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/*
* GIT - The information manager from hell
*
* Copyright (C) Linus Torvalds, 2005
*/
#include "cache.h"
static int remove_file_from_cache(char *path)
{
int pos = cache_name_pos(path, strlen(path));
if (pos < 0) {
pos = -pos-1;
active_nr--;
if (pos < active_nr)
memmove(active_cache + pos, active_cache + pos + 1, (active_nr - pos - 1) * sizeof(struct cache_entry *));
}
return 0;
}
static int add_cache_entry(struct cache_entry *ce)
{
int pos;
pos = cache_name_pos(ce->name, ce->namelen);
/* existing match? Just replace it */
if (pos < 0) {
active_cache[-pos-1] = ce;
return 0;
}
/* Make sure the array is big enough .. */
if (active_nr == active_alloc) {
active_alloc = alloc_nr(active_alloc);
active_cache = realloc(active_cache, active_alloc * sizeof(struct cache_entry *));
}
/* Add it in.. */
active_nr++;
if (active_nr > pos)
memmove(active_cache + pos + 1, active_cache + pos, (active_nr - pos - 1) * sizeof(ce));
active_cache[pos] = ce;
return 0;
}
static int index_fd(const char *path, int namelen, struct cache_entry *ce, int fd, struct stat *st)
{
z_stream stream;
int max_out_bytes = namelen + st->st_size + 200;
void *out = malloc(max_out_bytes);
void *metadata = malloc(namelen + 200);
void *in = mmap(NULL, st->st_size, PROT_READ, MAP_PRIVATE, fd, 0);
SHA_CTX c;
close(fd);
if (!out || (int)(long)in == -1)
return -1;
memset(&stream, 0, sizeof(stream));
deflateInit(&stream, Z_BEST_COMPRESSION);
/*
* ASCII size + nul byte
*/
stream.next_in = metadata;
stream.avail_in = 1+sprintf(metadata, "blob %lu", (unsigned long) st->st_size);
stream.next_out = out;
stream.avail_out = max_out_bytes;
while (deflate(&stream, 0) == Z_OK)
/* nothing */;
/*
* File content
*/
stream.next_in = in;
stream.avail_in = st->st_size;
while (deflate(&stream, Z_FINISH) == Z_OK)
/*nothing */;
deflateEnd(&stream);
SHA1_Init(&c);
SHA1_Update(&c, out, stream.total_out);
SHA1_Final(ce->sha1, &c);
return write_sha1_buffer(ce->sha1, out, stream.total_out);
}
static int add_file_to_cache(char *path)
{
int size, namelen;
struct cache_entry *ce;
struct stat st;
int fd;
fd = open(path, O_RDONLY);
if (fd < 0) {
if (errno == ENOENT)
return remove_file_from_cache(path);
return -1;
}
if (fstat(fd, &st) < 0) {
close(fd);
return -1;
}
namelen = strlen(path);
size = cache_entry_size(namelen);
ce = malloc(size);
memset(ce, 0, size);
memcpy(ce->name, path, namelen);
ce->ctime.sec = st.st_ctime;
ce->ctime.nsec = st.st_ctim.tv_nsec;
ce->mtime.sec = st.st_mtime;
ce->mtime.nsec = st.st_mtim.tv_nsec;
ce->st_dev = st.st_dev;
ce->st_ino = st.st_ino;
ce->st_mode = st.st_mode;
ce->st_uid = st.st_uid;
ce->st_gid = st.st_gid;
ce->st_size = st.st_size;
ce->namelen = namelen;
if (index_fd(path, namelen, ce, fd, &st) < 0)
return -1;
return add_cache_entry(ce);
}
static int write_cache(int newfd, struct cache_entry **cache, int entries)
{
SHA_CTX c;
struct cache_header hdr;
int i;
hdr.signature = CACHE_SIGNATURE;
hdr.version = 1;
hdr.entries = entries;
SHA1_Init(&c);
SHA1_Update(&c, &hdr, offsetof(struct cache_header, sha1));
for (i = 0; i < entries; i++) {
struct cache_entry *ce = cache[i];
int size = ce_size(ce);
SHA1_Update(&c, ce, size);
}
SHA1_Final(hdr.sha1, &c);
if (write(newfd, &hdr, sizeof(hdr)) != sizeof(hdr))
return -1;
for (i = 0; i < entries; i++) {
struct cache_entry *ce = cache[i];
int size = ce_size(ce);
if (write(newfd, ce, size) != size)
return -1;
}
return 0;
}
/*
* We fundamentally don't like some paths: we don't want
* dot or dot-dot anywhere, and in fact, we don't even want
* any other dot-files (.dircache or anything else). They
* are hidden, for chist sake.
*
* Also, we don't want double slashes or slashes at the
* end that can make pathnames ambiguous.
*/
static int verify_path(char *path)
{
char c;
goto inside;
for (;;) {
if (!c)
return 1;
if (c == '/') {
inside:
c = *path++;
if (c != '/' && c != '.' && c != '\0')
continue;
return 0;
}
c = *path++;
}
}
int main(int argc, char **argv)
{
int i, newfd, entries;
entries = read_cache();
if (entries < 0) {
perror("cache corrupted");
return -1;
}
newfd = open(".dircache/index.lock", O_RDWR | O_CREAT | O_EXCL, 0600);
if (newfd < 0) {
perror("unable to create new cachefile");
return -1;
}
for (i = 1 ; i < argc; i++) {
char *path = argv[i];
if (!verify_path(path)) {
fprintf(stderr, "Ignoring path %s\n", argv[i]);
continue;
}
if (add_file_to_cache(path)) {
fprintf(stderr, "Unable to add %s to database\n", path);
goto out;
}
}
if (!write_cache(newfd, active_cache, active_nr) && !rename(".dircache/index.lock", ".dircache/index"))
return 0;
out:
unlink(".dircache/index.lock");
return 0;
}
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