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#include "cache.h"
#include "lockfile.h"
#include "commit.h"
#include "tag.h"
#include "pkt-line.h"
#include "remote.h"
#include "refs.h"
#include "sha1-array.h"
#include "diff.h"
#include "revision.h"
#include "commit-slab.h"
#include "sigchain.h"
static int is_shallow = -1;
static struct stat_validity shallow_stat;
static char *alternate_shallow_file;
void set_alternate_shallow_file(const char *path, int override)
{
if (is_shallow != -1)
die("BUG: is_repository_shallow must not be called before set_alternate_shallow_file");
if (alternate_shallow_file && !override)
return;
free(alternate_shallow_file);
alternate_shallow_file = xstrdup_or_null(path);
}
int register_shallow(const unsigned char *sha1)
{
struct commit_graft *graft =
xmalloc(sizeof(struct commit_graft));
struct commit *commit = lookup_commit(sha1);
hashcpy(graft->sha1, sha1);
graft->nr_parent = -1;
if (commit && commit->object.parsed)
commit->parents = NULL;
return register_commit_graft(graft, 0);
}
int is_repository_shallow(void)
{
FILE *fp;
char buf[1024];
const char *path = alternate_shallow_file;
if (is_shallow >= 0)
return is_shallow;
if (!path)
path = git_path("shallow");
/*
* fetch-pack sets '--shallow-file ""' as an indicator that no
* shallow file should be used. We could just open it and it
* will likely fail. But let's do an explicit check instead.
*/
if (!*path || (fp = fopen(path, "r")) == NULL) {
stat_validity_clear(&shallow_stat);
is_shallow = 0;
return is_shallow;
}
stat_validity_update(&shallow_stat, fileno(fp));
is_shallow = 1;
while (fgets(buf, sizeof(buf), fp)) {
unsigned char sha1[20];
if (get_sha1_hex(buf, sha1))
die("bad shallow line: %s", buf);
register_shallow(sha1);
}
fclose(fp);
return is_shallow;
}
struct commit_list *get_shallow_commits(struct object_array *heads, int depth,
int shallow_flag, int not_shallow_flag)
{
int i = 0, cur_depth = 0;
struct commit_list *result = NULL;
struct object_array stack = OBJECT_ARRAY_INIT;
struct commit *commit = NULL;
struct commit_graft *graft;
while (commit || i < heads->nr || stack.nr) {
struct commit_list *p;
if (!commit) {
if (i < heads->nr) {
commit = (struct commit *)
deref_tag(heads->objects[i++].item, NULL, 0);
if (!commit || commit->object.type != OBJ_COMMIT) {
commit = NULL;
continue;
}
if (!commit->util)
commit->util = xmalloc(sizeof(int));
*(int *)commit->util = 0;
cur_depth = 0;
} else {
commit = (struct commit *)
stack.objects[--stack.nr].item;
cur_depth = *(int *)commit->util;
}
}
parse_commit_or_die(commit);
cur_depth++;
if ((depth != INFINITE_DEPTH && cur_depth >= depth) ||
(is_repository_shallow() && !commit->parents &&
(graft = lookup_commit_graft(commit->object.sha1)) != NULL &&
graft->nr_parent < 0)) {
commit_list_insert(commit, &result);
commit->object.flags |= shallow_flag;
commit = NULL;
continue;
}
commit->object.flags |= not_shallow_flag;
for (p = commit->parents, commit = NULL; p; p = p->next) {
if (!p->item->util) {
int *pointer = xmalloc(sizeof(int));
p->item->util = pointer;
*pointer = cur_depth;
} else {
int *pointer = p->item->util;
if (cur_depth >= *pointer)
continue;
*pointer = cur_depth;
}
if (p->next)
add_object_array(&p->item->object,
NULL, &stack);
else {
commit = p->item;
cur_depth = *(int *)commit->util;
}
}
}
return result;
}
static void check_shallow_file_for_update(void)
{
if (is_shallow == -1)
die("BUG: shallow must be initialized by now");
if (!stat_validity_check(&shallow_stat, git_path("shallow")))
die("shallow file has changed since we read it");
}
