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Merge pull request #16613 from WeiZhang555/docker-cp-symlink

Browse source 
Add option `-L` to allow `docker cp` follow symbol link
This commit is contained in:
Antonio Murdaca 2015-11-21 17:03:24 +01:00
commit 3ff9bb5332
7 changed files with 644 additions and 142 deletions
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60
api/client/cp.go
View file

@ -26,22 +26,26 @@ const (
acrossContainers = fromContainer | toContainer
)
type cpConfig struct {
followLink bool
}
// CmdCp copies files/folders to or from a path in a container.
//
// When copying from a container, if LOCALPATH is '-' the data is written as a
// When copying from a container, if DEST_PATH is '-' the data is written as a
// tar archive file to STDOUT.
//
// When copying to a container, if LOCALPATH is '-' the data is read as a tar
// archive file from STDIN, and the destination CONTAINER:PATH, must specify
// When copying to a container, if SRC_PATH is '-' the data is read as a tar
// archive file from STDIN, and the destination CONTAINER:DEST_PATH, must specify
// a directory.
//
// Usage:
// docker cp CONTAINER:PATH LOCALPATH|-
// docker cp LOCALPATH|- CONTAINER:PATH
// docker cp CONTAINER:SRC_PATH DEST_PATH|-
// docker cp SRC_PATH|- CONTAINER:DEST_PATH
func (cli *DockerCli) CmdCp(args ...string) error {
cmd := Cli.Subcmd(
"cp",
[]string{"CONTAINER:PATH LOCALPATH|-", "LOCALPATH|- CONTAINER:PATH"},
[]string{"CONTAINER:SRC_PATH DEST_PATH|-", "SRC_PATH|- CONTAINER:DEST_PATH"},
strings.Join([]string{
Cli.DockerCommands["cp"].Description,
"\nUse '-' as the source to read a tar archive from stdin\n",
@ -52,6 +56,8 @@ func (cli *DockerCli) CmdCp(args ...string) error {
true,
)
followLink := cmd.Bool([]string{"L", "-follow-link"}, false, "Always follow symbol link in SRC_PATH")
cmd.Require(flag.Exact, 2)
cmd.ParseFlags(args, true)
@ -73,11 +79,15 @@ func (cli *DockerCli) CmdCp(args ...string) error {
direction |= toContainer
}
cpParam := &cpConfig{
followLink: *followLink,
}
switch direction {
case fromContainer:
return cli.copyFromContainer(srcContainer, srcPath, dstPath)
return cli.copyFromContainer(srcContainer, srcPath, dstPath, cpParam)
case toContainer:
return cli.copyToContainer(srcPath, dstContainer, dstPath)
return cli.copyToContainer(srcPath, dstContainer, dstPath, cpParam)
case acrossContainers:
// Copying between containers isn't supported.
return fmt.Errorf("copying between containers is not supported")
@ -161,7 +171,7 @@ func resolveLocalPath(localPath string) (absPath string, err error) {
return archive.PreserveTrailingDotOrSeparator(absPath, localPath), nil
}
func (cli *DockerCli) copyFromContainer(srcContainer, srcPath, dstPath string) (err error) {
func (cli *DockerCli) copyFromContainer(srcContainer, srcPath, dstPath string, cpParam *cpConfig) (err error) {
if dstPath != "-" {
// Get an absolute destination path.
dstPath, err = resolveLocalPath(dstPath)
@ -170,6 +180,26 @@ func (cli *DockerCli) copyFromContainer(srcContainer, srcPath, dstPath string) (
}
}
// if client requests to follow symbol link, then must decide target file to be copied
var rebaseName string
if cpParam.followLink {
srcStat, err := cli.statContainerPath(srcContainer, srcPath)
// If the destination is a symbolic link, we should follow it.
if err == nil && srcStat.Mode&os.ModeSymlink != 0 {
linkTarget := srcStat.LinkTarget
if !system.IsAbs(linkTarget) {
// Join with the parent directory.
srcParent, _ := archive.SplitPathDirEntry(srcPath)
linkTarget = filepath.Join(srcParent, linkTarget)
}
linkTarget, rebaseName = archive.GetRebaseName(srcPath, linkTarget)
srcPath = linkTarget
}
}
query := make(url.Values, 1)
query.Set("path", filepath.ToSlash(srcPath)) // Normalize the paths used in the API.
@ -208,15 +238,21 @@ func (cli *DockerCli) copyFromContainer(srcContainer, srcPath, dstPath string) (
Path: srcPath,
Exists: true,
IsDir: stat.Mode.IsDir(),
RebaseName: rebaseName,
}
preArchive := response.body
if len(srcInfo.RebaseName) != 0 {
_, srcBase := archive.SplitPathDirEntry(srcInfo.Path)
preArchive = archive.RebaseArchiveEntries(response.body, srcBase, srcInfo.RebaseName)
}
// See comments in the implementation of `archive.CopyTo` for exactly what
// goes into deciding how and whether the source archive needs to be
// altered for the correct copy behavior.
return archive.CopyTo(response.body, srcInfo, dstPath)
return archive.CopyTo(preArchive, srcInfo, dstPath)
}
func (cli *DockerCli) copyToContainer(srcPath, dstContainer, dstPath string) (err error) {
func (cli *DockerCli) copyToContainer(srcPath, dstContainer, dstPath string, cpParam *cpConfig) (err error) {
if srcPath != "-" {
// Get an absolute source path.
srcPath, err = resolveLocalPath(srcPath)
@ -271,7 +307,7 @@ func (cli *DockerCli) copyToContainer(srcPath, dstContainer, dstPath string) (er
}
} else {
// Prepare source copy info.
