"Assume unchanged" git

[git.git] / update-index.c

diff --git a/update-index.c b/update-index.c
index afec98d..767fd49 100644 (file)
--- a/update-index.c
+++ b/update-index.c
@@ -23,6 +23,10 @@ static int quiet; /* --refresh needing update is not error */
 static int info_only;
 static int force_remove;
 static int verbose;
+static int mark_valid_only = 0;
+#define MARK_VALID 1
+#define UNMARK_VALID 2
+
 
 /* Three functions to allow overloaded pointer return; see linux/err.h */
 static inline void *ERR_PTR(long error)
@@ -53,6 +57,25 @@ static void report(const char *fmt, ...)
        va_end(vp);
 }
 
+static int mark_valid(const char *path)
+{
+       int namelen = strlen(path);
+       int pos = cache_name_pos(path, namelen);
+       if (0 <= pos) {
+               switch (mark_valid_only) {
+               case MARK_VALID:
+                       active_cache[pos]->ce_flags |= htons(CE_VALID);
+                       break;
+               case UNMARK_VALID:
+                       active_cache[pos]->ce_flags &= ~htons(CE_VALID);
+                       break;
+               }
+               active_cache_changed = 1;
+               return 0;
+       }
+       return -1;
+}
+
 static int add_file_to_cache(const char *path)
 {
        int size, namelen, option, status;
@@ -94,6 +117,7 @@ static int add_file_to_cache(const char *path)
        ce = xmalloc(size);
        memset(ce, 0, size);
        memcpy(ce->name, path, namelen);
+       ce->ce_flags = htons(namelen);
        fill_stat_cache_info(ce, &st);
 
        ce->ce_mode = create_ce_mode(st.st_mode);
@@ -105,7 +129,6 @@ static int add_file_to_cache(const char *path)
                if (0 <= pos)
                        ce->ce_mode = active_cache[pos]->ce_mode;
        }
-       ce->ce_flags = htons(namelen);
 
        if (index_path(ce->sha1, path, &st, !info_only))
                return -1;
@@ -128,7 +151,7 @@ static int add_file_to_cache(const char *path)
  * For example, you'd want to do this after doing a "git-read-tree",
  * to link up the stat cache details with the proper files.
  */
-static struct cache_entry *refresh_entry(struct cache_entry *ce)
+static struct cache_entry *refresh_entry(struct cache_entry *ce, int really)
 {
        struct stat st;
        struct cache_entry *updated;
@@ -137,21 +160,22 @@ static struct cache_entry *refresh_entry(struct cache_entry *ce)
        if (lstat(ce->name, &st) < 0)
                return ERR_PTR(-errno);
 
-       changed = ce_match_stat(ce, &st);
+       changed = ce_match_stat(ce, &st, really);
        if (!changed)
                return NULL;
 
-       if (ce_modified(ce, &st))
+       if (ce_modified(ce, &st, really))
                return ERR_PTR(-EINVAL);
 
        size = ce_size(ce);
        updated = xmalloc(size);
        memcpy(updated, ce, size);
        fill_stat_cache_info(updated, &st);
+
        return updated;
 }
 
-static int refresh_cache(void)
+static int refresh_cache(int really)
 {
        int i;
        int has_errors = 0;
@@ -171,12 +195,19 @@ static int refresh_cache(void)
                        continue;
                }
 
-               new = refresh_entry(ce);
+               new = refresh_entry(ce, really);
                if (!new)
                        continue;
                if (IS_ERR(new)) {
                        if (not_new && PTR_ERR(new) == -ENOENT)
                                continue;
+                       if (really && PTR_ERR(new) == -EINVAL) {
+                               /* If we are doing --really-refresh that
+                                * means the index is not valid anymore.
+                                */
+                               ce->ce_flags &= ~htons(CE_VALID);
+                               active_cache_changed = 1;
+                       }
                        if (quiet)
                                continue;
                        printf("%s: needs update\n", ce->name);
@@ -274,6 +305,8 @@ static int add_cacheinfo(unsigned int mode, const unsigned char *sha1,
        memcpy(ce->name, path, len);
        ce->ce_flags = create_ce_flags(len, stage);
        ce->ce_mode = create_ce_mode(mode);
+       if (assume_unchanged)
+               ce->ce_flags |= htons(CE_VALID);
        option = allow_add ? ADD_CACHE_OK_TO_ADD : 0;
        option |= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0;
        if (add_cache_entry(ce, option))
@@ -317,6 +350,12 @@ static void update_one(const char *path, const char *prefix, int prefix_length)
                fprintf(stderr, "Ignoring path %s\n", path);
                return;
        }
+       if (mark_valid_only) {
+               if (mark_valid(p))
+                       die("Unable to mark file %s", path);
+               return;
+       }
+
        if (force_remove) {
                if (remove_file_from_cache(p))
                        die("git-update-index: unable to remove %s", path);
@@ -467,7 +506,11 @@ int main(int argc, const char **argv)
                                continue;
                        }
                        if (!strcmp(path, "--refresh")) {
-                               has_errors |= refresh_cache();
+                               has_errors |= refresh_cache(0);
+                               continue;
+                       }
+                       if (!strcmp(path, "--really-refresh")) {
+                               has_errors |= refresh_cache(1);
                                continue;
                        }
                        if (!strcmp(path, "--cacheinfo")) {
@@ -493,6 +536,14 @@ int main(int argc, const char **argv)
                                        die("git-update-index: %s cannot chmod %s", path, argv[i]);
                                continue;
                        }
+                       if (!strcmp(path, "--assume-unchanged")) {
+                               mark_valid_only = MARK_VALID;
+                               continue;
+                       }
+                       if (!strcmp(path, "--no-assume-unchanged")) {
+                               mark_valid_only = UNMARK_VALID;
+                               continue;
+                       }
                        if (!strcmp(path, "--info-only")) {
                                info_only = 1;
                                continue;