package main import ( "os" "github.com/docker/docker/integration-cli/checker" "github.com/go-check/check" ) // Try all of the test cases from the archive package which implements the // internals of `docker cp` and ensure that the behavior matches when actually // copying to and from containers. // Basic assumptions about SRC and DST: // 1. SRC must exist. // 2. If SRC ends with a trailing separator, it must be a directory. // 3. DST parent directory must exist. // 4. If DST exists as a file, it must not end with a trailing separator. // Check that copying from a local path to a symlink in a container copies to // the symlink target and does not overwrite the container symlink itself. func (s *DockerSuite) TestCpToSymlinkDestination(c *check.C) { // stat /tmp/test-cp-to-symlink-destination-262430901/vol3 gets permission denied for the user testRequires(c, NotUserNamespace) testRequires(c, DaemonIsLinux) testRequires(c, testEnv.IsLocalDaemon) // Requires local volume mount bind. testVol := getTestDir(c, "test-cp-to-symlink-destination-") defer os.RemoveAll(testVol) makeTestContentInDir(c, testVol) containerID := makeTestContainer(c, testContainerOptions{ volumes: defaultVolumes(testVol), // Our bind mount is at /vol2 }) // First, copy a local file to a symlink to a file in the container. This // should overwrite the symlink target contents with the source contents. srcPath := cpPath(testVol, "file2") dstPath := containerCpPath(containerID, "/vol2/symlinkToFile1") c.Assert(runDockerCp(c, srcPath, dstPath, nil), checker.IsNil) // The symlink should not have been modified. c.Assert(symlinkTargetEquals(c, cpPath(testVol, "symlinkToFile1"), "file1"), checker.IsNil) // The file should have the contents of "file2" now. c.Assert(fileContentEquals(c, cpPath(testVol, "file1"), "file2\n"), checker.IsNil) // Next, copy a local file to a symlink to a directory in the container. // This should copy the file into the symlink target directory. dstPath = containerCpPath(containerID, "/vol2/symlinkToDir1") c.Assert(runDockerCp(c, srcPath, dstPath, nil), checker.IsNil) // The symlink should not have been modified. c.Assert(symlinkTargetEquals(c, cpPath(testVol, "symlinkToDir1"), "dir1"), checker.IsNil) // The file should have the contents of "file2" now. c.Assert(fileContentEquals(c, cpPath(testVol, "file2"), "file2\n"), checker.IsNil) // Next, copy a file to a symlink to a file that does not exist (a broken // symlink) in the container. This should create the target file with the // contents of the source file. dstPath = containerCpPath(containerID, "/vol2/brokenSymlinkToFileX") c.Assert(runDockerCp(c, srcPath, dstPath, nil), checker.IsNil) // The symlink should not have been modified. c.Assert(symlinkTargetEquals(c, cpPath(testVol, "brokenSymlinkToFileX"), "fileX"), checker.IsNil) // The file should have the contents of "file2" now. c.Assert(fileContentEquals(c, cpPath(testVol, "fileX"), "file2\n"), checker.IsNil) // Next, copy a local directory to a symlink to a directory in the // container. This should copy the directory into the symlink target // directory and not modify the symlink. srcPath = cpPath(testVol, "/dir2") dstPath = containerCpPath(containerID, "/vol2/symlinkToDir1") c.Assert(runDockerCp(c, srcPath, dstPath, nil), checker.IsNil) // The symlink should not have been modified. c.Assert(symlinkTargetEquals(c, cpPath(testVol, "symlinkToDir1"), "dir1"), checker.IsNil) // The directory should now contain a copy of "dir2". c.Assert(fileContentEquals(c, cpPath(testVol, "dir1/dir2/file2-1"), "file2-1\n"), checker.IsNil) // Next, copy