root/connected.c

DEFINITIONS

1. check_everything_connected
2. check_everything_connected_real
3. check_everything_connected_with_transport
4. check_shallow_connected

#include "cache.h"
#include "run-command.h"
#include "sigchain.h"
#include "connected.h"
#include "transport.h"

int check_everything_connected(sha1_iterate_fn fn, int quiet, void *cb_data)
{
        return check_everything_connected_with_transport(fn, quiet, cb_data, NULL);
}
/*
 * If we feed all the commits we want to verify to this command
 *
 *  $ git rev-list --objects --stdin --not --all
 *
 * and if it does not error out, that means everything reachable from
 * these commits locally exists and is connected to our existing refs.
 * Note that this does _not_ validate the individual objects.
 *
 * Returns 0 if everything is connected, non-zero otherwise.
 */
static int check_everything_connected_real(sha1_iterate_fn fn,
                                           int quiet,
                                           void *cb_data,
                                           struct transport *transport,
                                           const char *shallow_file)
{
        struct child_process rev_list = CHILD_PROCESS_INIT;
        const char *argv[9];
        char commit[41];
        unsigned char sha1[20];
        int err = 0, ac = 0;
        struct packed_git *new_pack = NULL;
        size_t base_len;

        if (fn(cb_data, sha1))
                return err;

        if (transport && transport->smart_options &&
            transport->smart_options->self_contained_and_connected &&
            transport->pack_lockfile &&
            strip_suffix(transport->pack_lockfile, ".keep", &base_len)) {
                struct strbuf idx_file = STRBUF_INIT;
                strbuf_add(&idx_file, transport->pack_lockfile, base_len);
                strbuf_addstr(&idx_file, ".idx");
                new_pack = add_packed_git(idx_file.buf, idx_file.len, 1);
                strbuf_release(&idx_file);
        }

        if (shallow_file) {
                argv[ac++] = "--shallow-file";
                argv[ac++] = shallow_file;
        }
        argv[ac++] = "rev-list";
        argv[ac++] = "--objects";
        argv[ac++] = "--stdin";
        argv[ac++] = "--not";
        argv[ac++] = "--all";
        if (quiet)
                argv[ac++] = "--quiet";
        argv[ac] = NULL;

        rev_list.argv = argv;
        rev_list.git_cmd = 1;
        rev_list.in = -1;
        rev_list.no_stdout = 1;
        rev_list.no_stderr = quiet;
        if (start_command(&rev_list))
                return error(_("Could not run 'git rev-list'"));

        sigchain_push(SIGPIPE, SIG_IGN);

        commit[40] = '\n';
        do {
                /*
                 * If index-pack already checked that:
                 * - there are no dangling pointers in the new pack
                 * - the pack is self contained
                 * Then if the updated ref is in the new pack, then we
                 * are sure the ref is good and not sending it to
                 * rev-list for verification.
                 */
                if (new_pack && find_pack_entry_one(sha1, new_pack))
                        continue;

                memcpy(commit, sha1_to_hex(sha1), 40);
                if (write_in_full(rev_list.in, commit, 41) < 0) {
                        if (errno != EPIPE && errno != EINVAL)
                                error(_("failed write to rev-list: %s"),
                                      strerror(errno));
                        err = -1;
                        break;
                }
        } while (!fn(cb_data, sha1));

        if (close(rev_list.in)) {
                error(_("failed to close rev-list's stdin: %s"), strerror(errno));
                err = -1;
        }

        sigchain_pop(SIGPIPE);
        return finish_command(&rev_list) || err;
}

int check_everything_connected_with_transport(sha1_iterate_fn fn,
                                              int quiet,
                                              void *cb_data,
                                              struct transport *transport)
{
        return check_everything_connected_real(fn, quiet, cb_data,
                                               transport, NULL);
}

int check_shallow_connected(sha1_iterate_fn fn, int quiet, void *cb_data,
                            const char *shallow_file)
{
        return check_everything_connected_real(fn, quiet, cb_data,
                                               NULL, shallow_file);
}