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051308f6e9
This adds "binary patch" to the diff output and teaches apply what to do with them. On the diff generation side, traditionally, we said "Binary files differ\n" without giving anything other than the preimage and postimage object name on the index line. This was good enough for applying a patch generated from your own repository (very useful while rebasing), because the postimage would be available in such a case. However, this was not useful when the recipient of such a patch via e-mail were to apply it, even if the preimage was available. This patch allows the diff to generate "binary" patch when operating under --full-index option. The binary patch follows the usual extended git diff headers, and looks like this: "GIT binary patch\n" <length byte><data>"\n" ... "\n" Each line is prefixed with a "length-byte", whose value is upper or lowercase alphabet that encodes number of bytes that the data on the line decodes to (1..52 -- 'A' means 1, 'B' means 2, ..., 'Z' means 26, 'a' means 27, ...). <data> is 1 or more groups of 5-byte sequence, each of which encodes up to 4 bytes in base85 encoding. Because 52 / 4 * 5 = 65 and we have the length byte, an output line is capped to 66 characters. The payload is the same diff-delta as we use in the packfiles. On the consumption side, git-apply now can decode and apply the binary patch when --allow-binary-replacement is given, the diff was generated with --full-index, and the receiving repository has the preimage blob, which is the same condition as it always required when accepting an "Binary files differ\n" patch. Signed-off-by: Junio C Hamano <junkio@cox.net>
2202 lines
52 KiB
C
2202 lines
52 KiB
C
/*
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* apply.c
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*
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* Copyright (C) Linus Torvalds, 2005
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*
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* This applies patches on top of some (arbitrary) version of the SCM.
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*
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*/
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#include <fnmatch.h>
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#include "cache.h"
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#include "quote.h"
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#include "blob.h"
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#include "delta.h"
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// --check turns on checking that the working tree matches the
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// files that are being modified, but doesn't apply the patch
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// --stat does just a diffstat, and doesn't actually apply
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// --numstat does numeric diffstat, and doesn't actually apply
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// --index-info shows the old and new index info for paths if available.
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//
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static const char *prefix;
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static int prefix_length = -1;
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static int p_value = 1;
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static int allow_binary_replacement = 0;
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static int check_index = 0;
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static int write_index = 0;
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static int diffstat = 0;
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static int numstat = 0;
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static int summary = 0;
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static int check = 0;
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static int apply = 1;
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static int no_add = 0;
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static int show_index_info = 0;
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static int line_termination = '\n';
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static unsigned long p_context = -1;
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static const char apply_usage[] =
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"git-apply [--stat] [--numstat] [--summary] [--check] [--index] [--apply] [--no-add] [--index-info] [--allow-binary-replacement] [-z] [-pNUM] [-CNUM] [--whitespace=<nowarn|warn|error|error-all|strip>] <patch>...";
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static enum whitespace_eol {
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nowarn_whitespace,
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warn_on_whitespace,
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error_on_whitespace,
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strip_whitespace,
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} new_whitespace = warn_on_whitespace;
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static int whitespace_error = 0;
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static int squelch_whitespace_errors = 5;
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static int applied_after_stripping = 0;
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static const char *patch_input_file = NULL;
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static void parse_whitespace_option(const char *option)
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{
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if (!option) {
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new_whitespace = warn_on_whitespace;
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return;
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}
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if (!strcmp(option, "warn")) {
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new_whitespace = warn_on_whitespace;
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return;
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}
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if (!strcmp(option, "nowarn")) {
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new_whitespace = nowarn_whitespace;
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return;
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}
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if (!strcmp(option, "error")) {
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new_whitespace = error_on_whitespace;
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return;
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}
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if (!strcmp(option, "error-all")) {
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new_whitespace = error_on_whitespace;
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squelch_whitespace_errors = 0;
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return;
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}
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if (!strcmp(option, "strip")) {
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new_whitespace = strip_whitespace;
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return;
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}
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die("unrecognized whitespace option '%s'", option);
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}
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static void set_default_whitespace_mode(const char *whitespace_option)
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{
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if (!whitespace_option && !apply_default_whitespace) {
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new_whitespace = (apply
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? warn_on_whitespace
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: nowarn_whitespace);
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}
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}
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/*
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* For "diff-stat" like behaviour, we keep track of the biggest change
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* we've seen, and the longest filename. That allows us to do simple
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* scaling.
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*/
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static int max_change, max_len;
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/*
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* Various "current state", notably line numbers and what
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* file (and how) we're patching right now.. The "is_xxxx"
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* things are flags, where -1 means "don't know yet".
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*/
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static int linenr = 1;
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struct fragment {
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unsigned long leading, trailing;
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unsigned long oldpos, oldlines;
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unsigned long newpos, newlines;
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const char *patch;
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int size;
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struct fragment *next;
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};
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struct patch {
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char *new_name, *old_name, *def_name;
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unsigned int old_mode, new_mode;
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int is_rename, is_copy, is_new, is_delete, is_binary;
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int lines_added, lines_deleted;
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int score;
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struct fragment *fragments;
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char *result;
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unsigned long resultsize;
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char old_sha1_prefix[41];
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char new_sha1_prefix[41];
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struct patch *next;
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};
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#define CHUNKSIZE (8192)
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#define SLOP (16)
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static void *read_patch_file(int fd, unsigned long *sizep)
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{
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unsigned long size = 0, alloc = CHUNKSIZE;
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void *buffer = xmalloc(alloc);
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for (;;) {
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int nr = alloc - size;
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if (nr < 1024) {
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alloc += CHUNKSIZE;
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buffer = xrealloc(buffer, alloc);
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nr = alloc - size;
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}
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nr = xread(fd, buffer + size, nr);
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if (!nr)
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break;
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if (nr < 0)
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die("git-apply: read returned %s", strerror(errno));
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size += nr;
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}
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*sizep = size;
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/*
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* Make sure that we have some slop in the buffer
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* so that we can do speculative "memcmp" etc, and
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* see to it that it is NUL-filled.
