45 lines
2.3 KiB
Diff
45 lines
2.3 KiB
Diff
This patch introduces an intermediate Gradle build step to alter the behavior
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of flutter_tools' Gradle project, specifically moving the creation of `build`
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and `.gradle` directories from within the Nix Store to somewhere in `$HOME/.cache/flutter/nix-flutter-tools-gradle/$engineShortRev`.
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Without this patch, flutter_tools' Gradle project tries to generate `build` and `.gradle`
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directories within the Nix Store. Resulting in read-only errors when trying to build a
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Flutter Android app at runtime.
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This patch takes advantage of the fact settings.gradle takes priority over settings.gradle.kts to build the intermediate Gradle project
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when a Flutter app runs `includeBuild("${settings.ext.flutterSdkPath}/packages/flutter_tools/gradle")`
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`rootProject.buildFileName = "/dev/null"` so that the intermediate project doesn't use `build.gradle.kts` that's in the same directory.
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The intermediate project makes a `settings.gradle` file in `$HOME/.cache/flutter/nix-flutter-tools-gradle/<short engine rev>/` and `includeBuild`s it.
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This Gradle project will build the actual `packages/flutter_tools/gradle` project by setting
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`rootProject.projectDir = new File("$settingsDir")` and `apply from: new File("$settingsDir/settings.gradle.kts")`.
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Now the `.gradle` will be built in `$HOME/.cache/flutter/nix-flutter-tools-gradle/<short engine rev>/`, but `build` doesn't.
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To move `build` to `$HOME/.cache/flutter/nix-flutter-tools-gradle/<short engine rev>/` as well, we need to set `buildDirectory`.
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diff --git a/packages/flutter_tools/gradle/settings.gradle b/packages/flutter_tools/gradle/settings.gradle
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new file mode 100644
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index 0000000000..b2485c94b4
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--- /dev/null
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+++ b/packages/flutter_tools/gradle/settings.gradle
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@@ -0,0 +1,19 @@
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+rootProject.buildFileName = "/dev/null"
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+
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+def engineShortRev = (new File("$settingsDir/../../../bin/internal/engine.version")).text.take(10)
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+def dir = new File("$System.env.HOME/.cache/flutter/nix-flutter-tools-gradle/$engineShortRev")
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+dir.mkdirs()
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+def file = new File(dir, "settings.gradle")
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+
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+file.text = """
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+rootProject.projectDir = new File("$settingsDir")
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+apply from: new File("$settingsDir/settings.gradle.kts")
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+
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+gradle.allprojects { project ->
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+ project.beforeEvaluate {
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+ project.layout.buildDirectory = new File("$dir/build")
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+ }
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+}
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+"""
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+
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+includeBuild(dir)
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