update-index.c
/*
* GIT - The information manager from hell
*
* Copyright (C) Linus Torvalds, 2005
*/
#include "cache.h"
#include "strbuf.h"
#include "quote.h"
/*
* Default to not allowing changes to the list of files. The
* tool doesn't actually care, but this makes it harder to add
* files to the revision control by mistake by doing something
* like "git-update-index *" and suddenly having all the object
* files be revision controlled.
*/
static int allow_add;
static int allow_remove;
static int allow_replace;
static int allow_unmerged; /* --refresh needing merge is not error */
static int not_new; /* --refresh not having working tree files is not error */
static int quiet; /* --refresh needing update is not error */
static int info_only;
static int force_remove;
static int verbose;
/* Three functions to allow overloaded pointer return; see linux/err.h */
static inline void *ERR_PTR(long error)
{
return (void *) error;
}
static inline long PTR_ERR(const void *ptr)
{
return (long) ptr;
}
static inline long IS_ERR(const void *ptr)
{
return (unsigned long)ptr > (unsigned long)-1000L;
}
static void report(const char *fmt, ...)
{
va_list vp;
if (!verbose)
return;
va_start(vp, fmt);
vprintf(fmt, vp);
putchar('\n');
va_end(vp);
}
static int add_file_to_cache(const char *path)
{
int size, namelen, option, status;
struct cache_entry *ce;
struct stat st;
status = lstat(path, &st);
if (status < 0 || S_ISDIR(st.st_mode)) {
/* When we used to have "path" and now we want to add
* "path/file", we need a way to remove "path" before
* being able to add "path/file". However,
* "git-update-index --remove path" would not work.
* --force-remove can be used but this is more user
* friendly, especially since we can do the opposite
* case just fine without --force-remove.
*/
if (status == 0 || (errno == ENOENT || errno == ENOTDIR)) {
if (allow_remove) {
if (remove_file_from_cache(path))
return error("%s: cannot remove from the index",
path);
else
return 0;
} else if (status < 0) {
return error("%s: does not exist and --remove not passed",
path);
}
}
if (0 == status)
return error("%s: is a directory - add files inside instead",
path);
else
return error("lstat(\"%s\"): %s", path,
strerror(errno));
}
namelen = strlen(path);
size = cache_entry_size(namelen);
ce = xmalloc(size);
memset(ce, 0, size);
memcpy(ce->name, path, namelen);
fill_stat_cache_info(ce, &st);
ce->ce_mode = create_ce_mode(st.st_mode);
if (!trust_executable_bit) {
/* If there is an existing entry, pick the mode bits
* from it.
*/
int pos = cache_name_pos(path, namelen);
if (0 <= pos)
ce->ce_mode = active_cache[pos]->ce_mode;
}
ce->ce_flags = htons(namelen);
if (index_path(ce->sha1, path, &st, !info_only))
return -1;
option = allow_add ? ADD_CACHE_OK_TO_ADD : 0;
option |= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0;
if (add_cache_entry(ce, option))
return error("%s: cannot add to the index - missing --add option?",
path);
return 0;
}
/*
* "refresh" does not calculate a new sha1 file or bring the
* cache up-to-date for mode/content changes. But what it
* _does_ do is to "re-match" the stat information of a file
* with the cache, so that you can refresh the cache for a
* file that hasn't been changed but where the stat entry is
* out of date.
*
* For example, you'd want to do this after doing a "git-read-tree",
* to link up the stat cache details with the proper files.
*/
static struct cache_entry *refresh_entry(struct cache_entry *ce)
{
struct stat st;
struct cache_entry *updated;
int changed, size;
if (lstat(ce->name, &st) < 0)
return ERR_PTR(-errno);
changed = ce_match_stat(ce, &st);
if (!changed)
return NULL;
if (ce_modified(ce, &st))
return ERR_PTR(-EINVAL);
size = ce_size(ce);
updated = xmalloc(size);
memcpy(updated, ce, size);
fill_stat_cache_info(updated, &st);
return updated;
}
static int refresh_cache(void)
{
int i;
int has_errors = 0;
for (i = 0; i < active_nr; i++) {
struct cache_entry *ce, *new;
ce = active_cache[i];
if (ce_stage(ce)) {
while ((i < active_nr) &&
! strcmp(active_cache[i]->name, ce->name))
i++;
i--;
if (allow_unmerged)
continue;
printf("%s: needs merge\n", ce->name);
has_errors = 1;
continue;
}
new = refresh_entry(ce);
if (!new)
continue;
if (IS_ERR(new)) {
if (not_new && PTR_ERR(new) == -ENOENT)
continue;
if (quiet)
continue;
printf("%s: needs update\n", ce->name);
has_errors = 1;
continue;
}
active_cache_changed = 1;
/* You can NOT just free active_cache[i] here, since it
* might not be necessarily malloc()ed but can also come
* from mmap(). */
active_cache[i] = new;
}
return has_errors;
}
/*
* We fundamentally don't like some paths: we don't want
* dot or dot-dot anywhere, and for obvious reasons don't
* want to recurse into ".git" either.
