X-Git-Url: https://git.octo.it/?a=blobdiff_plain;f=pack-objects.c;h=7d6247791d9374986c6fb85159433ecd91b9ccec;hb=687dd75c95f9212244b6cf4fe60b40db44de01ba;hp=70fb2afeb8cfdef06b20dc7f96cd427f7c50ab60;hpb=3f9ac8d259fb919e001671c5e403e5fceaabf0d8;p=git.git

diff --git a/pack-objects.c b/pack-objects.c
index 70fb2afe..7d624779 100644
--- a/pack-objects.c
+++ b/pack-objects.c
@@ -4,21 +4,29 @@
 #include "pack.h"
 #include "csum-file.h"
 #include <sys/time.h>
+#include <signal.h>
 
-static const char pack_usage[] = "git-pack-objects [-q] [--non-empty] [--local] [--incremental] [--window=N] [--depth=N] {--stdout | base-name} < object-list";
+static const char pack_usage[] = "git-pack-objects [-q] [--no-reuse-delta] [--non-empty] [--local] [--incremental] [--window=N] [--depth=N] {--stdout | base-name} < object-list";
 
 struct object_entry {
 	unsigned char sha1[20];
 	unsigned long size;	/* uncompressed size */
-	unsigned long offset;	/* offset into the final pack file (nonzero if already written) */
+	unsigned long offset;	/* offset into the final pack file;
+				 * nonzero if already written.
+				 */
 	unsigned int depth;	/* delta depth */
+	unsigned int delta_limit;	/* base adjustment for in-pack delta */
 	unsigned int hash;	/* name hint hash */
 	enum object_type type;
+	enum object_type in_pack_type;	/* could be delta */
 	unsigned long delta_size;	/* delta data size (uncompressed) */
 	struct object_entry *delta;	/* delta base object */
 	struct packed_git *in_pack; 	/* already in pack */
-	enum object_type in_pack_type;	/* could be delta */
 	unsigned int in_pack_offset;
+	struct object_entry *delta_child; /* delitified objects who bases me */
+	struct object_entry *delta_sibling; /* other deltified objects who
+					     * uses the same base as me
+					     */
 };
 
 /*
@@ -36,6 +44,7 @@ struct object_entry {
 
 static unsigned char object_list_sha1[20];
 static int non_empty = 0;
+static int no_reuse_delta = 0;
 static int local = 0;
 static int incremental = 0;
 static struct object_entry **sorted_by_sha, **sorted_by_type;
@@ -44,6 +53,7 @@ static int nr_objects = 0, nr_alloc = 0;
 static const char *base_name;
 static unsigned char pack_file_sha1[20];
 static int progress = 1;
+static volatile sig_atomic_t progress_update = 0;
 
 /*
  * The object names in objects array are hashed with this hashtable,
@@ -75,7 +85,9 @@ static int pack_revindex_hashsz = 0;
  * stats
  */
 static int written = 0;
+static int written_delta = 0;
 static int reused = 0;
+static int reused_delta = 0;
 
 static int pack_revindex_ix(struct packed_git *p)
 {
@@ -227,10 +239,23 @@ static unsigned long write_object(struct sha1file *f, struct object_entry *entry
 	unsigned char header[10];
 	unsigned hdrlen, datalen;
 	enum object_type obj_type;
+	int to_reuse = 0;
 
 	obj_type = entry->type;
-	if (!entry->in_pack ||
-	    (obj_type != entry->in_pack_type)) {
+	if (! entry->in_pack)
+		to_reuse = 0;	/* can't reuse what we don't have */
+	else if (obj_type == OBJ_DELTA)
+		to_reuse = 1;	/* check_object() decided it for us */
+	else if (obj_type != entry->in_pack_type)
+		to_reuse = 0;	/* pack has delta which is unusable */
+	else if (entry->delta)
+		to_reuse = 0;	/* we want to pack afresh */
+	else
+		to_reuse = 1;	/* we have it in-pack undeltified,
+				 * and we do not need to deltify it.
+				 */
+
+	if (! to_reuse) {
 		buf = read_sha1_file(entry->sha1, type, &size);
 		if (!buf)
 			die("unable to read %s", sha1_to_hex(entry->sha1));
@@ -266,8 +291,12 @@ static unsigned long write_object(struct sha1file *f, struct object_entry *entry
 		sha1write(f, buf, datalen);
 		unuse_packed_git(p);
 		hdrlen = 0; /* not really */
+		if (obj_type == OBJ_DELTA)
+			reused_delta++;
 		reused++;
 	}
+	if (obj_type == OBJ_DELTA)
+		written_delta++;
 	written++;
 	return hdrlen + datalen;
 }
@@ -294,20 +323,39 @@ static void write_pack_file(void)
 	int i;
 	struct sha1file *f;
 	unsigned long offset;
-	unsigned long mb;
 	struct pack_header hdr;
+	unsigned last_percent = 999;
+	int do_progress = 0;
 
