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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"
#ifndef PATH_MAX
# define PATH_MAX 4096
#endif
static const char git_usage[] =
"Usage: git [--version] [--exec-path[=GIT_EXEC_PATH]] [--help] COMMAND [ ARGS ]";
/* most gui terms set COLUMNS (although some don't export it) */
static int term_columns(void)
{
char *col_string = getenv("COLUMNS");
int n_cols = 0;
if (col_string && (n_cols = atoi(col_string)) > 0)
return n_cols;
return 80;
}
static void oom(void)
{
fprintf(stderr, "git: out of memory\n");
exit(1);
}
static inline void mput_char(char c, unsigned int num)
{
while(num--)
putchar(c);
}
static struct cmdname {
size_t len;
char name[1];
} **cmdname;
static int cmdname_alloc, cmdname_cnt;
static void add_cmdname(const char *name, int len)
{
struct cmdname *ent;
if (cmdname_alloc <= cmdname_cnt) {
cmdname_alloc = cmdname_alloc + 200;
cmdname = realloc(cmdname, cmdname_alloc * sizeof(*cmdname));
if (!cmdname)
oom();
}
ent = malloc(sizeof(*ent) + len);
if (!ent)
oom();
ent->len = len;
memcpy(ent->name, name, len);
ent->name[len] = 0;
cmdname[cmdname_cnt++] = ent;
}
static int cmdname_compare(const void *a_, const void *b_)
{
struct cmdname *a = *(struct cmdname **)a_;
struct cmdname *b = *(struct cmdname **)b_;
return strcmp(a->name, b->name);
}
static void pretty_print_string_list(struct cmdname **cmdname, int longest)
{
int cols = 1;
int space = longest + 1; /* min 1 SP between words */
int max_cols = term_columns() - 1; /* don't print *on* the edge */
int i;
if (space < max_cols)
cols = max_cols / space;
qsort(cmdname, cmdname_cnt, sizeof(*cmdname), cmdname_compare);
for (i = 0; i < cmdname_cnt; ) {
int c;
printf(" ");
for (c = cols; c && i < cmdname_cnt; i++) {
printf("%s", cmdname[i]->name);
if (--c)
mput_char(' ', space - cmdname[i]->len);
}
putchar('\n');
}
}
static void list_commands(const char *exec_path, const char *pattern)
{
unsigned int longest = 0;
char path[PATH_MAX];
int dirlen;
DIR *dir = opendir(exec_path);
struct dirent *de;
if (!dir) {
fprintf(stderr, "git: '%s': %s\n", exec_path, strerror(errno));
exit(1);
}
dirlen = strlen(exec_path);
if (PATH_MAX - 20 < dirlen) {
fprintf(stderr, "git: insanely long exec-path '%s'\n",
exec_path);
exit(1);
}
memcpy(path, exec_path, dirlen);
path[dirlen++] = '/';
while ((de = readdir(dir)) != NULL) {
struct stat st;
int entlen;
if (strncmp(de->d_name, "git-", 4))
continue;
strcpy(path+dirlen, de->d_name);
if (stat(path, &st) || /* stat, not lstat */
!S_ISREG(st.st_mode) ||
!(st.st_mode & S_IXUSR))
continue;
entlen = strlen(de->d_name);
if (4 < entlen && !strcmp(de->d_name + entlen - 4, ".exe"))
entlen -= 4;
if (longest < entlen)
longest = entlen;
add_cmdname(de->d_name + 4, entlen-4);
}
closedir(dir);
printf("git commands available in '%s'\n", exec_path);
printf("----------------------------");
mput_char('-', strlen(exec_path));
putchar('\n');
pretty_print_string_list(cmdname, longest - 4);
putchar('\n');
}
#ifdef __GNUC__
static void cmd_usage(const char *exec_path, const char *fmt, ...)
__attribute__((__format__(__printf__, 2, 3), __noreturn__));
#endif
static void cmd_usage(const char *exec_path, const char *fmt, ...)
{
if (fmt) {
va_list ap;
va_start(ap, fmt);
printf("git: ");
vprintf(fmt, ap);
va_end(ap);
putchar('\n');
}
else
puts(git_usage);
putchar('\n');
if(exec_path)
list_commands(exec_path, "git-*");
exit(1);
}
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);
}
static void show_man_page(char *git_cmd)
{
char *page;
if (!strncmp(git_cmd, "git", 3))
page = git_cmd;
else {
int page_len = strlen(git_cmd) + 4;
page = malloc(page_len + 1);
strcpy(page, "git-");
strcpy(page + 4, git_cmd);
page[page_len] = 0;
}
execlp("man", "man", page, NULL);
}
int main(int argc, char **argv, char **envp)
{
char git_command[PATH_MAX + 1];
char wd[PATH_MAX + 1];
int i, len, show_help = 0;
char *exec_path = getenv("GIT_EXEC_PATH");
getcwd(wd, PATH_MAX);
if (!exec_path)
exec_path = GIT_EXEC_PATH;
for (i = 1; i < argc; i++) {
char *arg = argv[i];
if (strncmp(arg, "--", 2))
break;
arg += 2;
if (!strncmp(arg, "exec-path", 9)) {
arg += 9;
if (*arg == '=')
exec_path = arg + 1;
else {
puts(exec_path);
exit(0);
}
}
else if (!strcmp(arg, "version")) {
printf("git version %s\n", GIT_VERSION);
exit(0);
}
else if (!strcmp(arg, "help"))
show_help = 1;
else if (!show_help)
cmd_usage(NULL, NULL);
}
if (i >= argc || show_help) {
if (i >= argc)
cmd_usage(exec_path, NULL);
show_man_page(argv[i]);
}
if (*exec_path != '/') {
if (!getcwd(git_command, sizeof(git_command))) {
fprintf(stderr,
"git: cannot determine current directory");
exit(1);
}
len = strlen(git_command);
/* Trivial cleanup */
while (!strncmp(exec_path, "./", 2)) {
exec_path += 2;
while (*exec_path == '/')
exec_path++;
}
snprintf(git_command + len, sizeof(git_command) - len,
"/%s", exec_path);
}
else
strcpy(git_command, exec_path);
len = strlen(git_command);
prepend_to_path(git_command, len);
len += snprintf(git_command + len, sizeof(git_command) - len,
"/git-%s", argv[i]);
if (sizeof(git_command) <= len) {
fprintf(stderr, "git: command name given is too long.\n");
exit(1);
}
/* execve() can only ever return if it fails */
execve(git_command, &argv[i], envp);
if (errno == ENOENT)
cmd_usage(exec_path, "'%s' is not a git-command", argv[i]);
fprintf(stderr, "Failed to run command '%s': %s\n",
git_command, strerror(errno));
return 1;
}
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