/**
* Definition for a binary tree node.
* struct TreeNode {
* int val;
* struct TreeNode *left;
* struct TreeNode *right;
* };
*/
int is_ancestor(struct TreeNode *root, struct TreeNode *child)
{
if(root == NULL)
return 0;
if(root == child)
return 1;
return is_ancestor(root->left,child) || is_ancestor(root->right,child);
}
struct TreeNode* lowestCommonAncestor(struct TreeNode* root, struct TreeNode* p, struct TreeNode* q) {
if(is_ancestor(root->left,p) && is_ancestor(root->left,q))
return lowestCommonAncestor(root->left,p,q);
if(is_ancestor(root->right,p) && is_ancestor(root->right,q))
return lowestCommonAncestor(root->right,p,q);
return root;
}
/**
* \brief Mark capabilities for a revoke operation.
* \param base The data for the capability being revoked
* \param revoked The revoke target if it is on this core. This specific
* capability copy will not be marked. If supplied, is_copy(base,
* &revoked->cap) must hold.
* \returns
* - CAP_NOT_FOUND if no copies or desendants are present on this core.
* - SYS_ERR_OK otherwise.
*/
errval_t caps_mark_revoke(struct capability *base, struct cte *revoked)
{
assert(base);
assert(!revoked || revoked->mdbnode.owner == my_core_id);
// to avoid multiple mdb_find_greater, we store the predecessor of the
// current position
struct cte *prev = mdb_find_greater(base, true), *next = NULL;
if (!prev || !(is_copy(base, &prev->cap)
|| is_ancestor(&prev->cap, base)))
{
return SYS_ERR_CAP_NOT_FOUND;
}
for (next = mdb_successor(prev);
next && is_copy(base, &next->cap);
next = mdb_successor(prev))
{
// note: if next is a copy of base, prev will also be a copy
if (next == revoked) {
// do not delete the revoked capability, use it as the new prev
// instead, and delete the old prev.
next = prev;
prev = revoked;
}
assert(revoked || next->mdbnode.owner != my_core_id);
caps_mark_revoke_copy(next);
}
for (next = mdb_successor(prev);
next && is_ancestor(&next->cap, base);
next = mdb_successor(prev))
{
caps_mark_revoke_generic(next);
if (next->cap.type) {
// the cap has not been deleted, so we must use it as the new prev
prev = next;
}
}
if (prev != revoked && !prev->mdbnode.in_delete) {
if (is_copy(base, &prev->cap)) {
caps_mark_revoke_copy(prev);
}
else {
// due to early termination the condition, prev must be a
// descendant
assert(is_ancestor(&prev->cap, base));
caps_mark_revoke_generic(prev);
}
}
return SYS_ERR_OK;
}
static url
expand (url u1, url u2) {
if (is_or (u1)) return expand (u1[1], u2) | expand (u1[2], u2);
if (is_or (u2)) return expand (u1, u2[1]) | expand (u1, u2[2]);
if (is_ancestor (u2)) {
if (is_concat (u1)) return u1 | expand (u1[1], u2);
if (is_special_root (u1)) return u2;
return u1 | u2;
}
if (is_concat (u2) && is_ancestor (u2[1]))
return expand (expand (u1, u2[1]), u2[2]);
return u1 * u2;
}
/**
* seccomp_can_sync_threads: checks if all threads can be synchronized
*
* Expects sighand and cred_guard_mutex locks to be held.
*
* Returns 0 on success, -ve on error, or the pid of a thread which was
* either not in the correct seccomp mode or it did not have an ancestral
* seccomp filter.
*/
static inline pid_t seccomp_can_sync_threads(void)
{
struct task_struct *thread, *caller;
BUG_ON(!mutex_is_locked(¤t->signal->cred_guard_mutex));
assert_spin_locked(¤t->sighand->siglock);
/* Validate all threads being eligible for synchronization. */
caller = current;
for_each_thread(caller, thread) {
pid_t failed;
/* Skip current, since it is initiating the sync. */
if (thread == caller)
continue;
if (thread->seccomp.mode == SECCOMP_MODE_DISABLED ||
(thread->seccomp.mode == SECCOMP_MODE_FILTER &&
is_ancestor(thread->seccomp.filter,
caller->seccomp.filter)))
continue;
/* Return the first thread that cannot be synchronized. */
failed = task_pid_vnr(thread);
/* If the pid cannot be resolved, then return -ESRCH */
if (unlikely(WARN_ON(failed == 0)))
failed = -ESRCH;
return failed;
}
// Adds 'parent' as a sire or dam of 'child'
// after checking for re-parentage and cycles.