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*/
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if (alloc < size + SLOP)
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buffer = xrealloc(buffer, size + SLOP);
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memset(buffer + size, 0, SLOP);
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return buffer;
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}
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static unsigned long linelen(const char *buffer, unsigned long size)
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{
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unsigned long len = 0;
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while (size--) {
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len++;
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if (*buffer++ == '\n')
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break;
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}
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return len;
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}
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static int is_dev_null(const char *str)
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{
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return !memcmp("/dev/null", str, 9) && isspace(str[9]);
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}
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#define TERM_SPACE 1
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#define TERM_TAB 2
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static int name_terminate(const char *name, int namelen, int c, int terminate)
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{
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if (c == ' ' && !(terminate & TERM_SPACE))
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return 0;
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if (c == '\t' && !(terminate & TERM_TAB))
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return 0;
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return 1;
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}
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static char * find_name(const char *line, char *def, int p_value, int terminate)
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{
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int len;
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const char *start = line;
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char *name;
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if (*line == '"') {
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/* Proposed "new-style" GNU patch/diff format; see
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* http://marc.theaimsgroup.com/?l=git&m=112927316408690&w=2
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*/
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name = unquote_c_style(line, NULL);
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if (name) {
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char *cp = name;
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while (p_value) {
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cp = strchr(name, '/');
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if (!cp)
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break;
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cp++;
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p_value--;
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}
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if (cp) {
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/* name can later be freed, so we need
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* to memmove, not just return cp
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*/
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memmove(name, cp, strlen(cp) + 1);
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free(def);
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return name;
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}
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else {
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free(name);
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name = NULL;
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}
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}
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}
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for (;;) {
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char c = *line;
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if (isspace(c)) {
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if (c == '\n')
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break;
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if (name_terminate(start, line-start, c, terminate))
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break;
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}
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line++;
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if (c == '/' && !--p_value)
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start = line;
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}
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if (!start)
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return def;
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len = line - start;
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if (!len)
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return def;
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/*
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* Generally we prefer the shorter name, especially
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* if the other one is just a variation of that with
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* something else tacked on to the end (ie "file.orig"
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* or "file~").
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*/
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if (def) {
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int deflen = strlen(def);
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if (deflen < len && !strncmp(start, def, deflen))
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return def;
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}
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name = xmalloc(len + 1);
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memcpy(name, start, len);
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name[len] = 0;
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free(def);
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return name;
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}
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/*
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* Get the name etc info from the --/+++ lines of a traditional patch header
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*
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* NOTE! This hardcodes "-p1" behaviour in filename detection.
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*
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* FIXME! The end-of-filename heuristics are kind of screwy. For existing
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* files, we can happily check the index for a match, but for creating a
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* new file we should try to match whatever "patch" does. I have no idea.
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*/
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static void parse_traditional_patch(const char *first, const char *second, struct patch *patch)
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{
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char *name;
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first += 4; // skip "--- "
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second += 4; // skip "+++ "
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if (is_dev_null(first)) {
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patch->is_new = 1;
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patch->is_delete = 0;
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name = find_name(second, NULL, p_value, TERM_SPACE | TERM_TAB);
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patch->new_name = name;
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} else if (is_dev_null(second)) {
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patch->is_new = 0;
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patch->is_delete = 1;
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name = find_name(first, NULL, p_value, TERM_SPACE | TERM_TAB);
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patch->old_name = name;
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} else {
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name = find_name(first, NULL, p_value, TERM_SPACE | TERM_TAB);
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name = find_name(second, name, p_value, TERM_SPACE | TERM_TAB);
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patch->old_name = patch->new_name = name;
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}
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if (!name)
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die("unable to find filename in patch at line %d", linenr);
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}
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static int gitdiff_hdrend(const char *line, struct patch *patch)
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{
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return -1;
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}
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/*
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* We're anal about diff header consistency, to make
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* sure that we don't end up having strange ambiguous
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* patches floating around.
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*
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* As a result, gitdiff_{old|new}name() will check
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* their names against any previous information, just
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* to make sure..
