Use git config file for committer name and email info

This starts using the "user.name" and "user.email" config variables if
they exist as the default name and email when committing.  This means
that you don't have to use the GIT_COMMITTER_EMAIL environment variable
to override your email - you can just edit the config file instead.

The patch looks bigger than it is because it makes the default name and
email information non-static and renames it appropriately.  And it moves
the common git environment variables into a new library file, so that
you can link against libgit.a and get the git environment without having
to link in zlib and libcrypt.

In short, most of it is renaming and moving, the real change core is
just a few new lines in "git_default_config()" that copies the user
config values to the new base.

It also changes "git-var -l" to list the config variables.

Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>

9 files changed, 118 insertions, 78 deletions

diff --git a/Makefile b/Makefile
index d345c5d11..5e7d0555e 100644
--- a/Makefile
+++ b/Makefile
@@ -158,7 +158,7 @@ LIB_OBJS = \
 	object.o pack-check.o patch-delta.o path.o pkt-line.o \
 	quote.o read-cache.o refs.o run-command.o \
 	server-info.o setup.o sha1_file.o sha1_name.o strbuf.o \
-	tag.o tree.o usage.o config.o $(DIFF_OBJS)
+	tag.o tree.o usage.o config.o environment.o $(DIFF_OBJS)
 
 LIBS = $(LIB_FILE)
 LIBS += -lz
diff --git a/cache.h b/cache.h
index 41cc22c1a..1a7e047d7 100644
--- a/cache.h
+++ b/cache.h
@@ -382,4 +382,8 @@ extern int git_config(config_fn_t fn);
 extern int git_config_int(const char *, const char *);
 extern int git_config_bool(const char *, const char *);
 
+#define MAX_GITNAME (1000)
+extern char git_default_email[MAX_GITNAME];
+extern char git_default_name[MAX_GITNAME];
+
 #endif /* CACHE_H */
diff --git a/commit-tree.c b/commit-tree.c
index b1ef0b590..030fb704e 100644
--- a/commit-tree.c
+++ b/commit-tree.c
@@ -89,6 +89,9 @@ int main(int argc, char **argv)
 	char *buffer;
 	unsigned int size;
 
+	setup_ident();
+	git_config(git_default_config);
+
 	if (argc < 2 || get_sha1_hex(argv[1], tree_sha1) < 0)
 		usage(commit_tree_usage);
 
@@ -104,7 +107,6 @@ int main(int argc, char **argv)
 	}
 	if (!parents)
 		fprintf(stderr, "Committing initial tree %s\n", argv[1]);
-	setup_ident();
 
 	init_buffer(&buffer, &size);
 	add_buffer(&buffer, &size, "tree %s\n", sha1_to_hex(tree_sha1));
diff --git a/config.c b/config.c
index 510456ceb..cf803580c 100644
--- a/config.c
+++ b/config.c
@@ -207,6 +207,16 @@ int git_default_config(const char *var, const char *value)
 		return 0;
 	}
 
+	if (!strcmp(var, "user.name")) {
+		strncpy(git_default_name, value, sizeof(git_default_name));
+		return 0;
+	}
+
+	if (!strcmp(var, "user.email")) {
+		strncpy(git_default_email, value, sizeof(git_default_email));
+		return 0;
+	}
+
 	/* Add other config variables here.. */
 	return 0;
 }
diff --git a/environment.c b/environment.c
new file mode 100644
index 000000000..1dc7af56c
--- /dev/null
+++ b/environment.c
@@ -0,0 +1,75 @@
+/*
+ * We put all the git config variables in this same object
+ * file, so that programs can link against the config parser
+ * without having to link against all the rest of git.
+ *
+ * In particular, no need to bring in libz etc unless needed,
+ * even if you might want to know where the git directory etc
+ * are.
+ */
+#include "cache.h"
+
+char git_default_email[MAX_GITNAME];
+char git_default_name[MAX_GITNAME];
+int trust_executable_bit = 1;
+
+static char *git_dir, *git_object_dir, *git_index_file, *git_refs_dir,
+	*git_graft_file;
+static void setup_git_env(void)
+{
+	git_dir = getenv(GIT_DIR_ENVIRONMENT);
+	if (!git_dir)
+		git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
+	git_object_dir = getenv(DB_ENVIRONMENT);
+	if (!git_object_dir) {
+		git_object_dir = xmalloc(strlen(git_dir) + 9);
+		sprintf(git_object_dir, "%s/objects", git_dir);
+	}
+	git_refs_dir = xmalloc(strlen(git_dir) + 6);
+	sprintf(git_refs_dir, "%s/refs", git_dir);
+	git_index_file = getenv(INDEX_ENVIRONMENT);
+	if (!git_index_file) {
+		git_index_file = xmalloc(strlen(git_dir) + 7);
+		sprintf(git_index_file, "%s/index", git_dir);
+	}
+	git_graft_file = getenv(GRAFT_ENVIRONMENT);
+	if (!git_graft_file)
+		git_graft_file = strdup(git_path("info/grafts"));
+}
+
+char *get_git_dir(void)
+{
+	if (!git_dir)
+		setup_git_env();
+	return git_dir;
+}
+
+char *get_object_directory(void)
+{
+	if (!git_object_dir)
+		setup_git_env();
+	return git_object_dir;
+}
+
+char *get_refs_directory(void)
+{
+	if (!git_refs_dir)
+		setup_git_env();
+	return git_refs_dir;
+}
+
+char *get_index_file(void)
+{
+	if (!git_index_file)
+		setup_git_env();
+	return git_index_file;
+}
+
+char *get_graft_file(void)
+{
+	if (!git_graft_file)
+		setup_git_env();
+	return git_graft_file;
+}
+
+
diff --git a/ident.c b/ident.c
index 562f5f181..7a9f5672e 100644
--- a/ident.c
+++ b/ident.c
@@ -11,9 +11,7 @@
 #include <time.h>
 #include <ctype.h>
 