void add_parent(CatID child, CatID parent) {
// Update Child Pointers
int childPointer = getCat(child);
if (childPointer == NIL) {
childPointer = nextFreeCat();
cats[childPointer].tableEntry = child;
// EDIT ME
symTable[child] = childPointer;
}
// check for re-parentage
if (is_male(parent) ? cats[childPointer].sire != NIL : cats[childPointer].dam != NIL) {
printf("Input ignored: %d already has a %s.\n",
child, is_male(parent) ? "sire" : "dam");
return;
}
// Update Parent Pointers
int parentPointer = getCat(parent);
// printf("%d\n", parentPointer);
if (parentPointer == NIL) {
parentPointer = nextFreeCat();
cats[parentPointer].tableEntry = parent;
// EDIT ME
symTable[parent] = parentPointer;
}
// check for cycles
if (is_ancestor(parent, child)) {
printf("Input ignored: it would cause cycle\n");
return;
}
// set parent pointer
if (is_male(parent)) cats[childPointer].sire = parentPointer;
else cats[childPointer].dam = parentPointer;
// set child pointer
if (cats[parentPointer].eldest_child == NIL) {
// this is first child to be added
assert(cats[parentPointer].youngest_child == NIL);
cats[parentPointer].eldest_child = childPointer;
cats[parentPointer].youngest_child = childPointer;
} else {
// this is not the first child to be added
CatID youngest_child = cats[parentPointer].youngest_child;
assert(youngest_child != NIL);
if (is_male(parent)) {
assert(cats[youngest_child].next_younger_by_sire == NIL);
cats[youngest_child].next_younger_by_sire = childPointer;
} else {
assert(cats[youngest_child].next_younger_by_dam == NIL);
cats[youngest_child].next_younger_by_dam = childPointer;
}
cats[parentPointer].youngest_child = childPointer;
}
}
int pathSum(int*nums, int numsSz){
int cnt [32]={};
int non_leaf[32]={};
int n = numsSz;
for(int i=0;i<n;i++) {
for(int j=0;j<n;j++) {
if(i!=j && is_ancestor(nums[i], nums[j]))
non_leaf[i]=1;
}
}
for(int i=0;i<n;i++) {
for(int j=0;j<n;j++) {
if(!non_leaf[j] && is_ancestor(nums[i], nums[j]))
cnt[i]++;
}
}
int ret=0;
for(int i=0;i<n;i++)
ret += cnt[i] * (nums[i]%10);
return ret;
}
int SemanticDictionary::FindLowestCommonAncestor(const vector<int>& heads,
int p, int a) const {
vector<bool> is_ancestor(heads.size(), false);
int h = p;
// 0 is the root and is a common ancestor.
while (h != 0) {
is_ancestor[h] = true;
h = heads[h];
}
h = a;
while (h != 0) {
if (is_ancestor[h]) return h;
h = heads[h];
}
return 0;
}
TreeNode* find(TreeNode* root, TreeNode* a, TreeNode* b) {
while (true) {
assert(root != nullptr and a != nullptr and b != nullptr);
assert(is_ancestor(root, a));
assert(is_ancestor(root, b));
if (root->left != nullptr and is_ancestor(root->left, a) and is_ancestor(root->left, b)) {
root = root->left;
} else if (root->right != nullptr and is_ancestor(root->right, a) and is_ancestor(root->right, b)) {
root = root->right;
} else {
return root;
}
}
return root;
}
/* Rename a file or directory in the WIM.
*
* This returns a -errno value.
*
* The journal @j is optional.
*/
int
rename_wim_path(WIMStruct *wim, const tchar *from, const tchar *to,
CASE_SENSITIVITY_TYPE case_type,
struct update_command_journal *j)
{
struct wim_dentry *src;
struct wim_dentry *dst;
struct wim_dentry *parent_of_dst;
int ret;
/* This rename() implementation currently only supports actual files
* (not alternate data streams) */
src = get_dentry(wim, from, case_type);
if (!src)
return -errno;
dst = get_dentry(wim, to, case_type);
if (dst) {
/* Destination file exists */
if (src == dst) /* Same file */
return 0;
if (!dentry_is_directory(src)) {
/* Cannot rename non-directory to directory. */
if (dentry_is_directory(dst))
return -EISDIR;
} else {
/* Cannot rename directory to a non-directory or a non-empty
* directory */
if (!dentry_is_directory(dst))
return -ENOTDIR;
