X-Git-Url: https://git.octo.it/?a=blobdiff_plain;f=read-cache.c;h=5820f18d9a79fd83ff5a418a5dfc68bbf7c5c354;hb=5bdac8b3269aea963c3192c93c26c1524def5464;hp=da2adf4612c3a1cb39fbb76e303302e9b7e1356b;hpb=f1a7eb36b017c62d9a007b6b8660bdeec3f94f97;p=git.git

diff --git a/read-cache.c b/read-cache.c
index da2adf46..5820f18d 100644
--- a/read-cache.c
+++ b/read-cache.c
@@ -3,13 +3,32 @@
  *
  * Copyright (C) Linus Torvalds, 2005
  */
-#include <stdarg.h>
 #include "cache.h"
 
 struct cache_entry **active_cache = NULL;
 unsigned int active_nr = 0, active_alloc = 0, active_cache_changed = 0;
 
-int cache_match_stat(struct cache_entry *ce, struct stat *st)
+/*
+ * This only updates the "non-critical" parts of the directory
+ * cache, ie the parts that aren't tracked by GIT, and only used
+ * to validate the cache.
+ */
+void fill_stat_cache_info(struct cache_entry *ce, struct stat *st)
+{
+	ce->ce_ctime.sec = htonl(st->st_ctime);
+	ce->ce_mtime.sec = htonl(st->st_mtime);
+#ifdef USE_NSEC
+	ce->ce_ctime.nsec = htonl(st->st_ctim.tv_nsec);
+	ce->ce_mtime.nsec = htonl(st->st_mtim.tv_nsec);
+#endif
+	ce->ce_dev = htonl(st->st_dev);
+	ce->ce_ino = htonl(st->st_ino);
+	ce->ce_uid = htonl(st->st_uid);
+	ce->ce_gid = htonl(st->st_gid);
+	ce->ce_size = htonl(st->st_size);
+}
+
+int ce_match_stat(struct cache_entry *ce, struct stat *st)
 {
 	unsigned int changed = 0;
 
@@ -31,7 +50,7 @@ int cache_match_stat(struct cache_entry *ce, struct stat *st)
 	if (ce->ce_ctime.sec != htonl(st->st_ctime))
 		changed |= CTIME_CHANGED;
 
-#ifdef NSEC
+#ifdef USE_NSEC
 	/*
 	 * nsec seems unreliable - not all filesystems support it, so
 	 * as long as it is in the inode cache you get right nsec
@@ -46,14 +65,43 @@ int cache_match_stat(struct cache_entry *ce, struct stat *st)
 	if (ce->ce_uid != htonl(st->st_uid) ||
 	    ce->ce_gid != htonl(st->st_gid))
 		changed |= OWNER_CHANGED;
-	if (ce->ce_dev != htonl(st->st_dev) ||
-	    ce->ce_ino != htonl(st->st_ino))
+	if (ce->ce_ino != htonl(st->st_ino))
 		changed |= INODE_CHANGED;
+
+#ifdef USE_STDEV
+	/*
+	 * st_dev breaks on network filesystems where different
+	 * clients will have different views of what "device"
+	 * the filesystem is on
+	 */
+	if (ce->ce_dev != htonl(st->st_dev))
+		changed |= INODE_CHANGED;
+#endif
+
 	if (ce->ce_size != htonl(st->st_size))
 		changed |= DATA_CHANGED;
 	return changed;
 }
 
+int base_name_compare(const char *name1, int len1, int mode1,
+		      const char *name2, int len2, int mode2)
+{
+	unsigned char c1, c2;
+	int len = len1 < len2 ? len1 : len2;
+	int cmp;
+
+	cmp = memcmp(name1, name2, len);
+	if (cmp)
+		return cmp;
+	c1 = name1[len];
+	c2 = name2[len];
+	if (!c1 && S_ISDIR(mode1))
+		c1 = '/';
+	if (!c2 && S_ISDIR(mode2))
+		c2 = '/';
+	return (c1 < c2) ? -1 : (c1 > c2) ? 1 : 0;
+}
+
 int cache_name_compare(const char *name1, int flags1, const char *name2, int flags2)
 {
 	int len1 = flags1 & CE_NAMEMASK;
@@ -84,7 +132,7 @@ 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, htons(ce->ce_flags));
+		int cmp = cache_name_compare(name, namelen, ce->name, ntohs(ce->ce_flags));
 		if (!cmp)
 			return next;
 		if (cmp < 0) {
@@ -97,7 +145,7 @@ int cache_name_pos(const char *name, int namelen)
 }
 
