resolve-undo.c

   1 #include "cache.h"
   2 #include "dir.h"
   3 #include "resolve-undo.h"
   4 #include "string-list.h"
   5
   6 /* The only error case is to run out of memory in string-list */
   7 void record_resolve_undo(struct index_state *istate, struct cache_entry *ce)
   8 {
   9         struct string_list_item *lost;
  10         struct resolve_undo_info *ui;
  11         struct string_list *resolve_undo;
  12         int stage = ce_stage(ce);
  13
  14         if (!stage)
  15                 return;
  16
  17         if (!istate->resolve_undo) {
  18                 CALLOC_ARRAY(resolve_undo, 1);
  19                 resolve_undo->strdup_strings = 1;
  20                 istate->resolve_undo = resolve_undo;
  21         }
  22         resolve_undo = istate->resolve_undo;
  23         lost = string_list_insert(resolve_undo, ce->name);
  24         if (!lost->util)
  25                 lost->util = xcalloc(1, sizeof(*ui));
  26         ui = lost->util;
  27         oidcpy(&ui->oid[stage - 1], &ce->oid);
  28         ui->mode[stage - 1] = ce->ce_mode;
  29 }
  30
  31 void resolve_undo_write(struct strbuf *sb, struct string_list *resolve_undo)
  32 {
  33         struct string_list_item *item;
  34         for_each_string_list_item(item, resolve_undo) {
  35                 struct resolve_undo_info *ui = item->util;
  36                 int i;
  37
  38                 if (!ui)
  39                         continue;
  40                 strbuf_addstr(sb, item->string);
  41                 strbuf_addch(sb, 0);
  42                 for (i = 0; i < 3; i++)
  43                         strbuf_addf(sb, "%o%c", ui->mode[i], 0);
  44                 for (i = 0; i < 3; i++) {
  45                         if (!ui->mode[i])
  46                                 continue;
  47                         strbuf_add(sb, ui->oid[i].hash, the_hash_algo->rawsz);
  48                 }
  49         }
  50 }
  51
  52 struct string_list *resolve_undo_read(const char *data, unsigned long size)
  53 {
  54         struct string_list *resolve_undo;
  55         size_t len;
  56         char *endptr;
  57         int i;
  58         const unsigned rawsz = the_hash_algo->rawsz;
  59
  60         CALLOC_ARRAY(resolve_undo, 1);
  61         resolve_undo->strdup_strings = 1;
  62
  63         while (size) {
  64                 struct string_list_item *lost;
  65                 struct resolve_undo_info *ui;
  66
  67                 len = strlen(data) + 1;
  68                 if (size <= len)
  69                         goto error;
  70                 lost = string_list_insert(resolve_undo, data);
  71                 if (!lost->util)
  72                         lost->util = xcalloc(1, sizeof(*ui));
  73                 ui = lost->util;
  74                 size -= len;
  75                 data += len;
  76
  77                 for (i = 0; i < 3; i++) {
  78                         ui->mode[i] = strtoul(data, &endptr, 8);
  79                         if (!endptr || endptr == data || *endptr)
  80                                 goto error;
  81                         len = (endptr + 1) - (char*)data;
  82                         if (size <= len)
  83                                 goto error;
  84                         size -= len;
  85                         data += len;
  86                 }
  87
  88                 for (i = 0; i < 3; i++) {
  89                         if (!ui->mode[i])
  90                                 continue;
  91                         if (size < rawsz)
  92                                 goto error;
  93                         oidread(&ui->oid[i], (const unsigned char *)data);
  94                         size -= rawsz;
  95                         data += rawsz;
  96                 }
  97         }
  98         return resolve_undo;
  99
 100 error:
 101         string_list_clear(resolve_undo, 1);
 102         error("Index records invalid resolve-undo information");
 103         return NULL;
 104 }
 105
 106 void resolve_undo_clear_index(struct index_state *istate)
 107 {
 108         struct string_list *resolve_undo = istate->resolve_undo;
 109         if (!resolve_undo)
 110                 return;
 111         string_list_clear(resolve_undo, 1);
 112         free(resolve_undo);
 113         istate->resolve_undo = NULL;
 114         istate->cache_changed |= RESOLVE_UNDO_CHANGED;
 115 }
 116
 117 int unmerge_index_entry_at(struct index_state *istate, int pos)
 118 {
 119         const struct cache_entry *ce;
 120         struct string_list_item *item;
 121         struct resolve_undo_info *ru;
 122         int i, err = 0, matched;
 123         char *name;
 124
 125         if (!istate->resolve_undo)
 126                 return pos;
 127
 128         ce = istate->cache[pos];
 129         if (ce_stage(ce)) {
 130                 /* already unmerged */
 131                 while ((pos < istate->cache_nr) &&
 132                        ! strcmp(istate->cache[pos]->name, ce->name))
 133                         pos++;
 134                 return pos - 1; /* return the last entry processed */
 135         }
 136         item = string_list_lookup(istate->resolve_undo, ce->name);
 137         if (!item)
 138                 return pos;
 139         ru = item->util;
 140         if (!ru)
 141                 return pos;
 142         matched = ce->ce_flags & CE_MATCHED;
 143         name = xstrdup(ce->name);
 144         remove_index_entry_at(istate, pos);
 145         for (i = 0; i < 3; i++) {
 146                 struct cache_entry *nce;
 147                 if (!ru->mode[i])
 148                         continue;
 149                 nce = make_cache_entry(istate,
 150                                        ru->mode[i],
 151                                        &ru->oid[i],
 152                                        name, i + 1, 0);
 153                 if (matched)
 154                         nce->ce_flags |= CE_MATCHED;
 155                 if (add_index_entry(istate, nce, ADD_CACHE_OK_TO_ADD)) {
 156                         err = 1;
 157                         error("cannot unmerge '%s'", name);
 158                 }
 159         }
 160         free(name);
 161         if (err)
 162                 return pos;
 163         free(ru);
 164         item->util = NULL;
 165         return unmerge_index_entry_at(istate, pos);
 166 }
 167
 168 void unmerge_marked_index(struct index_state *istate)
 169 {
 170         int i;
 171
 172         if (!istate->resolve_undo)
 173                 return;
 174
 175         /* TODO: audit for interaction with sparse-index. */
 176         ensure_full_index(istate);
 177         for (i = 0; i < istate->cache_nr; i++) {
 178                 const struct cache_entry *ce = istate->cache[i];
 179                 if (ce->ce_flags & CE_MATCHED)
 180                         i = unmerge_index_entry_at(istate, i);
 181         }
 182 }
 183
 184 void unmerge_index(struct index_state *istate, const struct pathspec *pathspec)
 185 {
 186         int i;
 187
 188         if (!istate->resolve_undo)
 189                 return;
 190
 191         /* TODO: audit for interaction with sparse-index. */
 192         ensure_full_index(istate);
 193         for (i = 0; i < istate->cache_nr; i++) {
 194                 const struct cache_entry *ce = istate->cache[i];
 195                 if (!ce_path_match(istate, ce, pathspec, NULL))
 196                         continue;
 197                 i = unmerge_index_entry_at(istate, i);
 198         }
 199 }