#include "cache.h"
#include "string-list.h"
#include "rerere.h"
-#include "xdiff/xdiff.h"
#include "xdiff-interface.h"
+#include "dir.h"
+#include "resolve-undo.h"
+#include "ll-merge.h"
+#include "attr.h"
+
+#define RESOLVED 0
+#define PUNTED 1
+#define THREE_STAGED 2
+void *RERERE_RESOLVED = &RERERE_RESOLVED;
/* if rerere_enabled == -1, fall back to detection of .git/rr-cache */
static int rerere_enabled = -1;
static char *merge_rr_path;
-static const char *rr_path(const char *name, const char *file)
+const char *rerere_path(const char *hex, const char *file)
{
- return git_path("rr-cache/%s/%s", name, file);
+ return git_path("rr-cache/%s/%s", hex, file);
}
-static int has_resolution(const char *name)
+int has_rerere_resolution(const char *hex)
{
struct stat st;
- return !stat(rr_path(name, "postimage"), &st);
+ return !stat(rerere_path(hex, "postimage"), &st);
}
static void read_rr(struct string_list *rr)
name = xstrdup(buf);
if (fgetc(in) != '\t')
die("corrupt MERGE_RR");
- for (i = 0; i < sizeof(buf) && (buf[i] = fgetc(in)); i++)
- ; /* do nothing */
+ for (i = 0; i < sizeof(buf); i++) {
+ int c = fgetc(in);
+ if (c < 0)
+ die("corrupt MERGE_RR");
+ buf[i] = c;
+ if (c == 0)
+ break;
+ }
if (i == sizeof(buf))
die("filename too long");
- string_list_insert(buf, rr)->util = name;
+ string_list_insert(rr, buf)->util = name;
}
fclose(in);
}
path = rr->items[i].string;
length = strlen(path) + 1;
if (write_in_full(out_fd, rr->items[i].util, 40) != 40 ||
- write_in_full(out_fd, "\t", 1) != 1 ||
+ write_str_in_full(out_fd, "\t") != 1 ||
write_in_full(out_fd, path, length) != length)
die("unable to write rerere record");
}
return 0;
}
-static int handle_file(const char *path,
- unsigned char *sha1, const char *output)
+static void ferr_write(const void *p, size_t count, FILE *fp, int *err)
{
- SHA_CTX ctx;
- char buf[1024];
- int hunk = 0, hunk_no = 0;
- struct strbuf one, two;
- FILE *f = fopen(path, "r");
- FILE *out = NULL;
+ if (!count || *err)
+ return;
+ if (fwrite(p, count, 1, fp) != 1)
+ *err = errno;
+}
- if (!f)
- return error("Could not open %s", path);
+static inline void ferr_puts(const char *s, FILE *fp, int *err)
+{
+ ferr_write(s, strlen(s), fp, err);
+}
- if (output) {
- out = fopen(output, "w");
- if (!out) {
- fclose(f);
- return error("Could not write %s", output);
+struct rerere_io {
+ int (*getline)(struct strbuf *, struct rerere_io *);
+ FILE *output;
+ int wrerror;
+ /* some more stuff */
+};
+
+static void rerere_io_putstr(const char *str, struct rerere_io *io)
+{
+ if (io->output)
+ ferr_puts(str, io->output, &io->wrerror);
+}
+
+static void rerere_io_putconflict(int ch, int size, struct rerere_io *io)
+{
+ char buf[64];
+
+ while (size) {
+ if (size < sizeof(buf) - 2) {
+ memset(buf, ch, size);
+ buf[size] = '\n';
+ buf[size + 1] = '\0';
+ size = 0;
+ } else {
+ int sz = sizeof(buf) - 1;
+ if (size <= sz)
+ sz -= (sz - size) + 1;
+ memset(buf, ch, sz);
+ buf[sz] = '\0';
+ size -= sz;
}
+ rerere_io_putstr(buf, io);
}
+}
+
+static void rerere_io_putmem(const char *mem, size_t sz, struct rerere_io *io)
+{
+ if (io->output)
+ ferr_write(mem, sz, io->output, &io->wrerror);
