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git/builtin-rerere.c
Stephan Beyer 1b1dd23f2d Make usage strings dash-less 
When you misuse a git command, you are shown the usage string.
But this is currently shown in the dashed form.  So if you just
copy what you see, it will not work, when the dashed form
is no longer supported.

This patch makes git commands show the dash-less version.

For shell scripts that do not specify OPTIONS_SPEC, git-sh-setup.sh
generates a dash-less usage string now.

Signed-off-by: Stephan Beyer <s-beyer@gmx.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-07-13 14:12:48 -07:00

474 lines
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#include "builtin.h"
#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;
/* if rerere_enabled == -1, fall back to detection of .git/rr-cache */
static int rerere_enabled = -1;
/* automatically update cleanly resolved paths to the index */
static int rerere_autoupdate;
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 time_t rerere_created_at(const char *name)
{
struct stat st;
return stat(rr_path(name, "preimage"), &st) ? (time_t) 0 : st.st_mtime;
}
static int has_resolution(const char *name)
{
struct stat st;
return !stat(rr_path(name, "postimage"), &st);
}
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 = 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;
int length;
if (!rr->items[i].util)
continue;
path = rr->items[i].path;
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, ">>>>>>> ")) {
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);
}
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);
if (hunk) {
if (output)
unlink(output);
return error("Could not parse conflict hunks in %s", path);
}
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+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(e2->ce_mode) &&
S_ISREG(e3->ce_mode)) {
path_list_insert((const char *)e2->name, conflict);
i++; /* skip over both #2 and #3 */
}
}
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 };
DIR *dir;
struct dirent *e;
int i, cutoff;
time_t now = time(NULL), then;
dir = opendir(git_path("rr-cache"));
while ((e = readdir(dir))) {
const char *name = e->d_name;
if (name[0] == '.' &&
(name[1] == '\0' || (name[1] == '.' && name[2] == '\0')))
continue;
then = rerere_created_at(name);
if (!then)
continue;
cutoff = (has_resolution(name)
? cutoff_resolve : cutoff_noresolve);
if (then < now - cutoff * 86400)
path_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);
}
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;
memset(&xecfg, 0, sizeof(xecfg));
xecfg.ctxlen = 3;
ecb.outf = outf;
xdi_diff(&minus, &plus, &xpp, &xecfg, &ecb);
free(minus.ptr);
free(plus.ptr);
return 0;
}
static struct lock_file index_lock;
static int update_paths(struct path_list *update)
{
int i;
int fd = hold_locked_index(&index_lock, 0);
int status = 0;
if (fd < 0)
return -1;
for (i = 0; i < update->nr; i++) {
struct path_list_item *item = &update->items[i];
if (add_file_to_cache(item->path, ADD_CACHE_IGNORE_ERRORS))
status = -1;
}
if (!status && active_cache_changed) {
if (write_cache(fd, active_cache, active_nr) ||
commit_locked_index(&index_lock))
die("Unable to write new index file");
} else if (fd >= 0)
rollback_lock_file(&index_lock);
return status;
}
static int do_plain_rerere(struct path_list *rr, int fd)
{
struct path_list conflict = { NULL, 0, 0, 1 };
struct path_list update = { 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++) {
int ret;
const char *path = rr->items[i].path;
const char *name = (const char *)rr->items[i].util;
if (has_resolution(name)) {
if (!merge(name, path)) {
fprintf(stderr, "Resolved '%s' using "
"previous resolution.\n", path);
if (rerere_autoupdate)
path_list_insert(path, &update);
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(rr_path(name, "postimage"), path, 0666);
mark_resolved:
rr->items[i].util = NULL;
}
if (update.nr)
update_paths(&update);
return write_rr(rr, fd);
}
static int git_rerere_config(const char *var, const char *value, void *cb)
{
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 if (!strcmp(var, "rerere.autoupdate"))
rerere_autoupdate = git_config_bool(var, value);
else
return git_default_config(var, value, cb);
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, NULL);
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 };
int i, fd;
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")) {
for (i = 0; i < merge_rr.nr; i++) {
const char *name = (const char *)merge_rr.items[i].util;
if (!has_resolution(name))
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;
}
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