Revert "compat,build: pull must accept string"

This reverts commit 5b148a0.

Reverting to treating the `pull` query parameter as a boolean.
Because of deceiving Docker API documentation it was assumed that the
parameter is pull-policy, however that is not true. Docker does treat
`pull` as a boolean. What is interesting is that Docker indeed accepts
strings like `always` or `never` however Docekr both of these strings
treat as `true`, not as pull-policy. As matter of the fact it seems
there is no such a thing as pull-policy in Docker.

More context containers#17778 (comment)

Signed-off-by: Matej Vasek <[email protected]>

Author: matejvasek

pkg/api/handlers/compat/images_build.go

@@ -121,7 +121,7 @@ func BuildImage(w http.ResponseWriter, r *http.Request) {
 		OSVersion               string   `schema:"osversion"`
 		OutputFormat            string   `schema:"outputformat"`
 		Platform                []string `schema:"platform"`
-		Pull                    string   `schema:"pull"`
+		Pull                    bool     `schema:"pull"`
 		PullPolicy              string   `schema:"pullpolicy"`
 		Quiet                   bool     `schema:"q"`
 		Registry                string   `schema:"registry"`
@@ -580,19 +580,8 @@ func BuildImage(w http.ResponseWriter, r *http.Request) {
 		pullPolicy = buildahDefine.PolicyMap[query.PullPolicy]
 	} else {
 		if _, found := r.URL.Query()["pull"]; found {
-			switch strings.ToLower(query.Pull) {
-			case "false":
-				pullPolicy = buildahDefine.PullIfMissing
-			case "true":
+			if query.Pull {
 				pullPolicy = buildahDefine.PullAlways
-			default:
-				policyFromMap, foundPolicy := buildahDefine.PolicyMap[query.Pull]
-				if foundPolicy {
-					pullPolicy = policyFromMap
-				} else {
-					utils.BadRequest(w, "pull", query.Pull, fmt.Errorf("invalid pull policy: %q", query.Pull))
-					return
-				}
 			}
 		}
 	}

pkg/api/server/register_images.go

@@ -546,8 +546,8 @@ func (s *APIServer) registerImagesHandlers(r *mux.Router) error {
 	//      (As of version 1.xx)
 	//  - in: query
 	//    name: pull
-	//    type: string
-	//    default:
+	//    type: boolean
+	//    default: false
 	//    description: |
 	//      Attempt to pull the image even if an older image exists locally
 	//      (As of version 1.xx)
@@ -1453,8 +1453,8 @@ func (s *APIServer) registerImagesHandlers(r *mux.Router) error {
 	//      (As of version 1.xx)
 	//  - in: query
 	//    name: pull
-	//    type: string
-	//    default:
+	//    type: boolean
+	//    default: false
 	//    description: |
 	//      Attempt to pull the image even if an older image exists locally
 	//      (As of version 1.xx)

test/apiv2/10-images.at

@@ -234,11 +234,6 @@ t POST "build?dockerfile=containerfile" $CONTAINERFILE_TAR application/json 200
 response_headers=$(cat "$WORKDIR/curl.headers.out")
 like "$response_headers" ".*application/json.*" "header does not contain application/json"
 
-# Build api response header must contain Content-type: application/json
-t POST "build?dockerfile=containerfile&pull=never" $CONTAINERFILE_TAR application/json 200
-response_headers=$(cat "$WORKDIR/curl.headers.out")
-like "$response_headers" ".*application/json.*" "header does not contain application/json"
-
 # PR #12091: output from compat API must now include {"aux":{"ID":"sha..."}}
 t POST "build?dockerfile=containerfile" $CONTAINERFILE_TAR 200 \
   '.aux|select(has("ID")).ID~^sha256:[0-9a-f]\{64\}$'