a local directory to a symlink to a local directory that does // not exist (a broken symlink) in the container. This should create the // target as a directory with the contents of the source directory. It // should not modify the symlink. dstPath = containerCpPath(containerID, "/vol2/brokenSymlinkToDirX") c.Assert(runDockerCp(c, srcPath, dstPath, nil), checker.IsNil) // The symlink should not have been modified. c.Assert(symlinkTargetEquals(c, cpPath(testVol, "brokenSymlinkToDirX"), "dirX"), checker.IsNil) // The "dirX" directory should now be a copy of "dir2". c.Assert(fileContentEquals(c, cpPath(testVol, "dirX/file2-1"), "file2-1\n"), checker.IsNil) } // Possibilities are reduced to the remaining 10 cases: // // case | srcIsDir | onlyDirContents | dstExists | dstIsDir | dstTrSep | action // =================================================================================================== // A | no | - | no | - | no | create file // B | no | - | no | - | yes | error // C | no | - | yes | no | - | overwrite file // D | no | - | yes | yes | - | create file in dst dir // E | yes | no | no | - | - | create dir, copy contents // F | yes | no | yes | no | - | error // G | yes | no | yes | yes | - | copy dir and contents // H | yes | yes | no | - | - | create dir, copy contents // I | yes | yes | yes | no | - | error // J | yes | yes | yes | yes | - | copy dir contents // // A. SRC specifies a file and DST (no trailing path separator) doesn't // exist. This should create a file with the name DST and copy the // contents of the source file into it. func (s *DockerSuite) TestCpToCaseA(c *check.C) { containerID := makeTestContainer(c, testContainerOptions{ workDir: "/root", command: makeCatFileCommand("itWorks.txt"), }) tmpDir := getTestDir(c, "test-cp-to-case-a") defer os.RemoveAll(tmpDir) makeTestContentInDir(c, tmpDir) srcPath := cpPath(tmpDir, "file1") dstPath := containerCpPath(containerID, "/root/itWorks.txt") c.Assert(runDockerCp(c, srcPath, dstPath, nil), checker.IsNil) c.Assert(containerStartOutputEquals(c, containerID, "file1\n"), checker.IsNil) } // B. SRC specifies a file and DST (with trailing path separator) doesn't // exist. This should cause an error because the copy operation cannot // create a directory when copying a single file. func (s *DockerSuite) TestCpToCaseB(c *check.C) { containerID := makeTestContainer(c, testContainerOptions{ command: makeCatFileCommand("testDir/file1"), }) tmpDir := getTestDir(c, "test-cp-to-case-b") defer os.RemoveAll(tmpDir) makeTestContentInDir(c, tmpDir) srcPath := cpPath(tmpDir, "file1") dstDir := containerCpPathTrailingSep(containerID, "testDir") err := runDockerCp(c, srcPath, dstDir, nil) c.Assert(err, checker.NotNil) c.Assert(isCpDirNotExist(err), checker.True, check.Commentf("expected DirNotExists error, but got %T: %s", err, err)) } // C. SRC specifies a file and DST exists as a file. This should overwrite // the file at DST with the contents of the source file. func (s *DockerSuite) TestCpToCaseC(c *check.C) { testRequires(c, DaemonIsLinux) containerID := makeTestContainer(c, testContainerOptions{ addContent: true, workDir: "/root", command: makeCatFileCommand("file2"), }) tmpDir := getTestDir(c, "test-cp-to-case-c") defer os.RemoveAll(tmpDir) makeTestContentInDir(c, tmpDir) srcPath := cpPath(tmpDir, "file1") dstPath := containerCpPath(containerID, "/root/file2") // Ensure the container's file starts with the original