srcInfo, err := archive.CopyInfoSourcePath(srcPath)
srcInfo, err := archive.CopyInfoSourcePath(srcPath, cpParam.followLink)
if err != nil {
return err
}

90
docs/reference/commandline/cp.md
View file

@ -10,81 +10,79 @@ parent = "smn_cli"
# cp
Usage: docker cp [OPTIONS] CONTAINER:PATH LOCALPATH|-
docker cp [OPTIONS] LOCALPATH|- CONTAINER:PATH
Usage: docker cp [OPTIONS] CONTAINER:SRC_PATH DEST_PATH | -
docker cp [OPTIONS] SRC_PATH | - CONTAINER:DEST_PATH
Copy files/folders between a container and the local filesystem
-L, --follow-link=false Always follow symbol link in SRC_PATH
--help=false Print usage
In the first synopsis form, the `docker cp` utility copies the contents of
`PATH` from the filesystem of `CONTAINER` to the `LOCALPATH` (or stream as
a tar archive to `STDOUT` if `-` is specified).
The `docker cp` utility copies the contents of `SRC_PATH` to the `DEST_PATH`.
You can copy from the container's file system to the local machine or the
reverse, from the local filesystem to the container. If `-` is specified for
either the `SRC_PATH` or `DEST_PATH`, you can also stream a tar archive from
`STDIN` or to `STDOUT`. The `CONTAINER` can be a running or stopped container.
The `SRC_PATH` or `DEST_PATH` be a file or directory.
In the second synopsis form, the contents of `LOCALPATH` (or a tar archive
streamed from `STDIN` if `-` is specified) are copied from the local machine to
`PATH` in the filesystem of `CONTAINER`.
The `docker cp` command assumes container paths are relative to the container's
`/` (root) directory. This means supplying the initial forward slash is optional;
The command sees `compassionate_darwin:/tmp/foo/myfile.txt` and
`compassionate_darwin:tmp/foo/myfile.txt` as identical. Local machine paths can
be an absolute or relative value. The command interprets a local machine's
relative paths as relative to the current working directory where `docker cp` is
run.
You can copy to or from either a running or stopped container. The `PATH` can
be a file or directory. The `docker cp` command assumes all `CONTAINER:PATH`
values are relative to the `/` (root) directory of the container. This means
supplying the initial forward slash is optional; The command sees
`compassionate_darwin:/tmp/foo/myfile.txt` and
`compassionate_darwin:tmp/foo/myfile.txt` as identical. If a `LOCALPATH` value
is not absolute, is it considered relative to the current working directory.
Behavior is similar to the common Unix utility `cp -a` in that directories are
The `cp` command behaves like the Unix `cp -a` command in that directories are
copied recursively with permissions preserved if possible. Ownership is set to
the user and primary group on the receiving end of the transfer. For example,
files copied to a container will be created with `UID:GID` of the root user.
Files copied to the local machine will be created with the `UID:GID` of the
user which invoked the `docker cp` command.
the user and primary group at the destination. For example, files copied to a
container are created with `UID:GID` of the root user. Files copied to the local
machine are created with the `UID:GID` of the user which invoked the `docker cp`
command. If you specify the `-L` option, `docker cp` follows any symbolic link
in the `SRC_PATH`.
Assuming a path separator of `/`, a first argument of `SRC_PATH` and second
argument of `DST_PATH`, the behavior is as follows:
argument of `DEST_PATH`, the behavior is as follows:
- `SRC_PATH` specifies a file
- `DST_PATH` does not exist
- the file is saved to a file created at `DST_PATH`
- `DST_PATH` does not exist and ends with `/`
- `DEST_PATH` does not exist
- the file is saved to a file created at `DEST_PATH`
- `DEST_PATH` does not exist and ends with `/`
- Error condition: the destination directory must exist.
- `DST_PATH` exists and is a file
- the destination is overwritten with the contents of the source file
- `DST_PATH` exists and is a directory
- `DEST_PATH` exists and is a file
- the destination is overwritten with the source file's contents
- `DEST_PATH` exists and is a directory
- the file is copied into this directory using the basename from
`SRC_PATH`
- `SRC_PATH` specifies a directory
- `DST_PATH` does not exist
- `DST_PATH` is created as a directory and the *contents* of the source
- `DEST_PATH` does not exist
- `DEST_PATH` is created as a directory and the *contents* of the source
directory are copied into this directory
- `DST_PATH` exists and is a file
- `DEST_PATH` exists and is a file
- Error condition: cannot copy a directory to a file
- `DST_PATH` exists and is a directory
- `DEST_PATH` exists and is a directory
- `SRC_PATH` does not end with `/.`
- the source directory is copied into this directory
- `SRC_PATH` does end with `/.`
- the *content* of the source directory is copied into this
directory
The command requires `SRC_PATH` and `DST_PATH` to exist according to the above
The command requires `SRC_PATH` and `DEST_PATH` to exist according to the above
rules. If `SRC_PATH` is local and is a symbolic link, the symbolic link, not
the target, is copied.
the target, is copied by default. To copy the link target and not the link, specify
the `-L` option.
A colon (`:`) is used as a delimiter between `CONTAINER` and `PATH`, but `:`
could also be in a valid `LOCALPATH`, like `file:name.txt`. This ambiguity is
resolved by requiring a `LOCALPATH` with a `:` to be made explicit with a
relative or absolute path, for example:
A colon (`:`) is used as a delimiter between `CONTAINER` and its path. You can
also use `:` when specifying paths to a `SRC_PATH` or `DEST_PATH` on a local
machine, for example `file:name.txt`. If you use a `:` in a local machine path,
you must be explicit with a relative or absolute path, for example:
`/path/to/file:name.txt` or `./file:name.txt`
It is not possible to copy certain system files such as resources under
`/proc`, `/sys`, `/dev`, and mounts created by the user in the container.
