X-Git-Url: https://git.octo.it/?a=blobdiff_plain;f=apply.c;h=50be8f3e22d0906d09410b89ebc8d06f928ba631;hb=942c1f53aef03cb3d8b5c39b38997a379c3fad20;hp=e0a1549022ef4ad027c2dae369615bb4c2aec796;hpb=95bedc9eecfa4d905a9d85dff8b406049476d9e7;p=git.git

diff --git a/apply.c b/apply.c
index e0a15490..50be8f3e 100644
--- a/apply.c
+++ b/apply.c
@@ -5,31 +5,30 @@
  *
  * This applies patches on top of some (arbitrary) version of the SCM.
  *
- * NOTE! It does all its work in the index file, and only cares about
- * the files in the working directory if you tell it to "merge" the
- * patch apply.
- *
- * Even when merging it always takes the source from the index, and
- * uses the working tree as a "branch" for a 3-way merge.
  */
-#include <ctype.h>
-
+#include <fnmatch.h>
 #include "cache.h"
+#include "quote.h"
 
-// We default to the merge behaviour, since that's what most people would
-// expect.
-//
 //  --check turns on checking that the working tree matches the
 //    files that are being modified, but doesn't apply the patch
 //  --stat does just a diffstat, and doesn't actually apply
-//  --show-files shows the directory changes
+//  --numstat does numeric diffstat, and doesn't actually apply
+//  --index-info shows the old and new index info for paths if available.
 //
-static int merge_patch = 1;
+static int allow_binary_replacement = 0;
+static int check_index = 0;
+static int write_index = 0;
 static int diffstat = 0;
+static int numstat = 0;
+static int summary = 0;
 static int check = 0;
 static int apply = 1;
-static int show_files = 0;
-static const char apply_usage[] = "git-apply [--stat] [--check] [--show-files] <patch>";
+static int no_add = 0;
+static int show_index_info = 0;
+static int line_termination = '\n';
+static const char apply_usage[] =
+"git-apply [--stat] [--numstat] [--summary] [--check] [--index] [--apply] [--no-add] [--index-info] [--allow-binary-replacement] [-z] <patch>...";
 
 /*
  * For "diff-stat" like behaviour, we keep track of the biggest change
@@ -56,9 +55,14 @@ struct fragment {
 struct patch {
 	char *new_name, *old_name, *def_name;
 	unsigned int old_mode, new_mode;
-	int is_rename, is_copy, is_new, is_delete;
+	int is_rename, is_copy, is_new, is_delete, is_binary;
 	int lines_added, lines_deleted;
+	int score;
 	struct fragment *fragments;
+	char *result;
+	unsigned long resultsize;
+	char old_sha1_prefix[41];
+	char new_sha1_prefix[41];
 	struct patch *next;
 };
 
@@ -100,7 +104,7 @@ static void *read_patch_file(int fd, unsigned long *sizep)
 	return buffer;
 }
 
-static unsigned long linelen(char *buffer, unsigned long size)
+static unsigned long linelen(const char *buffer, unsigned long size)
 {
 	unsigned long len = 0;
 	while (size--) {
@@ -135,6 +139,35 @@ static char * find_name(const char *line, char *def, int p_value, int terminate)
 	const char *start = line;
 	char *name;
 
+	if (*line == '"') {
+		/* Proposed "new-style" GNU patch/diff format; see
+		 * http://marc.theaimsgroup.com/?l=git&m=112927316408690&w=2
+		 */
+		name = unquote_c_style(line, NULL);
+		if (name) {
+			char *cp = name;
+			while (p_value) {
+				cp = strchr(name, '/');
+				if (!cp)
+					break;
+				cp++;
+				p_value--;
+			}
+			if (cp) {
+				/* name can later be freed, so we need
+				 * to memmove, not just return cp
+				 */
+				memmove(name, cp, strlen(cp) + 1);
+				free(def);
+				return name;
+			}
+			else {
+				free(name);
+				name = NULL;
+			}
+		}
+	}
+
 	for (;;) {
 		char c = *line;
 
@@ -224,37 +257,29 @@ static int gitdiff_hdrend(const char *line, struct patch *patch)
  */
 static char *gitdiff_verify_name(const char *line, int isnull, char *orig_name, const char *oldnew)
 {
-	int len;
-	const char *name;
-
 	if (!orig_name && !isnull)
 		return find_name(line, NULL, 1, 0);
 
-	name = "/dev/null";
-	len = 9;
 	if (orig_name) {
+		int len;
+		const char *name;
+		char *another;
 		name = orig_name;
 		len = strlen(name);
 		if (isnull)
 			die("git-apply: bad git-diff - expected /dev/null, got %s on line %d", name, linenr);
-	}
-
-	if (*name == '/')
-		goto absolute_path;
-
-	for (;;) {
-		char c = *line++;
-		if (c == '\n')
-			break;
-		if (c != '/')
-			continue;
-absolute_path:
-		if (memcmp(line, name, len) || line[len] != '\n')
-			break;
+		another = find_name(line, NULL, 1, 0);
+		if (!another || memcmp(another, name, len))
+			die("git-apply: bad git-diff - inconsistent %s filename on line %d", oldnew, linenr);
+		free(another);
 		return orig_name;
 	}
-	die("git-apply: bad git-diff - inconsistent %s filename on line %d", oldnew, linenr);
-	return NULL;
+	else {
+		/* expect "/dev/null" */
+		if (memcmp("/dev/null", line, 9) || line[9] != '\n')
+			die("git-apply: bad git-diff - expected /dev/null on line %d", linenr);
+		return NULL;
+	}
 }
 
 static int gitdiff_oldname(const char *line, struct patch *patch)
@@ -325,11 +350,47 @@ static int gitdiff_renamedst(const char *line, struct patch *patch)
 
 static int gitdiff_similarity(const char *line, struct patch *patch)
 {
+	if ((patch->score = strtoul(line, NULL, 10)) == ULONG_MAX)
+		patch->score = 0;
 	return 0;
 }
 
