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authorJunio C Hamano <gitster@pobox.com>2009-12-25 00:30:51 -0800
committerJunio C Hamano <gitster@pobox.com>2009-12-25 17:10:10 -0800
commitcfc5789ada444423232fa1533f401b5972eb3f6c (patch)
tree8a2ecdd8e946c0766d276d69b0d0693dffa1837a /resolve-undo.c
parentbe6ff8196d9890c1875a75b96320b863dd1fe815 (diff)
downloadgit-cfc5789ada444423232fa1533f401b5972eb3f6c.tar.gz
resolve-undo: record resolved conflicts in a new index extension section
When resolving a conflict using "git add" to create a stage #0 entry, or "git rm" to remove entries at higher stages, remove_index_entry_at() function is eventually called to remove unmerged (i.e. higher stage) entries from the index. Introduce a "resolve_undo_info" structure and keep track of the removed cache entries, and save it in a new index extension section in the index_state. Operations like "read-tree -m", "merge", "checkout [-m] <branch>" and "reset" are signs that recorded information in the index is no longer necessary. The data is removed from the index extension when operations start; they may leave conflicted entries in the index, and later user actions like "git add" will record their conflicted states afresh. Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 'resolve-undo.c')
-rw-r--r--resolve-undo.c117
1 files changed, 117 insertions, 0 deletions
diff --git a/resolve-undo.c b/resolve-undo.c
new file mode 100644
index 0000000000..86e8547ca2
--- /dev/null
+++ b/resolve-undo.c
@@ -0,0 +1,117 @@
+#include "cache.h"
+#include "resolve-undo.h"
+#include "string-list.h"
+
+/* The only error case is to run out of memory in string-list */
+void record_resolve_undo(struct index_state *istate, struct cache_entry *ce)
+{
+ struct string_list_item *lost;
+ struct resolve_undo_info *ui;
+ struct string_list *resolve_undo;
+ int stage = ce_stage(ce);
+
+ if (!stage)
+ return;
+
+ if (!istate->resolve_undo) {
+ resolve_undo = xcalloc(1, sizeof(*resolve_undo));
+ resolve_undo->strdup_strings = 1;
+ istate->resolve_undo = resolve_undo;
+ }
+ resolve_undo = istate->resolve_undo;
+ lost = string_list_insert(ce->name, resolve_undo);
+ if (!lost->util)
+ lost->util = xcalloc(1, sizeof(*ui));
+ ui = lost->util;
+ hashcpy(ui->sha1[stage - 1], ce->sha1);
+ ui->mode[stage - 1] = ce->ce_mode;
+}
+
+static int write_one(struct string_list_item *item, void *cbdata)
+{
+ struct strbuf *sb = cbdata;
+ struct resolve_undo_info *ui = item->util;
+ int i;
+
+ if (!ui)
+ return 0;
+ strbuf_addstr(sb, item->string);
+ strbuf_addch(sb, 0);
+ for (i = 0; i < 3; i++)
+ strbuf_addf(sb, "%o%c", ui->mode[i], 0);
+ for (i = 0; i < 3; i++) {
+ if (!ui->mode[i])
+ continue;
+ strbuf_add(sb, ui->sha1[i], 20);
+ }
+ return 0;
+}
+
+void resolve_undo_write(struct strbuf *sb, struct string_list *resolve_undo)
+{
+ for_each_string_list(write_one, resolve_undo, sb);
+}
+
+struct string_list *resolve_undo_read(void *data, unsigned long size)
+{
+ struct string_list *resolve_undo;
+ size_t len;
+ char *endptr;
+ int i;
+
+ resolve_undo = xcalloc(1, sizeof(*resolve_undo));
+ resolve_undo->strdup_strings = 1;
+
+ while (size) {
+ struct string_list_item *lost;
+ struct resolve_undo_info *ui;
+
+ len = strlen(data) + 1;
+ if (size <= len)
+ goto error;
+ lost = string_list_insert(data, resolve_undo);
+ if (!lost->util)
+ lost->util = xcalloc(1, sizeof(*ui));
+ ui = lost->util;
+ size -= len;
+ data += len;
+
+ for (i = 0; i < 3; i++) {
+ ui->mode[i] = strtoul(data, &endptr, 8);
+ if (!endptr || endptr == data || *endptr)
+ goto error;
+ len = (endptr + 1) - (char*)data;
+ if (size <= len)
+ goto error;
+ size -= len;
+ data += len;
+ }
+
+ for (i = 0; i < 3; i++) {
+ if (!ui->mode[i])
+ continue;
+ if (size < 20)
+ goto error;
+ hashcpy(ui->sha1[i], data);
+ size -= 20;
+ data += 20;
+ }
+ }
+ return resolve_undo;
+
+error:
+ string_list_clear(resolve_undo, 1);
+ error("Index records invalid resolve-undo information");
+ return NULL;
+}
+
+void resolve_undo_clear_index(struct index_state *istate)
+{
+ struct string_list *resolve_undo = istate->resolve_undo;
+ if (!resolve_undo)
+ return;
+ string_list_clear(resolve_undo, 1);
+ free(resolve_undo);
+ istate->resolve_undo = NULL;
+ istate->cache_changed = 1;
+}