Andrew's git - gitweb.git/blob

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