Add tag filtering for offline_packages and republish_images

I decided to only handle prefixes. So anything where the version number
is at the end of the tag.

Signed-off-by: Andrew Su <[email protected]>

README.md

@@ -227,6 +227,7 @@ offline_packages:
 - source: paketo-buildpacks/adoptium
   target: gcr.io/tanzu-buildpacks/adoptium
   path: subdir/adoptium
+  tag_prefix: my-buildpack/
   platform:
     os: linux
 ```
@@ -235,6 +236,8 @@ offline_packages:
 
 `path` is the optional path to the buildpack's directory relative to the repository's root. Defaults to the repository root.
 
+`tag_prefix` is the optional prefix to filter for when detecting the buildpack's version via tags. Defaults to empty string.
+
 `platform` describes what platform the created package should be built for. `os` can be set to `linux` or `windows` (`linux` by default).
 
 #### `republish_images`
@@ -244,12 +247,15 @@ republish_images:
   target: gcr.io/tanzu-buildpacks/bellsoft-liberica-lite
   id: tanzu-buildpacks/bellsoft-liberica-lite
   target_repo: paketo-buildpacks/bellsoft-liberica
+  tag_prefix: java/
 ```
 
 `republish_images` is a list of objects that describe a `source` Docker registry location, a `target` Docker registry location, and a new buildpack id. If defined, each object will create a `republish-image` workflow that is responsible for detecting new source images, modifying the buildpack id of the image to the new id, and publishing a new target image with the modified buildpack id.
 
 The `target_repo` setting can be used to point the workflow to a different source control repository for the target image. It's assumed to be the current repository, but for cases where you have a utility repo which is republishing multiple images you need to point the workflow to are repository from which it can read the git tags and extract the target version. The example above, points it to the source image's code repository so it'll end up with a source and target version that are in sync.
 
+`tag_prefix` is the optional prefix to filter for when detecting the buildpack's version via tags. Defaults to empty string.
+
 #### `actions`
 ```yaml
 actions:

octo/check-republish-version.sh

@@ -19,19 +19,22 @@ contains() {
 
 IMAGES=$(crane ls "${TARGET}")
 
-for GIT in $(git tag | sort -V -r ); do
-  if contains "${GIT}" "${IMAGES}"; then
-    echo "Found ${GIT}. Skipping."
+for TAG in $(git tag -l "${TAG_PREFIX}*" | sort -V -r ); do
+  VERSION=${TAG#${TAG_PREFIX}}
+  VERSION=${VERSION#v}
+
+  if contains "${VERSION}" "${IMAGES}"; then
+    echo "Found ${TAG}. Skipping."
     echo "::set-output name=skip::true"
     exit
   fi
 
-  echo "::group::Checking out ${GIT}"
+  echo "::group::Checking out ${TAG}"
     git checkout -- .
-    git checkout "${GIT}"
-    echo "::endgroup::"
-    echo "::set-output name=target::${GIT#v}"
-  break
+    git checkout "${TAG}"
+  echo "::endgroup::"
+  echo "::set-output name=version::${VERSION}"
+  exit
 done
 
 for IMG in $(crane ls "${SOURCE}" | grep -v "latest" | sort -V -r); do

octo/checkout-next-version.sh

@@ -19,17 +19,20 @@ contains() {
 
 IMAGES=$(crane ls "${TARGET}")
 
-for GIT in $(git tag | sort -V -r ); do
-  if contains "${GIT}" "${IMAGES}"; then
-    echo "Found ${GIT}. Skipping."
+for TAG in $(git tag -l "${TAG_PREFIX}*" | sort -V -r ); do
+  VERSION=${TAG#${TAG_PREFIX}}
+  VERSION=${VERSION#v}
+
+  if contains "${VERSION}" "${IMAGES}"; then
+    echo "Found ${TAG}. Skipping."
     echo "::set-output name=skip::true"
     exit
   fi
 
-  echo "::group::Checking out ${GIT}"
+  echo "::group::Checking out ${TAG}"
     git checkout -- .
-    git checkout "${GIT}"
+    git checkout "${TAG}"
   echo "::endgroup::"
-  echo "::set-output name=version::${GIT#v}"
+  echo "::set-output name=version::${VERSION}"
   exit
 done

octo/descriptor.go

@@ -86,13 +86,15 @@ type OfflinePackage struct {
 	Source     string
 	Target     string
 	SourcePath string `yaml:"source_path"`
+	TagPrefix  string `yaml:"tag_prefix"`
 	Platform   Platform
 }
 
 type RepublishImage struct {
 	Source     string
 	Target     string
 	ID         string
+	TagPrefix  string `yaml:"tag_prefix"`
 	TargetRepo string `yaml:"target_repo"`
 }
 

octo/lite_packages.go

@@ -67,8 +67,9 @@ func contributeLitePackage(descriptor Descriptor, republishImage RepublishImage)
 						Name: "Check for next version",
 						Run:  StatikString("/check-republish-version.sh"),
 						Env: map[string]string{
-							"SOURCE": republishImage.Source,
-							"TARGET": republishImage.Target,
+							"SOURCE":     republishImage.Source,
+							"TARGET":     republishImage.Target,
+							"TAG_PREFIX": republishImage.TagPrefix,
 						},
 					},
 					{

octo/offline_packages.go

@@ -68,8 +68,9 @@ func contributeOfflinePackage(descriptor Descriptor, offlinePackage OfflinePacka
 						Name: "Checkout next version",
 						Run:  StatikString("/checkout-next-version.sh"),
 						Env: map[string]string{
-							"SOURCE": offlinePackage.Source,
-							"TARGET": offlinePackage.Target,
+							"SOURCE":     offlinePackage.Source,
+							"TARGET":     offlinePackage.Target,
+							"TAG_PREFIX": offlinePackage.TagPrefix,
 						},
 					},
 					{