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*/
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static char *gitdiff_verify_name(const char *line, int isnull, char *orig_name, const char *oldnew)
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{
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if (!orig_name && !isnull)
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return find_name(line, NULL, 1, 0);
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if (orig_name) {
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int len;
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const char *name;
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char *another;
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name = orig_name;
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len = strlen(name);
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if (isnull)
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die("git-apply: bad git-diff - expected /dev/null, got %s on line %d", name, linenr);
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another = find_name(line, NULL, 1, 0);
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if (!another || memcmp(another, name, len))
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die("git-apply: bad git-diff - inconsistent %s filename on line %d", oldnew, linenr);
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free(another);
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return orig_name;
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}
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else {
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/* expect "/dev/null" */
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if (memcmp("/dev/null", line, 9) || line[9] != '\n')
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die("git-apply: bad git-diff - expected /dev/null on line %d", linenr);
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return NULL;
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}
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}
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static int gitdiff_oldname(const char *line, struct patch *patch)
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{
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patch->old_name = gitdiff_verify_name(line, patch->is_new, patch->old_name, "old");
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return 0;
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}
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static int gitdiff_newname(const char *line, struct patch *patch)
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{
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patch->new_name = gitdiff_verify_name(line, patch->is_delete, patch->new_name, "new");
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return 0;
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}
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static int gitdiff_oldmode(const char *line, struct patch *patch)
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{
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patch->old_mode = strtoul(line, NULL, 8);
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return 0;
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}
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static int gitdiff_newmode(const char *line, struct patch *patch)
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{
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patch->new_mode = strtoul(line, NULL, 8);
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return 0;
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}
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static int gitdiff_delete(const char *line, struct patch *patch)
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{
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patch->is_delete = 1;
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patch->old_name = patch->def_name;
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return gitdiff_oldmode(line, patch);
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}
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static int gitdiff_newfile(const char *line, struct patch *patch)
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{
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patch->is_new = 1;
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patch->new_name = patch->def_name;
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return gitdiff_newmode(line, patch);
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}
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static int gitdiff_copysrc(const char *line, struct patch *patch)
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{
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patch->is_copy = 1;
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patch->old_name = find_name(line, NULL, 0, 0);
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return 0;
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}
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static int gitdiff_copydst(const char *line, struct patch *patch)
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{
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patch->is_copy = 1;
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patch->new_name = find_name(line, NULL, 0, 0);
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return 0;
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}
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static int gitdiff_renamesrc(const char *line, struct patch *patch)
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{
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patch->is_rename = 1;
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patch->old_name = find_name(line, NULL, 0, 0);
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return 0;
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}
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static int gitdiff_renamedst(const char *line, struct patch *patch)
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{
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patch->is_rename = 1;
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patch->new_name = find_name(line, NULL, 0, 0);
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return 0;
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}
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static int gitdiff_similarity(const char *line, struct patch *patch)
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{
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if ((patch->score = strtoul(line, NULL, 10)) == ULONG_MAX)
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patch->score = 0;
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return 0;
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}
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static int gitdiff_dissimilarity(const char *line, struct patch *patch)
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{
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if ((patch->score = strtoul(line, NULL, 10)) == ULONG_MAX)
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patch->score = 0;
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return 0;
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}
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static int gitdiff_index(const char *line, struct patch *patch)
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{
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/* index line is N hexadecimal, "..", N hexadecimal,
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* and optional space with octal mode.
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*/
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const char *ptr, *eol;
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int len;
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ptr = strchr(line, '.');
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if (!ptr || ptr[1] != '.' || 40 < ptr - line)
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return 0;
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len = ptr - line;
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memcpy(patch->old_sha1_prefix, line, len);
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patch->old_sha1_prefix[len] = 0;
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line = ptr + 2;
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ptr = strchr(line, ' ');
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eol = strchr(line, '\n');
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|
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if (!ptr || eol < ptr)
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ptr = eol;
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len = ptr - line;
|
|
|
|
if (40 < len)
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return 0;
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memcpy(patch->new_sha1_prefix, line, len);
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patch->new_sha1_prefix[len] = 0;
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if (*ptr == ' ')
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patch->new_mode = patch->old_mode = strtoul(ptr+1, NULL, 8);
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return 0;
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}
|
|
|
|
/*
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* This is normal for a diff that doesn't change anything: we'll fall through
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* into the next diff. Tell the parser to break out.
|
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*/
|
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static int gitdiff_unrecognized(const char *line, struct patch *patch)
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|
{
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return -1;
|
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}
|
|
|
|
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 == '/')
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|
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;
|
|
const char *name;
|
|
const char *second = NULL;
|
|
|
|
line += strlen("diff --git ");
|
|
llen -= strlen("diff --git ");
|
|
|
|
if (*line == '"') {
|
|
const char *cp;
|
|
char *first = unquote_c_style(line, &second);
|
|
if (!first)
|
|
return NULL;
|
|
|
|
/* 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;
|
|
}
|
|
|
|
/* 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.
|
|
*/
|
|
for (len = 0 ; ; len++) {
|
|
char c = name[len];
|
|
|
|
switch (c) {
|
|
default:
|
|
continue;
|
|
case '\n':
|
|
return NULL;
|
|
case '\t': case ' ':
|
|
second = name+len;
|
|
for (;;) {
|
|
char c = *second++;
|
|
if (c == '\n')
|
|
return NULL;
|
|
if (c == '/')
|
|
break;
|
|
}
|
|
if (second[len] == '\n' && !memcmp(name, second, len)) {
|
|
char *ret = xmalloc(len + 1);
|
|
memcpy(ret, name, len);
|
|
ret[len] = 0;
|
|
return ret;
|
|
}
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/* Verify that we recognize the lines following a git header */
|
|
static int parse_git_header(char *line, int len, unsigned int size, struct patch *patch)
|
|
{
|
|
unsigned long offset;
|
|
|
|
/* A git diff has explicit new/delete information, so we don't guess */
|
|
patch->is_new = 0;
|
|
patch->is_delete = 0;
|
|
|
|
/*
|
|
* Some things may not have the old name in the
|
|
* rest of the headers anywhere (pure mode changes,
|
|
* or removing or adding empty files), so we get
|
|
* the default name from the header.
