зеркало из https://github.com/microsoft/git.git
739 строки
17 KiB
C
739 строки
17 KiB
C
/*
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* Copyright (C) 2005 Junio C Hamano
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*/
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#include "cache.h"
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#include "quote.h"
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#include "commit.h"
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#include "diff.h"
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#include "diffcore.h"
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#include "revision.h"
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#include "cache-tree.h"
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#include "path-list.h"
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/*
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* diff-files
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*/
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static int read_directory(const char *path, struct path_list *list)
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{
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DIR *dir;
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struct dirent *e;
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if (!(dir = opendir(path)))
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return error("Could not open directory %s", path);
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while ((e = readdir(dir)))
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if (strcmp(".", e->d_name) && strcmp("..", e->d_name))
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path_list_insert(xstrdup(e->d_name), list);
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closedir(dir);
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return 0;
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}
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static int get_mode(const char *path, int *mode)
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{
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struct stat st;
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if (!path || !strcmp(path, "/dev/null"))
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*mode = 0;
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else if (!strcmp(path, "-"))
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*mode = ntohl(create_ce_mode(0666));
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else if (stat(path, &st))
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return error("Could not access '%s'", path);
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else
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*mode = st.st_mode;
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return 0;
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}
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static int queue_diff(struct diff_options *o,
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const char *name1, const char *name2)
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{
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int mode1 = 0, mode2 = 0;
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if (get_mode(name1, &mode1) || get_mode(name2, &mode2))
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return -1;
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if (mode1 && mode2 && S_ISDIR(mode1) != S_ISDIR(mode2))
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return error("file/directory conflict: %s, %s", name1, name2);
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if (S_ISDIR(mode1) || S_ISDIR(mode2)) {
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char buffer1[PATH_MAX], buffer2[PATH_MAX];
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struct path_list p1 = {NULL, 0, 0, 1}, p2 = {NULL, 0, 0, 1};
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int len1 = 0, len2 = 0, i1, i2, ret = 0;
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if (name1 && read_directory(name1, &p1))
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return -1;
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if (name2 && read_directory(name2, &p2)) {
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path_list_clear(&p1, 0);
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return -1;
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}
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if (name1) {
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len1 = strlen(name1);
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if (len1 > 0 && name1[len1 - 1] == '/')
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len1--;
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memcpy(buffer1, name1, len1);
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buffer1[len1++] = '/';
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}
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if (name2) {
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len2 = strlen(name2);
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if (len2 > 0 && name2[len2 - 1] == '/')
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len2--;
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memcpy(buffer2, name2, len2);
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buffer2[len2++] = '/';
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}
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for (i1 = i2 = 0; !ret && (i1 < p1.nr || i2 < p2.nr); ) {
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const char *n1, *n2;
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int comp;
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if (i1 == p1.nr)
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comp = 1;
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else if (i2 == p2.nr)
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comp = -1;
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else
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comp = strcmp(p1.items[i1].path,
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p2.items[i2].path);
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if (comp > 0)
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n1 = NULL;
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else {
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n1 = buffer1;
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strncpy(buffer1 + len1, p1.items[i1++].path,
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PATH_MAX - len1);
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}
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if (comp < 0)
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n2 = NULL;
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else {
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n2 = buffer2;
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strncpy(buffer2 + len2, p2.items[i2++].path,
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PATH_MAX - len2);
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}
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ret = queue_diff(o, n1, n2);
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}
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path_list_clear(&p1, 0);
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path_list_clear(&p2, 0);
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return ret;
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} else {
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struct diff_filespec *d1, *d2;
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if (o->reverse_diff) {
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unsigned tmp;
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const char *tmp_c;
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tmp = mode1; mode1 = mode2; mode2 = tmp;
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tmp_c = name1; name1 = name2; name2 = tmp_c;
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}
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if (!name1)
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name1 = "/dev/null";
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if (!name2)
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name2 = "/dev/null";
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d1 = alloc_filespec(name1);
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d2 = alloc_filespec(name2);
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fill_filespec(d1, null_sha1, mode1);
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fill_filespec(d2, null_sha1, mode2);
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diff_queue(&diff_queued_diff, d1, d2);
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return 0;
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}
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}
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/*
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* Does the path name a blob in the working tree, or a directory
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* in the working tree?
