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