release-action/get_jreleaser.java

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Java
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//JAVA 11+
import java.io.FileNotFoundException;
import java.io.IOException;
import java.net.URL;
import java.nio.file.Files;
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import java.nio.file.Path;
import static java.nio.file.StandardCopyOption.REPLACE_EXISTING;
import static java.nio.file.StandardOpenOption.CREATE;
import static java.nio.file.StandardOpenOption.TRUNCATE_EXISTING;
import static java.nio.file.StandardOpenOption.WRITE;
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class get_jreleaser {
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public static void main(String... args) throws Exception {
// default version
var version = "latest";
if (args.length > 1) {
System.err.println("Usage: java get_jreleaser.java [VERSION]");
System.exit(1);
}
// grab the version if specified
if (args.length == 1) {
version = args[0];
}
// check
if (null == version || version.isEmpty()) {
System.out.printf("❌ Version '%s' is invalid%n", version);
System.exit(1);
}
var versionFile = Path.of("JRELEASER_VERSION");
var cachedVersion = "";
if (Files.exists(versionFile)) {
try {
cachedVersion = Files.readString(versionFile).trim();
} catch (IOException e) {
System.out.printf("☠️ JReleaser %s could not be resolved%n", version);
e.printStackTrace();
System.exit(1);
}
}
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// resolve latest to a tagged release
if ("latest".equalsIgnoreCase(version)) {
var url = "https://jreleaser.org/releases/latest/download/VERSION";
try (var stream = new URL(url).openStream()) {
System.out.printf("✅ Located version marker%n");
Files.copy(stream, versionFile, REPLACE_EXISTING);
version = new String(Files.readAllBytes(versionFile)).trim();
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System.out.printf("✅ JReleaser latest resolves to %s%n", version);
} catch (FileNotFoundException e) {
System.out.printf("❌ JReleaser %s not found%n", version);
e.printStackTrace();
System.exit(1);
} catch (IOException e) {
System.out.printf("☠️ JReleaser %s could not be downloaded/copied%n", version);
e.printStackTrace();
System.exit(1);
}
} else {
try {
Files.writeString(versionFile, version, CREATE, TRUNCATE_EXISTING, WRITE);
} catch (IOException e) {
System.out.printf("☠️ JReleaser %s could not be resolved%n", version);
e.printStackTrace();
System.exit(1);
}
}
var jreleaserJar = Path.of("jreleaser-cli.jar");
if (version.equals(cachedVersion) && Files.exists(jreleaserJar)) {
// assume jreleaserJar has the expected version for now
System.out.printf("✅ JReleaser %s already downloaded%n", version);
System.exit(0);
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}
// setup the actual download
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var tag = !"early-access".equals(version) ? "v" + version : version;
var url = "https://github.com/jreleaser/jreleaser/releases/download/" + tag + "/jreleaser-tool-provider-" + version + ".jar";
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try (var stream = new URL(url).openStream()) {
System.out.printf("✅ Located JReleaser %s%n", version);
System.out.printf("⬇️ Downloading %s%n", url);
var size = Files.copy(stream, jreleaserJar, REPLACE_EXISTING);
System.out.printf("%s << copied %d bytes%n", jreleaserJar, size);
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System.out.printf("✅ JReleaser installed successfully%n");
} catch (FileNotFoundException e) {
System.out.printf("❌ JReleaser %s not found%n", version);
System.exit(1);
} catch (IOException e) {
System.out.printf("☠️ JReleaser %s could not be downloaded/copied%n", version);
e.printStackTrace();
System.exit(1);
}
}
}