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chdir-notify.c

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#include "git-compat-util.h"

#include "abspath.h"

#include "chdir-notify.h"

#include "list.h"

#include "path.h"

#include "strbuf.h"

#include "trace.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);

}

void chdir_notify_unregister(const char *name, chdir_notify_callback cb,

void *data)

{

struct list_head *pos, *p;

list_for_each_safe(pos, p, &chdir_notify_entries) {

struct chdir_notify_entry *e =

list_entry(pos, struct chdir_notify_entry, list);

if (e->cb != cb || e->data != data || !e->name != !name ||

(e->name && strcmp(e->name, name)))

continue;

list_del(pos);

free(e);

}

}

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;

}