 static int gitdiff_dissimilarity(const char *line, struct patch *patch)
 {
+	if ((patch->score = strtoul(line, NULL, 10)) == ULONG_MAX)
+		patch->score = 0;
+	return 0;
+}
+
+static int gitdiff_index(const char *line, struct patch *patch)
+{
+	/* index line is N hexadecimal, "..", N hexadecimal,
+	 * and optional space with octal mode.
+	 */
+	const char *ptr, *eol;
+	int len;
+
+	ptr = strchr(line, '.');
+	if (!ptr || ptr[1] != '.' || 40 < ptr - line)
+		return 0;
+	len = ptr - line;
+	memcpy(patch->old_sha1_prefix, line, len);
+	patch->old_sha1_prefix[len] = 0;
+
+	line = ptr + 2;
+	ptr = strchr(line, ' ');
+	eol = strchr(line, '\n');
+
+	if (!ptr || eol < ptr)
+		ptr = eol;
+	len = ptr - line;
+
+	if (40 < len)
+		return 0;
+	memcpy(patch->new_sha1_prefix, line, len);
+	patch->new_sha1_prefix[len] = 0;
+	if (*ptr == ' ')
+		patch->new_mode = patch->old_mode = strtoul(ptr+1, NULL, 8);
 	return 0;
 }
 
@@ -342,29 +403,124 @@ static int gitdiff_unrecognized(const char *line, struct patch *patch)
 	return -1;
 }
 
-static char *git_header_name(char *line)
+static const char *stop_at_slash(const char *line, int llen)
+{
+	int i;
+
+	for (i = 0; i < llen; i++) {
+		int ch = line[i];
+		if (ch == '/')
+			return line + i;
+	}
+	return NULL;
+}
+
+/* This is to extract the same name that appears on "diff --git"
+ * line.  We do not find and return anything if it is a rename
+ * patch, and it is OK because we will find the name elsewhere.
+ * We need to reliably find name only when it is mode-change only,
+ * creation or deletion of an empty file.  In any of these cases,
+ * both sides are the same name under a/ and b/ respectively.
+ */
+static char *git_header_name(char *line, int llen)
 {
 	int len;
-	char *name, *second;
+	const char *name;
+	const char *second = NULL;
 
-	/*
-	 * Find the first '/'
-	 */
-	name = line;
-	for (;;) {
-		char c = *name++;
-		if (c == '\n')
+	line += strlen("diff --git ");
+	llen -= strlen("diff --git ");
+
+	if (*line == '"') {
+		const char *cp;
+		char *first = unquote_c_style(line, &second);
+		if (!first)
 			return NULL;
-		if (c == '/')
-			break;
+
+		/* advance to the first slash */
+		cp = stop_at_slash(first, strlen(first));
+		if (!cp || cp == first) {
+			/* we do not accept absolute paths */
+		free_first_and_fail:
+			free(first);
+			return NULL;
+		}
+		len = strlen(cp+1);
+		memmove(first, cp+1, len+1); /* including NUL */
+
+		/* second points at one past closing dq of name.
+		 * find the second name.
+		 */
+		while ((second < line + llen) && isspace(*second))
+			second++;
+
+		if (line + llen <= second)
+			goto free_first_and_fail;
+		if (*second == '"') {
+			char *sp = unquote_c_style(second, NULL);
+			if (!sp)
+				goto free_first_and_fail;
+			cp = stop_at_slash(sp, strlen(sp));
+			if (!cp || cp == sp) {
+			free_both_and_fail:
+				free(sp);
+				goto free_first_and_fail;
+			}
+			/* They must match, otherwise ignore */
+			if (strcmp(cp+1, first))
+				goto free_both_and_fail;
+			free(sp);
+			return first;
+		}
+
+		/* unquoted second */
+		cp = stop_at_slash(second, line + llen - second);
+		if (!cp || cp == second)
+			goto free_first_and_fail;
+		cp++;
+		if (line + llen - cp != len + 1 ||
+		    memcmp(first, cp, len))
+			goto free_first_and_fail;
+		return first;
 	}
 
-	/*
-	 * We don't accept absolute paths (/dev/null) as possibly valid
-	 */
-	if (name == line+1)
+	/* unquoted first name */
+	name = stop_at_slash(line, llen);
+	if (!name || name == line)
 		return NULL;
 
+	name++;
+
+	/* since the first name is unquoted, a dq if exists must be
+	 * the beginning of the second name.
+	 */
+	for (second = name; second < line + llen; second++) {
+		if (*second == '"') {
+			const char *cp = second;
+			const char *np;
+			char *sp = unquote_c_style(second, NULL);
+
+			if (!sp)
+				return NULL;
+			np = stop_at_slash(sp, strlen(sp));
+			if (!np || np == sp) {
+			free_second_and_fail:
+				free(sp);
+				return NULL;
+			}
+			np++;
+			len = strlen(np);
+			if (len < cp - name &&
+			    !strncmp(np, name, len) &&
+			    isspace(name[len])) {
+				/* Good */
+				memmove(sp, np, len + 1);
+				return sp;
+			}
+			goto free_second_and_fail;
+		}
+	}
+
 	/*
 	 * Accept a name only if it shows up twice, exactly the same
 	 * form.
@@ -376,7 +532,7 @@ static char *git_header_name(char *line)
 		default:
 			continue;
 		case '\n':
-			break;
+			return NULL;
 		case '\t': case ' ':
 			second = name+len;
 			for (;;) {
@@ -412,7 +568,7 @@ static int parse_git_header(char *line, int len, unsigned int size, struct patch
 	 * or removing or adding empty files), so we get
 	 * the default name from the header.
 	 */
-	patch->def_name = git_header_name(line + strlen("diff --git "));
+	patch->def_name = git_header_name(line, len);
 
