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;
   8
   9#ifdef RUNTIME_PREFIX
  10static const char *argv0_path;
  11
  12static const char *system_prefix(void)
  13{
  14        static const char *prefix;
  15
  16        assert(argv0_path);
  17        assert(is_absolute_path(argv0_path));
  18
  19        if (!prefix &&
  20            !(prefix = strip_path_suffix(argv0_path, GIT_EXEC_PATH)) &&
  21            !(prefix = strip_path_suffix(argv0_path, BINDIR)) &&
  22            !(prefix = strip_path_suffix(argv0_path, "git"))) {
  23                prefix = PREFIX;
  24                trace_printf("RUNTIME_PREFIX requested, "
  25                                "but prefix computation failed.  "
  26                                "Using static fallback '%s'.\n", prefix);
  27        }
  28        return prefix;
  29}
  30
  31void git_extract_argv0_path(const char *argv0)
  32{
  33        const char *slash;
  34
  35        if (!argv0 || !*argv0)
  36                return;
  37
  38        slash = find_last_dir_sep(argv0);
  39
  40        if (slash)
  41                argv0_path = xstrndup(argv0, slash - argv0);
  42}
  43
  44#else
  45
  46static const char *system_prefix(void)
  47{
  48        return PREFIX;
  49}
  50
  51void git_extract_argv0_path(const char *argv0)
  52{
  53}
  54
  55#endif /* RUNTIME_PREFIX */
  56
  57char *system_path(const char *path)
  58{
  59        struct strbuf d = STRBUF_INIT;
  60
  61        if (is_absolute_path(path))
  62                return xstrdup(path);
  63
  64        strbuf_addf(&d, "%s/%s", system_prefix(), path);
  65        return strbuf_detach(&d, NULL);
  66}
  67
  68void git_set_argv_exec_path(const char *exec_path)
  69{
  70        argv_exec_path = exec_path;
  71        /*
  72         * Propagate this setting to external programs.
  73         */
  74        setenv(EXEC_PATH_ENVIRONMENT, exec_path, 1);
  75}
  76
  77
  78/* Returns the highest-priority, location to look for git programs. */
  79const char *git_exec_path(void)
  80{
  81        static char *cached_exec_path;
  82
  83        if (argv_exec_path)
  84                return argv_exec_path;
  85
  86        if (!cached_exec_path) {
  87                const char *env = getenv(EXEC_PATH_ENVIRONMENT);
  88                if (env && *env)
  89                        cached_exec_path = xstrdup(env);
  90                else
  91                        cached_exec_path = system_path(GIT_EXEC_PATH);
  92        }
  93        return cached_exec_path;
  94}
  95
  96static void add_path(struct strbuf *out, const char *path)
  97{
  98        if (path && *path) {
  99                strbuf_add_absolute_path(out, path);
 100                strbuf_addch(out, PATH_SEP);
 101        }
 102}
 103
 104void setup_path(void)
 105{
 106        const char *old_path = getenv("PATH");
 107        struct strbuf new_path = STRBUF_INIT;
 108
 109        add_path(&new_path, git_exec_path());
 110
 111        if (old_path)
 112                strbuf_addstr(&new_path, old_path);
 113        else
 114                strbuf_addstr(&new_path, _PATH_DEFPATH);
 115
 116        setenv("PATH", new_path.buf, 1);
 117
 118        strbuf_release(&new_path);
 119}
 120
 121const char **prepare_git_cmd(struct argv_array *out, const char **argv)
 122{
 123        argv_array_push(out, "git");
 124        argv_array_pushv(out, argv);
 125        return out->argv;
 126}
 127
 128int execv_git_cmd(const char **argv) {
 129        struct argv_array nargv = ARGV_ARRAY_INIT;
 130
 131        prepare_git_cmd(&nargv, argv);
 132        trace_argv_printf(nargv.argv, "trace: exec:");
 133
 134        /* execvp() can only ever return if it fails */
 135        sane_execvp("git", (char **)nargv.argv);
 136
 137        trace_printf("trace: exec failed: %s\n", strerror(errno));
 138
 139        argv_array_clear(&nargv);
 140        return -1;
 141}
 142
 143
 144int execl_git_cmd(const char *cmd,...)
 145{
 146        int argc;
 147        const char *argv[MAX_ARGS + 1];
 148        const char *arg;
 149        va_list param;
 150
 151        va_start(param, cmd);
 152        argv[0] = cmd;
 153        argc = 1;
 154        while (argc < MAX_ARGS) {
 155                arg = argv[argc++] = va_arg(param, char *);
 156                if (!arg)
 157                        break;
 158        }
 159        va_end(param);
 160        if (MAX_ARGS <= argc)
 161                return error("too many args to run %s", cmd);
 162
 163        argv[argc] = NULL;
 164        return execv_git_cmd(argv);
 165}