This gives a thin abstraction between the conflict ID that is a hash
value obtained by inspecting the conflicts and the name of the
directory under $GIT_DIR/rr-cache/, in which the previous resolution
is recorded to be replayed. The plan is to make sure that the
presense of the directory does not imply the presense of a previous
resolution and vice-versa, and later allow us to have more than one
pair of <preimage, postimage> for a given conflict ID.
Signed-off-by: Junio C Hamano <gits...@pobox.com>
---
builtin/rerere.c | 2 +-
rerere.c | 99 +++++++++++++++++++++++++++++++++++++++++---------------
rerere.h | 12 ++++++-
3 files changed, 85 insertions(+), 28 deletions(-)
diff --git a/builtin/rerere.c b/builtin/rerere.c
index 81730bb..fd229a7 100644
--- a/builtin/rerere.c
+++ b/builtin/rerere.c
@@ -103,7 +103,7 @@ int cmd_rerere(int argc, const char **argv, const char
*prefix)
} else if (!strcmp(argv[0], "diff"))
for (i = 0; i < merge_rr.nr; i++) {
const char *path = merge_rr.items[i].string;
- const char *id = (const char *)merge_rr.items[i].util;
+ const struct rerere_id *id = merge_rr.items[i].util;
diff_two(rerere_path(id, "preimage"), path, path, path);
}
else
diff --git a/rerere.c b/rerere.c
index e68469a..469d8a8 100644
--- a/rerere.c
+++ b/rerere.c
@@ -22,17 +22,43 @@ static int rerere_autoupdate;
static char *merge_rr_path;
-const char *rerere_path(const char *id, const char *file)
+static void free_rerere_id(struct string_list_item *item)
{
- return git_path("rr-cache/%s/%s", id, file);
+ free(item->util);
+}
+
+static const char *rerere_id_hex(const struct rerere_id *id)
+{
+ return id->hex;
+}
+
+const char *rerere_path(const struct rerere_id *id, const char *file)
+{
+ if (file)
+ return git_path("rr-cache/%s/%s", rerere_id_hex(id), file);
+ else
+ return git_path("rr-cache/%s", rerere_id_hex(id));
}
-static int has_rerere_resolution(const char *id)
+static int has_rerere_resolution(const struct rerere_id *id)
{
struct stat st;
+
return !stat(rerere_path(id, "postimage"), &st);
}
+static struct rerere_id *new_rerere_id_hex(char *hex)
+{
+ struct rerere_id *id = xmalloc(sizeof(*id));
+ strcpy(id->hex, hex);
+ return id;
+}
+
+static struct rerere_id *new_rerere_id(unsigned char *sha1)
+{
+ return new_rerere_id_hex(sha1_to_hex(sha1));
+}
+
/*
* $GIT_DIR/MERGE_RR file is a collection of records, each of which is
* "conflict ID", a HT and pathname, terminated with a NUL, and is
@@ -50,6 +76,7 @@ static void read_rr(struct string_list *rr)
while (!strbuf_getwholeline(&buf, in, '\0')) {
char *path;
unsigned char sha1[20];
+ struct rerere_id *id;
/* There has to be the hash, tab, path and then NUL */
if (buf.len < 42 || get_sha1_hex(buf.buf, sha1))
@@ -59,8 +86,8 @@ static void read_rr(struct string_list *rr)
die("corrupt MERGE_RR");
buf.buf[40] = '\0';
path = buf.buf + 41;
-
- string_list_insert(rr, path)->util = xstrdup(buf.buf);
+ id = new_rerere_id_hex(buf.buf);
+ string_list_insert(rr, path)->util = id;
}
strbuf_release(&buf);
fclose(in);
@@ -73,12 +100,15 @@ static int write_rr(struct string_list *rr, int out_fd)
int i;
for (i = 0; i < rr->nr; i++) {
struct strbuf buf = STRBUF_INIT;
+ struct rerere_id *id;
assert(rr->items[i].util != RERERE_RESOLVED);
- if (!rr->items[i].util)
+
+ id = rr->items[i].util;
+ if (!id)
continue;
strbuf_addf(&buf, "%s\t%s%c",
- (char *)rr->items[i].util,
+ rerere_id_hex(id),
rr->items[i].string, 0);
if (write_in_full(out_fd, buf.buf, buf.len) != buf.len)
die("unable to write rerere record");
@@ -521,7 +551,7 @@ int rerere_remaining(struct string_list *merge_rr)
struct string_list_item *it;
it = string_list_lookup(merge_rr, (const char
*)e->name);
if (it != NULL) {
- free(it->util);
+ free_rerere_id(it);
it->util = RERERE_RESOLVED;
}
}
@@ -539,7 +569,7 @@ int rerere_remaining(struct string_list *merge_rr)
* Returns 0 for successful replay of recorded resolution, or non-zero
* for failure.
*/
-static int merge(const char *id, const char *path)
+static int merge(const struct rerere_id *id, const char *path)
{
int ret;
mmfile_t cur = {NULL, 0}, base = {NULL, 0}, other = {NULL, 0};
@@ -573,8 +603,8 @@ static int merge(const char *id, const char *path)
*/
if (utime(rerere_path(id, "postimage"), NULL) < 0)
warning("failed utime() on %s: %s",
- rerere_path(id, "postimage"),
- strerror(errno));
+ rerere_path(id, "postimage"),
+ strerror(errno));
/* Update "path" with the resolution */
f = fopen(path, "w");
@@ -631,7 +661,7 @@ static void do_rerere_one_path(struct string_list_item
*rr_item,
struct string_list *update)
{
const char *path = rr_item->string;
- const char *id = (const char *)rr_item->util;
+ const struct rerere_id *id = rr_item->util;
/* Is there a recorded resolution we could attempt to apply? */
if (has_rerere_resolution(id)) {
@@ -651,7 +681,7 @@ static void do_rerere_one_path(struct string_list_item
*rr_item,
} else {
return;
}
- free(rr_item->util);
+ free_rerere_id(rr_item);
rr_item->util = NULL;
}
@@ -670,10 +700,10 @@ static int do_plain_rerere(struct string_list *rr, int fd)
* initial run would catch all and register their preimages.