if (dentry_has_children(dst))
return -ENOTEMPTY;
}
parent_of_dst = dst->d_parent;
} else {
/* Destination does not exist */
parent_of_dst = get_parent_dentry(wim, to, case_type);
if (!parent_of_dst)
return -errno;
if (!dentry_is_directory(parent_of_dst))
return -ENOTDIR;
}
/* @src can't be an ancestor of @dst. Otherwise we're unlinking @src
* from the tree and creating a loop... */
if (is_ancestor(src, parent_of_dst))
return -EBUSY;
if (j) {
if (dst)
if (journaled_unlink(j, dst))
return -ENOMEM;
if (journaled_unlink(j, src))
return -ENOMEM;
if (journaled_change_name(j, src, path_basename(to)))
return -ENOMEM;
if (journaled_link(j, src, parent_of_dst))
return -ENOMEM;
} else {
ret = dentry_set_name(src, path_basename(to));
if (ret)
return -ENOMEM;
if (dst) {
unlink_dentry(dst);
free_dentry_tree(dst, wim->lookup_table);
}
unlink_dentry(src);
dentry_add_child(parent_of_dst, src);
}
if (src->_full_path)
for_dentry_in_tree(src, free_dentry_full_path, NULL);
return 0;
}
/* AutoBool means:
AF_TRUE: redefine
AF_FALSE: dispatch
AF_DEPENDS: depends
*/
static int compare_usages (usaged *u1, recID rd, usaged *u2, recID rb, Token deps[])
{
int i, nd = 0, j;
if (!u1) return AF_FALSE;
for (i = 0; u1 [i].status != USE_END; i++)
switch (u1 [i].status) {
case USE_LTDEF:
case USE_TCONST:
if (u1 [i].u.t != u2 [i].u.t) return AF_TRUE;
ncase USE_TYPEID:
if (u1 [i].u.T != u2 [i].u.T) return AF_TRUE;
ncase USE_FCALL:
if (u1 [i].u.t == u2 [i].u.t) continue;
switch (is_another_autof (u1 [i].u.t)) {
case AF_TRUE: return AF_TRUE;
case AF_FALSE: continue;
default: for (j = 0; j < nd; j++)
if (deps [j] == u1 [i].u.t)
break;
if (j == nd)
deps [nd++] = u1 [i].u.t;
}
ncase USE_VVAR:
if (intcmp (u1 [i].u.s, u2 [i].u.s))
return AF_TRUE;
ncase USE_MEMB: {
Token p1 [64], p2 [64], *p;
lookup_variable_member (rd, u1[i].u.t, p1, true, 0);
lookup_variable_member (rb, u1[i].u.t, p2 + 2, true, 0);
p2 [1] = is_ancestor (rd, rb, &p, true) == 2 ? POINTSAT : '.';
p2 [0] = p [0];
if (intcmp (p1, p2))
return AF_TRUE;
}
ncase USE_UPCAST:
/* if different, will catch fcalls */
if (u1 [i].u.r != u2 [i].u.r)
continue;
{
Token *p1, p2 [64], *p;
is_ancestor (rd, u1 [i].u.r, &p1, true);
if (rb != u1 [i].u.r) {
is_ancestor (rb, u1 [i].u.r, &p, true);
intcpy (p2 + 2, p);
p2 [1] = is_ancestor (rd, rb, &p, true) == 2 ? POINTSAT : '.';
p2 [0] = p [0];
if (p2 [2] == -1) p2 [1] = -1;
if (p [0] == -1) intcpy (p2, p2 + 2);
} else {
is_ancestor (rd, rb, &p, true);
intcpy (p2, p);
}
if (intcmp (p1, p2))
return AF_TRUE;
}
}
deps [nd] = -1;
return nd ? AF_DEPENDS : AF_FALSE;
}
// Returns true iff 'ancestor' is an ancestor of 'cat'
bool is_ancestor(CatID cat, CatID ancestor) {
if (cat == NIL) return false;
else if (cat == ancestor) return true;
else return is_ancestor(cats[cat].sire, ancestor) ||
is_ancestor(cats[cat].dam, ancestor);
}
static int gfs2_show_options(struct seq_file *s, struct vfsmount *mnt)
{
struct gfs2_sbd *sdp = mnt->mnt_sb->s_fs_info;
struct gfs2_args *args = &sdp->sd_args;
if (is_ancestor(mnt->mnt_root, sdp->sd_master_dir))
seq_printf(s, ",meta");
if (args->ar_lockproto[0])
seq_printf(s, ",lockproto=%s", args->ar_lockproto);
if (args->ar_locktable[0])
seq_printf(s, ",locktable=%s", args->ar_locktable);
if (args->ar_hostdata[0])
seq_printf(s, ",hostdata=%s", args->ar_hostdata);
if (args->ar_spectator)
seq_printf(s, ",spectator");
if (args->ar_ignore_local_fs)
seq_printf(s, ",ignore_local_fs");
if (args->ar_localflocks)
seq_printf(s, ",localflocks");
if (args->ar_localcaching)
seq_printf(s, ",localcaching");
if (args->ar_debug)
seq_printf(s, ",debug");
if (args->ar_upgrade)
seq_printf(s, ",upgrade");
if (args->ar_num_glockd != GFS2_GLOCKD_DEFAULT)
seq_printf(s, ",num_glockd=%u", args->ar_num_glockd);
if (args->ar_posix_acl)
seq_printf(s, ",acl");
