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/*
* GIT - The information manager from hell
*
* Copyright (C) Linus Torvalds, 2005
*/
#include "cache.h"
static int check_valid_sha1(unsigned char *sha1)
{
char *filename = sha1_file_name(sha1);
int ret;
/* If we were anal, we'd check that the sha1 of the contents actually matches */
ret = access(filename, R_OK);
if (ret)
perror(filename);
return ret;
}
static int prepend_integer(char *buffer, unsigned val, int i)
{
buffer[--i] = '\0';
do {
buffer[--i] = '0' + (val % 10);
val /= 10;
} while (val);
return i;
}
#define ORIG_OFFSET (40) /* Enough space to add the header of "tree <size>\0" */
static int write_tree(struct cache_entry **cachep, int maxentries, const char *base, int baselen, unsigned char *returnsha1)
{
unsigned char subdir_sha1[20];
unsigned long size, offset;
char *buffer;
int i, nr;
/* Guess at some random initial size */
size = 8192;
buffer = malloc(size);
offset = ORIG_OFFSET;
nr = 0;
do {
struct cache_entry *ce = cachep[nr];
const char *pathname = ce->name, *filename, *dirname;
int pathlen = ce_namelen(ce), entrylen;
unsigned char *sha1;
unsigned int mode;
/* Did we hit the end of the directory? Return how many we wrote */
if (baselen >= pathlen || memcmp(base, pathname, baselen))
break;
sha1 = ce->sha1;
mode = ntohl(ce->ce_mode);
/* Do we have _further_ subdirectories? */
filename = pathname + baselen;
dirname = strchr(filename, '/');
if (dirname) {
int subdir_written;
subdir_written = write_tree(cachep + nr, maxentries - nr, pathname, dirname-pathname+1, subdir_sha1);
nr += subdir_written;
/* Now we need to write out the directory entry into this tree.. */
mode = S_IFDIR;
pathlen = dirname - pathname;
/* ..but the directory entry doesn't count towards the total count */
nr--;
sha1 = subdir_sha1;
}
if (check_valid_sha1(sha1) < 0)
exit(1);
entrylen = pathlen - baselen;
if (offset + entrylen + 100 > size) {
size = alloc_nr(offset + entrylen + 100);
buffer = realloc(buffer, size);
}
offset += sprintf(buffer + offset, "%o %.*s", mode, entrylen, filename);
buffer[offset++] = 0;
memcpy(buffer + offset, sha1, 20);
offset += 20;
nr++;
} while (nr < maxentries);
i = prepend_integer(buffer, offset - ORIG_OFFSET, ORIG_OFFSET);
i -= 5;
memcpy(buffer+i, "tree ", 5);
buffer += i;
offset -= i;
write_sha1_file(buffer, offset, returnsha1);
return nr;
}
int main(int argc, char **argv)
{
int entries = read_cache();
unsigned char sha1[20];
if (entries <= 0)
die("write-tree: no cache contents to write");
if (write_tree(active_cache, entries, "", 0, sha1) != entries)
die("write-tree: internal error");
printf("%s\n", sha1_to_hex(sha1));
return 0;
}
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