Date: Mon, 04 Sep 2000 10:40:42 +0300 From: Maxim Sobolev <sobomax@FreeBSD.org> To: ports@FreeBSD.org Cc: asami@FreeBSD.org Subject: Handling of symlinks to directory in pkg_delete [patch for review] Message-ID: <39B351FA.A6CFD24F@FreeBSD.org>
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Hi!
I wonder if anybody noticed that handling of symlinks in pkg_delete is somewhat
broken. Particularly, the problems exist with symlinks to a directories. The
pkg_delete code considers those symlinks as a directories (if the referred
directory exists), however they are not, and thus tries to delete it using
rmdir(2), which obviously doesn't work. The workaround exists to delete
directory symlink points to first and only then remove corresponding symlinks,
however it looks like an ugly hack (see lesstif's PLIST for example). The
attached patch is expected to solve this problem. Also in this message I'm
attaching small fake package, which exposes the bug (it consist of one symlink
and one directory this symlink points to).
-Maxim
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name="pkg_install-symlinks.to.dir.handling-diff"
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filename="pkg_install-symlinks.to.dir.handling-diff"
--- pkg_install/lib/file.c 2000/09/02 19:31:59 1.1
+++ pkg_install/lib/file.c 2000/09/02 19:39:30
@@ -40,7 +40,7 @@
return FALSE;
}
-/* Quick check to see if something is a directory */
+/* Quick check to see if something is a directory or symlink to a directory */
Boolean
isdir(char *fname)
{
@@ -54,7 +54,7 @@
return FALSE;
}
-/* Check to see if file is a dir, and is empty */
+/* Check to see if file is a dir or symlink to a dir, and is empty */
Boolean
isemptydir(char *fname)
{
@@ -77,6 +77,10 @@
return FALSE;
}
+/*
+ * Returns TRUE if file is a regular file or symlink pointing to a regular
+ * file
+ */
Boolean
isfile(char *fname)
{
@@ -86,8 +90,11 @@
return FALSE;
}
-/* Check to see if file is a file and is empty. If nonexistent or not
- a file, say "it's empty", otherwise return TRUE if zero sized. */
+/*
+ * Check to see if file is a file or symlink pointing to a file and is empty.
+ * If nonexistent or not a file, say "it's empty", otherwise return TRUE if
+ * zero sized.
+ */
Boolean
isemptyfile(char *fname)
{
@@ -97,6 +104,16 @@
return FALSE;
}
return TRUE;
+}
+
+/* Returns TRUE if file is a symbolic link. */
+Boolean
+issymlink(char *fname)
+{
+ struct stat sb;
+ if (lstat(fname, &sb) != FAIL && S_ISLNK(sb.st_mode))
+ return TRUE;
+ return FALSE;
}
/* Returns TRUE if file is a URL specification */
--- pkg_install/lib/lib.h 2000/09/04 07:12:52 1.1
+++ pkg_install/lib/lib.h 2000/09/04 07:15:41
@@ -129,6 +129,7 @@
Boolean isemptyfile(char *fname);
Boolean isfile(char *);
Boolean isempty(char *);
+Boolean issymlink(char *);
Boolean isURL(char *);
char *fileGetURL(char *, char *);
char *fileFindByPath(char *, char *);
--- pkg_install/lib/plist.c 2000/09/02 19:31:59 1.1
+++ pkg_install/lib/plist.c 2000/09/02 19:32:17
@@ -390,7 +390,7 @@
case PLIST_FILE:
last_file = p->name;
sprintf(tmp, "%s/%s", Where, p->name);
- if (isdir(tmp) && fexists(tmp)) {
+ if (isdir(tmp) && fexists(tmp) && !issymlink(tmp)) {
warnx("cannot delete specified file `%s' - it is a directory!\n"
"this packing list is incorrect - ignoring delete request", tmp);
}
@@ -477,7 +477,7 @@
if (vsystem("%s -r%s %s", REMOVE_CMD, (ign_err ? "f" : ""), dir))
return 1;
}
- else if (isdir(dir)) {
+ else if (isdir(dir) && !issymlink(dir)) {
if (RMDIR(dir) && !ign_err)
return 1;
}
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