 	line += len;
 	size -= len;
@@ -431,10 +587,13 @@ static int parse_git_header(char *line, int len, unsigned int size, struct patch
 			{ "new file mode ", gitdiff_newfile },
 			{ "copy from ", gitdiff_copysrc },
 			{ "copy to ", gitdiff_copydst },
+			{ "rename old ", gitdiff_renamesrc },
+			{ "rename new ", gitdiff_renamedst },
 			{ "rename from ", gitdiff_renamesrc },
 			{ "rename to ", gitdiff_renamedst },
 			{ "similarity index ", gitdiff_similarity },
 			{ "dissimilarity index ", gitdiff_dissimilarity },
+			{ "index ", gitdiff_index },
 			{ "", gitdiff_unrecognized },
 		};
 		int i;
@@ -550,7 +709,7 @@ static int find_header(char *line, unsigned long size, int *hdrsize, struct patc
 			struct fragment dummy;
 			if (parse_fragment_header(line, len, &dummy) < 0)
 				continue;
-			error("patch fragment without header at line %d: %.*s", linenr, len-1, line);
+			error("patch fragment without header at line %d: %.*s", linenr, (int)len-1, line);
 		}
 
 		if (size < len + 6)
@@ -562,10 +721,13 @@ static int find_header(char *line, unsigned long size, int *hdrsize, struct patc
 		 */
 		if (!memcmp("diff --git ", line, 11)) {
 			int git_hdr_len = parse_git_header(line, len, size, patch);
-			if (git_hdr_len < 0)
+			if (git_hdr_len <= len)
 				continue;
-			if (!patch->old_name && !patch->new_name)
-				die("git diff header lacks filename information");
+			if (!patch->old_name && !patch->new_name) {
+				if (!patch->def_name)
+					die("git diff header lacks filename information (line %d)", linenr);
+				patch->old_name = patch->new_name = patch->def_name;
+			}
 			*hdrsize = git_hdr_len;
 			return offset;
 		}
@@ -603,7 +765,7 @@ static int parse_fragment(char *line, unsigned long size, struct patch *patch, s
 {
 	int added, deleted;
 	int len = linelen(line, size), offset;
-	unsigned long pos[4], oldlines, newlines;
+	unsigned long oldlines, newlines;
 
 	offset = parse_fragment_header(line, len, fragment);
 	if (offset < 0)
@@ -611,10 +773,24 @@ static int parse_fragment(char *line, unsigned long size, struct patch *patch, s
 	oldlines = fragment->oldlines;
 	newlines = fragment->newlines;
 
-	if (patch->is_new < 0 && (pos[0] || oldlines))
-		patch->is_new = 0;
-	if (patch->is_delete < 0 && (pos[1] || newlines))
-		patch->is_delete = 0;
+	if (patch->is_new < 0) {
+		patch->is_new =  !oldlines;
+		if (!oldlines)
+			patch->old_name = NULL;
+	}
+	if (patch->is_delete < 0) {
+		patch->is_delete = !newlines;
+		if (!newlines)
+			patch->new_name = NULL;
+	}
+
+	if (patch->is_new != !oldlines)
+		return error("new file depends on old contents");
+	if (patch->is_delete != !newlines) {
+		if (newlines)
+			return error("deleted file still has contents");
+		fprintf(stderr, "** warning: file %s becomes empty but is not deleted\n", patch->new_name);
+	}
 
 	/* Parse the thing.. */
 	line += len;
@@ -642,11 +818,27 @@ static int parse_fragment(char *line, unsigned long size, struct patch *patch, s
 			added++;
 			newlines--;
 			break;
-		/* We allow "\ No newline at end of file" */
+
+                /* We allow "\ No newline at end of file". Depending
+                 * on locale settings when the patch was produced we
+                 * don't know what this line looks like. The only
+                 * thing we do know is that it begins with "\ ".
+		 * Checking for 12 is just for sanity check -- any
+		 * l10n of "\ No newline..." is at least that long.
+		 */
 		case '\\':
+			if (len < 12 || memcmp(line, "\\ ", 2))
+				return -1;
 			break;
 		}
 	}
+	/* If a fragment ends with an incomplete line, we failed to include
+	 * it in the above loop because we hit oldlines == newlines == 0
+	 * before seeing it.
+	 */
+	if (12 < size && !memcmp(line, "\\ ", 2))
+		offset += linelen(line, size);
+
 	patch->lines_added += added;
 	patch->lines_deleted += deleted;
 	return offset;
@@ -680,6 +872,16 @@ static int parse_single_patch(char *line, unsigned long size, struct patch *patc
 	return offset;
 }
 
+static inline int metadata_changes(struct patch *patch)
+{
+	return	patch->is_rename > 0 ||
+		patch->is_copy > 0 ||
+		patch->is_new > 0 ||
+		patch->is_delete ||
+		(patch->old_mode && patch->new_mode &&
+		 patch->old_mode != patch->new_mode);
+}
+
 static int parse_chunk(char *buffer, unsigned long size, struct patch *patch)
 {
 	int hdrsize, patchsize;
@@ -690,19 +892,58 @@ static int parse_chunk(char *buffer, unsigned long size, struct patch *patch)
 
 	patchsize = parse_single_patch(buffer + offset + hdrsize, size - offset - hdrsize, patch);
 
+	if (!patchsize) {
+		static const char *binhdr[] = {
+			"Binary files ",
+			"Files ",
+			NULL,
+		};
+		int i;
+		int hd = hdrsize + offset;
+		unsigned long llen = linelen(buffer + hd, size - hd);
+
+		if (!memcmp(" differ\n", buffer + hd + llen - 8, 8))
+			for (i = 0; binhdr[i]; i++) {
+				int len = strlen(binhdr[i]);
+				if (len < size - hd &&
+				    !memcmp(binhdr[i], buffer + hd, len)) {
+					patch->is_binary = 1;
+					break;
+				}
+			}
+
+		/* Empty patch cannot be applied if:
+		 * - it is a binary patch and we do not do binary_replace, or
+		 * - text patch without metadata change
+		 */
+		if ((apply || check) &&
+		    (patch->is_binary
+		     ? !allow_binary_replacement
+		     : !metadata_changes(patch)))
+			die("patch with only garbage at line %d", linenr);
+	}
+
 	return offset + hdrsize + patchsize;
 }
 