Using `-` as the first argument in place of a `LOCALPATH` will stream the
contents of `STDIN` as a tar archive which will be extracted to the `PATH` in
the filesystem of the destination container. In this case, `PATH` must specify
a directory.
Using `-` as the second argument in place of a `LOCALPATH` will stream the
contents of the resource from the source container as a tar archive to
`STDOUT`.
Using `-` as the `SRC_PATH` streams the contents of `STDIN` as a tar archive.
The command extracts the content of the tar to the `DEST_PATH` in container's
filesystem. In this case, `DEST_PATH` must specify a directory. Using `-` as
`DEST_PATH` streams the contents of the resource as a tar archive to `STDOUT`.

54
integration-cli/docker_cli_cp_test.go
View file

@ -609,3 +609,57 @@ func (s *DockerSuite) TestCopyCreatedContainer(c *check.C) {
defer os.RemoveAll(tmpDir)
dockerCmd(c, "cp", "test_cp:/bin/sh", tmpDir)
}
// test copy with option `-L`: following symbol link
// Check that symlinks to a file behave as expected when copying one from
// a container to host following symbol link
func (s *DockerSuite) TestCpSymlinkFromConToHostFollowSymlink(c *check.C) {
testRequires(c, DaemonIsLinux)
out, exitCode := dockerCmd(c, "run", "-d", "busybox", "/bin/sh", "-c", "mkdir -p '"+cpTestPath+"' && echo -n '"+cpContainerContents+"' > "+cpFullPath+" && ln -s "+cpFullPath+" /dir_link")
if exitCode != 0 {
c.Fatal("failed to create a container", out)
}
cleanedContainerID := strings.TrimSpace(out)
out, _ = dockerCmd(c, "wait", cleanedContainerID)
if strings.TrimSpace(out) != "0" {
c.Fatal("failed to set up container", out)
}
testDir, err := ioutil.TempDir("", "test-cp-symlink-container-to-host-follow-symlink")
if err != nil {
c.Fatal(err)
}
defer os.RemoveAll(testDir)
// This copy command should copy the symlink, not the target, into the
// temporary directory.
dockerCmd(c, "cp", "-L", cleanedContainerID+":"+"/dir_link", testDir)
expectedPath := filepath.Join(testDir, "dir_link")
expected := []byte(cpContainerContents)
actual, err := ioutil.ReadFile(expectedPath)
if !bytes.Equal(actual, expected) {
c.Fatalf("Expected copied file to be duplicate of the container symbol link target")
}
os.Remove(expectedPath)
// now test copy symbol link to an non-existing file in host
expectedPath = filepath.Join(testDir, "somefile_host")
// expectedPath shouldn't exist, if exists, remove it
if _, err := os.Lstat(expectedPath); err == nil {
os.Remove(expectedPath)
}
dockerCmd(c, "cp", "-L", cleanedContainerID+":"+"/dir_link", expectedPath)
actual, err = ioutil.ReadFile(expectedPath)
if !bytes.Equal(actual, expected) {
c.Fatalf("Expected copied file to be duplicate of the container symbol link target")
}
defer os.Remove(expectedPath)
}

103
man/docker-cp.1.md
View file

@ -7,87 +7,87 @@ docker-cp - Copy files/folders between a container and the local filesystem.
# SYNOPSIS
**docker cp**
[**--help**]
CONTAINER:PATH LOCALPATH|-
CONTAINER:SRC_PATH DEST_PATH|-
**docker cp**
[**--help**]
LOCALPATH|- CONTAINER:PATH
SRC_PATH|- CONTAINER:DEST_PATH
# DESCRIPTION
In the first synopsis form, the `docker cp` utility copies the contents of
`PATH` from the filesystem of `CONTAINER` to the `LOCALPATH` (or stream as
a tar archive to `STDOUT` if `-` is specified).
The `docker cp` utility copies the contents of `SRC_PATH` to the `DEST_PATH`.
You can copy from the container's file system to the local machine or the
reverse, from the local filesystem to the container. If `-` is specified for
either the `SRC_PATH` or `DEST_PATH`, you can also stream a tar archive from
`STDIN` or to `STDOUT`. The `CONTAINER` can be a running or stopped container.
The `SRC_PATH` or `DEST_PATH` be a file or directory.
In the second synopsis form, the contents of `LOCALPATH` (or a tar archive
streamed from `STDIN` if `-` is specified) are copied from the local machine to
`PATH` in the filesystem of `CONTAINER`.
The `docker cp` command assumes container paths are relative to the container's
`/` (root) directory. This means supplying the initial forward slash is optional;
The command sees `compassionate_darwin:/tmp/foo/myfile.txt` and
`compassionate_darwin:tmp/foo/myfile.txt` as identical. Local machine paths can
be an absolute or relative value. The command interprets a local machine's
relative paths as relative to the current working directory where `docker cp` is
run.
You can copy to or from either a running or stopped container. The `PATH` can
be a file or directory. The `docker cp` command assumes all `CONTAINER:PATH`
values are relative to the `/` (root) directory of the container. This means
supplying the initial forward slash is optional; The command sees
`compassionate_darwin:/tmp/foo/myfile.txt` and
`compassionate_darwin:tmp/foo/myfile.txt` as identical. If a `LOCALPATH` value
is not absolute, is it considered relative to the current working directory.
