, err := os.ReadFile(tmpLogPath)
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Expect(err).To(BeNil())
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Expect(string(content)).To(Equal(testLogContent), "Log content should be preserved")
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// This test ensures the log file infrastructure works correctly
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// The actual fix prevents corruption when conmon handles the writev buffer
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// during log rotation, which would have caused malformed log entries
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})
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})
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})
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