[PATCH] Adding hooks.directory config option; wiring into run_hook

From: Christopher Dale <chrelad@gmail.com>
Date: Dec 16, 2011, 18:00 UTC
Message-ID: <CADQnX_e76LzuRUDOKFOsRHU=e8Cw+qh5x1BdW5HMEdMmP5PaHg@mail.gmail.com>

>From 92a34696bb4e76ae7a967666234f13d04858bb68 Mon Sep 17 00:00:00 2001

From: Christopher Dale <chrelad@gmail.com>
Date: Fri, 16 Dec 2011 10:55:26 -0600
Subject: [PATCH] Adding hooks.directory config option; wiring into run_hook

The new hooks.directory config option allows each git repository to specify the location of the hooks for that repository. The default remains $GIT_DIR/hooks. The ability to change the hooks directory is necessary when stuck in an environment with enhanced security and trusted path execution policies. These systems require that any file that can be executed exhibit at least the following characteristics:

  * The executable, it's directory, and each directory above it are
    not writable.

Since the hooks directory is within a directory that by it's very nature requires write permissions, hooks are a non-starter in git's current state. This patch aims to allow a (most likely bare) repo to have it's hooks directory customized to a location that meets the above requirements.

I'm not terribly good at C++, so please let me know if I need to fix
anything. I saw that there were a bunch of scripts that have
GIT_DIR/hooks hard-coded in them. Since I'm not familiar with those
scripts, I will leave them alone for now. Maybe someone that is familiar
with the scripts can integrate the new configuration option into them?
---
 Documentation/config.txt               |    5 +++++
 contrib/completion/git-completion.bash |    1 +
 run-command.c                          |   25 +++++++++++++++++++++++--
 3 files changed, 29 insertions(+), 2 deletions(-)

diff --git a/Documentation/config.txt b/Documentation/config.txt
index 8a7d2d4..c23417c 100644
--- a/Documentation/config.txt
+++ b/Documentation/config.txt
@@ -1226,6 +1226,11 @@ help.autocorrect::
        value is 0 - the command will be just shown but not executed.
        This is the default.

+hooks.directory::
+       Override the default hook directory location GIT_DIR/hooks. This can be
+       usefull if you are in an environment that has trusted path execution for
+       example.
+
 http.proxy::
        Override the HTTP proxy, normally configured using the 'http_proxy'
        environment variable (see linkgit:curl[1]).  This can be overridden
diff --git a/contrib/completion/git-completion.bash
b/contrib/completion/git-completion.bash
index cc1bdf9..066948e 100755
--- a/contrib/completion/git-completion.bash
+++ b/contrib/completion/git-completion.bash
@@ -2177,6 +2177,7 @@ _git_config ()
                help.autocorrect
                help.browser
                help.format
+               hooks.directory
                http.lowSpeedLimit
                http.lowSpeedTime
                http.maxRequests
diff --git a/run-command.c b/run-command.c
index 1c51043..2e5fa16 100644
--- a/run-command.c
+++ b/run-command.c
@@ -1,4 +1,5 @@
 #include "cache.h"
+#include "diff.h"
 #include "run-command.h"
 #include "exec_cmd.h"
 #include "argv-array.h"
@@ -65,6 +66,7 @@ static int execv_shell_cmd(const char **argv)
 #ifndef WIN32
 static int child_err = 2;
 static int child_notifier = -1;
+static const char *hook_directory = NULL;

 static void notify_parent(void)
 {
@@ -603,6 +605,14 @@ int finish_async(struct async *async)
 #endif
 }

+static int git_hook_config(const char *var, const char *value, void *cb)
+{
+       if (!strcmp(var, "hooks.directory"))
+               return git_config_pathname(&hook_directory, var, value);
+
+       return git_diff_ui_config(var, value, cb);
+}
+
 int run_hook(const char *index_file, const char *name, ...)
 {
        struct child_process hook;
@@ -612,11 +622,22 @@ int run_hook(const char *index_file, const char
*name, ...)
        va_list args;
        int ret;

-       if (access(git_path("hooks/%s", name), X_OK) < 0)
+       // If this is not reset to NULL, then strange stuff happens
+       hook_directory = NULL;
+
+       // Load the configuration for hooks.directory
+       git_config(git_hook_config, NULL);
+
+       // If the configuration is not set for hooks directory, set it to the
+       // default GIT_PATH/hooks directory that we all know and love.
+       if(hook_directory == NULL)
+               hook_directory = git_path("hooks");
+
+       if (access(mkpath("%s/%s", hook_directory, name), X_OK) < 0)
                return 0;

        va_start(args, name);
-       argv_array_push(&argv, git_path("hooks/%s", name));
+       argv_array_push(&argv, mkpath("%s/%s", hook_directory, name));
        while ((p = va_arg(args, const char *)))
                argv_array_push(&argv, p);
        va_end(args);

-- 
1.7.5.2.353.g5df3e