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*/
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static int is_in_index(const char *path)
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{
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int len, pos;
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struct cache_entry *ce;
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len = strlen(path);
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while (path[len-1] == '/')
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len--;
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if (!len)
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return 1; /* "." */
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pos = cache_name_pos(path, len);
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if (0 <= pos)
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return 1;
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pos = -1 - pos;
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while (pos < active_nr) {
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ce = active_cache[pos++];
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if (ce_namelen(ce) <= len ||
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strncmp(ce->name, path, len) ||
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(ce->name[len] > '/'))
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break; /* path cannot be a prefix */
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if (ce->name[len] == '/')
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return 1;
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}
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return 0;
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}
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static int handle_diff_files_args(struct rev_info *revs,
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int argc, const char **argv, int *silent)
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{
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*silent = 0;
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/* revs->max_count == -2 means --no-index */
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while (1 < argc && argv[1][0] == '-') {
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if (!strcmp(argv[1], "--base"))
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revs->max_count = 1;
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else if (!strcmp(argv[1], "--ours"))
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revs->max_count = 2;
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else if (!strcmp(argv[1], "--theirs"))
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revs->max_count = 3;
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else if (!strcmp(argv[1], "-n") ||
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!strcmp(argv[1], "--no-index")) {
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revs->max_count = -2;
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revs->diffopt.exit_with_status = 1;
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}
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else if (!strcmp(argv[1], "-q"))
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*silent = 1;
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else
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return error("invalid option: %s", argv[1]);
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argv++; argc--;
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}
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if (revs->max_count == -1 && revs->diffopt.nr_paths == 2) {
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/*
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* If two files are specified, and at least one is untracked,
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* default to no-index.
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*/
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read_cache();
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if (!is_in_index(revs->diffopt.paths[0]) ||
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!is_in_index(revs->diffopt.paths[1]))
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revs->max_count = -2;
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}
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/*
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* Make sure there are NO revision (i.e. pending object) parameter,
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* rev.max_count is reasonable (0 <= n <= 3),
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* there is no other revision filtering parameters.
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*/
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if (revs->pending.nr || revs->max_count > 3 ||
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revs->min_age != -1 || revs->max_age != -1)
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return error("no revision allowed with diff-files");
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if (revs->max_count == -1 &&
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(revs->diffopt.output_format & DIFF_FORMAT_PATCH))
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revs->combine_merges = revs->dense_combined_merges = 1;
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return 0;
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}
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static int is_outside_repo(const char *path, int nongit, const char *prefix)
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{
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int i;
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if (nongit || !strcmp(path, "-") || path[0] == '/')
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return 1;
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if (prefixcmp(path, "../"))
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return 0;
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if (!prefix)
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return 1;
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for (i = strlen(prefix); !prefixcmp(path, "../"); ) {
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while (i > 0 && prefix[i - 1] != '/')
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i--;
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if (--i < 0)
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return 1;
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path += 3;
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}
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return 0;
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}
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int setup_diff_no_index(struct rev_info *revs,
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int argc, const char ** argv, int nongit, const char *prefix)
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{
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int i;
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for (i = 1; i < argc; i++)
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if (argv[i][0] != '-' || argv[i][1] == '\0')
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break;
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else if (!strcmp(argv[i], "--")) {
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i++;
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break;
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} else if (i < argc - 3 && !strcmp(argv[i], "--no-index")) {
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i = argc - 3;
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revs->diffopt.exit_with_status = 1;
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break;
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}
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if (argc != i + 2 || (!is_outside_repo(argv[i + 1], nongit, prefix) &&
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!is_outside_repo(argv[i], nongit, prefix)))
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return -1;
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diff_setup(&revs->diffopt);
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for (i = 1; i < argc - 2; )
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if (!strcmp(argv[i], "--no-index"))
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i++;
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else {
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int j = diff_opt_parse(&revs->diffopt,
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argv + i, argc - i);
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if (!j)
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die("invalid diff option/value: %s", argv[i]);
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i += j;
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}
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if (prefix) {
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int len = strlen(prefix);
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revs->diffopt.paths = xcalloc(2, sizeof(char*));
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for (i = 0; i < 2; i++) {
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const char *p = argv[argc - 2 + i];
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/*
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* stdin should be spelled as '-'; if you have
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* path that is '-', spell it as ./-.
