config: move a few helper functions up
[git] / connected.c
1 #include "cache.h"
2 #include "run-command.h"
3 #include "sigchain.h"
4 #include "connected.h"
5 #include "transport.h"
6
7 /*
8  * If we feed all the commits we want to verify to this command
9  *
10  *  $ git rev-list --objects --stdin --not --all
11  *
12  * and if it does not error out, that means everything reachable from
13  * these commits locally exists and is connected to our existing refs.
14  * Note that this does _not_ validate the individual objects.
15  *
16  * Returns 0 if everything is connected, non-zero otherwise.
17  */
18 int check_connected(sha1_iterate_fn fn, void *cb_data,
19                     struct check_connected_options *opt)
20 {
21         struct child_process rev_list = CHILD_PROCESS_INIT;
22         struct check_connected_options defaults = CHECK_CONNECTED_INIT;
23         char commit[41];
24         unsigned char sha1[20];
25         int err = 0;
26         struct packed_git *new_pack = NULL;
27         struct transport *transport;
28         size_t base_len;
29
30         if (!opt)
31                 opt = &defaults;
32         transport = opt->transport;
33
34         if (fn(cb_data, sha1)) {
35                 if (opt->err_fd)
36                         close(opt->err_fd);
37                 return err;
38         }
39
40         if (transport && transport->smart_options &&
41             transport->smart_options->self_contained_and_connected &&
42             transport->pack_lockfile &&
43             strip_suffix(transport->pack_lockfile, ".keep", &base_len)) {
44                 struct strbuf idx_file = STRBUF_INIT;
45                 strbuf_add(&idx_file, transport->pack_lockfile, base_len);
46                 strbuf_addstr(&idx_file, ".idx");
47                 new_pack = add_packed_git(idx_file.buf, idx_file.len, 1);
48                 strbuf_release(&idx_file);
49         }
50
51         if (opt->shallow_file) {
52                 argv_array_push(&rev_list.args, "--shallow-file");
53                 argv_array_push(&rev_list.args, opt->shallow_file);
54         }
55         argv_array_push(&rev_list.args,"rev-list");
56         argv_array_push(&rev_list.args, "--objects");
57         argv_array_push(&rev_list.args, "--stdin");
58         argv_array_push(&rev_list.args, "--not");
59         argv_array_push(&rev_list.args, "--all");
60         argv_array_push(&rev_list.args, "--quiet");
61         if (opt->progress)
62                 argv_array_pushf(&rev_list.args, "--progress=%s",
63                                  _("Checking connectivity"));
64
65         rev_list.git_cmd = 1;
66         rev_list.in = -1;
67         rev_list.no_stdout = 1;
68         if (opt->err_fd)
69                 rev_list.err = opt->err_fd;
70         else
71                 rev_list.no_stderr = opt->quiet;
72
73         if (start_command(&rev_list))
74                 return error(_("Could not run 'git rev-list'"));
75
76         sigchain_push(SIGPIPE, SIG_IGN);
77
78         commit[40] = '\n';
79         do {
80                 /*
81                  * If index-pack already checked that:
82                  * - there are no dangling pointers in the new pack
83                  * - the pack is self contained
84                  * Then if the updated ref is in the new pack, then we
85                  * are sure the ref is good and not sending it to
86                  * rev-list for verification.
87                  */
88                 if (new_pack && find_pack_entry_one(sha1, new_pack))
89                         continue;
90
91                 memcpy(commit, sha1_to_hex(sha1), 40);
92                 if (write_in_full(rev_list.in, commit, 41) < 0) {
93                         if (errno != EPIPE && errno != EINVAL)
94                                 error_errno(_("failed write to rev-list"));
95                         err = -1;
96                         break;
97                 }
98         } while (!fn(cb_data, sha1));
99
100         if (close(rev_list.in))
101                 err = error_errno(_("failed to close rev-list's stdin"));
102
103         sigchain_pop(SIGPIPE);
104         return finish_command(&rev_list) || err;
105 }