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81e50eabf0
Update the diff-raw format as Linus and I discussed, except that it does not use sequence of underscore '_' letters to express nonexistence. All '0' mode is used for that purpose instead. The new diff-raw format can express rename/copy, and the earlier restriction that -M and -C _must_ be used with the patch format output is no longer necessary. The patch makes -M and -C flags independent of -p flag, so you need to say git-whatchanged -M -p to get the diff/patch format. Updated are both documentations and tests. Signed-off-by: Junio C Hamano <junkio@cox.net> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
746 lines
19 KiB
C
746 lines
19 KiB
C
/*
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* Copyright (C) 2005 Junio C Hamano
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*/
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <signal.h>
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#include <limits.h>
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#include "cache.h"
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#include "diff.h"
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#include "diffcore.h"
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static const char *diff_opts = "-pu";
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static unsigned char null_sha1[20] = { 0, };
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static int reverse_diff;
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static int generate_patch;
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static int line_termination = '\n';
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static int inter_name_termination = '\t';
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static const char **pathspec;
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static int speccnt;
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static const char *external_diff(void)
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{
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static const char *external_diff_cmd = NULL;
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static int done_preparing = 0;
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if (done_preparing)
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return external_diff_cmd;
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/*
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* Default values above are meant to match the
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* Linux kernel development style. Examples of
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* alternative styles you can specify via environment
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* variables are:
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*
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* GIT_DIFF_OPTS="-c";
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*/
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if (gitenv("GIT_EXTERNAL_DIFF"))
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external_diff_cmd = gitenv("GIT_EXTERNAL_DIFF");
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/* In case external diff fails... */
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diff_opts = gitenv("GIT_DIFF_OPTS") ? : diff_opts;
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done_preparing = 1;
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return external_diff_cmd;
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}
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/* Help to copy the thing properly quoted for the shell safety.
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* any single quote is replaced with '\'', and the caller is
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* expected to enclose the result within a single quote pair.
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*
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* E.g.
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* original sq_expand result
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* name ==> name ==> 'name'
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* a b ==> a b ==> 'a b'
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* a'b ==> a'\''b ==> 'a'\''b'
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*/
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static char *sq_expand(const char *src)
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{
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static char *buf = NULL;
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int cnt, c;
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const char *cp;
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char *bp;
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/* count bytes needed to store the quoted string. */
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for (cnt = 1, cp = src; *cp; cnt++, cp++)
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if (*cp == '\'')
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cnt += 3;
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buf = xmalloc(cnt);
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bp = buf;
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while ((c = *src++)) {
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if (c != '\'')
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*bp++ = c;
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else {
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bp = strcpy(bp, "'\\''");
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bp += 4;
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}
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}
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*bp = 0;
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return buf;
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}
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static struct diff_tempfile {
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const char *name; /* filename external diff should read from */
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char hex[41];
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char mode[10];
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char tmp_path[50];
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} diff_temp[2];
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static void builtin_diff(const char *name_a,
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const char *name_b,
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struct diff_tempfile *temp,
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const char *xfrm_msg)
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{
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int i, next_at, cmd_size;
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const char *diff_cmd = "diff -L'%s%s' -L'%s%s'";
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const char *diff_arg = "'%s' '%s'||:"; /* "||:" is to return 0 */
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const char *input_name_sq[2];
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const char *path0[2];
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const char *path1[2];
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const char *name_sq[2];
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char *cmd;
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name_sq[0] = sq_expand(name_a);
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name_sq[1] = sq_expand(name_b);
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/* diff_cmd and diff_arg have 6 %s in total which makes
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* the sum of these strings 12 bytes larger than required.
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* we use 2 spaces around diff-opts, and we need to count
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* terminating NUL, so we subtract 9 here.
