Enable reflogs by default in any repository with a working directory.

New and experienced Git users alike are finding out too late that
they forgot to enable reflogs in the current repository, and cannot
use the information stored within it to recover from an incorrectly
entered command such as `git reset --hard HEAD^^^` when they really
meant HEAD^^ (aka HEAD~2).

So enable reflogs by default in all future versions of Git, unless
the user specifically disables it with:

  [core]
    logAllRefUpdates = false

in their .git/config or ~/.gitconfig.

We only enable reflogs in repositories that have a working directory
associated with them, as shared/bare repositories do not have
an easy means to prune away old log entries, or may fail logging
entirely if the user's gecos information is not valid during a push.
This heuristic was suggested on the mailing list by Junio.

Documentation was also updated to indicate the new default behavior.
We probably should start to teach usuing the reflog to recover
from mistakes in some of the tutorial material, as new users are
likely to make a few along the way and will feel better knowing
they can recover from them quickly and easily, without fsck-objects'
lost+found features.

Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>

5 files changed, 21 insertions, 4 deletions

diff --git a/Documentation/config.txt b/Documentation/config.txt
index a3587f8..8abb082 100644
--- a/Documentation/config.txt
+++ b/Documentation/config.txt
@@ -79,8 +79,11 @@ core.logAllRefUpdates::
 	file is automatically created for branch heads.
 
 	This information can be used to determine what commit
-	was the tip of a branch "2 days ago".  This value is
-	false by default (no automated creation of log files).
+	was the tip of a branch "2 days ago".
+
+	This value is true by default in a repository that has
+	a working directory associated with it, and false by
+	default in a bare repository.
 
 core.repositoryFormatVersion::
 	Internal variable identifying the repository format and layout
diff --git a/builtin-init-db.c b/builtin-init-db.c
index 8f2b750..1d7d15e 100644
--- a/builtin-init-db.c
+++ b/builtin-init-db.c
@@ -242,6 +242,9 @@ static int create_default_files(const char *git_dir, const char *template_path)
 			       filemode ? "true" : "false");
 	}
 
+	/* Enable logAllRefUpdates if a working tree is attached */
+	if (!is_bare_git_dir(git_dir))
+		git_config_set("core.logallrefupdates", "true");
 	return reinit;
 }
 
diff --git a/cache.h b/cache.h
index f2ec5c8..2d3df98 100644
--- a/cache.h
+++ b/cache.h
@@ -123,6 +123,7 @@ extern int cache_errno;
 #define INDEX_ENVIRONMENT "GIT_INDEX_FILE"
 #define GRAFT_ENVIRONMENT "GIT_GRAFT_FILE"
 
+extern int is_bare_git_dir(const char *dir);
 extern const char *get_git_dir(void);
 extern char *get_object_directory(void);
 extern char *get_refs_directory(void);
diff --git a/environment.c b/environment.c
index 84d870c..f8c7dbc 100644
--- a/environment.c
+++ b/environment.c
@@ -48,6 +48,16 @@ static void setup_git_env(void)
 	git_graft_file = getenv(GRAFT_ENVIRONMENT);
 	if (!git_graft_file)
 		git_graft_file = xstrdup(git_path("info/grafts"));
+	log_all_ref_updates = !is_bare_git_dir(git_dir);
+}
+
+int is_bare_git_dir (const char *dir)
+{
+	const char *s;
+	if (!strcmp(dir, DEFAULT_GIT_DIR_ENVIRONMENT))
+		return 0;
+	s = strrchr(dir, '/');
+	return !s || strcmp(s + 1, DEFAULT_GIT_DIR_ENVIRONMENT);
 }
 
 const char *get_git_dir(void)
diff --git a/t/t1400-update-ref.sh b/t/t1400-update-ref.sh
index 6a917f2..5637cb5 100755
--- a/t/t1400-update-ref.sh
+++ b/t/t1400-update-ref.sh
@@ -63,8 +63,8 @@ test_expect_failure \
 	"test $B"' = $(cat .git/'"$m"')'
 rm -f .git/$m
 
-mkdir -p .git/logs/refs/heads
-touch .git/logs/refs/heads/master
+: a repository with working tree always has reflog these days...
+: >.git/logs/refs/heads/master
 test_expect_success \
 	"create $m (logged by touch)" \
 	'GIT_COMMITTER_DATE="2005-05-26 23:30" \