mirror of
https://github.com/git/git
synced 2024-07-17 02:57:48 +00:00
3cca928d4a
Right now it requires that the fragment offsets be exact, and it doesn't actually apply the fragment yet, but it does find where it goes and verify the data. Next step: actually applying the fragment changes.
1102 lines
25 KiB
C
1102 lines
25 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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* NOTE! It does all its work in the index file, and only cares about
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* the files in the working directory if you tell it to "merge" the
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* patch apply.
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*
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* Even when merging it always takes the source from the index, and
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* uses the working tree as a "branch" for a 3-way merge.
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*/
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#include <ctype.h>
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#include "cache.h"
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// We default to the merge behaviour, since that's what most people would
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// expect.
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//
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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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// --show-files shows the directory changes
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//
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static int merge_patch = 1;
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static int check_index = 0;
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static int diffstat = 0;
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static int check = 0;
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static int apply = 1;
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static int show_files = 0;
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static const char apply_usage[] = "git-apply [--stat] [--check] [--show-files] <patch>";
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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 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;
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int lines_added, lines_deleted;
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struct fragment *fragments;
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const char *result;
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unsigned long resultsize;
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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 = read(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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if (errno == EAGAIN)
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continue;
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die("git-apply: read returned %s", strerror(errno));
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}
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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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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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int p_value = 1;
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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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int len;
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const char *name;
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if (!orig_name && !isnull)
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return find_name(line, NULL, 1, 0);
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name = "/dev/null";
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len = 9;
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if (orig_name) {
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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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}
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if (*name == '/')
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goto absolute_path;
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for (;;) {
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char c = *line++;
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if (c == '\n')
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break;
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if (c != '/')
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continue;
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absolute_path:
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if (memcmp(line, name, len) || line[len] != '\n')
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break;
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return orig_name;
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}
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die("git-apply: bad git-diff - inconsistent %s filename on line %d", oldnew, linenr);
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return NULL;
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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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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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return 0;
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}
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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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}
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static char *git_header_name(char *line)
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{
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int len;
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char *name, *second;
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/*
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* Find the first '/'
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*/
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name = line;
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for (;;) {
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char c = *name++;
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if (c == '\n')
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return NULL;
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if (c == '/')
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break;
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}
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/*
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* We don't accept absolute paths (/dev/null) as possibly valid
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*/
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if (name == line+1)
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return NULL;
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/*
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* Accept a name only if it shows up twice, exactly the same
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* form.
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*/
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for (len = 0 ; ; len++) {
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char c = name[len];
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switch (c) {
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default:
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continue;
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case '\n':
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break;
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case '\t': case ' ':
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second = name+len;
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for (;;) {
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char c = *second++;
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if (c == '\n')
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return NULL;
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if (c == '/')
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break;
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}
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if (second[len] == '\n' && !memcmp(name, second, len)) {
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char *ret = xmalloc(len + 1);
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memcpy(ret, name, len);
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ret[len] = 0;
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return ret;
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}
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}
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}
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return NULL;
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}
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/* Verify that we recognize the lines following a git header */
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static int parse_git_header(char *line, int len, unsigned int size, struct patch *patch)
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{
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unsigned long offset;
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/* A git diff has explicit new/delete information, so we don't guess */
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patch->is_new = 0;
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patch->is_delete = 0;
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/*
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* Some things may not have the old name in the
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* rest of the headers anywhere (pure mode changes,
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* or removing or adding empty files), so we get
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* the default name from the header.
