chdir-notify.c

   1 #include "cache.h"
   2 #include "abspath.h"
   3 #include "chdir-notify.h"
   4 #include "list.h"
   5 #include "strbuf.h"
   6
   7 struct chdir_notify_entry {
   8         const char *name;
   9         chdir_notify_callback cb;
  10         void *data;
  11         struct list_head list;
  12 };
  13 static LIST_HEAD(chdir_notify_entries);
  14
  15 void chdir_notify_register(const char *name,
  16                            chdir_notify_callback cb,
  17                            void *data)
  18 {
  19         struct chdir_notify_entry *e = xmalloc(sizeof(*e));
  20         e->name = name;
  21         e->cb = cb;
  22         e->data = data;
  23         list_add_tail(&e->list, &chdir_notify_entries);
  24 }
  25
  26 static void reparent_cb(const char *name,
  27                         const char *old_cwd,
  28                         const char *new_cwd,
  29                         void *data)
  30 {
  31         char **path = data;
  32         char *tmp = *path;
  33
  34         if (!tmp)
  35                 return;
  36
  37         *path = reparent_relative_path(old_cwd, new_cwd, tmp);
  38         free(tmp);
  39
  40         if (name) {
  41                 trace_printf_key(&trace_setup_key,
  42                                  "setup: reparent %s to '%s'",
  43                                  name, *path);
  44         }
  45 }
  46
  47 void chdir_notify_reparent(const char *name, char **path)
  48 {
  49         chdir_notify_register(name, reparent_cb, path);
  50 }
  51
  52 int chdir_notify(const char *new_cwd)
  53 {
  54         struct strbuf old_cwd = STRBUF_INIT;
  55         struct list_head *pos;
  56
  57         if (strbuf_getcwd(&old_cwd) < 0)
  58                 return -1;
  59         if (chdir(new_cwd) < 0) {
  60                 int saved_errno = errno;
  61                 strbuf_release(&old_cwd);
  62                 errno = saved_errno;
  63                 return -1;
  64         }
  65
  66         trace_printf_key(&trace_setup_key,
  67                          "setup: chdir from '%s' to '%s'",
  68                          old_cwd.buf, new_cwd);
  69
  70         list_for_each(pos, &chdir_notify_entries) {
  71                 struct chdir_notify_entry *e =
  72                         list_entry(pos, struct chdir_notify_entry, list);
  73                 e->cb(e->name, old_cwd.buf, new_cwd, e->data);
  74         }
  75
  76         strbuf_release(&old_cwd);
  77         return 0;
  78 }
  79
  80 char *reparent_relative_path(const char *old_cwd,
  81                              const char *new_cwd,
  82                              const char *path)
  83 {
  84         char *ret, *full;
  85
  86         if (is_absolute_path(path))
  87                 return xstrdup(path);
  88
  89         full = xstrfmt("%s/%s", old_cwd, path);
  90         ret = xstrdup(remove_leading_path(full, new_cwd));
  91         free(full);
  92
  93         return ret;
  94 }