Align the full version schema across all artifacts

Summary:
The version number used for packaging symbols and xswiftbus was not the
full one including the timestamp.
This change adds the last commit timestamp (in contrast to the build
timestamp used before) as regular part of the version number. This helps
us to also keep the version number consistent with the content across all
installers. The version number will change only, if the last commit was
modified and not with each different build.
In the end, all jenkins jobs building from the same commit should produce
artifacts with the same version everywhere.

ref T204

Reviewers: #swift_pilot_client, kbasan

Reviewed By: #swift_pilot_client, kbasan

Subscribers: jenkins

Maniphest Tasks: T204

Differential Revision: https://dev.swift-project.org/D68

src/blackconfig/blackconfig.pro

@@ -22,8 +22,10 @@ else: GIT_BIN = $$system(which git 2> /dev/null)
 
 isEmpty(GIT_BIN) {
     GIT_HEAD_SHA1="<unknown>"
+    GIT_COMMIT_TS="0"
 } else {
     GIT_HEAD_SHA1=$$system(git rev-parse --short HEAD)
+    GIT_COMMIT_TS=$$system(git log -1 --date=format:'%Y%m%d%H%M' --pretty=format:%cd)
 }
 
 load(common_post)

src/blackconfig/buildconfig.cpp

@@ -192,7 +192,7 @@ namespace BlackConfig
 
     const QVersionNumber &CBuildConfig::getVersion()
     {
-        static const QVersionNumber v { versionMajor(), versionMinor(), versionMicro(), buildTimestampAsVersionSegment(buildTimestamp()) };
+        static const QVersionNumber v { versionMajor(), versionMinor(), versionMicro(), lastCommitTimestampAsVersionSegment(lastCommitTimestamp()) };
         return v;
     }
 
@@ -220,20 +220,20 @@ namespace BlackConfig
         return dt;
     }
 
-    int CBuildConfig::buildTimestampAsVersionSegment(const QDateTime &buildTimestamp)
+    int CBuildConfig::lastCommitTimestampAsVersionSegment(const QDateTime &lastCommitTimestamp)
     {
-        if (buildTimestamp.isValid())
+        if (lastCommitTimestamp.isValid())
         {
-            const QString bts = buildTimestamp.toString("yyyyMMddHHmm");
+            const QString bts = lastCommitTimestamp.toString("yyyyMMddHHmm");
             bool ok;
-            const long long btsll = bts.toLongLong(&ok); // at least 64bit
+            const long long lctsll = bts.toLongLong(&ok); // at least 64bit
             if (!ok) { return 0; }
             // now we have to converto int
             // max 2147483647 (2^31 - 1)
             //      1MMddHHmm (years since 2010)
             const long long yearOffset = 201000000000;
-            const int btsInt = btsll - yearOffset;
-            return btsInt;
+            const int lctsInt = lctsll - yearOffset;
+            return lctsInt;
         }
         return 0; // intentionally 0 => 0.7.3.0 <-
     }

src/blackconfig/buildconfig.h

@@ -119,6 +119,9 @@ namespace BlackConfig
         //! Returns SHA-1 of git HEAD at build time
         static const QString &gitHeadSha1();
 
+        //! Timestamp of the last commit (NOT the authored timestamp)
+        static const QDateTime &lastCommitTimestamp(); // defined in buildconfig_gen.cpp.in
+
         //! Build timestamp
         static const QDateTime &buildTimestamp();
 
@@ -131,8 +134,8 @@ namespace BlackConfig
         //! Version as QVersionNumber
         static const QString &getVersionString();
 
-        //! Turns build timestamp into a version number
-        static int buildTimestampAsVersionSegment(const QDateTime &buildTimestamp);
+        //! Turns last commit timestamp into a version number
+        static int lastCommitTimestampAsVersionSegment(const QDateTime &lastCommitTimestamp);
 
         //! Build ABI parts as in http://doc.qt.io/qt-5/qsysinfo.html#buildAbi
         static const QStringList &getBuildAbiParts();

src/blackconfig/buildconfig_gen.cpp.in

@@ -161,6 +161,22 @@ const QString &BlackConfig::CBuildConfig::gitHeadSha1()
     return gitHeadSha1;
 }
 
+namespace Private
+{
+    const QDateTime lastCommitTimestampImpl()
+    {
+        QDateTime dt = QDateTime::fromString(\"$$GIT_COMMIT_TS\", \"yyyyMMddHHmm\");
+        dt.setTimeSpec(Qt::UTC);
+        return dt;
+    }
+}
+
+const QDateTime &BlackConfig::CBuildConfig::lastCommitTimestamp()
+{
+    static const QDateTime dt = Private::lastCommitTimestampImpl();
+    return dt;
+}
+
 int BlackConfig::CBuildConfig::versionMajor() { return $$BLACK_VER_MAJ; }
 int BlackConfig::CBuildConfig::versionMinor() { return $$BLACK_VER_MIN; }
 int BlackConfig::CBuildConfig::versionMicro() { return $$BLACK_VER_MIC; }

src/blackmisc/db/distribution.cpp

@@ -253,10 +253,7 @@ namespace BlackMisc
                 return QVersionNumber::fromString(v);
             }
 
-            const QString versionTimestampString = BlackMisc::digitOnlyString(ts1Match.captured(0));
-            const QDateTime versionTimestamp = QDateTime::fromString(versionTimestampString, "yyyyMMddHHmmss");
-            const QString lastSegment = QString::number(CBuildConfig::buildTimestampAsVersionSegment(versionTimestamp));
-
+            const QString lastSegment = BlackMisc::digitOnlyString(ts1Match.captured(0));
             v += lastSegment;
             return QVersionNumber::fromString(v);
         }