|
|
*/
|
|
patch->def_name = git_header_name(line, len);
|
|
|
|
line += len;
|
|
size -= len;
|
|
linenr++;
|
|
for (offset = len ; size > 0 ; offset += len, size -= len, line += len, linenr++) {
|
|
static const struct opentry {
|
|
const char *str;
|
|
int (*fn)(const char *, struct patch *);
|
|
} optable[] = {
|
|
{ "@@ -", gitdiff_hdrend },
|
|
{ "--- ", gitdiff_oldname },
|
|
{ "+++ ", gitdiff_newname },
|
|
{ "old mode ", gitdiff_oldmode },
|
|
{ "new mode ", gitdiff_newmode },
|
|
{ "deleted file mode ", gitdiff_delete },
|
|
{ "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;
|
|
|
|
len = linelen(line, size);
|
|
if (!len || line[len-1] != '\n')
|
|
break;
|
|
for (i = 0; i < ARRAY_SIZE(optable); i++) {
|
|
const struct opentry *p = optable + i;
|
|
int oplen = strlen(p->str);
|
|
if (len < oplen || memcmp(p->str, line, oplen))
|
|
continue;
|
|
if (p->fn(line + oplen, patch) < 0)
|
|
return offset;
|
|
break;
|
|
}
|
|
}
|
|
|
|
return offset;
|
|
}
|
|
|
|
static int parse_num(const char *line, unsigned long *p)
|
|
{
|
|
char *ptr;
|
|
|
|
if (!isdigit(*line))
|
|
return 0;
|
|
*p = strtoul(line, &ptr, 10);
|
|
return ptr - line;
|
|
}
|
|
|
|
static int parse_range(const char *line, int len, int offset, const char *expect,
|
|
unsigned long *p1, unsigned long *p2)
|
|
{
|
|
int digits, ex;
|
|
|
|
if (offset < 0 || offset >= len)
|
|
return -1;
|
|
line += offset;
|
|
len -= offset;
|
|
|
|
digits = parse_num(line, p1);
|
|
if (!digits)
|
|
return -1;
|
|
|
|
offset += digits;
|
|
line += digits;
|
|
len -= digits;
|
|
|
|
*p2 = 1;
|
|
if (*line == ',') {
|
|
digits = parse_num(line+1, p2);
|
|
if (!digits)
|
|
return -1;
|
|
|
|
offset += digits+1;
|
|
line += digits+1;
|
|
len -= digits+1;
|
|
}
|
|
|
|
ex = strlen(expect);
|
|
if (ex > len)
|
|
return -1;
|
|
if (memcmp(line, expect, ex))
|
|
return -1;
|
|
|
|
return offset + ex;
|
|
}
|
|
|
|
/*
|
|
* Parse a unified diff fragment header of the
|
|
* form "@@ -a,b +c,d @@"
|
|
*/
|
|
static int parse_fragment_header(char *line, int len, struct fragment *fragment)
|
|
{
|
|
int offset;
|
|
|
|
if (!len || line[len-1] != '\n')
|
|
return -1;
|
|
|
|
/* Figure out the number of lines in a fragment */
|
|
offset = parse_range(line, len, 4, " +", &fragment->oldpos, &fragment->oldlines);
|
|
offset = parse_range(line, len, offset, " @@", &fragment->newpos, &fragment->newlines);
|
|
|
|
return offset;
|
|
}
|
|
|
|
static int find_header(char *line, unsigned long size, int *hdrsize, struct patch *patch)
|
|
{
|
|
unsigned long offset, len;
|
|
|
|
patch->is_rename = patch->is_copy = 0;
|
|
patch->is_new = patch->is_delete = -1;
|
|
patch->old_mode = patch->new_mode = 0;
|
|
patch->old_name = patch->new_name = NULL;
|
|
for (offset = 0; size > 0; offset += len, size -= len, line += len, linenr++) {
|
|
unsigned long nextlen;
|
|
|
|
len = linelen(line, size);
|
|
if (!len)
|
|
break;
|
|
|
|
/* Testing this early allows us to take a few shortcuts.. */
|
|
if (len < 6)
|
|
continue;
|
|
|
|
/*
|
|
* Make sure we don't find any unconnected patch fragmants.
|
|
* That's a sign that we didn't find a header, and that a
|
|
* patch has become corrupted/broken up.
|
|
*/
|
|
if (!memcmp("@@ -", line, 4)) {
|
|
struct fragment dummy;
|
|
if (parse_fragment_header(line, len, &dummy) < 0)
|
|
continue;
|
|
error("patch fragment without header at line %d: %.*s", linenr, (int)len-1, line);
|
|
}
|
|
|
|
if (size < len + 6)
|
|
break;
|
|
|
|
/*
|
|
* Git patch? It might not have a real patch, just a rename
|
|
* or mode change, so we handle that specially
|
|
*/
|
|
if (!memcmp("diff --git ", line, 11)) {
|
|
int git_hdr_len = parse_git_header(line, len, size, patch);
|
|
if (git_hdr_len <= len)
|
|
continue;
|
|
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;
|
|
}
|
|
|
|
/** --- followed by +++ ? */
|
|
if (memcmp("--- ", line, 4) || memcmp("+++ ", line + len, 4))
|
|
continue;
|
|
|
|
/*
|
|
* We only accept unified patches, so we want it to
|
|
* at least have "@@ -a,b +c,d @@\n", which is 14 chars
|
|
* minimum
|
|
*/
|
|
nextlen = linelen(line + len, size - len);
|
|
if (size < nextlen + 14 || memcmp("@@ -", line + len + nextlen, 4))
|
|
continue;
|
|
|
|
/* Ok, we'll consider it a patch */
|
|
parse_traditional_patch(line, line+len, patch);
|
|
*hdrsize = len + nextlen;
|
|
linenr += 2;
|
|
return offset;
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
/*
|
|
* Parse a unified diff. Note that this really needs
|
|
* to parse each fragment separately, since the only
|
|
* way to know the difference between a "---" that is
|
|
* part of a patch, and a "---" that starts the next
|
|
* patch is to look at the line counts..