Behavior is similar to the common Unix utility `cp -a` in that directories are
The `cp` command behaves like the Unix `cp -a` command in that directories are
copied recursively with permissions preserved if possible. Ownership is set to
the user and primary group on the receiving end of the transfer. For example,
files copied to a container will be created with `UID:GID` of the root user.
Files copied to the local machine will be created with the `UID:GID` of the
user which invoked the `docker cp` command.
the user and primary group at the destination. For example, files copied to a
container are created with `UID:GID` of the root user. Files copied to the local
machine are created with the `UID:GID` of the user which invoked the `docker cp`
command. If you specify the `-L` option, `docker cp` follows any symbolic link
in the `SRC_PATH`.
Assuming a path separator of `/`, a first argument of `SRC_PATH` and second
argument of `DST_PATH`, the behavior is as follows:
argument of `DEST_PATH`, the behavior is as follows:
- `SRC_PATH` specifies a file
- `DST_PATH` does not exist
- the file is saved to a file created at `DST_PATH`
- `DST_PATH` does not exist and ends with `/`
- `DEST_PATH` does not exist
- the file is saved to a file created at `DEST_PATH`
- `DEST_PATH` does not exist and ends with `/`
- Error condition: the destination directory must exist.
- `DST_PATH` exists and is a file
- the destination is overwritten with the contents of the source file
- `DST_PATH` exists and is a directory
- `DEST_PATH` exists and is a file
- the destination is overwritten with the source file's contents
- `DEST_PATH` exists and is a directory
- the file is copied into this directory using the basename from
`SRC_PATH`
- `SRC_PATH` specifies a directory
- `DST_PATH` does not exist
- `DST_PATH` is created as a directory and the *contents* of the source
- `DEST_PATH` does not exist
- `DEST_PATH` is created as a directory and the *contents* of the source
directory are copied into this directory
- `DST_PATH` exists and is a file
- `DEST_PATH` exists and is a file
- Error condition: cannot copy a directory to a file
- `DST_PATH` exists and is a directory
- `DEST_PATH` exists and is a directory
- `SRC_PATH` does not end with `/.`
- the source directory is copied into this directory
- `SRC_PATH` does end with `/.`
- the *content* of the source directory is copied into this
directory
The command requires `SRC_PATH` and `DST_PATH` to exist according to the above
The command requires `SRC_PATH` and `DEST_PATH` to exist according to the above
rules. If `SRC_PATH` is local and is a symbolic link, the symbolic link, not
the target, is copied.
the target, is copied by default. To copy the link target and not the link,
specify the `-L` option.
A colon (`:`) is used as a delimiter between `CONTAINER` and `PATH`, but `:`
could also be in a valid `LOCALPATH`, like `file:name.txt`. This ambiguity is
resolved by requiring a `LOCALPATH` with a `:` to be made explicit with a
relative or absolute path, for example:
A colon (`:`) is used as a delimiter between `CONTAINER` and its path. You can
also use `:` when specifying paths to a `SRC_PATH` or `DEST_PATH` on a local
machine, for example `file:name.txt`. If you use a `:` in a local machine path,
you must be explicit with a relative or absolute path, for example:
`/path/to/file:name.txt` or `./file:name.txt`
It is not possible to copy certain system files such as resources under
`/proc`, `/sys`, `/dev`, and mounts created by the user in the container.
Using `-` as the first argument in place of a `LOCALPATH` will stream the
contents of `STDIN` as a tar archive which will be extracted to the `PATH` in
the filesystem of the destination container. In this case, `PATH` must specify
a directory.
Using `-` as the second argument in place of a `LOCALPATH` will stream the
contents of the resource from the source container as a tar archive to
`STDOUT`.
Using `-` as the `SRC_PATH` streams the contents of `STDIN` as a tar archive.
The command extracts the content of the tar to the `DEST_PATH` in container's
filesystem. In this case, `DEST_PATH` must specify a directory. Using `-` as
`DEST_PATH` streams the contents of the resource as a tar archive to `STDOUT`.
# OPTIONS
**-L**, **--follow-link**=*true*|*false*
Follow symbol link in SRC_PATH
**--help**
Print usage statement
@ -147,6 +147,17 @@ to a directory `/etc/my-app.d` in a container:
The above command will copy the contents of the local `/config` directory into
the directory `/etc/my-app.d` in the container.
Finally, if you want to copy a symbolic link into a container, you typically
want to copy the linked target and not the link itself. To copy the target, use
the `-L` option, for example:
$ ln -s /tmp/somefile /tmp/somefile.ln
$ docker cp -L /tmp/somefile.ln myappcontainer:/tmp/
This command copies content of the local `/tmp/somefile` into the file
`/tmp/somefile.ln` in the container. Without `-L` option, the `/tmp/somefile.ln`
preserves its symbolic link but not its content.
# HISTORY
April 2014, Originally compiled by William Henry (whenry at redhat dot com)
based on docker.com source material and internal work.

