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9c5e6c802c
I attempted to make index_state->cache[] a "const struct cache_entry **"
to find out how existing entries in index are modified and where. The
question I have is what do we do if we really need to keep track of on-disk
changes in the index. The result is
- diff-lib.c: setting CE_UPTODATE
- name-hash.c: setting CE_HASHED
- preload-index.c, read-cache.c, unpack-trees.c and
builtin/update-index: obvious
- entry.c: write_entry() may refresh the checked out entry via
fill_stat_cache_info(). This causes "non-const struct cache_entry
*" in builtin/apply.c, builtin/checkout-index.c and
builtin/checkout.c
- builtin/ls-files.c: --with-tree changes stagemask and may set
CE_UPDATE
Of these, write_entry() and its call sites are probably most
interesting because it modifies on-disk info. But this is stat info
and can be retrieved via refresh, at least for porcelain
commands. Other just uses ce_flags for local purposes.
So, keeping track of "dirty" entries is just a matter of setting a
flag in index modification functions exposed by read-cache.c. Except
unpack-trees, the rest of the code base does not do anything funny
behind read-cache's back.
The actual patch is less valueable than the summary above. But if
anyone wants to re-identify the above sites. Applying this patch, then
this:
diff --git a/cache.h b/cache.h
index 430d021..1692891 100644
--- a/cache.h
+++ b/cache.h
@@ -267,7 +267,7 @@ static inline unsigned int canon_mode(unsigned int mode)
#define cache_entry_size(len) (offsetof(struct cache_entry,name) + (len) + 1)
struct index_state {
- struct cache_entry **cache;
+ const struct cache_entry **cache;
unsigned int version;
unsigned int cache_nr, cache_alloc, cache_changed;
struct string_list *resolve_undo;
will help quickly identify them without bogus warnings.
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
189 lines
4.3 KiB
C
189 lines
4.3 KiB
C
#include "cache.h"
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#include "dir.h"
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#include "resolve-undo.h"
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#include "string-list.h"
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/* The only error case is to run out of memory in string-list */
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void record_resolve_undo(struct index_state *istate, struct cache_entry *ce)
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{
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struct string_list_item *lost;
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struct resolve_undo_info *ui;
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struct string_list *resolve_undo;
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int stage = ce_stage(ce);
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if (!stage)
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return;
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if (!istate->resolve_undo) {
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resolve_undo = xcalloc(1, sizeof(*resolve_undo));
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resolve_undo->strdup_strings = 1;
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istate->resolve_undo = resolve_undo;
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}
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resolve_undo = istate->resolve_undo;
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lost = string_list_insert(resolve_undo, ce->name);
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if (!lost->util)
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lost->util = xcalloc(1, sizeof(*ui));
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ui = lost->util;
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hashcpy(ui->sha1[stage - 1], ce->sha1);
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ui->mode[stage - 1] = ce->ce_mode;
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}
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void resolve_undo_write(struct strbuf *sb, struct string_list *resolve_undo)
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{
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struct string_list_item *item;
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for_each_string_list_item(item, resolve_undo) {
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struct resolve_undo_info *ui = item->util;
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int i;
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if (!ui)
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continue;
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strbuf_addstr(sb, item->string);
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strbuf_addch(sb, 0);
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for (i = 0; i < 3; i++)
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strbuf_addf(sb, "%o%c", ui->mode[i], 0);
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for (i = 0; i < 3; i++) {
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if (!ui->mode[i])
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continue;
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strbuf_add(sb, ui->sha1[i], 20);
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}
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}
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}
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struct string_list *resolve_undo_read(const char *data, unsigned long size)
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{
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struct string_list *resolve_undo;
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size_t len;
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char *endptr;
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int i;
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resolve_undo = xcalloc(1, sizeof(*resolve_undo));
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resolve_undo->strdup_strings = 1;
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while (size) {
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struct string_list_item *lost;
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struct resolve_undo_info *ui;
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len = strlen(data) + 1;
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if (size <= len)
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goto error;
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lost = string_list_insert(resolve_undo, data);
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if (!lost->util)
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lost->util = xcalloc(1, sizeof(*ui));
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ui = lost->util;
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size -= len;
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data += len;
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for (i = 0; i < 3; i++) {
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ui->mode[i] = strtoul(data, &endptr, 8);
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if (!endptr || endptr == data || *endptr)
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goto error;
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len = (endptr + 1) - (char*)data;
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if (size <= len)
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goto error;
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size -= len;
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data += len;
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}
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for (i = 0; i < 3; i++) {
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if (!ui->mode[i])
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continue;
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if (size < 20)
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goto error;
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hashcpy(ui->sha1[i], (const unsigned char *)data);
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size -= 20;
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data += 20;
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}
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}
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return resolve_undo;
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error:
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string_list_clear(resolve_undo, 1);
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error("Index records invalid resolve-undo information");
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return NULL;
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}
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void resolve_undo_clear_index(struct index_state *istate)
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{
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struct string_list *resolve_undo = istate->resolve_undo;
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if (!resolve_undo)
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return;
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string_list_clear(resolve_undo, 1);
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free(resolve_undo);
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istate->resolve_undo = NULL;
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istate->cache_changed = 1;
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}
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int unmerge_index_entry_at(struct index_state *istate, int pos)
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{
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const struct cache_entry *ce;
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struct string_list_item *item;
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struct resolve_undo_info *ru;
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int i, err = 0, matched;
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if (!istate->resolve_undo)
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return pos;
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ce = istate->cache[pos];
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if (ce_stage(ce)) {
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/* already unmerged */
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while ((pos < istate->cache_nr) &&
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! strcmp(istate->cache[pos]->name, ce->name))
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pos++;
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return pos - 1; /* return the last entry processed */
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}
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item = string_list_lookup(istate->resolve_undo, ce->name);
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if (!item)
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return pos;
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ru = item->util;
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if (!ru)
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return pos;
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matched = ce->ce_flags & CE_MATCHED;
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remove_index_entry_at(istate, pos);
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for (i = 0; i < 3; i++) {
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struct cache_entry *nce;
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if (!ru->mode[i])
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continue;
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nce = make_cache_entry(ru->mode[i], ru->sha1[i],
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ce->name, i + 1, 0);
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if (matched)
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nce->ce_flags |= CE_MATCHED;
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if (add_index_entry(istate, nce, ADD_CACHE_OK_TO_ADD)) {
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err = 1;
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error("cannot unmerge '%s'", ce->name);
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}
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}
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if (err)
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return pos;
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free(ru);
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item->util = NULL;
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return unmerge_index_entry_at(istate, pos);
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}
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void unmerge_marked_index(struct index_state *istate)
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{
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int i;
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if (!istate->resolve_undo)
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return;
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for (i = 0; i < istate->cache_nr; i++) {
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const struct cache_entry *ce = istate->cache[i];
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if (ce->ce_flags & CE_MATCHED)
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i = unmerge_index_entry_at(istate, i);
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}
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}
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void unmerge_index(struct index_state *istate, const char **pathspec)
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{
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int i;
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if (!istate->resolve_undo)
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return;
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for (i = 0; i < istate->cache_nr; i++) {
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const struct cache_entry *ce = istate->cache[i];
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if (!match_pathspec(pathspec, ce->name, ce_namelen(ce), 0, NULL))
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continue;
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i = unmerge_index_entry_at(istate, i);
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}
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}
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