X-Git-Url: https://git.octo.it/?a=blobdiff_plain;f=apply.c;h=155fbe84da8b6d8dfb231fe508b68a36d52ffc60;hb=d402d5566fdf226697a386dfb9858e5d954e9b91;hp=964df2db10c22d6ed0b89532e0af8cf9a43e607c;hpb=c1067050ce58b5b39f528fe634732da858664603;p=git.git

diff --git a/apply.c b/apply.c
index 964df2db..155fbe84 100644
--- a/apply.c
+++ b/apply.c
@@ -5,26 +5,17 @@
  *
  * 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"
 
-// 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
+//  --show-index-info shows the old and new index info for paths if available.
 //
-static int merge_patch = 1;
 static int check_index = 0;
 static int write_index = 0;
 static int diffstat = 0;
@@ -32,8 +23,9 @@ static int summary = 0;
 static int check = 0;
 static int apply = 1;
 static int show_files = 0;
+static int show_index_info = 0;
 static const char apply_usage[] =
-"git-apply [--no-merge] [--stat] [--summary] [--check] [--index] [--apply] [--show-files] <patch>...";
+"git-apply [--stat] [--summary] [--check] [--index] [--apply] [--show-files] [--show-index-info] <patch>...";
 
 /*
  * For "diff-stat" like behaviour, we keep track of the biggest change
@@ -66,6 +58,8 @@ struct patch {
 	struct fragment *fragments;
 	char *result;
 	unsigned long resultsize;
+	char old_sha1_prefix[41];
+	char new_sha1_prefix[41];
 	struct patch *next;
 };
 
@@ -344,6 +338,38 @@ static int gitdiff_dissimilarity(const char *line, struct patch *patch)
 	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;
+}
+
 /*
  * This is normal for a diff that doesn't change anything: we'll fall through
  * into the next diff. Tell the parser to break out.
@@ -448,6 +474,7 @@ static int parse_git_header(char *line, int len, unsigned int size, struct patch
 			{ "rename to ", gitdiff_renamedst },
 			{ "similarity index ", gitdiff_similarity },
 			{ "dissimilarity index ", gitdiff_dissimilarity },
+			{ "index ", gitdiff_index },
 			{ "", gitdiff_unrecognized },
 		};
 		int i;
@@ -676,7 +703,10 @@ static int parse_fragment(char *line, unsigned long size, struct patch *patch, s
                 /* 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 "\ ". */
+                 * 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;
@@ -723,6 +753,16 @@ 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;
@@ -733,6 +773,9 @@ 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 && !metadata_changes(patch))
+		die("patch with only garbage at line %d", linenr);
+
 	return offset + hdrsize + patchsize;
 }
 
@@ -1017,17 +1060,39 @@ static int check_patch(struct patch *patch)
 
 	if (old_name) {
 		int changed;
+		int stat_ret = lstat(old_name, &st);
 
-		if (lstat(old_name, &st) < 0)
-			return error("%s: %s", old_name, strerror(errno));
 		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);
+				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);
+				return error("%s: does not match index",
+					     old_name);
 		}
+		else if (stat_ret < 0)
+			return error("%s: %s", old_name, strerror(errno));
+
 		if (patch->is_new < 0)
 			patch->is_new = 0;
 		st.st_mode = ntohl(create_ce_mode(st.st_mode));
@@ -1108,6 +1173,36 @@ static void show_file_list(struct patch *patch)
 	}
 }
 
+static inline int is_null_sha1(const unsigned char *sha1)
+{
+	return !memcmp(sha1, null_sha1, 20);
+}
+
+static void show_index_list(struct patch *list)
+{
+	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	%s\n",patch->old_mode,
+		       sha1_to_hex(sha1_ptr), name);
+	}
+}
+
 static void stat_patch_list(struct patch *patch)
 {
 	int files, adds, dels;
@@ -1448,6 +1543,9 @@ static int apply_patch(int fd)
 	if (show_files)
 		show_file_list(list);
 
+	if (show_index_info)
+		show_index_list(list);
+
 	if (diffstat)
 		stat_patch_list(list);
 
@@ -1479,11 +1577,6 @@ int main(int argc, char **argv)
 			excludes = x;
 			continue;
 		}
-		/* NEEDSWORK: this does not do anything at this moment. */
-		if (!strcmp(arg, "--no-merge")) {
-			merge_patch = 0;
-			continue;
-		}
 		if (!strcmp(arg, "--stat")) {
 			apply = 0;
 			diffstat = 1;
@@ -1511,6 +1604,11 @@ int main(int argc, char **argv)
 			show_files = 1;
 			continue;
 		}
+		if (!strcmp(arg, "--show-index-info")) {
+			apply = 0;
+			show_index_info = 1;
+			continue;
+		}
 		fd = open(arg, O_RDONLY);
 		if (fd < 0)
 			usage(apply_usage);