#define SEEN_ONLY 1
#define VERBOSE 2
struct write_shallow_data {
struct strbuf *out;
int use_pack_protocol;
int count;
unsigned flags;
};
static int write_one_shallow(const struct commit_graft *graft, void *cb_data)
{
struct write_shallow_data *data = cb_data;
const char *hex = sha1_to_hex(graft->sha1);
if (graft->nr_parent != -1)
return 0;
if (data->flags & SEEN_ONLY) {
struct commit *c = lookup_commit(graft->sha1);
if (!c || !(c->object.flags & SEEN)) {
if (data->flags & VERBOSE)
printf("Removing %s from .git/shallow\n",
sha1_to_hex(c->object.sha1));
return 0;
}
}
data->count++;
if (data->use_pack_protocol)
packet_buf_write(data->out, "shallow %s", hex);
else {
strbuf_addstr(data->out, hex);
strbuf_addch(data->out, '\n');
}
return 0;
}
static int write_shallow_commits_1(struct strbuf *out, int use_pack_protocol,
const struct sha1_array *extra,
unsigned flags)
{
struct write_shallow_data data;
int i;
data.out = out;
data.use_pack_protocol = use_pack_protocol;
data.count = 0;
data.flags = flags;
for_each_commit_graft(write_one_shallow, &data);
if (!extra)
return data.count;
for (i = 0; i < extra->nr; i++) {
strbuf_addstr(out, sha1_to_hex(extra->sha1[i]));
strbuf_addch(out, '\n');
data.count++;
}
return data.count;
}
int write_shallow_commits(struct strbuf *out, int use_pack_protocol,
const struct sha1_array *extra)
{
return write_shallow_commits_1(out, use_pack_protocol, extra, 0);
}
static struct strbuf temporary_shallow = STRBUF_INIT;
static void remove_temporary_shallow(void)
{
if (temporary_shallow.len) {
unlink_or_warn(temporary_shallow.buf);
strbuf_reset(&temporary_shallow);
}
}
static void remove_temporary_shallow_on_signal(int signo)
{
remove_temporary_shallow();
sigchain_pop(signo);
raise(signo);
}
const char *setup_temporary_shallow(const struct sha1_array *extra)
{
struct strbuf sb = STRBUF_INIT;
int fd;
if (temporary_shallow.len)
die("BUG: attempt to create two temporary shallow files");
if (write_shallow_commits(&sb, 0, extra)) {
strbuf_addstr(&temporary_shallow, git_path("shallow_XXXXXX"));
fd = xmkstemp(temporary_shallow.buf);
atexit(remove_temporary_shallow);
sigchain_push_common(remove_temporary_shallow_on_signal);
if (write_in_full(fd, sb.buf, sb.len) != sb.len)
die_errno("failed to write to %s",
temporary_shallow.buf);
close(fd);
strbuf_release(&sb);
return temporary_shallow.buf;
}
/*
* is_repository_shallow() sees empty string as "no shallow
* file".
*/
return temporary_shallow.buf;
}
void setup_alternate_shallow(struct lock_file *shallow_lock,
const char **alternate_shallow_file,
const struct sha1_array *extra)
{
struct strbuf sb = STRBUF_INIT;
int fd;
fd = hold_lock_file_for_update(shallow_lock, git_path("shallow"),
LOCK_DIE_ON_ERROR);
check_shallow_file_for_update();
if (write_shallow_commits(&sb, 0, extra)) {
if (write_in_full(fd, sb.buf, sb.len) != sb.len)
die_errno("failed to write to %s",
shallow_lock->filename.buf);
*alternate_shallow_file = shallow_lock->filename.buf;
} else
/*
* is_repository_shallow() sees empty string as "no
* shallow file".
*/
*alternate_shallow_file = "";
strbuf_release(&sb);
}
static int advertise_shallow_grafts_cb(const struct commit_graft *graft, void *cb)
{
int fd = *(int *)cb;
if (graft->nr_parent == -1)
packet_write(fd, "shallow %s\n", sha1_to_hex(graft->sha1));
return 0;
}
void advertise_shallow_grafts(int fd)
{
if (!is_repository_shallow())
return;
for_each_commit_graft(advertise_shallow_grafts_cb, &fd);
}
/*
* mark_reachable_objects() should have been run prior to this and all
* reachable commits marked as "SEEN".
