exec_cmd.c

   1 #include "cache.h"
   2 #include "exec_cmd.h"
   3 #include "quote.h"
   4 #include "spawn-pipe.h"
   5 #define MAX_ARGS        32
   6
   7 extern char **environ;
   8 static const char *argv_exec_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 void git_set_argv_exec_path(const char *exec_path)
  45 {
  46         argv_exec_path = exec_path;
  47 }
  48
  49
  50 /* Returns the highest-priority, location to look for git programs. */
  51 const char *git_exec_path(void)
  52 {
  53         const char *env;
  54
  55         if (argv_exec_path)
  56                 return argv_exec_path;
  57
  58         env = getenv(EXEC_PATH_ENVIRONMENT);
  59         if (env && *env) {
  60                 return env;
  61         }
  62
  63         return builtin_exec_path();
  64 }
  65
  66 static void add_path(struct strbuf *out, const char *path)
  67 {
  68         if (path && *path) {
  69                 if (is_absolute_path(path))
  70                         strbuf_addstr(out, path);
  71                 else
  72                         strbuf_addstr(out, make_absolute_path(path));
  73
  74 #ifdef __MINGW32__
  75                 strbuf_addch(out, ';');
  76 #else
  77                 strbuf_addch(out, ':');
  78 #endif
  79         }
  80 }
  81
  82 void setup_path(const char *cmd_path)
  83 {
  84         const char *old_path = getenv("PATH");
  85         struct strbuf new_path;
  86
  87         strbuf_init(&new_path, 0);
  88
  89         add_path(&new_path, argv_exec_path);
  90         add_path(&new_path, getenv(EXEC_PATH_ENVIRONMENT));
  91         add_path(&new_path, builtin_exec_path());
  92         add_path(&new_path, cmd_path);
  93
  94         if (old_path)
  95                 strbuf_addstr(&new_path, old_path);
  96         else
  97                 strbuf_addstr(&new_path, "/usr/local/bin:/usr/bin:/bin");
  98
  99         setenv("PATH", new_path.buf, 1);
 100
 101         strbuf_release(&new_path);
 102 }
 103
 104 int execv_git_cmd(const char **argv)
 105 {
 106         struct strbuf cmd;
 107         const char *tmp;
 108
 109         strbuf_init(&cmd, 0);
 110         strbuf_addf(&cmd, "git-%s", argv[0]);
 111
 112         /*
 113          * argv[0] must be the git command, but the argv array
 114          * belongs to the caller, and may be reused in
 115          * subsequent loop iterations. Save argv[0] and
 116          * restore it on error.
 117          */
 118         tmp = argv[0];
 119         argv[0] = cmd.buf;
 120
 121         trace_argv_printf(argv, -1, "trace: exec:");
 122
 123         /* execvp() can only ever return if it fails */
 124         execvp(cmd.buf, (char **)argv);
 125
 126         trace_printf("trace: exec failed: %s\n", strerror(errno));
 127
 128         argv[0] = tmp;
 129
 130         strbuf_release(&cmd);
 131
 132         return -1;
 133 }
 134
 135
 136 int execl_git_cmd(const char *cmd,...)
 137 {
 138         int argc;
 139         const char *argv[MAX_ARGS + 1];
 140         const char *arg;
 141         va_list param;
 142
 143         va_start(param, cmd);
 144         argv[0] = cmd;
 145         argc = 1;
 146         while (argc < MAX_ARGS) {
 147                 arg = argv[argc++] = va_arg(param, char *);
 148                 if (!arg)
 149                         break;
 150         }
 151         va_end(param);
 152         if (MAX_ARGS <= argc)
 153                 return error("too many args to run %s", cmd);
 154
 155         argv[argc] = NULL;
 156         return execv_git_cmd(argv);
 157 }
 158
 159 int spawnv_git_cmd(const char **argv, int pin[2], int pout[2])
 160 {
 161         pid_t pid;
 162         struct strbuf cmd;
 163         const char *tmp;
 164
 165         strbuf_init(&cmd, 0);
 166         strbuf_addf(&cmd, "git-%s", argv[0]);
 167
 168         /* argv[0] must be the git command, but the argv array
 169          * belongs to the caller.  Save argv[0] and
 170          * restore it later.
 171          */
 172
 173         tmp = argv[0];
 174         argv[0] = cmd.buf;
 175
 176         trace_argv_printf(argv, -1, "trace: exec:");
 177
 178         pid = spawnvpe_pipe(cmd.buf, argv, environ,
 179                 pin, pout);
 180
 181         argv[0] = tmp;
 182         return pid;
 183
 184 }