 	if (!base_name)
 		f = sha1fd(1, "<stdout>");
-	else
-		f = sha1create("%s-%s.%s", base_name, sha1_to_hex(object_list_sha1), "pack");
+	else {
+		f = sha1create("%s-%s.%s", base_name,
+			       sha1_to_hex(object_list_sha1), "pack");
+		do_progress = progress;
+	}
+	if (do_progress)
+		fprintf(stderr, "Writing %d objects.\n", nr_objects);
+
 	hdr.hdr_signature = htonl(PACK_SIGNATURE);
 	hdr.hdr_version = htonl(PACK_VERSION);
 	hdr.hdr_entries = htonl(nr_objects);
 	sha1write(f, &hdr, sizeof(hdr));
 	offset = sizeof(hdr);
-	for (i = 0; i < nr_objects; i++)
+	for (i = 0; i < nr_objects; i++) {
 		offset = write_one(f, objects + i, offset);
+		if (do_progress) {
+			unsigned percent = written * 100 / nr_objects;
+			if (progress_update || percent != last_percent) {
+				fprintf(stderr, "%4u%% (%u/%u) done\r",
+					percent, written, nr_objects);
+				progress_update = 0;
+				last_percent = percent;
+			}
+		}
+	}
+	if (do_progress)
+		fputc('\n', stderr);
 
 	sha1close(f, pack_file_sha1, 1);
 }
@@ -357,10 +405,9 @@ static int add_object_entry(unsigned char *sha1, unsigned int hash)
 	unsigned int idx = nr_objects;
 	struct object_entry *entry;
 	struct packed_git *p;
-	unsigned int found_offset;
-	struct packed_git *found_pack;
+	unsigned int found_offset = 0;
+	struct packed_git *found_pack = NULL;
 
-	found_pack = NULL;
 	for (p = packed_git; p; p = p->next) {
 		struct pack_entry e;
 		if (find_pack_entry_one(sha1, &e, p)) {
@@ -420,32 +467,40 @@ static void check_object(struct object_entry *entry)
 	char type[20];
 
 	if (entry->in_pack) {
+		unsigned char base[20];
+		unsigned long size;
+		struct object_entry *base_entry;
+
+		/* We want in_pack_type even if we do not reuse delta.
+		 * There is no point not reusing non-delta representations.
+		 */
+		check_reuse_pack_delta(entry->in_pack,
+				       entry->in_pack_offset,
+				       base, &size,
+				       &entry->in_pack_type);
+
 		/* Check if it is delta, and the base is also an object
 		 * we are going to pack.  If so we will reuse the existing
 		 * delta.
 		 */
-		unsigned char base[20];
-		unsigned long size;
-		struct object_entry *base_entry;
-		if (!check_reuse_pack_delta(entry->in_pack,
-					    entry->in_pack_offset,
-					    base, &size,
-					    &entry->in_pack_type) &&
+		if (!no_reuse_delta &&
+		    entry->in_pack_type == OBJ_DELTA &&
 		    (base_entry = locate_object_entry(base))) {
-			/* We do not know depth at this point, but it
-			 * does not matter.  Getting delta_chain_length
-			 * with packed_object_info_detail() is not so
-			 * expensive, so we could do that later if we
-			 * wanted to.  Calling sha1_object_info to get
-			 * the true size (and later an uncompressed
-			 * representation) of deeply deltified object
-			 * is quite expensive.
+
+			/* Depth value does not matter - find_deltas()
+			 * will never consider reused delta as the
+			 * base object to deltify other objects
+			 * against, in order to avoid circular deltas.
 			 */
-			entry->depth = 1;
-			/* uncompressed size */
+
+			/* uncompressed size of the delta data */
 			entry->size = entry->delta_size = size;
 			entry->delta = base_entry;
 			entry->type = OBJ_DELTA;
+
+			entry->delta_sibling = base_entry->delta_child;
+			base_entry->delta_child = entry;
+
 			return;
 		}
 		/* Otherwise we would do the usual */
@@ -487,15 +542,32 @@ static void hash_objects(void)
 	}
 }
 