+}
+
+struct rerere_io_file {
+ struct rerere_io io;
+ FILE *input;
+};
+
+static int rerere_file_getline(struct strbuf *sb, struct rerere_io *io_)
+{
+ struct rerere_io_file *io = (struct rerere_io_file *)io_;
+ return strbuf_getwholeline(sb, io->input, '\n');
+}
+
+static int is_cmarker(char *buf, int marker_char, int marker_size, int want_sp)
+{
+ while (marker_size--)
+ if (*buf++ != marker_char)
+ return 0;
+ if (want_sp && *buf != ' ')
+ return 0;
+ return isspace(*buf);
+}
+
+static int handle_path(unsigned char *sha1, struct rerere_io *io, int marker_size)
+{
+ git_SHA_CTX ctx;
+ int hunk_no = 0;
+ enum {
+ RR_CONTEXT = 0, RR_SIDE_1, RR_SIDE_2, RR_ORIGINAL
+ } hunk = RR_CONTEXT;
+ struct strbuf one = STRBUF_INIT, two = STRBUF_INIT;
+ struct strbuf buf = STRBUF_INIT;
if (sha1)
- SHA1_Init(&ctx);
+ git_SHA1_Init(&ctx);
- strbuf_init(&one, 0);
- strbuf_init(&two, 0);
- while (fgets(buf, sizeof(buf), f)) {
- if (!prefixcmp(buf, "<<<<<<< ")) {
- if (hunk)
+ while (!io->getline(&buf, io)) {
+ if (is_cmarker(buf.buf, '<', marker_size, 1)) {
+ if (hunk != RR_CONTEXT)
goto bad;
- hunk = 1;
- } else if (!prefixcmp(buf, "=======") && isspace(buf[7])) {
- if (hunk != 1)
+ hunk = RR_SIDE_1;
+ } else if (is_cmarker(buf.buf, '|', marker_size, 0)) {
+ if (hunk != RR_SIDE_1)
goto bad;
- hunk = 2;
- } else if (!prefixcmp(buf, ">>>>>>> ")) {
- if (hunk != 2)
+ hunk = RR_ORIGINAL;
+ } else if (is_cmarker(buf.buf, '=', marker_size, 0)) {
+ if (hunk != RR_SIDE_1 && hunk != RR_ORIGINAL)
+ goto bad;
+ hunk = RR_SIDE_2;
+ } else if (is_cmarker(buf.buf, '>', marker_size, 1)) {
+ if (hunk != RR_SIDE_2)
goto bad;
if (strbuf_cmp(&one, &two) > 0)
strbuf_swap(&one, &two);
hunk_no++;
- hunk = 0;
- if (out) {
- fputs("<<<<<<<\n", out);
- fwrite(one.buf, one.len, 1, out);
- fputs("=======\n", out);
- fwrite(two.buf, two.len, 1, out);
- fputs(">>>>>>>\n", out);
- }
+ hunk = RR_CONTEXT;
+ rerere_io_putconflict('<', marker_size, io);
+ rerere_io_putmem(one.buf, one.len, io);
+ rerere_io_putconflict('=', marker_size, io);
+ rerere_io_putmem(two.buf, two.len, io);
+ rerere_io_putconflict('>', marker_size, io);
if (sha1) {
- SHA1_Update(&ctx, one.buf ? one.buf : "",
+ git_SHA1_Update(&ctx, one.buf ? one.buf : "",
one.len + 1);
- SHA1_Update(&ctx, two.buf ? two.buf : "",
+ git_SHA1_Update(&ctx, two.buf ? two.buf : "",
two.len + 1);
}
strbuf_reset(&one);
strbuf_reset(&two);
- } else if (hunk == 1)
- strbuf_addstr(&one, buf);
- else if (hunk == 2)
- strbuf_addstr(&two, buf);
- else if (out)
- fputs(buf, out);
+ } else if (hunk == RR_SIDE_1)
+ strbuf_addstr(&one, buf.buf);
+ else if (hunk == RR_ORIGINAL)
+ ; /* discard */
+ else if (hunk == RR_SIDE_2)
+ strbuf_addstr(&two, buf.buf);
+ else
+ rerere_io_putstr(buf.buf, io);
continue;
bad:
hunk = 99; /* force error exit */
}
strbuf_release(&one);
strbuf_release(&two);
+ strbuf_release(&buf);
- fclose(f);
- if (out)
- fclose(out);
if (sha1)
- SHA1_Final(sha1, &ctx);
- if (hunk) {
+ git_SHA1_Final(sha1, &ctx);
+ if (hunk != RR_CONTEXT)
+ return -1;
+ return hunk_no;
+}
+
+static int handle_file(const char *path, unsigned char *sha1, const char *output)
+{
+ int hunk_no = 0;
