2015-03-07  Andreas Gruenbacher  <agruen@gnu.org>

	Version 2.7.5
	* NEWS: Update.

	build: update gnulib submodule to latest

	Allow absolute symlinks that lead back into the working directory
	* src/safe.c (cwd_stat_errno, cwd_stat): stat() result of ".".
	(read_symlink): When a symlink is absolute, check if it leads back into the
	working directory.  If it does, strip off the prefix above the working
	directory. If the symlink points to the working directory, return an empty
	path.
	(traverse_another_path): Recognize empty paths from read_symlink().
	* tests/symlinks: Absolute symlink test cases.

2015-03-05  Andreas Gruenbacher  <agruen@gnu.org>

	Describe better how the dirfd cache works

	Use overflow safe arithmetic for counting cache misses
	* src/safe.c: We don't need a long counter if we use overflow-safe arithmetic
	here.

	Also cache resolved symlinks
	When resolving a symlink in a pathname, we traverse each path component in the
	symlink and cache all of them.  At the end, add an additional cache entry for
	the symlink itself so that we don't have to resolve the symlink again (even
	though this will usually be cached).  Skip that if the symlink's parent isn't
	in the cache anymore, though.
	* src/safe.c (free_cached_dirfd): Remove from parent here instead of in
	callers. Move close() to remove_cached_dirfd() instead.
	(insert_cached_dirfd): Only insert if the entry's parent still exists; entries
	without parent are invalid (see compare_cached_dirfds()); "top-level" entries
	have cwd as their parent.
	(new_cached_dirfd): New function split off from openat_cached().
	(openat_cached): Use new_cached_dirfd() here.
	(traverse_another_path): When starting to resolve a symlink, create an unhashed
	dirfd cache entry for the symlink lookup result. When the symlink is completely
	resolved, add that entry to the cache.

	Invalidate child dirfd cache entries when their parent goes away
	If we don't do that, a directory could be removed from the cache, a new
	directory with the same dirfd could be created, and the entries from the old
	directory would appear in the new directory.
	* src/safe.c (struct cached_dirfd): Keep track of the children of each dirfd
	cache entry.
	(remove_cached_dirfd): Remove all the entry's children from the lookup hash,
	take them off the list of children, and initialize the children's
	children_link.  Then, remove the entry itself from its parent. This has no
	effect if the entry doesn't have a parent because then, children_link is empty.
	(openat_cached): Add new dirfd cache entries to their parent's list of children
	and initialize the entry's list of children.
	(traverse_another_path): Also initialize cwd's list of children.

	Convert lru list into a list_head list
	* src/safe.c (struct cached_dirfd): Replace prev and next with a lru_link
	list_head.
	(lru_list): Turn into a list_head.
	(lru_list_add, lru_list_del, lru_list_del_init): Replace by list_add(),
	list_del(), list_del_init().
	(insert_cached_dirfd): Get to the list entry from the embedded list_head with
	the list_entry() macro.

	Add list_head based double linked list
	* src/list.h: New data structure.
	src/Makefile.am (patch_SOURCES): Add list.h.

	Invalidate dirfd less aggressively
	src/safe.c (safe_rename, safe_rmdir): Only invalidate cache entries when the
	underlying sycall succeeds and the entry actually goes away.  This keeps the
	cache filled upon speculative rmdir when the directory may not be empty, for
	example.

2015-03-05  Tim Waugh  <twaugh@redhat.com>

	Add more path traversal test cases
	* tests/symlinks: Add more path traversal test cases.

2015-03-05  Andreas Gruenbacher  <agruen@gnu.org>

	Move path traversal error reporting into main()
	* src/safe.c (traverse_another_path): Don't report errors here.
	* src/patch.c (main): Instead, recognize and report them here. Detect when an
	output file name is invalid; it doesn't make sense to try creating a
	reject file based on the same outbut file name in that case.

	Limit the number of path components
	src/safe.c (MAX_PATH_COMPONENTS): The maximum number of path components
	allowed.
	(count_path_components): New function.
	(traverse_another_path): Fail if the number of path components gets too high.

	Follow directory symlinks within the working directory
	* src/safe.c (struct symlink): A symlink to resolve.
	(push_symlink, pop_symlink): New functions.
	(read_symlink): Create a new symlink stack entry.
	(traverse_next): Follow ".." components within the working directory. When
	hitting symlinks, "follow" them by reading and returning them.
	(traverse_another_path): Recursively traverse symlinks.

	Keep track of the directory hierarchy
	* src/safe.c (struct cached_dirfd): Add parent pointer. Now that we know our
	parent, we no longer need to duplicate its directory file descriptor.
	(lookup_cached_dirfd): Don't update the lru list here.
	(insert_cached_dirfd): The lru list may now be empty even if the cache is not.
	(put_path): New function to put a path back into the lru list.
	(openat_cached): Take cached entried off the lru list.  They are added back
	in put_path().
	(traverse_another_path): Put lookup result back into the lru list with
	put_path().

2015-02-28  Andreas Gruenbacher  <agruen@gnu.org>

	Refactor traverse_another_path() and helpers
	Prepare for keeping track of the directory hierarchy:
	* src/safe.c (traverse_another_path): Pass struct cached_dirfd to
	traverse_next().
	(traverse_next, openat_cached): Pass through struct cached_dirfd.

