podman untag: error if tag doesn't exist

Throw an error if a specified tag does not exist.  Also make sure that
the user input is normalized as we already do for `podman tag`.

To prevent regressions, add a set of end-to-end and systemd tests.

Last but not least, update the docs and add bash completions.

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

1 files changed, 35 insertions, 0 deletions

diff --git a/test/system/020-tag.bats b/test/system/020-tag.bats
new file mode 100644
index 000000000..7593ad68f
--- /dev/null
+++ b/test/system/020-tag.bats
@@ -0,0 +1,35 @@
+#!/usr/bin/env bats
+
+load helpers
+
+# helper function for "podman tag/untag" test
+function _tag_and_check() {
+    local tag_as="$1"
+    local check_as="$2"
+
+    run_podman tag $IMAGE $tag_as
+    run_podman image exists $check_as
+    run_podman untag $IMAGE $check_as
+    run_podman 1 image exists $check_as
+}
+
+@test "podman tag/untag" {
+	# Test a fully-qualified image reference.
+	_tag_and_check registry.com/image:latest registry.com/image:latest
+
+	# Test a reference without tag and make sure ":latest" is appended.
+	_tag_and_check registry.com/image registry.com/image:latest
+
+	# Test a tagged short image and make sure "localhost/" is prepended.
+	_tag_and_check image:latest localhost/image:latest
+
+	# Test a short image without tag and make sure "localhost/" is
+	# prepended and ":latest" is appended.
+	_tag_and_check image localhost/image:latest
+
+	# Test error case.
+	run_podman 125 untag $IMAGE registry.com/foo:bar
+	is "$output" "Error: \"registry.com/foo:bar\": no such tag"
+}
+
+# vim: filetype=sh