if (args->ar_quota != GFS2_QUOTA_DEFAULT) {
char *state;
switch (args->ar_quota) {
case GFS2_QUOTA_OFF:
state = "off";
break;
case GFS2_QUOTA_ACCOUNT:
state = "account";
break;
case GFS2_QUOTA_ON:
state = "on";
break;
default:
state = "unknown";
break;
}
seq_printf(s, ",quota=%s", state);
}
if (args->ar_suiddir)
seq_printf(s, ",suiddir");
if (args->ar_data != GFS2_DATA_DEFAULT) {
char *state;
switch (args->ar_data) {
case GFS2_DATA_WRITEBACK:
state = "writeback";
break;
case GFS2_DATA_ORDERED:
state = "ordered";
break;
default:
state = "unknown";
break;
}
seq_printf(s, ",data=%s", state);
}
return 0;
}
static int
copy_internal (const char *src_path, const char *dst_path,
int new_dst,
dev_t device,
struct dir_list *ancestors,
const struct cp_options *x,
int command_line_arg,
int *copy_into_self,
int *rename_succeeded)
{
struct stat src_sb;
struct stat dst_sb;
mode_t src_mode;
mode_t src_type;
char *earlier_file = NULL;
char *dst_backup = NULL;
int backup_succeeded = 0;
int delayed_fail;
int copied_as_regular = 0;
int ran_chown = 0;
int preserve_metadata;
if (x->move_mode && rename_succeeded)
*rename_succeeded = 0;
*copy_into_self = 0;
if ((*(x->xstat)) (src_path, &src_sb))
{
error (0, errno, _("cannot stat %s"), quote (src_path));
return 1;
}
src_type = src_sb.st_mode;
src_mode = src_sb.st_mode;
if (S_ISDIR (src_type) && !x->recursive)
{
error (0, 0, _("omitting directory %s"), quote (src_path));
return 1;
}
/* Detect the case in which the same source file appears more than
once on the command line and no backup option has been selected.
If so, simply warn and don't copy it the second time.
This check is enabled only if x->src_info is non-NULL. */
if (command_line_arg)
{
if ( ! S_ISDIR (src_sb.st_mode)
&& x->backup_type == none
&& seen_file (x->src_info, src_path, &src_sb))
{
error (0, 0, _("warning: source file %s specified more than once"),
quote (src_path));
return 0;
}
record_file (x->src_info, src_path, &src_sb);
}
if (!new_dst)
{
if ((*(x->xstat)) (dst_path, &dst_sb))
{
if (errno != ENOENT)
{
error (0, errno, _("cannot stat %s"), quote (dst_path));
return 1;
}
else
{
new_dst = 1;
}
}
else
{
int return_now;
int ok = same_file_ok (src_path, &src_sb, dst_path, &dst_sb,
x, &return_now);
if (return_now)
return 0;
if (! ok)
{
error (0, 0, _("%s and %s are the same file"),
quote_n (0, src_path), quote_n (1, dst_path));
return 1;
}
if (!S_ISDIR (dst_sb.st_mode))
{
if (S_ISDIR (src_type))
{
error (0, 0,
_("cannot overwrite non-directory %s with directory %s"),
quote_n (0, dst_path), quote_n (1, src_path));
return 1;
}
/* Don't let the user destroy their data, even if they try hard:
This mv command must fail (likewise for cp):
rm -rf a b c; mkdir a b c; touch a/f b/f; mv a/f b/f c
Otherwise, the contents of b/f would be lost.
In the case of `cp', b/f would be lost if the user simulated
a move using cp and rm.
Note that it works fine if you use --backup=numbered. */
if (command_line_arg
&& x->backup_type != numbered
&& seen_file (x->dest_info, dst_path, &dst_sb))
{
error (0, 0,
_("will not overwrite just-created %s with %s"),
quote_n (0, dst_path), quote_n (1, src_path));
return 1;
}
}
if (!S_ISDIR (src_type))
{
if (S_ISDIR (dst_sb.st_mode))
{
error (0, 0,
_("cannot overwrite directory %s with non-directory"),
quote (dst_path));
return 1;
}
if (x->update && MTIME_CMP (src_sb, dst_sb) <= 0)
{
/* We're using --update and the source file is older
than the destination file, so there is no need to
copy or move. */
/* Pretend the rename succeeded, so the caller (mv)
doesn't end up removing the source file. */
if (rename_succeeded)
*rename_succeeded = 1;
return 0;
}
}
/* When there is an existing destination file, we may end up
returning early, and hence not copying/moving the file.
