summaryrefslogtreecommitdiff
path: root/builtin-rerere.c
diff options
context:
space:
mode:
Diffstat (limited to 'builtin-rerere.c')
-rw-r--r--builtin-rerere.c425
1 files changed, 0 insertions, 425 deletions
diff --git a/builtin-rerere.c b/builtin-rerere.c
deleted file mode 100644
index b8867ab4ad..0000000000
--- a/builtin-rerere.c
+++ /dev/null
@@ -1,425 +0,0 @@
-#include "cache.h"
-#include "path-list.h"
-#include "xdiff/xdiff.h"
-#include "xdiff-interface.h"
-
-#include <time.h>
-
-static const char git_rerere_usage[] =
-"git-rerere [clear | status | diff | gc]";
-
-/* these values are days */
-static int cutoff_noresolve = 15;
-static int cutoff_resolve = 60;
-
-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");
- }
- close(out_fd);
- return commit_lock_file(&write_lock);
-}
-
-struct buffer {
- char *ptr;
- int nr, alloc;
-};
-
-static void append_line(struct buffer *buffer, const char *line)
-{
- int len = strlen(line);
-
- if (buffer->nr + len > buffer->alloc) {
- buffer->alloc = alloc_nr(buffer->nr + len);
- buffer->ptr = xrealloc(buffer->ptr, buffer->alloc);
- }
- memcpy(buffer->ptr + buffer->nr, line, len);
- buffer->nr += len;
-}
-
-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 buffer minus = { NULL, 0, 0 }, plus = { NULL, 0, 0 };
- struct buffer *one = &minus, *two = &plus;
- FILE *f = fopen(path, "r");
- FILE *out;
-
- 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);
- }
- } else
- out = NULL;
-
- if (sha1)
- SHA1_Init(&ctx);
-
- while (fgets(buf, sizeof(buf), f)) {
- if (!prefixcmp(buf, "<<<<<<< "))
- hunk = 1;
- else if (!prefixcmp(buf, "======="))
- hunk = 2;
- else if (!prefixcmp(buf, ">>>>>>> ")) {
- hunk_no++;
- hunk = 0;
- if (memcmp(one->ptr, two->ptr, one->nr < two->nr ?
- one->nr : two->nr) > 0) {
- struct buffer *swap = one;
- one = two;
- two = swap;
- }
- if (out) {
- fputs("<<<<<<<\n", out);
- fwrite(one->ptr, one->nr, 1, out);
- fputs("=======\n", out);
- fwrite(two->ptr, two->nr, 1, out);
- fputs(">>>>>>>\n", out);
- }
- if (sha1) {
- SHA1_Update(&ctx, one->ptr, one->nr);
- SHA1_Update(&ctx, "\0", 1);
- SHA1_Update(&ctx, two->ptr, two->nr);
- SHA1_Update(&ctx, "\0", 1);
- }
- } else if (hunk == 1)
- append_line(one, buf);
- else if (hunk == 2)
- append_line(two, buf);
- else if (out)
- fputs(buf, out);
- }
-
- fclose(f);
- if (out)
- fclose(out);
- if (sha1)
- SHA1_Final(sha1, &ctx);
- return hunk_no;
-}
-
-static int find_conflict(struct path_list *conflict)
-{
- int i;
- if (read_cache() < 0)
- return error("Could not read index");
- for (i = 0; i + 2 < active_nr; i++) {
- struct cache_entry *e1 = active_cache[i];
- struct cache_entry *e2 = active_cache[i+1];
- struct cache_entry *e3 = active_cache[i+2];
- if (ce_stage(e1) == 1 &&
- ce_stage(e2) == 2 &&
- ce_stage(e3) == 3 &&
- ce_same_name(e1, e2) && ce_same_name(e1, e3) &&
- S_ISREG(ntohl(e1->ce_mode)) &&
- S_ISREG(ntohl(e2->ce_mode)) &&
- S_ISREG(ntohl(e3->ce_mode))) {
- path_list_insert((const char *)e1->name, conflict);
- i += 2;
- }
- }
- return 0;
-}
-
-static int merge(const char *name, const char *path)
-{
- 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;
-}
-
-static void unlink_rr_item(const char *name)
-{
- unlink(rr_path(name, "thisimage"));
- unlink(rr_path(name, "preimage"));
- unlink(rr_path(name, "postimage"));
- rmdir(git_path("rr-cache/%s", name));
-}
-
-static void garbage_collect(struct path_list *rr)
-{
- struct path_list to_remove = { NULL, 0, 0, 1 };
- char buf[1024];
- DIR *dir;
- struct dirent *e;
- int len, 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++, "/");
- while ((e = readdir(dir))) {
- const char *name = e->d_name;
- struct stat st;
- 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))
- 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);
- }
- }
- for (i = 0; i < to_remove.nr; i++)
- unlink_rr_item(to_remove.items[i].path);
- path_list_clear(&to_remove, 0);
-}
-
-static int outf(void *dummy, mmbuffer_t *ptr, int nbuf)
-{
- int i;
- for (i = 0; i < nbuf; i++)
- if (write_in_full(1, ptr[i].ptr, ptr[i].size) != ptr[i].size)
- return -1;
- return 0;
-}
-
-static int diff_two(const char *file1, const char *label1,
- const char *file2, const char *label2)
-{
- xpparam_t xpp;
- xdemitconf_t xecfg;
- xdemitcb_t ecb;
- mmfile_t minus, plus;
-
- if (read_mmfile(&minus, file1) || read_mmfile(&plus, file2))
- return 1;
-
- printf("--- a/%s\n+++ b/%s\n", label1, label2);
- fflush(stdout);
- xpp.flags = XDF_NEED_MINIMAL;
- xecfg.ctxlen = 3;
- xecfg.flags = 0;
- ecb.outf = outf;
- xdl_diff(&minus, &plus, &xpp, &xecfg, &ecb);
-
- free(minus.ptr);
- free(plus.ptr);
- 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
- return git_default_config(var, value);
- return 0;
-}
-
-int cmd_rerere(int argc, const char **argv, const char *prefix)
-{
- struct path_list merge_rr = { NULL, 0, 0, 1 };
- int i, fd = -1;
- struct stat st;
-
- if (stat(git_path("rr-cache"), &st) || !S_ISDIR(st.st_mode))
- return 0;
-
- git_config(git_rerere_config);
-
- 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);
-
- if (argc < 2)
- return do_plain_rerere(&merge_rr, fd);
- else if (!strcmp(argv[1], "clear")) {
- for (i = 0; i < merge_rr.nr; i++) {
- 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))
- unlink_rr_item(name);
- }
- unlink(merge_rr_path);
- } 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);
- else if (!strcmp(argv[1], "diff"))
- for (i = 0; i < merge_rr.nr; i++) {
- const char *path = merge_rr.items[i].path;
- 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);
- return 0;
-}
-
generated by cgit v1.2.3 (git 2.25.1) at 2024-10-22 19:21:43 +0000