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moby--moby/integration-cli/docker_cli_cp_from_container_test.go

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package main
import (
"os"
"path/filepath"
"github.com/docker/docker/integration-cli/checker"
"github.com/go-check/check"
)
// docker cp CONTAINER:PATH LOCALPATH
// 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.
// First get these easy error cases out of the way.
// Test for error when SRC does not exist.
func (s *DockerSuite) TestCpFromErrSrcNotExists(c *check.C) {
containerID := makeTestContainer(c, testContainerOptions{})
tmpDir := getTestDir(c, "test-cp-from-err-src-not-exists")
defer os.RemoveAll(tmpDir)
err := runDockerCp(c, containerCpPath(containerID, "file1"), tmpDir)
c.Assert(err, checker.NotNil)
c.Assert(isCpNotExist(err), checker.True, check.Commentf("expected IsNotExist error, but got %T: %s", err, err))
}
// Test for error when SRC ends in a trailing
// path separator but it exists as a file.
func (s *DockerSuite) TestCpFromErrSrcNotDir(c *check.C) {
testRequires(c, DaemonIsLinux)
containerID := makeTestContainer(c, testContainerOptions{addContent: true})
tmpDir := getTestDir(c, "test-cp-from-err-src-not-dir")
defer os.RemoveAll(tmpDir)
err := runDockerCp(c, containerCpPathTrailingSep(containerID, "file1"), tmpDir)
c.Assert(err, checker.NotNil)
c.Assert(isCpNotDir(err), checker.True, check.Commentf("expected IsNotDir error, but got %T: %s", err, err))
}
// Test for error when SRC is a valid file or directory,
// bu the DST parent directory does not exist.
func (s *DockerSuite) TestCpFromErrDstParentNotExists(c *check.C) {
testRequires(c, DaemonIsLinux)
containerID := makeTestContainer(c, testContainerOptions{addContent: true})
tmpDir := getTestDir(c, "test-cp-from-err-dst-parent-not-exists")
defer os.RemoveAll(tmpDir)
makeTestContentInDir(c, tmpDir)
// Try with a file source.
srcPath := containerCpPath(containerID, "/file1")
dstPath := cpPath(tmpDir, "notExists", "file1")
err := runDockerCp(c, srcPath, dstPath)
c.Assert(err, checker.NotNil)
c.Assert(isCpNotExist(err), checker.True, check.Commentf("expected IsNotExist error, but got %T: %s", err, err))
// Try with a directory source.
srcPath = containerCpPath(containerID, "/dir1")
err = runDockerCp(c, srcPath, dstPath)
c.Assert(err, checker.NotNil)
c.Assert(isCpNotExist(err), checker.True, check.Commentf("expected IsNotExist error, but got %T: %s", err, err))
}
// Test for error when DST ends in a trailing
// path separator but exists as a file.
func (s *DockerSuite) TestCpFromErrDstNotDir(c *check.C) {
testRequires(c, DaemonIsLinux)
containerID := makeTestContainer(c, testContainerOptions{addContent: true})
tmpDir := getTestDir(c, "test-cp-from-err-dst-not-dir")
defer os.RemoveAll(tmpDir)
makeTestContentInDir(c, tmpDir)
// Try with a file source.
srcPath := containerCpPath(containerID, "/file1")
dstPath := cpPathTrailingSep(tmpDir, "file1")
err := runDockerCp(c, srcPath, dstPath)
c.Assert(err, checker.NotNil)
c.Assert(isCpNotDir(err), checker.True, check.Commentf("expected IsNotDir error, but got %T: %s", err, err))
// Try with a directory source.
srcPath = containerCpPath(containerID, "/dir1")
err = runDockerCp(c, srcPath, dstPath)
c.Assert(err, checker.NotNil)
c.Assert(isCpNotDir(err), checker.True, check.Commentf("expected IsNotDir error, but got %T: %s", err, err))
}
// Check that copying from a container to a local symlink copies to the symlink
// target and does not overwrite the local symlink itself.
