[git] check if repository is a shallow clone

plugins/git4idea/src/git4idea/repo/GitRepoInfo.java

@@ -38,6 +38,7 @@ public class GitRepoInfo {
   @NotNull private final Set<GitBranchTrackInfo> myBranchTrackInfos;
   @NotNull private final Collection<GitSubmoduleInfo> mySubmodules;
   @NotNull private final GitHooksInfo myHooksInfo;
+  private final boolean myIsShallow;
 
   public GitRepoInfo(@Nullable GitLocalBranch currentBranch,
                      @Nullable String currentRevision,
@@ -47,7 +48,8 @@ public class GitRepoInfo {
                      @NotNull Map<GitRemoteBranch, Hash> remoteBranches,
                      @NotNull Collection<GitBranchTrackInfo> branchTrackInfos,
                      @NotNull Collection<GitSubmoduleInfo> submodules,
-                     @NotNull GitHooksInfo hooksInfo) {
+                     @NotNull GitHooksInfo hooksInfo,
+                     boolean isShallow) {
     myCurrentBranch = currentBranch;
     myCurrentRevision = currentRevision;
     myState = state;
@@ -57,6 +59,7 @@ public class GitRepoInfo {
     myBranchTrackInfos = new LinkedHashSet<>(branchTrackInfos);
     mySubmodules = submodules;
     myHooksInfo = hooksInfo;
+    myIsShallow = isShallow;
   }
 
   @Nullable
@@ -110,6 +113,10 @@ public class GitRepoInfo {
     return myHooksInfo;
   }
 
+  public boolean isShallow() {
+    return myIsShallow;
+  }
+
   @Override
   public boolean equals(Object o) {
     if (this == o) return true;
@@ -126,6 +133,7 @@ public class GitRepoInfo {
     if (!areEqual(myRemoteBranches, info.myRemoteBranches)) return false;
     if (!mySubmodules.equals(info.mySubmodules)) return false;
     if (!myHooksInfo.equals(info.myHooksInfo)) return false;
+    if (myIsShallow != info.myIsShallow) return false;
 
     return true;
   }
@@ -141,6 +149,7 @@ public class GitRepoInfo {
     result = 31 * result + myBranchTrackInfos.hashCode();
     result = 31 * result + mySubmodules.hashCode();
     result = 31 * result + myHooksInfo.hashCode();
+    result = 31 * result + (myIsShallow ? 1 : 0);
     return result;
   }
 
@@ -178,5 +187,4 @@ public class GitRepoInfo {
       return b1.getKey().getName().equals(b2.getKey().getName()) && b1.getValue().equals(b2.getValue());
     }
   }
-
 }

plugins/git4idea/src/git4idea/repo/GitRepositoryFiles.java

@@ -59,6 +59,7 @@ public class GitRepositoryFiles {
   private static final String HOOKS = "hooks";
   private static final String PRE_COMMIT_HOOK = "pre-commit";
   private static final String PRE_PUSH_HOOK = "pre-push";
+  private static final String SHALLOW = "shallow";
 
   private final VirtualFile myMainDir;
   private final VirtualFile myWorktreeDir;
@@ -81,6 +82,7 @@ public class GitRepositoryFiles {
   private final String myInfoDirPath;
   private final String myExcludePath;
   private final String myHooksDirPath;
+  private final String myShallow;
 
   private GitRepositoryFiles(@NotNull VirtualFile mainDir, @NotNull VirtualFile worktreeDir) {
     myMainDir = mainDir;
@@ -96,6 +98,7 @@ public class GitRepositoryFiles {
     myInfoDirPath = mainPath + slash(INFO);
     myExcludePath = mainPath + slash(INFO_EXCLUDE);
     myHooksDirPath = mainPath + slash(HOOKS);
+    myShallow = mainPath + slash(SHALLOW);
 
     String worktreePath = myWorktreeDir.getPath();
     myHeadFilePath = worktreePath + slash(HEAD);
@@ -226,6 +229,11 @@ public class GitRepositoryFiles {
     return file(myHooksDirPath + slash(PRE_PUSH_HOOK));
   }
 
+  @NotNull
+  public File getShallowFile() {
+    return file(myShallow);
+  }
+
   @NotNull
   private static File file(@NotNull String filePath) {
     return new File(FileUtil.toSystemDependentName(filePath));

plugins/git4idea/src/git4idea/repo/GitRepositoryImpl.java

@@ -210,12 +210,13 @@ public class GitRepositoryImpl extends RepositoryImpl implements GitRepository {
     GitConfig config = GitConfig.read(configFile);
     Collection<GitRemote> remotes = config.parseRemotes();
     GitBranchState state = myReader.readState(remotes);
+    boolean isShallow = myReader.hasShallowCommits();
     Collection<GitBranchTrackInfo> trackInfos = config.parseTrackInfos(state.getLocalBranches().keySet(), state.getRemoteBranches().keySet());
     GitHooksInfo hooksInfo = myReader.readHooksInfo();
     Collection<GitSubmoduleInfo> submodules = new GitModulesFileReader().read(getSubmoduleFile());
     sw.report();
     return new GitRepoInfo(state.getCurrentBranch(), state.getCurrentRevision(), state.getState(), remotes,
-                           state.getLocalBranches(), state.getRemoteBranches(), trackInfos, submodules, hooksInfo);
+                           state.getLocalBranches(), state.getRemoteBranches(), trackInfos, submodules, hooksInfo, isShallow);
   }
 
   @NotNull

plugins/git4idea/src/git4idea/repo/GitRepositoryReader.java

@@ -103,6 +103,15 @@ class GitRepositoryReader {
     return file.exists() && file.canExecute();
   }
 
+  boolean hasShallowCommits() {
+    File shallowFile = myGitFiles.getShallowFile();
+    if (!shallowFile.exists()) {
+      return false;
+    }
+
+    return shallowFile.length() > 0;
+  }
+
   @Nullable
   private static String getCurrentRevision(@NotNull HeadInfo headInfo, @Nullable Hash currentBranchHash) {
     String currentRevision;