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