This may be due to an interactive `negative' reply to the
prompt about the existing file. It may also be due to the
use of the --reply=no option. */
if (!S_ISDIR (src_type))
{
/* cp and mv treat -i and -f differently. */
if (x->move_mode)
{
if ((x->interactive == I_ALWAYS_NO
&& UNWRITABLE (dst_path, dst_sb.st_mode))
|| ((x->interactive == I_ASK_USER
|| (x->interactive == I_UNSPECIFIED
&& x->stdin_tty
&& UNWRITABLE (dst_path, dst_sb.st_mode)))
&& (overwrite_prompt (dst_path, &dst_sb), 1)
&& ! yesno ()))
{
/* Pretend the rename succeeded, so the caller (mv)
doesn't end up removing the source file. */
if (rename_succeeded)
*rename_succeeded = 1;
return 0;
}
}
else
{
if (x->interactive == I_ALWAYS_NO
|| (x->interactive == I_ASK_USER
&& (overwrite_prompt (dst_path, &dst_sb), 1)
&& ! yesno ()))
{
return 0;
}
}
}
if (x->move_mode)
{
/* In move_mode, DEST may not be an existing directory. */
if (S_ISDIR (dst_sb.st_mode))
{
error (0, 0, _("cannot overwrite directory %s"),
quote (dst_path));
return 1;
}
/* Don't allow user to move a directory onto a non-directory. */
if (S_ISDIR (src_sb.st_mode) && !S_ISDIR (dst_sb.st_mode))
{
error (0, 0,
_("cannot move directory onto non-directory: %s -> %s"),
quote_n (0, src_path), quote_n (0, dst_path));
return 1;
}
}
if (x->backup_type != none && !S_ISDIR (dst_sb.st_mode))
{
char *tmp_backup = find_backup_file_name (dst_path,
x->backup_type);
if (tmp_backup == NULL)
xalloc_die ();
/* Detect (and fail) when creating the backup file would
destroy the source file. Before, running the commands
cd /tmp; rm -f a a~; : > a; echo A > a~; cp --b=simple a~ a
would leave two zero-length files: a and a~. */
/* FIXME: but simply change e.g., the final a~ to `./a~'
and the source will still be destroyed. */
if (STREQ (tmp_backup, src_path))
{
const char *fmt;
fmt = (x->move_mode
? _("backing up %s would destroy source; %s not moved")
: _("backing up %s would destroy source; %s not copied"));
error (0, 0, fmt,
quote_n (0, dst_path),
quote_n (1, src_path));
free (tmp_backup);
return 1;
}
dst_backup = (char *) alloca (strlen (tmp_backup) + 1);
strcpy (dst_backup, tmp_backup);
free (tmp_backup);
if (rename (dst_path, dst_backup))
{
if (errno != ENOENT)
{
error (0, errno, _("cannot backup %s"), quote (dst_path));
return 1;
}
else
{
dst_backup = NULL;
}
}
else
{
backup_succeeded = 1;
}
new_dst = 1;
}
else if (! S_ISDIR (dst_sb.st_mode)
&& (x->unlink_dest_before_opening
|| (x->xstat == lstat
&& ! S_ISREG (src_sb.st_mode))))
{
if (unlink (dst_path) && errno != ENOENT)
{
error (0, errno, _("cannot remove %s"), quote (dst_path));
return 1;
}
new_dst = 1;
}
}
}
/* If the source is a directory, we don't always create the destination
directory. So --verbose should not announce anything until we're
sure we'll create a directory. */
if (x->verbose && !S_ISDIR (src_type))
{
printf ("%s -> %s", quote_n (0, src_path), quote_n (1, dst_path));
if (backup_succeeded)
printf (_(" (backup: %s)"), quote (dst_backup));
putchar ('\n');
}
/* Associate the destination path with the source device and inode
so that if we encounter a matching dev/ino pair in the source tree
we can arrange to create a hard link between the corresponding names
in the destination tree.
Sometimes, when preserving links, we have to record dev/ino even
though st_nlink == 1:
- when using -H and processing a command line argument;
that command line argument could be a symlink pointing to another
command line argument. With `cp -H --preserve=link', we hard-link
those two destination files.
- likewise for -L except that it applies to all files, not just
command line arguments.
