mirror of
https://github.com/git/git
synced 2024-08-25 02:35:46 +00:00
![Tanay Abhra](/assets/img/avatar_default.png)
Use `git_config_get_*()` family instead of `git_config()` to take advantage of the config-set API which provides a cleaner control flow. Signed-off-by: Tanay Abhra <tanayabh@gmail.com> Reviewed-by: Matthieu Moy <Matthieu.Moy@imag.fr> Signed-off-by: Junio C Hamano <gitster@pobox.com>
747 lines
18 KiB
C
747 lines
18 KiB
C
#include "cache.h"
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#include "string-list.h"
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#include "rerere.h"
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#include "xdiff-interface.h"
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#include "dir.h"
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#include "resolve-undo.h"
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#include "ll-merge.h"
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#include "attr.h"
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#include "pathspec.h"
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#define RESOLVED 0
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#define PUNTED 1
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#define THREE_STAGED 2
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void *RERERE_RESOLVED = &RERERE_RESOLVED;
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/* if rerere_enabled == -1, fall back to detection of .git/rr-cache */
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static int rerere_enabled = -1;
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/* automatically update cleanly resolved paths to the index */
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static int rerere_autoupdate;
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static char *merge_rr_path;
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const char *rerere_path(const char *hex, const char *file)
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{
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return git_path("rr-cache/%s/%s", hex, file);
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}
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static int has_rerere_resolution(const char *hex)
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{
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struct stat st;
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return !stat(rerere_path(hex, "postimage"), &st);
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}
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static void read_rr(struct string_list *rr)
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{
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unsigned char sha1[20];
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char buf[PATH_MAX];
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FILE *in = fopen(merge_rr_path, "r");
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if (!in)
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return;
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while (fread(buf, 40, 1, in) == 1) {
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int i;
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char *name;
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if (get_sha1_hex(buf, sha1))
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die("corrupt MERGE_RR");
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buf[40] = '\0';
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name = xstrdup(buf);
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if (fgetc(in) != '\t')
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die("corrupt MERGE_RR");
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for (i = 0; i < sizeof(buf); i++) {
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int c = fgetc(in);
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if (c < 0)
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die("corrupt MERGE_RR");
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buf[i] = c;
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if (c == 0)
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break;
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}
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if (i == sizeof(buf))
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die("filename too long");
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string_list_insert(rr, buf)->util = name;
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}
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fclose(in);
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}
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static struct lock_file write_lock;
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static int write_rr(struct string_list *rr, int out_fd)
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{
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int i;
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for (i = 0; i < rr->nr; i++) {
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const char *path;
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int length;
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if (!rr->items[i].util)
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continue;
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path = rr->items[i].string;
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length = strlen(path) + 1;
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if (write_in_full(out_fd, rr->items[i].util, 40) != 40 ||
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write_str_in_full(out_fd, "\t") != 1 ||
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write_in_full(out_fd, path, length) != length)
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die("unable to write rerere record");
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}
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if (commit_lock_file(&write_lock) != 0)
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die("unable to write rerere record");
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return 0;
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}
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static void ferr_write(const void *p, size_t count, FILE *fp, int *err)
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{
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if (!count || *err)
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return;
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if (fwrite(p, count, 1, fp) != 1)
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*err = errno;
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}
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static inline void ferr_puts(const char *s, FILE *fp, int *err)
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{
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ferr_write(s, strlen(s), fp, err);
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}
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struct rerere_io {
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int (*getline)(struct strbuf *, struct rerere_io *);
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FILE *output;
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int wrerror;
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/* some more stuff */
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};
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static void rerere_io_putstr(const char *str, struct rerere_io *io)
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{
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if (io->output)
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ferr_puts(str, io->output, &io->wrerror);
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}
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static void rerere_io_putconflict(int ch, int size, struct rerere_io *io)
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{
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char buf[64];
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while (size) {
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if (size < sizeof(buf) - 2) {
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memset(buf, ch, size);
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buf[size] = '\n';
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buf[size + 1] = '\0';
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size = 0;
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} else {
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int sz = sizeof(buf) - 1;
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if (size <= sz)
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sz -= (sz - size) + 1;
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memset(buf, ch, sz);
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buf[sz] = '\0';
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size -= sz;
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}
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rerere_io_putstr(buf, io);
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}
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}