	Move error reporting out of make_tempfile()
	* src/util.c (make_tempfile): Remove error reporting here.
	* src/inp.c (plan_b): Readd error reporting here.
	* src/patch.c (main): Likewise.
	* src/pch.c (open_patch_file): Likewise.

	Minor cosmetic changes
	* src/safe.c: Minor cosmetic changes

2015-02-22  Andreas Gruenbacher  <agruen@gnu.org>

	Fix handling of renamed files
	When a file has already been renamed, make sure it is not renamed back to its
	old name.  Reported by Guido Draheim.
	* src/patch.c (main): Make sure we never rename a file back to its previous
	name. Report when a file was renamed already.
	* tests/copy-rename: Add "already renamed" test cases.

2015-02-10  Andreas Gruenbacher  <agruen@gnu.org>

	Fix symlinks test case on some architectures
	* src/safe.c: Include util.h for say(). Define EFTYPE if it isn't defined
	already.
	(traverse_another_path): When openat fails, also check for EMLINK, EFTYPE, and
	ENOTDIR. Change the error message to "file ... is not a directory" and only
	skip the rest of the patch instead of aborting.
	* tests/symlinks: Update.

2015-02-04  Andreas Gruenbacher  <agruen@gnu.org>

	Test suite portability fixes
	Reported and fixed (mostly) by Christian Weisgerber <naddy@mips.inka.de>:
	* tests/deep-directories: Avoid the bash >& redirection operator.
	* tests/no-mode-change-git-diff: Instead of "stat -c", use "ls -l  sed".
	* tests/read-only-files: A redirection failure for a special built-in causes
	some shells (FreeBSD sh, OpenBSD sh (pdksh), some bash --posix) to exit, and
	the colon command is a special built-in. Perform the redirection in a subshell.

	Switch from gen_tempname() to try_tempname()
	* Update gnulib submodule to latest.
	* src/util.c (try_safe_open_args, try_safe_open): Arguments and callback for
	try_tempname().
	(make_tempfile): Switch from gen_tempname() to try_tempname().

2015-02-02  Andreas Gruenbacher  <agruen@gnu.org>

	Check the result of the --follow-symlinks option
	* tests/symlinks: Check the result of treating a symlink as a file with
	--follow-symlinks.

2015-02-01  Andreas Gruenbacher  <agruen@gnu.org>

	Link patch with LIB_EACCESS where needed
	* src/Makefile.am (patch_LDADD): Add LIB_EACCESS here. At least on Solaris,
	faccessat() is implemented through eaccess() which is in the "gen" library.

	Fix minor signedness warning
	* src/pch.c (intuit_diff_type): Don't assign signed dummy value to unsigned
	variable.

	Use gnulib faccessat module
	* bootstrap.conf (gnulib_modules): Add faccessat.

2015-01-31  Andreas Gruenbacher  <agruen@gnu.org>

	Upate NEWS

	Fix indentation heuristic for context diffs
	Diffs can be indented by a variable number of spaces, tabs, or X characters.
	Make sure that intuit_diff_type() only accepts context diffs where the first
	and second line are indented identically, or else another_hunk() will fail.
	* src/pch.c (intuit_diff_type): Remember the indentation of the last line. Only
	recognize context diff hunks with the same amount of indentation on the first
	and second line.
	* tests/garbage: New test case.
	* tests/Makefile.am (TESTS): Add test case.

2015-01-31  Quentin Casasnovas  <quentin.casasnovas@oracle.com>

	patch: git-diff mode: do not change permissions if there isn't an explicit mode change.

	tests: add a test case for unwanted mode changes.

	test-lib.sh: factorize require_* functions
	Since the code is identical when just checking if a utility is present on
	the system or not, we can factorize it.

2015-01-31  Andreas Gruenbacher  <agruen@gnu.org>

	Add test case for patch behind symlink
	* tests/symlinks: Add a test case where the patch file itself is in a path that
	follows a symbolic link; we want to continue allowing that.

2015-01-31  Tim Waugh  <twaugh@redhat.com>

	Allow arbitrary symlink targets again
	* src/util.c (symlink_target_is_valid): Remove.
	(move_file): Remove symlink target checking.
	* tests/symlinks: Update test case.

2015-01-31  Andreas Gruenbacher  <agruen@gnu.org>

	Update list of gnulib modules used
	* bootstrap.conf (gnulib_modules): Remove lchmod, lstat, mkdir, readlink,
	rename, mkdir, symlink, unlink, utimens. Add fchownat, fchmodat, fstatat,
	mkdirat, openat, readlinkat, renameat, symlinkat, unlinkat, utimensat.
	* src/util.h: Don't include <utimens.h> anymore.

	Use symlink-safe system call replacements
	Use the symlink-safe replacements for system calls in many places throughout
	the code: In some places this makes patch safe against path traversal attacks;
	in other places, it saves the kernel from having to re-traverse the pathnames.
	* src/inp.c (plan_b): Use safe_open() + fdopen() instead of fopen().
	* src/util.c (copy_attr): Document why we are safe here.
	(create_backup): Use safe_open() instead of creat().

2015-01-31  Tim Waugh  <twaugh@redhat.com>

	Add symlink-safe system call replacements
	Add wrappers around system calls that traverse relative pathnames without
	following symlinks. Written by Tim Waugh <twaugh@redhat.com> and Andreas
	Gruenbacher <agruenba@redhat.com>.
	* src/safe.h: Declare functions here.
	* src/safe.c: Implement safe_* system call replacements that do not follow
	symlinks along pathnames. Pathname components are resolved with openat().
	Lookup results are cached to keep the overhead reasonably low.
	* tests/deep-directories: New path traversal cache test.
	* src/Makefile.am (patch_SOURCES): Add safe.[ch].
	* tests/Makefile.am (TESTS): Add new test.