+static unsigned int check_delta_limit(struct object_entry *me, unsigned int n)
+{
+	struct object_entry *child = me->delta_child;
+	unsigned int m = n;
+	while (child) {
+		unsigned int c = check_delta_limit(child, n + 1);
+		if (m < c)
+			m = c;
+		child = child->delta_sibling;
+	}
+	return m;
+}
+
 static void get_object_details(void)
 {
 	int i;
-	struct object_entry *entry = objects;
+	struct object_entry *entry;
 
 	hash_objects();
 	prepare_pack_ix();
-	for (i = 0; i < nr_objects; i++)
-		check_object(entry++);
+	for (i = 0, entry = objects; i < nr_objects; i++, entry++)
+		check_object(entry);
+	for (i = 0, entry = objects; i < nr_objects; i++, entry++)
+		if (!entry->delta && entry->delta_child)
+			entry->delta_limit =
+				check_delta_limit(entry, 1);
 }
 
 typedef int (*entry_sort_t)(const struct object_entry *, const struct object_entry *);
@@ -568,6 +640,16 @@ static int try_delta(struct unpacked *cur, struct unpacked *old, unsigned max_de
 	if (cur_entry->type != old_entry->type)
 		return -1;
 
+	/* If the current object is at edge, take the depth the objects
+	 * that depend on the current object into account -- otherwise
+	 * they would become too deep.
+	 */
+	if (cur_entry->delta_child) {
+		if (max_depth <= cur_entry->delta_limit)
+			return 0;
+		max_depth -= cur_entry->delta_limit;
+	}
+
 	size = cur_entry->size;
 	if (size < 50)
 		return -1;
@@ -601,17 +683,24 @@ static int try_delta(struct unpacked *cur, struct unpacked *old, unsigned max_de
 	return 0;
 }
 
+static void progress_interval(int signum)
+{
+	progress_update = 1;
+}
+
 static void find_deltas(struct object_entry **list, int window, int depth)
 {
 	int i, idx;
 	unsigned int array_size = window * sizeof(struct unpacked);
 	struct unpacked *array = xmalloc(array_size);
-	int eye_candy;
+	unsigned processed = 0;
+	unsigned last_percent = 999;
 
 	memset(array, 0, array_size);
 	i = nr_objects;
 	idx = 0;
-	eye_candy = i - (nr_objects / 20);
+	if (progress)
+		fprintf(stderr, "Deltifying %d objects.\n", nr_objects);
 
 	while (--i >= 0) {
 		struct object_entry *entry = list[i];
@@ -620,14 +709,20 @@ static void find_deltas(struct object_entry **list, int window, int depth)
 		char type[10];
 		int j;
 
-		if (progress && i <= eye_candy) {
-			eye_candy -= nr_objects / 20;
-			fputc('.', stderr);
+		processed++;
+		if (progress) {
+			unsigned percent = processed * 100 / nr_objects;
+			if (percent != last_percent || progress_update) {
+				fprintf(stderr, "%4u%% (%u/%u) done\r",
+					percent, processed, nr_objects);
+				progress_update = 0;
+				last_percent = percent;
+			}
 		}
 
 		if (entry->delta)
 			/* This happens if we decided to reuse existing
-			 * delta from a pack.
+			 * delta from a pack.  "!no_reuse_delta &&" is implied.
 			 */
 			continue;
 
@@ -636,6 +731,7 @@ static void find_deltas(struct object_entry **list, int window, int depth)
 		n->data = read_sha1_file(entry->sha1, type, &size);
 		if (size != entry->size)
 			die("object %s inconsistent object length (%lu vs %lu)", sha1_to_hex(entry->sha1), size, entry->size);
+
 		j = window;
 		while (--j > 0) {
 			unsigned int other_idx = idx + j;
@@ -653,6 +749,9 @@ static void find_deltas(struct object_entry **list, int window, int depth)
 			idx = 0;
 	}
 
+	if (progress)
+		fputc('\n', stderr);
+
 	for (i = 0; i < window; ++i)
 		free(array[i].data);
 	free(array);
@@ -660,18 +759,10 @@ static void find_deltas(struct object_entry **list, int window, int depth)
 
 static void prepare_pack(int window, int depth)
 {
-	if (progress)
-		fprintf(stderr, "Packing %d objects", nr_objects);
 	get_object_details();
-	if (progress)
-		fprintf(stderr, ".");
-
 	sorted_by_type = create_sorted_list(type_size_sort);
 	if (window && depth)
 		find_deltas(sorted_by_type, window+1, depth);
-	if (progress)
-		fputc('\n', stderr);
-	write_pack_file();
 }
 
 static int reuse_cached_pack(unsigned char *sha1, int pack_to_stdout)
@@ -694,8 +785,9 @@ static int reuse_cached_pack(unsigned char *sha1, int pack_to_stdout)
 		}
 	}
 
