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tag: v1.5.6-rc2
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/*
* "diff --no-index" support
* Copyright (c) 2007 by Johannes Schindelin
* Copyright (c) 2008 by Junio C Hamano
*/

#include "cache.h"
#include "color.h"
#include "commit.h"
#include "blob.h"
#include "tag.h"
#include "diff.h"
#include "diffcore.h"
#include "revision.h"
#include "log-tree.h"
#include "builtin.h"
#include "path-list.h"

static int read_directory(const char *path, struct path_list *list)
{
DIR *dir;
struct dirent *e;

if (!(dir = opendir(path)))
return error("Could not open directory %s", path);

while ((e = readdir(dir)))
if (strcmp(".", e->d_name) && strcmp("..", e->d_name))
path_list_insert(e->d_name, list);

closedir(dir);
return 0;
}

static int get_mode(const char *path, int *mode)
{
struct stat st;

if (!path || !strcmp(path, "/dev/null"))
*mode = 0;
else if (!strcmp(path, "-"))
*mode = create_ce_mode(0666);
else if (stat(path, &st))
return error("Could not access '%s'", path);
else
*mode = st.st_mode;
return 0;
}

static int queue_diff(struct diff_options *o,
const char *name1, const char *name2)
{
int mode1 = 0, mode2 = 0;

if (get_mode(name1, &mode1) || get_mode(name2, &mode2))
return -1;

if (mode1 && mode2 && S_ISDIR(mode1) != S_ISDIR(mode2))
return error("file/directory conflict: %s, %s", name1, name2);

if (S_ISDIR(mode1) || S_ISDIR(mode2)) {
char buffer1[PATH_MAX], buffer2[PATH_MAX];
struct path_list p1 = {NULL, 0, 0, 1}, p2 = {NULL, 0, 0, 1};
int len1 = 0, len2 = 0, i1, i2, ret = 0;

if (name1 && read_directory(name1, &p1))
return -1;
if (name2 && read_directory(name2, &p2)) {
path_list_clear(&p1, 0);
return -1;
}

if (name1) {
len1 = strlen(name1);
if (len1 > 0 && name1[len1 - 1] == '/')
len1--;
memcpy(buffer1, name1, len1);
buffer1[len1++] = '/';
}

if (name2) {
len2 = strlen(name2);
if (len2 > 0 && name2[len2 - 1] == '/')
len2--;
memcpy(buffer2, name2, len2);
buffer2[len2++] = '/';
}

for (i1 = i2 = 0; !ret && (i1 < p1.nr || i2 < p2.nr); ) {
const char *n1, *n2;
int comp;

if (i1 == p1.nr)
comp = 1;
else if (i2 == p2.nr)
comp = -1;
else
comp = strcmp(p1.items[i1].path,
p2.items[i2].path);

if (comp > 0)
n1 = NULL;
else {
n1 = buffer1;
strncpy(buffer1 + len1, p1.items[i1++].path,
PATH_MAX - len1);
}

if (comp < 0)
n2 = NULL;
else {
n2 = buffer2;
strncpy(buffer2 + len2, p2.items[i2++].path,
PATH_MAX - len2);
}

ret = queue_diff(o, n1, n2);
}
path_list_clear(&p1, 0);
path_list_clear(&p2, 0);

return ret;
} else {
struct diff_filespec *d1, *d2;

if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
unsigned tmp;
const char *tmp_c;
tmp = mode1; mode1 = mode2; mode2 = tmp;
tmp_c = name1; name1 = name2; name2 = tmp_c;
}

if (!name1)
name1 = "/dev/null";
if (!name2)
name2 = "/dev/null";
d1 = alloc_filespec(name1);
d2 = alloc_filespec(name2);
fill_filespec(d1, null_sha1, mode1);
fill_filespec(d2, null_sha1, mode2);

diff_queue(&diff_queued_diff, d1, d2);
return 0;
}
}

static int path_outside_repo(const char *path)
{
/*
* We have already done setup_git_directory_gently() so we
* know we are inside a git work tree already.
*/
const char *work_tree;
size_t len;

if (!is_absolute_path(path))
return 0;
work_tree = get_git_work_tree();
len = strlen(work_tree);
if (strncmp(path, work_tree, len) ||
(path[len] != '\0' && path[len] != '/'))
return 1;
return 0;
}

void diff_no_index(struct rev_info *revs,
int argc, const char **argv,
int nongit, const char *prefix)
{
int i;
int no_index = 0;
unsigned options = 0;

/* Were we asked to do --no-index explicitly? */
for (i = 1; i < argc; i++) {
if (!strcmp(argv[i], "--"))
return;
if (!strcmp(argv[i], "--no-index"))
no_index = 1;
if (argv[i][0] != '-')
break;
}

if (!no_index && !nongit) {
/*
* Inside a git repository, without --no-index. Only
* when a path outside the repository is given,
* e.g. "git diff /var/tmp/[12]", or "git diff
* Makefile /var/tmp/Makefile", allow it to be used as
* a colourful "diff" replacement.
*/
if ((argc != i + 2) ||
(!path_outside_repo(argv[i]) &&
!path_outside_repo(argv[i+1])))
return;
}
if (argc != i + 2)
die("git diff %s takes two paths",
no_index ? "--no-index" : "[--no-index]");

/*
* If the user asked for our exit code then don't start a
* pager or we would end up reporting its exit code instead.
*/
if (!DIFF_OPT_TST(&revs->diffopt, EXIT_WITH_STATUS))
setup_pager();

diff_setup(&revs->diffopt);
if (!revs->diffopt.output_format)
revs->diffopt.output_format = DIFF_FORMAT_PATCH;
for (i = 1; i < argc - 2; ) {
int j;
if (!strcmp(argv[i], "--no-index"))
i++;
else if (!strcmp(argv[1], "-q"))
options |= DIFF_SILENT_ON_REMOVED;
else {
j = diff_opt_parse(&revs->diffopt, argv + i, argc - i);
if (!j)
die("invalid diff option/value: %s", argv[i]);
i += j;
}
}

if (prefix) {
int len = strlen(prefix);

revs->diffopt.paths = xcalloc(2, sizeof(char*));
for (i = 0; i < 2; i++) {
const char *p = argv[argc - 2 + i];
/*
* stdin should be spelled as '-'; if you have
* path that is '-', spell it as ./-.
*/
p = (strcmp(p, "-")
? xstrdup(prefix_filename(prefix, len, p))
: p);
revs->diffopt.paths[i] = p;
}
}
else
revs->diffopt.paths = argv + argc - 2;
revs->diffopt.nr_paths = 2;

DIFF_OPT_SET(&revs->diffopt, EXIT_WITH_STATUS);
DIFF_OPT_SET(&revs->diffopt, NO_INDEX);

revs->max_count = -2;
if (diff_setup_done(&revs->diffopt) < 0)
die("diff_setup_done failed");

if (queue_diff(&revs->diffopt, revs->diffopt.paths[0],
revs->diffopt.paths[1]))
exit(1);
diffcore_std(&revs->diffopt);
diff_flush(&revs->diffopt);

/*
* The return code for --no-index imitates diff(1):
* 0 = no changes, 1 = changes, else error
*/
exit(revs->diffopt.found_changes);
}
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