-const char pluses[] = "++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++";
-const char minuses[]= "----------------------------------------------------------------------";
+static const char pluses[] = "++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++";
+static const char minuses[]= "----------------------------------------------------------------------";
 
 static void show_stats(struct patch *patch)
 {
-	char *name = patch->old_name;
+	const char *prefix = "";
+	char *name = patch->new_name;
+	char *qname = NULL;
 	int len, max, add, del, total;
 
 	if (!name)
-		name = patch->new_name;
+		name = patch->old_name;
+
+	if (0 < (len = quote_c_style(name, NULL, NULL, 0))) {
+		qname = xmalloc(len + 1);
+		quote_c_style(name, qname, NULL, 0);
+		name = qname;
+	}
 
 	/*
 	 * "scale" the filename
@@ -711,8 +952,15 @@ static void show_stats(struct patch *patch)
 	max = max_len;
 	if (max > 50)
 		max = 50;
-	if (len > max)
+	if (len > max) {
+		char *slash;
+		prefix = "...";
+		max -= 3;
 		name += len - max;
+		slash = strchr(name, '/');
+		if (slash)
+			name = slash;
+	}
 	len = max;
 
 	/*
@@ -726,12 +974,310 @@ static void show_stats(struct patch *patch)
 	del = patch->lines_deleted;
 	total = add + del;
 
