From 35ffe7e82c96a81094ef7d42f18b50d0b8eb95fc Mon Sep 17 00:00:00 2001
From: Kirill Likhodedov <Kirill.Likhodedov@jetbrains.com>
Date: Fri, 27 Jan 2012 18:26:40 +0400
Subject: [PATCH] Enhance git pre-commit user.name check for old Gits without
 %HOME%

On Windows if %HOME% is not defined and Git is started via git.exe (not git.cmd), Git 1.7.0.2 and older doesn't define %HOME% properly.
 We used to set up %HOME% := %USERPROFILE%, but it is bad practice (IDEA-76150).
 Now just warn the user to let him update Git or set up %HOME% manually.
---
 .../checkin/GitCheckinHandlerFactory.java      | 18 +++++++++++++++++-
 .../git4idea/config/GitVersionSpecialty.java   | 11 +++++++++--
 2 files changed, 26 insertions(+), 3 deletions(-)

diff --git a/plugins/git4idea/src/git4idea/checkin/GitCheckinHandlerFactory.java b/plugins/git4idea/src/git4idea/checkin/GitCheckinHandlerFactory.java
index dcbe6948d172..733862975ef5 100644
--- a/plugins/git4idea/src/git4idea/checkin/GitCheckinHandlerFactory.java
+++ b/plugins/git4idea/src/git4idea/checkin/GitCheckinHandlerFactory.java
@@ -30,6 +30,8 @@ import com.intellij.openapi.vfs.VirtualFile;
 import com.intellij.util.PairConsumer;
 import git4idea.GitVcs;
 import git4idea.config.GitConfigUtil;
+import git4idea.config.GitVersion;
+import git4idea.config.GitVersionSpecialty;
 import git4idea.i18n.GitBundle;
 import git4idea.repo.GitRepository;
 import git4idea.repo.GitRepositoryManager;
@@ -82,10 +84,13 @@ public class GitCheckinHandlerFactory extends VcsCheckinHandlerFactory {
 
     private ReturnResult checkUserName() {
       Project project = myPanel.getProject();
+      GitVcs vcs = GitVcs.getInstance(project);
+      assert vcs != null;
+
       Collection<VirtualFile> notDefined = new ArrayList<VirtualFile>();
       Map<VirtualFile, Pair<String, String>> defined = new HashMap<VirtualFile, Pair<String, String>>();
       Collection<VirtualFile> allRoots = new ArrayList<VirtualFile>(Arrays.asList(
-        ProjectLevelVcsManager.getInstance(project).getRootsUnderVcs(GitVcs.getInstance(project))));
+        ProjectLevelVcsManager.getInstance(project).getRootsUnderVcs(vcs)));
 
       Collection<VirtualFile> affectedRoots = myPanel.getRoots();
       for (VirtualFile root : affectedRoots) {
@@ -110,6 +115,17 @@ public class GitCheckinHandlerFactory extends VcsCheckinHandlerFactory {
         return ReturnResult.COMMIT;
       }
 
+      GitVersion version = vcs.getVersion();
+      if (System.getenv("HOME") == null && GitVersionSpecialty.DOESNT_DEFINE_HOME_ENV_VAR.existsIn(version)) {
+        Messages.showErrorDialog(project,
+                                 "You are using Git " + version + " which doesn't define %HOME% environment variable properly.\n" +
+                                 "Consider updating Git to a newer version " +
+                                 "or define %HOME% to point to the place where the global .gitconfig is stored \n" +
+                                 "(it is usually %USERPROFILE% or %HOMEDRIVE%%HOMEPATH%).",
+                                 "HOME Variable Is Not Defined");
+        return ReturnResult.CANCEL;
+      }
+
       if (defined.isEmpty() && allRoots.size() > affectedRoots.size()) {
         allRoots.removeAll(affectedRoots);
         for (VirtualFile root : allRoots) {
diff --git a/plugins/git4idea/src/git4idea/config/GitVersionSpecialty.java b/plugins/git4idea/src/git4idea/config/GitVersionSpecialty.java
index b59570d461fd..cc3d67b84809 100644
--- a/plugins/git4idea/src/git4idea/config/GitVersionSpecialty.java
+++ b/plugins/git4idea/src/git4idea/config/GitVersionSpecialty.java
@@ -15,6 +15,7 @@
  */
 package git4idea.config;
 
+import com.intellij.openapi.util.SystemInfo;
 import org.jetbrains.annotations.NotNull;
 
 /**
@@ -74,10 +75,16 @@ public enum GitVersionSpecialty {
    */
   KNOWS_STATUS_PORCELAIN {
     @Override
-    public boolean existsIn(@NotNull GitVersion
-    version) {
+    public boolean existsIn(@NotNull GitVersion version) {
       return version.isLaterOrEqual(new GitVersion(1, 7, 0, 0));
     }
+  },
+
+  DOESNT_DEFINE_HOME_ENV_VAR {
+    @Override
+    public boolean existsIn(@NotNull GitVersion version) {
+      return SystemInfo.isWindows && version.isOlderOrEqual(new GitVersion(1, 7, 0, 2));
+    }
   };
 
   public abstract boolean existsIn(@NotNull GitVersion version);