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https://github.com/git/git
23 January 2022, 05:21:09 UTC
Revision 0556a11a0df6b4119e01aa77dfb795561e62eb34 authored by Linus Torvalds on 30 June 2006, 18:20:33 UTC, committed by Junio C Hamano on 02 July 2006, 01:28:15 UTC 
git object hash cleanups
 
This IMNSHO cleans up the object hashing.

The hash expansion is separated out into a function of its own, the hash
array (and size) names are made more obvious, and the code is generally
made to look a bit more like the object-ref hashing.

It also gets rid of "find_object()" returning an index (or negative
position if no object is found), since that is made redundant by the
simplified object rehashing. The basic operation is now "lookup_object()"
which just returns the object itself.

There's an almost unmeasurable speed increase, but more importantly, I
think the end result is more readable.

Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>
1 parent 6631c73
Raw File
Tip revision: 0556a11a0df6b4119e01aa77dfb795561e62eb34 authored by Linus Torvalds on 30 June 2006, 18:20:33 UTC
git object hash cleanups
Tip revision: 0556a11
unpack-file.c 
#include "cache.h"
#include "blob.h"

static char *create_temp_file(unsigned char *sha1)
{
	static char path[50];
	void *buf;
	char type[100];
	unsigned long size;
	int fd;

	buf = read_sha1_file(sha1, type, &size);
	if (!buf || strcmp(type, blob_type))
		die("unable to read blob object %s", sha1_to_hex(sha1));

	strcpy(path, ".merge_file_XXXXXX");
	fd = mkstemp(path);
	if (fd < 0)
		die("unable to create temp-file");
	if (write(fd, buf, size) != size)
		die("unable to write temp-file");
	close(fd);
	return path;
}

int main(int argc, char **argv)
{
	unsigned char sha1[20];

	if (argc != 2)
		usage("git-unpack-file <sha1>");
	if (get_sha1(argv[1], sha1))
		die("Not a valid object name %s", argv[1]);

	setup_git_directory();
	git_config(git_default_config);

	puts(create_temp_file(sha1));
	return 0;
}
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