-	total = (total * max + max_change / 2) / max_change;
-	add = (add * max + max_change / 2) / max_change;
-	del = total - add;
-	printf(" %-*s |%5d %.*s%.*s\n",
-		len, name, patch->lines_added + patch->lines_deleted,
-		add, pluses, del, minuses);
+	if (max_change > 0) {
+		total = (total * max + max_change / 2) / max_change;
+		add = (add * max + max_change / 2) / max_change;
+		del = total - add;
+	}
+	if (patch->is_binary)
+		printf(" %s%-*s |  Bin\n", prefix, len, name);
+	else
+		printf(" %s%-*s |%5d %.*s%.*s\n", prefix,
+		       len, name, patch->lines_added + patch->lines_deleted,
+		       add, pluses, del, minuses);
+	if (qname)
+		free(qname);
+}
+
+static int read_old_data(struct stat *st, const char *path, void *buf, unsigned long size)
+{
+	int fd;
+	unsigned long got;
+
+	switch (st->st_mode & S_IFMT) {
+	case S_IFLNK:
+		return readlink(path, buf, size);
+	case S_IFREG:
+		fd = open(path, O_RDONLY);
+		if (fd < 0)
+			return error("unable to open %s", path);
+		got = 0;
+		for (;;) {
+			int ret = read(fd, buf + got, size - got);
+			if (ret < 0) {
+				if (errno == EAGAIN)
+					continue;
+				break;
+			}
+			if (!ret)
+				break;
+			got += ret;
+		}
+		close(fd);
+		return got;
+
+	default:
+		return -1;
+	}
+}
+
+static int find_offset(const char *buf, unsigned long size, const char *fragment, unsigned long fragsize, int line)
+{
+	int i;
+	unsigned long start, backwards, forwards;
+
+	if (fragsize > size)
+		return -1;
+
+	start = 0;
+	if (line > 1) {
+		unsigned long offset = 0;
+		i = line-1;
+		while (offset + fragsize <= size) {
+			if (buf[offset++] == '\n') {
+				start = offset;
+				if (!--i)
+					break;
+			}
+		}
+	}
+
+	/* Exact line number? */
+	if (!memcmp(buf + start, fragment, fragsize))
+		return start;
+
+	/*
+	 * There's probably some smart way to do this, but I'll leave
+	 * that to the smart and beautiful people. I'm simple and stupid.
+	 */
+	backwards = start;
+	forwards = start;
+	for (i = 0; ; i++) {
+		unsigned long try;
+		int n;
+
+		/* "backward" */
+		if (i & 1) {
+			if (!backwards) {
+				if (forwards + fragsize > size)
+					break;
+				continue;
+			}
+			do {
+				--backwards;
+			} while (backwards && buf[backwards-1] != '\n');
+			try = backwards;
+		} else {
+			while (forwards + fragsize <= size) {
+				if (buf[forwards++] == '\n')
+					break;
+			}
+			try = forwards;
+		}
+
+		if (try + fragsize > size)
+			continue;
+		if (memcmp(buf + try, fragment, fragsize))
+			continue;
+		n = (i >> 1)+1;
+		if (i & 1)
+			n = -n;
+		return try;
+	}
+
+	/*
+	 * We should start searching forward and backward.
+	 */
+	return -1;
+}
+
+struct buffer_desc {
+	char *buffer;
+	unsigned long size;
+	unsigned long alloc;
+};
+
+static int apply_one_fragment(struct buffer_desc *desc, struct fragment *frag)
+{
+	char *buf = desc->buffer;
+	const char *patch = frag->patch;
+	int offset, size = frag->size;
+	char *old = xmalloc(size);
+	char *new = xmalloc(size);
+	int oldsize = 0, newsize = 0;
+
+	while (size > 0) {
+		int len = linelen(patch, size);
+		int plen;
+
+		if (!len)
+			break;
+
+		/*
+		 * "plen" is how much of the line we should use for
+		 * the actual patch data. Normally we just remove the
+		 * first character on the line, but if the line is
+		 * followed by "\ No newline", then we also remove the
+		 * last one (which is the newline, of course).
+		 */
+		plen = len-1;
+		if (len < size && patch[len] == '\\')
+			plen--;
+		switch (*patch) {
+		case ' ':
+		case '-':
+			memcpy(old + oldsize, patch + 1, plen);
+			oldsize += plen;
+			if (*patch == '-')
+				break;
+		/* Fall-through for ' ' */
+		case '+':
+			if (*patch != '+' || !no_add) {
+				memcpy(new + newsize, patch + 1, plen);
+				newsize += plen;
+			}
+			break;
+		case '@': case '\\':
+			/* Ignore it, we already handled it */
+			break;
+		default:
+			return -1;
+		}
+		patch += len;
+		size -= len;
+	}
+
+	offset = find_offset(buf, desc->size, old, oldsize, frag->newpos);
+	if (offset >= 0) {
+		int diff = newsize - oldsize;
+		unsigned long size = desc->size + diff;
+		unsigned long alloc = desc->alloc;
+
+		if (size > alloc) {
+			alloc = size + 8192;
+			desc->alloc = alloc;
+			buf = xrealloc(buf, alloc);
+			desc->buffer = buf;
+		}
+		desc->size = size;
+		memmove(buf + offset + newsize, buf + offset + oldsize, size - offset - newsize);
+		memcpy(buf + offset, new, newsize);
+		offset = 0;
+	}
+
+	free(old);
+	free(new);
+	return offset;
+}
+
+static int apply_fragments(struct buffer_desc *desc, struct patch *patch)
+{
+	struct fragment *frag = patch->fragments;
+	const char *name = patch->old_name ? patch->old_name : patch->new_name;
+
+	if (patch->is_binary) {
+		unsigned char sha1[20];
+
+		if (!allow_binary_replacement)
+			return error("cannot apply binary patch to '%s' "
+				     "without --allow-binary-replacement",
+				     name);
+
+		/* For safety, we require patch index line to contain
+		 * full 40-byte textual SHA1 for old and new, at least for now.
+		 */
+		if (strlen(patch->old_sha1_prefix) != 40 ||
+		    strlen(patch->new_sha1_prefix) != 40 ||
+		    get_sha1_hex(patch->old_sha1_prefix, sha1) ||
+		    get_sha1_hex(patch->new_sha1_prefix, sha1))
+			return error("cannot apply binary patch to '%s' "
+				     "without full index line", name);
+
+		if (patch->old_name) {
+			unsigned char hdr[50];
+			int hdrlen;
+
+			/* See if the old one matches what the patch
+			 * applies to.
+			 */
+			write_sha1_file_prepare(desc->buffer, desc->size,
+						"blob", sha1, hdr, &hdrlen);
+			if (strcmp(sha1_to_hex(sha1), patch->old_sha1_prefix))
+				return error("the patch applies to '%s' (%s), "
+					     "which does not match the "
+					     "current contents.",
+					     name, sha1_to_hex(sha1));
+		}
+		else {
+			/* Otherwise, the old one must be empty. */
+			if (desc->size)
+				return error("the patch applies to an empty "
+					     "'%s' but it is not empty", name);
+		}
+
+		/* For now, we do not record post-image data in the patch,
+		 * and require the object already present in the recipient's
+		 * object database.
+		 */
+		if (desc->buffer) {
+			free(desc->buffer);
+			desc->alloc = desc->size = 0;
+		}
+		get_sha1_hex(patch->new_sha1_prefix, sha1);
+
+		if (memcmp(sha1, null_sha1, 20)) {
+			char type[10];
+			unsigned long size;
+
+			desc->buffer = read_sha1_file(sha1, type, &size);
+			if (!desc->buffer)
+				return error("the necessary postimage %s for "
+					     "'%s' does not exist",
+					     patch->new_sha1_prefix, name);
+			desc->alloc = desc->size = size;
+		}
+
+		return 0;
+	}
+
+	while (frag) {
+		if (apply_one_fragment(desc, frag) < 0)
+			return error("patch failed: %s:%ld",
+				     name, frag->oldpos);
+		frag = frag->next;
+	}
+	return 0;
+}
+
+static int apply_data(struct patch *patch, struct stat *st)
+{
+	char *buf;
+	unsigned long size, alloc;
+	struct buffer_desc desc;
+
+	size = 0;
+	alloc = 0;
+	buf = NULL;
+	if (patch->old_name) {
+		size = st->st_size;
+		alloc = size + 8192;
+		buf = xmalloc(alloc);
+		if (read_old_data(st, patch->old_name, buf, alloc) != size)
+			return error("read of %s failed", patch->old_name);
+	}
+
+	desc.size = size;
+	desc.alloc = alloc;
+	desc.buffer = buf;
+	if (apply_fragments(&desc, patch) < 0)
+		return -1;
+	patch->result = desc.buffer;
+	patch->resultsize = desc.size;
+
+	if (patch->is_delete && patch->resultsize)
+		return error("removal patch leaves file contents");
+
+	return 0;
 }
 
 static int check_patch(struct patch *patch)
@@ -739,32 +1285,82 @@ static int check_patch(struct patch *patch)
 	struct stat st;
 	const char *old_name = patch->old_name;
 	const char *new_name = patch->new_name;
+	const char *name = old_name ? old_name : new_name;
 
 	if (old_name) {
-		int pos = cache_name_pos(old_name, strlen(old_name));
 		int changed;
+		int stat_ret = lstat(old_name, &st);
+
+		if (check_index) {
+			int pos = cache_name_pos(old_name, strlen(old_name));
+			if (pos < 0)
+				return error("%s: does not exist in index",
+					     old_name);
+			if (stat_ret < 0) {
+				struct checkout costate;
+				if (errno != ENOENT)
+					return error("%s: %s", old_name,
+						     strerror(errno));
+				/* checkout */
+				costate.base_dir = "";
+				costate.base_dir_len = 0;
+				costate.force = 0;
+				costate.quiet = 0;
+				costate.not_new = 0;
+				costate.refresh_cache = 1;
+				if (checkout_entry(active_cache[pos],
+						   &costate) ||
+				    lstat(old_name, &st))
+					return -1;
+			}
+
+			changed = ce_match_stat(active_cache[pos], &st);
+			if (changed)
+				return error("%s: does not match index",
+					     old_name);
+		}
+		else if (stat_ret < 0)
+			return error("%s: %s", old_name, strerror(errno));
 