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static void rerere_io_putmem(const char *mem, size_t sz, struct rerere_io *io)
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{
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if (io->output)
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ferr_write(mem, sz, io->output, &io->wrerror);
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}
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struct rerere_io_file {
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struct rerere_io io;
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FILE *input;
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};
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static int rerere_file_getline(struct strbuf *sb, struct rerere_io *io_)
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{
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struct rerere_io_file *io = (struct rerere_io_file *)io_;
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return strbuf_getwholeline(sb, io->input, '\n');
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}
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static int is_cmarker(char *buf, int marker_char, int marker_size, int want_sp)
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{
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while (marker_size--)
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if (*buf++ != marker_char)
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return 0;
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if (want_sp && *buf != ' ')
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return 0;
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return isspace(*buf);
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}
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static int handle_path(unsigned char *sha1, struct rerere_io *io, int marker_size)
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{
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git_SHA_CTX ctx;
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int hunk_no = 0;
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enum {
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RR_CONTEXT = 0, RR_SIDE_1, RR_SIDE_2, RR_ORIGINAL
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} hunk = RR_CONTEXT;
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struct strbuf one = STRBUF_INIT, two = STRBUF_INIT;
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struct strbuf buf = STRBUF_INIT;
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if (sha1)
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git_SHA1_Init(&ctx);
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while (!io->getline(&buf, io)) {
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if (is_cmarker(buf.buf, '<', marker_size, 1)) {
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if (hunk != RR_CONTEXT)
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goto bad;
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hunk = RR_SIDE_1;
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} else if (is_cmarker(buf.buf, '|', marker_size, 0)) {
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if (hunk != RR_SIDE_1)
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goto bad;
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hunk = RR_ORIGINAL;
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} else if (is_cmarker(buf.buf, '=', marker_size, 0)) {
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if (hunk != RR_SIDE_1 && hunk != RR_ORIGINAL)
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goto bad;
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hunk = RR_SIDE_2;
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} else if (is_cmarker(buf.buf, '>', marker_size, 1)) {
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if (hunk != RR_SIDE_2)
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goto bad;
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if (strbuf_cmp(&one, &two) > 0)
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strbuf_swap(&one, &two);
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hunk_no++;
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hunk = RR_CONTEXT;
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rerere_io_putconflict('<', marker_size, io);
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rerere_io_putmem(one.buf, one.len, io);
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rerere_io_putconflict('=', marker_size, io);
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rerere_io_putmem(two.buf, two.len, io);
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rerere_io_putconflict('>', marker_size, io);
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if (sha1) {
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git_SHA1_Update(&ctx, one.buf ? one.buf : "",
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one.len + 1);
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git_SHA1_Update(&ctx, two.buf ? two.buf : "",
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two.len + 1);
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}
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strbuf_reset(&one);
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strbuf_reset(&two);
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} else if (hunk == RR_SIDE_1)
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strbuf_addbuf(&one, &buf);
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else if (hunk == RR_ORIGINAL)
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; /* discard */
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else if (hunk == RR_SIDE_2)
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strbuf_addbuf(&two, &buf);
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else
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rerere_io_putstr(buf.buf, io);
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continue;
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bad:
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hunk = 99; /* force error exit */
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break;
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}
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strbuf_release(&one);
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strbuf_release(&two);
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strbuf_release(&buf);
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if (sha1)
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git_SHA1_Final(sha1, &ctx);
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if (hunk != RR_CONTEXT)
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return -1;
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return hunk_no;
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}
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static int handle_file(const char *path, unsigned char *sha1, const char *output)
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{
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int hunk_no = 0;
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struct rerere_io_file io;
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int marker_size = ll_merge_marker_size(path);
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memset(&io, 0, sizeof(io));
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io.io.getline = rerere_file_getline;
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io.input = fopen(path, "r");
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io.io.wrerror = 0;
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if (!io.input)
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return error("Could not open %s", path);
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if (output) {
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io.io.output = fopen(output, "w");
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if (!io.io.output) {
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fclose(io.input);
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return error("Could not write %s", output);
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}
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}
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hunk_no = handle_path(sha1, (struct rerere_io *)&io, marker_size);
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fclose(io.input);
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if (io.io.wrerror)
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error("There were errors while writing %s (%s)",
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path, strerror(io.io.wrerror));
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if (io.io.output && fclose(io.io.output))
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io.io.wrerror = error("Failed to flush %s: %s",
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path, strerror(errno));
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if (hunk_no < 0) {
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if (output)
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unlink_or_warn(output);
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return error("Could not parse conflict hunks in %s", path);
