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authorValentin Rothberg <rothberg@redhat.com>2021-03-02 09:20:53 +0100
committerValentin Rothberg <rothberg@redhat.com>2021-03-04 15:43:12 +0100
commita090301bbb10424ce4f99e40c97959f0e8664718 (patch)
tree3b2596e3d152204d35162b1ca89f524c5803ad8c /libpod/define/fileinfo.go
parent833670079c5b1f95fbb7c9bb8ba9095f1c66c7b4 (diff)
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podman cp: support copying on tmpfs mounts
Traditionally, the path resolution for containers has been resolved on the *host*; relative to the container's mount point or relative to specified bind mounts or volumes. While this works nicely for non-running containers, it poses a problem for running ones. In that case, certain kinds of mounts (e.g., tmpfs) will not resolve correctly. A tmpfs is held in memory and hence cannot be resolved relatively to the container's mount point. A copy operation will succeed but the data will not show up inside the container. To support these kinds of mounts, we need to join the *running* container's mount namespace (and PID namespace) when copying. Note that this change implies moving the copy and stat logic into `libpod` since we need to keep the container locked to avoid race conditions. The immediate benefit is that all logic is now inside `libpod`; the code isn't scattered anymore. Further note that Docker does not support copying to tmpfs mounts. Tests have been extended to cover *both* path resolutions for running and created containers. New tests have been added to exercise the tmpfs-mount case. For the record: Some tests could be improved by using `start -a` instead of a start-exec sequence. Unfortunately, `start -a` is flaky in the CI which forced me to use the more expensive start-exec option. Signed-off-by: Valentin Rothberg <rothberg@redhat.com>
Diffstat (limited to 'libpod/define/fileinfo.go')
-rw-r--r--libpod/define/fileinfo.go16
1 files changed, 16 insertions, 0 deletions
diff --git a/libpod/define/fileinfo.go b/libpod/define/fileinfo.go
new file mode 100644
index 000000000..2c7b6fe99
--- /dev/null
+++ b/libpod/define/fileinfo.go
@@ -0,0 +1,16 @@
+package define
+
+import (
+ "os"
+ "time"
+)
+
+// FileInfo describes the attributes of a file or diretory.
+type FileInfo struct {
+ Name string `json:"name"`
+ Size int64 `json:"size"`
+ Mode os.FileMode `json:"mode"`
+ ModTime time.Time `json:"mtime"`
+ IsDir bool `json:"isDir"`
+ LinkTarget string `json:"linkTarget"`
+}