From 1f2f7e74590090fe8ba68b25f83f2ca08e2f201d Mon Sep 17 00:00:00 2001
From: Valentin Rothberg <rothberg@redhat.com>
Date: Tue, 9 Mar 2021 08:54:21 +0100
Subject: podman cp: evaluate symlink correctly when copying from container
When copying from a container, make sure to evaluate the symlinks
correctly. Add tests copying a symlinked directory from a running and
a non-running container to execute both path-resolution paths.
Signed-off-by: Valentin Rothberg <rothberg@redhat.com>
---
libpod/container_stat_linux.go | 42 +++++++++++++++++++++++++++++++++---------
1 file changed, 33 insertions(+), 9 deletions(-)
(limited to 'libpod')
diff --git a/libpod/container_stat_linux.go b/libpod/container_stat_linux.go
index 307b75c14..0b4d9e2df 100644
--- a/libpod/container_stat_linux.go
+++ b/libpod/container_stat_linux.go
@@ -64,6 +64,13 @@ func (c *Container) stat(ctx context.Context, containerMountPoint string, contai
containerPath = "/."
}
+ // Wildcards are not allowed.
+ // TODO: it's now technically possible wildcards.
+ // We may consider enabling support in the future.
+ if strings.Contains(containerPath, "*") {
+ return nil, "", "", copy.ErrENOENT
+ }
+
if c.state.State == define.ContainerStateRunning {
// If the container is running, we need to join it's mount namespace
// and stat there.
@@ -88,7 +95,8 @@ func (c *Container) stat(ctx context.Context, containerMountPoint string, contai
}
if statInfo.IsSymlink {
- // Evaluated symlinks are always relative to the container's mount point.
+ // Symlinks are already evaluated and always relative to the
+ // container's mount point.
absContainerPath = statInfo.ImmediateTarget
} else if strings.HasPrefix(resolvedPath, containerMountPoint) {
// If the path is on the container's mount point, strip it off.
@@ -143,15 +151,31 @@ func secureStat(root string, path string) (*copier.StatForItem, error) {
if len(globStats) != 1 {
return nil, errors.Errorf("internal error: secureStat: expected 1 item but got %d", len(globStats))
}
-
- stat, exists := globStats[0].Results[glob] // only one glob passed, so that's okay
- if !exists {
- return nil, copy.ErrENOENT
+ if len(globStats) != 1 {
+ return nil, errors.Errorf("internal error: secureStat: expected 1 result but got %d", len(globStats[0].Results))
}
- var statErr error
- if stat.Error != "" {
- statErr = errors.New(stat.Error)
+ // NOTE: the key in the map differ from `glob` when hitting symlink.
+ // Hence, we just take the first (and only) key/value pair.
+ for _, stat := range globStats[0].Results {
+ var statErr error
+ if stat.Error != "" {
+ statErr = errors.New(stat.Error)
+ }
+ // If necessary evaluate the symlink
+ if stat.IsSymlink {
+ target, err := copier.Eval(root, path, copier.EvalOptions{})
+ if err != nil {
+ return nil, errors.Wrap(err, "error evaluating symlink in container")
+ }
+ // Need to make sure the symlink is relative to the root!
+ target = strings.TrimPrefix(target, root)
+ target = filepath.Join("/", target)
+ stat.ImmediateTarget = target
+ }
+ return stat, statErr
}
- return stat, statErr
+
+ // Nothing found!
+ return nil, copy.ErrENOENT
}
--
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