X-Git-Url: https://git.octo.it/?a=blobdiff_plain;f=read-cache.c;h=4173b4e454f2a44babedd753894f7ba65ab56880;hb=c347ea5d6fc6bae6b6ea3196013c4df7ec4406a8;hp=2ede67dbe17530e5b6dd4893430327b9121751fb;hpb=2ade9340262cb87163b5c5c270268175ff3b3c15;p=git.git

diff --git a/read-cache.c b/read-cache.c
index 2ede67db..4173b4e4 100644
--- a/read-cache.c
+++ b/read-cache.c
@@ -3,6 +3,7 @@
  *
  * Copyright (C) Linus Torvalds, 2005
  */
+#include <stdarg.h>
 #include "cache.h"
 
 const char *sha1_file_directory = NULL;
@@ -11,10 +12,38 @@ unsigned int active_nr = 0, active_alloc = 0;
 
 void usage(const char *err)
 {
-	fprintf(stderr, "read-tree: %s\n", err);
+	fprintf(stderr, "usage: %s\n", err);
 	exit(1);
 }
 
+static void report(const char *prefix, const char *err, va_list params)
+{
+	fputs(prefix, stderr);
+	vfprintf(stderr, err, params);
+	fputs("\n", stderr);
+}
+
+void die(const char *err, ...)
+{
+	va_list params;
+
+	va_start(params, err);
+	report("fatal: ", err, params);
+	va_end(params);
+	exit(1);
+}
+
+int error(const char *err, ...)
+{
+	va_list params;
+
+	va_start(params, err);
+	report("error: ", err, params);
+	va_end(params);
+	return -1;
+}
+
+
 static unsigned hexval(char c)
 {
 	if (c >= '0' && c <= '9')
@@ -26,7 +55,7 @@ static unsigned hexval(char c)
 	return ~0;
 }
 
-int get_sha1_hex(char *hex, unsigned char *sha1)
+int get_sha1_hex(const char *hex, unsigned char *sha1)
 {
 	int i;
 	for (i = 0; i < 20; i++) {
@@ -39,7 +68,7 @@ int get_sha1_hex(char *hex, unsigned char *sha1)
 	return 0;
 }
 
-char * sha1_to_hex(unsigned char *sha1)
+char * sha1_to_hex(const unsigned char *sha1)
 {
 	static char buffer[50];
 	static const char hex[] = "0123456789abcdef";
@@ -59,7 +88,7 @@ char * sha1_to_hex(unsigned char *sha1)
  * careful about using it. Do a "strdup()" if you need to save the
  * filename.
  */
-char *sha1_file_name(unsigned char *sha1)
+char *sha1_file_name(const unsigned char *sha1)
 {
 	int i;
 	static char *name, *base;
@@ -95,7 +124,7 @@ int check_sha1_signature(unsigned char *sha1, void *map, unsigned long size)
 	return memcmp(sha1, real_sha1, 20) ? -1 : 0;
 }
 
-void *map_sha1_file(unsigned char *sha1, unsigned long *size)
+void *map_sha1_file(const unsigned char *sha1, unsigned long *size)
 {
 	char *filename = sha1_file_name(sha1);
 	int fd = open(filename, O_RDONLY);
@@ -107,7 +136,7 @@ void *map_sha1_file(unsigned char *sha1, unsigned long *size)
 		return NULL;
 	}
 	if (fstat(fd, &st) < 0) {
-		close(fd);  
+		close(fd);
 		return NULL;
 	}
 	map = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
@@ -154,7 +183,7 @@ void * unpack_sha1_file(void *map, unsigned long mapsize, char *type, unsigned l
 	return buf;
 }
 
-void * read_sha1_file(unsigned char *sha1, char *type, unsigned long *size)
+void * read_sha1_file(const unsigned char *sha1, char *type, unsigned long *size)
 {
 	unsigned long mapsize;
 	void *map, *buf;
@@ -168,7 +197,7 @@ void * read_sha1_file(unsigned char *sha1, char *type, unsigned long *size)
 	return NULL;
 }
 
-int write_sha1_file(char *buf, unsigned len)
+int write_sha1_file(char *buf, unsigned len, unsigned char *returnsha1)
 {
 	int size;
 	char *compressed;
@@ -199,27 +228,166 @@ int write_sha1_file(char *buf, unsigned len)
 
 	if (write_sha1_buffer(sha1, compressed, size) < 0)
 		return -1;
-	printf("%s\n", sha1_to_hex(sha1));
+	if (returnsha1)
+		memcpy(returnsha1, sha1, 20);
 	return 0;
 }
 