+ struct rerere_io_file io;
+ int marker_size = ll_merge_marker_size(path);
+
+ memset(&io, 0, sizeof(io));
+ io.io.getline = rerere_file_getline;
+ io.input = fopen(path, "r");
+ io.io.wrerror = 0;
+ if (!io.input)
+ return error("Could not open %s", path);
+
+ if (output) {
+ io.io.output = fopen(output, "w");
+ if (!io.io.output) {
+ fclose(io.input);
+ return error("Could not write %s", output);
+ }
+ }
+
+ hunk_no = handle_path(sha1, (struct rerere_io *)&io, marker_size);
+
+ fclose(io.input);
+ if (io.io.wrerror)
+ error("There were errors while writing %s (%s)",
+ path, strerror(io.io.wrerror));
+ if (io.io.output && fclose(io.io.output))
+ io.io.wrerror = error("Failed to flush %s: %s",
+ path, strerror(errno));
+
+ if (hunk_no < 0) {
if (output)
- unlink(output);
+ unlink_or_warn(output);
return error("Could not parse conflict hunks in %s", path);
}
+ if (io.io.wrerror)
+ return -1;
return hunk_no;
}
-static int find_conflict(struct string_list *conflict)
+struct rerere_io_mem {
+ struct rerere_io io;
+ struct strbuf input;
+};
+
+static int rerere_mem_getline(struct strbuf *sb, struct rerere_io *io_)
{
- int i;
- if (read_cache() < 0)
- return error("Could not read index");
- for (i = 0; i+1 < active_nr; i++) {
+ struct rerere_io_mem *io = (struct rerere_io_mem *)io_;
+ char *ep;
+ size_t len;
+
+ strbuf_release(sb);
+ if (!io->input.len)
+ return -1;
+ ep = strchrnul(io->input.buf, '\n');
+ if (*ep == '\n')
+ ep++;
+ len = ep - io->input.buf;
+ strbuf_add(sb, io->input.buf, len);
+ strbuf_remove(&io->input, 0, len);
+ return 0;
+}
+
+static int handle_cache(const char *path, unsigned char *sha1, const char *output)
+{
+ mmfile_t mmfile[3];
+ mmbuffer_t result = {NULL, 0};
+ struct cache_entry *ce;
+ int pos, len, i, hunk_no;
+ struct rerere_io_mem io;
+ int marker_size = ll_merge_marker_size(path);
+
+ /*
+ * Reproduce the conflicted merge in-core
+ */
+ len = strlen(path);
+ pos = cache_name_pos(path, len);
+ if (0 <= pos)
+ return -1;
+ pos = -pos - 1;
+
+ for (i = 0; i < 3; i++) {
+ enum object_type type;
+ unsigned long size;
+
+ mmfile[i].size = 0;
+ mmfile[i].ptr = NULL;
+ if (active_nr <= pos)
+ break;
+ ce = active_cache[pos++];
+ if (ce_namelen(ce) != len || memcmp(ce->name, path, len)
+ || ce_stage(ce) != i + 1)
+ break;
+ mmfile[i].ptr = read_sha1_file(ce->sha1, &type, &size);
+ mmfile[i].size = size;
+ }
+ for (i = 0; i < 3; i++) {
+ if (!mmfile[i].ptr && !mmfile[i].size)
+ mmfile[i].ptr = xstrdup("");
+ }
+ /*
+ * NEEDSWORK: handle conflicts from merges with
+ * merge.renormalize set, too
+ */
+ ll_merge(&result, path, &mmfile[0], NULL,
+ &mmfile[1], "ours",
+ &mmfile[2], "theirs", NULL);
+ for (i = 0; i < 3; i++)
+ free(mmfile[i].ptr);
+
+ memset(&io, 0, sizeof(io));
+ io.io.getline = rerere_mem_getline;
+ if (output)
+ io.io.output = fopen(output, "w");
+ else
+ io.io.output = NULL;
+ strbuf_init(&io.input, 0);
+ strbuf_attach(&io.input, result.ptr, result.size, result.size);
+
+ hunk_no = handle_path(sha1, (struct rerere_io *)&io, marker_size);
+ strbuf_release(&io.input);
+ if (io.io.output)
+ fclose(io.io.output);
+ return hunk_no;
+}
+
+static int check_one_conflict(int i, int *type)
