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
   6static const char *argv_exec_path;
   7static const char *argv0_path;
   8
   9char *system_path(const char *path)
  10{
  11#ifdef RUNTIME_PREFIX
  12        static const char *prefix;
  13#else
  14        static const char *prefix = PREFIX;
  15#endif
  16        struct strbuf d = STRBUF_INIT;
  17
  18        if (is_absolute_path(path))
  19                return xstrdup(path);
  20
  21#ifdef RUNTIME_PREFIX
  22        assert(argv0_path);
  23        assert(is_absolute_path(argv0_path));
  24
  25        if (!prefix &&
  26            !(prefix = strip_path_suffix(argv0_path, GIT_EXEC_PATH)) &&
  27            !(prefix = strip_path_suffix(argv0_path, BINDIR)) &&
  28            !(prefix = strip_path_suffix(argv0_path, "git"))) {
  29                prefix = PREFIX;
  30                trace_printf("RUNTIME_PREFIX requested, "
  31                                "but prefix computation failed.  "
  32                                "Using static fallback '%s'.\n", prefix);
  33        }
  34#endif
  35
  36        strbuf_addf(&d, "%s/%s", prefix, path);
  37        return strbuf_detach(&d, NULL);
  38}
  39
  40const char *git_extract_argv0_path(const char *argv0)
  41{
  42        const char *slash;
  43
  44        if (!argv0 || !*argv0)
  45                return NULL;
  46
  47        slash = find_last_dir_sep(argv0);
  48
  49        if (slash) {
  50                argv0_path = xstrndup(argv0, slash - argv0);
  51                return slash + 1;
  52        }
  53
  54        return argv0;
  55}
  56
  57void git_set_argv_exec_path(const char *exec_path)
  58{
  59        argv_exec_path = exec_path;
  60        /*
  61         * Propagate this setting to external programs.
  62         */
  63        setenv(EXEC_PATH_ENVIRONMENT, exec_path, 1);
  64}
  65
  66
  67/* Returns the highest-priority, location to look for git programs. */
  68const char *git_exec_path(void)
  69{
  70        const char *env;
  71
  72        if (argv_exec_path)
  73                return argv_exec_path;
  74
  75        env = getenv(EXEC_PATH_ENVIRONMENT);
  76        if (env && *env) {
  77                return env;
  78        }
  79
  80        return system_path(GIT_EXEC_PATH);
  81}
  82
  83static void add_path(struct strbuf *out, const char *path)
  84{
  85        if (path && *path) {
  86                strbuf_add_absolute_path(out, path);
  87                strbuf_addch(out, PATH_SEP);
  88        }
  89}
  90
  91void setup_path(void)
  92{
  93        const char *old_path = getenv("PATH");
  94        struct strbuf new_path = STRBUF_INIT;
  95
  96        add_path(&new_path, git_exec_path());
  97
  98        if (old_path)
  99                strbuf_addstr(&new_path, old_path);
 100        else
 101                strbuf_addstr(&new_path, _PATH_DEFPATH);
 102
 103        setenv("PATH", new_path.buf, 1);
 104
 105        strbuf_release(&new_path);
 106}
 107
 108const char **prepare_git_cmd(const char **argv)
 109{
 110        int argc;
 111        const char **nargv;
 112
 113        for (argc = 0; argv[argc]; argc++)
 114                ; /* just counting */
 115        nargv = xmalloc(sizeof(*nargv) * (argc + 2));
 116
 117        nargv[0] = "git";
 118        for (argc = 0; argv[argc]; argc++)
 119                nargv[argc + 1] = argv[argc];
 120        nargv[argc + 1] = NULL;
 121        return nargv;
 122}
 123
 124int execv_git_cmd(const char **argv) {
 125        const char **nargv = prepare_git_cmd(argv);
 126        trace_argv_printf(nargv, "trace: exec:");
 127
 128        /* execvp() can only ever return if it fails */
 129        sane_execvp("git", (char **)nargv);
 130
 131        trace_printf("trace: exec failed: %s\n", strerror(errno));
 132
 133        free(nargv);
 134        return -1;
 135}
 136
 137
 138int execl_git_cmd(const char *cmd,...)
 139{
 140        int argc;
 141        const char *argv[MAX_ARGS + 1];
 142        const char *arg;
 143        va_list param;
 144
 145        va_start(param, cmd);
 146        argv[0] = cmd;
 147        argc = 1;
 148        while (argc < MAX_ARGS) {
 149                arg = argv[argc++] = va_arg(param, char *);
 150                if (!arg)
 151                        break;
 152        }
 153        va_end(param);
 154        if (MAX_ARGS <= argc)
 155                return error("too many args to run %s", cmd);
 156
 157        argv[argc] = NULL;
 158        return execv_git_cmd(argv);
 159}