2015-01-31  Andreas Gruenbacher  <agruen@gnu.org>

	build: update gnulib submodule to latest

2015-01-31  Tim Waugh  <twaugh@redhat.com>

	Avoid closing file descriptor twice
	* src/patch.c (main): Make sure we don't close() outfd after passing it on to
	fdopen(): the file descriptor might have been reused in the meantime.

2015-01-29  Andreas Gruenbacher  <agruen@gnu.org>

	Remove unused variable
	* src/pch.c (name_is_valid): Remove unused variable.

2015-01-22  Andreas Gruenbacher  <agruen@gnu.org>

	Fix the fix for CVE-2015-1196
	* src/util.c (filename_is_safe): New function split off from name_is_valid().
	(symlink_target_is_valid): Explain why we cannot have absolute symlinks or
	symlinks with ".." components for now.
	(move_file): Move absolute filename check here and explain.
	* tests/symlinks: Put test case with ".." symlink in comments for now.
	* NEWS: Add CVE number.

2015-01-21  Andreas Gruenbacher  <agruen@gnu.org>

	For renames and copies, make sure that both file names are valid
	* src/patch.c (main): Allow there_is_another_patch() to set the
	skip_rest_of_patch flag.
	* src/pch.c (intuit_diff_type): For renames and copies, also check the "other"
	file name.
	(pch_copy, pch_rename): Now that both names are checked in intuit_diff_type(),
	we know they are defined here.

2015-01-20  Andreas Gruenbacher  <agruen@gnu.org>

	Fail when out of memory in set_hunkmax()
	src/pch.c (another_hunk): Call set_hunkmax() from here to make sure it is
	called even when falling back from plan A to plan B.
	(open_patch_file): No need to call set_hunkmax() anymore.
	src/pch.c (set_hunkmax): Fail when out of memory. Make static.
	src/pch.h: Remove set_hunkmax() prototype.

	Don't try applying hunks at offsets that can't work
	* src/patch.c (locate_hunk): Start trying to apply the hunk at the minimum
	offset which puts the hunk in the valid range of lines. This will often still
	be offset 0.

2015-01-20  Andreas Gruenbacher  <andreas.gruenbacher@gmail.com>

	Move symlink_target_is_valid() and cwd_is_root()
	* src/util.c: Move symlink_target_is_valid() and cwd_is_root() here from
	src/pch.c.

2015-01-19  Andreas Gruenbacher  <andreas.gruenbacher@gmail.com>

	Make sure symlinks don't point outside working directory (CVE-2015-119)
	When creating symlinks from git-style patches, make sure the symlinks don't
	point above the current working directory.  Otherwise, a subsequent patch could
	use the symlink to write outside the working directory.

	* src/pch.c (symlink_target_is_valid): New function to check for valid symlink
	targets.
	* src/util.c (move_file): Use symlink_target_is_valid() here.
	* tests/symlinks: Add valid and invalid symlink test cases.

2014-11-30  Andreas Gruenbacher  <agruen@linbit.com>

	Add line number overflow checking
	* bootstrap.conf: use intprops module.
	* src/common.h: Define LINENUM_MIN and LINENUM_MAX macros.
	* src/pch.c (another_hunk): Add line number overflow checking.  Based on Robert
	C. Seacord's INT32-C document for integer overflow checking and Tobias
	Stoeckmann's "integer overflows and oob memory access" patch for FreeBSD.

2014-11-30  Andreas Gruenbacher  <agruen@linbit.com>

	More savebuf/savestr error handling
	* bootstrap.conf: use xmemdup0 module.
	* src/pch.c (there_is_another_patch): Use xmemdup0 instead of savebuf when we
	cannot recover from out-of-memory situations.
	(intuit_diff_type): Likewise, use xstrdup instead of savestr.
	(another_hunk): Handle the case when savestr returns NULL.
	* src/util.c (fetchname, parse_name): Use xmemdup0 instead of savebuf when we
	cannot recover from out-of-memory situations.

	Bugs pointed out by Tobias Stoeckmann <tobias@stoeckmann.org>.

2014-11-30  Tobias Stoeckmann  <tobias@stoeckmann.org>

	savebuf/savestr error handling
	* src/patch.c (get_some_switches): The function savebuf (and therefore savestr)
	copies strings using malloc.  If malloc fails, NULL is returned.  This is
	intentional behavior so that in case of failure during "plan a" patching, "plan
	b" can step in.  The return value has to be properly checked for NULL.  If the
	return value must not be NULL, use xstrdup instead.

2014-11-30  Andreas Gruenbacher  <andreas.gruenbacher@gmail.com>

	build: update gnulib submodule to latest
	* src/merge.c (compute_changes): The TOO_EXPENSIVE heuristic in diffseq has
	been removed, including compareseq's find_minimal parameter and the context's
	too_expensive limit.  Adjust.

2014-11-10  Jean Delvare  <jdelvare@suse.de>

	Drop useless test in another_hunk()
	src/pch.c (another_hunk): This test will always succeed.