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*/
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cmd_size = (strlen(diff_cmd) + strlen(diff_opts) +
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strlen(diff_arg) - 9);
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for (i = 0; i < 2; i++) {
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input_name_sq[i] = sq_expand(temp[i].name);
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if (!strcmp(temp[i].name, "/dev/null")) {
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path0[i] = "/dev/null";
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path1[i] = "";
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} else {
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path0[i] = i ? "b/" : "a/";
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path1[i] = name_sq[i];
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}
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cmd_size += (strlen(path0[i]) + strlen(path1[i]) +
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strlen(input_name_sq[i]));
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}
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cmd = xmalloc(cmd_size);
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next_at = 0;
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next_at += snprintf(cmd+next_at, cmd_size-next_at,
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diff_cmd,
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path0[0], path1[0], path0[1], path1[1]);
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next_at += snprintf(cmd+next_at, cmd_size-next_at,
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" %s ", diff_opts);
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next_at += snprintf(cmd+next_at, cmd_size-next_at,
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diff_arg, input_name_sq[0], input_name_sq[1]);
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printf("diff --git a/%s b/%s\n", name_a, name_b);
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if (!path1[0][0])
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printf("new file mode %s\n", temp[1].mode);
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else if (!path1[1][0])
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printf("deleted file mode %s\n", temp[0].mode);
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else {
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if (strcmp(temp[0].mode, temp[1].mode)) {
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printf("old mode %s\n", temp[0].mode);
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printf("new mode %s\n", temp[1].mode);
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}
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if (xfrm_msg && xfrm_msg[0])
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fputs(xfrm_msg, stdout);
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if (strncmp(temp[0].mode, temp[1].mode, 3))
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/* we do not run diff between different kind
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* of objects.
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*/
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exit(0);
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}
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fflush(NULL);
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execlp("/bin/sh","sh", "-c", cmd, NULL);
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}
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struct diff_filespec *alloc_filespec(const char *path)
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{
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int namelen = strlen(path);
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struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
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spec->path = (char *)(spec + 1);
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strcpy(spec->path, path);
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spec->should_free = spec->should_munmap = 0;
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spec->xfrm_flags = 0;
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spec->size = 0;
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spec->data = 0;
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spec->mode = 0;
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memset(spec->sha1, 0, 20);
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return spec;
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}
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void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
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unsigned short mode)
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{
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if (mode) { /* just playing defensive */
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spec->mode = mode;
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memcpy(spec->sha1, sha1, 20);
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spec->sha1_valid = !!memcmp(sha1, null_sha1, 20);
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}
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}
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/*
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* Given a name and sha1 pair, if the dircache tells us the file in
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* the work tree has that object contents, return true, so that
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* prepare_temp_file() does not have to inflate and extract.
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*/
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static int work_tree_matches(const char *name, const unsigned char *sha1)
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{
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struct cache_entry *ce;
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struct stat st;
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int pos, len;
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/* We do not read the cache ourselves here, because the
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* benchmark with my previous version that always reads cache
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* shows that it makes things worse for diff-tree comparing
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* two linux-2.6 kernel trees in an already checked out work
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* tree. This is because most diff-tree comparisons deal with
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* only a small number of files, while reading the cache is
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* expensive for a large project, and its cost outweighs the
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* savings we get by not inflating the object to a temporary
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* file. Practically, this code only helps when we are used
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* by diff-cache --cached, which does read the cache before
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* calling us.
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*/
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if (!active_cache)
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return 0;
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len = strlen(name);
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pos = cache_name_pos(name, len);
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if (pos < 0)
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return 0;
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ce = active_cache[pos];
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if ((lstat(name, &st) < 0) ||
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!S_ISREG(st.st_mode) || /* careful! */
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ce_match_stat(ce, &st) ||
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memcmp(sha1, ce->sha1, 20))
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return 0;
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/* we return 1 only when we can stat, it is a regular file,
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* stat information matches, and sha1 recorded in the cache
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* matches. I.e. we know the file in the work tree really is
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* the same as the <name, sha1> pair.
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*/
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return 1;
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}
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/*
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* While doing rename detection and pickaxe operation, we may need to
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* grab the data for the blob (or file) for our own in-core comparison.
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* diff_filespec has data and size fields for this purpose.
