Add squash-all, fix squash option in build

Translate the podman build --squash command to podman build --layers=false which
has the same functionality as docker build --squash. Add a new option --squash-all
which will squash all layers into one. This will be translated to buildah bud --squash
for the buildah bud api.

Also allow only one option, squash, layers or squash--all to be used per build command.

Fixes: https://github.com/containers/buildah/issues/1234

Signed-off-by: TomSweeneyRedHat <tsweeney@redhat.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/docs/podman-build.1.md b/docs/podman-build.1.md
index c16d964a9..567d0ead3 100644
--- a/docs/podman-build.1.md
+++ b/docs/podman-build.1.md
@@ -405,6 +405,11 @@ If you omit the unit, the system uses bytes. If you omit the size entirely, the
 
 **--squash**
 
+Squash all of the image's new layers into a single new layer; any preexisting layers
+are not squashed.
+
+**--squash-all**
+
 Squash all of the new image's layers (including those inherited from a base image) into a single new layer.
 
 **--tag**, **-t**=*imageName*