*
* Also, we don't want double slashes or slashes at the
* end that can make pathnames ambiguous.
*/
static int verify_dotfile(const char *rest)
{
/*
* The first character was '.', but that
* has already been discarded, we now test
* the rest.
*/
switch (*rest) {
/* "." is not allowed */
case '\0': case '/':
return 0;
/*
* ".git" followed by NUL or slash is bad. This
* shares the path end test with the ".." case.
*/
case 'g':
if (rest[1] != 'i')
break;
if (rest[2] != 't')
break;
rest += 2;
/* fallthrough */
case '.':
if (rest[1] == '\0' || rest[1] == '/')
return 0;
}
return 1;
}
static int verify_path(const char *path)
{
char c;
goto inside;
for (;;) {
if (!c)
return 1;
if (c == '/') {
inside:
c = *path++;
switch (c) {
default:
continue;
case '/': case '\0':
break;
case '.':
if (verify_dotfile(path))
continue;
}
return 0;
}
c = *path++;
}
}
static int add_cacheinfo(unsigned int mode, const unsigned char *sha1,
const char *path, int stage)
{
int size, len, option;
struct cache_entry *ce;
if (!verify_path(path))
return -1;
len = strlen(path);
size = cache_entry_size(len);
ce = xmalloc(size);
memset(ce, 0, size);
memcpy(ce->sha1, sha1, 20);
memcpy(ce->name, path, len);
ce->ce_flags = create_ce_flags(len, stage);
ce->ce_mode = create_ce_mode(mode);
option = allow_add ? ADD_CACHE_OK_TO_ADD : 0;
option |= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0;
if (add_cache_entry(ce, option))
return error("%s: cannot add to the index - missing --add option?",
path);
report("add '%s'", path);
return 0;
}
static int chmod_path(int flip, const char *path)
{
int pos;
struct cache_entry *ce;
unsigned int mode;
pos = cache_name_pos(path, strlen(path));
if (pos < 0)
return -1;
ce = active_cache[pos];
mode = ntohl(ce->ce_mode);
if (!S_ISREG(mode))
return -1;
switch (flip) {
case '+':
ce->ce_mode |= htonl(0111); break;
case '-':
ce->ce_mode &= htonl(~0111); break;
default:
return -1;
}
active_cache_changed = 1;
return 0;
}
static struct cache_file cache_file;
static void update_one(const char *path, const char *prefix, int prefix_length)
{
const char *p = prefix_path(prefix, prefix_length, path);
if (!verify_path(p)) {
fprintf(stderr, "Ignoring path %s\n", path);
return;
}
if (force_remove) {
if (remove_file_from_cache(p))
die("git-update-index: unable to remove %s", path);
report("remove '%s'", path);
return;
}
if (add_file_to_cache(p))
die("Unable to process file %s", path);
report("add '%s'", path);
}
static void read_index_info(int line_termination)
{
struct strbuf buf;
strbuf_init(&buf);
while (1) {
char *ptr, *tab;
char *path_name;
unsigned char sha1[20];
unsigned int mode;
int stage;
/* This reads lines formatted in one of three formats:
*
* (1) mode SP sha1 TAB path
* The first format is what "git-apply --index-info"
* reports, and used to reconstruct a partial tree
* that is used for phony merge base tree when falling
* back on 3-way merge.
*
* (2) mode SP type SP sha1 TAB path
* The second format is to stuff git-ls-tree output
* into the index file.
*
* (3) mode SP sha1 SP stage TAB path
* This format is to put higher order stages into the
* index file and matches git-ls-files --stage output.
