X-Git-Url: https://git.verplant.org/?a=blobdiff_plain;f=read-cache.c;h=042b0c2107330c35731a4d42c9907e0b34ad5257;hb=e8871e88adca0637eb0299a41d85400beac928bd;hp=ebace34d059216b3573cd67a83068d2eafe2f2e7;hpb=121481abf8d752ef871821d4ab9a3747595d86ae;p=git.git

diff --git a/read-cache.c b/read-cache.c
index ebace34d..042b0c21 100644
--- a/read-cache.c
+++ b/read-cache.c
@@ -3,22 +3,47 @@
  *
  * Copyright (C) Linus Torvalds, 2005
  */
+#include <stdarg.h>
 #include "cache.h"
 
 const char *sha1_file_directory = NULL;
 struct cache_entry **active_cache = NULL;
 unsigned int active_nr = 0, active_alloc = 0;
 
-void usage(const char *err, ...)
+void usage(const char *err)
 {
-	va_list args;
+	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(args, err);
-	vfprintf(stderr, err, args);
-	va_end(args);
+	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')
@@ -63,7 +88,7 @@ char * sha1_to_hex(const 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;
@@ -99,7 +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);
@@ -111,7 +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);
@@ -158,7 +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;
@@ -208,50 +233,91 @@ int write_sha1_file(char *buf, unsigned len, unsigned char *returnsha1)
 	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)
 {
-	char *filename = sha1_file_name(sha1);
-	int fd;
+#ifdef COLLISION_CHECK
+	void *map;
+	int fd = open(filename, O_RDONLY);
+	struct stat st;
+	int cmp;
 
-	fd = open(filename, O_WRONLY | O_CREAT | O_EXCL, 0666);
+	/* Unreadable object, or object went away? Strange. */
 	if (fd < 0)
-		return (errno == EEXIST) ? 0 : -1;
-	write(fd, buf, size);
+		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;
 }
 
-static int error(const char * string)
+int write_sha1_buffer(const unsigned char *sha1, void *buf, unsigned int size)
 {
-	fprintf(stderr, "error: %s\n", string);
-	return -1;
+	char *filename = sha1_file_name(sha1);
+	int fd;
+
+	fd = open(filename, O_WRONLY | O_CREAT | O_EXCL, 0666);
+	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;
 }
 
 int cache_match_stat(struct cache_entry *ce, struct stat *st)
 {
 	unsigned int changed = 0;
 
-	if (ce->mtime.sec  != (unsigned int)st->st_mtim.tv_sec ||
-	    ce->mtime.nsec != (unsigned int)st->st_mtim.tv_nsec)
+	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->ctime.sec  != (unsigned int)st->st_ctim.tv_sec ||
-	    ce->ctime.nsec != (unsigned int)st->st_ctim.tv_nsec)
+	if (ce->ce_ctime.nsec != htonl(st->st_ctim.tv_nsec)
 		changed |= CTIME_CHANGED;
-	if (ce->st_uid != (unsigned int)st->st_uid ||
-	    ce->st_gid != (unsigned int)st->st_gid)
+#endif	
+
+	if (ce->ce_uid != htonl(st->st_uid) ||
+	    ce->ce_gid != htonl(st->st_gid))
 		changed |= OWNER_CHANGED;
-	if (ce->st_mode != (unsigned int)st->st_mode)
+	/* We consider only the owner x bit to be relevant for "mode changes" */
+	if (0100 & (ntohl(ce->ce_mode) ^ st->st_mode))
 		changed |= MODE_CHANGED;
-	if (ce->st_dev != (unsigned int)st->st_dev ||
-	    ce->st_ino != (unsigned int)st->st_ino)
+	if (ce->ce_dev != htonl(st->st_dev) ||
+	    ce->ce_ino != htonl(st->st_ino))
 		changed |= INODE_CHANGED;
-	if (ce->st_size != (unsigned int)st->st_size)
+	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 cache_name_compare(const char *name1, int flags1, const char *name2, int flags2)
 {
+	int len1 = flags1 & CE_NAMEMASK;
+	int len2 = flags2 & CE_NAMEMASK;
 	int len = len1 < len2 ? len1 : len2;
 	int cmp;
 
@@ -262,6 +328,10 @@ int cache_name_compare(const char *name1, int len1, const char *name2, int len2)
 		return -1;
 	if (len1 > len2)
 		return 1;
+	if (flags1 < flags2)
+		return -1;
+	if (flags1 > flags2)
+		return 1;
 	return 0;
 }
 
@@ -274,41 +344,69 @@ int cache_name_pos(const char *name, int namelen)
 	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);
+		int cmp = cache_name_compare(name, namelen, ce->name, htons(ce->ce_flags));
 		if (!cmp)
-			return -next-1;
+			return next;
 		if (cmp < 0) {
 			last = next;
 			continue;
 		}
 		first = next+1;
 	}
-	return first;
+	return -first-1;
+}
+
+/* Remove entry, return true if there are more entries to go.. */
+static int remove_entry_at(int pos)
+{
+	active_nr--;
+	if (pos >= active_nr)
+		return 0;
+	memmove(active_cache + pos, active_cache + pos + 1, (active_nr - pos) * sizeof(struct cache_entry *));
+	return 1;
 }
 
 int remove_file_from_cache(char *path)
 {
 	int pos = cache_name_pos(path, strlen(path));
-	if (pos < 0) {
+	if (pos < 0)
 		pos = -pos-1;
-		active_nr--;
-		if (pos < active_nr)
-			memmove(active_cache + pos, active_cache + pos + 1, (active_nr - pos - 1) * sizeof(struct cache_entry *));
-	}
+	while (pos < active_nr && !strcmp(active_cache[pos]->name, path))
+		remove_entry_at(pos);
 	return 0;
 }
 
+static int same_name(struct cache_entry *a, struct cache_entry *b)
+{
+	int len = ce_namelen(a);
+	return ce_namelen(b) == len && !memcmp(a->name, b->name, len);
+}
+
 int add_cache_entry(struct cache_entry *ce, int ok_to_add)
 {
 	int pos;
 
-	pos = cache_name_pos(ce->name, ce->namelen);
+	pos = cache_name_pos(ce->name, htons(ce->ce_flags));
 
 	/* existing match? Just replace it */
-	if (pos < 0) {
-		active_cache[-pos-1] = ce;
+	if (pos >= 0) {
+		active_cache[pos] = ce;
 		return 0;
 	}
+	pos = -pos-1;
+
+	/*
+	 * Inserting a merged entry ("stage 0") into the index
+	 * will always replace all non-merged entries..
+	 */
+	if (pos < active_nr && ce_stage(ce) == 0) {
+		while (same_name(active_cache[pos], ce)) {
+			ok_to_add = 1;
+			active_nr--;
+			if (!remove_entry_at(pos))
+				break;
+		}
+	}
 
 	if (!ok_to_add)
 		return -1;
@@ -332,9 +430,9 @@ 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));
@@ -362,7 +460,7 @@ 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");
 
@@ -382,12 +480,12 @@ 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;
@@ -406,9 +504,9 @@ int write_cache(int newfd, struct cache_entry **cache, int entries)
 	struct cache_header hdr;
 	int i;
 
-	hdr.signature = CACHE_SIGNATURE;
-	hdr.version = 1;
-	hdr.entries = entries;
+	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));