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*/
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int diff_populate_filespec(struct diff_filespec *s)
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{
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int err = 0;
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if (!DIFF_FILE_VALID(s))
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die("internal error: asking to populate invalid file.");
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if (S_ISDIR(s->mode))
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return -1;
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if (s->data)
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return err;
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if (!s->sha1_valid ||
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work_tree_matches(s->path, s->sha1)) {
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struct stat st;
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int fd;
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if (lstat(s->path, &st) < 0) {
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if (errno == ENOENT) {
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err_empty:
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err = -1;
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empty:
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s->data = "";
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s->size = 0;
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return err;
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}
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}
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s->size = st.st_size;
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if (!s->size)
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goto empty;
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if (S_ISLNK(st.st_mode)) {
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int ret;
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s->data = xmalloc(s->size);
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s->should_free = 1;
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ret = readlink(s->path, s->data, s->size);
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if (ret < 0) {
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free(s->data);
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goto err_empty;
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}
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return 0;
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}
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fd = open(s->path, O_RDONLY);
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if (fd < 0)
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goto err_empty;
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s->data = mmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
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s->should_munmap = 1;
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close(fd);
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}
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else {
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char type[20];
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s->data = read_sha1_file(s->sha1, type, &s->size);
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s->should_free = 1;
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}
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return 0;
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}
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void diff_free_filespec_data(struct diff_filespec *s)
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{
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if (s->should_free)
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free(s->data);
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else if (s->should_munmap)
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munmap(s->data, s->size);
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s->should_free = s->should_munmap = 0;
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s->data = 0;
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}
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static void prep_temp_blob(struct diff_tempfile *temp,
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void *blob,
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unsigned long size,
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unsigned char *sha1,
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int mode)
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{
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int fd;
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strcpy(temp->tmp_path, ".diff_XXXXXX");
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fd = mkstemp(temp->tmp_path);
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if (fd < 0)
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die("unable to create temp-file");
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if (write(fd, blob, size) != size)
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die("unable to write temp-file");
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close(fd);
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temp->name = temp->tmp_path;
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strcpy(temp->hex, sha1_to_hex(sha1));
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temp->hex[40] = 0;
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sprintf(temp->mode, "%06o", mode);
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}
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static void prepare_temp_file(const char *name,
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struct diff_tempfile *temp,
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struct diff_filespec *one)
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{
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if (!DIFF_FILE_VALID(one)) {
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not_a_valid_file:
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/* A '-' entry produces this for file-2, and
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* a '+' entry produces this for file-1.
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*/
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temp->name = "/dev/null";
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strcpy(temp->hex, ".");
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strcpy(temp->mode, ".");
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return;
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}
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if (!one->sha1_valid ||
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work_tree_matches(name, one->sha1)) {
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struct stat st;
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if (lstat(name, &st) < 0) {
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if (errno == ENOENT)
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goto not_a_valid_file;
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die("stat(%s): %s", name, strerror(errno));
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}
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if (S_ISLNK(st.st_mode)) {
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int ret;
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char *buf, buf_[1024];
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buf = ((sizeof(buf_) < st.st_size) ?
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xmalloc(st.st_size) : buf_);
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ret = readlink(name, buf, st.st_size);
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if (ret < 0)
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die("readlink(%s)", name);
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prep_temp_blob(temp, buf, st.st_size,
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(one->sha1_valid ?
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one->sha1 : null_sha1),
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(one->sha1_valid ?