-int write_sha1_buffer(unsigned char *sha1, void *buf, unsigned int size)
+static inline int collision_check(char *filename, void *buf, unsigned int size)
+{
+#ifdef COLLISION_CHECK
+	void *map;
+	int fd = open(filename, O_RDONLY);
+	struct stat st;
+	int cmp;
+
+	/* Unreadable object, or object went away? Strange. */
+	if (fd < 0)
+		return -1;
+
+	if (fstat(fd, &st) < 0 || size != st.st_size)
+		return -1;
+
+	map = mmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0);
+	close(fd);
+	if (map == MAP_FAILED)
+		return -1;
+	cmp = memcmp(buf, map, size);
+	munmap(map, size);
+	if (cmp)
+		return -1;
+#endif
+	return 0;
+}
+
+int write_sha1_buffer(const unsigned char *sha1, void *buf, unsigned int size)
 {
 	char *filename = sha1_file_name(sha1);
 	int fd;
 
 	fd = open(filename, O_WRONLY | O_CREAT | O_EXCL, 0666);
-	if (fd < 0)
-		return (errno == EEXIST) ? 0 : -1;
+	if (fd < 0) {
+		if (errno != EEXIST)
+			return -1;
+		if (collision_check(filename, buf, size))
+			return error("SHA1 collision detected!"
+					" This is bad, bad, BAD!\a\n");
+		return 0;
+	}
 	write(fd, buf, size);
 	close(fd);
 	return 0;
 }
 
-static int error(const char * string)
+int cache_match_stat(struct cache_entry *ce, struct stat *st)
 {
-	fprintf(stderr, "error: %s\n", string);
-	return -1;
+	unsigned int changed = 0;
+
+	if (ce->ce_mtime.sec != htonl(st->st_mtime))
+		changed |= MTIME_CHANGED;
+	if (ce->ce_ctime.sec != htonl(st->st_ctime))
+		changed |= CTIME_CHANGED;
+
+#ifdef NSEC
+	/*
+	 * nsec seems unreliable - not all filesystems support it, so
+	 * as long as it is in the inode cache you get right nsec
+	 * but after it gets flushed, you get zero nsec.
+	 */
+	if (ce->ce_mtime.nsec != htonl(st->st_mtim.tv_nsec)
+		changed |= MTIME_CHANGED;
+	if (ce->ce_ctime.nsec != htonl(st->st_ctim.tv_nsec)
+		changed |= CTIME_CHANGED;
+#endif	
+
+	if (ce->ce_uid != htonl(st->st_uid) ||
+	    ce->ce_gid != htonl(st->st_gid))
+		changed |= OWNER_CHANGED;
+	if (ce->ce_mode != htonl(st->st_mode))
+		changed |= MODE_CHANGED;
+	if (ce->ce_dev != htonl(st->st_dev) ||
+	    ce->ce_ino != htonl(st->st_ino))
+		changed |= INODE_CHANGED;
+	if (ce->ce_size != htonl(st->st_size))
+		changed |= DATA_CHANGED;
+	return changed;
+}
+
+int cache_name_compare(const char *name1, int len1, const char *name2, int len2)
+{
+	int len = len1 < len2 ? len1 : len2;
+	int cmp;
+
+	cmp = memcmp(name1, name2, len);
+	if (cmp)
+		return cmp;
+	if (len1 < len2)
+		return -1;
+	if (len1 > len2)
+		return 1;
+	return 0;
+}
+
+int cache_name_pos(const char *name, int namelen)
+{
+	int first, last;
+
+	first = 0;
+	last = active_nr;
+	while (last > first) {
+		int next = (last + first) >> 1;
+		struct cache_entry *ce = active_cache[next];
+		int cmp = cache_name_compare(name, namelen, ce->name, ce_namelen(ce));
+		if (!cmp)
+			return next;
+		if (cmp < 0) {
+			last = next;
+			continue;
+		}
+		first = next+1;
+	}
+	return -first-1;
+}
+
+int remove_file_from_cache(char *path)
+{
+	int pos = cache_name_pos(path, strlen(path));
+	if (pos >= 0) {
+		active_nr--;
+		if (pos < active_nr)
+			memmove(active_cache + pos, active_cache + pos + 1, (active_nr - pos) * sizeof(struct cache_entry *));
+	}
+	return 0;
+}
+
+int add_cache_entry(struct cache_entry *ce, int ok_to_add)
+{
+	int pos;
+
+	pos = cache_name_pos(ce->name, ce_namelen(ce));
+
+	/* existing match? Just replace it */
+	if (pos >= 0) {
+		active_cache[pos] = ce;
+		return 0;
+	}
+	pos = -pos-1;
+
+	if (!ok_to_add)
+		return -1;
+
+	/* Make sure the array is big enough .. */
+	if (active_nr == active_alloc) {
+		active_alloc = alloc_nr(active_alloc);
+		active_cache = realloc(active_cache, active_alloc * sizeof(struct cache_entry *));
+	}
+
+	/* Add it in.. */
+	active_nr++;
+	if (active_nr > pos)
+		memmove(active_cache + pos + 1, active_cache + pos, (active_nr - pos - 1) * sizeof(ce));
+	active_cache[pos] = ce;
+	return 0;
 }
 
