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-rw-r--r--chdir-notify.c93
1 files changed, 93 insertions, 0 deletions
diff --git a/chdir-notify.c b/chdir-notify.c
new file mode 100644
index 0000000000..5f7f2c2ac2
--- /dev/null
+++ b/chdir-notify.c
@@ -0,0 +1,93 @@
+#include "cache.h"
+#include "chdir-notify.h"
+#include "list.h"
+#include "strbuf.h"
+
+struct chdir_notify_entry {
+ const char *name;
+ chdir_notify_callback cb;
+ void *data;
+ struct list_head list;
+};
+static LIST_HEAD(chdir_notify_entries);
+
+void chdir_notify_register(const char *name,
+ chdir_notify_callback cb,
+ void *data)
+{
+ struct chdir_notify_entry *e = xmalloc(sizeof(*e));
+ e->name = name;
+ e->cb = cb;
+ e->data = data;
+ list_add_tail(&e->list, &chdir_notify_entries);
+}
+
+static void reparent_cb(const char *name,
+ const char *old_cwd,
+ const char *new_cwd,
+ void *data)
+{
+ char **path = data;
+ char *tmp = *path;
+
+ if (!tmp)
+ return;
+
+ *path = reparent_relative_path(old_cwd, new_cwd, tmp);
+ free(tmp);
+
+ if (name) {
+ trace_printf_key(&trace_setup_key,
+ "setup: reparent %s to '%s'",
+ name, *path);
+ }
+}
+
+void chdir_notify_reparent(const char *name, char **path)
+{
+ chdir_notify_register(name, reparent_cb, path);
+}
+
+int chdir_notify(const char *new_cwd)
+{
+ struct strbuf old_cwd = STRBUF_INIT;
+ struct list_head *pos;
+
+ if (strbuf_getcwd(&old_cwd) < 0)
+ return -1;
+ if (chdir(new_cwd) < 0) {
+ int saved_errno = errno;
+ strbuf_release(&old_cwd);
+ errno = saved_errno;
+ return -1;
+ }
+
+ trace_printf_key(&trace_setup_key,
+ "setup: chdir from '%s' to '%s'",
+ old_cwd.buf, new_cwd);
+
+ list_for_each(pos, &chdir_notify_entries) {
+ struct chdir_notify_entry *e =
+ list_entry(pos, struct chdir_notify_entry, list);
+ e->cb(e->name, old_cwd.buf, new_cwd, e->data);
+ }
+
+ strbuf_release(&old_cwd);
+ return 0;
+}
+
+char *reparent_relative_path(const char *old_cwd,
+ const char *new_cwd,
+ const char *path)
+{
+ char *ret, *full;
+
+ if (is_absolute_path(path))
+ return xstrdup(path);
+
+ full = xstrfmt("%s/%s", old_cwd, path);
+ ret = xstrdup(remove_leading_path(full, new_cwd));
+ free(full);
+
+ return ret;
+}