func (s *DockerSuite) TestCpFromSymlinkDestination(c *check.C) {
testRequires(c, DaemonIsLinux)
containerID := makeTestContainer(c, testContainerOptions{addContent: true})
tmpDir := getTestDir(c, "test-cp-from-err-dst-not-dir")
defer os.RemoveAll(tmpDir)
makeTestContentInDir(c, tmpDir)
// First, copy a file from the container to a symlink to a file. This
// should overwrite the symlink target contents with the source contents.
srcPath := containerCpPath(containerID, "/file2")
dstPath := cpPath(tmpDir, "symlinkToFile1")
c.Assert(runDockerCp(c, srcPath, dstPath), checker.IsNil)
// The symlink should not have been modified.
c.Assert(symlinkTargetEquals(c, dstPath, "file1"), checker.IsNil)
// The file should have the contents of "file2" now.
c.Assert(fileContentEquals(c, cpPath(tmpDir, "file1"), "file2\n"), checker.IsNil)
// Next, copy a file from the container to a symlink to a directory. This
// should copy the file into the symlink target directory.
dstPath = cpPath(tmpDir, "symlinkToDir1")
c.Assert(runDockerCp(c, srcPath, dstPath), checker.IsNil)
// The symlink should not have been modified.
c.Assert(symlinkTargetEquals(c, dstPath, "dir1"), checker.IsNil)
// The file should have the contents of "file2" now.
c.Assert(fileContentEquals(c, cpPath(tmpDir, "file2"), "file2\n"), checker.IsNil)
// Next, copy a file from the container to a symlink to a file that does
// not exist (a broken symlink). This should create the target file with
// the contents of the source file.
dstPath = cpPath(tmpDir, "brokenSymlinkToFileX")
c.Assert(runDockerCp(c, srcPath, dstPath), checker.IsNil)
// The symlink should not have been modified.
c.Assert(symlinkTargetEquals(c, dstPath, "fileX"), checker.IsNil)
// The file should have the contents of "file2" now.
c.Assert(fileContentEquals(c, cpPath(tmpDir, "fileX"), "file2\n"), checker.IsNil)
// Next, copy a directory from the container to a symlink to a local
// directory. This should copy the directory into the symlink target
// directory and not modify the symlink.
srcPath = containerCpPath(containerID, "/dir2")
dstPath = cpPath(tmpDir, "symlinkToDir1")
c.Assert(runDockerCp(c, srcPath, dstPath), checker.IsNil)
// The symlink should not have been modified.
c.Assert(symlinkTargetEquals(c, dstPath, "dir1"), checker.IsNil)
// The directory should now contain a copy of "dir2".
c.Assert(fileContentEquals(c, cpPath(tmpDir, "dir1/dir2/file2-1"), "file2-1\n"), checker.IsNil)
// Next, copy a directory from the container to a symlink to a local
// directory that does not exist (a broken symlink). This should create
// the target as a directory with the contents of the source directory. It
// should not modify the symlink.
dstPath = cpPath(tmpDir, "brokenSymlinkToDirX")
c.Assert(runDockerCp(c, srcPath, dstPath), checker.IsNil)
// The symlink should not have been modified.
c.Assert(symlinkTargetEquals(c, dstPath, "dirX"), checker.IsNil)
// The "dirX" directory should now be a copy of "dir2".