2014-10-30  Tobias Stoeckmann  <tobias@stoeckmann.org>

	Buffer overflow on malicious input file
	There is a hard to reach but possible buffer overflow when using
	patch with a very large (modified) input file.  I doubt you will ever
	see this with a 64 bit system, but it's possible with 32 bit:

	$ echo hello > file1
	$ echo world > file2
	$ diff -Nau file1 file2 > file.diff

	Nothing fancy so far.  Adjust file1 so it contains at least one line that
	is 2 GB in size.  Larger is fine too, but stay below 4 GB.

	$ tr '\0' c < /dev/zero | dd bs=1K count=2097152 of=file1

	Now try to patch it.

	$ patch -Np0 -i file.diff
	Segmentation fault

	The issue is in patch's "plan b" strategy  (If your system would still
	want to use "plan a", force patch to use "plan b" through debug flag).

	Plan b writes lines into a temporary file, with equally long lines, so
	it can use a buffer mechanism to access them in a kind of randomly
	fassion.  In order to do that, it retrieves the longest line.

	In this example, it will encounter the 2 GB line and stores that as the
	longest one.  Afterwards it will adjust the tibufsize variable to be
	large enough:

	  for (tibufsize = TIBUFSIZE_MINIMUM;  tibufsize < maxlen;  tibufsize <<= 1)
	    /* do nothing */ ;

	Due to maxlen's size (2 GB), tibufsize will be SIZE_T_MAX, i.e. 4 GB.
	A few lines later it allocates space for the tibuf buffers:

	  tibuf[0] = xmalloc (2 * tibufsize);
	  tibuf[1] = tibuf[0] + tibufsize;

	This will allocate 0 bytes because tibufsize overflowed.  The next
	time patch writes into the buffer, a segmentation fault will occur...
	Depends on your system how long it takes until that happens. ;)

	The fix is simple:  Bail out on lines that are too long.  Patch already
	does that for files that have too many lines.

2014-08-13  Andreas Gruenbacher  <agruen@linbit.com>

	Improve error message when refusing to delete file
	* src/patch.c: Improve error message.
	* tests/create-delete: Update the test case.

2013-12-09  Andreas Gruenbacher  <agruen@linbit.com>

	Correct the --help text of option --merge
	* src/patch.c (option_help): The --merge option does not have a short
	form; update the help text.

2013-08-19  Steven Rostedt  <rostedt@goodmis.org>

	Preserve function names in reject files
	* src/patch.c (main): Preserve function names in reject files.
	* tests/reject-format: Update the test case.

2013-07-30  Andreas Gruenbacher  <agruen@linbit.com>

	Test case for the dry-run fix
	* tests/create-directory: Add test case here.

	In dry-run mode, create temporary files in a temporary directory
	* src/util.c (make_tempfile): Do not create temporary files in the final output
	directory when in dry-run mode: the path may be read-only.  In addition, we do
	not want to leave intermediary empty output directories around.

2013-06-18  Eric S. Raymond  <esr@thyrsus.com>

	Fix some formatting problems in the manpage
	* patch.1: Use higher-level markup that translates better into HTML and other
	formats.  (With changes by Andreas Gruenbacher.)

2013-05-02  Stefano Lattarini  <stefano.lattarini@gmail.com>  (tiny change)

	build: don't use -Werror in AM_INIT_AUTOMAKE
	Doing so prevents bootstrapping with bleeding-edge autotools,
	because of harmless deprecation warnings (that are not planned
	to become hard errors for at least a few years to come).  And
	unfortunately, options in AM_INIT_AUTOMAKE take precedence over
	those given on the command line (this is a long-time wart of
	automake).

	* configure.ac (AM_INIT_AUTOMAKE): Drop '-Werror' option.

2013-03-10  Andreas Gruenbacher  <agruen@linbit.com>

	Fix removing empty directories
	Reported by Thomas Moschny <thomas.moschny@gmx.de>:
	src/patch.c (main): Temporary output files are created in the same directory as
	the output file.  Make sure to remove them before removing empty files and
	their empty ancestor directories; else the directories won't be empty.
	tests/remove-directories: Add directory removal test case.
	tests/Makefile.am (TESTS): Add new test case.

2013-01-03  Andreas Gruenbacher  <agruen@linbit.com>

	Clarify the description of option --forward
	* patch.man: Clarify the description of option --forward.

2012-10-04  Andreas Gruenbacher  <agruen@linbit.com>

	Initialize data structures early enough
	* src/patch.c (main): Initialize data structures early enough, before error
	paths can access them.
	* tests/bad-usage: Test bad command line usage.
	* tests/Makefile.am (TESTS): Add bad-usage here.

2012-09-30  Andreas Gruenbacher  <agruen@linbit.com>

	Don't fail test suite if printf '\0' is broken
	* tests/create-delete: Skip binary diff test if printf '\0' is broken.

2012-09-28  Andreas Gruenbacher  <agruen@linbit.com>

	Version 2.7.1

	build: update gnulib submodule to latest

	Repair 'backup of unmodified file' test
	tests/create-delete: Repair 'backup of unmodified file' test.

	Use gnulib errno module instead of our own default ENOTSUP fallback
	* bootstrap.conf (gnulib_modules): Add errno module.
	* src/common.h: Remove ENOTSUP fallback.

	Trailing whitespace fix
	* NEWS: Trailing whitespace fix.

2012-09-26  Andreas Gruenbacher  <agruen@linbit.com>

	Improve the previous commit
	* src/patch.c: Only print the "file is not empty after patch" message when
	trying to delete the output file.  Say that we were trying to delete the file.
	* tests/create-delete: Fix the expected messages.  Add test cases for the
	--remove-empty-files and --posix options.
	* NEWS: Better describe this change.