content. c.Assert(containerStartOutputEquals(c, containerID, "file2\n"), checker.IsNil) c.Assert(runDockerCp(c, srcPath, dstPath, nil), checker.IsNil) // Should now contain file1's contents. c.Assert(containerStartOutputEquals(c, containerID, "file1\n"), checker.IsNil) } // D. SRC specifies a file and DST exists as a directory. This should place // a copy of the source file inside it using the basename from SRC. Ensure // this works whether DST has a trailing path separator or not. func (s *DockerSuite) TestCpToCaseD(c *check.C) { testRequires(c, DaemonIsLinux) containerID := makeTestContainer(c, testContainerOptions{ addContent: true, command: makeCatFileCommand("/dir1/file1"), }) tmpDir := getTestDir(c, "test-cp-to-case-d") defer os.RemoveAll(tmpDir) makeTestContentInDir(c, tmpDir) srcPath := cpPath(tmpDir, "file1") dstDir := containerCpPath(containerID, "dir1") // Ensure that dstPath doesn't exist. c.Assert(containerStartOutputEquals(c, containerID, ""), checker.IsNil) c.Assert(runDockerCp(c, srcPath, dstDir, nil), checker.IsNil) // Should now contain file1's contents. c.Assert(containerStartOutputEquals(c, containerID, "file1\n"), checker.IsNil) // Now try again but using a trailing path separator for dstDir. // Make new destination container. containerID = makeTestContainer(c, testContainerOptions{ addContent: true, command: makeCatFileCommand("/dir1/file1"), }) dstDir = containerCpPathTrailingSep(containerID, "dir1") // Ensure that dstPath doesn't exist. c.Assert(containerStartOutputEquals(c, containerID, ""), checker.IsNil) c.Assert(runDockerCp(c, srcPath, dstDir, nil), checker.IsNil) // Should now contain file1's contents. c.Assert(containerStartOutputEquals(c, containerID, "file1\n"), checker.IsNil) } // E. SRC specifies a directory and DST does not exist. This should create a // directory at DST and copy the contents of the SRC directory into the DST // directory. Ensure this works whether DST has a trailing path separator or // not. func (s *DockerSuite) TestCpToCaseE(c *check.C) { containerID := makeTestContainer(c, testContainerOptions{ command: makeCatFileCommand("/testDir/file1-1"), }) tmpDir := getTestDir(c, "test-cp-to-case-e") defer os.RemoveAll(tmpDir) makeTestContentInDir(c, tmpDir) srcDir := cpPath(tmpDir, "dir1") dstDir := containerCpPath(containerID, "testDir") c.Assert(runDockerCp(c, srcDir, dstDir, nil), checker.IsNil) // Should now contain file1-1's contents. c.Assert(containerStartOutputEquals(c, containerID, "file1-1\n"), checker.IsNil) // Now try again but using a trailing path separator for dstDir. // Make new destination container. containerID = makeTestContainer(c, testContainerOptions{ command: makeCatFileCommand("/testDir/file1-1"), }) dstDir = containerCpPathTrailingSep(containerID, "testDir") c.Assert(runDockerCp(c, srcDir, dstDir, nil), checker.IsNil) // Should now contain file1-1's contents. c.Assert(containerStartOutputEquals(c, containerID, "file1-1\n"), checker.IsNil) } // F. SRC specifies a directory and DST exists as a file. This should cause an // error as it is not possible to overwrite a file with a directory. func (s *DockerSuite) TestCpToCaseF(c *check.C) { testRequires(c, DaemonIsLinux) containerID := makeTestContainer(c, testContainerOptions{ addContent: true, workDir: "/root", }) tmpDir := getTestDir(c, "test-cp-to-case-f") defer os.RemoveAll(tmpDir) makeTestContentInDir(c, tmpDir) srcDir := cpPath(tmpDir, "dir1") dstFile := containerCpPath(containerID, "/root/file1") err := runDockerCp(c, srcDir, dstFile, nil) c.Assert(err, checker.NotNil) c.Assert(isCpCannotCopyDir(err), checker.True, check.Commentf("expected