git-add --intent-to-add (-N)

diff --git a/read-cache.c b/read-cache.c
index f0ba2247980cc938cc3f821a18e3b328966c4e06..276b09e66f603fa3816640a0f692775c5e15ba32 100644 (file)
--- a/read-cache.c
+++ b/read-cache.c
@@ -8,6 +8,12 @@
 #include "cache-tree.h"
 #include "refs.h"
 #include "dir.h"
+#include "tree.h"
+#include "commit.h"
+#include "diff.h"
+#include "diffcore.h"
+#include "revision.h"
+#include "blob.h"
 
 /* Index extensions.
  *
@@ -506,6 +512,14 @@ static struct cache_entry *create_alias_ce(struct cache_entry *ce, struct cache_
        return new;
 }
 
+static void record_intent_to_add(struct cache_entry *ce)
+{
+       unsigned char sha1[20];
+       if (write_sha1_file("", 0, blob_type, sha1))
+               die("cannot create an empty blob in the object database");
+       hashcpy(ce->sha1, sha1);
+}
+
 int add_to_index(struct index_state *istate, const char *path, struct stat *st, int flags)
 {
        int size, namelen, was_same;
@@ -514,6 +528,9 @@ int add_to_index(struct index_state *istate, const char *path, struct stat *st,
        unsigned ce_option = CE_MATCH_IGNORE_VALID|CE_MATCH_RACY_IS_DIRTY;
        int verbose = flags & (ADD_CACHE_VERBOSE | ADD_CACHE_PRETEND);
        int pretend = flags & ADD_CACHE_PRETEND;
+       int intent_only = flags & ADD_CACHE_INTENT;
+       int add_option = (ADD_CACHE_OK_TO_ADD|ADD_CACHE_OK_TO_REPLACE|
+                         (intent_only ? ADD_CACHE_NEW_ONLY : 0));
 
        if (!S_ISREG(st_mode) && !S_ISLNK(st_mode) && !S_ISDIR(st_mode))
                return error("%s: can only add regular files, symbolic links or git-directories", path);
@@ -527,7 +544,8 @@ int add_to_index(struct index_state *istate, const char *path, struct stat *st,
        ce = xcalloc(1, size);
        memcpy(ce->name, path, namelen);
        ce->ce_flags = namelen;
-       fill_stat_cache_info(ce, st);
+       if (!intent_only)
+               fill_stat_cache_info(ce, st);
 
        if (trust_executable_bit && has_symlinks)
                ce->ce_mode = create_ce_mode(st_mode);
@@ -550,8 +568,12 @@ int add_to_index(struct index_state *istate, const char *path, struct stat *st,
                alias->ce_flags |= CE_ADDED;
                return 0;
        }
-       if (index_path(ce->sha1, path, st, 1))
-               return error("unable to index file %s", path);
+       if (!intent_only) {
+               if (index_path(ce->sha1, path, st, 1))
+                       return error("unable to index file %s", path);
+       } else
+               record_intent_to_add(ce);
+
        if (ignore_case && alias && different_name(ce, alias))
                ce = create_alias_ce(ce, alias);
        ce->ce_flags |= CE_ADDED;
@@ -564,7 +586,7 @@ int add_to_index(struct index_state *istate, const char *path, struct stat *st,
 
        if (pretend)
                ;
-       else if (add_index_entry(istate, ce, ADD_CACHE_OK_TO_ADD|ADD_CACHE_OK_TO_REPLACE))
+       else if (add_index_entry(istate, ce, add_option))
                return error("unable to add %s to index",path);
        if (verbose && !was_same)
                printf("add '%s'\n", path);
@@ -843,13 +865,15 @@ static int add_index_entry_with_check(struct index_state *istate, struct cache_e
        int ok_to_add = option & ADD_CACHE_OK_TO_ADD;
        int ok_to_replace = option & ADD_CACHE_OK_TO_REPLACE;
        int skip_df_check = option & ADD_CACHE_SKIP_DFCHECK;
+       int new_only = option & ADD_CACHE_NEW_ONLY;
 
        cache_tree_invalidate_path(istate->cache_tree, ce->name);
        pos = index_name_pos(istate, ce->name, ce->ce_flags);
 
        /* existing match? Just replace it. */
        if (pos >= 0) {
-               replace_index_entry(istate, pos, ce);
+               if (!new_only)
+                       replace_index_entry(istate, pos, ce);
                return 0;
        }
        pos = -pos-1;
@@ -1159,7 +1183,7 @@ int read_index_from(struct index_state *istate, const char *path)
        size_t mmap_size;
 
        errno = EBUSY;
-       if (istate->alloc)
+       if (istate->initialized)
                return istate->cache_nr;
 
        errno = ENOENT;
@@ -1199,6 +1223,7 @@ int read_index_from(struct index_state *istate, const char *path)
         * index size
         */
        istate->alloc = xmalloc(estimate_cache_size(mmap_size, istate->cache_nr));
+       istate->initialized = 1;
 
        src_offset = sizeof(*hdr);
        dst_offset = 0;
@@ -1251,6 +1276,7 @@ int discard_index(struct index_state *istate)
        cache_tree_free(&(istate->cache_tree));
        free(istate->alloc);
        istate->alloc = NULL;
+       istate->initialized = 0;
 
        /* no need to throw away allocated active_cache */
        return 0;
@@ -1481,3 +1507,59 @@ int read_index_unmerged(struct index_state *istate)
        istate->cache_nr = dst - istate->cache;
        return !!last;
 }
+
+struct update_callback_data
+{
+       int flags;
+       int add_errors;
+};
+
+static void update_callback(struct diff_queue_struct *q,
+                           struct diff_options *opt, void *cbdata)
+{
+       int i;
+       struct update_callback_data *data = cbdata;
+
+       for (i = 0; i < q->nr; i++) {
+               struct diff_filepair *p = q->queue[i];
+               const char *path = p->one->path;
+               switch (p->status) {
+               default:
+                       die("unexpected diff status %c", p->status);
+               case DIFF_STATUS_UNMERGED:
+               case DIFF_STATUS_MODIFIED:
+               case DIFF_STATUS_TYPE_CHANGED:
+                       if (add_file_to_index(&the_index, path, data->flags)) {
+                               if (!(data->flags & ADD_CACHE_IGNORE_ERRORS))
+                                       die("updating files failed");
+                               data->add_errors++;
+                       }
+                       break;
+               case DIFF_STATUS_DELETED:
+                       if (data->flags & ADD_CACHE_IGNORE_REMOVAL)
+                               break;
+                       if (!(data->flags & ADD_CACHE_PRETEND))
+                               remove_file_from_index(&the_index, path);
+                       if (data->flags & (ADD_CACHE_PRETEND|ADD_CACHE_VERBOSE))
+                               printf("remove '%s'\n", path);
+                       break;
+               }
+       }
+}
+
+int add_files_to_cache(const char *prefix, const char **pathspec, int flags)
+{
+       struct update_callback_data data;
+       struct rev_info rev;
+       init_revisions(&rev, prefix);
+       setup_revisions(0, NULL, &rev, NULL);
+       rev.prune_data = pathspec;
+       rev.diffopt.output_format = DIFF_FORMAT_CALLBACK;
+       rev.diffopt.format_callback = update_callback;
+       data.flags = flags;
+       data.add_errors = 0;
+       rev.diffopt.format_callback_data = &data;
+       run_diff_files(&rev, DIFF_RACY_IS_MODIFIED);
+       return !!data.add_errors;
+}
+