|
|
*/
|
|
static int parse_fragment(char *line, unsigned long size, struct patch *patch, struct fragment *fragment)
|
|
{
|
|
int added, deleted;
|
|
int len = linelen(line, size), offset;
|
|
unsigned long oldlines, newlines;
|
|
unsigned long leading, trailing;
|
|
|
|
offset = parse_fragment_header(line, len, fragment);
|
|
if (offset < 0)
|
|
return -1;
|
|
oldlines = fragment->oldlines;
|
|
newlines = fragment->newlines;
|
|
leading = 0;
|
|
trailing = 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;
|
|
size -= len;
|
|
linenr++;
|
|
added = deleted = 0;
|
|
for (offset = len; size > 0; offset += len, size -= len, line += len, linenr++) {
|
|
if (!oldlines && !newlines)
|
|
break;
|
|
len = linelen(line, size);
|
|
if (!len || line[len-1] != '\n')
|
|
return -1;
|
|
switch (*line) {
|
|
default:
|
|
return -1;
|
|
case ' ':
|
|
oldlines--;
|
|
newlines--;
|
|
if (!deleted && !added)
|
|
leading++;
|
|
trailing++;
|
|
break;
|
|
case '-':
|
|
deleted++;
|
|
oldlines--;
|
|
trailing = 0;
|
|
break;
|
|
case '+':
|
|
/*
|
|
* We know len is at least two, since we have a '+' and
|
|
* we checked that the last character was a '\n' above.
|
|
* That is, an addition of an empty line would check
|
|
* the '+' here. Sneaky...
|
|
*/
|
|
if ((new_whitespace != nowarn_whitespace) &&
|
|
isspace(line[len-2])) {
|
|
whitespace_error++;
|
|
if (squelch_whitespace_errors &&
|
|
squelch_whitespace_errors <
|
|
whitespace_error)
|
|
;
|
|
else {
|
|
fprintf(stderr, "Adds trailing whitespace.\n%s:%d:%.*s\n",
|
|
patch_input_file,
|
|
linenr, len-2, line+1);
|
|
}
|
|
}
|
|
added++;
|
|
newlines--;
|
|
trailing = 0;
|
|
break;
|
|
|
|
/* 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 (oldlines || newlines)
|
|
return -1;
|
|
fragment->leading = leading;
|
|
fragment->trailing = trailing;
|
|
|
|
/* 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;
|
|
}
|
|
|
|
static int parse_single_patch(char *line, unsigned long size, struct patch *patch)
|
|
{
|
|
unsigned long offset = 0;
|
|
struct fragment **fragp = &patch->fragments;
|
|
|
|
while (size > 4 && !memcmp(line, "@@ -", 4)) {
|
|
struct fragment *fragment;
|
|
int len;
|
|
|
|
fragment = xcalloc(1, sizeof(*fragment));
|
|
len = parse_fragment(line, size, patch, fragment);
|
|
if (len <= 0)
|
|
die("corrupt patch at line %d", linenr);
|
|
|
|
fragment->patch = line;
|
|
fragment->size = len;
|
|
|
|
*fragp = fragment;
|
|
fragp = &fragment->next;
|
|
|
|
offset += len;
|
|
line += len;
|
|
size -= len;
|
|
}
|
|
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_binary(char *buffer, unsigned long size, struct patch *patch)
|
|
{
|
|
/* We have read "GIT binary patch\n"; what follows is a
|
|
* sequence of 'length-byte' followed by base-85 encoded
|
|
* delta data.
|
|
*
|
|
* Each 5-byte sequence of base-85 encodes up to 4 bytes,
|
|
* and we would limit the patch line to 66 characters,
|
|
* so one line can fit up to 13 groups that would decode
|
|
* to 52 bytes max. The length byte 'A'-'Z' corresponds
|
|
* to 1-26 bytes, and 'a'-'z' corresponds to 27-52 bytes.
|
|
* The end of binary is signalled with an empty line.
|
|
*/
|
|
int llen, used;
|
|
struct fragment *fragment;
|
|
char *delta = NULL;
|
|
|
|
patch->is_binary = 1;
|
|
patch->fragments = fragment = xcalloc(1, sizeof(*fragment));
|
|
used = 0;
|
|
while (1) {
|
|
int byte_length, max_byte_length, newsize;
|
|
llen = linelen(buffer, size);
|
|
used += llen;
|
|
linenr++;
|
|
if (llen == 1)
|
|
break;
|
|
/* Minimum line is "A00000\n" which is 7-byte long,
|
|
* and the line length must be multiple of 5 plus 2.
