X-Git-Url: https://git.octo.it/?a=blobdiff_plain;f=pack-objects.c;h=4e941e7392077dca9b511282be13e2b559589e5b;hb=c4c86f07d01bc4a05126b129f644e70dd9e244d0;hp=feee5600b9c362ad1436db64e3624f646f064fc3;hpb=9d5ab9625ddb53a68a99516225d0bcb39ec473d5;p=git.git

diff --git a/pack-objects.c b/pack-objects.c
index feee5600..4e941e73 100644
--- a/pack-objects.c
+++ b/pack-objects.c
@@ -1,11 +1,10 @@
-#include <ctype.h>
 #include "cache.h"
 #include "object.h"
 #include "delta.h"
 #include "pack.h"
 #include "csum-file.h"
 
-static const char pack_usage[] = "git-pack-objects [--window=N] [--depth=N] {--stdout | base-name} < object-list";
+static const char pack_usage[] = "git-pack-objects [--local] [--incremental] [--window=N] [--depth=N] {--stdout | base-name} < object-list";
 
 struct object_entry {
 	unsigned char sha1[20];
@@ -18,6 +17,10 @@ struct object_entry {
 	struct object_entry *delta;
 };
 
+static unsigned char object_list_sha1[20];
+static int non_empty = 0;
+static int local = 0;
+static int incremental = 0;
 static struct object_entry **sorted_by_sha, **sorted_by_type;
 static struct object_entry *objects = NULL;
 static int nr_objects = 0, nr_alloc = 0;
@@ -34,7 +37,7 @@ static void *delta_against(void *buf, unsigned long size, struct object_entry *e
 	if (!otherbuf)
 		die("unable to read %s", sha1_to_hex(entry->delta->sha1));
         delta_buf = diff_delta(otherbuf, othersize,
-			       buf, size, &delta_size, ~0UL);
+			       buf, size, &delta_size, 0);
         if (!delta_buf || delta_size != entry->delta_size)
         	die("delta size changed");
         free(buf);
@@ -51,32 +54,19 @@ static void *delta_against(void *buf, unsigned long size, struct object_entry *e
  */
 static int encode_header(enum object_type type, unsigned long size, unsigned char *hdr)
 {
-	int n = 1, i;
+	int n = 1;
 	unsigned char c;
 
 	if (type < OBJ_COMMIT || type > OBJ_DELTA)
 		die("bad type %d", type);
 
-	/*
-	 * Shift the size up by 7 bits at a time,
-	 * until you get bits in the "high four".
-	 * That will be our beginning. We'll have
-	 * four size bits in 28..31, then groups
-	 * of seven in 21..27, 14..20, 7..13 and
-	 * finally 0..6.
-	 */
-	if (size) {
-		n = 5;
-		while (!(size & 0xfe000000)) {
-			size <<= 7;
-			n--;
-		}
-	}
-	c = (type << 4) | (size >> 28);
-	for (i = 1; i < n; i++) {
+	c = (type << 4) | (size & 15);
+	size >>= 4;
+	while (size) {
 		*hdr++ = c | 0x80;
-		c = (size >> 21) & 0x7f;
-		size <<= 7;
+		c = size & 0x7f;
+		size >>= 7;
+		n++;
 	}
 	*hdr = c;
 	return n;
@@ -146,9 +136,9 @@ static void write_pack_file(void)
 	if (!base_name)
 		f = sha1fd(1, "<stdout>");
 	else
-		f = sha1create("%s.%s", base_name, "pack");
+		f = sha1create("%s-%s.%s", base_name, sha1_to_hex(object_list_sha1), "pack");
 	hdr.hdr_signature = htonl(PACK_SIGNATURE);
-	hdr.hdr_version = htonl(1);
+	hdr.hdr_version = htonl(PACK_VERSION);
 	hdr.hdr_entries = htonl(nr_objects);
 	sha1write(f, &hdr, sizeof(hdr));
 	offset = sizeof(hdr);
@@ -163,7 +153,7 @@ static void write_pack_file(void)
 static void write_index_file(void)
 {
 	int i;
-	struct sha1file *f = sha1create("%s.%s", base_name, "idx");
+	struct sha1file *f = sha1create("%s-%s.%s", base_name, sha1_to_hex(object_list_sha1), "idx");
 	struct object_entry **list = sorted_by_sha;
 	struct object_entry **last = list + nr_objects;
 	unsigned int array[256];
@@ -200,11 +190,26 @@ static void write_index_file(void)
 	sha1close(f, NULL, 1);
 }
 
-static void add_object_entry(unsigned char *sha1, unsigned int hash)
+static int add_object_entry(unsigned char *sha1, unsigned int hash)
 {
 	unsigned int idx = nr_objects;
 	struct object_entry *entry;
 
