Andrew's git - gitweb.git/blob

eae56fefba9953b9b589a2b17a7a282d7120754c
   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        static char *system_exec_path;
  73
  74        if (argv_exec_path)
  75                return argv_exec_path;
  76
  77        env = getenv(EXEC_PATH_ENVIRONMENT);
  78        if (env && *env) {
  79                return env;
  80        }
  81
  82        if (!system_exec_path)
  83                system_exec_path = system_path(GIT_EXEC_PATH);
  84        return system_exec_path;
  85}
  86
  87static void add_path(struct strbuf *out, const char *path)
  88{
  89        if (path && *path) {
  90                strbuf_add_absolute_path(out, path);
  91                strbuf_addch(out, PATH_SEP);
  92        }
  93}
  94
  95void setup_path(void)
  96{
  97        const char *old_path = getenv("PATH");
  98        struct strbuf new_path = STRBUF_INIT;
  99
 100        add_path(&new_path, git_exec_path());
 101
 102        if (old_path)
 103                strbuf_addstr(&new_path, old_path);
 104        else
 105                strbuf_addstr(&new_path, _PATH_DEFPATH);
 106
 107        setenv("PATH", new_path.buf, 1);
 108
 109        strbuf_release(&new_path);
 110}
 111
 112const char **prepare_git_cmd(struct argv_array *out, const char **argv)
 113{
 114        argv_array_push(out, "git");
 115        argv_array_pushv(out, argv);
 116        return out->argv;
 117}
 118
 119int execv_git_cmd(const char **argv) {
 120        struct argv_array nargv = ARGV_ARRAY_INIT;
 121
 122        prepare_git_cmd(&nargv, argv);
 123        trace_argv_printf(nargv.argv, "trace: exec:");
 124
 125        /* execvp() can only ever return if it fails */
 126        sane_execvp("git", (char **)nargv.argv);
 127
 128        trace_printf("trace: exec failed: %s\n", strerror(errno));
 129
 130        argv_array_clear(&nargv);
 131        return -1;
 132}
 133
 134
 135int execl_git_cmd(const char *cmd,...)
 136{
 137        int argc;
 138        const char *argv[MAX_ARGS + 1];
 139        const char *arg;
 140        va_list param;
 141
 142        va_start(param, cmd);
 143        argv[0] = cmd;
 144        argc = 1;
 145        while (argc < MAX_ARGS) {
 146                arg = argv[argc++] = va_arg(param, char *);
 147                if (!arg)
 148                        break;
 149        }
 150        va_end(param);
 151        if (MAX_ARGS <= argc)
 152                return error("too many args to run %s", cmd);
 153
 154        argv[argc] = NULL;
 155        return execv_git_cmd(argv);
 156}