git/shell.c
Dmitry Potapov 5b8e6f85f9 shrink git-shell by avoiding redundant dependencies
A lot of modules that have nothing to do with git-shell functionality
were linked in, bloating git-shell more than 8 times.

This patch cuts off redundant dependencies by:
1. providing stubs for three functions that make no sense for git-shell;
2. moving quote_path_fully from environment.c to quote.c to make the
   later self sufficient;
3. moving make_absolute_path into a new separate file.

The following numbers have been received with the default optimization
settings on master using GCC 4.1.2:

Before:
   text    data     bss     dec     hex filename
 143915    1348   93168  238431   3a35f git-shell

After:
   text    data     bss     dec     hex filename
  17670     788    8232   26690    6842 git-shell

Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-06-27 23:22:00 -07:00

98 lines
2.1 KiB
C

#include "cache.h"
#include "quote.h"
#include "exec_cmd.h"
#include "strbuf.h"
/* Stubs for functions that make no sense for git-shell. These stubs
* are provided here to avoid linking in external redundant modules.
*/
void release_pack_memory(size_t need, int fd){}
void trace_argv_printf(const char **argv, const char *fmt, ...){}
void trace_printf(const char *fmt, ...){}
static int do_generic_cmd(const char *me, char *arg)
{
const char *my_argv[4];
setup_path(NULL);
if (!arg || !(arg = sq_dequote(arg)))
die("bad argument");
if (prefixcmp(me, "git-"))
die("bad command");
my_argv[0] = me + 4;
my_argv[1] = arg;
my_argv[2] = NULL;
return execv_git_cmd(my_argv);
}
static int do_cvs_cmd(const char *me, char *arg)
{
const char *cvsserver_argv[3] = {
"cvsserver", "server", NULL
};
if (!arg || strcmp(arg, "server"))
die("git-cvsserver only handles server: %s", arg);
setup_path(NULL);
return execv_git_cmd(cvsserver_argv);
}
static struct commands {
const char *name;
int (*exec)(const char *me, char *arg);
} cmd_list[] = {
{ "git-receive-pack", do_generic_cmd },
{ "git-upload-pack", do_generic_cmd },
{ "cvs", do_cvs_cmd },
{ NULL },
};
int main(int argc, char **argv)
{
char *prog;
struct commands *cmd;
/*
* Special hack to pretend to be a CVS server
*/
if (argc == 2 && !strcmp(argv[1], "cvs server"))
argv--;
/*
* We do not accept anything but "-c" followed by "cmd arg",
* where "cmd" is a very limited subset of git commands.
*/
else if (argc != 3 || strcmp(argv[1], "-c"))
die("What do you think I am? A shell?");
prog = argv[2];
if (!strncmp(prog, "git", 3) && isspace(prog[3]))
/* Accept "git foo" as if the caller said "git-foo". */
prog[3] = '-';
for (cmd = cmd_list ; cmd->name ; cmd++) {
int len = strlen(cmd->name);
char *arg;
if (strncmp(cmd->name, prog, len))
continue;
arg = NULL;
switch (prog[len]) {
case '\0':
arg = NULL;
break;
case ' ':
arg = prog + len + 1;
break;
default:
continue;
}
exit(cmd->exec(cmd->name, arg));
}
die("unrecognized command '%s'", prog);
}