git

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#include "git-compat-util.h"
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#include "abspath.h"
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#include "chdir-notify.h"
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#include "list.h"
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#include "path.h"
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#include "strbuf.h"
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#include "trace.h"
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struct chdir_notify_entry {
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	const char *name;
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	chdir_notify_callback cb;
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	void *data;
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	struct list_head list;
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};
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static LIST_HEAD(chdir_notify_entries);
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void chdir_notify_register(const char *name,
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			   chdir_notify_callback cb,
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			   void *data)
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{
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	struct chdir_notify_entry *e = xmalloc(sizeof(*e));
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	e->name = name;
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	e->cb = cb;
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	e->data = data;
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	list_add_tail(&e->list, &chdir_notify_entries);
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}
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static void reparent_cb(const char *name,
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			const char *old_cwd,
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			const char *new_cwd,
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			void *data)
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{
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	char **path = data;
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	char *tmp = *path;
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	if (!tmp)
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		return;
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	*path = reparent_relative_path(old_cwd, new_cwd, tmp);
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	free(tmp);
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	if (name) {
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		trace_printf_key(&trace_setup_key,
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				 "setup: reparent %s to '%s'",
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				 name, *path);
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	}
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}
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void chdir_notify_reparent(const char *name, char **path)
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{
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	chdir_notify_register(name, reparent_cb, path);
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}
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int chdir_notify(const char *new_cwd)
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{
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	struct strbuf old_cwd = STRBUF_INIT;
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	struct list_head *pos;
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	if (strbuf_getcwd(&old_cwd) < 0)
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		return -1;
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	if (chdir(new_cwd) < 0) {
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		int saved_errno = errno;
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		strbuf_release(&old_cwd);
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		errno = saved_errno;
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		return -1;
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	}
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	trace_printf_key(&trace_setup_key,
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			 "setup: chdir from '%s' to '%s'",
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			 old_cwd.buf, new_cwd);
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	list_for_each(pos, &chdir_notify_entries) {
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		struct chdir_notify_entry *e =
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			list_entry(pos, struct chdir_notify_entry, list);
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		e->cb(e->name, old_cwd.buf, new_cwd, e->data);
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	}
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	strbuf_release(&old_cwd);
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	return 0;
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}
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char *reparent_relative_path(const char *old_cwd,
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			     const char *new_cwd,
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			     const char *path)
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{
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	char *ret, *full;
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	if (is_absolute_path(path))
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		return xstrdup(path);
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	full = xstrfmt("%s/%s", old_cwd, path);
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	ret = xstrdup(remove_leading_path(full, new_cwd));
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	free(full);
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	return ret;
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}
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