2012-09-25  Andreas Gruenbacher  <agruen@linbit.com>

	Only expect files to become empty if the patch says so
	Test cases based on patches from Dmitry V. Levin <ldv@altlinux.org>.
	* src/patch.c (main): Only expect files to become empty if the patch says so.
	* NEWS: Document this change.
	* tests/create-delete: Add (more) empty vs. non-empty test cases.

2012-09-22  Jim Meyering  <meyering@redhat.com>

	build: avoid gcc warnings from -Wsuggest-attribute=format
	* configure.ac (WARN_CFLAGS): Disable -Wsuggest-attribute=format,
	to avoid some warnings that are not worth working around.

2012-09-22  Andreas Gruenbacher  <agruen@linbit.com>

	Update NEWS
	* NEWS: Update.

	Improve messages when in --dry-run mode
	* src/patch.c (main): Say that we are checking a file and not that we are
	patching it in --dry-run mode.  Don't say "saving rejects to file" when we
	don't create reject files.
	* tests/reject-format: Add rejects with --dry-run test case.
	* tests/bad-filenames, tests/fifo, tests/mixed-patch-types: Update.

	Improve handling of LF vs. CRLF line endings
	* src/patch.c (check_line_endings): New function.
	(main): When a hunk fails, report when the line endings differ between the
	input file and the patch.
	* src/pch.c (there_is_another_patch): When saying that we strip trailing CRs,
	also say how to turn this off.
	* tests/crlf-handling: Update changed messages.  Add test case that fails.

	Ignore when preserving extended attributes is not supported or allowed
	* src/common.h (ENOTSUP): Make sure this error code is defined.
	* src/util.c (set_file_attributes): Ignore ENOSYS, ENOTSUP, and EPERM errors.

2012-09-20  Andreas Gruenbacher  <agruen@linbit.com>

	Add a missing explanation in the tests/crlf-handling test case
	* tests/crlf-handling: Add explanation.

2012-09-19  Andreas Gruenbacher  <agruen@linbit.com>

	Add --follow-symlinks option for backwards compatibility
	* src/common.h (follow_symlinks): New variable.
	* src/patch.c (longopts): Add new --follow-symlinks option.
	(get_some_switches): Recognize the new option.
	* src/util.c (stat_file): Follow symlinks if requested.
	* patch.man: Document the new option.
	* tests/symlinks: Add test case.

	Introduce function to lstat all input files
	* src/util.c (stat_file): New function.
	(move_file): Use here.
	* src/util.h (stat_file): Declare here.
	* src/inp.c (get_input_file): Use here.
	* src/patch.c (main): Use here.
	(delete_file_later): Use here.
	* src/pch.c (there_is_another_patch): Use here.
	(intuit_diff_type): Use here.

	Use stat where we want to follow symlinks
	* src/pch.c (prefix_components): Follow symlinks.
	(cwd_is_root): Follow symlinks.

	Document command-line options in alphabetic order
	* patch.man: The options are mostly listen in alphabetical order; stick to
	that.

2012-09-18  Andreas Gruenbacher  <agruen@linbit.com>

	Fix file truncation when switching from git diff to non-git diff
	* src/patch.c (main): Output queued output files only when switching from a git
	diff to a non-git diff.  This can modify the input file, so make sure to
	stat() it again.
	* tests/concat-git-diff: Add test case growing a file with a git diff and then
	with a non-git diff; without this fix; the result would be truncated.

	Rename get_input_file() parameter to clarify code
	* src/inp.c (get_input_file): Rename mode parameter to file_type, it's all we
	care about here.

	Improve error message when patching a file of different type
	* src/inp.c (get_input_file): Improve error message when patching a file of
	different type.
	* tests/symlinks: Update test case.

	Minor test case updates
	* tests/dash-o-append: Minor update (still expected to fail).
	* tests/symlinks: Minor update.

2012-09-17  Andreas Gruenbacher  <agruen@linbit.com>

	Disable xattrs if libattr doesn't implement attr_copy_action()
	* m4/xattr.m4 (gl_FUNC_XATTR): Only enable USE_XATTR if both attr_copy_file()
	and attr_copy_action() are defined.
	* src/util.c (copy_attr_check): No fallback needed if attr_copy_action() is not
	defined.

	Allow to use potentially dangerous filenames from the root directory
	* src/pch.c (cwd_is_root): New function to check if we are in the root
	directory of a filename.
	(name_is_valid): Allow to use potentially dangerous filenames when the current
	working directory is the root directory: from there, those names are not
	any more dangerous than other names.
	* tests/bad-filenames: New test case.

2012-09-14  Andreas Gruenbacher  <agruen@linbit.com>

	Update leftover license notice in README
	* README: Change leftover GPLv2 license notice to GPLv3.

	Check if libattr implements attr_copy_action()
	* m4/xattr.m4 (gl_FUNC_XATTR): Check if attr_copy_action() is defined.
	* src/util.c: If attr_copy_action() doesn't exist, fall back to the default
	copy_attr_file() behavior of copying most extended attributes except ACLs.

2012-09-13  Andreas Gruenbacher  <agruen@linbit.com>

	Change the type of *_needs_removal from int to bool

	In a git-style diff, make sure not to unlink the original by accident
	* src/patch.c (main): Fail if a file is not empty as expected.
	(output_files): In a git-style diff, make sure not to unlink the original when
	making a backup of an unmodified file.
	* tests/create-delete: Fix failed-file-deletion test and add
	successful-file-deletion test.