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*/
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patch->def_name = git_header_name(line + strlen("diff --git "));
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line += len;
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size -= len;
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linenr++;
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for (offset = len ; size > 0 ; offset += len, size -= len, line += len, linenr++) {
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static const struct opentry {
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const char *str;
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int (*fn)(const char *, struct patch *);
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} optable[] = {
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{ "@@ -", gitdiff_hdrend },
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{ "--- ", gitdiff_oldname },
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{ "+++ ", gitdiff_newname },
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{ "old mode ", gitdiff_oldmode },
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{ "new mode ", gitdiff_newmode },
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{ "deleted file mode ", gitdiff_delete },
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{ "new file mode ", gitdiff_newfile },
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{ "copy from ", gitdiff_copysrc },
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{ "copy to ", gitdiff_copydst },
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{ "rename from ", gitdiff_renamesrc },
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{ "rename to ", gitdiff_renamedst },
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{ "similarity index ", gitdiff_similarity },
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{ "dissimilarity index ", gitdiff_dissimilarity },
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{ "", gitdiff_unrecognized },
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};
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int i;
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len = linelen(line, size);
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if (!len || line[len-1] != '\n')
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break;
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for (i = 0; i < sizeof(optable) / sizeof(optable[0]); i++) {
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const struct opentry *p = optable + i;
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int oplen = strlen(p->str);
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if (len < oplen || memcmp(p->str, line, oplen))
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continue;
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if (p->fn(line + oplen, patch) < 0)
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return offset;
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break;
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}
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}
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return offset;
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}
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static int parse_num(const char *line, unsigned long *p)
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{
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char *ptr;
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if (!isdigit(*line))
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return 0;
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*p = strtoul(line, &ptr, 10);
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return ptr - line;
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}
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|
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static int parse_range(const char *line, int len, int offset, const char *expect,
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unsigned long *p1, unsigned long *p2)
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{
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int digits, ex;
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if (offset < 0 || offset >= len)
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return -1;
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line += offset;
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len -= offset;
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digits = parse_num(line, p1);
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if (!digits)
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return -1;
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offset += digits;
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line += digits;
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len -= digits;
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|
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*p2 = *p1;
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if (*line == ',') {
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digits = parse_num(line+1, p2);
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if (!digits)
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return -1;
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|
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offset += digits+1;
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line += digits+1;
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len -= digits+1;
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}
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|
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ex = strlen(expect);
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if (ex > len)
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return -1;
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if (memcmp(line, expect, ex))
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return -1;
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|
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return offset + ex;
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}
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|
|
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/*
|
|
* Parse a unified diff fragment header of the
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* form "@@ -a,b +c,d @@"
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*/
|
|
static int parse_fragment_header(char *line, int len, struct fragment *fragment)
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|
{
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int offset;
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|
|
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if (!len || line[len-1] != '\n')
|
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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);
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|
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return offset;
|
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}
|
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|
|
static int find_header(char *line, unsigned long size, int *hdrsize, struct patch *patch)
|
|
{
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|
unsigned long offset, len;
|
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|
|
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, 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 < 0)
|
|
continue;
|
|
if (!patch->old_name && !patch->new_name)
|
|
die("git diff header lacks filename information");
|
|
*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 pos[4], oldlines, newlines;
|
|
|
|
offset = parse_fragment_header(line, len, fragment);
|
|
if (offset < 0)
|
|
return -1;
|
|
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;
|
|
|
|
/* 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--;
|
|
break;
|
|
case '-':
|
|
deleted++;
|
|
oldlines--;
|
|
break;
|
|
case '+':
|
|
added++;
|
|
newlines--;
|
|
break;
|
|
/* We allow "\ No newline at end of file" */
|
|
case '\\':
|
|
if (len < 12 || memcmp(line, "\\ No newline", 12))
|
|
return -1;
|
|
break;
|
|
}
|
|
}
|
|
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 = xmalloc(sizeof(*fragment));
|
|
memset(fragment, 0, 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 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);
|
|
|
|
return offset + hdrsize + patchsize;
|
|
}
|
|
|
|
const char pluses[] = "++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++";
|
|
const char minuses[]= "----------------------------------------------------------------------";
|
|
|
|
static void show_stats(struct patch *patch)
|
|
{
|
|
char *name = patch->old_name;
|
|
int len, max, add, del, total;
|
|
|
|
if (!name)
|
|
name = patch->new_name;
|
|
|
|
/*
|
|
* "scale" the filename
|
|
*/
|
|
len = strlen(name);
|
|
max = max_len;
|
|
if (max > 50)
|
|
max = 50;
|
|
if (len > max)
|
|
name += len - max;
|
|
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;
|
|
|
|
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);
|
|
}
|
|
|
|
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)
|
|
{
|
|
unsigned long start;
|
|
|
|
if (fragsize > size)
|
|
return -1;
|
|
|
|
start = 0;
|
|
if (line > 1) {
|
|
line--;
|
|
unsigned long offset = 0;
|
|
while (start + offset <= size) {
|
|
if (buf[offset++] == '\n') {
|
|
start = offset;
|
|
if (!--line)
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Exact line number? */
|
|
if (!memcmp(buf + start, fragment, fragsize))
|
|
return start;
|
|
|
|
/*
|
|
* We should start searching forward and backward.
