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nixpkgs/pkgs/applications/version-management/cvs/getcwd-chroot.patch
Ludovic Courtès 98b73c1306 cvs: Fix getcwd() from Gnulib so that it works in chroots. 
svn path=/nixpkgs/trunk/; revision=19564
2010-01-20 11:08:50 +00:00

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Fix Gnulib's getcwd in chroots.
From Debian bug #456164, http://bugs.debian.org/456164 .
--- cvs-1.12.13.orig/debian/patches/20_readdir_errno
+++ cvs-1.12.13/debian/patches/20_readdir_errno
@@ -0,0 +1,121 @@
+# From Gnulib:
+# http://git.savannah.gnu.org/gitweb/?p=gnulib.git;a=commitdiff;h=0b78641d85af3b72e3b9d94cb7b94e45f3c08ee5
+# We don't need this directly, but it's required so that 21_getcwd_chroot
+# applies cleanly.
+#
+# 2005-10-29 Paul Eggert <eggert@cs.ucla.edu>
+#
+# * getcwd.c (__getcwd): Don't assume that system calls after readdir
+# leave errno alone. Problem reported by Dmitry V. Levin.
+
+--- cvs-1.12.13-old/lib/getcwd.c
++++ cvs-1.12.13/lib/getcwd.c
+@@ -201,6 +201,8 @@ __getcwd (char *buf, size_t size)
+ ino_t dotino;
+ bool mount_point;
+ int parent_status;
++ size_t dirroom;
++ size_t namlen;
+
+ /* Look at the parent directory. */
+ #ifdef AT_FDCWD
+@@ -241,11 +243,20 @@ __getcwd (char *buf, size_t size)
+ goto lose;
+ dotlist[dotlen++] = '/';
+ #endif
+- /* Clear errno to distinguish EOF from error if readdir returns
+- NULL. */
+- __set_errno (0);
+- while ((d = __readdir (dirstream)) != NULL)
++ for (;;)
+ {
++ /* Clear errno to distinguish EOF from error if readdir returns
++ NULL. */
++ __set_errno (0);
++ d = __readdir (dirstream);
++ if (d == NULL)
++ {
++ if (errno == 0)
++ /* EOF on dirstream, which means that the current directory
++ has been removed. */
++ __set_errno (ENOENT);
++ goto lose;
++ }
+ if (d->d_name[0] == '.' &&
+ (d->d_name[1] == '\0' ||
+ (d->d_name[1] == '.' && d->d_name[2] == '\0')))
+@@ -303,48 +314,38 @@ __getcwd (char *buf, size_t size)
+ break;
+ }
+ }
+- if (d == NULL)
+- {
+- if (errno == 0)
+- /* EOF on dirstream, which means that the current directory
+- has been removed. */
+- __set_errno (ENOENT);
+- goto lose;
+- }
+- else
+- {
+- size_t dirroom = dirp - dir;
+- size_t namlen = _D_EXACT_NAMLEN (d);
+
+- if (dirroom <= namlen)
++ dirroom = dirp - dir;
++ namlen = _D_EXACT_NAMLEN (d);
++
++ if (dirroom <= namlen)
++ {
++ if (size != 0)
+ {
+- if (size != 0)
+- {
+- __set_errno (ERANGE);
+- goto lose;
+- }
+- else
+- {
+- char *tmp;
+- size_t oldsize = allocated;
++ __set_errno (ERANGE);
++ goto lose;
++ }
++ else
++ {
++ char *tmp;
++ size_t oldsize = allocated;
+
+- allocated += MAX (allocated, namlen);
+- if (allocated < oldsize
+- || ! (tmp = realloc (dir, allocated)))
+- goto memory_exhausted;
++ allocated += MAX (allocated, namlen);
++ if (allocated < oldsize
++ || ! (tmp = realloc (dir, allocated)))
++ goto memory_exhausted;
+
+- /* Move current contents up to the end of the buffer.
+- This is guaranteed to be non-overlapping. */
+- dirp = memcpy (tmp + allocated - (oldsize - dirroom),
+- tmp + dirroom,
+- oldsize - dirroom);
+- dir = tmp;
+- }
++ /* Move current contents up to the end of the buffer.
++ This is guaranteed to be non-overlapping. */
++ dirp = memcpy (tmp + allocated - (oldsize - dirroom),
++ tmp + dirroom,
++ oldsize - dirroom);
++ dir = tmp;
+ }
+- dirp -= namlen;
+- memcpy (dirp, d->d_name, namlen);
+- *--dirp = '/';
+ }
++ dirp -= namlen;
++ memcpy (dirp, d->d_name, namlen);
++ *--dirp = '/';
+
+ thisdev = dotdev;
+ thisino = dotino;
--- cvs-1.12.13.orig/debian/patches/21_getcwd_chroot
+++ cvs-1.12.13/debian/patches/21_getcwd_chroot
@@ -0,0 +1,172 @@
+# From Gnulib:
+# http://git.savannah.gnu.org/gitweb/?p=gnulib.git;a=commitdiff;h=79c0a43808d9ca85acd04600149fc1a9b75bd1b9
+#
+# 2006-07-03 Paul Eggert <eggert@cs.ucla.edu>
+#
+# Merge from coreutils.
+#
+# 2006-03-19 Jim Meyering <jim@meyering.net>
+#
+# Work even in a chroot where d_ino values for entries in "/"
+# don't match the stat.st_ino values for the same names.
+# * getcwd.c (__getcwd): When no d_ino value matches the target inode
+# number, iterate through all entries again, using lstat instead.
+# Reported by Kenshi Muto in http://bugs.debian.org/355810, and by
+# Zouhir Hafidi in https://bugzilla.redhat.com/bugzilla/190656.
