mirror of
https://github.com/git/git.git
synced 2024-11-01 06:47:52 +01:00
812666c8e6
Introduce xmalloc and xrealloc to die gracefully with a descriptive message when out of memory, rather than taking a SIGSEGV. Signed-off-by: Christopher Li<chrislgit@chrisli.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
114 lines
2.7 KiB
C
114 lines
2.7 KiB
C
/*
|
|
* 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 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 nr;
|
|
|
|
/* Guess at some random initial size */
|
|
size = 8192;
|
|
buffer = xmalloc(size);
|
|
offset = 0;
|
|
|
|
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 = xrealloc(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);
|
|
|
|
write_sha1_file(buffer, offset, "tree", returnsha1);
|
|
free(buffer);
|
|
return nr;
|
|
}
|
|
|
|
int main(int argc, char **argv)
|
|
{
|
|
int i, unmerged;
|
|
int entries = read_cache();
|
|
unsigned char sha1[20];
|
|
|
|
if (entries <= 0)
|
|
die("write-tree: no cache contents to write");
|
|
|
|
/* Verify that the tree is merged */
|
|
unmerged = 0;
|
|
for (i = 0; i < entries; i++) {
|
|
struct cache_entry *ce = active_cache[i];
|
|
if (ntohs(ce->ce_flags) & ~CE_NAMEMASK) {
|
|
if (++unmerged > 10) {
|
|
fprintf(stderr, "...\n");
|
|
break;
|
|
}
|
|
fprintf(stderr, "%s: unmerged (%s)\n", ce->name, sha1_to_hex(ce->sha1));
|
|
}
|
|
}
|
|
if (unmerged)
|
|
die("write-tree: not able to write tree");
|
|
|
|
/* Ok, write it out */
|
|
if (write_tree(active_cache, entries, "", 0, sha1) != entries)
|
|
die("write-tree: internal error");
|
|
printf("%s\n", sha1_to_hex(sha1));
|
|
return 0;
|
|
}
|