-	fprintf(stderr, "Reusing %d objects pack %s\n", nr_objects,
-		sha1_to_hex(sha1));
+	if (progress)
+		fprintf(stderr, "Reusing %d objects pack %s\n", nr_objects,
+			sha1_to_hex(sha1));
 
 	if (pack_to_stdout) {
 		if (copy_fd(ifd, 1))
@@ -727,6 +819,23 @@ static int reuse_cached_pack(unsigned char *sha1, int pack_to_stdout)
 	return 1;
 }
 
+static void setup_progress_signal(void)
+{
+	struct sigaction sa;
+	struct itimerval v;
+
+	memset(&sa, 0, sizeof(sa));
+	sa.sa_handler = progress_interval;
+	sigemptyset(&sa.sa_mask);
+	sa.sa_flags = SA_RESTART;
+	sigaction(SIGALRM, &sa, NULL);
+
+	v.it_interval.tv_sec = 1;
+	v.it_interval.tv_usec = 0;
+	v.it_value = v.it_interval;
+	setitimer(ITIMER_REAL, &v, NULL);
+}
+
 int main(int argc, char **argv)
 {
 	SHA_CTX ctx;
@@ -734,10 +843,6 @@ int main(int argc, char **argv)
 	int window = 10, depth = 10, pack_to_stdout = 0;
 	struct object_entry **list;
 	int i;
-	struct timeval prev_tv;
-	int eye_candy = 0;
-	int eye_candy_incr = 500;
-
 
 	setup_git_directory();
 
@@ -775,6 +880,10 @@ int main(int argc, char **argv)
 				progress = 0;
 				continue;
 			}
+			if (!strcmp("--no-reuse-delta", arg)) {
+				no_reuse_delta = 1;
+				continue;
+			}
 			if (!strcmp("--stdout", arg)) {
 				pack_to_stdout = 1;
 				continue;
@@ -790,30 +899,31 @@ int main(int argc, char **argv)
 		usage(pack_usage);
 
 	prepare_packed_git();
+
 	if (progress) {
 		fprintf(stderr, "Generating pack...\n");
-		gettimeofday(&prev_tv, NULL);
+		setup_progress_signal();
 	}
-	while (fgets(line, sizeof(line), stdin) != NULL) {
+
+	for (;;) {
 		unsigned int hash;
 		char *p;
 		unsigned char sha1[20];
 
-		if (progress && (eye_candy <= nr_objects)) {
+		if (!fgets(line, sizeof(line), stdin)) {
+			if (feof(stdin))
+				break;
+			if (!ferror(stdin))
+				die("fgets returned NULL, not EOF, not error!");
+			if (errno != EINTR)
+				die("fgets: %s", strerror(errno));
+			clearerr(stdin);
+			continue;
+		}
+
+		if (progress_update) {
 			fprintf(stderr, "Counting objects...%d\r", nr_objects);
-			if (eye_candy && (50 <= eye_candy_incr)) {
-				struct timeval tv;
-				int time_diff;
-				gettimeofday(&tv, NULL);
-				time_diff = (tv.tv_sec - prev_tv.tv_sec);
-				time_diff <<= 10;
-				time_diff += (tv.tv_usec - prev_tv.tv_usec);
-				if ((1 << 9) < time_diff)
-					eye_candy_incr += 50;
-				else if (50 < eye_candy_incr)
-					eye_candy_incr -= 50;
-			}
-			eye_candy += eye_candy_incr;
+			progress_update = 0;
 		}
 		if (get_sha1_hex(line, sha1))
 			die("expected sha1, got garbage:\n %s", line);
@@ -845,12 +955,21 @@ int main(int argc, char **argv)
 		;
 	else {
 		prepare_pack(window, depth);
+		if (progress && pack_to_stdout) {
+			/* the other end usually displays progress itself */
+			struct itimerval v = {{0,},};
+			setitimer(ITIMER_REAL, &v, NULL);
+			signal(SIGALRM, SIG_IGN );
+			progress_update = 0;
+		}
+		write_pack_file();
 		if (!pack_to_stdout) {
 			write_index_file();
 			puts(sha1_to_hex(object_list_sha1));
 		}
 	}
-	fprintf(stderr, "Total %d, written %d, reused %d\n",
-		nr_objects, written, reused);
+	if (progress)
+		fprintf(stderr, "Total %d, written %d (delta %d), reused %d (delta %d)\n",
+			nr_objects, written, written_delta, reused, reused_delta);
 	return 0;
 }