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src/main/kotlin/io/github/sgtsilvio/gradle/oci/DockerLayerTask.kt
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| package io.github.sgtsilvio.gradle.oci | ||
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| import io.github.sgtsilvio.gradle.oci.internal.copyspec.DEFAULT_MODIFICATION_TIME | ||
| import org.apache.commons.compress.archivers.tar.TarArchiveInputStream | ||
| import org.apache.commons.compress.archivers.tar.TarArchiveOutputStream | ||
| import org.gradle.api.tasks.Input | ||
| import org.gradle.api.tasks.Optional | ||
| import org.gradle.kotlin.dsl.mapProperty | ||
| import org.gradle.kotlin.dsl.property | ||
| import org.gradle.process.ExecOperations | ||
| import java.io.ByteArrayInputStream | ||
| import java.io.FileInputStream | ||
| import java.nio.file.attribute.FileTime | ||
| import java.util.* | ||
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| /** | ||
| * @author Silvio Giebl | ||
| */ | ||
| abstract class DockerLayerTask(private val execOperations: ExecOperations) : OciLayerTask() { | ||
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| @get:Input | ||
| val from = project.objects.property<String>() // TODO replace from and platform with ImageInput | ||
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| @get:Input | ||
| val platform = project.objects.property<String>() | ||
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| @get:Input | ||
| val command = project.objects.property<String>() | ||
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| @get:Input | ||
| @get:Optional | ||
| val shell = project.objects.property<String>() | ||
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| @get:Input | ||
| @get:Optional | ||
| val user = project.objects.property<String>() | ||
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| @get:Input | ||
| @get:Optional | ||
| val workingDirectory = project.objects.property<String>() | ||
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| @get:Input | ||
| val environment = project.objects.mapProperty<String, String>() | ||
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| override fun run(tos: TarArchiveOutputStream) { | ||
| val imageReference = UUID.randomUUID() | ||
| execOperations.exec { | ||
| commandLine("docker", "build", "-", "--platform", platform.get(), "-t", imageReference) | ||
| standardInput = ByteArrayInputStream(assembleDockerfile().toByteArray()) | ||
| } | ||
| val tmpDir = temporaryDir | ||
| val savedImageTarFile = tmpDir.resolve("image.tar") | ||
| execOperations.exec { | ||
| commandLine("docker", "save", imageReference, "-o", savedImageTarFile) | ||
| } | ||
| execOperations.exec { | ||
| commandLine("docker", "rmi", imageReference) | ||
| } | ||
| val manifest = TarArchiveInputStream(FileInputStream(savedImageTarFile)).use { tis -> | ||
| while (tis.nextEntry != null) { | ||
| if (tis.currentEntry.name == "manifest.json") { | ||
| return@use tis.reader().readText() | ||
| } | ||
| } | ||
| throw IllegalStateException("manifest.json not found") | ||
| } | ||
| val lastLayerPath = | ||
| manifest.substringAfter("\"Layers\":[").substringBefore("]").split(",").last().removeSurrounding("\"") | ||
| TarArchiveInputStream(FileInputStream(savedImageTarFile)).use { tis -> | ||
| while (tis.nextEntry != null) { | ||
| if (tis.currentEntry.name == lastLayerPath) { | ||
| TarArchiveInputStream(tis).use { tis2 -> | ||
| while (tis2.nextEntry != null) { | ||
| val entry2 = tis2.currentEntry | ||
| entry2.lastModifiedTime = FileTime.from(DEFAULT_MODIFICATION_TIME) | ||
| tos.putArchiveEntry(entry2) | ||
| tis2.copyTo(tos) | ||
| tos.closeArchiveEntry() | ||
| } | ||
| } | ||
| return@use | ||
| } | ||
| } | ||
| throw IllegalStateException("$lastLayerPath not found") | ||
| } | ||
| tmpDir.deleteRecursively() | ||
| } | ||
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| private fun assembleDockerfile() = buildString { | ||
| val from = from.get() | ||
| appendLine("FROM $from") | ||
| val shell = shell.orNull | ||
| if (shell != null) { | ||
| appendLine("SHELL $shell") | ||
| } | ||
| val user = user.orNull | ||
| if (user != null) { | ||
| appendLine("USER $user") | ||
| } | ||
| val workingDirectory = workingDirectory.orNull | ||
| if (workingDirectory != null) { | ||
| appendLine("WORKDIR $workingDirectory") | ||
| } | ||
| val environment = environment.get() | ||
| if (environment.isNotEmpty()) { | ||
| appendLine("ENV ").append(environment.map { "${it.key}=\"${it.value}\"" }.joinToString(" ")) | ||
| } | ||
| appendLine("RUN echo \"Docker on MacOS creates a directory /root/.cache/rosetta in the first layer\"") | ||
| val command = command.get() | ||
| appendLine("RUN $command") | ||
| } | ||
| } |
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