exec_cmd.c

   1 #include "cache.h"
   2 #include "exec_cmd.h"
   3 #include "quote.h"
   4 #define MAX_ARGS        32
   5
   6 extern char **environ;
   7 static const char *argv_exec_path;
   8 static const char *argv0_path;
   9
  10 static const char *builtin_exec_path(void)
  11 {
  12 #ifndef __MINGW32__
  13         return GIT_EXEC_PATH;
  14 #else
  15         int len;
  16         char *p, *q, *sl;
  17         static char *ep;
  18         if (ep)
  19                 return ep;
  20
  21         len = strlen(_pgmptr);
  22         if (len < 2)
  23                 return ep = ".";
  24
  25         p = ep = xmalloc(len+1);
  26         q = _pgmptr;
  27         sl = NULL;
  28         /* copy program name, turn '\\' into '/', skip last part */
  29         while ((*p = *q)) {
  30                 if (*q == '\\' || *q == '/') {
  31                         *p = '/';
  32                         sl = p;
  33                 }
  34                 p++, q++;
  35         }
  36         if (sl)
  37                 *sl = '\0';
  38         else
  39                 ep[0] = '.', ep[1] = '\0';
  40         return ep;
  41 #endif
  42 }
  43
  44 const char *system_path(const char *path)
  45 {
  46         if (!is_absolute_path(path)) {
  47                 struct strbuf d = STRBUF_INIT;
  48                 strbuf_addf(&d, "%s/%s", git_exec_path(), path);
  49                 path = strbuf_detach(&d, NULL);
  50         }
  51         return path;
  52 }
  53
  54 void git_set_argv0_path(const char *path)
  55 {
  56         argv0_path = path;
  57 }
  58
  59 void git_set_argv_exec_path(const char *exec_path)
  60 {
  61         argv_exec_path = exec_path;
  62 }
  63
  64
  65 /* Returns the highest-priority, location to look for git programs. */
  66 const char *git_exec_path(void)
  67 {
  68         const char *env;
  69
  70         if (argv_exec_path)
  71                 return argv_exec_path;
  72
  73         env = getenv(EXEC_PATH_ENVIRONMENT);
  74         if (env && *env) {
  75                 return env;
  76         }
  77
  78         return builtin_exec_path();
  79 }
  80
  81 static void add_path(struct strbuf *out, const char *path)
  82 {
  83         if (path && *path) {
  84                 if (is_absolute_path(path))
  85                         strbuf_addstr(out, path);
  86                 else
  87                         strbuf_addstr(out, make_absolute_path(path));
  88
  89                 strbuf_addch(out, PATH_SEP);
  90         }
  91 }
  92
  93 void setup_path(void)
  94 {
  95         const char *old_path = getenv("PATH");
  96         struct strbuf new_path;
  97
  98         strbuf_init(&new_path, 0);
  99
 100         add_path(&new_path, argv_exec_path);
 101         add_path(&new_path, getenv(EXEC_PATH_ENVIRONMENT));
 102         add_path(&new_path, builtin_exec_path());
 103         add_path(&new_path, argv0_path);
 104
 105         if (old_path)
 106                 strbuf_addstr(&new_path, old_path);
 107         else
 108                 strbuf_addstr(&new_path, "/usr/local/bin:/usr/bin:/bin");
 109
 110         setenv("PATH", new_path.buf, 1);
 111
 112         strbuf_release(&new_path);
 113 }
 114
 115 int execv_git_cmd(const char **argv)
 116 {
 117         int argc;
 118         const char **nargv;
 119
 120         for (argc = 0; argv[argc]; argc++)
 121                 ; /* just counting */
 122         nargv = xmalloc(sizeof(*nargv) * (argc + 2));
 123
 124         nargv[0] = "git";
 125         for (argc = 0; argv[argc]; argc++)
 126                 nargv[argc + 1] = argv[argc];
 127         nargv[argc + 1] = NULL;
 128         trace_argv_printf(nargv, "trace: exec:");
 129
 130         /* execvp() can only ever return if it fails */
 131         execvp("git", (char **)nargv);
 132
 133         trace_printf("trace: exec failed: %s\n", strerror(errno));
 134
 135         free(nargv);
 136         return -1;
 137 }
 138
 139
 140 int execl_git_cmd(const char *cmd,...)
 141 {
 142         int argc;
 143         const char *argv[MAX_ARGS + 1];
 144         const char *arg;
 145         va_list param;
 146
 147         va_start(param, cmd);
 148         argv[0] = cmd;
 149         argc = 1;
 150         while (argc < MAX_ARGS) {
 151                 arg = argv[argc++] = va_arg(param, char *);
 152                 if (!arg)
 153                         break;
 154         }
 155         va_end(param);
 156         if (MAX_ARGS <= argc)
 157                 return error("too many args to run %s", cmd);
 158
 159         argv[argc] = NULL;
 160         return execv_git_cmd(argv);
 161 }