ErrCannotCopyDir error, but got %T: %s", err, err)) } // G. SRC specifies a directory and DST exists as a directory. This should copy // the SRC directory and all its contents to the DST directory. Ensure this // works whether DST has a trailing path separator or not. func (s *DockerSuite) TestCpToCaseG(c *check.C) { testRequires(c, DaemonIsLinux) containerID := makeTestContainer(c, testContainerOptions{ addContent: true, workDir: "/root", command: makeCatFileCommand("dir2/dir1/file1-1"), }) tmpDir := getTestDir(c, "test-cp-to-case-g") defer os.RemoveAll(tmpDir) makeTestContentInDir(c, tmpDir) srcDir := cpPath(tmpDir, "dir1") dstDir := containerCpPath(containerID, "/root/dir2") // Ensure that dstPath doesn't exist. c.Assert(containerStartOutputEquals(c, containerID, ""), checker.IsNil) c.Assert(runDockerCp(c, srcDir, dstDir, nil), checker.IsNil) // Should now contain file1-1's contents. c.Assert(containerStartOutputEquals(c, containerID, "file1-1\n"), checker.IsNil) // Now try again but using a trailing path separator for dstDir. // Make new destination container. containerID = makeTestContainer(c, testContainerOptions{ addContent: true, command: makeCatFileCommand("/dir2/dir1/file1-1"), }) dstDir = containerCpPathTrailingSep(containerID, "/dir2") // Ensure that dstPath doesn't exist. c.Assert(containerStartOutputEquals(c, containerID, ""), checker.IsNil) c.Assert(runDockerCp(c, srcDir, dstDir, nil), checker.IsNil) // Should now contain file1-1's contents. c.Assert(containerStartOutputEquals(c, containerID, "file1-1\n"), checker.IsNil) } // H. SRC specifies a directory's contents only and DST does not exist. This // should create a directory at DST and copy the contents of the SRC // directory (but not the directory itself) into the DST directory. Ensure // this works whether DST has a trailing path separator or not. func (s *DockerSuite) TestCpToCaseH(c *check.C) { containerID := makeTestContainer(c, testContainerOptions{ command: makeCatFileCommand("/testDir/file1-1"), }) tmpDir := getTestDir(c, "test-cp-to-case-h") defer os.RemoveAll(tmpDir) makeTestContentInDir(c, tmpDir) srcDir := cpPathTrailingSep(tmpDir, "dir1") + "." dstDir := containerCpPath(containerID, "testDir") c.Assert(runDockerCp(c, srcDir, dstDir, nil), checker.IsNil) // Should now contain file1-1's contents. c.Assert(containerStartOutputEquals(c, containerID, "file1-1\n"), checker.IsNil) // Now try again but using a trailing path separator for dstDir. // Make new destination container. containerID = makeTestContainer(c, testContainerOptions{ command: makeCatFileCommand("/testDir/file1-1"), }) dstDir = containerCpPathTrailingSep(containerID, "testDir") c.Assert(runDockerCp(c, srcDir, dstDir, nil), checker.IsNil) // Should now contain file1-1's contents. c.Assert(containerStartOutputEquals(c, containerID, "file1-1\n"), checker.IsNil) } // I. SRC specifies a directory's contents only and DST exists as a file. This // should cause an error as it is not possible to overwrite a file with a // directory. func (s *DockerSuite) TestCpToCaseI(c *check.C) { testRequires(c, DaemonIsLinux) containerID := makeTestContainer(c, testContainerOptions{ addContent: true, workDir: "/root", }) tmpDir := getTestDir(c, "test-cp-to-case-i") defer os.RemoveAll(tmpDir) makeTestContentInDir(c, tmpDir) srcDir := cpPathTrailingSep(tmpDir, "dir1") + "." dstFile := containerCpPath(containerID, "/root/file1") err := runDockerCp(c, srcDir, dstFile, nil) c.Assert(err, checker.NotNil) c.Assert(isCpCannotCopyDir(err), checker.True, check.Commentf("expected