-		if (pos < 0)
-			return error("%s: does not exist in index", old_name);
 		if (patch->is_new < 0)
 			patch->is_new = 0;
-		if (lstat(old_name, &st) < 0)
-			return error("%s: %s\n", strerror(errno));
-		changed = ce_match_stat(active_cache[pos], &st);
-		if (changed)
-			return error("%s: does not match index", old_name);
+		st.st_mode = ntohl(create_ce_mode(st.st_mode));
 		if (!patch->old_mode)
 			patch->old_mode = st.st_mode;
+		if ((st.st_mode ^ patch->old_mode) & S_IFMT)
+			return error("%s: wrong type", old_name);
+		if (st.st_mode != patch->old_mode)
+			fprintf(stderr, "warning: %s has type %o, expected %o\n",
+				old_name, st.st_mode, patch->old_mode);
 	}
 
 	if (new_name && (patch->is_new | patch->is_rename | patch->is_copy)) {
-		if (cache_name_pos(new_name, strlen(new_name)) >= 0)
+		if (check_index && cache_name_pos(new_name, strlen(new_name)) >= 0)
 			return error("%s: already exists in index", new_name);
 		if (!lstat(new_name, &st))
 			return error("%s: already exists in working directory", new_name);
 		if (errno != ENOENT)
 			return error("%s: %s", new_name, strerror(errno));
+		if (!patch->new_mode) {
+			if (patch->is_new)
+				patch->new_mode = S_IFREG | 0644;
+			else
+				patch->new_mode = patch->old_mode;
+		}
 	}
+
+	if (new_name && old_name) {
+		int same = !strcmp(old_name, new_name);
+		if (!patch->new_mode)
+			patch->new_mode = patch->old_mode;
+		if ((patch->old_mode ^ patch->new_mode) & S_IFMT)
+			return error("new mode (%o) of %s does not match old mode (%o)%s%s",
+				patch->new_mode, new_name, patch->old_mode,
+				same ? "" : " of ", same ? "" : old_name);
+	}	
+
+	if (apply_data(patch, &st) < 0)
+		return error("%s: patch does not apply", name);
 	return 0;
 }
 
@@ -777,32 +1373,38 @@ static int check_patch_list(struct patch *patch)
 	return error;
 }
 
-static void show_file(int c, unsigned int mode, const char *name)
+static inline int is_null_sha1(const unsigned char *sha1)
 {
-	printf("%c %o %s\n", c, mode, name);
+	return !memcmp(sha1, null_sha1, 20);
 }
 
-static void show_file_list(struct patch *patch)
+static void show_index_list(struct patch *list)
 {
-	for (;patch ; patch = patch->next) {
-		if (patch->is_rename) {
-			show_file('-', patch->old_mode, patch->old_name);
-			show_file('+', patch->new_mode, patch->new_name);
-			continue;
-		}
-		if (patch->is_copy || patch->is_new) {
-			show_file('+', patch->new_mode, patch->new_name);
-			continue;
-		}
-		if (patch->is_delete) {
-			show_file('-', patch->old_mode, patch->old_name);
-			continue;
-		}
-		if (patch->old_mode && patch->new_mode && patch->old_mode != patch->new_mode) {
-			printf("M %o:%o %s\n", patch->old_mode, patch->new_mode, patch->old_name);
-			continue;
-		}
-		printf("M %o %s\n", patch->old_mode, patch->old_name);
+	struct patch *patch;
+
+	/* Once we start supporting the reverse patch, it may be
+	 * worth showing the new sha1 prefix, but until then...
+	 */
+	for (patch = list; patch; patch = patch->next) {
+		const unsigned char *sha1_ptr;
+		unsigned char sha1[20];
+		const char *name;
+
+		name = patch->old_name ? patch->old_name : patch->new_name;
+		if (patch->is_new)
+			sha1_ptr = null_sha1;
+		else if (get_sha1(patch->old_sha1_prefix, sha1))
+			die("sha1 information is lacking or useless (%s).",
+			    name);
+		else
+			sha1_ptr = sha1;
+
+		printf("%06o %s	",patch->old_mode, sha1_to_hex(sha1_ptr));
+		if (line_termination && quote_c_style(name, NULL, NULL, 0))
+			quote_c_style(name, NULL, stdout, 0);
+		else
+			fputs(name, stdout);
+		putchar(line_termination);
 	}
 }
 
@@ -820,6 +1422,98 @@ static void stat_patch_list(struct patch *patch)
 	printf(" %d files changed, %d insertions(+), %d deletions(-)\n", files, adds, dels);
 }
 
