#include "builtin.h"
#include "cache.h"
-#include "path-list.h"
+#include "string-list.h"
+#include "rerere.h"
#include "xdiff/xdiff.h"
#include "xdiff-interface.h"
-#include <time.h>
-
static const char git_rerere_usage[] =
-"git-rerere [clear | status | diff | gc]";
+"git rerere [clear | status | diff | gc]";
/* these values are days */
static int cutoff_noresolve = 15;
static int cutoff_resolve = 60;
-/* 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)
{
return git_path("rr-cache/%s/%s", name, file);
}
-static void read_rr(struct path_list *rr)
-{
- unsigned char sha1[20];
- char buf[PATH_MAX];
- FILE *in = fopen(merge_rr_path, "r");
- if (!in)
- return;
- while (fread(buf, 40, 1, in) == 1) {
- int i;
- char *name;
- if (get_sha1_hex(buf, sha1))
- die("corrupt MERGE_RR");
- buf[40] = '\0';
- name = xstrdup(buf);
- if (fgetc(in) != '\t')
- die("corrupt MERGE_RR");
- for (i = 0; i < sizeof(buf) && (buf[i] = fgetc(in)); i++)
- ; /* do nothing */
- if (i == sizeof(buf))
- die("filename too long");
- path_list_insert(buf, rr)->util = xstrdup(name);
- }
- fclose(in);
-}
-
-static struct lock_file write_lock;
-
-static int write_rr(struct path_list *rr, int out_fd)
-{
- int i;
- for (i = 0; i < rr->nr; i++) {
- const char *path = rr->items[i].path;
- int 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_in_full(out_fd, path, length) != length)
- die("unable to write rerere record");
- }
- if (commit_lock_file(&write_lock) != 0)
- die("unable to write rerere record");
- return 0;
-}
-
-static int handle_file(const char *path,
- unsigned char *sha1, const char *output)
-{
- 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 (!f)
- return error("Could not open %s", path);
-
- if (output) {
- out = fopen(output, "w");
- if (!out) {
- fclose(f);
- return error("Could not write %s", output);
- }
- }
-
- if (sha1)
- SHA1_Init(&ctx);
-
- strbuf_init(&one, 0);
- strbuf_init(&two, 0);
- while (fgets(buf, sizeof(buf), f)) {
- if (!prefixcmp(buf, "<<<<<<< "))
- hunk = 1;
- else if (!prefixcmp(buf, "======="))
- hunk = 2;
- else if (!prefixcmp(buf, ">>>>>>> ")) {
- int cmp = strbuf_cmp(&one, &two);
-
- hunk_no++;
- hunk = 0;
- if (cmp > 0) {
- strbuf_swap(&one, &two);
- }
- 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);
- }
- if (sha1) {
- SHA1_Update(&ctx, one.buf ? one.buf : "",
- one.len + 1);
- 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);
- }
- strbuf_release(&one);
- strbuf_release(&two);
-
- fclose(f);
- if (out)
- fclose(out);
- if (sha1)
- SHA1_Final(sha1, &ctx);
- return hunk_no;
-}
-
-static int find_conflict(struct path_list *conflict)
+static time_t rerere_created_at(const char *name)
{
- int i;
- if (read_cache() < 0)
- return error("Could not read index");
- for (i = 0; i+1 < active_nr; i++) {
- struct cache_entry *e2 = active_cache[i];
- struct cache_entry *e3 = active_cache[i+1];
- if (ce_stage(e2) == 2 &&
- ce_stage(e3) == 3 &&
- ce_same_name(e2, e3) &&
- S_ISREG(ntohl(e2->ce_mode)) &&
- S_ISREG(ntohl(e3->ce_mode))) {
- path_list_insert((const char *)e2->name, conflict);
- i++; /* skip over both #2 and #3 */
- }
- }
- return 0;
+ struct stat st;
+ return stat(rr_path(name, "preimage"), &st) ? (time_t) 0 : st.st_mtime;
}
-static int merge(const char *name, const char *path)
+static int has_resolution(const char *name)
{
- int ret;
- mmfile_t cur, base, other;
- mmbuffer_t result = {NULL, 0};
- xpparam_t xpp = {XDF_NEED_MINIMAL};
-
- if (handle_file(path, NULL, rr_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 (!ret) {
- FILE *f = fopen(path, "w");
- if (!f)
- return error("Could not write to %s", path);
- fwrite(result.ptr, result.size, 1, f);
- fclose(f);
- }
-
- free(cur.ptr);
