[Android] Gradle build: allow forcing deterministic builds

[Nicolas Pomepuy]

vlc-android | branch: master | Nicolas Pomepuy <nicolas at videolabs.io> | Thu May 15 09:17:47 2025 +0200| [deabfc77778a67ca1edfe3f87571ee34c4ba52fc] | committer: Duncan McNamara

Gradle build: allow forcing deterministic builds

Fixes #3215
Deterministic builds can be forced by using
-PforceDeterministic=true -PforcedHostName=HostName

> https://code.videolan.org/videolan/vlc-android/commit/deabfc77778a67ca1edfe3f87571ee34c4ba52fc
---

 application/vlc-android/build.gradle | 22 ++++++++++++++++++----
 1 file changed, 18 insertions(+), 4 deletions(-)

diff --git a/application/vlc-android/build.gradle b/application/vlc-android/build.gradle
index 179fd13547..daf4a9edd7 100644
--- a/application/vlc-android/build.gradle
+++ b/application/vlc-android/build.gradle
@@ -20,8 +20,8 @@ android {
 
     defaultConfig {
 
-        resValue "string", "build_time", buildTime()
-        resValue "string", "build_host", hostName()
+        resValue "string", "build_time", buildTime(project)
+        resValue "string", "build_host", hostName(project)
         resValue "string", "build_revision", revision()
         resValue "string", "changelog", changelog()
         resValue "string", "dav1d_version", dav1dVersion()
@@ -235,11 +235,25 @@ dependencies {
 }
 
 
-static def buildTime() {
+static def buildTime(project) {
+    if (project.hasProperty('forceDeterministic')) {
+        def code = new ByteArrayOutputStream()
+        project.exec {
+            commandLine 'git', 'show', '--no-patch', '--format=%cd' , '--date=format-local:%Y-%m-%d'
+            standardOutput = code
+        }
+        return code.toString()
+    }
     return new Date().format("yyyy-MM-dd", TimeZone.getTimeZone("UTC"))
 }
 
-static def hostName() {
+static def hostName(project) {
+    if (project.hasProperty('forceDeterministic')) {
+        if (project.hasProperty('forcedHostName')) {
+            return project.findProperty("forcedHostName")
+        }
+        return 'Unknown'
+    }
     return "${System.getProperty("user.name")}@${InetAddress.localHost.hostName}"
 }