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}
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if (io.io.wrerror)
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return -1;
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return hunk_no;
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}
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struct rerere_io_mem {
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struct rerere_io io;
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struct strbuf input;
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};
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static int rerere_mem_getline(struct strbuf *sb, struct rerere_io *io_)
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{
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struct rerere_io_mem *io = (struct rerere_io_mem *)io_;
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char *ep;
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size_t len;
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strbuf_release(sb);
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if (!io->input.len)
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return -1;
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ep = memchr(io->input.buf, '\n', io->input.len);
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if (!ep)
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ep = io->input.buf + io->input.len;
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else if (*ep == '\n')
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ep++;
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len = ep - io->input.buf;
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strbuf_add(sb, io->input.buf, len);
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strbuf_remove(&io->input, 0, len);
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return 0;
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}
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static int handle_cache(const char *path, unsigned char *sha1, const char *output)
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{
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mmfile_t mmfile[3] = {{NULL}};
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mmbuffer_t result = {NULL, 0};
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const struct cache_entry *ce;
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int pos, len, i, hunk_no;
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struct rerere_io_mem io;
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int marker_size = ll_merge_marker_size(path);
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/*
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* Reproduce the conflicted merge in-core
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*/
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len = strlen(path);
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pos = cache_name_pos(path, len);
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if (0 <= pos)
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return -1;
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pos = -pos - 1;
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for (i = 0; i < 3; i++) {
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enum object_type type;
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unsigned long size;
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int j;
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if (active_nr <= pos)
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break;
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ce = active_cache[pos++];
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if (ce_namelen(ce) != len || memcmp(ce->name, path, len))
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continue;
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j = ce_stage(ce) - 1;
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mmfile[j].ptr = read_sha1_file(ce->sha1, &type, &size);
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mmfile[j].size = size;
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}
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for (i = 0; i < 3; i++) {
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if (!mmfile[i].ptr && !mmfile[i].size)
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mmfile[i].ptr = xstrdup("");
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}
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/*
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* NEEDSWORK: handle conflicts from merges with
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* merge.renormalize set, too
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*/
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ll_merge(&result, path, &mmfile[0], NULL,
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&mmfile[1], "ours",
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&mmfile[2], "theirs", NULL);
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for (i = 0; i < 3; i++)
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free(mmfile[i].ptr);
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memset(&io, 0, sizeof(io));
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io.io.getline = rerere_mem_getline;
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if (output)
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io.io.output = fopen(output, "w");
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else
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io.io.output = NULL;
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strbuf_init(&io.input, 0);
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strbuf_attach(&io.input, result.ptr, result.size, result.size);
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hunk_no = handle_path(sha1, (struct rerere_io *)&io, marker_size);
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strbuf_release(&io.input);
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if (io.io.output)
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fclose(io.io.output);
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return hunk_no;
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}
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static int check_one_conflict(int i, int *type)
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{
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const struct cache_entry *e = active_cache[i];
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if (!ce_stage(e)) {
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*type = RESOLVED;
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return i + 1;
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}
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*type = PUNTED;
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if (ce_stage(e) == 1) {
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if (active_nr <= ++i)
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return i + 1;
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}
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/* Only handle regular files with both stages #2 and #3 */
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if (i + 1 < active_nr) {
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const struct cache_entry *e2 = active_cache[i];
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const struct cache_entry *e3 = active_cache[i + 1];
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if (ce_stage(e2) == 2 &&
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ce_stage(e3) == 3 &&
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ce_same_name(e, e3) &&
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S_ISREG(e2->ce_mode) &&
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S_ISREG(e3->ce_mode))
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*type = THREE_STAGED;
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}
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/* Skip the entries with the same name */
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while (i < active_nr && ce_same_name(e, active_cache[i]))
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i++;
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return i;
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}
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static int find_conflict(struct string_list *conflict)
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{
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int i;
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if (read_cache() < 0)
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return error("Could not read index");
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for (i = 0; i < active_nr;) {
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int conflict_type;
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const struct cache_entry *e = active_cache[i];
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i = check_one_conflict(i, &conflict_type);
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if (conflict_type == THREE_STAGED)
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string_list_insert(conflict, (const char *)e->name);