Also record directory dev/ino when using --recursive. We'll use that
info to detect this problem: cp -R dir dir. FIXME-maybe: ideally,
directory info would be recorded in a separate hash table, since
such entries are useful only while a single command line hierarchy
is being copied -- so that separate table could be cleared between
command line args. Using the same hash table to preserve hard
links means that it may not be cleared. */
if ((x->preserve_links
&& (1 < src_sb.st_nlink
|| (command_line_arg
&& x->dereference == DEREF_COMMAND_LINE_ARGUMENTS)
|| x->dereference == DEREF_ALWAYS))
|| (x->recursive && S_ISDIR (src_type)))
{
earlier_file = remember_copied (dst_path, src_sb.st_ino, src_sb.st_dev);
}
/* Did we copy this inode somewhere else (in this command line argument)
and therefore this is a second hard link to the inode? */
if (earlier_file)
{
/* Avoid damaging the destination filesystem by refusing to preserve
hard-linked directories (which are found at least in Netapp snapshot
directories). */
if (S_ISDIR (src_type))
{
/* If src_path and earlier_file refer to the same directory entry,
then warn about copying a directory into itself. */
if (same_name (src_path, earlier_file))
{
error (0, 0, _("cannot copy a directory, %s, into itself, %s"),
quote_n (0, top_level_src_path),
quote_n (1, top_level_dst_path));
*copy_into_self = 1;
}
else
{
error (0, 0, _("will not create hard link %s to directory %s"),
quote_n (0, dst_path), quote_n (1, earlier_file));
}
goto un_backup;
}
{
int link_failed;
link_failed = link (earlier_file, dst_path);
/* If the link failed because of an existing destination,
remove that file and then call link again. */
if (link_failed && errno == EEXIST)
{
if (unlink (dst_path))
{
error (0, errno, _("cannot remove %s"), quote (dst_path));
goto un_backup;
}
link_failed = link (earlier_file, dst_path);
}
if (link_failed)
{
error (0, errno, _("cannot create hard link %s to %s"),
quote_n (0, dst_path), quote_n (1, earlier_file));
goto un_backup;
}
return 0;
}
}
if (x->move_mode)
{
if (rename (src_path, dst_path) == 0)
{
if (x->verbose && S_ISDIR (src_type))
printf ("%s -> %s\n", quote_n (0, src_path), quote_n (1, dst_path));
if (rename_succeeded)
*rename_succeeded = 1;
if (command_line_arg)
{
/* Record destination dev/ino/filename, so that if we are asked
to overwrite that file again, we can detect it and fail. */
/* It's fine to use the _source_ stat buffer (src_sb) to get the
_destination_ dev/ino, since the rename above can't have
changed those, and `mv' always uses lstat.
We could limit it further by operating
only on non-directories. */
record_file (x->dest_info, dst_path, &src_sb);
}
return 0;
}
/* FIXME: someday, consider what to do when moving a directory into
itself but when source and destination are on different devices. */
/* This happens when attempting to rename a directory to a
subdirectory of itself. */
if (errno == EINVAL
/* When src_path is on an NFS file system, some types of
clients, e.g., SunOS4.1.4 and IRIX-5.3, set errno to EIO
instead. Testing for this here risks misinterpreting a real
I/O error as an attempt to move a directory into itself, so
FIXME: consider not doing this. */
|| errno == EIO
/* And with SunOS-4.1.4 client and OpenBSD-2.3 server,
we get ENOTEMPTY. */
|| errno == ENOTEMPTY)
{
/* FIXME: this is a little fragile in that it relies on rename(2)
failing with a specific errno value. Expect problems on
non-POSIX systems. */
error (0, 0, _("cannot move %s to a subdirectory of itself, %s"),
quote_n (0, top_level_src_path),
quote_n (1, top_level_dst_path));
/* Note that there is no need to call forget_created here,
(compare with the other calls in this file) since the
destination directory didn't exist before. */
*copy_into_self = 1;
/* FIXME-cleanup: Don't return zero here; adjust mv.c accordingly.
The only caller that uses this code (mv.c) ends up setting its
exit status to nonzero when copy_into_self is nonzero. */
return 0;
}
/* WARNING: there probably exist systems for which an inter-device
rename fails with a value of errno not handled here.
If/as those are reported, add them to the condition below.
If this happens to you, please do the following and send the output
to the bug-reporting address (e.g., in the output of cp --help):
touch k; perl -e 'rename "k","/tmp/k" or print "$!(",$!+0,")\n"'
where your current directory is on one partion and /tmp is the other.
Also, please try to find the E* errno macro name corresponding to
the diagnostic and parenthesized integer, and include that in your
e-mail. One way to do that is to run a command like this
find /usr/include/. -type f \
| xargs grep 'define.*\<E[A-Z]*\>.*\<18\>' /dev/null
where you'd replace `18' with the integer in parentheses that
was output from the perl one-liner above.
If necessary, of course, change `/tmp' to some other directory. */
if (errno != EXDEV)
{
/* There are many ways this can happen due to a race condition.
When something happens between the initial xstat and the
subsequent rename, we can get many different types of errors.
For example, if the destination is initially a non-directory
or non-existent, but it is created as a directory, the rename
fails. If two `mv' commands try to rename the same file at
about the same time, one will succeed and the other will fail.
