root/builtin/archive.c

DEFINITIONS

1. create_output_file
2. run_remote_archiver
3. cmd_archive

/*
 * Copyright (c) 2006 Franck Bui-Huu
 * Copyright (c) 2006 Rene Scharfe
 */
#include "cache.h"
#include "builtin.h"
#include "archive.h"
#include "transport.h"
#include "parse-options.h"
#include "pkt-line.h"
#include "sideband.h"

static void create_output_file(const char *output_file)
{
        int output_fd = open(output_file, O_CREAT | O_WRONLY | O_TRUNC, 0666);
        if (output_fd < 0)
                die_errno(_("could not create archive file '%s'"), output_file);
        if (output_fd != 1) {
                if (dup2(output_fd, 1) < 0)
                        die_errno(_("could not redirect output"));
                else
                        close(output_fd);
        }
}

static int run_remote_archiver(int argc, const char **argv,
                               const char *remote, const char *exec,
                               const char *name_hint)
{
        char *buf;
        int fd[2], i, rv;
        struct transport *transport;
        struct remote *_remote;

        _remote = remote_get(remote);
        if (!_remote->url[0])
                die(_("git archive: Remote with no URL"));
        transport = transport_get(_remote, _remote->url[0]);
        transport_connect(transport, "git-upload-archive", exec, fd);

        /*
         * Inject a fake --format field at the beginning of the
         * arguments, with the format inferred from our output
         * filename. This way explicit --format options can override
         * it.
         */
        if (name_hint) {
                const char *format = archive_format_from_filename(name_hint);
                if (format)
                        packet_write(fd[1], "argument --format=%s\n", format);
        }
        for (i = 1; i < argc; i++)
                packet_write(fd[1], "argument %s\n", argv[i]);
        packet_flush(fd[1]);

        buf = packet_read_line(fd[0], NULL);
        if (!buf)
                die(_("git archive: expected ACK/NAK, got EOF"));
        if (strcmp(buf, "ACK")) {
                if (starts_with(buf, "NACK "))
                        die(_("git archive: NACK %s"), buf + 5);
                if (starts_with(buf, "ERR "))
                        die(_("remote error: %s"), buf + 4);
                die(_("git archive: protocol error"));
        }

        if (packet_read_line(fd[0], NULL))
                die(_("git archive: expected a flush"));

        /* Now, start reading from fd[0] and spit it out to stdout */
        rv = recv_sideband("archive", fd[0], 1);
        rv |= transport_disconnect(transport);

        return !!rv;
}

#define PARSE_OPT_KEEP_ALL ( PARSE_OPT_KEEP_DASHDASH |  \
                             PARSE_OPT_KEEP_ARGV0 |     \
                             PARSE_OPT_KEEP_UNKNOWN |   \
                             PARSE_OPT_NO_INTERNAL_HELP )

int cmd_archive(int argc, const char **argv, const char *prefix)
{
        const char *exec = "git-upload-archive";
        const char *output = NULL;
        const char *remote = NULL;
        struct option local_opts[] = {
                OPT_STRING('o', "output", &output, N_("file"),
                        N_("write the archive to this file")),
                OPT_STRING(0, "remote", &remote, N_("repo"),
                        N_("retrieve the archive from remote repository <repo>")),
                OPT_STRING(0, "exec", &exec, N_("command"),
                        N_("path to the remote git-upload-archive command")),
                OPT_END()
        };

        argc = parse_options(argc, argv, prefix, local_opts, NULL,
                             PARSE_OPT_KEEP_ALL);

        if (output)
                create_output_file(output);

        if (remote)
                return run_remote_archiver(argc, argv, remote, exec, output);

        setvbuf(stderr, NULL, _IOLBF, BUFSIZ);

        return write_archive(argc, argv, prefix, 1, output, 0);
}