Andrew's git - gitweb.git/blob

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