podman save: fix redirect of multi-images

Fix a bug when saving multi-image archives where the progress bars from
copying images was accidentally written to the archive and hence
corrupted it.

Signed-off-by: Valentin Rothberg <rothberg@redhat.com>

2 files changed, 42 insertions, 6 deletions

diff --git a/cmd/podman/images/save.go b/cmd/podman/images/save.go
index c57f61221..b164a2534 100644
--- a/cmd/podman/images/save.go
+++ b/cmd/podman/images/save.go
@@ -94,6 +94,7 @@ func save(cmd *cobra.Command, args []string) (finalErr error) {
 		return errors.Errorf("--compress can only be set when --format is either 'oci-dir' or 'docker-dir'")
 	}
 	if len(saveOpts.Output) == 0 {
+		saveOpts.Quiet = true
 		fi := os.Stdout
 		if terminal.IsTerminal(int(fi.Fd())) {
 			return errors.Errorf("refusing to save to terminal. Use -o flag or redirect")
@@ -122,12 +123,6 @@ func save(cmd *cobra.Command, args []string) (finalErr error) {
 		tags = args[1:]
 	}
 
-	// Decide whether c/image's progress bars should use stderr or stdout.
-	// If the output is set of stdout, any log message there would corrupt
-	// the tarfile.
-	if saveOpts.Output == os.Stdout.Name() {
-		saveOpts.Quiet = true
-	}
 	err := registry.ImageEngine().Save(context.Background(), args[0], tags, saveOpts)
 	if err == nil {
 		succeeded = true
diff --git a/test/system/120-load.bats b/test/system/120-load.bats
index d7aa16d95..8ea9b1c69 100644
--- a/test/system/120-load.bats
+++ b/test/system/120-load.bats
@@ -147,4 +147,45 @@ verify_iid_and_name() {
        "Diagnostic from 'podman load' without redirection or -i"
 }
 
+@test "podman load - multi-image archive" {
+    img1="quay.io/libpod/testimage:00000000"
+    img2="quay.io/libpod/testimage:20200902"
+    archive=$PODMAN_TMPDIR/myimage-$(random_string 8).tar
+
+    run_podman pull $img1
+    run_podman pull $img2
+
+    run_podman save -m -o $archive $img1 $img2
+    run_podman rmi -f $img1 $img2
+    run_podman load -i $archive
+
+    run_podman image exists $img1
+    run_podman image exists $img2
+    run_podman rmi -f $img1 $img2
+}
+
+@test "podman load - multi-image archive with redirect" {
+    img1="quay.io/libpod/testimage:00000000"
+    img2="quay.io/libpod/testimage:20200902"
+    archive=$PODMAN_TMPDIR/myimage-$(random_string 8).tar
+
+    run_podman pull $img1
+    run_podman pull $img2
+
+    # We can't use run_podman because that uses the BATS 'run' function
+    # which redirects stdout and stderr. Here we need to guarantee
+    # that podman's stdout is a pipe, not any other form of redirection
+    $PODMAN save -m $img1 $img2 | cat >$archive
+    if [ "$status" -ne 0 ]; then
+        die "Command failed: podman save ... | cat"
+    fi
+
+    run_podman rmi -f $img1 $img2
+    run_podman load -i $archive
+
+    run_podman image exists $img1
+    run_podman image exists $img2
+    run_podman rmi -f $img1 $img2
+}
+
 # vim: filetype=sh