|
|
*/
|
|
if ((llen < 7) || (llen-2) % 5)
|
|
goto corrupt;
|
|
max_byte_length = (llen - 2) / 5 * 4;
|
|
byte_length = *buffer;
|
|
if ('A' <= byte_length && byte_length <= 'Z')
|
|
byte_length = byte_length - 'A' + 1;
|
|
else if ('a' <= byte_length && byte_length <= 'z')
|
|
byte_length = byte_length - 'a' + 27;
|
|
else
|
|
goto corrupt;
|
|
/* if the input length was not multiple of 4, we would
|
|
* have filler at the end but the filler should never
|
|
* exceed 3 bytes
|
|
*/
|
|
if (max_byte_length < byte_length ||
|
|
byte_length <= max_byte_length - 4)
|
|
goto corrupt;
|
|
newsize = fragment->size + byte_length;
|
|
delta = xrealloc(delta, newsize);
|
|
if (decode_85(delta + fragment->size,
|
|
buffer + 1,
|
|
byte_length))
|
|
goto corrupt;
|
|
fragment->size = newsize;
|
|
buffer += llen;
|
|
size -= llen;
|
|
}
|
|
fragment->patch = delta;
|
|
return used;
|
|
corrupt:
|
|
return error("corrupt binary patch at line %d: %.*s",
|
|
linenr-1, llen-1, buffer);
|
|
}
|
|
|
|
static int parse_chunk(char *buffer, unsigned long size, struct patch *patch)
|
|
{
|
|
int hdrsize, patchsize;
|
|
int offset = find_header(buffer, size, &hdrsize, patch);
|
|
|
|
if (offset < 0)
|
|
return offset;
|
|
|
|
patchsize = parse_single_patch(buffer + offset + hdrsize, size - offset - hdrsize, patch);
|
|
|
|
if (!patchsize) {
|
|
static const char *binhdr[] = {
|
|
"Binary files ",
|
|
"Files ",
|
|
NULL,
|
|
};
|
|
static const char git_binary[] = "GIT binary patch\n";
|
|
int i;
|
|
int hd = hdrsize + offset;
|
|
unsigned long llen = linelen(buffer + hd, size - hd);
|
|
|
|
if (llen == sizeof(git_binary) - 1 &&
|
|
!memcmp(git_binary, buffer + hd, llen)) {
|
|
int used;
|
|
linenr++;
|
|
used = parse_binary(buffer + hd + llen,
|
|
size - hd - llen, patch);
|
|
if (used)
|
|
patchsize = used + llen;
|
|
else
|
|
patchsize = 0;
|
|
}
|
|
else 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)) {
|
|
linenr++;
|
|
patch->is_binary = 1;
|
|
patchsize = llen;
|
|
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;
|
|
}
|
|
|
|
static const char pluses[] = "++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++";
|
|
static const char minuses[]= "----------------------------------------------------------------------";
|
|
|
|
static void show_stats(struct patch *patch)
|
|
{
|
|
const char *prefix = "";
|
|
char *name = patch->new_name;
|
|
char *qname = NULL;
|
|
int len, max, add, del, total;
|
|
|
|
if (!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
|
|
*/
|
|
len = strlen(name);
|
|
max = max_len;
|
|
if (max > 50)
|
|
max = 50;
|
|
if (len > max) {
|
|
char *slash;
|
|
prefix = "...";
|
|
max -= 3;
|
|
name += len - max;
|
|
slash = strchr(name, '/');
|
|
if (slash)
|
|
name = slash;
|
|
}
|
|
len = max;
|
|
|
|
/*
|
|
* scale the add/delete
|
|
*/
|
|
max = max_change;
|
|
if (max + len > 70)
|
|
max = 70 - len;
|
|
|
|
add = patch->lines_added;
|
|
del = patch->lines_deleted;
|
|
total = add + del;
|
|
|
|
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 = xread(fd, buf + got, size - got);
|
|
if (ret <= 0)
|
|
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 *lines)
|
|
{
|
|
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;
|
|
*lines = n;
|
|
return try;
|
|
}
|
|
|
|
/*
|
|
* We should start searching forward and backward.
|
|
*/
|
|
return -1;
|
|
}
|
|
|
|
static void remove_first_line(const char **rbuf, int *rsize)
|
|
{
|
|
const char *buf = *rbuf;
|
|
int size = *rsize;
|
|
unsigned long offset;
|
|
offset = 0;
|
|
while (offset <= size) {
|
|
if (buf[offset++] == '\n')
|
|
break;
|
|
}
|
|
*rsize = size - offset;
|
|
*rbuf = buf + offset;
|
|
}
|
|
|
|
static void remove_last_line(const char **rbuf, int *rsize)
|
|
{
|
|
const char *buf = *rbuf;
|
|
int size = *rsize;
|
|
unsigned long offset;
|
|
offset = size - 1;
|
|
while (offset > 0) {
|
|
if (buf[--offset] == '\n')
|
|
break;
|
|
}
|
|
*rsize = offset + 1;
|
|
}
|
|
|
|
struct buffer_desc {
|
|
char *buffer;
|
|
unsigned long size;
|
|
unsigned long alloc;
|
|
};
|
|
|
|
static int apply_line(char *output, const char *patch, int plen)
|
|
{
|
|
/* plen is number of bytes to be copied from patch,
|
|
* starting at patch+1 (patch[0] is '+'). Typically
|
|
* patch[plen] is '\n'.
|
|
*/
|
|
int add_nl_to_tail = 0;
|
|
if ((new_whitespace == strip_whitespace) &&
|
|
1 < plen && isspace(patch[plen-1])) {
|
|
if (patch[plen] == '\n')
|
|
add_nl_to_tail = 1;
|
|
plen--;
|
|
while (0 < plen && isspace(patch[plen]))
|
|
plen--;
|
|
applied_after_stripping++;
|
|
}
|
|
memcpy(output, patch + 1, plen);
|
|
if (add_nl_to_tail)
|
|
output[plen++] = '\n';
|
|
return plen;
|
|
}
|
|
|
|
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);
|
|
const char *oldlines, *newlines;
|
|
int oldsize = 0, newsize = 0;
|
|
unsigned long leading, trailing;
|
|
int pos, lines;
|
|
|
|
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)
|
|
newsize += apply_line(new + newsize, patch,
|
|
plen);
|
|
break;
|
|
case '@': case '\\':
|
|
/* Ignore it, we already handled it */
|
|
break;
|
|
default:
|
|
return -1;
|
|
}
|
|
patch += len;
|
|
size -= len;
|
|
}
|
|
|
|
#ifdef NO_ACCURATE_DIFF
|
|
if (oldsize > 0 && old[oldsize - 1] == '\n' &&
|
|
newsize > 0 && new[newsize - 1] == '\n') {
|
|
oldsize--;
|
|
newsize--;
|
|
}
|
|
#endif
|
|
|
|
oldlines = old;
|
|
newlines = new;
|
|
leading = frag->leading;
|
|
trailing = frag->trailing;
|
|
lines = 0;
|
|
pos = frag->newpos;
|
|
for (;;) {
|
|
offset = find_offset(buf, desc->size, oldlines, oldsize, pos, &lines);
|
|
if (offset >= 0) {
|
|
int diff = newsize - oldsize;
|
|
unsigned long size = desc->size + diff;
|
|
unsigned long alloc = desc->alloc;
|
|
|
|
/* Warn if it was necessary to reduce the number
|
|
* of context lines.