- free(base.ptr);
- free(other.ptr);
- free(result.ptr);
-
- return ret;
+ struct stat st;
+ return !stat(rr_path(name, "postimage"), &st);
}
static void unlink_rr_item(const char *name)
rmdir(git_path("rr-cache/%s", name));
}
-static void garbage_collect(struct path_list *rr)
+static int git_rerere_gc_config(const char *var, const char *value, void *cb)
{
- struct path_list to_remove = { NULL, 0, 0, 1 };
- char buf[1024];
+ if (!strcmp(var, "gc.rerereresolved"))
+ cutoff_resolve = git_config_int(var, value);
+ else if (!strcmp(var, "gc.rerereunresolved"))
+ cutoff_noresolve = git_config_int(var, value);
+ else
+ return git_default_config(var, value, cb);
+ return 0;
+}
+
+static void garbage_collect(struct string_list *rr)
+{
+ struct string_list to_remove = { NULL, 0, 0, 1 };
DIR *dir;
struct dirent *e;
- int len, i, cutoff;
+ int i, cutoff;
time_t now = time(NULL), then;
- strlcpy(buf, git_path("rr-cache"), sizeof(buf));
- len = strlen(buf);
- dir = opendir(buf);
- strcpy(buf + len++, "/");
+ git_config(git_rerere_gc_config, NULL);
+ dir = opendir(git_path("rr-cache"));
while ((e = readdir(dir))) {
const char *name = e->d_name;
- struct stat st;
- if (name[0] == '.' && (name[1] == '\0' ||
- (name[1] == '.' && name[2] == '\0')))
+ if (name[0] == '.' &&
+ (name[1] == '\0' || (name[1] == '.' && name[2] == '\0')))
continue;
- i = snprintf(buf + len, sizeof(buf) - len, "%s", name);
- strlcpy(buf + len + i, "/preimage", sizeof(buf) - len - i);
- if (stat(buf, &st))
+ then = rerere_created_at(name);
+ if (!then)
continue;
- then = st.st_mtime;
- strlcpy(buf + len + i, "/postimage", sizeof(buf) - len - i);
- cutoff = stat(buf, &st) ? cutoff_noresolve : cutoff_resolve;
- if (then < now - cutoff * 86400) {
- buf[len + i] = '\0';
- path_list_insert(xstrdup(name), &to_remove);
- }
+ cutoff = (has_resolution(name)
+ ? cutoff_resolve : cutoff_noresolve);
+ if (then < now - cutoff * 86400)
+ string_list_append(name, &to_remove);
}
for (i = 0; i < to_remove.nr; i++)
- unlink_rr_item(to_remove.items[i].path);
- path_list_clear(&to_remove, 0);
+ unlink_rr_item(to_remove.items[i].string);
+ string_list_clear(&to_remove, 0);
}
static int outf(void *dummy, mmbuffer_t *ptr, int nbuf)
return 0;
}
-static int copy_file(const char *src, const char *dest)
-{
- FILE *in, *out;
- char buffer[32768];
- int count;
-
- if (!(in = fopen(src, "r")))
- return error("Could not open %s", src);
- if (!(out = fopen(dest, "w")))
- return error("Could not open %s", dest);
- while ((count = fread(buffer, 1, sizeof(buffer), in)))
- fwrite(buffer, 1, count, out);
- fclose(in);
- fclose(out);
- return 0;
-}
-
-static int do_plain_rerere(struct path_list *rr, int fd)
-{
- struct path_list conflict = { NULL, 0, 0, 1 };
- int i;
-
- find_conflict(&conflict);
-
- /*
- * MERGE_RR records paths with conflicts immediately after merge
- * failed. Some of the conflicted paths might have been hand resolved
- * in the working tree since then, but the initial run would catch all
- * and register their preimages.
- */
-
- for (i = 0; i < conflict.nr; i++) {
- const char *path = conflict.items[i].path;
- if (!path_list_has_path(rr, path)) {
- unsigned char sha1[20];
- char *hex;
- int ret;
- ret = handle_file(path, sha1, NULL);
- if (ret < 1)
- continue;
- hex = xstrdup(sha1_to_hex(sha1));
- path_list_insert(path, rr)->util = hex;
- if (mkdir(git_path("rr-cache/%s", hex), 0755))
- continue;;
- handle_file(path, NULL, rr_path(hex, "preimage"));
- fprintf(stderr, "Recorded preimage for '%s'\n", path);
- }
- }
-
- /*
- * Now some of the paths that had conflicts earlier might have been
- * hand resolved. Others may be similar to a conflict already that
- * was resolved before.