 /* Remove entry, return true if there are more entries to go.. */
-int remove_entry_at(int pos)
+int remove_cache_entry_at(int pos)
 {
 	active_cache_changed = 1;
 	active_nr--;
@@ -113,115 +161,148 @@ int remove_file_from_cache(char *path)
 	if (pos < 0)
 		pos = -pos-1;
 	while (pos < active_nr && !strcmp(active_cache[pos]->name, path))
-		remove_entry_at(pos);
+		remove_cache_entry_at(pos);
 	return 0;
 }
 
-int same_name(struct cache_entry *a, struct cache_entry *b)
+int ce_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);
 }
 
-/* We may be in a situation where we already have path/file and path
- * is being added, or we already have path and path/file is being
- * added.  Either one would result in a nonsense tree that has path
- * twice when git-write-tree tries to write it out.  Prevent it.
- * 
- * If ok-to-replace is specified, we remove the conflicting entries
- * from the cache so the caller should recompute the insert position.
- * When this happens, we return non-zero.
+int ce_path_match(const struct cache_entry *ce, const char **pathspec)
+{
+	const char *match, *name;
+	int len;
+
+	if (!pathspec)
+		return 1;
+
+	len = ce_namelen(ce);
+	name = ce->name;
+	while ((match = *pathspec++) != NULL) {
+		int matchlen = strlen(match);
+		if (matchlen > len)
+			continue;
+		if (memcmp(name, match, matchlen))
+			continue;
+		if (matchlen && name[matchlen-1] == '/')
+			return 1;
+		if (name[matchlen] == '/' || !name[matchlen])
+			return 1;
+	}
+	return 0;
+}
+
+/*
+ * Do we have another file that has the beginning components being a
+ * proper superset of the name we're trying to add?
  */
-static int check_file_directory_conflict(const struct cache_entry *ce,
-					 int ok_to_replace)
+static int has_file_name(const struct cache_entry *ce, int pos, int ok_to_replace)
 {
-	int pos, replaced = 0;
-	const char *path = ce->name;
-	int namelen = strlen(path);
+	int retval = 0;
+	int len = ce_namelen(ce);
 	int stage = ce_stage(ce);
-	char *pathbuf = xmalloc(namelen + 1);
-	char *cp;
+	const char *name = ce->name;
 
-	memcpy(pathbuf, path, namelen + 1);
+	while (pos < active_nr) {
+		struct cache_entry *p = active_cache[pos++];
 
-	/*
-	 * We are inserting path/file.  Do they have path registered at
-	 * the same stage?  We need to do this for all the levels of our
-	 * subpath.
-	 */
-	cp = pathbuf;
-	while (1) {
-		char *ep = strchr(cp, '/');
-		if (!ep)
+		if (len >= ce_namelen(p))
 			break;
-		*ep = 0;    /* first cut it at slash */
-		pos = cache_name_pos(pathbuf,
-				     htons(create_ce_flags(ep-cp, stage)));
-		if (0 <= pos) {
-			/* Our leading path component is registered as a file,
-			 * and we are trying to make it a directory.  This is
-			 * bad.
-			 */
-			if (!ok_to_replace) {
-				free(pathbuf);
-				return -1;
-			}
-			fprintf(stderr, "removing file '%s' to replace it with a directory to create '%s'.\n", pathbuf, path);
-			remove_entry_at(pos);
-			replaced = 1;
-		}
-		*ep = '/';  /* then restore it and go downwards */
-		cp = ep + 1;
+		if (memcmp(name, p->name, len))
+			break;
+		if (ce_stage(p) != stage)
+			continue;
+		if (p->name[len] != '/')
+			continue;
+		retval = -1;
+		if (!ok_to_replace)
+			break;
+		remove_cache_entry_at(--pos);
 	}
-	free(pathbuf);
+	return retval;
+}
 