+{
+ struct cache_entry *e = active_cache[i];
+
+ if (!ce_stage(e)) {
+ *type = RESOLVED;
+ return i + 1;
+ }
+
+ *type = PUNTED;
+ if (ce_stage(e) == 1) {
+ if (active_nr <= ++i)
+ return i + 1;
+ }
+
+ /* Only handle regular files with both stages #2 and #3 */
+ if (i + 1 < active_nr) {
struct cache_entry *e2 = active_cache[i];
- struct cache_entry *e3 = active_cache[i+1];
+ struct cache_entry *e3 = active_cache[i + 1];
if (ce_stage(e2) == 2 &&
ce_stage(e3) == 3 &&
- ce_same_name(e2, e3) &&
+ ce_same_name(e, e3) &&
S_ISREG(e2->ce_mode) &&
- S_ISREG(e3->ce_mode)) {
- string_list_insert((const char *)e2->name, conflict);
- i++; /* skip over both #2 and #3 */
+ S_ISREG(e3->ce_mode))
+ *type = THREE_STAGED;
+ }
+
+ /* Skip the entries with the same name */
+ while (i < active_nr && ce_same_name(e, active_cache[i]))
+ i++;
+ return i;
+}
+
+static int find_conflict(struct string_list *conflict)
+{
+ int i;
+ if (read_cache() < 0)
+ return error("Could not read index");
+
+ for (i = 0; i < active_nr;) {
+ int conflict_type;
+ struct cache_entry *e = active_cache[i];
+ i = check_one_conflict(i, &conflict_type);
+ if (conflict_type == THREE_STAGED)
+ string_list_insert(conflict, (const char *)e->name);
+ }
+ return 0;
+}
+
+int rerere_remaining(struct string_list *merge_rr)
+{
+ int i;
+ if (read_cache() < 0)
+ return error("Could not read index");
+
+ for (i = 0; i < active_nr;) {
+ int conflict_type;
+ struct cache_entry *e = active_cache[i];
+ i = check_one_conflict(i, &conflict_type);
+ if (conflict_type == PUNTED)
+ string_list_insert(merge_rr, (const char *)e->name);
+ else if (conflict_type == RESOLVED) {
+ struct string_list_item *it;
+ it = string_list_lookup(merge_rr, (const char *)e->name);
+ if (it != NULL) {
+ free(it->util);
+ it->util = RERERE_RESOLVED;
+ }
}
}
return 0;
static int merge(const char *name, const char *path)
{
int ret;
- mmfile_t cur, base, other;
+ mmfile_t cur = {NULL, 0}, base = {NULL, 0}, other = {NULL, 0};
mmbuffer_t result = {NULL, 0};
- xpparam_t xpp = {XDF_NEED_MINIMAL};
- if (handle_file(path, NULL, rr_path(name, "thisimage")) < 0)
+ if (handle_file(path, NULL, rerere_path(name, "thisimage")) < 0)
return 1;
- if (read_mmfile(&cur, rr_path(name, "thisimage")) ||
- read_mmfile(&base, rr_path(name, "preimage")) ||
- read_mmfile(&other, rr_path(name, "postimage")))
- return 1;
- ret = xdl_merge(&base, &cur, "", &other, "",
- &xpp, XDL_MERGE_ZEALOUS, &result);
+ if (read_mmfile(&cur, rerere_path(name, "thisimage")) ||
+ read_mmfile(&base, rerere_path(name, "preimage")) ||
+ read_mmfile(&other, rerere_path(name, "postimage"))) {
+ ret = 1;
+ goto out;
+ }
+ ret = ll_merge(&result, path, &base, NULL, &cur, "", &other, "", NULL);
if (!ret) {
- FILE *f = fopen(path, "w");
+ FILE *f;
+
+ if (utime(rerere_path(name, "postimage"), NULL) < 0)
+ warning("failed utime() on %s: %s",
+ rerere_path(name, "postimage"),
+ strerror(errno));
+ f = fopen(path, "w");
if (!f)
- return error("Could not write to %s", path);
- fwrite(result.ptr, result.size, 1, f);
- fclose(f);
+ return error("Could not open %s: %s", path,
+ strerror(errno));
+ if (fwrite(result.ptr, result.size, 1, f) != 1)