3
pkg/archive/changes_test.go
View file

@ -63,6 +63,9 @@ func createSampleDir(t *testing.T, root string) {
{Regular, "dir4/file3-2", "file4-2\n", 0666},
{Symlink, "symlink1", "target1", 0666},
{Symlink, "symlink2", "target2", 0666},
{Symlink, "symlink3", root + "/file1", 0666},
{Symlink, "symlink4", root + "/symlink3", 0666},
{Symlink, "dirSymlink", root + "/dir1", 0740},
}
now := time.Now()

101
pkg/archive/copy.go
View file

@ -135,30 +135,17 @@ type CopyInfo struct {
// operation. The given path should be an absolute local path. A source path
// has all symlinks evaluated that appear before the last path separator ("/"
// on Unix). As it is to be a copy source, the path must exist.
func CopyInfoSourcePath(path string) (CopyInfo, error) {
// Split the given path into its Directory and Base components. We will
// evaluate symlinks in the directory component then append the base.
func CopyInfoSourcePath(path string, followLink bool) (CopyInfo, error) {
// normalize the file path and then evaluate the symbol link
// we will use the target file instead of the symbol link if
// followLink is set
path = normalizePath(path)
dirPath, basePath := filepath.Split(path)
resolvedDirPath, err := filepath.EvalSymlinks(dirPath)
resolvedPath, rebaseName, err := ResolveHostSourcePath(path, followLink)
if err != nil {
return CopyInfo{}, err
}
// resolvedDirPath will have been cleaned (no trailing path separators) so
// we can manually join it with the base path element.
resolvedPath := resolvedDirPath + string(filepath.Separator) + basePath
var rebaseName string
if hasTrailingPathSeparator(path) && filepath.Base(path) != filepath.Base(resolvedPath) {
// In the case where the path had a trailing separator and a symlink
// evaluation has changed the last path component, we will need to
// rebase the name in the archive that is being copied to match the
// originally requested name.
rebaseName = filepath.Base(path)
}
stat, err := os.Lstat(resolvedPath)
if err != nil {
return CopyInfo{}, err
@ -279,7 +266,10 @@ func PrepareArchiveCopy(srcContent Reader, srcInfo, dstInfo CopyInfo) (dstDir st
// The destination exists as some type of file and the source content
// is also a file. The source content entry will have to be renamed to
// have a basename which matches the destination path's basename.
return dstDir, rebaseArchiveEntries(srcContent, srcBase, dstBase), nil
if len(srcInfo.RebaseName) != 0 {
srcBase = srcInfo.RebaseName
}
return dstDir, RebaseArchiveEntries(srcContent, srcBase, dstBase), nil
case srcInfo.IsDir:
// The destination does not exist and the source content is an archive
// of a directory. The archive should be extracted to the parent of
@ -287,7 +277,10 @@ func PrepareArchiveCopy(srcContent Reader, srcInfo, dstInfo CopyInfo) (dstDir st
// created as a result should take the name of the destination path.
// The source content entries will have to be renamed to have a
// basename which matches the destination path's basename.
return dstDir, rebaseArchiveEntries(srcContent, srcBase, dstBase), nil
if len(srcInfo.RebaseName) != 0 {
srcBase = srcInfo.RebaseName
}
return dstDir, RebaseArchiveEntries(srcContent, srcBase, dstBase), nil
case assertsDirectory(dstInfo.Path):
// The destination does not exist and is asserted to be created as a
// directory, but the source content is not a directory. This is an
@ -301,14 +294,17 @@ func PrepareArchiveCopy(srcContent Reader, srcInfo, dstInfo CopyInfo) (dstDir st
// to be created when the archive is extracted and the source content
// entry will have to be renamed to have a basename which matches the
// destination path's basename.
return dstDir, rebaseArchiveEntries(srcContent, srcBase, dstBase), nil
if len(srcInfo.RebaseName) != 0 {
srcBase = srcInfo.RebaseName
}
return dstDir, RebaseArchiveEntries(srcContent, srcBase, dstBase), nil
}
}
// rebaseArchiveEntries rewrites the given srcContent archive replacing
// RebaseArchiveEntries rewrites the given srcContent archive replacing
// an occurrence of oldBase with newBase at the beginning of entry names.
func rebaseArchiveEntries(srcContent Reader, oldBase, newBase string) Archive {
func RebaseArchiveEntries(srcContent Reader, oldBase, newBase string) Archive {
if oldBase == string(os.PathSeparator) {
// If oldBase specifies the root directory, use an empty string as
// oldBase instead so that newBase doesn't replace the path separator
@ -355,7 +351,7 @@ func rebaseArchiveEntries(srcContent Reader, oldBase, newBase string) Archive {
// CopyResource performs an archive copy from the given source path to the
// given destination path. The source path MUST exist and the destination
// path's parent directory must exist.
func CopyResource(srcPath, dstPath string) error {
func CopyResource(srcPath, dstPath string, followLink bool) error {
var (
srcInfo CopyInfo
err error
@ -369,7 +365,7 @@ func CopyResource(srcPath, dstPath string) error {
srcPath = PreserveTrailingDotOrSeparator(filepath.Clean(srcPath), srcPath)
dstPath = PreserveTrailingDotOrSeparator(filepath.Clean(dstPath), dstPath)
if srcInfo, err = CopyInfoSourcePath(srcPath); err != nil {
if srcInfo, err = CopyInfoSourcePath(srcPath, followLink); err != nil {
return err
}
@ -405,3 +401,58 @@ func CopyTo(content Reader, srcInfo CopyInfo, dstPath string) error {
return Untar(copyArchive, dstDir, options)
}
// ResolveHostSourcePath decides real path need to be copied with parameters such as
// whether to follow symbol link or not, if followLink is true, resolvedPath will return
// link target of any symbol link file, else it will only resolve symlink of directory
// but return symbol link file itself without resolving.
func ResolveHostSourcePath(path string, followLink bool) (resolvedPath, rebaseName string, err error) {
if followLink {
resolvedPath, err = filepath.EvalSymlinks(path)
if err != nil {
return
}
resolvedPath, rebaseName = GetRebaseName(path, resolvedPath)
} else {
dirPath, basePath := filepath.Split(path)
// if not follow symbol link, then resolve symbol link of parent dir
var resolvedDirPath string
resolvedDirPath, err = filepath.EvalSymlinks(dirPath)
if err != nil {
return
}
// resolvedDirPath will have been cleaned (no trailing path separators) so
// we can manually join it with the base path element.
resolvedPath = resolvedDirPath + string(filepath.Separator) + basePath
if hasTrailingPathSeparator(path) && filepath.Base(path) != filepath.Base(resolvedPath) {
rebaseName = filepath.Base(path)
}
}
return resolvedPath, rebaseName, nil
}
// GetRebaseName normalizes and compares path and resolvedPath,
// return completed resolved path and rebased file name
func GetRebaseName(path, resolvedPath string) (string, string) {
// linkTarget will have been cleaned (no trailing path separators and dot) so
// we can manually join it with them
var rebaseName string
if specifiesCurrentDir(path) && !specifiesCurrentDir(resolvedPath) {
resolvedPath += string(filepath.Separator) + "."