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*/
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p = (strcmp(p, "-")
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? xstrdup(prefix_filename(prefix, len, p))
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: p);
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revs->diffopt.paths[i] = p;
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}
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}
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else
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revs->diffopt.paths = argv + argc - 2;
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revs->diffopt.nr_paths = 2;
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revs->max_count = -2;
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return 0;
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}
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int run_diff_files_cmd(struct rev_info *revs, int argc, const char **argv)
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{
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int silent_on_removed;
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if (handle_diff_files_args(revs, argc, argv, &silent_on_removed))
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return -1;
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if (revs->max_count == -2) {
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if (revs->diffopt.nr_paths != 2)
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return error("need two files/directories with --no-index");
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if (queue_diff(&revs->diffopt, revs->diffopt.paths[0],
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revs->diffopt.paths[1]))
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return -1;
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diffcore_std(&revs->diffopt);
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diff_flush(&revs->diffopt);
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/*
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* The return code for --no-index imitates diff(1):
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* 0 = no changes, 1 = changes, else error
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*/
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return revs->diffopt.found_changes;
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}
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if (read_cache() < 0) {
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perror("read_cache");
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return -1;
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}
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return run_diff_files(revs, silent_on_removed);
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}
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int run_diff_files(struct rev_info *revs, int silent_on_removed)
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{
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int entries, i;
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int diff_unmerged_stage = revs->max_count;
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if (diff_unmerged_stage < 0)
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diff_unmerged_stage = 2;
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entries = active_nr;
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for (i = 0; i < entries; i++) {
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struct stat st;
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unsigned int oldmode, newmode;
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struct cache_entry *ce = active_cache[i];
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int changed;
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if (revs->diffopt.quiet && revs->diffopt.has_changes)
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break;
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if (!ce_path_match(ce, revs->prune_data))
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continue;
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if (ce_stage(ce)) {
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struct combine_diff_path *dpath;
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int num_compare_stages = 0;
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size_t path_len;
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path_len = ce_namelen(ce);
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dpath = xmalloc(combine_diff_path_size(5, path_len));
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dpath->path = (char *) &(dpath->parent[5]);
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dpath->next = NULL;
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dpath->len = path_len;
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memcpy(dpath->path, ce->name, path_len);
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dpath->path[path_len] = '\0';
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hashclr(dpath->sha1);
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memset(&(dpath->parent[0]), 0,
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sizeof(struct combine_diff_parent)*5);
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if (lstat(ce->name, &st) < 0) {
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if (errno != ENOENT && errno != ENOTDIR) {
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perror(ce->name);
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continue;
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}
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if (silent_on_removed)
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continue;
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}
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else
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dpath->mode = canon_mode(st.st_mode);
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while (i < entries) {
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struct cache_entry *nce = active_cache[i];
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int stage;
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if (strcmp(ce->name, nce->name))
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break;
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/* Stage #2 (ours) is the first parent,
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* stage #3 (theirs) is the second.