+ error("Could not write %s: %s", path, strerror(errno));
+ if (fclose(f))
+ return error("Writing %s failed: %s", path,
+ strerror(errno));
}
+out:
free(cur.ptr);
free(base.ptr);
free(other.ptr);
static int do_plain_rerere(struct string_list *rr, int fd)
{
- struct string_list conflict = { NULL, 0, 0, 1 };
- struct string_list update = { NULL, 0, 0, 1 };
+ struct string_list conflict = STRING_LIST_INIT_DUP;
+ struct string_list update = STRING_LIST_INIT_DUP;
int i;
find_conflict(&conflict);
if (ret < 1)
continue;
hex = xstrdup(sha1_to_hex(sha1));
- string_list_insert(path, rr)->util = hex;
+ string_list_insert(rr, path)->util = hex;
if (mkdir(git_path("rr-cache/%s", hex), 0755))
- continue;;
- handle_file(path, NULL, rr_path(hex, "preimage"));
+ continue;
+ handle_file(path, NULL, rerere_path(hex, "preimage"));
fprintf(stderr, "Recorded preimage for '%s'\n", path);
}
}
const char *path = rr->items[i].string;
const char *name = (const char *)rr->items[i].util;
- if (has_resolution(name)) {
+ if (has_rerere_resolution(name)) {
if (!merge(name, path)) {
if (rerere_autoupdate)
- string_list_insert(path, &update);
+ string_list_insert(&update, path);
fprintf(stderr,
"%s '%s' using previous resolution.\n",
rerere_autoupdate
continue;
fprintf(stderr, "Recorded resolution for '%s'.\n", path);
- copy_file(rr_path(name, "postimage"), path, 0666);
+ copy_file(rerere_path(name, "postimage"), path, 0666);
mark_resolved:
rr->items[i].util = NULL;
}
static int is_rerere_enabled(void)
{
- struct stat st;
const char *rr_cache;
int rr_cache_exists;
return 0;
rr_cache = git_path("rr-cache");
- rr_cache_exists = !stat(rr_cache, &st) && S_ISDIR(st.st_mode);
+ rr_cache_exists = is_directory(rr_cache);
if (rerere_enabled < 0)
return rr_cache_exists;
- if (!rr_cache_exists &&
- (mkdir(rr_cache, 0777) || adjust_shared_perm(rr_cache)))
+ if (!rr_cache_exists && mkdir_in_gitdir(rr_cache))
die("Could not create directory %s", rr_cache);
return 1;
}
-int setup_rerere(struct string_list *merge_rr)
+int setup_rerere(struct string_list *merge_rr, int flags)
{
int fd;
if (!is_rerere_enabled())
return -1;
- merge_rr_path = xstrdup(git_path("MERGE_RR"));
- fd = hold_lock_file_for_update(&write_lock, merge_rr_path, 1);
+ if (flags & (RERERE_AUTOUPDATE|RERERE_NOAUTOUPDATE))
+ rerere_autoupdate = !!(flags & RERERE_AUTOUPDATE);
+ merge_rr_path = git_pathdup("MERGE_RR");
+ fd = hold_lock_file_for_update(&write_lock, merge_rr_path,
+ LOCK_DIE_ON_ERROR);
read_rr(merge_rr);
return fd;
}
-int rerere(void)
+int rerere(int flags)
{
- struct string_list merge_rr = { NULL, 0, 0, 1 };
+ struct string_list merge_rr = STRING_LIST_INIT_DUP;
int fd;
- fd = setup_rerere(&merge_rr);
+ fd = setup_rerere(&merge_rr, flags);
if (fd < 0)
return 0;
return do_plain_rerere(&merge_rr, fd);
}
+
+static int rerere_forget_one_path(const char *path, struct string_list *rr)
+{
+ const char *filename;
+ char *hex;
+ unsigned char sha1[20];
+ int ret;
+
+ ret = handle_cache(path, sha1, NULL);
+ if (ret < 1)
+ return error("Could not parse conflict hunks in '%s'", path);
+ hex = xstrdup(sha1_to_hex(sha1));
+ filename = rerere_path(hex, "postimage");