c.Assert(fileContentEquals(c, cpPath(tmpDir, "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) TestCpFromCaseA(c *check.C) {
testRequires(c, DaemonIsLinux)
containerID := makeTestContainer(c, testContainerOptions{
addContent: true, workDir: "/root",
})
tmpDir := getTestDir(c, "test-cp-from-case-a")
defer os.RemoveAll(tmpDir)
srcPath := containerCpPath(containerID, "/root/file1")
dstPath := cpPath(tmpDir, "itWorks.txt")
c.Assert(runDockerCp(c, srcPath, dstPath), checker.IsNil)
c.Assert(fileContentEquals(c, dstPath, "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) TestCpFromCaseB(c *check.C) {
testRequires(c, DaemonIsLinux)
containerID := makeTestContainer(c, testContainerOptions{addContent: true})
tmpDir := getTestDir(c, "test-cp-from-case-b")
defer os.RemoveAll(tmpDir)
srcPath := containerCpPath(containerID, "/file1")
dstDir := cpPathTrailingSep(tmpDir, "testDir")
err := runDockerCp(c, srcPath, dstDir)
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) TestCpFromCaseC(c *check.C) {
testRequires(c, DaemonIsLinux)
containerID := makeTestContainer(c, testContainerOptions{
addContent: true, workDir: "/root",
})
tmpDir := getTestDir(c, "test-cp-from-case-c")
defer os.RemoveAll(tmpDir)
makeTestContentInDir(c, tmpDir)
srcPath := containerCpPath(containerID, "/root/file1")
dstPath := cpPath(tmpDir, "file2")
// Ensure the local file starts with different content.
c.Assert(fileContentEquals(c, dstPath, "file2\n"), checker.IsNil)
c.Assert(runDockerCp(c, srcPath, dstPath), checker.IsNil)
c.Assert(fileContentEquals(c, dstPath, "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) TestCpFromCaseD(c *check.C) {
testRequires(c, DaemonIsLinux)
containerID := makeTestContainer(c, testContainerOptions{addContent: true})
tmpDir := getTestDir(c, "test-cp-from-case-d")
defer os.RemoveAll(tmpDir)
makeTestContentInDir(c, tmpDir)
srcPath := containerCpPath(containerID, "/file1")
dstDir := cpPath(tmpDir, "dir1")
dstPath := filepath.Join(dstDir, "file1")
// Ensure that dstPath doesn't exist.
_, err := os.Stat(dstPath)
c.Assert(os.IsNotExist(err), checker.True, check.Commentf("did not expect dstPath %q to exist", dstPath))
c.Assert(runDockerCp(c, srcPath, dstDir), checker.IsNil)
c.Assert(fileContentEquals(c, dstPath, "file1\n"), checker.IsNil)
// Now try again but using a trailing path separator for dstDir.
// unable to remove dstDir
c.Assert(os.RemoveAll(dstDir), checker.IsNil)
// unable to make dstDir
c.Assert(os.MkdirAll(dstDir, os.FileMode(0755)), checker.IsNil)
dstDir = cpPathTrailingSep(tmpDir, "dir1")
c.Assert(runDockerCp(c, srcPath, dstDir), checker.IsNil)
c.Assert(fileContentEquals(c, dstPath, "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) TestCpFromCaseE(c *check.C) {
testRequires(c, DaemonIsLinux)
containerID := makeTestContainer(c, testContainerOptions{addContent: true})
tmpDir := getTestDir(c, "test-cp-from-case-e")
defer os.RemoveAll(tmpDir)
srcDir := containerCpPath(containerID, "dir1")
dstDir := cpPath(tmpDir, "testDir")
dstPath := filepath.Join(dstDir, "file1-1")
c.Assert(runDockerCp(c, srcDir, dstDir), checker.IsNil)
c.Assert(fileContentEquals(c, dstPath, "file1-1\n"), checker.IsNil)
// Now try again but using a trailing path separator for dstDir.
// unable to remove dstDir
c.Assert(os.RemoveAll(dstDir), checker.IsNil)
dstDir = cpPathTrailingSep(tmpDir, "testDir")
c.Assert(runDockerCp(c, srcDir, dstDir), checker.IsNil)
c.Assert(fileContentEquals(c, dstPath, "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) TestCpFromCaseF(c *check.C) {
testRequires(c, DaemonIsLinux)
containerID := makeTestContainer(c, testContainerOptions{
addContent: true, workDir: "/root",
})
tmpDir := getTestDir(c, "test-cp-from-case-f")
defer os.RemoveAll(tmpDir)
makeTestContentInDir(c, tmpDir)
srcDir := containerCpPath(containerID, "/root/dir1")
dstFile := cpPath(tmpDir, "file1")
err := runDockerCp(c, srcDir, dstFile)
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) TestCpFromCaseG(c *check.C) {
testRequires(c, DaemonIsLinux)
containerID := makeTestContainer(c, testContainerOptions{
addContent: true, workDir: "/root",
})
tmpDir := getTestDir(c, "test-cp-from-case-g")
defer os.RemoveAll(tmpDir)
makeTestContentInDir(c, tmpDir)
srcDir := containerCpPath(containerID, "/root/dir1")
dstDir := cpPath(tmpDir, "dir2")
resultDir := filepath.Join(dstDir, "dir1")
dstPath := filepath.Join(resultDir, "file1-1")
c.Assert(runDockerCp(c, srcDir, dstDir), checker.IsNil)
c.Assert(fileContentEquals(c, dstPath, "file1-1\n"), checker.IsNil)
// Now try again but using a trailing path separator for dstDir.
