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                 resolve_undo = xcalloc(1, sizeof(*resolve_undo));
  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         hashcpy(ui->sha1[stage - 1], ce->sha1);
  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->sha1[i], 20);
  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
  59         resolve_undo = xcalloc(1, sizeof(*resolve_undo));
  60         resolve_undo->strdup_strings = 1;
  61
  62         while (size) {
  63                 struct string_list_item *lost;
  64                 struct resolve_undo_info *ui;
  65
  66                 len = strlen(data) + 1;
  67                 if (size <= len)
  68                         goto error;
  69                 lost = string_list_insert(resolve_undo, data);
  70                 if (!lost->util)
  71                         lost->util = xcalloc(1, sizeof(*ui));
  72                 ui = lost->util;
  73                 size -= len;
  74                 data += len;
  75
  76                 for (i = 0; i < 3; i++) {
  77                         ui->mode[i] = strtoul(data, &endptr, 8);
  78                         if (!endptr || endptr == data || *endptr)
  79                                 goto error;
  80                         len = (endptr + 1) - (char*)data;
  81                         if (size <= len)
  82                                 goto error;
  83                         size -= len;
  84                         data += len;
  85                 }
  86
  87                 for (i = 0; i < 3; i++) {
  88                         if (!ui->mode[i])
  89                                 continue;
  90                         if (size < 20)
  91                                 goto error;
  92                         hashcpy(ui->sha1[i], (const unsigned char *)data);
  93                         size -= 20;
  94                         data += 20;
  95                 }
  96         }
  97         return resolve_undo;
  98
  99 error:
 100         string_list_clear(resolve_undo, 1);
 101         error("Index records invalid resolve-undo information");
 102         return NULL;
 103 }
 104
 105 void resolve_undo_clear_index(struct index_state *istate)
 106 {
 107         struct string_list *resolve_undo = istate->resolve_undo;
 108         if (!resolve_undo)
 109                 return;
 110         string_list_clear(resolve_undo, 1);
 111         free(resolve_undo);
 112         istate->resolve_undo = NULL;
 113         istate->cache_changed = 1;
 114 }
 115
 116 int unmerge_index_entry_at(struct index_state *istate, int pos)
 117 {
 118         struct cache_entry *ce;
 119         struct string_list_item *item;
 120         struct resolve_undo_info *ru;
 121         int i, err = 0;
 122
 123         if (!istate->resolve_undo)
 124                 return pos;
 125
 126         ce = istate->cache[pos];
 127         if (ce_stage(ce)) {
 128                 /* already unmerged */
 129                 while ((pos < istate->cache_nr) &&
 130                        ! strcmp(istate->cache[pos]->name, ce->name))
 131                         pos++;
 132                 return pos - 1; /* return the last entry processed */
 133         }
 134         item = string_list_lookup(istate->resolve_undo, ce->name);
 135         if (!item)
 136                 return pos;
 137         ru = item->util;
 138         if (!ru)
 139                 return pos;
 140         remove_index_entry_at(istate, pos);
 141         for (i = 0; i < 3; i++) {
 142                 struct cache_entry *nce;
 143                 if (!ru->mode[i])
 144                         continue;
 145                 nce = make_cache_entry(ru->mode[i], ru->sha1[i],
 146                                        ce->name, i + 1, 0);
 147                 if (add_index_entry(istate, nce, ADD_CACHE_OK_TO_ADD)) {
 148                         err = 1;
 149                         error("cannot unmerge '%s'", ce->name);
 150                 }
 151         }
 152         if (err)
 153                 return pos;
 154         free(ru);
 155         item->util = NULL;
 156         return unmerge_index_entry_at(istate, pos);
 157 }
 158
 159 void unmerge_index(struct index_state *istate, const char **pathspec)
 160 {
 161         int i;
 162
 163         if (!istate->resolve_undo)
 164                 return;
 165
 166         for (i = 0; i < istate->cache_nr; i++) {
 167                 struct cache_entry *ce = istate->cache[i];
 168                 if (!match_pathspec(pathspec, ce->name, ce_namelen(ce), 0, NULL))
 169                         continue;
 170                 i = unmerge_index_entry_at(istate, i);
 171         }
 172 }