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Revision 8464010f974245b1e392d34ddbfb914fcf3d8c23 authored by David Steven Tweed on 07 February 2008, 02:55:14 UTC, committed by Junio C Hamano on 11 February 2008, 20:22:58 UTC 
Make git prune remove temporary packs that look like write failures
 
Write errors when repacking (eg, due to out-of-space conditions)
can leave temporary packs (and possibly other files beginning
with "tmp_") lying around which no existing
codepath removes and which aren't obvious to the casual user.
These can also be multi-megabyte files wasting noticeable space.
Unfortunately there's no way to definitely tell in builtin-prune
that a tmp_ file is not being used by a concurrent process,
such as a fetch. However, it is documented that pruning should
only be done on a quiet repository and --expire is honoured
(using code from Johannes Schindelin, along with a test case
he wrote) so that its safety is the same as that of loose
object pruning.

Since they might be signs of a problem (unlike orphaned loose
objects) the names of any removed files are printed.

Signed-off-by: David Tweed (david.tweed@gmail.com)
Acked-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
1 parent 65ae89b
Raw File
object-refs.c 
#include "cache.h"
#include "object.h"
#include "decorate.h"

int track_object_refs = 0;

static struct decoration ref_decorate;

struct object_refs *lookup_object_refs(struct object *base)
{
	return lookup_decoration(&ref_decorate, base);
}

static void add_object_refs(struct object *obj, struct object_refs *refs)
{
	if (add_decoration(&ref_decorate, obj, refs))
		die("object %s tried to add refs twice!", sha1_to_hex(obj->sha1));
}

struct object_refs *alloc_object_refs(unsigned count)
{
	struct object_refs *refs;
	size_t size = sizeof(*refs) + count*sizeof(struct object *);

	refs = xcalloc(1, size);
	refs->count = count;
	return refs;
}

static int compare_object_pointers(const void *a, const void *b)
{
	const struct object * const *pa = a;
	const struct object * const *pb = b;
	if (*pa == *pb)
		return 0;
	else if (*pa < *pb)
		return -1;
	else
		return 1;
}

void set_object_refs(struct object *obj, struct object_refs *refs)
{
	unsigned int i, j;

	/* Do not install empty list of references */
	if (refs->count < 1) {
		free(refs);
		return;
	}

	/* Sort the list and filter out duplicates */
	qsort(refs->ref, refs->count, sizeof(refs->ref[0]),
	      compare_object_pointers);
	for (i = j = 1; i < refs->count; i++) {
		if (refs->ref[i] != refs->ref[i - 1])
			refs->ref[j++] = refs->ref[i];
	}
	if (j < refs->count) {
		/* Duplicates were found - reallocate list */
		size_t size = sizeof(*refs) + j*sizeof(struct object *);
		refs->count = j;
		refs = xrealloc(refs, size);
	}

	for (i = 0; i < refs->count; i++)
		refs->ref[i]->used = 1;
	add_object_refs(obj, refs);
}

void mark_reachable(struct object *obj, unsigned int mask)
{
	const struct object_refs *refs;

	if (!track_object_refs)
		die("cannot do reachability with object refs turned off");
	/* If we've been here already, don't bother */
	if (obj->flags & mask)
		return;
	obj->flags |= mask;
	refs = lookup_object_refs(obj);
	if (refs) {
		unsigned i;
		for (i = 0; i < refs->count; i++)
			mark_reachable(refs->ref[i], mask);
	}
}
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