+	if (incremental || local) {
+		struct packed_git *p;
+
+		for (p = packed_git; p; p = p->next) {
+			struct pack_entry e;
+
+			if (find_pack_entry_one(sha1, &e, p)) {
+				if (incremental)
+					return 0;
+				if (local && !p->pack_local)
+					return 0;
+			}
+		}
+	}
+
 	if (idx >= nr_alloc) {
 		unsigned int needed = (idx + 1024) * 3 / 2;
 		objects = xrealloc(objects, needed * sizeof(*entry));
@@ -215,6 +220,7 @@ static void add_object_entry(unsigned char *sha1, unsigned int hash)
 	memcpy(entry->sha1, sha1, 20);
 	entry->hash = hash;
 	nr_objects = idx+1;
+	return 1;
 }
 
 static void check_object(struct object_entry *entry)
@@ -388,18 +394,101 @@ static void find_deltas(struct object_entry **list, int window, int depth)
 		if (idx >= window)
 			idx = 0;
 	}
+
+	for (i = 0; i < window; ++i)
+		free(array[i].data);
+	free(array);
+}
+
+static void prepare_pack(int window, int depth)
+{
+	get_object_details();
+
+	fprintf(stderr, "Packing %d objects\n", nr_objects);
+
+	sorted_by_type = create_sorted_list(type_size_sort);
+	if (window && depth)
+		find_deltas(sorted_by_type, window+1, depth);
+	write_pack_file();
+}
+
+static int reuse_cached_pack(unsigned char *sha1, int pack_to_stdout)
+{
+	static const char cache[] = "pack-cache/pack-%s.%s";
+	char *cached_pack, *cached_idx;
+	int ifd, ofd, ifd_ix = -1;
+
+	cached_pack = git_path(cache, sha1_to_hex(sha1), "pack");
+	ifd = open(cached_pack, O_RDONLY);
+	if (ifd < 0)
+		return 0;
+
+	if (!pack_to_stdout) {
+		cached_idx = git_path(cache, sha1_to_hex(sha1), "idx");
+		ifd_ix = open(cached_idx, O_RDONLY);
+		if (ifd_ix < 0) {
+			close(ifd);
+			return 0;
+		}
+	}
+
+	fprintf(stderr, "Reusing %d objects pack %s\n", nr_objects,
+		sha1_to_hex(sha1));
+
+	if (pack_to_stdout) {
+		if (copy_fd(ifd, 1))
+			exit(1);
+		close(ifd);
+	}
+	else {
+		char name[PATH_MAX];
+		snprintf(name, sizeof(name),
+			 "%s-%s.%s", base_name, sha1_to_hex(sha1), "pack");
+		ofd = open(name, O_CREAT | O_EXCL | O_WRONLY, 0666);
+		if (ofd < 0)
+			die("unable to open %s (%s)", name, strerror(errno));
+		if (copy_fd(ifd, ofd))
+			exit(1);
+		close(ifd);
+
+		snprintf(name, sizeof(name),
+			 "%s-%s.%s", base_name, sha1_to_hex(sha1), "idx");
+		ofd = open(name, O_CREAT | O_EXCL | O_WRONLY, 0666);
+		if (ofd < 0)
+			die("unable to open %s (%s)", name, strerror(errno));
+		if (copy_fd(ifd_ix, ofd))
+			exit(1);
+		close(ifd_ix);
+		puts(sha1_to_hex(sha1));
+	}
+
+	return 1;
 }
 
 int main(int argc, char **argv)
 {
+	SHA_CTX ctx;
 	char line[PATH_MAX + 20];
 	int window = 10, depth = 10, pack_to_stdout = 0;
+	struct object_entry **list;
 	int i;
 
 	for (i = 1; i < argc; i++) {
 		const char *arg = argv[i];
 
 		if (*arg == '-') {
+			if (!strcmp("--non-empty", arg)) {
+				non_empty = 1;
+				continue;
+			}
+			if (!strcmp("--local", arg)) {
+				local = 1;
+				continue;
+			}
+			if (!strcmp("--incremental", arg)) {
+				incremental = 1;
+				continue;
+			}
 			if (!strncmp("--window=", arg, 9)) {
 				char *end;
 				window = strtoul(arg+9, &end, 0);
@@ -428,6 +517,7 @@ int main(int argc, char **argv)
 	if (pack_to_stdout != !base_name)
 		usage(pack_usage);
 
+	prepare_packed_git();
 	while (fgets(line, sizeof(line), stdin) != NULL) {
 		unsigned int hash;
 		char *p;
@@ -445,17 +535,26 @@ int main(int argc, char **argv)
 		}
 		add_object_entry(sha1, hash);
 	}
-	get_object_details();
-
-	fprintf(stderr, "Packing %d objects\n", nr_objects);
+	if (non_empty && !nr_objects)
+		return 0;
 
 	sorted_by_sha = create_sorted_list(sha1_sort);
-	sorted_by_type = create_sorted_list(type_size_sort);
-	if (window && depth)
-		find_deltas(sorted_by_type, window+1, depth);
-
-	write_pack_file();
-	if (!pack_to_stdout)
-		write_index_file();
+	SHA1_Init(&ctx);
+	list = sorted_by_sha;
+	for (i = 0; i < nr_objects; i++) {
+		struct object_entry *entry = *list++;
+		SHA1_Update(&ctx, entry->sha1, 20);
+	}
+	SHA1_Final(object_list_sha1, &ctx);
+
+	if (reuse_cached_pack(object_list_sha1, pack_to_stdout))
+		;
+	else {
+		prepare_pack(window, depth);
+		if (!pack_to_stdout) {
+			write_index_file();
+			puts(sha1_to_hex(object_list_sha1));
+		}
+	}
 	return 0;
 }