Add support for dir transport to kpod save

kpod save can now save images to directories using the
dir transport. Manifest conversion is also possible.
To save with the oci manifest type set --format to oci-dir
and to save with the v2s2(docker) manifest type, set --format
to docker-dir.
The layers can be compressed as well when saving to a directory
using the --compress flag.
Added functionality to kpod load to be able to load image from
a directory

Signed-off-by: umohnani8 <umohnani@redhat.com>

Closes: #137
Approved by: rhatdan

1 files changed, 42 insertions, 5 deletions

diff --git a/docs/kpod-save.1.md b/docs/kpod-save.1.md
index dbcf96d04..ece4bea5e 100644
--- a/docs/kpod-save.1.md
+++ b/docs/kpod-save.1.md
@@ -14,10 +14,10 @@ kpod-save - Save an image to docker-archive or oci-archive
 [**--help**|**-h**]
 
 ## DESCRIPTION
-**kpod save** saves an image to either **docker-archive** or **oci-archive**
-on the local machine, default is **docker-archive**.
-**kpod save** writes to STDOUT by default and can be redirected to a file using the **output** flag.
-The **quiet** flag suppresses the output when set.
+**kpod save** saves an image to either **docker-archive**, **oci-archive**, **oci-dir** (directory
+with oci manifest type), or **docker-dir** (directory with v2s2 manifest type) on the local machine,
+default is **docker-archive**. **kpod save** writes to STDOUT by default and can be redirected to a
+file using the **output** flag. The **quiet** flag suppresses the output when set.
 
 **kpod [GLOBAL OPTIONS]**
 
@@ -27,13 +27,20 @@ The **quiet** flag suppresses the output when set.
 
 ## OPTIONS
 
+**--compress**
+
+Compress tarball image layers when pushing to a directory using the 'dir' transport. (default is same compression type, compressed or uncompressed, as source)
+Note: This flag can only be set when using the **dir** transport i.e --format=oci-dir or --format-docker-dir
+
 **--output, -o**
 Write to a file, default is STDOUT
 
 **--format**
-Save image to **oci-archive**
+Save image to **oci-archive**, **oci-dir** (directory with oci manifest type), or **docker-dir** (directory with v2s2 manifest type)
 ```
 --format oci-archive
+--format oci-dir
+--format docker-dir
 ```
 
 **--quiet, -q**
@@ -53,6 +60,36 @@ Suppress the output
 # kpod save -o oci-alpine.tar --format oci-archive alpine
 ```
 
+```
+# kpod save --compress --format oci-dir -o alp-dir alpine
+Getting image source signatures
+Copying blob sha256:2fdfe1cd78c20d05774f0919be19bc1a3e4729bce219968e4188e7e0f1af679d
+ 1.97 MB / 1.97 MB [========================================================] 0s
+Copying config sha256:501d1a8f0487e93128df34ea349795bc324d5e0c0d5112e08386a9dfaff620be
+ 584 B / 584 B [============================================================] 0s
+Writing manifest to image destination
+Storing signatures
+```
+
+```
+# kpod save --format docker-dir -o ubuntu-dir ubuntu
+Getting image source signatures
+Copying blob sha256:660c48dd555dcbfdfe19c80a30f557ac57a15f595250e67bfad1e5663c1725bb
+ 45.55 MB / 45.55 MB [======================================================] 8s
+Copying blob sha256:4c7380416e7816a5ab1f840482c9c3ca8de58c6f3ee7f95e55ad299abbfe599f
+ 846 B / 846 B [============================================================] 0s
+Copying blob sha256:421e436b5f80d876128b74139531693be9b4e59e4f1081c9a3c379c95094e375
+ 620 B / 620 B [============================================================] 0s
+Copying blob sha256:e4ce6c3651b3a090bb43688f512f687ea6e3e533132bcbc4a83fb97e7046cea3
+ 849 B / 849 B [============================================================] 0s
+Copying blob sha256:be588e74bd348ce48bb7161350f4b9d783c331f37a853a80b0b4abc0a33c569e
+ 169 B / 169 B [============================================================] 0s
+Copying config sha256:20c44cd7596ff4807aef84273c99588d22749e2a7e15a7545ac96347baa65eda
+ 3.53 KB / 3.53 KB [========================================================] 0s
+Writing manifest to image destination
+Storing signatures
+```
+
 ## SEE ALSO
 kpod(1), kpod-load(1), crio(8), crio.conf(5)