	Do not pass file type in mode of open(..., O_CREAT, mode)
	* src/patch.c (main): Strip file type off of create mode for temporary output
	files: some systems don't ignore the file type; we want to create a regular
	file even when patching a symlink.

	Add note on GPLv3 license change in version 2.6
	* NEWS: Add note.

2012-09-12  Andreas Gruenbacher  <agruen@linbit.com>

	Version 2.7
	* NEWS: Update.

	maint: update gnulib submodule

2012-08-11  Andreas Gruenbacher  <agruen@linbit.com>

	Support double-quoted filenames in all context diff formats
	* src/util.c (fetchname): Always recognize double-quoted filenames.
	* src/util.h (fetchname): Update prototype.
	* src/pch.c (intuit_diff_type): Update calls to fetchname().
	* tests/quoted-filenames: Change to a normal unified diff.
	* NEWS: Update.

2012-08-08  Andreas Gruenbacher  <agruen@linbit.com>

	Remove SHA1 hashes from the file id cache
	* src/util.c (file_id): Remove sha1 field.
	(update_sha1, lookup_sha1): Remove functions.
	* src/util.h (update_sha1, lookup_sha1): Remove declarations.

	Detect concatenated git-style patches by tracking what's in the output queue
	* src/patch.c (main): Instead of looking at the SHA hashes to detect
	concatenated git-style patches, detect when a file to write to is already in
	the output queue.
	* tests/concat-git-diff: Add create/delete tests.

	In the file id cache, allow to flag files in the output queue
	* src/util.c (file_id): Add queued_output field.
	(__insert_file_id): Initialize queued_output.
	(set_queued_output, has_queued_output): New functions.
	* src/util.h (set_queued_output, has_queued_output): Declare.

2012-08-08  Dmitry V. Levin  <ldv@altlinux.org>

	Add another git-style diff concatenation regression test
	* tests/concat-git-diff: Add test case here.

2012-08-08  Andreas Gruenbacher  <agruen@linbit.com>

	maint: ignore more build artifacts

2012-08-07  Andreas Gruenbacher  <agruen@linbit.com>

	Change outst variable name to tmpoutst to be less misleading
	* src/patch.c (main): Rename outst to tmpoutst.

2012-08-02  Andreas Gruenbacher  <agruen@linbit.com>

	In git-style diffs, create new files immediatetly and only remember files to modify
	* src/patch.c (output_file): Create new files immediately.  Document why
	things are implemented that way.
	* tests/concat-git-diff: Fix glitch in test case.

2012-08-01  Jim Meyering  <meyering@redhat.com>

	Don't close a negative file descriptor
	* src/inp.c (re_input): Don't close FD if it's negative.

2012-08-01  Andreas Gruenbacher  <agruen@linbit.com>

	Add file create test case which still needs to be fixed
	* tests/concat-git-diff: Add file create test case.

2012-08-01  Jim Meyering  <meyering@redhat.com>

	build: remove unnecessary if-before-free
	* src/util.c (update_sha1): Remove unnecessary if-before-free,
	to avoid "make syntax-check" failure.

	build: mark an internal function as "pure"
	* src/pch.c (sha1_says_nonexistent): Apply _GL_ATTRIBUTE_PURE,
	to avoid failure with -Werror=suggest-attribute=pure.

2012-08-01  Andreas Gruenbacher  <agruen@linbit.com>

	maint: update bootstrap and gnulib submodule
	* bootstrap: Update from gnulib.

	Try to recognize concatenated git diffs and handle them appropriately
	* src/patch.c (main): Remember the "before" SHA1 hashes of git-style patches;
	the same patch will always use the same "before" SHA1 for a specific file.
	Try to recognize concatenated patches based on that.
	* tests/concat-git-diff: New test case.
	* tests/Makefile.am (TESTS): Add new test case.

	Allow to process only part of the deferred output file list
	* src/patch.c (output_files): Add parameter to specify which file to stop at.
	(main): Pass NULL to output_files() to process the entire list.

2012-07-31  Andreas Gruenbacher  <agruen@linbit.com>

	Allow to remember SHA1 hashes in the file id cache
	* src/util.c (file_id): New sha1 field.
	(__insert_file_id): Split off from insert_file_id().  Initialize sha1 field.
	(__lookup_file_id): Split off from lookup_file_id().
	(update_sha1): Remember SHA1 hash of a file or update the remembered SHA1 hash.
	(lookup_sha1): Look up the SHA1 hash of a file.
	* src/util.h (update_sha1, lookup_sha1): Declare.

	Accessor functions for SHA1 hashes in git-style diffs
	* src/pch.c (p_sha1): New variable.
	(get_sha1): New function for saving a sha1 checksum.
	(sha1_says_nonexistent): Take a NULL terminated string instead of an end
	pointer.
	(intuit_diff_type): Remember the SHA1 hashes from index headers in git-style
	diffs in p_sha1.
	(pch_sha1): New function for accessing p_sha1.
	* src/pch.h (pch_sha1): Declare.

	Add missing "diff --git" index lines
	* tests/copy-rename, tests/criss-cross, tests/file-modes,
	tests/mixed-patch-types, tests/quoted-filenames: Add missing index lines in the
	"dif --git" test cases: We will use some of them for consistency checks soon.