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}
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return 0;
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}
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int rerere_remaining(struct string_list *merge_rr)
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{
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int i;
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if (read_cache() < 0)
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return error("Could not read index");
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for (i = 0; i < active_nr;) {
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int conflict_type;
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const struct cache_entry *e = active_cache[i];
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i = check_one_conflict(i, &conflict_type);
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if (conflict_type == PUNTED)
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string_list_insert(merge_rr, (const char *)e->name);
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else if (conflict_type == RESOLVED) {
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struct string_list_item *it;
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it = string_list_lookup(merge_rr, (const char *)e->name);
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if (it != NULL) {
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free(it->util);
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it->util = RERERE_RESOLVED;
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}
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}
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}
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return 0;
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}
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|
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static int merge(const char *name, const char *path)
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{
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int ret;
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mmfile_t cur = {NULL, 0}, base = {NULL, 0}, other = {NULL, 0};
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mmbuffer_t result = {NULL, 0};
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if (handle_file(path, NULL, rerere_path(name, "thisimage")) < 0)
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return 1;
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|
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if (read_mmfile(&cur, rerere_path(name, "thisimage")) ||
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read_mmfile(&base, rerere_path(name, "preimage")) ||
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read_mmfile(&other, rerere_path(name, "postimage"))) {
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ret = 1;
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goto out;
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}
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ret = ll_merge(&result, path, &base, NULL, &cur, "", &other, "", NULL);
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if (!ret) {
|
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FILE *f;
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|
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if (utime(rerere_path(name, "postimage"), NULL) < 0)
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warning("failed utime() on %s: %s",
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rerere_path(name, "postimage"),
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strerror(errno));
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f = fopen(path, "w");
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if (!f)
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return error("Could not open %s: %s", path,
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strerror(errno));
|
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if (fwrite(result.ptr, result.size, 1, f) != 1)
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error("Could not write %s: %s", path, strerror(errno));
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if (fclose(f))
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return error("Writing %s failed: %s", path,
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strerror(errno));
|
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}
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out:
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free(cur.ptr);
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free(base.ptr);
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free(other.ptr);
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free(result.ptr);
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|
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return ret;
|
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}
|
|
|
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static struct lock_file index_lock;
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|
|
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static int update_paths(struct string_list *update)
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|
{
|
|
int i;
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int fd = hold_locked_index(&index_lock, 0);
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int status = 0;
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|
|
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if (fd < 0)
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return -1;
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|
|
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for (i = 0; i < update->nr; i++) {
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struct string_list_item *item = &update->items[i];
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if (add_file_to_cache(item->string, ADD_CACHE_IGNORE_ERRORS))
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status = -1;
|
|
}
|
|
|
|
if (!status && active_cache_changed) {
|
|
if (write_locked_index(&the_index, &index_lock, COMMIT_LOCK))
|
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die("Unable to write new index file");
|
|
} else if (fd >= 0)
|
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rollback_lock_file(&index_lock);
|
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return status;
|
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}
|
|
|
|
static int do_plain_rerere(struct string_list *rr, int fd)
|
|
{
|
|
struct string_list conflict = STRING_LIST_INIT_DUP;
|
|
struct string_list update = STRING_LIST_INIT_DUP;
|
|
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].string;
|
|
if (!string_list_has_string(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));
|
|
string_list_insert(rr, path)->util = hex;
|
|
if (mkdir_in_gitdir(git_path("rr-cache/%s", hex)))
|
|
continue;
|
|
handle_file(path, NULL, rerere_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++) {
|
|
int ret;
|
|
const char *path = rr->items[i].string;
|
|
const char *name = (const char *)rr->items[i].util;
|
|
|
|
if (has_rerere_resolution(name)) {
|
|
if (!merge(name, path)) {
|
|
const char *msg;
|
|
if (rerere_autoupdate) {
|
|
string_list_insert(&update, path);
|
|
msg = "Staged '%s' using previous resolution.\n";
|
|
} else
|
|
msg = "Resolved '%s' using previous resolution.\n";
|
|
fprintf(stderr, msg, path);
|
|
goto mark_resolved;
|
|
}
|
|
}
|
|
|
|
/* 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(rerere_path(name, "postimage"), path, 0666);
|
|
mark_resolved:
|
|
rr->items[i].util = NULL;
|
|
}
|
|
|
|
if (update.nr)
|
|
update_paths(&update);
|
|
|
|
return write_rr(rr, fd);
|
|
}
|
|
|
|
static void git_rerere_config(void)
|
|
{
|
|
git_config_get_bool("rerere.enabled", &rerere_enabled);
|
|
git_config_get_bool("rerere.autoupdate", &rerere_autoupdate);
|
|
git_config(git_default_config, NULL);
|
|
}
|
|
|
|
static int is_rerere_enabled(void)
|
|
{
|
|
const char *rr_cache;
|
|
int rr_cache_exists;
|
|
|
|
if (!rerere_enabled)
|
|
return 0;
|
|
|
|
rr_cache = git_path("rr-cache");
|
|
rr_cache_exists = is_directory(rr_cache);
|
|
if (rerere_enabled < 0)
|
|
return rr_cache_exists;
|
|
|
|
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 flags)
|
|
{
|
|
int fd;
|
|
|
|
git_rerere_config();
|
|
if (!is_rerere_enabled())
|
|
return -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(int flags)
|
|
{
|
|
struct string_list merge_rr = STRING_LIST_INIT_DUP;
|
|
int fd;
|
|
|
|
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(struct pathspec *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, 0))
|
|
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));
|
|
}
|
|
|
|
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;
|
|
int cutoff_noresolve = 15;
|
|
int cutoff_resolve = 60;
|
|
|
|
git_config_get_int("gc.rerereresolved", &cutoff_resolve);
|
|
git_config_get_int("gc.rerereunresolved", &cutoff_noresolve);
|
|
git_config(git_default_config, NULL);
|
|
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 = cutoff_resolve;
|
|
} else {
|
|
then = rerere_created_at(e->d_name);
|
|
if (!then)
|
|
continue;
|
|
cutoff = 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"));
|
|
}
|