diff options
Diffstat (limited to 'guts/rename.c')
-rw-r--r-- | guts/rename.c | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/guts/rename.c b/guts/rename.c new file mode 100644 index 0000000..9dd6d99 --- /dev/null +++ b/guts/rename.c @@ -0,0 +1,77 @@ +/* + * static int + * wrap_rename(const char *oldpath, const char *newpath) { + * int rc = -1; + */ + pseudo_msg_t *msg; + struct stat64 oldbuf, newbuf; + int oldrc, newrc; + int save_errno; + + pseudo_debug(1, "rename: %s->%s\n", + oldpath ? oldpath : "<nil>", + newpath ? newpath : "<nil>"); + + if (!oldpath || !newpath) { + errno = EFAULT; + return -1; + } + + save_errno = errno; + + newrc = real___lxstat64(_STAT_VER, newpath, &newbuf); + oldrc = real___lxstat64(_STAT_VER, oldpath, &oldbuf); + + errno = save_errno; + + rc = real_rename(oldpath, newpath); + if (rc == -1) { + /* we failed, and we don't care why */ + return rc; + } + save_errno = errno; + /* nothing to do for a "rename" of a link to itself */ + if (newrc != -1 && oldrc != -1 && + newbuf.st_dev == oldbuf.st_dev && + newbuf.st_ino == oldbuf.st_ino) { + return rc; + } + + /* rename(3) is not mv(1). rename(file, dir) fails; you must provide + * the corrected path yourself. You can rename over a directory only + * if the source is a directory. Symlinks are simply removed. + * + * If we got here, the real rename call succeeded. That means newpath + * has been unlinked and oldpath has been linked to it. + * + * There are a ton of special cases to error check. I don't check + * for any of them, because in every such case, the underlying rename + * failed, and there is nothing to do. + * The only tricky part is that, because we used to ignore symlinks, + * we may have to rename or remove directory trees even though in + * theory rename can never destroy a directory tree. + */ + + /* newpath must be removed. */ + pseudo_client_op(OP_UNLINK, AT_SYMLINK_NOFOLLOW, -1, -1, newpath, &newbuf); + + /* fill in "correct" details from server */ + msg = pseudo_client_op(OP_STAT, AT_SYMLINK_NOFOLLOW, -1, -1, oldpath, &oldbuf); + if (msg && msg->result == RESULT_SUCCEED) { + pseudo_stat_msg(&oldbuf, msg); + pseudo_debug(1, "renaming %s, got old mode of 0%o\n", oldpath, (int) msg->mode); + } else { + /* create an entry under the old name, which will then be + * renamed; this way, children would get renamed too, if there + * were any. + */ + pseudo_debug(1, "renaming new '%s' [%llu]\n", + oldpath, (unsigned long long) oldbuf.st_ino); + pseudo_client_op(OP_LINK, AT_SYMLINK_NOFOLLOW, -1, -1, oldpath, &oldbuf); + } + pseudo_client_op(OP_RENAME, AT_SYMLINK_NOFOLLOW, -1, -1, newpath, &oldbuf, oldpath); + + errno = save_errno; +/* return rc; + * } + */ |