---- realpath.c.orig Fri Aug 15 19:22:17 2003
-+++ realpath.c Tue Dec 9 14:36:32 2003
-@@ -40,8 +40,27 @@
+--- realpath.c.orig 2003-08-15 19:22:17.000000000 -0700
++++ realpath.c 2004-12-04 14:47:52.000000000 -0800
+@@ -35,13 +35,35 @@
+ #include "namespace.h"
+ #include <sys/param.h>
+ #include <sys/stat.h>
++#include <sys/mount.h>
+
+ #include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
+struct attrs {
+ u_int32_t len;
+ attrreference_t name;
++ dev_t dev;
+ fsobj_type_t type;
++ fsobj_id_t id;
+ char buf[PATH_MAX];
+};
+
+static struct attrlist alist = {
+ ATTR_BIT_MAP_COUNT,
+ 0,
-+ ATTR_CMN_NAME | ATTR_CMN_OBJTYPE,
++ ATTR_CMN_NAME | ATTR_CMN_DEVID | ATTR_CMN_OBJTYPE | ATTR_CMN_OBJID,
+ 0,
+ 0,
+ 0,
/*
* char *realpath(const char *path, char resolved[PATH_MAX]);
*
-@@ -52,11 +71,12 @@
+@@ -52,13 +74,25 @@
char *
realpath(const char *path, char resolved[PATH_MAX])
{
- int serrno, slen;
+ int serrno, slen, useattrs, islink;
char left[PATH_MAX], next_token[PATH_MAX], symlink[PATH_MAX];
++ dev_t dev, lastdev;
++ struct statfs sfs;
++ static dev_t rootdev;
++ static int rootdev_inited = 0;
++ ino_t inode;
++ if (!rootdev_inited) {
++ rootdev_inited = 1;
++ if (stat("/", &sb) < 0)
++ return (NULL);
++ rootdev = sb.st_dev;
++ }
serrno = errno;
-@@ -127,6 +147,13 @@
+ symlinks = 0;
+ if (path[0] == '/') {
+@@ -80,6 +114,12 @@
+ errno = ENAMETOOLONG;
+ return (NULL);
+ }
++ if (resolved_len > 1) {
++ if (stat(resolved, &sb) < 0)
++ return (NULL);
++ lastdev = sb.st_dev;
++ } else
++ lastdev = rootdev;
+
+ /*
+ * Iterate over path components in `left'.
+@@ -127,6 +167,13 @@
}
/*
* Append the next path component and lstat() it. If
* lstat() fails we still can return successfully if
* there are no more path components left.
-@@ -136,14 +163,22 @@
+@@ -136,14 +183,72 @@
errno = ENAMETOOLONG;
return (NULL);
}
+ if (getattrlist(resolved, &alist, &attrs, sizeof(attrs), FSOPT_NOFOLLOW) == 0) {
+ useattrs = 1;
+ islink = (attrs.type == VLNK);
++ dev = attrs.dev;
++ inode = attrs.id.fid_objno;
+ } else if (errno == EOPNOTSUPP || errno == EINVAL) {
-+ if ((useattrs = lstat(resolved, &sb)) == 0)
++ if ((useattrs = lstat(resolved, &sb)) == 0) {
+ islink = S_ISLNK(sb.st_mode);
++ dev = sb.st_dev;
++ inode = sb.st_ino;
++ }
+ } else
+ useattrs = -1;
+ if (useattrs < 0) {
return (NULL);
}
- if (S_ISLNK(sb.st_mode)) {
++ if (dev != lastdev) {
++ /*
++ * We have crossed a mountpoint. For volumes like UDF
++ * the getattrlist name may not match the actual
++ * mountpoint, so we just copy the mountpoint directly.
++ * (3703138). However, the mountpoint may not be
++ * accessible, as when chroot-ed, so check first.
++ * There may be a file on the chroot-ed volume with
++ * the same name as the mountpoint, so compare device
++ * and inode numbers.
++ */
++ lastdev = dev;
++ if (statfs(resolved, &sfs) == 0 && lstat(sfs.f_mntonname, &sb) == 0 && dev == sb.st_dev && inode == sb.st_ino) {
++ /*
++ * However, it's possible that the mountpoint
++ * path matches, even though it isn't the real
++ * path in the chroot-ed environment, so check
++ * that each component of the mountpoint
++ * is a directory (and not a symlink)
++ */
++ char temp[MNAMELEN];
++ char *cp;
++ int ok = 1;
++
++ strcpy(temp, sfs.f_mntonname);
++ for(;;) {
++ if ((cp = strrchr(temp, '/')) == NULL) {
++ ok = 0;
++ break;
++ }
++ if (cp <= temp)
++ break;
++ *cp = 0;
++ if (lstat(temp, &sb) < 0 || (sb.st_mode & S_IFMT) != S_IFDIR) {
++ ok = 0;
++ break;
++ }
++ }
++ if (ok) {
++ resolved_len = strlcpy(resolved, sfs.f_mntonname, PATH_MAX);
++ continue;
++ }
++ }
++ /* if we fail, use the other methods. */
++ }
+ if (islink) {
if (symlinks++ > MAXSYMLINKS) {
errno = ELOOP;
return (NULL);
-@@ -184,7 +219,30 @@
+@@ -155,6 +260,7 @@
+ if (symlink[0] == '/') {
+ resolved[1] = 0;
+ resolved_len = 1;
++ lastdev = rootdev;
+ } else if (resolved_len > 1) {
+ /* Strip the last path component. */
+ resolved[resolved_len - 1] = '\0';
+@@ -184,7 +290,30 @@
}
}
left_len = strlcpy(left, symlink, sizeof(left));
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