*/
read_line(&buf, stdin, line_termination);
if (buf.eof)
break;
mode = strtoul(buf.buf, &ptr, 8);
if (ptr == buf.buf || *ptr != ' ')
goto bad_line;
tab = strchr(ptr, '\t');
if (!tab || tab - ptr < 41)
goto bad_line;
if (tab[-2] == ' ' && '0' <= tab[-1] && tab[-1] <= '3') {
stage = tab[-1] - '0';
ptr = tab + 1; /* point at the head of path */
tab = tab - 2; /* point at tail of sha1 */
}
else {
stage = 0;
ptr = tab + 1; /* point at the head of path */
}
if (get_sha1_hex(tab - 40, sha1) || tab[-41] != ' ')
goto bad_line;
if (line_termination && ptr[0] == '"')
path_name = unquote_c_style(ptr, NULL);
else
path_name = ptr;
if (!verify_path(path_name)) {
fprintf(stderr, "Ignoring path %s\n", path_name);
if (path_name != ptr)
free(path_name);
continue;
}
if (!mode) {
/* mode == 0 means there is no such path -- remove */
if (remove_file_from_cache(path_name))
die("git-update-index: unable to remove %s",
ptr);
}
else {
/* mode ' ' sha1 '\t' name
* ptr[-1] points at tab,
* ptr[-41] is at the beginning of sha1
*/
ptr[-42] = ptr[-1] = 0;
if (add_cacheinfo(mode, sha1, path_name, stage))
die("git-update-index: unable to update %s",
path_name);
}
if (path_name != ptr)
free(path_name);
continue;
bad_line:
die("malformed index info %s", buf.buf);
}
}
static const char update_index_usage[] =
"git-update-index [-q] [--add] [--replace] [--remove] [--unmerged] [--refresh] [--cacheinfo] [--chmod=(+|-)x] [--info-only] [--force-remove] [--stdin] [--index-info] [--ignore-missing] [-z] [--verbose] [--] <file>...";
int main(int argc, const char **argv)
{
int i, newfd, entries, has_errors = 0, line_termination = '\n';
int allow_options = 1;
int read_from_stdin = 0;
const char *prefix = setup_git_directory();
int prefix_length = prefix ? strlen(prefix) : 0;
git_config(git_default_config);
newfd = hold_index_file_for_update(&cache_file, get_index_file());
if (newfd < 0)
die("unable to create new cachefile");
entries = read_cache();
if (entries < 0)
die("cache corrupted");
for (i = 1 ; i < argc; i++) {
const char *path = argv[i];
if (allow_options && *path == '-') {
if (!strcmp(path, "--")) {
allow_options = 0;
continue;
}
if (!strcmp(path, "-q")) {
quiet = 1;
continue;
}
if (!strcmp(path, "--add")) {
allow_add = 1;
continue;
}
if (!strcmp(path, "--replace")) {
allow_replace = 1;
continue;
}
if (!strcmp(path, "--remove")) {
allow_remove = 1;
continue;
}
if (!strcmp(path, "--unmerged")) {
allow_unmerged = 1;
continue;
}
if (!strcmp(path, "--refresh")) {
has_errors |= refresh_cache();
continue;
}
if (!strcmp(path, "--cacheinfo")) {
unsigned char sha1[20];
unsigned int mode;
if (i+3 >= argc)
die("git-update-index: --cacheinfo <mode> <sha1> <path>");
if ((sscanf(argv[i+1], "%o", &mode) != 1) ||
get_sha1_hex(argv[i+2], sha1) ||
add_cacheinfo(mode, sha1, argv[i+3], 0))
die("git-update-index: --cacheinfo"
" cannot add %s", argv[i+3]);
i += 3;
continue;
}
if (!strcmp(path, "--chmod=-x") ||
!strcmp(path, "--chmod=+x")) {
if (argc <= i+1)
die("git-update-index: %s <path>", path);
if (chmod_path(path[8], argv[++i]))
die("git-update-index: %s cannot chmod %s", path, argv[i]);
continue;
}
if (!strcmp(path, "--info-only")) {
info_only = 1;
continue;
}
if (!strcmp(path, "--force-remove")) {
force_remove = 1;
continue;
}
if (!strcmp(path, "-z")) {
line_termination = 0;
continue;
}
if (!strcmp(path, "--stdin")) {
if (i != argc - 1)
die("--stdin must be at the end");
read_from_stdin = 1;
break;
}
if (!strcmp(path, "--index-info")) {
allow_add = allow_replace = allow_remove = 1;
read_index_info(line_termination);
continue;
}
if (!strcmp(path, "--ignore-missing")) {
not_new = 1;
continue;
}
if (!strcmp(path, "--verbose")) {
verbose = 1;
continue;
}
if (!strcmp(path, "-h") || !strcmp(path, "--help"))
usage(update_index_usage);
die("unknown option %s", path);
}
update_one(path, prefix, prefix_length);
}
if (read_from_stdin) {
struct strbuf buf;
strbuf_init(&buf);
while (1) {
char *path_name;
read_line(&buf, stdin, line_termination);
if (buf.eof)
break;
if (line_termination && buf.buf[0] == '"')
path_name = unquote_c_style(buf.buf, NULL);
else
path_name = buf.buf;
update_one(path_name, prefix, prefix_length);
if (path_name != buf.buf)
free(path_name);
}
}
if (active_cache_changed) {
if (write_cache(newfd, active_cache, active_nr) ||
commit_index_file(&cache_file))
die("Unable to write new cachefile");
}
return has_errors ? 1 : 0;
}
