Implementation

This change contributes an implementation that installs an Apache Tomcat instance and a collection of configuration and extensions to optimize for running in a container. It also allows users to contribute external configuration via a URI. Signed-off-by: Ben Hale <[email protected]>
paketo-buildpacks · Mar 31, 2020 · 2437ce4 · 2437ce4
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diff --git a/README.md b/README.md
@@ -2,13 +2,46 @@
 The Paketo Apache Tomcat Buildpack is a Cloud Native Buildpack that contributes Apache Tomcat and Process Types for WARs.
 
 ## Behavior
-This buildpack will participate any of the following conditions are met
+This buildpack will participate all of the following conditions are met
 
-*
+* `<APPLICATION_ROOT>/WEB-INF` exists
 
 The buildpack will do the following:
 
-*
+* Requests that a JRE be installed
+* Contribute a Tomcat instance to `$CATALINA_HOME`
+* Contribute a Tomcat instance to `$CATALINA_BASE`
+  * Contribute `context.xml`, `logging.properties`, `server.xml`, and `web.xml` to `conf/`
+  * Contribute [Access Logging Support][als], [Lifecycle Support][lcs], and [Logging Support][lgs]
+  * Contribute external configuration if available
+* Contributes `tomcat`, `task`, and `web` process types
+
+[als]: https://github.com/cloudfoundry/java-buildpack-support/tree/master/tomcat-access-logging-support
+[lcs]: https://github.com/cloudfoundry/java-buildpack-support/tree/master/tomcat-lifecycle-support
+[lgs]: https://github.com/cloudfoundry/java-buildpack-support/tree/master/tomcat-logging-support
+
+## Configuration
+| Environment Variable | Description
+| -------------------- | -----------
+| `$BP_TOMCAT_CONTEXT_PATH` | The context path to mount the application at.  Defaults to empty (`ROOT`).
+| `$BP_TOMCAT_EXT_CONF_SHA256` | The SHA256 hash of the external configuration package
+| `$BP_TOMCAT_EXT_CONF_STRIP` | The number of directory levels to strip from the external configuration package.  Defaults to `0`.
+| `$BP_TOMCAT_EXT_CONF_URI` | The download URI of the external configuration package
+| `$BP_TOMCAT_EXT_CONF_VERSION` | The version of the external configuration package
+| `$BP_TOMCAT_VERSION` |  Configure a specific Tomcat version.  This value must _exactly_ match a version available in the buildpack so typically it would configured to a wildcard such as `9.*`.
+| `BPL_TOMCAT_ACCESS_LOGGING` | Whether access logging should be activated.  Defaults to inactive.
+
+### External Configuration Package
+The artifacts that the repository provides must be in TAR format and must follow the Tomcat archive structure:
+
+```
+<CATALINA_BASE>
+└── conf
+    ├── context.xml
+    ├── server.xml
+    ├── web.xml
+    ├── ...
+```
 
 ## License
 This buildpack is released under version 2.0 of the [Apache License][a].

diff --git a/buildpack.toml b/buildpack.toml
@@ -17,7 +17,7 @@ api = "0.2"
 [buildpack]
 id      = "paketo-buildpacks/apache-tomcat"
 name    = "Paketo Apache Tomcat Buildpack"
-version = "{{.Version}}"
+version = "{{.version}}"
 
 [[stacks]]
 id = "io.buildpacks.stacks.bionic"

diff --git a/cmd/build/main.go b/cmd/build/main.go
@@ -16,5 +16,14 @@
 
 package main
 
+import (
+	"os"
+
+	"github.com/paketo-buildpacks/apache-tomcat/tomcat"
+	"github.com/paketo-buildpacks/libpak"
+	"github.com/paketo-buildpacks/libpak/bard"
+)
+
 func main() {
+	libpak.Build(tomcat.Build{Logger: bard.NewLogger(os.Stdout)})
 }
diff --git a/cmd/detect/main.go b/cmd/detect/main.go
@@ -16,5 +16,11 @@
 
 package main
 
+import (
+	"github.com/paketo-buildpacks/apache-tomcat/tomcat"
+	"github.com/paketo-buildpacks/libpak"
+)
+
 func main() {
+	libpak.Detect(tomcat.Detect{})
 }
diff --git a/go.mod b/go.mod
@@ -1,3 +1,13 @@
 module github.com/paketo-buildpacks/apache-tomcat
 
 go 1.14
+
+require (
+	github.com/buildpacks/libcnb v1.6.0
+	github.com/heroku/color v0.0.6
+	github.com/onsi/gomega v1.9.0
+	github.com/paketo-buildpacks/libpak v1.21.0
+	github.com/rakyll/statik v0.1.7
+	github.com/sclevine/spec v1.4.0
+	golang.org/x/sys v0.0.0-20200331124033-c3d80250170d // indirect
+)
diff --git a/go.sum b/go.sum
@@ -0,0 +1,94 @@
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diff --git a/tomcat/access-logging-support.sh b/tomcat/access-logging-support.sh
@@ -0,0 +1,7 @@
+ENABLED=${BPL_TOMCAT_ACCESS_LOGGING:=n}
+
+[[ "${ENABLED}" = "n" ]] && return
+
+printf "Tomcat Access Logging enabled\n"
+
+export JAVA_OPTS="${JAVA_OPTS} -Daccess.logging.enabled=true"