+static void numstat_patch_list(struct patch *patch)
+{
+	for ( ; patch; patch = patch->next) {
+		const char *name;
+		name = patch->old_name ? patch->old_name : patch->new_name;
+		printf("%d\t%d\t", patch->lines_added, patch->lines_deleted);
+		if (line_termination && quote_c_style(name, NULL, NULL, 0))
+			quote_c_style(name, NULL, stdout, 0);
+		else
+			fputs(name, stdout);
+		putchar('\n');
+	}
+}
+
+static void show_file_mode_name(const char *newdelete, unsigned int mode, const char *name)
+{
+	if (mode)
+		printf(" %s mode %06o %s\n", newdelete, mode, name);
+	else
+		printf(" %s %s\n", newdelete, name);
+}
+
+static void show_mode_change(struct patch *p, int show_name)
+{
+	if (p->old_mode && p->new_mode && p->old_mode != p->new_mode) {
+		if (show_name)
+			printf(" mode change %06o => %06o %s\n",
+			       p->old_mode, p->new_mode, p->new_name);
+		else
+			printf(" mode change %06o => %06o\n",
+			       p->old_mode, p->new_mode);
+	}
+}
+
+static void show_rename_copy(struct patch *p)
+{
+	const char *renamecopy = p->is_rename ? "rename" : "copy";
+	const char *old, *new;
+
+	/* Find common prefix */
+	old = p->old_name;
+	new = p->new_name;
+	while (1) {
+		const char *slash_old, *slash_new;
+		slash_old = strchr(old, '/');
+		slash_new = strchr(new, '/');
+		if (!slash_old ||
+		    !slash_new ||
+		    slash_old - old != slash_new - new ||
+		    memcmp(old, new, slash_new - new))
+			break;
+		old = slash_old + 1;
+		new = slash_new + 1;
+	}
+	/* p->old_name thru old is the common prefix, and old and new
+	 * through the end of names are renames
+	 */
+	if (old != p->old_name)
+		printf(" %s %.*s{%s => %s} (%d%%)\n", renamecopy,
+		       (int)(old - p->old_name), p->old_name,
+		       old, new, p->score);
+	else
+		printf(" %s %s => %s (%d%%)\n", renamecopy,
+		       p->old_name, p->new_name, p->score);
+	show_mode_change(p, 0);
+}
+
+static void summary_patch_list(struct patch *patch)
+{
+	struct patch *p;
+
+	for (p = patch; p; p = p->next) {
+		if (p->is_new)
+			show_file_mode_name("create", p->new_mode, p->new_name);
+		else if (p->is_delete)
+			show_file_mode_name("delete", p->old_mode, p->old_name);
+		else {
+			if (p->is_rename || p->is_copy)
+				show_rename_copy(p);
+			else {
+				if (p->score) {
+					printf(" rewrite %s (%d%%)\n",
+					       p->new_name, p->score);
+					show_mode_change(p, 0);
+				}
+				else
+					show_mode_change(p, 1);
+			}
+		}
+	}
+}
+
 static void patch_stats(struct patch *patch)
 {
 	int lines = patch->lines_added + patch->lines_deleted;
@@ -827,22 +1521,201 @@ static void patch_stats(struct patch *patch)
 	if (lines > max_change)
 		max_change = lines;
 	if (patch->old_name) {
-		int len = strlen(patch->old_name);
+		int len = quote_c_style(patch->old_name, NULL, NULL, 0);
+		if (!len)
+			len = strlen(patch->old_name);
 		if (len > max_len)
 			max_len = len;
 	}
 	if (patch->new_name) {
-		int len = strlen(patch->new_name);
+		int len = quote_c_style(patch->new_name, NULL, NULL, 0);
+		if (!len)
+			len = strlen(patch->new_name);
 		if (len > max_len)
 			max_len = len;
 	}
 }
 
+static void remove_file(struct patch *patch)
+{
+	if (write_index) {
+		if (remove_file_from_cache(patch->old_name) < 0)
+			die("unable to remove %s from index", patch->old_name);
+	}
+	unlink(patch->old_name);
+}
+
+static void add_index_file(const char *path, unsigned mode, void *buf, unsigned long size)
+{
+	struct stat st;
+	struct cache_entry *ce;
+	int namelen = strlen(path);
+	unsigned ce_size = cache_entry_size(namelen);
+
+	if (!write_index)
+		return;
+
+	ce = xmalloc(ce_size);
+	memset(ce, 0, ce_size);
+	memcpy(ce->name, path, namelen);
+	ce->ce_mode = create_ce_mode(mode);
+	ce->ce_flags = htons(namelen);
+	if (lstat(path, &st) < 0)
+		die("unable to stat newly created file %s", path);
+	fill_stat_cache_info(ce, &st);
+	if (write_sha1_file(buf, size, "blob", ce->sha1) < 0)
+		die("unable to create backing store for newly created file %s", path);
+	if (add_cache_entry(ce, ADD_CACHE_OK_TO_ADD) < 0)
+		die("unable to add cache entry for %s", path);
+}
+
+static void create_subdirectories(const char *path)
+{
+	int len = strlen(path);
+	char *buf = xmalloc(len + 1);
+	const char *slash = path;
+
+	while ((slash = strchr(slash+1, '/')) != NULL) {
+		len = slash - path;
+		memcpy(buf, path, len);
+		buf[len] = 0;
+		if (mkdir(buf, 0777) < 0) {
+			if (errno != EEXIST)
+				break;
+		}
+	}
+	free(buf);
+}
+
+static int try_create_file(const char *path, unsigned int mode, const char *buf, unsigned long size)
+{
+	int fd;
+
+	if (S_ISLNK(mode))
+		return symlink(buf, path);
+	fd = open(path, O_CREAT | O_EXCL | O_WRONLY | O_TRUNC, (mode & 0100) ? 0777 : 0666);
+	if (fd < 0)
+		return -1;
+	while (size) {
+		int written = write(fd, buf, size);
+		if (written < 0) {
+			if (errno == EINTR || errno == EAGAIN)
+				continue;
+			die("writing file %s: %s", path, strerror(errno));
+		}
+		if (!written)
+			die("out of space writing file %s", path);
+		buf += written;
+		size -= written;
+	}
+	if (close(fd) < 0)
+		die("closing file %s: %s", path, strerror(errno));
+	return 0;
+}
+
+/*
+ * We optimistically assume that the directories exist,
+ * which is true 99% of the time anyway. If they don't,
+ * we create them and try again.
+ */
+static void create_one_file(const char *path, unsigned mode, const char *buf, unsigned long size)
+{
+	if (!try_create_file(path, mode, buf, size))
+		return;
+
+	if (errno == ENOENT) {
+		create_subdirectories(path);
+		if (!try_create_file(path, mode, buf, size))
+			return;
+	}
+
+	if (errno == EEXIST) {
+		unsigned int nr = getpid();
+
+		for (;;) {
+			const char *newpath;
+			newpath = mkpath("%s~%u", path, nr);
+			if (!try_create_file(newpath, mode, buf, size)) {
+				if (!rename(newpath, path))
+					return;
+				unlink(newpath);
+				break;
+			}
+			if (errno != EEXIST)
+				break;
+		}			
+	}
+	die("unable to write file %s mode %o", path, mode);
+}
+
+static void create_file(struct patch *patch)
+{
+	const char *path = patch->new_name;
+	unsigned mode = patch->new_mode;
+	unsigned long size = patch->resultsize;
+	char *buf = patch->result;
+
+	if (!mode)
+		mode = S_IFREG | 0644;
+	create_one_file(path, mode, buf, size);	
+	add_index_file(path, mode, buf, size);
+}
+
+static void write_out_one_result(struct patch *patch)
+{
+	if (patch->is_delete > 0) {
+		remove_file(patch);
+		return;
+	}
+	if (patch->is_new > 0 || patch->is_copy) {
+		create_file(patch);
+		return;
+	}
+	/*
+	 * Rename or modification boils down to the same
+	 * thing: remove the old, write the new
+	 */
+	remove_file(patch);
+	create_file(patch);
+}
+
+static void write_out_results(struct patch *list, int skipped_patch)
+{
+	if (!list && !skipped_patch)
+		die("No changes");
+
+	while (list) {
+		write_out_one_result(list);
+		list = list->next;
+	}
+}
+
+static struct cache_file cache_file;
+
+static struct excludes {
+	struct excludes *next;
+	const char *path;
+} *excludes;
+
+static int use_patch(struct patch *p)
+{
+	const char *pathname = p->new_name ? p->new_name : p->old_name;
+	struct excludes *x = excludes;
+	while (x) {
+		if (fnmatch(x->path, pathname, 0) == 0)
+			return 0;
+		x = x->next;
+	}
+	return 1;
+}
+
 static int apply_patch(int fd)
 {
+	int newfd;
 	unsigned long offset, size;
 	char *buffer = read_patch_file(fd, &size);
 	struct patch *list = NULL, **listp = &list;
+	int skipped_patch = 0;
 