// unable to remove dstDir
c.Assert(os.RemoveAll(dstDir), checker.IsNil)
// unable to make dstDir
c.Assert(os.MkdirAll(dstDir, os.FileMode(0755)), checker.IsNil)
dstDir = cpPathTrailingSep(tmpDir, "dir2")
c.Assert(runDockerCp(c, srcDir, dstDir), checker.IsNil)
c.Assert(fileContentEquals(c, dstPath, "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) TestCpFromCaseH(c *check.C) {
testRequires(c, DaemonIsLinux)
containerID := makeTestContainer(c, testContainerOptions{addContent: true})
tmpDir := getTestDir(c, "test-cp-from-case-h")
defer os.RemoveAll(tmpDir)
srcDir := containerCpPathTrailingSep(containerID, "dir1") + "."
dstDir := cpPath(tmpDir, "testDir")
dstPath := filepath.Join(dstDir, "file1-1")
c.Assert(runDockerCp(c, srcDir, dstDir), checker.IsNil)
c.Assert(fileContentEquals(c, dstPath, "file1-1\n"), checker.IsNil)
// Now try again but using a trailing path separator for dstDir.
// unable to remove resultDir
c.Assert(os.RemoveAll(dstDir), checker.IsNil)
dstDir = cpPathTrailingSep(tmpDir, "testDir")
c.Assert(runDockerCp(c, srcDir, dstDir), checker.IsNil)
c.Assert(fileContentEquals(c, dstPath, "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) TestCpFromCaseI(c *check.C) {
testRequires(c, DaemonIsLinux)
containerID := makeTestContainer(c, testContainerOptions{
addContent: true, workDir: "/root",
})
tmpDir := getTestDir(c, "test-cp-from-case-i")
defer os.RemoveAll(tmpDir)
makeTestContentInDir(c, tmpDir)
srcDir := containerCpPathTrailingSep(containerID, "/root/dir1") + "."
dstFile := cpPath(tmpDir, "file1")
err := runDockerCp(c, srcDir, dstFile)
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) TestCpFromCaseJ(c *check.C) {
testRequires(c, DaemonIsLinux)
containerID := makeTestContainer(c, testContainerOptions{
addContent: true, workDir: "/root",
})
tmpDir := getTestDir(c, "test-cp-from-case-j")
defer os.RemoveAll(tmpDir)
makeTestContentInDir(c, tmpDir)
srcDir := containerCpPathTrailingSep(containerID, "/root/dir1") + "."
dstDir := cpPath(tmpDir, "dir2")
dstPath := filepath.Join(dstDir, "file1-1")
c.Assert(runDockerCp(c, srcDir, dstDir), checker.IsNil)
c.Assert(fileContentEquals(c, dstPath, "file1-1\n"), checker.IsNil)
// Now try again but using a trailing path separator for dstDir.
// unable to remove dstDir
c.Assert(os.RemoveAll(dstDir), checker.IsNil)
// unable to make dstDir
c.Assert(os.MkdirAll(dstDir, os.FileMode(0755)), checker.IsNil)
dstDir = cpPathTrailingSep(tmpDir, "dir2")
c.Assert(runDockerCp(c, srcDir, dstDir), checker.IsNil)
c.Assert(fileContentEquals(c, dstPath, "file1-1\n"), checker.IsNil)
}