- */
-
- for (i = 0; i < rr->nr; i++) {
- struct stat st;
- int ret;
- const char *path = rr->items[i].path;
- const char *name = (const char *)rr->items[i].util;
-
- if (!stat(rr_path(name, "preimage"), &st) &&
- !stat(rr_path(name, "postimage"), &st)) {
- if (!merge(name, path)) {
- fprintf(stderr, "Resolved '%s' using "
- "previous resolution.\n", path);
- goto tail_optimization;
- }
- }
-
- /* Let's see if we have resolved it. */
- ret = handle_file(path, NULL, NULL);
- if (ret)
- continue;
-
- fprintf(stderr, "Recorded resolution for '%s'.\n", path);
- copy_file(path, rr_path(name, "postimage"));
-tail_optimization:
- if (i < rr->nr - 1)
- memmove(rr->items + i,
- rr->items + i + 1,
- sizeof(rr->items[0]) * (rr->nr - i - 1));
- rr->nr--;
- i--;
- }
-
- return write_rr(rr, fd);
-}
-
-static int git_rerere_config(const char *var, const char *value)
-{
- if (!strcmp(var, "gc.rerereresolved"))
- cutoff_resolve = git_config_int(var, value);
- else if (!strcmp(var, "gc.rerereunresolved"))
- cutoff_noresolve = git_config_int(var, value);
- else if (!strcmp(var, "rerere.enabled"))
- rerere_enabled = git_config_bool(var, value);
- else
- return git_default_config(var, value);
- return 0;
-}
-
-static int is_rerere_enabled(void)
-{
- struct stat st;
- const char *rr_cache;
- int rr_cache_exists;
-
- if (!rerere_enabled)
- return 0;
-
- rr_cache = git_path("rr-cache");
- rr_cache_exists = !stat(rr_cache, &st) && S_ISDIR(st.st_mode);
- if (rerere_enabled < 0)
- return rr_cache_exists;
-
- if (!rr_cache_exists &&
- (mkdir(rr_cache, 0777) || adjust_shared_perm(rr_cache)))
- die("Could not create directory %s", rr_cache);
- return 1;
-}
-
-static int setup_rerere(struct path_list *merge_rr)
-{
- int fd;
-
- git_config(git_rerere_config);
- if (!is_rerere_enabled())
- return -1;
-
- merge_rr_path = xstrdup(git_path("rr-cache/MERGE_RR"));
- fd = hold_lock_file_for_update(&write_lock, merge_rr_path, 1);
- read_rr(merge_rr);
- return fd;
-}
-
-int rerere(void)
-{
- struct path_list merge_rr = { NULL, 0, 0, 1 };
- int fd;
-
- fd = setup_rerere(&merge_rr);
- if (fd < 0)
- return 0;
- return do_plain_rerere(&merge_rr, fd);
-}
-
int cmd_rerere(int argc, const char **argv, const char *prefix)
{
- struct path_list merge_rr = { NULL, 0, 0, 1 };
+ struct string_list merge_rr = { NULL, 0, 0, 1 };
int i, fd;
+ if (argc < 2)
+ return rerere();
+
fd = setup_rerere(&merge_rr);
if (fd < 0)
return 0;
- if (argc < 2)
- return do_plain_rerere(&merge_rr, fd);
- else if (!strcmp(argv[1], "clear")) {
+ if (!strcmp(argv[1], "clear")) {
for (i = 0; i < merge_rr.nr; i++) {
- struct stat st;
const char *name = (const char *)merge_rr.items[i].util;
- if (!stat(git_path("rr-cache/%s", name), &st) &&
- S_ISDIR(st.st_mode) &&
- stat(rr_path(name, "postimage"), &st))
+ if (!has_resolution(name))
unlink_rr_item(name);
}
- unlink(merge_rr_path);
+ unlink(git_path("rr-cache/MERGE_RR"));
} else if (!strcmp(argv[1], "gc"))
garbage_collect(&merge_rr);
else if (!strcmp(argv[1], "status"))
for (i = 0; i < merge_rr.nr; i++)
- printf("%s\n", merge_rr.items[i].path);
+ printf("%s\n", merge_rr.items[i].string);
else if (!strcmp(argv[1], "diff"))
for (i = 0; i < merge_rr.nr; i++) {
- const char *path = merge_rr.items[i].path;
+ const char *path = merge_rr.items[i].string;
const char *name = (const char *)merge_rr.items[i].util;
diff_two(rr_path(name, "preimage"), path, path, path);
}
else
usage(git_rerere_usage);
- path_list_clear(&merge_rr, 1);
+ string_list_clear(&merge_rr, 1);
return 0;
}