Merge branch 'po/git-help-on-git-itself'
[git] / connected.c
1 #include "cache.h"
2 #include "object-store.h"
3 #include "run-command.h"
4 #include "sigchain.h"
5 #include "connected.h"
6 #include "transport.h"
7 #include "packfile.h"
8
9 /*
10  * If we feed all the commits we want to verify to this command
11  *
12  *  $ git rev-list --objects --stdin --not --all
13  *
14  * and if it does not error out, that means everything reachable from
15  * these commits locally exists and is connected to our existing refs.
16  * Note that this does _not_ validate the individual objects.
17  *
18  * Returns 0 if everything is connected, non-zero otherwise.
19  */
20 int check_connected(oid_iterate_fn fn, void *cb_data,
21                     struct check_connected_options *opt)
22 {
23         struct child_process rev_list = CHILD_PROCESS_INIT;
24         struct check_connected_options defaults = CHECK_CONNECTED_INIT;
25         char commit[GIT_MAX_HEXSZ + 1];
26         struct object_id oid;
27         int err = 0;
28         struct packed_git *new_pack = NULL;
29         struct transport *transport;
30         size_t base_len;
31
32         if (!opt)
33                 opt = &defaults;
34         transport = opt->transport;
35
36         if (fn(cb_data, &oid)) {
37                 if (opt->err_fd)
38                         close(opt->err_fd);
39                 return err;
40         }
41
42         if (transport && transport->smart_options &&
43             transport->smart_options->self_contained_and_connected &&
44             transport->pack_lockfile &&
45             strip_suffix(transport->pack_lockfile, ".keep", &base_len)) {
46                 struct strbuf idx_file = STRBUF_INIT;
47                 strbuf_add(&idx_file, transport->pack_lockfile, base_len);
48                 strbuf_addstr(&idx_file, ".idx");
49                 new_pack = add_packed_git(idx_file.buf, idx_file.len, 1);
50                 strbuf_release(&idx_file);
51         }
52
53         if (opt->check_refs_only) {
54                 /*
55                  * For partial clones, we don't want to have to do a regular
56                  * connectivity check because we have to enumerate and exclude
57                  * all promisor objects (slow), and then the connectivity check
58                  * itself becomes a no-op because in a partial clone every
59                  * object is a promisor object. Instead, just make sure we
60                  * received the objects pointed to by each wanted ref.
61                  */
62                 do {
63                         if (!repo_has_object_file(the_repository, &oid))
64                                 return 1;
65                 } while (!fn(cb_data, &oid));
66                 return 0;
67         }
68
69         if (opt->shallow_file) {
70                 argv_array_push(&rev_list.args, "--shallow-file");
71                 argv_array_push(&rev_list.args, opt->shallow_file);
72         }
73         argv_array_push(&rev_list.args,"rev-list");
74         argv_array_push(&rev_list.args, "--objects");
75         argv_array_push(&rev_list.args, "--stdin");
76         if (repository_format_partial_clone)
77                 argv_array_push(&rev_list.args, "--exclude-promisor-objects");
78         if (!opt->is_deepening_fetch) {
79                 argv_array_push(&rev_list.args, "--not");
80                 argv_array_push(&rev_list.args, "--all");
81         }
82         argv_array_push(&rev_list.args, "--quiet");
83         if (opt->progress)
84                 argv_array_pushf(&rev_list.args, "--progress=%s",
85                                  _("Checking connectivity"));
86
87         rev_list.git_cmd = 1;
88         rev_list.env = opt->env;
89         rev_list.in = -1;
90         rev_list.no_stdout = 1;
91         if (opt->err_fd)
92                 rev_list.err = opt->err_fd;
93         else
94                 rev_list.no_stderr = opt->quiet;
95
96         if (start_command(&rev_list))
97                 return error(_("Could not run 'git rev-list'"));
98
99         sigchain_push(SIGPIPE, SIG_IGN);
100
101         commit[GIT_SHA1_HEXSZ] = '\n';
102         do {
103                 /*
104                  * If index-pack already checked that:
105                  * - there are no dangling pointers in the new pack
106                  * - the pack is self contained
107                  * Then if the updated ref is in the new pack, then we
108                  * are sure the ref is good and not sending it to
109                  * rev-list for verification.
110                  */
111                 if (new_pack && find_pack_entry_one(oid.hash, new_pack))
112                         continue;
113
114                 memcpy(commit, oid_to_hex(&oid), GIT_SHA1_HEXSZ);
115                 if (write_in_full(rev_list.in, commit, GIT_SHA1_HEXSZ + 1) < 0) {
116                         if (errno != EPIPE && errno != EINVAL)
117                                 error_errno(_("failed write to rev-list"));
118                         err = -1;
119                         break;
120                 }
121         } while (!fn(cb_data, &oid));
122
123         if (close(rev_list.in))
124                 err = error_errno(_("failed to close rev-list's stdin"));
125
126         sigchain_pop(SIGPIPE);
127         return finish_command(&rev_list) || err;
128 }