+#
+# * getcwd.c (__getcwd): Clarify a comment.
+# Use memcpy in place of a call to strcpy.
+
+--- cvs-1.12.13-old/lib/getcwd.c
++++ cvs-1.12.13/lib/getcwd.c
+@@ -211,6 +211,7 @@ __getcwd (char *buf, size_t size)
+ int parent_status;
+ size_t dirroom;
+ size_t namlen;
++ bool use_d_ino = true;
+
+ /* Look at the parent directory. */
+ #ifdef AT_FDCWD
+@@ -257,11 +258,26 @@ __getcwd (char *buf, size_t size)
+ NULL. */
+ __set_errno (0);
+ d = __readdir (dirstream);
++
++ /* When we've iterated through all directory entries without finding
++ one with a matching d_ino, rewind the stream and consider each
++ name again, but this time, using lstat. This is necessary in a
++ chroot on at least one system (glibc-2.3.6 + linux 2.6.12), where
++ .., ../.., ../../.., etc. all had the same device number, yet the
++ d_ino values for entries in / did not match those obtained
++ via lstat. */
++ if (d == NULL && errno == 0 && use_d_ino)
++ {
++ use_d_ino = false;
++ rewinddir (dirstream);
++ d = __readdir (dirstream);
++ }
++
+ if (d == NULL)
+ {
+ if (errno == 0)
+- /* EOF on dirstream, which means that the current directory
+- has been removed. */
++ /* EOF on dirstream, which can mean e.g., that the current
++ directory has been removed. */
+ __set_errno (ENOENT);
+ goto lose;
+ }
+@@ -269,58 +285,65 @@ __getcwd (char *buf, size_t size)
+ (d->d_name[1] == '\0' ||
+ (d->d_name[1] == '.' && d->d_name[2] == '\0')))
+ continue;
+- if (MATCHING_INO (d, thisino) || mount_point)
++
++ if (use_d_ino)
+ {
+- int entry_status;
++ bool match = (MATCHING_INO (d, thisino) || mount_point);
++ if (! match)
++ continue;
++ }
++
++ {
++ int entry_status;
+ #ifdef AT_FDCWD
+- entry_status = fstatat (fd, d->d_name, &st, AT_SYMLINK_NOFOLLOW);
++ entry_status = fstatat (fd, d->d_name, &st, AT_SYMLINK_NOFOLLOW);
+ #else
+- /* Compute size needed for this file name, or for the file
+- name ".." in the same directory, whichever is larger.
+- Room for ".." might be needed the next time through
+- the outer loop. */
+- size_t name_alloc = _D_ALLOC_NAMLEN (d);
+- size_t filesize = dotlen + MAX (sizeof "..", name_alloc);
+-
+- if (filesize < dotlen)
+- goto memory_exhausted;
+-
+- if (dotsize < filesize)
+- {
+- /* My, what a deep directory tree you have, Grandma. */
+- size_t newsize = MAX (filesize, dotsize * 2);
+- size_t i;
+- if (newsize < dotsize)
+- goto memory_exhausted;
+- if (dotlist != dots)
+- free (dotlist);
+- dotlist = malloc (newsize);
+- if (dotlist == NULL)
+- goto lose;
+- dotsize = newsize;
+-
+- i = 0;
+- do
+- {
+- dotlist[i++] = '.';
+- dotlist[i++] = '.';
+- dotlist[i++] = '/';
+- }
+- while (i < dotlen);
+- }
+-
+- strcpy (dotlist + dotlen, d->d_name);
+- entry_status = __lstat (dotlist, &st);
++ /* Compute size needed for this file name, or for the file
++ name ".." in the same directory, whichever is larger.
++ Room for ".." might be needed the next time through
++ the outer loop. */
++ size_t name_alloc = _D_ALLOC_NAMLEN (d);
++ size_t filesize = dotlen + MAX (sizeof "..", name_alloc);
++
++ if (filesize < dotlen)
++ goto memory_exhausted;
++
++ if (dotsize < filesize)
++ {
++ /* My, what a deep directory tree you have, Grandma. */
++ size_t newsize = MAX (filesize, dotsize * 2);
++ size_t i;
++ if (newsize < dotsize)
++ goto memory_exhausted;
++ if (dotlist != dots)
++ free (dotlist);
++ dotlist = malloc (newsize);
++ if (dotlist == NULL)
++ goto lose;
++ dotsize = newsize;
++
++ i = 0;
++ do
++ {
++ dotlist[i++] = '.';
++ dotlist[i++] = '.';
++ dotlist[i++] = '/';
++ }
++ while (i < dotlen);
++ }
++
++ memcpy (dotlist + dotlen, d->d_name, _D_ALLOC_NAMLEN (d));
++ entry_status = __lstat (dotlist, &st);
+ #endif
+- /* We don't fail here if we cannot stat() a directory entry.
+- This can happen when (network) file systems fail. If this
+- entry is in fact the one we are looking for we will find
+- out soon as we reach the end of the directory without
+- having found anything. */
+- if (entry_status == 0 && S_ISDIR (st.st_mode)
+- && st.st_dev == thisdev && st.st_ino == thisino)
+- break;
+- }
++ /* We don't fail here if we cannot stat() a directory entry.
++ This can happen when (network) file systems fail. If this
++ entry is in fact the one we are looking for we will find
++ out soon as we reach the end of the directory without
++ having found anything. */
++ if (entry_status == 0 && S_ISDIR (st.st_mode)
++ && st.st_dev == thisdev && st.st_ino == thisino)
++ break;
++ }
+ }
+
+ dirroom = dirp - dir;
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