*/
void prune_shallow(int show_only)
{
static struct lock_file shallow_lock;
struct strbuf sb = STRBUF_INIT;
int fd;
if (show_only) {
write_shallow_commits_1(&sb, 0, NULL, SEEN_ONLY | VERBOSE);
strbuf_release(&sb);
return;
}
fd = hold_lock_file_for_update(&shallow_lock, git_path("shallow"),
LOCK_DIE_ON_ERROR);
check_shallow_file_for_update();
if (write_shallow_commits_1(&sb, 0, NULL, SEEN_ONLY)) {
if (write_in_full(fd, sb.buf, sb.len) != sb.len)
die_errno("failed to write to %s",
shallow_lock.filename.buf);
commit_lock_file(&shallow_lock);
} else {
unlink(git_path("shallow"));
rollback_lock_file(&shallow_lock);
}
strbuf_release(&sb);
}
struct trace_key trace_shallow = TRACE_KEY_INIT(SHALLOW);
/*
* Step 1, split sender shallow commits into "ours" and "theirs"
* Step 2, clean "ours" based on .git/shallow
*/
void prepare_shallow_info(struct shallow_info *info, struct sha1_array *sa)
{
int i;
trace_printf_key(&trace_shallow, "shallow: prepare_shallow_info\n");
memset(info, 0, sizeof(*info));
info->shallow = sa;
if (!sa)
return;
info->ours = xmalloc(sizeof(*info->ours) * sa->nr);
info->theirs = xmalloc(sizeof(*info->theirs) * sa->nr);
for (i = 0; i < sa->nr; i++) {
if (has_sha1_file(sa->sha1[i])) {
struct commit_graft *graft;
graft = lookup_commit_graft(sa->sha1[i]);
if (graft && graft->nr_parent < 0)
continue;
info->ours[info->nr_ours++] = i;
} else
info->theirs[info->nr_theirs++] = i;
}
}
void clear_shallow_info(struct shallow_info *info)
{
free(info->ours);
free(info->theirs);
}
/* Step 4, remove non-existent ones in "theirs" after getting the pack */
void remove_nonexistent_theirs_shallow(struct shallow_info *info)
{
unsigned char (*sha1)[20] = info->shallow->sha1;
int i, dst;
trace_printf_key(&trace_shallow, "shallow: remove_nonexistent_theirs_shallow\n");
for (i = dst = 0; i < info->nr_theirs; i++) {
if (i != dst)
info->theirs[dst] = info->theirs[i];
if (has_sha1_file(sha1[info->theirs[i]]))
dst++;
}
info->nr_theirs = dst;
}
define_commit_slab(ref_bitmap, uint32_t *);
struct paint_info {
struct ref_bitmap ref_bitmap;
unsigned nr_bits;
char **slab;
char *free, *end;
unsigned slab_count;
};
static uint32_t *paint_alloc(struct paint_info *info)
{
unsigned nr = (info->nr_bits + 31) / 32;
unsigned size = nr * sizeof(uint32_t);
void *p;
if (!info->slab_count || info->free + size > info->end) {
info->slab_count++;
REALLOC_ARRAY(info->slab, info->slab_count);
info->free = xmalloc(COMMIT_SLAB_SIZE);
info->slab[info->slab_count - 1] = info->free;
info->end = info->free + COMMIT_SLAB_SIZE;
}
p = info->free;
info->free += size;
return p;
}
/*
* Given a commit SHA-1, walk down to parents until either SEEN,
* UNINTERESTING or BOTTOM is hit. Set the id-th bit in ref_bitmap for
* all walked commits.
