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
  41const char *git_extract_argv0_path(const char *argv0)
  42{
  43        const char *slash;
  44
  45        if (!argv0 || !*argv0)
  46                return NULL;
  47        slash = argv0 + strlen(argv0);
  48
  49        while (argv0 <= slash && !is_dir_sep(*slash))
  50                slash--;
  51
  52        if (slash >= argv0) {
  53                argv0_path = xstrndup(argv0, slash - argv0);
  54                return slash + 1;
  55        }
  56
  57        return argv0;
  58}
  59
  60void git_set_argv_exec_path(const char *exec_path)
  61{
  62        argv_exec_path = exec_path;
  63        /*
  64         * Propagate this setting to external programs.
  65         */
  66        setenv(EXEC_PATH_ENVIRONMENT, exec_path, 1);
  67}
  68
  69
  70/* Returns the highest-priority, location to look for git programs. */
  71const char *git_exec_path(void)
  72{
  73        const char *env;
  74
  75        if (argv_exec_path)
  76                return argv_exec_path;
  77
  78        env = getenv(EXEC_PATH_ENVIRONMENT);
  79        if (env && *env) {
  80                return env;
  81        }
  82
  83        return system_path(GIT_EXEC_PATH);
  84}
  85
  86static void add_path(struct strbuf *out, const char *path)
  87{
  88        if (path && *path) {
  89                strbuf_add_absolute_path(out, path);
  90                strbuf_addch(out, PATH_SEP);
  91        }
  92}
  93
  94void setup_path(void)
  95{
  96        const char *old_path = getenv("PATH");
  97        struct strbuf new_path = STRBUF_INIT;
  98
  99        add_path(&new_path, git_exec_path());
 100
 101        if (old_path)
 102                strbuf_addstr(&new_path, old_path);
 103        else
 104                strbuf_addstr(&new_path, _PATH_DEFPATH);
 105
 106        setenv("PATH", new_path.buf, 1);
 107
 108        strbuf_release(&new_path);
 109}
 110
 111const char **prepare_git_cmd(struct argv_array *out, const char **argv)
 112{
 113        argv_array_push(out, "git");
 114        argv_array_pushv(out, argv);
 115        return out->argv;
 116}
 117
 118int execv_git_cmd(const char **argv) {
 119        struct argv_array nargv = ARGV_ARRAY_INIT;
 120
 121        prepare_git_cmd(&nargv, argv);
 122        trace_argv_printf(nargv.argv, "trace: exec:");
 123
 124        /* execvp() can only ever return if it fails */
 125        sane_execvp("git", (char **)nargv.argv);
 126
 127        trace_printf("trace: exec failed: %s\n", strerror(errno));
 128
 129        argv_array_clear(&nargv);
 130        return -1;
 131}
 132
 133
 134int execl_git_cmd(const char *cmd,...)
 135{
 136        int argc;
 137        const char *argv[MAX_ARGS + 1];
 138        const char *arg;
 139        va_list param;
 140
 141        va_start(param, cmd);
 142        argv[0] = cmd;
 143        argc = 1;
 144        while (argc < MAX_ARGS) {
 145                arg = argv[argc++] = va_arg(param, char *);
 146                if (!arg)
 147                        break;
 148        }
 149        va_end(param);
 150        if (MAX_ARGS <= argc)
 151                return error("too many args to run %s", cmd);
 152
 153        argv[argc] = NULL;
 154        return execv_git_cmd(argv);
 155}