Merge branch 'jc/fix-2.45.1-and-friends-for-2.39' into maint-2.39

[git/debian.git] / chdir-notify.c

#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;
}