-	/* Do we have an entry in the cache that makes our path a prefix
-	 * of it?  That is, are we creating a file where they already expect
-	 * a directory there?
-	 */
-	pos = cache_name_pos(path,
-			     htons(create_ce_flags(namelen, stage)));
+/*
+ * Do we have another file with a pathname that is a proper
+ * subset of the name we're trying to add?
+ */
+static int has_dir_name(const struct cache_entry *ce, int pos, int ok_to_replace)
+{
+	int retval = 0;
+	int stage = ce_stage(ce);
+	const char *name = ce->name;
+	const char *slash = name + ce_namelen(ce);
 
-	/* (0 <= pos) cannot happen because add_cache_entry()
-	 * should have taken care of that case.
-	 */
-	pos = -pos-1;
+	for (;;) {
+		int len;
 
-	/* pos would point at an existing entry that would come immediately
-	 * after our path.  It could be the same as our path in higher stage,
-	 * or different path but in a lower stage.
-	 *
-	 * E.g. when we are inserting path at stage 2,
-	 *
-	 *        1 path
-	 * pos->  3 path
-	 *        2 path/file1
-	 *        3 path/file1
-	 *        2 path/file2
-	 *        2 patho
-	 *
-	 * We need to examine pos, ignore it because it is at different
-	 * stage, examine next to find the path/file at stage 2, and
-	 * complain.  We need to do this until we are not the leading
-	 * path of an existing entry anymore.
-	 */
+		for (;;) {
+			if (*--slash == '/')
+				break;
+			if (slash <= ce->name)
+				return retval;
+		}
+		len = slash - name;
 
-	while (pos < active_nr) {
-		struct cache_entry *other = active_cache[pos];
-		if (strncmp(other->name, path, namelen))
-			break; /* it is not our "subdirectory" anymore */
-		if ((ce_stage(other) == stage) &&
-		    other->name[namelen] == '/') {
-			if (!ok_to_replace)
-				return -1;
-			fprintf(stderr, "removing file '%s' under '%s' to be replaced with a file\n", other->name, path);
-			remove_entry_at(pos);
-			replaced = 1;
-			continue; /* cycle without updating pos */
+		pos = cache_name_pos(name, ntohs(create_ce_flags(len, stage)));
+		if (pos >= 0) {
+			retval = -1;
+			if (ok_to_replace)
+				break;
+			remove_cache_entry_at(pos);
+			continue;
+		}
+
+		/*
+		 * Trivial optimization: if we find an entry that
+		 * already matches the sub-directory, then we know
+		 * we're ok, and we can exit.
+		 */
+		pos = -pos-1;
+		while (pos < active_nr) {
+			struct cache_entry *p = active_cache[pos];
+			if ((ce_namelen(p) <= len) ||
+			    (p->name[len] != '/') ||
+			    memcmp(p->name, name, len))
+				break; /* not our subdirectory */
+			if (ce_stage(p) == stage)
+				/* p is at the same stage as our entry, and
+				 * is a subdirectory of what we are looking
+				 * at, so we cannot have conflicts at our
+				 * level or anything shorter.
+				 */
+				return retval;
+			pos++;
 		}
-		pos++;
 	}
-	return replaced;
+	return retval;
+}
+
+/* We may be in a situation where we already have path/file and path
+ * is being added, or we already have path and path/file is being
+ * added.  Either one would result in a nonsense tree that has path
+ * twice when git-write-tree tries to write it out.  Prevent it.
+ * 
+ * If ok-to-replace is specified, we remove the conflicting entries
+ * from the cache so the caller should recompute the insert position.
+ * When this happens, we return non-zero.
+ */
+static int check_file_directory_conflict(const struct cache_entry *ce, int pos, int ok_to_replace)
+{
+	/*
+	 * We check if the path is a sub-path of a subsequent pathname
+	 * first, since removing those will not change the position
+	 * in the array
+	 */
+	int retval = has_file_name(ce, pos, ok_to_replace);
+	/*
+	 * Then check if the path might have a clashing sub-directory
+	 * before it.
+	 */
+	return retval + has_dir_name(ce, pos, ok_to_replace);
 }
 
