Add support for GIT_CEILING_DIRS

From: David Reiss <[email protected]>
Date: Sun, 20 Apr 2008 12:27:52 -0700
Subject: [PATCH] chdir after computing new cwd in check_repository_format_gently

In preparation for adding a check before the chdir. This should be a no-op because the cwd is not read in the interim and any nonlocal exits either chdir to an absolute path or die.

---
 setup.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

index 3d2d958..a7b7f56 100644
@@ -396,7 +396,6 @@ const char *setup_git_directory_gently(int *nongit_ok)
 			check_repository_format_gently(nongit_ok);
 			return NULL;
 		}
-		chdir("..");
 		do {
 			if (!offset) {
 				if (nongit_ok) {

@@ -408,6 +407,7 @@ const char *setup_git_directory_gently(int *nongit_ok)
 				die("Not a git repository");
 			}
 		} while (cwd[--offset] != '/');
+		chdir("..");
 	}
 
 	inside_git_dir = 0;

1.5.4

From: David Reiss <[email protected]>
Date: Sun, 20 Apr 2008 22:54:11 -0700
Subject: [PATCH] Add support for GIT_CEILING_DIRS

Make git recognize a new environment variable that prevents it from chdir'ing up into specified directories when looking for a GIT_DIR. Useful for avoiding slow network directories.

---
Just a bit of context about the motivation for this. I use git in an environment where homedirs are automounted and "ls /home/nonexistent" takes about 9 seconds. I use the git bash completion, which runs "git help -a". As of Git 1.5.5, this calls setup_git_directory_gently, which searches /home/.git and /home/objects, which takes forever, delaying all of my logins. This patch lets me set "GIT_CEILING_DIRS=/home", which makes this operation fast. As a bonus, the "git symbolic-ref HEAD" in my shell prompt now works quickly when I'm in a non-git directory.

 Documentation/git.txt   |    8 ++++
 cache.h                 |    1 +
 setup.c                 |   67 +++++++++++++++++++++++++-----
 t/t1503-ceiling-dirs.sh |  104 +++++++++++++++++++++++++++++++++++++++++++++++
 t/test-lib.sh           |    1 +
 5 files changed, 170 insertions(+), 11 deletions(-)
 create mode 100755 t/t1503-ceiling-dirs.sh

index 336fe99..cc52f6e 100644
@@ -406,6 +406,14 @@ git so take care if using Cogito etc.
 	This can also be controlled by the '--work-tree' command line
 	option and the core.worktree configuration variable.
 
+'GIT_CEILING_DIRS'::
+	This should be a colon-separated list of absolute paths.
+	If set, it is a list of directories that git should not chdir
+	up into while looking for a repository directory.
+	It will not exclude the current working directory or
+	a GIT_DIR set on the command line or in the environment.
+	(Useful for excluding slow-loading network directories.)
+
 git Commits
 ~~~~~~~~~~~
 'GIT_AUTHOR_NAME'::

index 50b28fa..e5e3dba 100644
@@ -295,6 +295,7 @@ static inline enum object_type object_type(unsigned int mode)
 #define CONFIG_ENVIRONMENT "GIT_CONFIG"
 #define CONFIG_LOCAL_ENVIRONMENT "GIT_CONFIG_LOCAL"
 #define EXEC_PATH_ENVIRONMENT "GIT_EXEC_PATH"
+#define CEILING_DIRS_ENVIRONMENT "GIT_CEILING_DIRS"
 #define GITATTRIBUTES_FILE ".gitattributes"
 #define INFOATTRIBUTES_FILE "info/attributes"
 #define ATTRIBUTE_MACRO_PREFIX "[attr]"

index 7c2a8ba..22899c1 100644
@@ -35,6 +35,7 @@ unset GIT_WORK_TREE
 unset GIT_EXTERNAL_DIFF
 unset GIT_INDEX_FILE
 unset GIT_OBJECT_DIRECTORY
+unset GIT_CEILING_DIRS
 unset SHA1_FILE_DIRECTORIES
 unset SHA1_FILE_DIRECTORY
 GIT_MERGE_VERBOSITY=5

1.5.4