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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-07 22:13:13 (GMT)
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-07 22:13:13 (GMT)
commite83c5163316f89bfbde7d9ab23ca2e25604af290 (patch)
tree2b5bfdf7798569e0b59b16eb9602d5fa572d6038 /write-tree.c
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Initial revision of "git", the information manager from hell
Diffstat (limited to 'write-tree.c')
-rw-r--r--write-tree.c66
1 files changed, 66 insertions, 0 deletions
diff --git a/write-tree.c b/write-tree.c
new file mode 100644
index 0000000..921f981
--- /dev/null
+++ b/write-tree.c
@@ -0,0 +1,66 @@
+#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" */
+
+int main(int argc, char **argv)
+{
+ unsigned long size, offset, val;
+ int i, entries = read_cache();
+ char *buffer;
+
+ if (entries <= 0) {
+ fprintf(stderr, "No file-cache to create a tree of\n");
+ exit(1);
+ }
+
+ /* Guess at an initial size */
+ size = entries * 40 + 400;
+ buffer = malloc(size);
+ offset = ORIG_OFFSET;
+
+ for (i = 0; i < entries; i++) {
+ struct cache_entry *ce = active_cache[i];
+ if (check_valid_sha1(ce->sha1) < 0)
+ exit(1);
+ if (offset + ce->namelen + 60 > size) {
+ size = alloc_nr(offset + ce->namelen + 60);
+ buffer = realloc(buffer, size);
+ }
+ offset += sprintf(buffer + offset, "%o %s", ce->st_mode, ce->name);
+ buffer[offset++] = 0;
+ memcpy(buffer + offset, ce->sha1, 20);
+ offset += 20;
+ }
+
+ 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);
+ return 0;
+}