diff options
Diffstat (limited to 'shallow.c')
| -rw-r--r-- | shallow.c | 138 |
1 files changed, 125 insertions, 13 deletions
@@ -1,8 +1,19 @@ #include "cache.h" #include "commit.h" #include "tag.h" +#include "pkt-line.h" static int is_shallow = -1; +static struct stat shallow_stat; +static char *alternate_shallow_file; + +void set_alternate_shallow_file(const char *path) +{ + if (is_shallow != -1) + die("BUG: is_repository_shallow must not be called before set_alternate_shallow_file"); + free(alternate_shallow_file); + alternate_shallow_file = path ? xstrdup(path) : NULL; +} int register_shallow(const unsigned char *sha1) { @@ -21,12 +32,21 @@ int is_repository_shallow(void) { FILE *fp; char buf[1024]; + const char *path = alternate_shallow_file; if (is_shallow >= 0) return is_shallow; - fp = fopen(git_path("shallow"), "r"); - if (!fp) { + 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 || + stat(path, &shallow_stat) || + (fp = fopen(path, "r")) == NULL) { is_shallow = 0; return is_shallow; } @@ -91,20 +111,112 @@ struct commit_list *get_shallow_commits(struct object_array *heads, int depth, continue; *pointer = cur_depth; } - if (cur_depth < depth) { - if (p->next) - add_object_array(&p->item->object, - NULL, &stack); - else { - commit = p->item; - cur_depth = *(int *)commit->util; - } - } else { - commit_list_insert(p->item, &result); - p->item->object.flags |= shallow_flag; + if (p->next) + add_object_array(&p->item->object, + NULL, &stack); + else { + commit = p->item; + cur_depth = *(int *)commit->util; } } } return result; } + +void check_shallow_file_for_update(void) +{ + struct stat st; + + if (!is_shallow) + return; + else if (is_shallow == -1) + die("BUG: shallow must be initialized by now"); + + if (stat(git_path("shallow"), &st)) + die("shallow file was removed during fetch"); + else if (st.st_mtime != shallow_stat.st_mtime +#ifdef USE_NSEC + || ST_MTIME_NSEC(st) != ST_MTIME_NSEC(shallow_stat) +#endif + ) + die("shallow file was changed during fetch"); +} + +struct write_shallow_data { + struct strbuf *out; + int use_pack_protocol; + int count; +}; + +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; + 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; +} + +int write_shallow_commits(struct strbuf *out, int use_pack_protocol) +{ + struct write_shallow_data data; + data.out = out; + data.use_pack_protocol = use_pack_protocol; + data.count = 0; + for_each_commit_graft(write_one_shallow, &data); + return data.count; +} + +char *setup_temporary_shallow(void) +{ + struct strbuf sb = STRBUF_INIT; + int fd; + + if (write_shallow_commits(&sb, 0)) { + struct strbuf path = STRBUF_INIT; + strbuf_addstr(&path, git_path("shallow_XXXXXX")); + fd = xmkstemp(path.buf); + if (write_in_full(fd, sb.buf, sb.len) != sb.len) + die_errno("failed to write to %s", + path.buf); + close(fd); + strbuf_release(&sb); + return strbuf_detach(&path, NULL); + } + /* + * is_repository_shallow() sees empty string as "no shallow + * file". + */ + return xstrdup(""); +} + +void setup_alternate_shallow(struct lock_file *shallow_lock, + const char **alternate_shallow_file) +{ + struct strbuf sb = STRBUF_INIT; + int fd; + + check_shallow_file_for_update(); + fd = hold_lock_file_for_update(shallow_lock, git_path("shallow"), + LOCK_DIE_ON_ERROR); + if (write_shallow_commits(&sb, 0)) { + if (write_in_full(fd, sb.buf, sb.len) != sb.len) + die_errno("failed to write to %s", + shallow_lock->filename); + *alternate_shallow_file = shallow_lock->filename; + } else + /* + * is_repository_shallow() sees empty string as "no + * shallow file". + */ + *alternate_shallow_file = ""; + strbuf_release(&sb); +} |