If the permissions on the directory containing the source or
destination file are made too restrictive, the rename will
fail. Etc. */
error (0, errno,
_("cannot move %s to %s"),
quote_n (0, src_path), quote_n (1, dst_path));
forget_created (src_sb.st_ino, src_sb.st_dev);
return 1;
}
/* The rename attempt has failed. Remove any existing destination
file so that a cross-device `mv' acts as if it were really using
the rename syscall. */
if (unlink (dst_path) && errno != ENOENT)
{
error (0, errno,
_("inter-device move failed: %s to %s; unable to remove target"),
quote_n (0, src_path), quote_n (1, dst_path));
forget_created (src_sb.st_ino, src_sb.st_dev);
return 1;
}
new_dst = 1;
}
delayed_fail = 0;
/* In certain modes (cp's --symbolic-link), and for certain file types
(symlinks and hard links) it doesn't make sense to preserve metadata,
or it's possible to preserve only some of it.
In such cases, set this variable to zero. */
preserve_metadata = 1;
if (S_ISDIR (src_type))
{
struct dir_list *dir;
/* If this directory has been copied before during the
recursion, there is a symbolic link to an ancestor
directory of the symbolic link. It is impossible to
continue to copy this, unless we've got an infinite disk. */
if (is_ancestor (&src_sb, ancestors))
{
error (0, 0, _("cannot copy cyclic symbolic link %s"),
quote (src_path));
goto un_backup;
}
/* Insert the current directory in the list of parents. */
dir = (struct dir_list *) alloca (sizeof (struct dir_list));
dir->parent = ancestors;
dir->ino = src_sb.st_ino;
dir->dev = src_sb.st_dev;
if (new_dst || !S_ISDIR (dst_sb.st_mode))
{
/* Create the new directory writable and searchable, so
we can create new entries in it. */
if (mkdir (dst_path, (src_mode & x->umask_kill) | S_IRWXU))
{
error (0, errno, _("cannot create directory %s"),
quote (dst_path));
goto un_backup;
}
/* Insert the created directory's inode and device
numbers into the search structure, so that we can
avoid copying it again. */
if (remember_created (dst_path))
goto un_backup;
if (x->verbose)
printf ("%s -> %s\n", quote_n (0, src_path), quote_n (1, dst_path));
}
/* Are we crossing a file system boundary? */
if (x->one_file_system && device != 0 && device != src_sb.st_dev)
return 0;
/* Copy the contents of the directory. */
if (copy_dir (src_path, dst_path, new_dst, &src_sb, dir, x,
copy_into_self))
{
/* Don't just return here -- otherwise, the failure to read a
single file in a source directory would cause the containing
destination directory not to have owner/perms set properly. */
delayed_fail = 1;
}
}
#ifdef S_ISLNK
else if (x->symbolic_link)
{
preserve_metadata = 0;
if (*src_path != '/')
{
/* Check that DST_PATH denotes a file in the current directory. */
struct stat dot_sb;
struct stat dst_parent_sb;
char *dst_parent;
int in_current_dir;
dst_parent = dir_name (dst_path);
in_current_dir = (STREQ (".", dst_parent)
/* If either stat call fails, it's ok not to report
the failure and say dst_path is in the current
directory. Other things will fail later. */
|| stat (".", &dot_sb)
|| stat (dst_parent, &dst_parent_sb)
|| SAME_INODE (dot_sb, dst_parent_sb));
free (dst_parent);
if (! in_current_dir)
{
error (0, 0,
_("%s: can make relative symbolic links only in current directory"),
quote (dst_path));
goto un_backup;
}
}
if (symlink (src_path, dst_path))
{
error (0, errno, _("cannot create symbolic link %s to %s"),
quote_n (0, dst_path), quote_n (1, src_path));
goto un_backup;
}
}
#endif
else if (x->hard_link)
{
preserve_metadata = 0;
if (link (src_path, dst_path))
{
error (0, errno, _("cannot create link %s"), quote (dst_path));
goto un_backup;
}
}
else if (S_ISREG (src_type)
|| (x->copy_as_regular && !S_ISDIR (src_type)
#ifdef S_ISLNK
&& !S_ISLNK (src_type)
#endif
))
{
copied_as_regular = 1;
/* POSIX says the permission bits of the source file must be
used as the 3rd argument in the open call, but that's not consistent
with historical practice. */
if (copy_reg (src_path, dst_path, x,
get_dest_mode (x, src_mode), &new_dst, &src_sb))
goto un_backup;
}
else
#ifdef S_ISFIFO
if (S_ISFIFO (src_type))
{
if (mkfifo (dst_path, get_dest_mode (x, src_mode)))
{
error (0, errno, _("cannot create fifo %s"), quote (dst_path));
goto un_backup;
}
}
else
#endif
if (S_ISBLK (src_type) || S_ISCHR (src_type)
#ifdef S_ISSOCK
|| S_ISSOCK (src_type)
#endif
)
{
if (mknod (dst_path, get_dest_mode (x, src_mode), src_sb.st_rdev))
{
error (0, errno, _("cannot create special file %s"),
quote (dst_path));
goto un_backup;
}
}
else
#ifdef S_ISLNK
if (S_ISLNK (src_type))
{
char *src_link_val = xreadlink (src_path);
if (src_link_val == NULL)
{
error (0, errno, _("cannot read symbolic link %s"), quote (src_path));
goto un_backup;
}
if (!symlink (src_link_val, dst_path))
free (src_link_val);
else
{
int saved_errno = errno;
int same_link = 0;
if (x->update && !new_dst && S_ISLNK (dst_sb.st_mode))
{
/* See if the destination is already the desired symlink. */
size_t src_link_len = strlen (src_link_val);
char *dest_link_val = (char *) alloca (src_link_len + 1);
int dest_link_len = readlink (dst_path, dest_link_val,
src_link_len + 1);
if ((size_t) dest_link_len == src_link_len
&& strncmp (dest_link_val, src_link_val, src_link_len) == 0)
same_link = 1;
}
free (src_link_val);
if (! same_link)
{
error (0, saved_errno, _("cannot create symbolic link %s"),
quote (dst_path));
goto un_backup;
}
}
/* There's no need to preserve timestamps or permissions. */
preserve_metadata = 0;
if (x->preserve_ownership)
{
/* Preserve the owner and group of the just-`copied'
symbolic link, if possible. */
# if HAVE_LCHOWN
if (DO_CHOWN (lchown, dst_path, src_sb.st_uid, src_sb.st_gid))
{
error (0, errno, _("failed to preserve ownership for %s"),
dst_path);
goto un_backup;
}
# else
/* Can't preserve ownership of symlinks.