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one->mode : S_IFLNK));
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}
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else {
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/* we can borrow from the file in the work tree */
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temp->name = name;
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if (!one->sha1_valid)
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strcpy(temp->hex, sha1_to_hex(null_sha1));
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else
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strcpy(temp->hex, sha1_to_hex(one->sha1));
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sprintf(temp->mode, "%06o",
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S_IFREG |ce_permissions(st.st_mode));
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}
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return;
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}
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else {
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if (diff_populate_filespec(one))
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die("cannot read data blob for %s", one->path);
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prep_temp_blob(temp, one->data, one->size,
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one->sha1, one->mode);
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}
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}
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static void remove_tempfile(void)
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{
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int i;
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for (i = 0; i < 2; i++)
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if (diff_temp[i].name == diff_temp[i].tmp_path) {
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unlink(diff_temp[i].name);
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diff_temp[i].name = NULL;
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}
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}
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static void remove_tempfile_on_signal(int signo)
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{
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remove_tempfile();
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}
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static int matches_pathspec(const char *name)
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{
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int i;
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int namelen;
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if (speccnt == 0)
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return 1;
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namelen = strlen(name);
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for (i = 0; i < speccnt; i++) {
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int speclen = strlen(pathspec[i]);
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if (! strncmp(pathspec[i], name, speclen) &&
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speclen <= namelen &&
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(name[speclen] == 0 || name[speclen] == '/'))
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return 1;
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}
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return 0;
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}
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/* An external diff command takes:
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*
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* diff-cmd name infile1 infile1-sha1 infile1-mode \
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* infile2 infile2-sha1 infile2-mode [ rename-to ]
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*
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*/
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static void run_external_diff(const char *name,
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const char *other,
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struct diff_filespec *one,
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struct diff_filespec *two,
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const char *xfrm_msg)
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{
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struct diff_tempfile *temp = diff_temp;
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pid_t pid;
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int status;
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static int atexit_asked = 0;
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if (!matches_pathspec(name) && (!other || !matches_pathspec(other)))
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return;
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if (one && two) {
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prepare_temp_file(name, &temp[0], one);
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prepare_temp_file(other ? : name, &temp[1], two);
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if (! atexit_asked &&
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(temp[0].name == temp[0].tmp_path ||
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temp[1].name == temp[1].tmp_path)) {
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atexit_asked = 1;
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atexit(remove_tempfile);
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}
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signal(SIGINT, remove_tempfile_on_signal);
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}
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fflush(NULL);
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pid = fork();
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if (pid < 0)
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die("unable to fork");
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if (!pid) {
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const char *pgm = external_diff();
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if (pgm) {
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if (one && two) {
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const char *exec_arg[10];
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const char **arg = &exec_arg[0];
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*arg++ = pgm;
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*arg++ = name;
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*arg++ = temp[0].name;
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*arg++ = temp[0].hex;
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*arg++ = temp[0].mode;
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*arg++ = temp[1].name;
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*arg++ = temp[1].hex;
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*arg++ = temp[1].mode;
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if (other) {
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*arg++ = other;
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*arg++ = xfrm_msg;
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}
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*arg = 0;
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execvp(pgm, (char *const*) exec_arg);
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}
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else
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execlp(pgm, pgm, name, NULL);
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}
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/*
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* otherwise we use the built-in one.
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*/
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if (one && two)
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builtin_diff(name, other ? : name, temp, xfrm_msg);
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else
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printf("* Unmerged path %s\n", name);
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exit(0);
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}
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if (waitpid(pid, &status, 0) < 0 ||
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!WIFEXITED(status) || WEXITSTATUS(status)) {
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/* Earlier we did not check the exit status because
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* diff exits non-zero if files are different, and
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* we are not interested in knowing that. It was a
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* mistake which made it harder to quit a diff-*
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* session that uses the git-apply-patch-script as
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* the GIT_EXTERNAL_DIFF. A custom GIT_EXTERNAL_DIFF
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* should also exit non-zero only when it wants to
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* abort the entire diff-* session.
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*/
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remove_tempfile();
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fprintf(stderr, "external diff died, stopping at %s.\n", name);
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exit(1);
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}
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remove_tempfile();
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}
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int diff_scoreopt_parse(const char *opt)
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{
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int diglen, num, scale, i;
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if (opt[0] != '-' || (opt[1] != 'M' && opt[1] != 'C'))
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return -1; /* that is not a -M nor -C option */
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diglen = strspn(opt+2, "0123456789");
|
|
if (diglen == 0 || strlen(opt+2) != diglen)
|
|
return 0; /* use default */
|
|
sscanf(opt+2, "%d", &num);
|
|
for (i = 0, scale = 1; i < diglen; i++)
|
|
scale *= 10;
|
|
|
|
/* user says num divided by scale and we say internally that
|
|
* is MAX_SCORE * num / scale.