}
if hasTrailingPathSeparator(path) && !hasTrailingPathSeparator(resolvedPath) {
resolvedPath += string(filepath.Separator)
}
if filepath.Base(path) != filepath.Base(resolvedPath) {
// In the case where the path had a trailing separator and a symlink
// evaluation has changed the last path component, we will need to
// rebase the name in the archive that is being copied to match the
// originally requested name.
rebaseName = filepath.Base(path)
}
return resolvedPath, rebaseName
}

357
pkg/archive/copy_test.go
View file

@ -120,9 +120,15 @@ func logDirContents(t *testing.T, dirPath string) {
}
func testCopyHelper(t *testing.T, srcPath, dstPath string) (err error) {
t.Logf("copying from %q to %q", srcPath, dstPath)
t.Logf("copying from %q to %q (not follow symbol link)", srcPath, dstPath)
return CopyResource(srcPath, dstPath)
return CopyResource(srcPath, dstPath, false)
}
func testCopyHelperFSym(t *testing.T, srcPath, dstPath string) (err error) {
t.Logf("copying from %q to %q (follow symbol link)", srcPath, dstPath)
return CopyResource(srcPath, dstPath, true)
}
// Basic assumptions about SRC and DST:
@ -138,7 +144,7 @@ func TestCopyErrSrcNotExists(t *testing.T) {
tmpDirA, tmpDirB := getTestTempDirs(t)
defer removeAllPaths(tmpDirA, tmpDirB)
if _, err := CopyInfoSourcePath(filepath.Join(tmpDirA, "file1")); !os.IsNotExist(err) {
if _, err := CopyInfoSourcePath(filepath.Join(tmpDirA, "file1"), false); !os.IsNotExist(err) {
t.Fatalf("expected IsNotExist error, but got %T: %s", err, err)
}
}
@ -152,7 +158,7 @@ func TestCopyErrSrcNotDir(t *testing.T) {
// Load A with some sample files and directories.
createSampleDir(t, tmpDirA)
if _, err := CopyInfoSourcePath(joinTrailingSep(tmpDirA, "file1")); !isNotDir(err) {
if _, err := CopyInfoSourcePath(joinTrailingSep(tmpDirA, "file1"), false); !isNotDir(err) {
t.Fatalf("expected IsNotDir error, but got %T: %s", err, err)
}
}
@ -286,6 +292,27 @@ func TestCopyCaseA(t *testing.T) {
if err = fileContentsEqual(t, srcPath, dstPath); err != nil {
t.Fatal(err)
}
os.Remove(dstPath)
symlinkPath := filepath.Join(tmpDirA, "symlink3")
symlinkPath1 := filepath.Join(tmpDirA, "symlink4")
linkTarget := filepath.Join(tmpDirA, "file1")
if err = testCopyHelperFSym(t, symlinkPath, dstPath); err != nil {
t.Fatalf("unexpected error %T: %s", err, err)
}
if err = fileContentsEqual(t, linkTarget, dstPath); err != nil {
t.Fatal(err)
}
os.Remove(dstPath)
if err = testCopyHelperFSym(t, symlinkPath1, dstPath); err != nil {
t.Fatalf("unexpected error %T: %s", err, err)
}
if err = fileContentsEqual(t, linkTarget, dstPath); err != nil {
t.Fatal(err)
}
}
// B. SRC specifies a file and DST (with trailing path separator) doesn't
@ -310,6 +337,16 @@ func TestCopyCaseB(t *testing.T) {
if err != ErrDirNotExists {
t.Fatalf("expected ErrDirNotExists error, but got %T: %s", err, err)
}
symlinkPath := filepath.Join(tmpDirA, "symlink3")
if err = testCopyHelperFSym(t, symlinkPath, dstDir); err == nil {
t.Fatal("expected ErrDirNotExists error, but got nil instead")
}
if err != ErrDirNotExists {
t.Fatalf("expected ErrDirNotExists error, but got %T: %s", err, err)
}
}
// C. SRC specifies a file and DST exists as a file. This should overwrite
@ -341,6 +378,44 @@ func TestCopyCaseC(t *testing.T) {
}
}
// C. Symbol link following version:
// 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 TestCopyCaseCFSym(t *testing.T) {
tmpDirA, tmpDirB := getTestTempDirs(t)
defer removeAllPaths(tmpDirA, tmpDirB)
// Load A and B with some sample files and directories.
createSampleDir(t, tmpDirA)
createSampleDir(t, tmpDirB)
symlinkPathBad := filepath.Join(tmpDirA, "symlink1")
symlinkPath := filepath.Join(tmpDirA, "symlink3")
linkTarget := filepath.Join(tmpDirA, "file1")
dstPath := filepath.Join(tmpDirB, "file2")
var err error
// first to test broken link
if err = testCopyHelperFSym(t, symlinkPathBad, dstPath); err == nil {
t.Fatalf("unexpected error %T: %s", err, err)
}
// test symbol link -> symbol link -> target
// Ensure they start out different.
if err = fileContentsEqual(t, linkTarget, dstPath); err == nil {
t.Fatal("expected different file contents")
}
if err = testCopyHelperFSym(t, symlinkPath, dstPath); err != nil {
t.Fatalf("unexpected error %T: %s", err, err)
}
if err = fileContentsEqual(t, linkTarget, dstPath); err != nil {
t.Fatal(err)
}
}
// 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.
