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        static char *cached_exec_path;
  68
  69        if (argv_exec_path)
  70                return argv_exec_path;
  71
  72        if (!cached_exec_path) {
  73                const char *env = getenv(EXEC_PATH_ENVIRONMENT);
  74                if (env && *env)
  75                        cached_exec_path = xstrdup(env);
  76                else
  77                        cached_exec_path = system_path(GIT_EXEC_PATH);
  78        }
  79        return cached_exec_path;
  80}
  81
  82static void add_path(struct strbuf *out, const char *path)
  83{
  84        if (path && *path) {
  85                strbuf_add_absolute_path(out, path);
  86                strbuf_addch(out, PATH_SEP);
  87        }
  88}
  89
  90void setup_path(void)
  91{
  92        const char *old_path = getenv("PATH");
  93        struct strbuf new_path = STRBUF_INIT;
  94
  95        add_path(&new_path, git_exec_path());
  96
  97        if (old_path)
  98                strbuf_addstr(&new_path, old_path);
  99        else
 100                strbuf_addstr(&new_path, _PATH_DEFPATH);
 101
 102        setenv("PATH", new_path.buf, 1);
 103
 104        strbuf_release(&new_path);
 105}
 106
 107const char **prepare_git_cmd(struct argv_array *out, const char **argv)
 108{
 109        argv_array_push(out, "git");
 110        argv_array_pushv(out, argv);
 111        return out->argv;
 112}
 113
 114int execv_git_cmd(const char **argv) {
 115        struct argv_array nargv = ARGV_ARRAY_INIT;
 116
 117        prepare_git_cmd(&nargv, argv);
 118        trace_argv_printf(nargv.argv, "trace: exec:");
 119
 120        /* execvp() can only ever return if it fails */
 121        sane_execvp("git", (char **)nargv.argv);
 122
 123        trace_printf("trace: exec failed: %s\n", strerror(errno));
 124
 125        argv_array_clear(&nargv);
 126        return -1;
 127}
 128
 129
 130int execl_git_cmd(const char *cmd,...)
 131{
 132        int argc;
 133        const char *argv[MAX_ARGS + 1];
 134        const char *arg;
 135        va_list param;
 136
 137        va_start(param, cmd);
 138        argv[0] = cmd;
 139        argc = 1;
 140        while (argc < MAX_ARGS) {
 141                arg = argv[argc++] = va_arg(param, char *);
 142                if (!arg)
 143                        break;
 144        }
 145        va_end(param);
 146        if (MAX_ARGS <= argc)
 147                return error("too many args to run %s", cmd);
 148
 149        argv[argc] = NULL;
 150        return execv_git_cmd(argv);
 151}