+ if (unlink(filename))
+ return (errno == ENOENT
+ ? error("no remembered resolution for %s", path)
+ : error("cannot unlink %s: %s", filename, strerror(errno)));
+
+ handle_cache(path, sha1, rerere_path(hex, "preimage"));
+ fprintf(stderr, "Updated preimage for '%s'\n", path);
+
+
+ string_list_insert(rr, path)->util = hex;
+ fprintf(stderr, "Forgot resolution for %s\n", path);
+ return 0;
+}
+
+int rerere_forget(const char **pathspec)
+{
+ int i, fd;
+ struct string_list conflict = STRING_LIST_INIT_DUP;
+ struct string_list merge_rr = STRING_LIST_INIT_DUP;
+
+ if (read_cache() < 0)
+ return error("Could not read index");
+
+ fd = setup_rerere(&merge_rr, RERERE_NOAUTOUPDATE);
+
+ unmerge_cache(pathspec);
+ find_conflict(&conflict);
+ for (i = 0; i < conflict.nr; i++) {
+ struct string_list_item *it = &conflict.items[i];
+ if (!match_pathspec(pathspec, it->string, strlen(it->string),
+ 0, NULL))
+ continue;
+ rerere_forget_one_path(it->string, &merge_rr);
+ }
+ return write_rr(&merge_rr, fd);
+}
+
+static time_t rerere_created_at(const char *name)
+{
+ struct stat st;
+ return stat(rerere_path(name, "preimage"), &st) ? (time_t) 0 : st.st_mtime;
+}
+
+static time_t rerere_last_used_at(const char *name)
+{
+ struct stat st;
+ return stat(rerere_path(name, "postimage"), &st) ? (time_t) 0 : st.st_mtime;
+}
+
+static void unlink_rr_item(const char *name)
+{
+ unlink(rerere_path(name, "thisimage"));
+ unlink(rerere_path(name, "preimage"));
+ unlink(rerere_path(name, "postimage"));
+ rmdir(git_path("rr-cache/%s", name));
+}
+
+struct rerere_gc_config_cb {
+ int cutoff_noresolve;
+ int cutoff_resolve;
+};
+
+static int git_rerere_gc_config(const char *var, const char *value, void *cb)
+{
+ struct rerere_gc_config_cb *cf = cb;
+
+ if (!strcmp(var, "gc.rerereresolved"))
+ cf->cutoff_resolve = git_config_int(var, value);
+ else if (!strcmp(var, "gc.rerereunresolved"))
+ cf->cutoff_noresolve = git_config_int(var, value);
+ else
+ return git_default_config(var, value, cb);
+ return 0;
+}
+
+void rerere_gc(struct string_list *rr)
+{
+ struct string_list to_remove = STRING_LIST_INIT_DUP;
+ DIR *dir;
+ struct dirent *e;
+ int i, cutoff;
+ time_t now = time(NULL), then;
+ struct rerere_gc_config_cb cf = { 15, 60 };
+
+ git_config(git_rerere_gc_config, &cf);
+ dir = opendir(git_path("rr-cache"));
+ if (!dir)
+ die_errno("unable to open rr-cache directory");
+ while ((e = readdir(dir))) {
+ if (is_dot_or_dotdot(e->d_name))
+ continue;
+
+ then = rerere_last_used_at(e->d_name);
+ if (then) {
+ cutoff = cf.cutoff_resolve;
+ } else {
+ then = rerere_created_at(e->d_name);
+ if (!then)
+ continue;
+ cutoff = cf.cutoff_noresolve;
+ }
+ if (then < now - cutoff * 86400)
+ string_list_append(&to_remove, e->d_name);
+ }
+ closedir(dir);
+ for (i = 0; i < to_remove.nr; i++)
+ unlink_rr_item(to_remove.items[i].string);
+ string_list_clear(&to_remove, 0);
+}
+
+void rerere_clear(struct string_list *merge_rr)
+{
+ int i;
+
+ for (i = 0; i < merge_rr->nr; i++) {
+ const char *name = (const char *)merge_rr->items[i].util;
+ if (!has_rerere_resolution(name))
+ unlink_rr_item(name);
+ }
+ unlink_or_warn(git_path("MERGE_RR"));
+}