*/
static void paint_down(struct paint_info *info, const unsigned char *sha1,
int id)
{
unsigned int i, nr;
struct commit_list *head = NULL;
int bitmap_nr = (info->nr_bits + 31) / 32;
int bitmap_size = bitmap_nr * sizeof(uint32_t);
uint32_t *tmp = xmalloc(bitmap_size); /* to be freed before return */
uint32_t *bitmap = paint_alloc(info);
struct commit *c = lookup_commit_reference_gently(sha1, 1);
if (!c)
return;
memset(bitmap, 0, bitmap_size);
bitmap[id / 32] |= (1 << (id % 32));
commit_list_insert(c, &head);
while (head) {
struct commit_list *p;
struct commit *c = head->item;
uint32_t **refs = ref_bitmap_at(&info->ref_bitmap, c);
p = head;
head = head->next;
free(p);
/* XXX check "UNINTERESTING" from pack bitmaps if available */
if (c->object.flags & (SEEN | UNINTERESTING))
continue;
else
c->object.flags |= SEEN;
if (*refs == NULL)
*refs = bitmap;
else {
memcpy(tmp, *refs, bitmap_size);
for (i = 0; i < bitmap_nr; i++)
tmp[i] |= bitmap[i];
if (memcmp(tmp, *refs, bitmap_size)) {
*refs = paint_alloc(info);
memcpy(*refs, tmp, bitmap_size);
}
}
if (c->object.flags & BOTTOM)
continue;
if (parse_commit(c))
die("unable to parse commit %s",
sha1_to_hex(c->object.sha1));
for (p = c->parents; p; p = p->next) {
uint32_t **p_refs = ref_bitmap_at(&info->ref_bitmap,
p->item);
if (p->item->object.flags & SEEN)
continue;
if (*p_refs == NULL || *p_refs == *refs)
*p_refs = *refs;
commit_list_insert(p->item, &head);
}
}
nr = get_max_object_index();
for (i = 0; i < nr; i++) {
struct object *o = get_indexed_object(i);
if (o && o->type == OBJ_COMMIT)
o->flags &= ~SEEN;
}
free(tmp);
}
static int mark_uninteresting(const char *refname,
const unsigned char *sha1,
int flags, void *cb_data)
{
struct commit *commit = lookup_commit_reference_gently(sha1, 1);
if (!commit)
return 0;
commit->object.flags |= UNINTERESTING;
mark_parents_uninteresting(commit);
return 0;
}
static void post_assign_shallow(struct shallow_info *info,
struct ref_bitmap *ref_bitmap,
int *ref_status);
/*
* Step 6(+7), associate shallow commits with new refs
*
* info->ref must be initialized before calling this function.
*
* If used is not NULL, it's an array of info->shallow->nr
* bitmaps. The n-th bit set in the m-th bitmap if ref[n] needs the
* m-th shallow commit from info->shallow.
*
* If used is NULL, "ours" and "theirs" are updated. And if ref_status
* is not NULL it's an array of ref->nr ints. ref_status[i] is true if
* the ref needs some shallow commits from either info->ours or
* info->theirs.
*/
void assign_shallow_commits_to_refs(struct shallow_info *info,
uint32_t **used, int *ref_status)
{
unsigned char (*sha1)[20] = info->shallow->sha1;
struct sha1_array *ref = info->ref;
unsigned int i, nr;
int *shallow, nr_shallow = 0;
struct paint_info pi;
trace_printf_key(&trace_shallow, "shallow: assign_shallow_commits_to_refs\n");
shallow = xmalloc(sizeof(*shallow) * (info->nr_ours + info->nr_theirs));
for (i = 0; i < info->nr_ours; i++)
shallow[nr_shallow++] = info->ours[i];
for (i = 0; i < info->nr_theirs; i++)
shallow[nr_shallow++] = info->theirs[i];
/*
* Prepare the commit graph to track what refs can reach what
* (new) shallow commits.
*/
nr = get_max_object_index();
for (i = 0; i < nr; i++) {
struct object *o = get_indexed_object(i);
if (!o || o->type != OBJ_COMMIT)
continue;
o->flags &= ~(UNINTERESTING | BOTTOM | SEEN);
}
memset(&pi, 0, sizeof(pi));
init_ref_bitmap(&pi.ref_bitmap);
pi.nr_bits = ref->nr;
/*
* "--not --all" to cut short the traversal if new refs
* connect to old refs. If not (e.g. force ref updates) it'll
* have to go down to the current shallow commits.