|
|
*/
|
|
if ((leading != frag->leading) || (trailing != frag->trailing))
|
|
fprintf(stderr, "Context reduced to (%ld/%ld) to apply fragment at %d\n",
|
|
leading, trailing, pos + lines);
|
|
|
|
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, newlines, newsize);
|
|
offset = 0;
|
|
|
|
break;
|
|
}
|
|
|
|
/* Am I at my context limits? */
|
|
if ((leading <= p_context) && (trailing <= p_context))
|
|
break;
|
|
/* Reduce the number of context lines
|
|
* Reduce both leading and trailing if they are equal
|
|
* otherwise just reduce the larger context.
|
|
*/
|
|
if (leading >= trailing) {
|
|
remove_first_line(&oldlines, &oldsize);
|
|
remove_first_line(&newlines, &newsize);
|
|
pos--;
|
|
leading--;
|
|
}
|
|
if (trailing > leading) {
|
|
remove_last_line(&oldlines, &oldsize);
|
|
remove_last_line(&newlines, &newsize);
|
|
trailing--;
|
|
}
|
|
}
|
|
|
|
free(old);
|
|
free(new);
|
|
return offset;
|
|
}
|
|
|
|
static int apply_binary(struct buffer_desc *desc, struct patch *patch)
|
|
{
|
|
const char *name = patch->old_name ? patch->old_name : patch->new_name;
|
|
unsigned char sha1[20];
|
|
unsigned char hdr[50];
|
|
int hdrlen;
|
|
|
|
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) {
|
|
/* See if the old one matches what the patch
|
|
* applies to.
|
|
*/
|
|
write_sha1_file_prepare(desc->buffer, desc->size,
|
|
blob_type, 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);
|
|
}
|
|
|
|
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))
|
|
return 0; /* deletion patch */
|
|
|
|
if (has_sha1_file(sha1)) {
|
|
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' cannot be read",
|
|
patch->new_sha1_prefix, name);
|
|
desc->alloc = desc->size = size;
|
|
}
|
|
else {
|
|
char type[10];
|
|
unsigned long src_size, dst_size;
|
|
void *src;
|
|
|
|
get_sha1_hex(patch->old_sha1_prefix, sha1);
|
|
src = read_sha1_file(sha1, type, &src_size);
|
|
if (!src)
|
|
return error("the necessary preimage %s for "
|
|
"'%s' cannot be read",
|
|
patch->old_sha1_prefix, name);
|
|
|
|
/* patch->fragment->patch has the delta data and
|
|
* we should apply it to the preimage.
|
|
*/
|
|
desc->buffer = patch_delta(src, src_size,
|
|
(void*) patch->fragments->patch,
|
|
patch->fragments->size,
|
|
&dst_size);
|
|
if (!desc->buffer)
|
|
return error("binary patch does not apply to '%s'",
|
|
name);
|
|
desc->size = desc->alloc = dst_size;
|
|
|
|
/* verify that the result matches */
|
|
write_sha1_file_prepare(desc->buffer, desc->size, blob_type,
|
|
sha1, hdr, &hdrlen);
|
|
if (strcmp(sha1_to_hex(sha1), patch->new_sha1_prefix))
|
|
return error("binary patch to '%s' creates incorrect result", name);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
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)
|
|
return apply_binary(desc, patch);
|
|
|
|
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)
|
|
{
|
|
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 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,
|
|
NULL) ||
|
|
lstat(old_name, &st))
|
|
return -1;
|
|
}
|
|
|
|
changed = ce_match_stat(active_cache[pos], &st, 1);
|
|
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 (patch->is_new < 0)
|
|
patch->is_new = 0;
|
|
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 (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;
|
|
}
|
|
|
|
static int check_patch_list(struct patch *patch)
|
|
{
|
|
int error = 0;
|
|
|
|
for (;patch ; patch = patch->next)
|
|
error |= check_patch(patch);
|
|
return error;
|
|
}
|
|
|
|
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 ",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);
|
|
}
|
|
}
|
|
|
|
static void stat_patch_list(struct patch *patch)
|
|
{
|
|
int files, adds, dels;
|
|
|
|
for (files = adds = dels = 0 ; patch ; patch = patch->next) {
|
|
files++;
|
|
adds += patch->lines_added;
|
|
dels += patch->lines_deleted;
|
|
show_stats(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;
|
|
|
|
if (lines > max_change)
|
|
max_change = lines;
|
|
if (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 = 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 = xcalloc(1, 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_type, 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 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, (mode & 0100) ? 0777 : 0666);
|
|
if (fd < 0)
|
|
return -1;
|
|
while (size) {
|
|
int written = xwrite(fd, buf, size);
|
|
if (written < 0)
|
|