@ -392,6 +467,59 @@ func TestCopyCaseD(t *testing.T) {
}
}
// D. Symbol link following version:
// 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 TestCopyCaseDFSym(t *testing.T) {
tmpDirA, tmpDirB := getTestTempDirs(t)
defer removeAllPaths(tmpDirA, tmpDirB)
// Load A and B with some sample files and directories.
createSampleDir(t, tmpDirA)
createSampleDir(t, tmpDirB)
srcPath := filepath.Join(tmpDirA, "symlink4")
linkTarget := filepath.Join(tmpDirA, "file1")
dstDir := filepath.Join(tmpDirB, "dir1")
dstPath := filepath.Join(dstDir, "symlink4")
var err error
// Ensure that dstPath doesn't exist.
if _, err = os.Stat(dstPath); !os.IsNotExist(err) {
t.Fatalf("did not expect dstPath %q to exist", dstPath)
}
if err = testCopyHelperFSym(t, srcPath, dstDir); err != nil {
t.Fatalf("unexpected error %T: %s", err, err)
}
if err = fileContentsEqual(t, linkTarget, dstPath); err != nil {
t.Fatal(err)
}
// Now try again but using a trailing path separator for dstDir.
if err = os.RemoveAll(dstDir); err != nil {
t.Fatalf("unable to remove dstDir: %s", err)
}
if err = os.MkdirAll(dstDir, os.FileMode(0755)); err != nil {
t.Fatalf("unable to make dstDir: %s", err)
}
dstDir = joinTrailingSep(tmpDirB, "dir1")
if err = testCopyHelperFSym(t, srcPath, dstDir); err != nil {
t.Fatalf("unexpected error %T: %s", err, err)
}
if err = fileContentsEqual(t, linkTarget, dstPath); err != nil {
t.Fatal(err)
}
}
// 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
@ -436,6 +564,52 @@ func TestCopyCaseE(t *testing.T) {
}
}
// E. Symbol link following version:
// 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 TestCopyCaseEFSym(t *testing.T) {
tmpDirA, tmpDirB := getTestTempDirs(t)
defer removeAllPaths(tmpDirA, tmpDirB)
// Load A with some sample files and directories.
createSampleDir(t, tmpDirA)
srcDir := filepath.Join(tmpDirA, "dirSymlink")
linkTarget := filepath.Join(tmpDirA, "dir1")
dstDir := filepath.Join(tmpDirB, "testDir")
var err error
if err = testCopyHelperFSym(t, srcDir, dstDir); err != nil {
t.Fatalf("unexpected error %T: %s", err, err)
}
if err = dirContentsEqual(t, dstDir, linkTarget); err != nil {
t.Log("dir contents not equal")
logDirContents(t, tmpDirA)
logDirContents(t, tmpDirB)
t.Fatal(err)
}
// Now try again but using a trailing path separator for dstDir.
if err = os.RemoveAll(dstDir); err != nil {
t.Fatalf("unable to remove dstDir: %s", err)
}
dstDir = joinTrailingSep(tmpDirB, "testDir")
if err = testCopyHelperFSym(t, srcDir, dstDir); err != nil {
t.Fatalf("unexpected error %T: %s", err, err)
}
if err = dirContentsEqual(t, dstDir, linkTarget); err != nil {
t.Fatal(err)
}
}
// 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 TestCopyCaseF(t *testing.T) {
@ -447,6 +621,7 @@ func TestCopyCaseF(t *testing.T) {
createSampleDir(t, tmpDirB)
srcDir := filepath.Join(tmpDirA, "dir1")
symSrcDir := filepath.Join(tmpDirA, "dirSymlink")
dstFile := filepath.Join(tmpDirB, "file1")
var err error
@ -458,6 +633,15 @@ func TestCopyCaseF(t *testing.T) {
if err != ErrCannotCopyDir {
t.Fatalf("expected ErrCannotCopyDir error, but got %T: %s", err, err)
}
// now test with symbol link
if err = testCopyHelperFSym(t, symSrcDir, dstFile); err == nil {
t.Fatal("expected ErrCannotCopyDir error, but got nil instead")
}
if err != ErrCannotCopyDir {
t.Fatalf("expected ErrCannotCopyDir error, but got %T: %s", err, err)
}
}
// G. SRC specifies a directory and DST exists as a directory. This should copy
@ -506,6 +690,54 @@ func TestCopyCaseG(t *testing.T) {
}
}
// G. Symbol link version:
// 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 TestCopyCaseGFSym(t *testing.T) {
tmpDirA, tmpDirB := getTestTempDirs(t)
defer removeAllPaths(tmpDirA, tmpDirB)
// Load A and B with some sample files and directories.
createSampleDir(t, tmpDirA)
createSampleDir(t, tmpDirB)
srcDir := filepath.Join(tmpDirA, "dirSymlink")
linkTarget := filepath.Join(tmpDirA, "dir1")
dstDir := filepath.Join(tmpDirB, "dir2")
resultDir := filepath.Join(dstDir, "dirSymlink")
var err error
if err = testCopyHelperFSym(t, srcDir, dstDir); err != nil {
t.Fatalf("unexpected error %T: %s", err, err)
}
if err = dirContentsEqual(t, resultDir, linkTarget); err != nil {
t.Fatal(err)
}
// Now try again but using a trailing path separator for dstDir.