ErrCannotCopyDir error, but got %T: %s", err, err)) } // J. SRC specifies a directory's contents only and DST exists as a directory. // This should copy the contents of the SRC directory (but not the directory // itself) into the DST directory. Ensure this works whether DST has a // trailing path separator or not. func (s *DockerSuite) TestCpToCaseJ(c *check.C) { testRequires(c, DaemonIsLinux) containerID := makeTestContainer(c, testContainerOptions{ addContent: true, workDir: "/root", command: makeCatFileCommand("/dir2/file1-1"), }) tmpDir := getTestDir(c, "test-cp-to-case-j") defer os.RemoveAll(tmpDir) makeTestContentInDir(c, tmpDir) srcDir := cpPathTrailingSep(tmpDir, "dir1") + "." dstDir := containerCpPath(containerID, "/dir2") // Ensure that dstPath doesn't exist. c.Assert(containerStartOutputEquals(c, containerID, ""), checker.IsNil) c.Assert(runDockerCp(c, srcDir, dstDir, nil), checker.IsNil) // Should now contain file1-1's contents. c.Assert(containerStartOutputEquals(c, containerID, "file1-1\n"), checker.IsNil) // Now try again but using a trailing path separator for dstDir. // Make new destination container. containerID = makeTestContainer(c, testContainerOptions{ command: makeCatFileCommand("/dir2/file1-1"), }) dstDir = containerCpPathTrailingSep(containerID, "/dir2") // Ensure that dstPath doesn't exist. c.Assert(containerStartOutputEquals(c, containerID, ""), checker.IsNil) c.Assert(runDockerCp(c, srcDir, dstDir, nil), checker.IsNil) // Should now contain file1-1's contents. c.Assert(containerStartOutputEquals(c, containerID, "file1-1\n"), checker.IsNil) } // The `docker cp` command should also ensure that you cannot // write to a container rootfs that is marked as read-only. func (s *DockerSuite) TestCpToErrReadOnlyRootfs(c *check.C) { // --read-only + userns has remount issues testRequires(c, DaemonIsLinux, NotUserNamespace) tmpDir := getTestDir(c, "test-cp-to-err-read-only-rootfs") defer os.RemoveAll(tmpDir) makeTestContentInDir(c, tmpDir) containerID := makeTestContainer(c, testContainerOptions{ readOnly: true, workDir: "/root", command: makeCatFileCommand("shouldNotExist"), }) srcPath := cpPath(tmpDir, "file1") dstPath := containerCpPath(containerID, "/root/shouldNotExist") err := runDockerCp(c, srcPath, dstPath, nil) c.Assert(err, checker.NotNil) c.Assert(isCpCannotCopyReadOnly(err), checker.True, check.Commentf("expected ErrContainerRootfsReadonly error, but got %T: %s", err, err)) // Ensure that dstPath doesn't exist. c.Assert(containerStartOutputEquals(c, containerID, ""), checker.IsNil) } // The `docker cp` command should also ensure that you // cannot write to a volume that is mounted as read-only. func (s *DockerSuite) TestCpToErrReadOnlyVolume(c *check.C) { // --read-only + userns has remount issues testRequires(c, DaemonIsLinux, NotUserNamespace) tmpDir := getTestDir(c, "test-cp-to-err-read-only-volume") defer os.RemoveAll(tmpDir) makeTestContentInDir(c, tmpDir) containerID := makeTestContainer(c, testContainerOptions{ volumes: defaultVolumes(tmpDir), workDir: "/root", command: makeCatFileCommand("/vol_ro/shouldNotExist"), }) srcPath := cpPath(tmpDir, "file1") dstPath := containerCpPath(containerID, "/vol_ro/shouldNotExist") err := runDockerCp(c, srcPath, dstPath, nil) c.Assert(err, checker.NotNil) c.Assert(isCpCannotCopyReadOnly(err), checker.True, check.Commentf("expected ErrVolumeReadonly error, but got %T: %s", err, err)) // Ensure that dstPath doesn't exist. c.Assert(containerStartOutputEquals(c, containerID, ""), checker.IsNil) }