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(char *path, unsigned mode, const char *buf, unsigned long size)
|
|
{
|
|
if (!try_create_file(path, mode, buf, size))
|
|
return;
|
|
|
|
if (errno == ENOENT) {
|
|
if (safe_create_leading_directories(path))
|
|
return;
|
|
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;
|
|
++nr;
|
|
}
|
|
}
|
|
die("unable to write file %s mode %o", path, mode);
|
|
}
|
|
|
|
static void create_file(struct patch *patch)
|
|
{
|
|
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;
|
|
}
|
|
if (0 < prefix_length) {
|
|
int pathlen = strlen(pathname);
|
|
if (pathlen <= prefix_length ||
|
|
memcmp(prefix, pathname, prefix_length))
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
static int apply_patch(int fd, const char *filename)
|
|
{
|
|
int newfd;
|
|
unsigned long offset, size;
|
|
char *buffer = read_patch_file(fd, &size);
|
|
struct patch *list = NULL, **listp = &list;
|
|
int skipped_patch = 0;
|
|
|
|
patch_input_file = filename;
|
|
if (!buffer)
|
|
return -1;
|
|
offset = 0;
|
|
while (size > 0) {
|
|
struct patch *patch;
|
|
int nr;
|
|
|
|
patch = xcalloc(1, sizeof(*patch));
|
|
nr = parse_chunk(buffer + offset, size, patch);
|
|
if (nr < 0)
|
|
break;
|
|
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;
|
|
if (whitespace_error && (new_whitespace == error_on_whitespace))
|
|
apply = 0;
|
|
|
|
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 (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;
|
|
}
|
|
|
|
static int git_apply_config(const char *var, const char *value)
|
|
{
|
|
if (!strcmp(var, "apply.whitespace")) {
|
|
apply_default_whitespace = strdup(value);
|
|
return 0;
|
|
}
|
|
return git_default_config(var, value);
|
|
}
|
|
|
|
|
|
int main(int argc, char **argv)
|
|
{
|
|
int i;
|
|
int read_stdin = 1;
|
|
const char *whitespace_option = NULL;
|
|
|
|
for (i = 1; i < argc; i++) {
|
|
const char *arg = argv[i];
|
|
char *end;
|
|
int fd;
|
|
|
|
if (!strcmp(arg, "-")) {
|
|
apply_patch(0, "<stdin>");
|
|
read_stdin = 0;
|
|
continue;
|
|
}
|
|
if (!strncmp(arg, "--exclude=", 10)) {
|
|
struct excludes *x = xmalloc(sizeof(*x));
|
|
x->path = arg + 10;
|
|
x->next = excludes;
|
|
excludes = x;
|
|
continue;
|
|
}
|
|
if (!strncmp(arg, "-p", 2)) {
|
|
p_value = atoi(arg + 2);
|
|
continue;
|
|
}
|
|
if (!strcmp(arg, "--no-add")) {
|
|
no_add = 1;
|
|
continue;
|
|
}
|
|
if (!strcmp(arg, "--stat")) {
|
|
apply = 0;
|
|
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, "--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;
|
|
}
|
|
if (!strncmp(arg, "-C", 2)) {
|
|
p_context = strtoul(arg + 2, &end, 0);
|
|
if (*end != '\0')
|
|
die("unrecognized context count '%s'", arg + 2);
|
|
continue;
|
|
}
|
|
if (!strncmp(arg, "--whitespace=", 13)) {
|
|
whitespace_option = arg + 13;
|
|
parse_whitespace_option(arg + 13);
|
|
continue;
|
|
}
|
|
|
|
if (check_index && prefix_length < 0) {
|
|
prefix = setup_git_directory();
|
|
prefix_length = prefix ? strlen(prefix) : 0;
|
|
git_config(git_apply_config);
|
|
if (!whitespace_option && apply_default_whitespace)
|
|
parse_whitespace_option(apply_default_whitespace);
|
|
}
|
|
if (0 < prefix_length)
|
|
arg = prefix_filename(prefix, prefix_length, arg);
|
|
|
|
fd = open(arg, O_RDONLY);
|
|
if (fd < 0)
|
|
usage(apply_usage);
|
|
read_stdin = 0;
|
|
set_default_whitespace_mode(whitespace_option);
|
|
apply_patch(fd, arg);
|
|
close(fd);
|
|
}
|
|
set_default_whitespace_mode(whitespace_option);
|
|
if (read_stdin)
|
|
apply_patch(0, "<stdin>");
|
|
if (whitespace_error) {
|
|
if (squelch_whitespace_errors &&
|
|
squelch_whitespace_errors < whitespace_error) {
|
|
int squelched =
|
|
whitespace_error - squelch_whitespace_errors;
|
|
fprintf(stderr, "warning: squelched %d whitespace error%s\n",
|
|
squelched,
|
|
squelched == 1 ? "" : "s");
|
|
}
|
|
if (new_whitespace == error_on_whitespace)
|
|
die("%d line%s add%s trailing whitespaces.",
|
|
whitespace_error,
|
|
whitespace_error == 1 ? "" : "s",
|
|
whitespace_error == 1 ? "s" : "");
|
|
if (applied_after_stripping)
|
|
fprintf(stderr, "warning: %d line%s applied after"
|
|
" stripping trailing whitespaces.\n",
|
|
applied_after_stripping,
|
|
applied_after_stripping == 1 ? "" : "s");
|
|
else if (whitespace_error)
|
|
fprintf(stderr, "warning: %d line%s add%s trailing"
|
|
" whitespaces.\n",
|
|
whitespace_error,
|
|
whitespace_error == 1 ? "" : "s",
|
|
whitespace_error == 1 ? "s" : "");
|
|
}
|
|
return 0;
|
|
}
|