 int add_cache_entry(struct cache_entry *ce, int option)
@@ -229,7 +310,8 @@ int add_cache_entry(struct cache_entry *ce, int option)
 	int pos;
 	int ok_to_add = option & ADD_CACHE_OK_TO_ADD;
 	int ok_to_replace = option & ADD_CACHE_OK_TO_REPLACE;
-	pos = cache_name_pos(ce->name, htons(ce->ce_flags));
+	int skip_df_check = option & ADD_CACHE_SKIP_DFCHECK;
+	pos = cache_name_pos(ce->name, ntohs(ce->ce_flags));
 
 	/* existing match? Just replace it */
 	if (pos >= 0) {
@@ -244,9 +326,9 @@ int add_cache_entry(struct cache_entry *ce, int option)
 	 * will always replace all non-merged entries..
 	 */
 	if (pos < active_nr && ce_stage(ce) == 0) {
-		while (same_name(active_cache[pos], ce)) {
+		while (ce_same_name(active_cache[pos], ce)) {
 			ok_to_add = 1;
-			if (!remove_entry_at(pos))
+			if (!remove_cache_entry_at(pos))
 				break;
 		}
 	}
@@ -254,10 +336,10 @@ int add_cache_entry(struct cache_entry *ce, int option)
 	if (!ok_to_add)
 		return -1;
 
-	if (check_file_directory_conflict(ce, ok_to_replace)) {
+	if (!skip_df_check && check_file_directory_conflict(ce, pos, ok_to_replace)) {
 		if (!ok_to_replace)
 			return -1;
-		pos = cache_name_pos(ce->name, htons(ce->ce_flags));
+		pos = cache_name_pos(ce->name, ntohs(ce->ce_flags));
 		pos = -pos-1;
 	}
 
@@ -310,7 +392,7 @@ int read_cache(void)
 		return (errno == ENOENT) ? 0 : error("open failed");
 
 	size = 0; // avoid gcc warning
-	map = (void *)-1;
+	map = MAP_FAILED;
 	if (!fstat(fd, &st)) {
 		size = st.st_size;
 		errno = EINVAL;
@@ -318,7 +400,7 @@ int read_cache(void)
 			map = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
 	}
 	close(fd);
-	if (-1 == (int)(long)map)
+	if (map == MAP_FAILED)
 		return error("mmap failed");
 
 	hdr = map;
@@ -344,7 +426,7 @@ unmap:
 }
 
 #define WRITE_BUFFER_SIZE 8192
-static char write_buffer[WRITE_BUFFER_SIZE];
+static unsigned char write_buffer[WRITE_BUFFER_SIZE];
 static unsigned long write_buffer_len;
 
 static int ce_write(SHA_CTX *context, int fd, void *data, unsigned int len)
@@ -390,11 +472,15 @@ int write_cache(int newfd, struct cache_entry **cache, int entries)
 {
 	SHA_CTX c;
 	struct cache_header hdr;
-	int i;
+	int i, removed;
+
+	for (i = removed = 0; i < entries; i++)
+		if (!cache[i]->ce_mode)
+			removed++;
 
 	hdr.hdr_signature = htonl(CACHE_SIGNATURE);
 	hdr.hdr_version = htonl(2);
-	hdr.hdr_entries = htonl(entries);
+	hdr.hdr_entries = htonl(entries - removed);
 
 	SHA1_Init(&c);
 	if (ce_write(&c, newfd, &hdr, sizeof(hdr)) < 0)
@@ -402,6 +488,8 @@ int write_cache(int newfd, struct cache_entry **cache, int entries)
 
 	for (i = 0; i < entries; i++) {
 		struct cache_entry *ce = cache[i];
+		if (!ce->ce_mode)
+			continue;
 		if (ce_write(&c, newfd, ce, ce_size(ce)) < 0)
 			return -1;
 	}