[PATCH v3] Introduce core.initHook

@@ -332,7 +332,8 @@ static int run_init_hook(int reinit)
        argv[0] = init_hook;
        if (reinit)
                argv[1] = "reinit";
-       return run_command_v_opt(argv, 0);
+       return run_command_v_opt(argv, 0) ?
+               error("hook '%s' failed", init_hook) : 0;
 }


 Documentation/config.txt   |    5 +++++
 Documentation/git-init.txt |    6 ++++++
 builtin-init-db.c          |   29 +++++++++++++++++++++++++++++
 t/t0001-init.sh            |   21 +++++++++++++++++++++
 4 files changed, 61 insertions(+), 0 deletions(-)

@@ -358,6 +358,11 @@ core.whitespace::
   does not trigger if the character before such a carriage-return
   is not a whitespace (not enabled by default).
 
+core.inithook::
+	The path to a program which is run after each call to
+	linkgit:git-init[1].  The hook is called with the argument
+	"reinit" if an existing repository is re-initialized.
+
 alias.*::
 	Command aliases for the linkgit:git[1] command wrapper - e.g.
 	after defining "alias.last = cat-file commit HEAD", the invocation

@@ -60,6 +60,12 @@ If you are initializing a non-bare repository, the config variable
 `receive.guardCurrentBranch` is set to true.  This avoids problems with
 pushing into the current branch, which does not touch the working tree.
 
+If you want to run a specific script everytime git-init was issued, you
+can set the variable `core.initHook` in /etc/gitconfig or $HOME/.gitconfig,
+or in the existing repository when re-initializing.  In the case that you
+reinitialize a repository, the hook is called with the single argument
+"reinit".
+
 --
 
 

@@ -6,6 +6,7 @@
 #include "cache.h"
 #include "builtin.h"
 #include "exec_cmd.h"
+#include "run-command.h"
 
 #ifndef DEFAULT_GIT_TEMPLATE_DIR
 #define DEFAULT_GIT_TEMPLATE_DIR "/usr/share/git-core/templates"

@@ -310,6 +311,31 @@ static void guess_repository_type(const char *git_dir)
 	return;
 }
 
+static const char *init_hook;
+static int config_init_hook(const char *key, const char *value)
+{
+	if (!strcmp(key, "core.inithook"))
+		return git_config_string(&init_hook, key, value);
+	return 0;
+}
+
+static int run_init_hook(int reinit)
+{
+	const char *argv[3] = { NULL, NULL, NULL };
+
+	git_config(config_init_hook);
+	if (!init_hook)
+		return 0;
+	if (access(init_hook, X_OK) < 0)
+		return error("init hook '%s' not found", init_hook);
+
+	argv[0] = init_hook;
+	if (reinit)
+		argv[1] = "reinit";
+	return run_command_v_opt(argv, 0) ?
+		error("hook '%s' failed", init_hook) : 0;
+}
+
 static const char init_db_usage[] =
 "git-init [-q | --quiet] [--template=<template-directory>] [--shared]";
 

@@ -407,6 +433,9 @@ int cmd_init_db(int argc, const char **argv, const char *prefix)
 		git_config_set("receive.denyNonFastforwards", "true");
 	}
 
+	if (run_init_hook(reinit))
+		return 1;
+
 	if (!quiet)
 		printf("%s%s Git repository in %s/\n",
 		       reinit ? "Reinitialized existing" : "Initialized empty",

@@ -113,4 +113,25 @@ test_expect_success 'GIT_DIR & GIT_WORK_TREE (2)' '
 	fi
 '
 
+cat > init-hook.sh << EOF
+#!$SHELL_PATH
+
+git config test.message success
+EOF
+chmod a+x init-hook.sh
+
+# using reinit because of lacking system/global config in the tests
+
+test_expect_success 'core.initHook' '
+
+	mkdir hook &&
+	(cd hook &&
+	 git init &&
+	 test -z "$(git config test.message)" &&
+	 git config core.initHook "$(pwd)"/../init-hook.sh &&
+	 git init &&
+	 test success = "$(git config test.message)")
+
+'
+
 test_done