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*/
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stage = ce_stage(nce);
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if (2 <= stage) {
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int mode = ntohl(nce->ce_mode);
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num_compare_stages++;
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hashcpy(dpath->parent[stage-2].sha1, nce->sha1);
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dpath->parent[stage-2].mode =
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canon_mode(mode);
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dpath->parent[stage-2].status =
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DIFF_STATUS_MODIFIED;
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}
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/* diff against the proper unmerged stage */
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if (stage == diff_unmerged_stage)
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ce = nce;
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i++;
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}
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/*
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* Compensate for loop update
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*/
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i--;
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if (revs->combine_merges && num_compare_stages == 2) {
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show_combined_diff(dpath, 2,
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revs->dense_combined_merges,
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revs);
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free(dpath);
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continue;
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}
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free(dpath);
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dpath = NULL;
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/*
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* Show the diff for the 'ce' if we found the one
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* from the desired stage.
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*/
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diff_unmerge(&revs->diffopt, ce->name, 0, null_sha1);
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if (ce_stage(ce) != diff_unmerged_stage)
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continue;
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}
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if (lstat(ce->name, &st) < 0) {
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if (errno != ENOENT && errno != ENOTDIR) {
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perror(ce->name);
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continue;
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}
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if (silent_on_removed)
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continue;
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diff_addremove(&revs->diffopt, '-', ntohl(ce->ce_mode),
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ce->sha1, ce->name, NULL);
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continue;
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}
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changed = ce_match_stat(ce, &st, 0);
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if (!changed && !revs->diffopt.find_copies_harder)
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continue;
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oldmode = ntohl(ce->ce_mode);
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newmode = canon_mode(st.st_mode);
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if (!trust_executable_bit &&
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S_ISREG(newmode) && S_ISREG(oldmode) &&
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((newmode ^ oldmode) == 0111))
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newmode = oldmode;
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else if (!has_symlinks &&
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S_ISREG(newmode) && S_ISLNK(oldmode))
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newmode = oldmode;
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diff_change(&revs->diffopt, oldmode, newmode,
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ce->sha1, (changed ? null_sha1 : ce->sha1),
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ce->name, NULL);
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}
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diffcore_std(&revs->diffopt);
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diff_flush(&revs->diffopt);
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return 0;
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}
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/*
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* diff-index
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*/
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/* A file entry went away or appeared */
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static void diff_index_show_file(struct rev_info *revs,
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const char *prefix,
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struct cache_entry *ce,
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unsigned char *sha1, unsigned int mode)
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{
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diff_addremove(&revs->diffopt, prefix[0], ntohl(mode),
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sha1, ce->name, NULL);
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}
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static int get_stat_data(struct cache_entry *ce,
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unsigned char **sha1p,
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unsigned int *modep,
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int cached, int match_missing)
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{
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unsigned char *sha1 = ce->sha1;
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unsigned int mode = ce->ce_mode;
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if (!cached) {
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static unsigned char no_sha1[20];
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int changed;
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struct stat st;
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if (lstat(ce->name, &st) < 0) {
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if (errno == ENOENT && match_missing) {
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*sha1p = sha1;
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*modep = mode;
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return 0;
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}
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return -1;
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}
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changed = ce_match_stat(ce, &st, 0);
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if (changed) {
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mode = ce_mode_from_stat(ce, st.st_mode);
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sha1 = no_sha1;
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}
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}
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*sha1p = sha1;
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*modep = mode;
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return 0;
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}
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static void show_new_file(struct rev_info *revs,
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struct cache_entry *new,
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int cached, int match_missing)
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{
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unsigned char *sha1;
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unsigned int mode;
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/* New file in the index: it might actually be different in
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* the working copy.
