Andrew's git - gitweb.git/blob

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