|
|
*/
|
|
return -1;
|
|
}
|
|
|
|
static int apply_one_fragment(char *buf, unsigned long *sizep, unsigned long *bufsizep, struct fragment *frag)
|
|
{
|
|
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 '+':
|
|
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, *sizep, old, oldsize, frag->newpos);
|
|
if (offset >= 0) {
|
|
printf("found at offset %d\n", offset);
|
|
offset = 0;
|
|
}
|
|
|
|
free(old);
|
|
free(new);
|
|
return offset;
|
|
}
|
|
|
|
static int apply_fragments(char *buf, unsigned long *sizep, unsigned long *bufsizep, struct patch *patch)
|
|
{
|
|
struct fragment *frag = patch->fragments;
|
|
|
|
while (frag) {
|
|
if (apply_one_fragment(buf, sizep, bufsizep, frag) < 0)
|
|
return error("patch failed: %s:%d", patch->old_name, frag->oldpos);
|
|
frag = frag->next;
|
|
}
|
|
}
|
|
|
|
static int apply_data(struct patch *patch, struct stat *st)
|
|
{
|
|
unsigned long size, bufsize;
|
|
void *buf;
|
|
|
|
if (!patch->old_name || !patch->fragments)
|
|
return 0;
|
|
size = st->st_size;
|
|
bufsize = size + 16;
|
|
buf = xmalloc(bufsize);
|
|
if (read_old_data(st, patch->old_name, buf, bufsize) != size)
|
|
return error("read of %s failed", patch->old_name);
|
|
if (apply_fragments(buf, &size, &bufsize, patch) < 0)
|
|
return -1;
|
|
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;
|
|
|
|
if (old_name) {
|
|
int changed;
|
|
|
|
if (lstat(old_name, &st) < 0)
|
|
return error("%s: %s\n", 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);
|
|
changed = ce_match_stat(active_cache[pos], &st);
|
|
if (changed)
|
|
return error("%s: does not match index", old_name);
|
|
}
|
|
if (patch->is_new < 0)
|
|
patch->is_new = 0;
|
|
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 (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", old_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 void show_file(int c, unsigned int mode, const char *name)
|
|
{
|
|
printf("%c %o %s\n", c, mode, name);
|
|
}
|
|
|
|
static void show_file_list(struct patch *patch)
|
|
{
|
|
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);
|
|
}
|
|
}
|
|
|
|
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 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 = strlen(patch->old_name);
|
|
if (len > max_len)
|
|
max_len = len;
|
|
}
|
|
if (patch->new_name) {
|
|
int len = strlen(patch->new_name);
|
|
if (len > max_len)
|
|
max_len = len;
|
|
}
|
|
}
|
|
|
|
static int apply_patch(int fd)
|
|
{
|
|
unsigned long offset, size;
|
|
char *buffer = read_patch_file(fd, &size);
|
|
struct patch *list = NULL, **listp = &list;
|
|
|
|
if (!buffer)
|
|
return -1;
|
|
offset = 0;
|
|
while (size > 0) {
|
|
struct patch *patch;
|
|
int nr;
|
|
|
|
patch = xmalloc(sizeof(*patch));
|
|
memset(patch, 0, sizeof(*patch));
|
|
nr = parse_chunk(buffer + offset, size, patch);
|
|
if (nr < 0)
|
|
break;
|
|
patch_stats(patch);
|
|
*listp = patch;
|
|
listp = &patch->next;
|
|
offset += nr;
|
|
size -= nr;
|
|
}
|
|
|
|
if ((check || apply) && check_patch_list(list) < 0)
|
|
exit(1);
|
|
|
|
if (show_files)
|
|
show_file_list(list);
|
|
|
|
if (diffstat)
|
|
stat_patch_list(list);
|
|
|
|
free(buffer);
|
|
return 0;
|
|
}
|
|
|
|
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;
|
|
|
|
if (!strcmp(arg, "-")) {
|
|
apply_patch(0);
|
|
read_stdin = 0;
|
|
continue;
|
|
}
|
|
if (!strcmp(arg, "--no-merge")) {
|
|
merge_patch = 0;
|
|
continue;
|
|
}
|
|
if (!strcmp(arg, "--stat")) {
|
|
apply = 0;
|
|
diffstat = 1;
|
|
continue;
|
|
}
|
|
if (!strcmp(arg, "--check")) {
|
|
apply = 0;
|
|
check = 1;
|
|
continue;
|
|
}
|
|
if (!strcmp(arg, "--index")) {
|
|
check_index = 1;
|
|
continue;
|
|
}
|
|
if (!strcmp(arg, "--show-files")) {
|
|
show_files = 1;
|
|
continue;
|
|
}
|
|
fd = open(arg, O_RDONLY);
|
|
if (fd < 0)
|
|
usage(apply_usage);
|
|
read_stdin = 0;
|
|
apply_patch(fd);
|
|
close(fd);
|
|
}
|
|
if (read_stdin)
|
|
apply_patch(0);
|
|
return 0;
|
|
}
|