check_connected: relay errors to alternate descriptor
[git/git.git] / connected.c
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1#include "cache.h"
2#include "run-command.h"
3#include "sigchain.h"
4#include "connected.h"
c6807a40 5#include "transport.h"
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6
7/*
8 * If we feed all the commits we want to verify to this command
9 *
d21c463d 10 * $ git rev-list --objects --stdin --not --all
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11 *
12 * and if it does not error out, that means everything reachable from
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13 * these commits locally exists and is connected to our existing refs.
14 * Note that this does _not_ validate the individual objects.
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15 *
16 * Returns 0 if everything is connected, non-zero otherwise.
17 */
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18int check_connected(sha1_iterate_fn fn, void *cb_data,
19 struct check_connected_options *opt)
f96400cb 20{
d3180279 21 struct child_process rev_list = CHILD_PROCESS_INIT;
7043c707 22 struct check_connected_options defaults = CHECK_CONNECTED_INIT;
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23 char commit[41];
24 unsigned char sha1[20];
3be89f9b 25 int err = 0;
c6807a40 26 struct packed_git *new_pack = NULL;
7043c707 27 struct transport *transport;
26936bfd 28 size_t base_len;
f96400cb 29
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30 if (!opt)
31 opt = &defaults;
32 transport = opt->transport;
33
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34 if (fn(cb_data, sha1)) {
35 if (opt->err_fd)
36 close(opt->err_fd);
f96400cb 37 return err;
e0331849 38 }
f96400cb 39
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40 if (transport && transport->smart_options &&
41 transport->smart_options->self_contained_and_connected &&
42 transport->pack_lockfile &&
26936bfd 43 strip_suffix(transport->pack_lockfile, ".keep", &base_len)) {
c6807a40 44 struct strbuf idx_file = STRBUF_INIT;
26936bfd 45 strbuf_add(&idx_file, transport->pack_lockfile, base_len);
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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
7043c707 51 if (opt->shallow_file) {
3be89f9b 52 argv_array_push(&rev_list.args, "--shallow-file");
7043c707 53 argv_array_push(&rev_list.args, opt->shallow_file);
614db3e2 54 }
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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");
f96400cb 61
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62 rev_list.git_cmd = 1;
63 rev_list.in = -1;
64 rev_list.no_stdout = 1;
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65 if (opt->err_fd)
66 rev_list.err = opt->err_fd;
67 else
68 rev_list.no_stderr = opt->quiet;
69
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70 if (start_command(&rev_list))
71 return error(_("Could not run 'git rev-list'"));
72
73 sigchain_push(SIGPIPE, SIG_IGN);
74
75 commit[40] = '\n';
76 do {
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77 /*
78 * If index-pack already checked that:
79 * - there are no dangling pointers in the new pack
80 * - the pack is self contained
81 * Then if the updated ref is in the new pack, then we
82 * are sure the ref is good and not sending it to
83 * rev-list for verification.
84 */
85 if (new_pack && find_pack_entry_one(sha1, new_pack))
86 continue;
87
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88 memcpy(commit, sha1_to_hex(sha1), 40);
89 if (write_in_full(rev_list.in, commit, 41) < 0) {
90 if (errno != EPIPE && errno != EINVAL)
5cc026e2 91 error_errno(_("failed write to rev-list"));
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92 err = -1;
93 break;
94 }
95 } while (!fn(cb_data, sha1));
96
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97 if (close(rev_list.in))
98 err = error_errno(_("failed to close rev-list's stdin"));
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99
100 sigchain_pop(SIGPIPE);
101 return finish_command(&rev_list) || err;
102}