 static int verify_hdr(struct cache_header *hdr, unsigned long size)
@@ -227,9 +395,9 @@ static int verify_hdr(struct cache_header *hdr, unsigned long size)
 	SHA_CTX c;
 	unsigned char sha1[20];
 
-	if (hdr->signature != CACHE_SIGNATURE)
+	if (hdr->hdr_signature != htonl(CACHE_SIGNATURE))
 		return error("bad signature");
-	if (hdr->version != 1)
+	if (hdr->hdr_version != htonl(1))
 		return error("bad version");
 	SHA1_Init(&c);
 	SHA1_Update(&c, hdr, offsetof(struct cache_header, sha1));
@@ -257,17 +425,16 @@ int read_cache(void)
 		sha1_file_directory = DEFAULT_DB_ENVIRONMENT;
 	if (access(sha1_file_directory, X_OK) < 0)
 		return error("no access to SHA1 file directory");
-	fd = open(".dircache/index", O_RDONLY);
+	fd = open(".git/index", O_RDONLY);
 	if (fd < 0)
 		return (errno == ENOENT) ? 0 : error("open failed");
 
 	size = 0; // avoid gcc warning
 	map = (void *)-1;
 	if (!fstat(fd, &st)) {
-		map = NULL;
 		size = st.st_size;
 		errno = EINVAL;
-		if (size > sizeof(struct cache_header))
+		if (size >= sizeof(struct cache_header))
 			map = mmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0);
 	}
 	close(fd);
@@ -278,12 +445,12 @@ int read_cache(void)
 	if (verify_hdr(hdr, size) < 0)
 		goto unmap;
 
-	active_nr = hdr->entries;
+	active_nr = ntohl(hdr->hdr_entries);
 	active_alloc = alloc_nr(active_nr);
 	active_cache = calloc(active_alloc, sizeof(struct cache_entry *));
 
 	offset = sizeof(*hdr);
-	for (i = 0; i < hdr->entries; i++) {
+	for (i = 0; i < active_nr; i++) {
 		struct cache_entry *ce = map + offset;
 		offset = offset + ce_size(ce);
 		active_cache[i] = ce;
@@ -296,3 +463,33 @@ unmap:
 	return error("verify header failed");
 }
 
+int write_cache(int newfd, struct cache_entry **cache, int entries)
+{
+	SHA_CTX c;
+	struct cache_header hdr;
+	int i;
+
+	hdr.hdr_signature = htonl(CACHE_SIGNATURE);
+	hdr.hdr_version = htonl(1);
+	hdr.hdr_entries = htonl(entries);
+
+	SHA1_Init(&c);
+	SHA1_Update(&c, &hdr, offsetof(struct cache_header, sha1));
+	for (i = 0; i < entries; i++) {
+		struct cache_entry *ce = cache[i];
+		int size = ce_size(ce);
+		SHA1_Update(&c, ce, size);
+	}
+	SHA1_Final(hdr.sha1, &c);
+
+	if (write(newfd, &hdr, sizeof(hdr)) != sizeof(hdr))
+		return -1;
+
+	for (i = 0; i < entries; i++) {
+		struct cache_entry *ce = cache[i];
+		int size = ce_size(ce);
+		if (write(newfd, ce, size) != size)
+			return -1;
+	}
+	return 0;
+}