FIXME: maybe give a warning or even error for symlinks
in directories with the sticky bit set -- there, not
preserving owner/group is a potential security problem. */
# endif
}
}
else
#endif
{
error (0, 0, _("%s has unknown file type"), quote (src_path));
goto un_backup;
}
if (command_line_arg)
record_file (x->dest_info, dst_path, NULL);
if ( ! preserve_metadata)
return 0;
/* POSIX says that `cp -p' must restore the following:
- permission bits
- setuid, setgid bits
- owner and group
If it fails to restore any of those, we may give a warning but
the destination must not be removed.
FIXME: implement the above. */
/* Adjust the times (and if possible, ownership) for the copy.
chown turns off set[ug]id bits for non-root,
so do the chmod last. */
if (x->preserve_timestamps)
{
struct utimbuf utb;
/* There's currently no interface to set file timestamps with
better than 1-second resolution, so discard any fractional
part of the source timestamp. */
utb.actime = src_sb.st_atime;
utb.modtime = src_sb.st_mtime;
if (utime (dst_path, &utb))
{
error (0, errno, _("preserving times for %s"), quote (dst_path));
if (x->require_preserve)
return 1;
}
}
/* Avoid calling chown if we know it's not necessary. */
if (x->preserve_ownership
&& (new_dst || !SAME_OWNER_AND_GROUP (src_sb, dst_sb)))
{
ran_chown = 1;
if (DO_CHOWN (chown, dst_path, src_sb.st_uid, src_sb.st_gid))
{
error (0, errno, _("failed to preserve ownership for %s"),
quote (dst_path));
if (x->require_preserve)
return 1;
}
}
#if HAVE_STRUCT_STAT_ST_AUTHOR
/* Preserve the st_author field. */
{
file_t file = file_name_lookup (dst_path, 0, 0);
if (file_chauthor (file, src_sb.st_author))
error (0, errno, _("failed to preserve authorship for %s"),
quote (dst_path));
mach_port_deallocate (mach_task_self (), file);
}
#endif
/* Permissions of newly-created regular files were set upon `open' in
copy_reg. But don't return early if there were any special bits and
we had to run chown, because the chown must have reset those bits. */
if ((new_dst && copied_as_regular)
&& !(ran_chown && (src_mode & ~S_IRWXUGO)))
return delayed_fail;
if ((x->preserve_mode || new_dst)
&& (x->copy_as_regular || S_ISREG (src_type) || S_ISDIR (src_type)))
{
if (chmod (dst_path, get_dest_mode (x, src_mode)))
{
error (0, errno, _("setting permissions for %s"), quote (dst_path));
if (x->set_mode || x->require_preserve)
return 1;
}
}
return delayed_fail;
un_backup:
/* We have failed to create the destination file.
If we've just added a dev/ino entry via the remember_copied
call above (i.e., unless we've just failed to create a hard link),
remove the entry associating the source dev/ino with the
destination file name, so we don't try to `preserve' a link
to a file we didn't create. */
if (earlier_file == NULL)
forget_created (src_sb.st_ino, src_sb.st_dev);
if (dst_backup)
{
if (rename (dst_backup, dst_path))
error (0, errno, _("cannot un-backup %s"), quote (dst_path));
else
{
if (x->verbose)
printf (_("%s -> %s (unbackup)\n"),
quote_n (0, dst_backup), quote_n (1, dst_path));
}
}
return 1;
}