 	if (!buffer)
 		return -1;
@@ -856,22 +1729,52 @@ static int apply_patch(int fd)
 		nr = parse_chunk(buffer + offset, size, patch);
 		if (nr < 0)
 			break;
-		patch_stats(patch);
-		*listp = patch;
-		listp = &patch->next;
+		if (use_patch(patch)) {
+			patch_stats(patch);
+			*listp = patch;
+			listp = &patch->next;
+		} else {
+			/* perhaps free it a bit better? */
+			free(patch);
+			skipped_patch++;
+		}
 		offset += nr;
 		size -= nr;
 	}
 
+	newfd = -1;
+	write_index = check_index && apply;
+	if (write_index)
+		newfd = hold_index_file_for_update(&cache_file, get_index_file());
+	if (check_index) {
+		if (read_cache() < 0)
+			die("unable to read index file");
+	}
+
 	if ((check || apply) && check_patch_list(list) < 0)
 		exit(1);
 
-	if (show_files)
-		show_file_list(list);
+	if (apply)
+		write_out_results(list, skipped_patch);
+
+	if (write_index) {
+		if (write_cache(newfd, active_cache, active_nr) ||
+		    commit_index_file(&cache_file))
+			die("Unable to write new cachefile");
+	}
+
+	if (show_index_info)
+		show_index_list(list);
 
 	if (diffstat)
 		stat_patch_list(list);
 
+	if (numstat)
+		numstat_patch_list(list);
+
+	if (summary)
+		summary_patch_list(list);
+
 	free(buffer);
 	return 0;
 }
@@ -881,9 +1784,6 @@ int main(int argc, char **argv)
 	int i;
 	int read_stdin = 1;
 
-	if (read_cache() < 0)
-		die("unable to read index file");
-
 	for (i = 1; i < argc; i++) {
 		const char *arg = argv[i];
 		int fd;
@@ -893,8 +1793,15 @@ int main(int argc, char **argv)
 			read_stdin = 0;
 			continue;
 		}
-		if (!strcmp(arg, "--no-merge")) {
-			merge_patch = 0;
+		if (!strncmp(arg, "--exclude=", 10)) {
+			struct excludes *x = xmalloc(sizeof(*x));
+			x->path = arg + 10;
+			x->next = excludes;
+			excludes = x;
+			continue;
+		}
+		if (!strcmp(arg, "--no-add")) {
+			no_add = 1;
 			continue;
 		}
 		if (!strcmp(arg, "--stat")) {
@@ -902,13 +1809,40 @@ int main(int argc, char **argv)
 			diffstat = 1;
 			continue;
 		}
+		if (!strcmp(arg, "--allow-binary-replacement")) {
+			allow_binary_replacement = 1;
+			continue;
+		}
+		if (!strcmp(arg, "--numstat")) {
+			apply = 0;
+			numstat = 1;
+			continue;
+		}
+		if (!strcmp(arg, "--summary")) {
+			apply = 0;
+			summary = 1;
+			continue;
+		}
 		if (!strcmp(arg, "--check")) {
 			apply = 0;
 			check = 1;
 			continue;
 		}
-		if (!strcmp(arg, "--show-files")) {
-			show_files = 1;
+		if (!strcmp(arg, "--index")) {
+			check_index = 1;
+			continue;
+		}
+		if (!strcmp(arg, "--apply")) {
+			apply = 1;
+			continue;
+		}
+		if (!strcmp(arg, "--index-info")) {
+			apply = 0;
+			show_index_info = 1;
+			continue;
+		}
+		if (!strcmp(arg, "-z")) {
+			line_termination = 0;
 			continue;
 		}
 		fd = open(arg, O_RDONLY);