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*/
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if (get_stat_data(new, &sha1, &mode, cached, match_missing) < 0)
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return;
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diff_index_show_file(revs, "+", new, sha1, mode);
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}
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static int show_modified(struct rev_info *revs,
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struct cache_entry *old,
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struct cache_entry *new,
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int report_missing,
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int cached, int match_missing)
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{
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unsigned int mode, oldmode;
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unsigned char *sha1;
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|
|
if (get_stat_data(new, &sha1, &mode, cached, match_missing) < 0) {
|
|
if (report_missing)
|
|
diff_index_show_file(revs, "-", old,
|
|
old->sha1, old->ce_mode);
|
|
return -1;
|
|
}
|
|
|
|
if (revs->combine_merges && !cached &&
|
|
(hashcmp(sha1, old->sha1) || hashcmp(old->sha1, new->sha1))) {
|
|
struct combine_diff_path *p;
|
|
int pathlen = ce_namelen(new);
|
|
|
|
p = xmalloc(combine_diff_path_size(2, pathlen));
|
|
p->path = (char *) &p->parent[2];
|
|
p->next = NULL;
|
|
p->len = pathlen;
|
|
memcpy(p->path, new->name, pathlen);
|
|
p->path[pathlen] = 0;
|
|
p->mode = ntohl(mode);
|
|
hashclr(p->sha1);
|
|
memset(p->parent, 0, 2 * sizeof(struct combine_diff_parent));
|
|
p->parent[0].status = DIFF_STATUS_MODIFIED;
|
|
p->parent[0].mode = ntohl(new->ce_mode);
|
|
hashcpy(p->parent[0].sha1, new->sha1);
|
|
p->parent[1].status = DIFF_STATUS_MODIFIED;
|
|
p->parent[1].mode = ntohl(old->ce_mode);
|
|
hashcpy(p->parent[1].sha1, old->sha1);
|
|
show_combined_diff(p, 2, revs->dense_combined_merges, revs);
|
|
free(p);
|
|
return 0;
|
|
}
|
|
|
|
oldmode = old->ce_mode;
|
|
if (mode == oldmode && !hashcmp(sha1, old->sha1) &&
|
|
!revs->diffopt.find_copies_harder)
|
|
return 0;
|
|
|
|
mode = ntohl(mode);
|
|
oldmode = ntohl(oldmode);
|
|
|
|
diff_change(&revs->diffopt, oldmode, mode,
|
|
old->sha1, sha1, old->name, NULL);
|
|
return 0;
|
|
}
|
|
|
|
static int diff_cache(struct rev_info *revs,
|
|
struct cache_entry **ac, int entries,
|
|
const char **pathspec,
|
|
int cached, int match_missing)
|
|
{
|
|
while (entries) {
|
|
struct cache_entry *ce = *ac;
|
|
int same = (entries > 1) && ce_same_name(ce, ac[1]);
|
|
|
|
if (revs->diffopt.quiet && revs->diffopt.has_changes)
|
|
break;
|
|
|
|
if (!ce_path_match(ce, pathspec))
|
|
goto skip_entry;
|
|
|
|
switch (ce_stage(ce)) {
|
|
case 0:
|
|
/* No stage 1 entry? That means it's a new file */
|
|
if (!same) {
|
|
show_new_file(revs, ce, cached, match_missing);
|
|
break;
|
|
}
|
|
/* Show difference between old and new */
|
|
show_modified(revs, ac[1], ce, 1,
|
|
cached, match_missing);
|
|
break;
|
|
case 1:
|
|
/* No stage 3 (merge) entry?
|
|
* That means it's been deleted.
|
|
*/
|
|
if (!same) {
|
|
diff_index_show_file(revs, "-", ce,
|
|
ce->sha1, ce->ce_mode);
|
|
break;
|
|
}
|
|
/* We come here with ce pointing at stage 1
|
|
* (original tree) and ac[1] pointing at stage
|
|
* 3 (unmerged). show-modified with
|
|
* report-missing set to false does not say the
|
|
* file is deleted but reports true if work
|
|
* tree does not have it, in which case we
|
|
* fall through to report the unmerged state.
|
|
* Otherwise, we show the differences between
|
|
* the original tree and the work tree.