-static char real_email[1000];
-static char real_name[1000];
-static char real_date[50];
+static char git_default_date[50];
 
 static void copy_gecos(struct passwd *w, char *name, int sz)
 {
@@ -58,22 +56,22 @@ int setup_ident(void)
 		die("You don't exist. Go away!");
 
 	/* Get the name ("gecos") */
-	copy_gecos(pw, real_name, sizeof(real_name));
+	copy_gecos(pw, git_default_name, sizeof(git_default_name));
 
 	/* Make up a fake email address (name + '@' + hostname [+ '.' + domainname]) */
 	len = strlen(pw->pw_name);
-	if (len > sizeof(real_email)/2)
+	if (len > sizeof(git_default_email)/2)
 		die("Your sysadmin must hate you!");
-	memcpy(real_email, pw->pw_name, len);
-	real_email[len++] = '@';
-	gethostname(real_email + len, sizeof(real_email) - len);
-	if (!strchr(real_email+len, '.')) {
-		len = strlen(real_email);
-		real_email[len++] = '.';
-		getdomainname(real_email+len, sizeof(real_email)-len);
+	memcpy(git_default_email, pw->pw_name, len);
+	git_default_email[len++] = '@';
+	gethostname(git_default_email + len, sizeof(git_default_email) - len);
+	if (!strchr(git_default_email+len, '.')) {
+		len = strlen(git_default_email);
+		git_default_email[len++] = '.';
+		getdomainname(git_default_email+len, sizeof(git_default_email)-len);
 	}
 	/* And set the default date */
-	datestamp(real_date, sizeof(real_date));
+	datestamp(git_default_date, sizeof(git_default_date));
 	return 0;
 }
 
@@ -159,10 +157,10 @@ char *get_ident(const char *name, const char *email, const char *date_str)
 	int i;
 
 	if (!name)
-		name = real_name;
+		name = git_default_name;
 	if (!email)
-		email = real_email;
-	strcpy(date, real_date);
+		email = git_default_email;
+	strcpy(date, git_default_date);
 	if (date_str)
 		parse_date(date_str, date, sizeof(date));
 
diff --git a/read-cache.c b/read-cache.c
index 4ed369acf..693273620 100644
--- a/read-cache.c
+++ b/read-cache.c
@@ -5,7 +5,6 @@
  */
 #include "cache.h"
 
-int trust_executable_bit = 1;
 struct cache_entry **active_cache = NULL;
 unsigned int active_nr = 0, active_alloc = 0, active_cache_changed = 0;
 
diff --git a/sha1_file.c b/sha1_file.c
index 6e3ea232e..f05900490 100644
--- a/sha1_file.c
+++ b/sha1_file.c
@@ -48,65 +48,6 @@ int get_sha1_hex(const char *hex, unsigned char *sha1)
 	return 0;
 }
 
-static char *git_dir, *git_object_dir, *git_index_file, *git_refs_dir,
-	*git_graft_file;
-static void setup_git_env(void)
-{
-	git_dir = getenv(GIT_DIR_ENVIRONMENT);
-	if (!git_dir)
-		git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
-	git_object_dir = getenv(DB_ENVIRONMENT);
-	if (!git_object_dir) {
-		git_object_dir = xmalloc(strlen(git_dir) + 9);
-		sprintf(git_object_dir, "%s/objects", git_dir);
-	}
-	git_refs_dir = xmalloc(strlen(git_dir) + 6);
-	sprintf(git_refs_dir, "%s/refs", git_dir);
-	git_index_file = getenv(INDEX_ENVIRONMENT);
-	if (!git_index_file) {
-		git_index_file = xmalloc(strlen(git_dir) + 7);
-		sprintf(git_index_file, "%s/index", git_dir);
-	}
-	git_graft_file = getenv(GRAFT_ENVIRONMENT);
-	if (!git_graft_file)
-		git_graft_file = strdup(git_path("info/grafts"));
-}
-
-char *get_git_dir(void)
-{
-	if (!git_dir)
-		setup_git_env();
-	return git_dir;
-}
-
-char *get_object_directory(void)
-{
-	if (!git_object_dir)
-		setup_git_env();
-	return git_object_dir;
-}
-
-char *get_refs_directory(void)
-{
-	if (!git_refs_dir)
-		setup_git_env();
-	return git_refs_dir;
-}
-
-char *get_index_file(void)
-{
-	if (!git_index_file)
-		setup_git_env();
-	return git_index_file;
-}
-
-char *get_graft_file(void)
-{
-	if (!git_graft_file)
-		setup_git_env();
-	return git_graft_file;
-}
-
 int safe_create_leading_directories(char *path)
 {
 	char *pos = path;
diff --git a/var.c b/var.c
index 3f13126cb..51cf86a58 100644
--- a/var.c
+++ b/var.c
@@ -42,6 +42,15 @@ static const char *read_var(const char *var)
 	return val;
 }
 
+static int show_config(const char *var, const char *value)
+{
+	if (value)
+		printf("%s=%s\n", var, value);
+	else
+		printf("%s\n", var);
+	return git_default_config(var, value);
+}
+
 int main(int argc, char **argv)
 {
 	const char *val;
@@ -52,9 +61,11 @@ int main(int argc, char **argv)
 	val = NULL;
 
 	if (strcmp(argv[1], "-l") == 0) {
+		git_config(show_config);
 		list_vars();
 		return 0;
 	}
+	git_config(git_default_config);
 	val = read_var(argv[1]);
 	if (!val)
 		usage(var_usage);