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
   9 static const char *builtin_exec_path(void)
  10 {
  11         return GIT_EXEC_PATH;
  12 }
  13
  14 void git_set_argv_exec_path(const char *exec_path)
  15 {
  16         argv_exec_path = exec_path;
  17 }
  18
  19
  20 /* Returns the highest-priority, location to look for git programs. */
  21 const char *git_exec_path(void)
  22 {
  23         const char *env;
  24
  25         if (argv_exec_path)
  26                 return argv_exec_path;
  27
  28         env = getenv(EXEC_PATH_ENVIRONMENT);
  29         if (env && *env) {
  30                 return env;
  31         }
  32
  33         return builtin_exec_path();
  34 }
  35
  36 static void add_path(struct strbuf *out, const char *path)
  37 {
  38         if (path && *path) {
  39                 if (is_absolute_path(path))
  40                         strbuf_addstr(out, path);
  41                 else
  42                         strbuf_addstr(out, make_absolute_path(path));
  43
  44                 strbuf_addch(out, PATH_SEP);
  45         }
  46 }
  47
  48 void setup_path(const char *cmd_path)
  49 {
  50         const char *old_path = getenv("PATH");
  51         struct strbuf new_path;
  52
  53         strbuf_init(&new_path, 0);
  54
  55         add_path(&new_path, argv_exec_path);
  56         add_path(&new_path, getenv(EXEC_PATH_ENVIRONMENT));
  57         add_path(&new_path, builtin_exec_path());
  58         add_path(&new_path, cmd_path);
  59
  60         if (old_path)
  61                 strbuf_addstr(&new_path, old_path);
  62         else
  63                 strbuf_addstr(&new_path, "/usr/local/bin:/usr/bin:/bin");
  64
  65         setenv("PATH", new_path.buf, 1);
  66
  67         strbuf_release(&new_path);
  68 }
  69
  70 int execv_git_cmd(const char **argv)
  71 {
  72         struct strbuf cmd;
  73         const char *tmp;
  74
  75         strbuf_init(&cmd, 0);
  76         strbuf_addf(&cmd, "git-%s", argv[0]);
  77
  78         /*
  79          * argv[0] must be the git command, but the argv array
  80          * belongs to the caller, and may be reused in
  81          * subsequent loop iterations. Save argv[0] and
  82          * restore it on error.
  83          */
  84         tmp = argv[0];
  85         argv[0] = cmd.buf;
  86
  87         trace_argv_printf(argv, "trace: exec:");
  88
  89         /* execvp() can only ever return if it fails */
  90         execvp(cmd.buf, (char **)argv);
  91
  92         trace_printf("trace: exec failed: %s\n", strerror(errno));
  93
  94         argv[0] = tmp;
  95
  96         strbuf_release(&cmd);
  97
  98         return -1;
  99 }
 100
 101
 102 int execl_git_cmd(const char *cmd,...)
 103 {
 104         int argc;
 105         const char *argv[MAX_ARGS + 1];
 106         const char *arg;
 107         va_list param;
 108
 109         va_start(param, cmd);
 110         argv[0] = cmd;
 111         argc = 1;
 112         while (argc < MAX_ARGS) {
 113                 arg = argv[argc++] = va_arg(param, char *);
 114                 if (!arg)
 115                         break;
 116         }
 117         va_end(param);
 118         if (MAX_ARGS <= argc)
 119                 return error("too many args to run %s", cmd);
 120
 121         argv[argc] = NULL;
 122         return execv_git_cmd(argv);
 123 }