|
|
*/
|
|
return MAX_SCORE * num / scale;
|
|
}
|
|
|
|
void diff_setup(int reverse_diff_, int diff_output_style)
|
|
{
|
|
reverse_diff = reverse_diff_;
|
|
generate_patch = 0;
|
|
switch (diff_output_style) {
|
|
case DIFF_FORMAT_HUMAN:
|
|
line_termination = '\n';
|
|
inter_name_termination = '\t';
|
|
break;
|
|
case DIFF_FORMAT_MACHINE:
|
|
line_termination = inter_name_termination = 0;
|
|
break;
|
|
case DIFF_FORMAT_PATCH:
|
|
generate_patch = 1;
|
|
break;
|
|
}
|
|
}
|
|
|
|
struct diff_queue_struct diff_queued_diff;
|
|
|
|
struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
|
|
struct diff_filespec *one,
|
|
struct diff_filespec *two)
|
|
{
|
|
struct diff_filepair *dp = xmalloc(sizeof(*dp));
|
|
dp->one = one;
|
|
dp->two = two;
|
|
dp->xfrm_msg = 0;
|
|
dp->orig_order = queue->nr;
|
|
dp->xfrm_work = 0;
|
|
if (queue->alloc <= queue->nr) {
|
|
queue->alloc = alloc_nr(queue->alloc);
|
|
queue->queue = xrealloc(queue->queue,
|
|
sizeof(dp) * queue->alloc);
|
|
}
|
|
queue->queue[queue->nr++] = dp;
|
|
return dp;
|
|
}
|
|
|
|
static void diff_flush_raw(struct diff_filepair *p)
|
|
{
|
|
/*
|
|
* We used to reject rename/copy but new diff-raw can express them.
|
|
*/
|
|
printf(":%06o %06o %s ",
|
|
p->one->mode, p->two->mode, sha1_to_hex(p->one->sha1));
|
|
printf("%s%c%s%c%s%c",
|
|
sha1_to_hex(p->two->sha1), inter_name_termination,
|
|
p->one->path, inter_name_termination,
|
|
p->two->path, line_termination);
|
|
}
|
|
|
|
static void diff_flush_patch(struct diff_filepair *p)
|
|
{
|
|
const char *name, *other;
|
|
|
|
name = p->one->path;
|
|
other = (strcmp(name, p->two->path) ? p->two->path : NULL);
|
|
if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
|
|
(DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
|
|
return; /* no tree diffs in patch format */
|
|
|
|
run_external_diff(name, other, p->one, p->two, p->xfrm_msg);
|
|
}
|
|
|
|
static int identical(struct diff_filespec *one, struct diff_filespec *two)
|
|
{
|
|
/* This function is written stricter than necessary to support
|
|
* the currently implemented transformers, but the idea is to
|
|
* let transformers to produce diff_filepairs any way they want,
|
|
* and filter and clean them up here before producing the output.
|
|
*/
|
|
|
|
if (!DIFF_FILE_VALID(one) && !DIFF_FILE_VALID(two))
|
|
return 1; /* not interesting */
|
|
|
|
/* deletion, addition, mode change and renames are all interesting. */
|
|
if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
|
|
(one->mode != two->mode) ||
|
|
strcmp(one->path, two->path))
|
|
return 0;
|
|
|
|
/* both are valid and point at the same path. that is, we are
|
|
* dealing with a change.
|
|
*/
|
|
if (one->sha1_valid && two->sha1_valid &&
|
|
!memcmp(one->sha1, two->sha1, sizeof(one->sha1)))
|
|
return 1; /* no change */
|
|
if (!one->sha1_valid && !two->sha1_valid)
|
|
return 1; /* both look at the same file on the filesystem. */
|
|
return 0;
|
|
}
|
|
|
|
static void diff_flush_one(struct diff_filepair *p)
|
|
{
|
|
if (identical(p->one, p->two))
|
|
return;
|
|
if (generate_patch)
|
|
diff_flush_patch(p);
|
|
else
|
|
diff_flush_raw(p);
|
|
}
|
|
|
|
int diff_queue_is_empty(void)
|
|
{
|
|
struct diff_queue_struct *q = &diff_queued_diff;
|
|
int i;
|
|
|
|
for (i = 0; i < q->nr; i++) {
|
|
struct diff_filepair *p = q->queue[i];
|
|
if (!identical(p->one, p->two))
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
void diff_flush(const char **pathspec_, int speccnt_)
|
|
{
|
|
struct diff_queue_struct *q = &diff_queued_diff;
|
|
int i;
|
|
|
|
pathspec = pathspec_;
|
|
speccnt = speccnt_;
|
|
|
|
for (i = 0; i < q->nr; i++)
|
|
diff_flush_one(q->queue[i]);
|
|
|
|
for (i = 0; i < q->nr; i++) {
|
|
struct diff_filepair *p = q->queue[i];
|
|
diff_free_filespec_data(p->one);
|
|
diff_free_filespec_data(p->two);
|
|
free(p->xfrm_msg);
|
|
free(p);
|
|
}
|
|
free(q->queue);
|
|
q->queue = NULL;
|
|
q->nr = q->alloc = 0;
|
|
}
|
|
|
|
void diff_addremove(int addremove, unsigned mode,
|
|
const unsigned char *sha1,
|
|
const char *base, const char *path)
|
|
{
|
|
char concatpath[PATH_MAX];
|
|
struct diff_filespec *one, *two;
|
|
|
|
/* This may look odd, but it is a preparation for
|
|
* feeding "there are unchanged files which should
|
|
* not produce diffs, but when you are doing copy
|
|
* detection you would need them, so here they are"
|
|
* entries to the diff-core. They will be prefixed
|
|
* with something like '=' or '*' (I haven't decided
|
|
* which but should not make any difference).