if err = os.RemoveAll(dstDir); err != nil {
t.Fatalf("unable to remove dstDir: %s", err)
}
if err = os.MkdirAll(dstDir, os.FileMode(0755)); err != nil {
t.Fatalf("unable to make dstDir: %s", err)
}
dstDir = joinTrailingSep(tmpDirB, "dir2")
if err = testCopyHelperFSym(t, srcDir, dstDir); err != nil {
t.Fatalf("unexpected error %T: %s", err, err)
}
if err = dirContentsEqual(t, resultDir, linkTarget); err != nil {
t.Fatal(err)
}
}
// 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
@ -553,6 +785,55 @@ func TestCopyCaseH(t *testing.T) {
}
}
// H. Symbol link following version:
// 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 TestCopyCaseHFSym(t *testing.T) {
tmpDirA, tmpDirB := getTestTempDirs(t)
defer removeAllPaths(tmpDirA, tmpDirB)
// Load A with some sample files and directories.
createSampleDir(t, tmpDirA)
srcDir := joinTrailingSep(tmpDirA, "dirSymlink") + "."
linkTarget := filepath.Join(tmpDirA, "dir1")
dstDir := filepath.Join(tmpDirB, "testDir")
var err error
if err = testCopyHelperFSym(t, srcDir, dstDir); err != nil {
t.Fatalf("unexpected error %T: %s", err, err)
}
if err = dirContentsEqual(t, dstDir, linkTarget); err != nil {
t.Log("dir contents not equal")
logDirContents(t, tmpDirA)
logDirContents(t, tmpDirB)
t.Fatal(err)
}
// Now try again but using a trailing path separator for dstDir.
if err = os.RemoveAll(dstDir); err != nil {
t.Fatalf("unable to remove dstDir: %s", err)
}
dstDir = joinTrailingSep(tmpDirB, "testDir")
if err = testCopyHelperFSym(t, srcDir, dstDir); err != nil {
t.Fatalf("unexpected error %T: %s", err, err)
}
if err = dirContentsEqual(t, dstDir, linkTarget); err != nil {
t.Log("dir contents not equal")
logDirContents(t, tmpDirA)
logDirContents(t, tmpDirB)
t.Fatal(err)
}
}
// 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.
@ -565,6 +846,7 @@ func TestCopyCaseI(t *testing.T) {
createSampleDir(t, tmpDirB)
srcDir := joinTrailingSep(tmpDirA, "dir1") + "."
symSrcDir := filepath.Join(tmpDirB, "dirSymlink")
dstFile := filepath.Join(tmpDirB, "file1")
var err error
@ -576,6 +858,15 @@ func TestCopyCaseI(t *testing.T) {
if err != ErrCannotCopyDir {
t.Fatalf("expected ErrCannotCopyDir error, but got %T: %s", err, err)
}
// now try with symbol link of dir
if err = testCopyHelperFSym(t, symSrcDir, dstFile); err == nil {
t.Fatal("expected ErrCannotCopyDir error, but got nil instead")
}
if err != ErrCannotCopyDir {
t.Fatalf("expected ErrCannotCopyDir error, but got %T: %s", err, err)
}
}
// J. SRC specifies a directory's contents only and DST exists as a directory.
@ -595,6 +886,11 @@ func TestCopyCaseJ(t *testing.T) {
var err error
// first to create an empty dir
if err = os.MkdirAll(dstDir, os.FileMode(0755)); err != nil {
t.Fatalf("unable to make dstDir: %s", err)
}
if err = testCopyHelper(t, srcDir, dstDir); err != nil {
t.Fatalf("unexpected error %T: %s", err, err)
}
@ -623,3 +919,56 @@ func TestCopyCaseJ(t *testing.T) {
t.Fatal(err)
}
}
// J. Symbol link following version:
// 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 TestCopyCaseJFSym(t *testing.T) {
tmpDirA, tmpDirB := getTestTempDirs(t)
defer removeAllPaths(tmpDirA, tmpDirB)
// Load A and B with some sample files and directories.
createSampleDir(t, tmpDirA)
createSampleDir(t, tmpDirB)
srcDir := joinTrailingSep(tmpDirA, "dirSymlink") + "."
linkTarget := filepath.Join(tmpDirA, "dir1")
dstDir := filepath.Join(tmpDirB, "dir5")
var err error
// first to create an empty dir
if err = os.MkdirAll(dstDir, os.FileMode(0755)); err != nil {
t.Fatalf("unable to make dstDir: %s", err)
}
if err = testCopyHelperFSym(t, srcDir, dstDir); err != nil {
t.Fatalf("unexpected error %T: %s", err, err)
}
if err = dirContentsEqual(t, dstDir, linkTarget); err != nil {
t.Fatal(err)
}
// Now try again but using a trailing path separator for dstDir.
if err = os.RemoveAll(dstDir); err != nil {
t.Fatalf("unable to remove dstDir: %s", err)
}
if err = os.MkdirAll(dstDir, os.FileMode(0755)); err != nil {
t.Fatalf("unable to make dstDir: %s", err)
}
dstDir = joinTrailingSep(tmpDirB, "dir5")
if err = testCopyHelperFSym(t, srcDir, dstDir); err != nil {
t.Fatalf("unexpected error %T: %s", err, err)
}
if err = dirContentsEqual(t, dstDir, linkTarget); err != nil {
t.Fatal(err)
}
}