2012-04-24  Andreas Gruenbacher  <agruen@linbit.com>

	Fix segfault in output_file_later()
	Bug reported by Dmitry V. Levin <ldv@altlinux.org>.
	* src/patch.c (output_file_later): Fix case where the output file is identical
	with the input file (and to == NULL).

2012-04-17  Andreas Gruenbacher  <agruen@linbit.com>

	maint: update bootstrap and gnulib submodule
	* bootstrap: Update from gnulib.

	Update NEWS
	* NEWS: Update.

	Only warn when trying to modify read-only files
	Failing when trying to patch read-only files causes various users of patch to
	break.  Instead, warn by default and introduce a command line option for
	choosing a different behavior.
	* patch.man: Describe the new behavior and command-line option.
	* src/patch.c (read_only_behavior): New variable.
	(main): Implement the new behavior.
	(longopts): Add the new --read-only option.
	(option_help): Describe the new behavior.
	(get_some_switches): Recognize the new --read-only option.

	Fix "delete file which does not exist" test case
	* tests/create-delete: Remove left-over file f.orig before the test.

	For git-style patch files, do not output files immediately
	In git-style patch files, all patches refer to the initial state of the input
	files; files cannot be modified more than once.  Implement these semantics by
	creating all output files once all patches in the patch file have been
	processed.
	* src/patch.c (init_files_to_output, output_files): Add prototypes.
	(main): Remember which type of patch file we are processing.  Initialize the
	output files list.  Output files of git-style patches once all patches have
	been read, or when from git-style to normal patches.
	(file_to_output): New struct.
	(files_to_output): List of the files to output.
	(output_file, output_file_now, output_file_later): Either queue a file for
	deletion, remember to output a file later (git-style), or output the file
	immediately (normal).
	(dispose_file_to_output, init_files_to_output, output_files,
	 forget_output_files): New functions.
	(gl_list_clear): Should be provided by gnulib but isn't.
	(cleanup): Clean up any left-over temporary output files as well.
	* tests/Makefile-am (XFAIL_TESTS): Remove criss-cross; this test case works now.
	* tests/mixed-patch-types: Patch files that change from normal to git-style, or
	from git-style to normal.

	Export the patch type
	* src/pch.c (p_git_diff): New global variable.
	(intuit_diff_type): Use p_git_diff instead of a local variable.
	(pch_git_diff): New function.

	Remove invalid symlink test case
	* tests/symlinks: Remove test case which deletes and then recreates a symlink:
	all patches in a git-style input file must refer to the "before" state; the
	test case is invalid.

	No longer remember backup files
	Remembering backup files was needed because we would have lost track of deleted
	files before -- but we don't delete files immediately anymore.
	* src/util.c (create_backup_copy): No longer remember backup files.
	(create_backup): Likewise; update comment.
	(move_file): Update create_backup() call.
	* src/util.h (create_backup): Update prototype.
	* src/patch.c (output_file): Update create_backup() call.

	Do not delete files immediately
	Fixes the bug that more than one numbered backup would be created when a patch
	file deletes and recreates a file.
	* bootstrap.conf (gnulib_modules): Add linked-list and xlist modules.
	* src/util.h (file_id_type): Add DELETE_LATER and OVERWRITTEN types.
	(create_backup, set_file_attributes): Update prototype.
	(insert_file_id): Add prototype.
	* src/util.c (insert_file_id): Export.
	(set_file_attributes, create_backup_copy): Make the st argument const.
	(create_backup): Pass in to_st instead of returning it from create_backup().
	This obsoletes the to_errno argument.
	(move_file): Determine to_st here and pass it to create_backup().  Remember
	when a file is overwritten.
	* src/patch.c (output_file): Add to_st parameter.  Remember files to delete
	instead of deleting them immediately.  Pass from-st to create_backup().
	(file_to_delete): New struct.
	(init_files_to_delete, delete_file_later, delete_files): New functions.
	(main): Use init_files_to_delete() and delete_files().  Pass to_st to
	output_file() where we already have it.
	* src/pch.c (intuit_diff_type): Assume that files which are marked for deletion
	don't exist.

	Create and delete output files in a single function
	* src/patch.c (output_file): New function for creating or deleting an output
	file and backing the old file up as needed.
	(main): Use the new function.
	* src/util.c (move_file): Allow FROM_NEEDS_REMOVAL to be NULL.

	Add a type field to entries in the file id cache
	* src/util.h (file_id_type): New enum.
	* src/util.c (file_id): Add a file_id_type field.
	(insert_file_id): Rename from insert_file(); specify a type when inserting a
	file id.
	(lookup_file_id): Rename from file_id_exists(); return a file id type.
	(create_backup_copy, create_backup, move_file): Use insert_file_id() instead of
	insert_file(), and lookup_file_id() instead of file_already_seen().
	* src/patch.c (main): Use lookup_file_id() instead of file_already_seen().

	Switch from the `old' gnu quoting style to the 'new' one
	* src/common.h, src/patch.c, src/pch.c, src/util.c, src/util.h: Switch from the
	`old' gnu quoting style to the 'new' one in messages and comments.