*/
for (i = 0; i < conflict.nr; i++) {
+ struct rerere_id *id;
unsigned char sha1[20];
- char *id;
- int ret;
const char *path = conflict.items[i].string;
+ int ret;
if (string_list_has_string(rr, path))
continue;
@@ -686,7 +716,8 @@ static int do_plain_rerere(struct string_list *rr, int fd)
ret = handle_file(path, sha1, NULL);
if (ret < 1)
continue;
- id = xstrdup(sha1_to_hex(sha1));
+
+ id = new_rerere_id(sha1);
string_list_insert(rr, path)->util = id;
/*
@@ -697,7 +728,7 @@ static int do_plain_rerere(struct string_list *rr, int fd)
* NEEDSWORK: make sure "gc" does not remove
* preimage without removing the directory.
*/
- if (mkdir_in_gitdir(git_path("rr-cache/%s", id)))
+ if (mkdir_in_gitdir(rerere_path(id, NULL)))
continue;
/*
@@ -779,7 +810,7 @@ int rerere(int flags)
static int rerere_forget_one_path(const char *path, struct string_list *rr)
{
const char *filename;
- char *id;
+ struct rerere_id *id;
unsigned char sha1[20];
int ret;
struct string_list_item *item;
@@ -793,7 +824,7 @@ static int rerere_forget_one_path(const char *path, struct
string_list *rr)
return error("Could not parse conflict hunks in '%s'", path);
/* Nuke the recorded resolution for the conflict */
- id = xstrdup(sha1_to_hex(sha1));
+ id = new_rerere_id(sha1);
filename = rerere_path(id, "postimage");
if (unlink(filename))
return (errno == ENOENT
@@ -813,7 +844,7 @@ static int rerere_forget_one_path(const char *path, struct
string_list *rr)
* conflict when the user is done.
*/
item = string_list_insert(rr, path);
- free(item->util);
+ free_rerere_id(item);
item->util = id;
fprintf(stderr, "Forgot resolution for %s\n", path);
return 0;
@@ -850,22 +881,38 @@ int rerere_forget(struct pathspec *pathspec)
/*
* Garbage collection support
*/
-static time_t rerere_created_at(const char *id)
+
+/*
+ * Note that this is not reentrant but is used only one-at-a-time
+ * so it does not matter right now.
+ */
+static struct rerere_id *dirname_to_id(const char *name)
+{
+ static struct rerere_id id;
+ strcpy(id.hex, name);
+ return &id;
+}
+
+static time_t rerere_created_at(const char *dir_name)
{
struct stat st;
+ struct rerere_id *id = dirname_to_id(dir_name);
+
return stat(rerere_path(id, "preimage"), &st) ? (time_t) 0 :
st.st_mtime;
}
-static time_t rerere_last_used_at(const char *id)
+static time_t rerere_last_used_at(const char *dir_name)
{
struct stat st;
+ struct rerere_id *id = dirname_to_id(dir_name);
+
return stat(rerere_path(id, "postimage"), &st) ? (time_t) 0 :
st.st_mtime;
}
/*
* Remove the recorded resolution for a given conflict ID
*/
-static void unlink_rr_item(const char *id)
+static void unlink_rr_item(struct rerere_id *id)
{
unlink(rerere_path(id, "thisimage"));
unlink(rerere_path(id, "preimage"));
@@ -875,7 +922,7 @@ static void unlink_rr_item(const char *id)
* assume that we already have preimage recorded in
* do_plain_rerere()?
*/
- rmdir(git_path("rr-cache/%s", id));
+ rmdir(rerere_path(id, NULL));
}
void rerere_gc(struct string_list *rr)
@@ -914,7 +961,7 @@ void rerere_gc(struct string_list *rr)
closedir(dir);
/* ... and then remove them one-by-one */
for (i = 0; i < to_remove.nr; i++)
- unlink_rr_item(to_remove.items[i].string);
+ unlink_rr_item(dirname_to_id(to_remove.items[i].string));
string_list_clear(&to_remove, 0);
}
@@ -930,7 +977,7 @@ void rerere_clear(struct string_list *merge_rr)
int i;
for (i = 0; i < merge_rr->nr; i++) {
- const char *id = (const char *)merge_rr->items[i].util;
+ struct rerere_id *id = merge_rr->items[i].util;
if (!has_rerere_resolution(id))
unlink_rr_item(id);
}
diff --git a/rerere.h b/rerere.h
index f998eba..ce545d0 100644
--- a/rerere.h
+++ b/rerere.h
@@ -15,9 +15,19 @@ struct pathspec;
*/
extern void *RERERE_RESOLVED;
+struct rerere_id {
+ char hex[41];
+};
+
extern int setup_rerere(struct string_list *, int);
extern int rerere(int);
-extern const char *rerere_path(const char *id, const char *file);
+/*
+ * Given the conflict ID and the name of a "file" used for replaying
+ * the recorded resolution (e.g. "preimage", "postimage"), return the
+ * path to that filesystem entity. With "file" specified with NULL,
+ * return the path to the directory that houses these files.
+ */
+extern const char *rerere_path(const struct rerere_id *, const char *file);
extern int rerere_forget(struct pathspec *);
extern int rerere_remaining(struct string_list *);
extern void rerere_clear(struct string_list *);
--
2.5.0-rc2-340-g0cccc16
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