|
|
*/
|
|
if (!cached &&
|
|
!show_modified(revs, ce, ac[1], 0,
|
|
cached, match_missing))
|
|
break;
|
|
diff_unmerge(&revs->diffopt, ce->name,
|
|
ntohl(ce->ce_mode), ce->sha1);
|
|
break;
|
|
case 3:
|
|
diff_unmerge(&revs->diffopt, ce->name,
|
|
0, null_sha1);
|
|
break;
|
|
|
|
default:
|
|
die("impossible cache entry stage");
|
|
}
|
|
|
|
skip_entry:
|
|
/*
|
|
* Ignore all the different stages for this file,
|
|
* we've handled the relevant cases now.
|
|
*/
|
|
do {
|
|
ac++;
|
|
entries--;
|
|
} while (entries && ce_same_name(ce, ac[0]));
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* This turns all merge entries into "stage 3". That guarantees that
|
|
* when we read in the new tree (into "stage 1"), we won't lose sight
|
|
* of the fact that we had unmerged entries.
|
|
*/
|
|
static void mark_merge_entries(void)
|
|
{
|
|
int i;
|
|
for (i = 0; i < active_nr; i++) {
|
|
struct cache_entry *ce = active_cache[i];
|
|
if (!ce_stage(ce))
|
|
continue;
|
|
ce->ce_flags |= htons(CE_STAGEMASK);
|
|
}
|
|
}
|
|
|
|
int run_diff_index(struct rev_info *revs, int cached)
|
|
{
|
|
int ret;
|
|
struct object *ent;
|
|
struct tree *tree;
|
|
const char *tree_name;
|
|
int match_missing = 0;
|
|
|
|
/*
|
|
* Backward compatibility wart - "diff-index -m" does
|
|
* not mean "do not ignore merges", but totally different.
|
|
*/
|
|
if (!revs->ignore_merges)
|
|
match_missing = 1;
|
|
|
|
mark_merge_entries();
|
|
|
|
ent = revs->pending.objects[0].item;
|
|
tree_name = revs->pending.objects[0].name;
|
|
tree = parse_tree_indirect(ent->sha1);
|
|
if (!tree)
|
|
return error("bad tree object %s", tree_name);
|
|
if (read_tree(tree, 1, revs->prune_data))
|
|
return error("unable to read tree object %s", tree_name);
|
|
ret = diff_cache(revs, active_cache, active_nr, revs->prune_data,
|
|
cached, match_missing);
|
|
diffcore_std(&revs->diffopt);
|
|
diff_flush(&revs->diffopt);
|
|
return ret;
|
|
}
|
|
|
|
int do_diff_cache(const unsigned char *tree_sha1, struct diff_options *opt)
|
|
{
|
|
struct tree *tree;
|
|
struct rev_info revs;
|
|
int i;
|
|
struct cache_entry **dst;
|
|
struct cache_entry *last = NULL;
|
|
|
|
/*
|
|
* This is used by git-blame to run diff-cache internally;
|
|
* it potentially needs to repeatedly run this, so we will
|
|
* start by removing the higher order entries the last round
|
|
* left behind.
|
|
*/
|
|
dst = active_cache;
|
|
for (i = 0; i < active_nr; i++) {
|
|
struct cache_entry *ce = active_cache[i];
|
|
if (ce_stage(ce)) {
|
|
if (last && !strcmp(ce->name, last->name))
|
|
continue;
|
|
cache_tree_invalidate_path(active_cache_tree,
|
|
ce->name);
|
|
last = ce;
|
|
ce->ce_mode = 0;
|
|
ce->ce_flags &= ~htons(CE_STAGEMASK);
|
|
}
|
|
*dst++ = ce;
|
|
}
|
|
active_nr = dst - active_cache;
|
|
|
|
init_revisions(&revs, NULL);
|
|
revs.prune_data = opt->paths;
|
|
tree = parse_tree_indirect(tree_sha1);
|
|
if (!tree)
|
|
die("bad tree object %s", sha1_to_hex(tree_sha1));
|
|
if (read_tree(tree, 1, opt->paths))
|
|
return error("unable to read tree %s", sha1_to_hex(tree_sha1));
|
|
return diff_cache(&revs, active_cache, active_nr, revs.prune_data,
|
|
1, 0);
|
|
}
|