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#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <dirent.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <limits.h>
#include <stdarg.h>
#include "git-compat-util.h"
#include "exec_cmd.h"
#include "builtin.h"
static void prepend_to_path(const char *dir, int len)
{
char *path, *old_path = getenv("PATH");
int path_len = len;
if (!old_path)
old_path = "/usr/local/bin:/usr/bin:/bin";
path_len = len + strlen(old_path) + 1;
path = malloc(path_len + 1);
memcpy(path, dir, len);
path[len] = ':';
memcpy(path + len + 1, old_path, path_len - len);
setenv("PATH", path, 1);
}
const char git_version_string[] = GIT_VERSION;
static void handle_internal_command(int argc, const char **argv, char **envp)
{
const char *cmd = argv[0];
static struct cmd_struct {
const char *cmd;
int (*fn)(int, const char **, char **);
} commands[] = {
{ "version", cmd_version },
{ "help", cmd_help },
{ "log", cmd_log },
{ "whatchanged", cmd_whatchanged },
{ "show", cmd_show },
};
int i;
/* Turn "git cmd --help" into "git help cmd" */
if (argc > 1 && !strcmp(argv[1], "--help")) {
argv[1] = argv[0];
argv[0] = cmd = "help";
}
for (i = 0; i < ARRAY_SIZE(commands); i++) {
struct cmd_struct *p = commands+i;
if (strcmp(p->cmd, cmd))
continue;
exit(p->fn(argc, argv, envp));
}
}
int main(int argc, const char **argv, char **envp)
{
const char *cmd = argv[0];
char *slash = strrchr(cmd, '/');
char git_command[PATH_MAX + 1];
const char *exec_path = NULL;
/*
* Take the basename of argv[0] as the command
* name, and the dirname as the default exec_path
* if it's an absolute path and we don't have
* anything better.
*/
if (slash) {
*slash++ = 0;
if (*cmd == '/')
exec_path = cmd;
cmd = slash;
}
/*
* "git-xxxx" is the same as "git xxxx", but we obviously:
*
* - cannot take flags in between the "git" and the "xxxx".
* - cannot execute it externally (since it would just do
* the same thing over again)
*
* So we just directly call the internal command handler, and
* die if that one cannot handle it.
*/
if (!strncmp(cmd, "git-", 4)) {
cmd += 4;
argv[0] = cmd;
handle_internal_command(argc, argv, envp);
die("cannot handle %s internally", cmd);
}
/* Default command: "help" */
cmd = "help";
/* Look for flags.. */
while (argc > 1) {
cmd = *++argv;
argc--;
if (strncmp(cmd, "--", 2))
break;
cmd += 2;
/*
* For legacy reasons, the "version" and "help"
* commands can be written with "--" prepended
* to make them look like flags.
*/
if (!strcmp(cmd, "help"))
break;
if (!strcmp(cmd, "version"))
break;
/*
* Check remaining flags (which by now must be
* "--exec-path", but maybe we will accept
* other arguments some day)
*/
if (!strncmp(cmd, "exec-path", 9)) {
cmd += 9;
if (*cmd == '=') {
git_set_exec_path(cmd + 1);
continue;
}
puts(git_exec_path());
exit(0);
}
cmd_usage(0, NULL, NULL);
}
argv[0] = cmd;
/*
* We search for git commands in the following order:
* - git_exec_path()
* - the path of the "git" command if we could find it
* in $0
* - the regular PATH.
*/
if (exec_path)
prepend_to_path(exec_path, strlen(exec_path));
exec_path = git_exec_path();
prepend_to_path(exec_path, strlen(exec_path));
/* See if it's an internal command */
handle_internal_command(argc, argv, envp);
/* .. then try the external ones */
execv_git_cmd(argv);
if (errno == ENOENT)
cmd_usage(0, exec_path, "'%s' is not a git-command", cmd);
fprintf(stderr, "Failed to run command '%s': %s\n",
git_command, strerror(errno));
return 1;
}
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