2012-04-06  Andreas Gruenbacher  <agruen@linbit.com>

	Fix use-after-free bug in name_is_valid()
	Reported by Steffen Sledz in
	https://bugzilla.novell.com/show_bug.cgi?id=755136 via Jean Delvare.
	Bug introduced in commit v2.6.1-115-ge0f7075; fixed with help from Jim
	Meyering <meyering@redhat.com>.
	* src/common.h (ARRAY_SIZE): New macro.
	* src/pch.c (invalid_names): New global variable for remembering bad names.
	(intuit_diff_type): Reset invalid_names for each new patch; the names from the
	previous patch have already been freed.
	(name_is_valid): Use invalid_names.  Make the code "safer" and avoid
	duplication.

	Require automake-1.11.2
	* configure.ac (AM_INIT_AUTOMAKE): Require version 1.11.2 which introduced the
	AM_PROG_AR macro, used since commit 297f9e7d.

2012-02-25  Jim Meyering  <meyering@redhat.com>

	build: update gnulib submodule to latest

2012-02-16  Jim Meyering  <meyering@redhat.com>

	build: update bootstrap from gnulib and adapt
	* bootstrap: Update from gnulib.
	* bootstrap.conf (gnulib_tool_option_extras): Define.
	* lib/Makefile.am: Initialize numerous automake variables so that
	generated code in gnulib.mk may use += to append to them.
	* configure.ac: Add AM_PROG_AR, to placate newer automake.

2012-01-01  Jim Meyering  <meyering@redhat.com>

	maint: enable the sc_space_tab syntax-check rule
	* cfg.mk (local-checks-to-skip): Remove sc_space_tab,
	thus enabling this syntax-check rule.
	* tests/quoted-filenames: Use TAB-space, not space-TAB.

	maint: enable the useless_cpp_parens syntax-check rule
	* cfg.mk (local-checks-to-skip): Remove sc_useless_cpp_parens,
	thus enabling this syntax-check rule.
	* src/patch.c: Remove unneeded parentheses.

	maint: update all copyright year number ranges
	Run "make update-copyright".

2011-12-14  Jim Meyering  <meyering@redhat.com>

	build: update to latest gnulib and adapt
	Mark functions as pure of const, per recommendations enabled by
	new gcc -W options.  Apply _GL_ATTRIBUTE_PURE and _GL_ATTRIBUTE_CONST.
	* src/common.h: Apply new function attributes.
	* src/pch.c: Likewise.
	* src/pch.h: Likewise.
	* src/util.c: Likewise.
	* src/util.h: Likewise.
	* configure.ac: Use -Wno-format-nonliteral.
	* m4/.gitignore: Update.
	* gnulib: Update to latest.
	* cfg.mk: Exempt src/util.c from two tests, to avoid new
	"make syntax-check" failures.

2011-12-09  Andreas Gruenbacher  <agruen@linbit.com>

	Timestamp not set when creating files with --set-time or --set-utc
	* src/util.h (enum file_attributes): Add FA_XATTRS flag for extended
	attributes.
	* src/patch.c (main): Use set_file_attributes() even when the infile doesn't
	exist: it may still set the file time (FA_TIMES).  Omit all other FA_ flags if
	infile doesn't exist.  Otherwise, add FA_XATTRS as well.
	* src/util.c (set_file_attributes): Only copy extended attributes if FA_XATTRS
	is set.  Avoid using st where it may be undefined.
	* tests/preserve-mode-and-timestamp: Add file create test.

2011-10-12  Stefano Lattarini  <stefano.lattarini@gmail.com>

	tests: specify test runner in LOG_COMPILER, not in TEST_ENVIRONMENT
	* tests/Makefile.am (TESTS_ENVIRONMENT): Don't use $(SHELL) here
	to ensure the test scripts are run through it; instead, ...
	(LOG_COMPILER): ... use it here.

2011-10-11  Jim Meyering  <meyering@redhat.com>

	give a diagnostic rather than a failed assertion for a mangled patch
	* src/pch.c (another_hunk): Rather than asserting(C), issue the
	"replacement text or line numbers mangled ..." diagnostic when !C.
	* tests/mangled-numbers-abort: New test for the above.
	* tests/Makefile.am (TESTS): Add it.
	* NEWS: Mention it.
	Reported by Gabriel Vlasiu via Tim Waugh.
	See also http://bugzilla.redhat.com/738959

2011-08-11  Jim Meyering  <meyering@redhat.com>

	build: use largefile module and update to latest gnulib
	* configure.ac: Remove AC_SYS_LARGEFILE, subsumed by ...
	* bootstrap.conf (gnulib_modules): ...this.  Use largefile module.
	* gnulib: Update to latest.
	This is useful to Mac OS X 10.5 users if/when configure
	is generated using autoconf prior to v2.68-80-gdb2f2e0.

	build: include .version in tarball to avoid distcheck failure
	* Makefile.am (EXTRA_DIST): Append .version, to avoid "make distcheck"
	failure when run from an unpacked tarball.
	Reported by Iain Nicol.

2011-08-11  Andreas Gruenbacher  <agruen@linbit.com>

	README: Describe where to go from a "git clone"
	* README: Refer users to README-hacking after a "git clone".

2011-05-25  Jim Meyering  <meyering@redhat.com>

	don't call fdopen with a negative FD upon dup failure
	* src/patch.c (open_outfile): If dup fails, don't clobber its
	errno value by calling fdopen with -1.

	plug a leak in inp.c's plan_a
	* src/inp.c (plan_a): Don't leak "buffer" upon early return.

	emit one more diagnostic with the required "program_name: " prefix
	* src/util.c: Include "error.h".
	(ask): Use error, not perror.  The latter would not have included
	the usual "program name: " prefix.

	remove side effect from assert
[--snip--]
