chdir-notify.c

   1 #include "cache.h"
   2 #include "chdir-notify.h"
   3 #include "list.h"
   4 #include "strbuf.h"
   5
   6 struct chdir_notify_entry {
   7         const char *name;
   8         chdir_notify_callback cb;
   9         void *data;
  10         struct list_head list;
  11 };
  12 static LIST_HEAD(chdir_notify_entries);
  13
  14 void chdir_notify_register(const char *name,
  15                            chdir_notify_callback cb,
  16                            void *data)
  17 {
  18         struct chdir_notify_entry *e = xmalloc(sizeof(*e));
  19         e->name = name;
  20         e->cb = cb;
  21         e->data = data;
  22         list_add_tail(&e->list, &chdir_notify_entries);
  23 }
  24
  25 static void reparent_cb(const char *name,
  26                         const char *old_cwd,
  27                         const char *new_cwd,
  28                         void *data)
  29 {
  30         char **path = data;
  31         char *tmp = *path;
  32
  33         if (!tmp)
  34                 return;
  35
  36         *path = reparent_relative_path(old_cwd, new_cwd, tmp);
  37         free(tmp);
  38
  39         if (name) {
  40                 trace_printf_key(&trace_setup_key,
  41                                  "setup: reparent %s to '%s'",
  42                                  name, *path);
  43         }
  44 }
  45
  46 void chdir_notify_reparent(const char *name, char **path)
  47 {
  48         chdir_notify_register(name, reparent_cb, path);
  49 }
  50
  51 int chdir_notify(const char *new_cwd)
  52 {
  53         struct strbuf old_cwd = STRBUF_INIT;
  54         struct list_head *pos;
  55
  56         if (strbuf_getcwd(&old_cwd) < 0)
  57                 return -1;
  58         if (chdir(new_cwd) < 0) {
  59                 int saved_errno = errno;
  60                 strbuf_release(&old_cwd);
  61                 errno = saved_errno;
  62                 return -1;
  63         }
  64
  65         trace_printf_key(&trace_setup_key,
  66                          "setup: chdir from '%s' to '%s'",
  67                          old_cwd.buf, new_cwd);
  68
  69         list_for_each(pos, &chdir_notify_entries) {
  70                 struct chdir_notify_entry *e =
  71                         list_entry(pos, struct chdir_notify_entry, list);
  72                 e->cb(e->name, old_cwd.buf, new_cwd, e->data);
  73         }
  74
  75         strbuf_release(&old_cwd);
  76         return 0;
  77 }
  78
  79 char *reparent_relative_path(const char *old_cwd,
  80                              const char *new_cwd,
  81                              const char *path)
  82 {
  83         char *ret, *full;
  84
  85         if (is_absolute_path(path))
  86                 return xstrdup(path);
  87
  88         full = xstrfmt("%s/%s", old_cwd, path);
  89         ret = xstrdup(remove_leading_path(full, new_cwd));
  90         free(full);
  91
  92         return ret;
  93 }