*
* 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;
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
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;
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) {
}
/* 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--;
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);
* 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)
+static int check_file_directory_conflict(const struct cache_entry *ce,
+ int ok_to_replace)
{
- int pos;
+ int pos, replaced = 0;
const char *path = ce->name;
int namelen = strlen(path);
int stage = ce_stage(ce);
cp = pathbuf;
while (1) {
char *ep = strchr(cp, '/');
- if (ep == 0)
+ int len;
+ if (!ep)
break;
*ep = 0; /* first cut it at slash */
+ len = ep - pathbuf;
pos = cache_name_pos(pathbuf,
- htons(create_ce_flags(ep-cp, stage)));
+ ntohs(create_ce_flags(len, 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.
*/
- free(pathbuf);
- return -1;
+ 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_cache_entry_at(pos);
+ replaced = 1;
}
*ep = '/'; /* then restore it and go downwards */
cp = ep + 1;
* a directory there?
*/
pos = cache_name_pos(path,
- htons(create_ce_flags(namelen, stage)));
+ ntohs(create_ce_flags(namelen, stage)));
/* (0 <= pos) cannot happen because add_cache_entry()
* should have taken care of that case.
*
* 1 path
* pos-> 3 path
- * 2 path/file
- * 3 path/file
+ * 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.
+ * complain. We need to do this until we are not the leading
+ * path of an existing entry anymore.
*/
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] == '/')
- return -1;
+ 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_cache_entry_at(pos);
+ replaced = 1;
+ continue; /* cycle without updating pos */
+ }
pos++;
}
-
- return 0;
+ return replaced;
}
-int add_cache_entry(struct cache_entry *ce, int ok_to_add)
+int add_cache_entry(struct cache_entry *ce, int option)
{
int pos;
-
- pos = cache_name_pos(ce->name, htons(ce->ce_flags));
+ 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, ntohs(ce->ce_flags));
/* existing match? Just replace it */
if (pos >= 0) {
* 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;
}
}
if (!ok_to_add)
return -1;
- if (check_file_directory_conflict(ce))
- return -1;
+ if (check_file_directory_conflict(ce, ok_to_replace)) {
+ if (!ok_to_replace)
+ return -1;
+ pos = cache_name_pos(ce->name, ntohs(ce->ce_flags));
+ pos = -pos-1;
+ }
/* Make sure the array is big enough .. */
if (active_nr == active_alloc) {
}
#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)
{
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)
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;
}