*/
head_ref(mark_uninteresting, NULL);
for_each_ref(mark_uninteresting, NULL);
/* Mark potential bottoms so we won't go out of bound */
for (i = 0; i < nr_shallow; i++) {
struct commit *c = lookup_commit(sha1[shallow[i]]);
c->object.flags |= BOTTOM;
}
for (i = 0; i < ref->nr; i++)
paint_down(&pi, ref->sha1[i], i);
if (used) {
int bitmap_size = ((pi.nr_bits + 31) / 32) * sizeof(uint32_t);
memset(used, 0, sizeof(*used) * info->shallow->nr);
for (i = 0; i < nr_shallow; i++) {
const struct commit *c = lookup_commit(sha1[shallow[i]]);
uint32_t **map = ref_bitmap_at(&pi.ref_bitmap, c);
if (*map)
used[shallow[i]] = xmemdupz(*map, bitmap_size);
}
/*
* unreachable shallow commits are not removed from
* "ours" and "theirs". The user is supposed to run
* step 7 on every ref separately and not trust "ours"
* and "theirs" any more.
*/
} else
post_assign_shallow(info, &pi.ref_bitmap, ref_status);
clear_ref_bitmap(&pi.ref_bitmap);
for (i = 0; i < pi.slab_count; i++)
free(pi.slab[i]);
free(pi.slab);
free(shallow);
}
struct commit_array {
struct commit **commits;
int nr, alloc;
};
static int add_ref(const char *refname,
const unsigned char *sha1, int flags, void *cb_data)
{
struct commit_array *ca = cb_data;
ALLOC_GROW(ca->commits, ca->nr + 1, ca->alloc);
ca->commits[ca->nr] = lookup_commit_reference_gently(sha1, 1);
if (ca->commits[ca->nr])
ca->nr++;
return 0;
}
static void update_refstatus(int *ref_status, int nr, uint32_t *bitmap)
{
int i;
if (!ref_status)
return;
for (i = 0; i < nr; i++)
if (bitmap[i / 32] & (1 << (i % 32)))
ref_status[i]++;
}
/*
* Step 7, reachability test on "ours" at commit level
*/
static void post_assign_shallow(struct shallow_info *info,
struct ref_bitmap *ref_bitmap,
int *ref_status)
{
unsigned char (*sha1)[20] = info->shallow->sha1;
struct commit *c;
uint32_t **bitmap;
int dst, i, j;
int bitmap_nr = (info->ref->nr + 31) / 32;
struct commit_array ca;
trace_printf_key(&trace_shallow, "shallow: post_assign_shallow\n");
if (ref_status)
memset(ref_status, 0, sizeof(*ref_status) * info->ref->nr);
/* Remove unreachable shallow commits from "theirs" */
for (i = dst = 0; i < info->nr_theirs; i++) {
if (i != dst)
info->theirs[dst] = info->theirs[i];
c = lookup_commit(sha1[info->theirs[i]]);
bitmap = ref_bitmap_at(ref_bitmap, c);
if (!*bitmap)
continue;
for (j = 0; j < bitmap_nr; j++)
if (bitmap[0][j]) {
update_refstatus(ref_status, info->ref->nr, *bitmap);
dst++;
break;
}
}
info->nr_theirs = dst;
memset(&ca, 0, sizeof(ca));
head_ref(add_ref, &ca);
for_each_ref(add_ref, &ca);
/* Remove unreachable shallow commits from "ours" */
for (i = dst = 0; i < info->nr_ours; i++) {
if (i != dst)
info->ours[dst] = info->ours[i];
c = lookup_commit(sha1[info->ours[i]]);
bitmap = ref_bitmap_at(ref_bitmap, c);
if (!*bitmap)
continue;
for (j = 0; j < bitmap_nr; j++)
if (bitmap[0][j] &&
/* Step 7, reachability test at commit level */
!in_merge_bases_many(c, ca.nr, ca.commits)) {
update_refstatus(ref_status, info->ref->nr, *bitmap);
dst++;
break;
}
}
info->nr_ours = dst;
free(ca.commits);
}
/* (Delayed) step 7, reachability test at commit level */
int delayed_reachability_test(struct shallow_info *si, int c)
{
if (si->need_reachability_test[c]) {
struct commit *commit = lookup_commit(si->shallow->sha1[c]);
if (!si->commits) {
struct commit_array ca;
memset(&ca, 0, sizeof(ca));
head_ref(add_ref, &ca);
for_each_ref(add_ref, &ca);
si->commits = ca.commits;
si->nr_commits = ca.nr;
}
si->reachable[c] = in_merge_bases_many(commit,
si->nr_commits,
si->commits);
si->need_reachability_test[c] = 0;
}
return si->reachable[c];
}
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