|
|
* Feeding the same new and old to diff_change() should
|
|
* also have the same effect. diff_flush() should
|
|
* filter the identical ones out at the final output
|
|
* stage.
|
|
*/
|
|
if (reverse_diff)
|
|
addremove = (addremove == '+' ? '-' :
|
|
addremove == '-' ? '+' : addremove);
|
|
|
|
if (!path) path = "";
|
|
sprintf(concatpath, "%s%s", base, path);
|
|
one = alloc_filespec(concatpath);
|
|
two = alloc_filespec(concatpath);
|
|
|
|
if (addremove != '+')
|
|
fill_filespec(one, sha1, mode);
|
|
if (addremove != '-')
|
|
fill_filespec(two, sha1, mode);
|
|
|
|
diff_queue(&diff_queued_diff, one, two);
|
|
}
|
|
|
|
void diff_guif(unsigned old_mode,
|
|
unsigned new_mode,
|
|
const unsigned char *old_sha1,
|
|
const unsigned char *new_sha1,
|
|
const char *old_path,
|
|
const char *new_path)
|
|
{
|
|
struct diff_filespec *one, *two;
|
|
|
|
if (reverse_diff) {
|
|
unsigned tmp;
|
|
const unsigned char *tmp_c;
|
|
tmp = old_mode; old_mode = new_mode; new_mode = tmp;
|
|
tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
|
|
}
|
|
one = alloc_filespec(old_path);
|
|
two = alloc_filespec(new_path);
|
|
if (old_mode)
|
|
fill_filespec(one, old_sha1, old_mode);
|
|
if (new_mode)
|
|
fill_filespec(two, new_sha1, new_mode);
|
|
diff_queue(&diff_queued_diff, one, two);
|
|
}
|
|
|
|
void diff_change(unsigned old_mode, unsigned new_mode,
|
|
const unsigned char *old_sha1,
|
|
const unsigned char *new_sha1,
|
|
const char *base, const char *path)
|
|
{
|
|
char concatpath[PATH_MAX];
|
|
struct diff_filespec *one, *two;
|
|
|
|
if (reverse_diff) {
|
|
unsigned tmp;
|
|
const unsigned char *tmp_c;
|
|
tmp = old_mode; old_mode = new_mode; new_mode = tmp;
|
|
tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
|
|
}
|
|
if (!path) path = "";
|
|
sprintf(concatpath, "%s%s", base, path);
|
|
one = alloc_filespec(concatpath);
|
|
two = alloc_filespec(concatpath);
|
|
fill_filespec(one, old_sha1, old_mode);
|
|
fill_filespec(two, new_sha1, new_mode);
|
|
|
|
diff_queue(&diff_queued_diff, one, two);
|
|
}
|
|
|
|
void diff_unmerge(const char *path)
|
|
{
|
|
if (generate_patch)
|
|
run_external_diff(path, NULL, NULL, NULL, NULL);
|
|
else
|
|
printf("U %s%c", path, line_termination);
|
|
}
|