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Systemd/src/import/export.c
Lennart Poettering dccca82b1a log: minimize includes in log.h 
log.h really should only include the bare minimum of other headers, as
it is really pulled into pretty much everything else and already in
itself one of the most basic pieces of code we have.

Let's hence drop inclusion of:

1. sd-id128.h because it's entirely unneeded in current log.h
2. errno.h, dito.
3. sys/signalfd.h which we can replace by a simple struct forward
   declaration
4. process-util.h which was needed for getpid_cached() which we now hide
   in a funciton log_emergency_level() instead, which nicely abstracts
   the details away.
5. sys/socket.h which was needed for struct iovec, but a simple struct
   forward declaration suffices for that too.

Ultimately this actually makes our source tree larger (since users of
the functionality above must now include it themselves, log.h won't do
that for them), but I think it helps to untangle our web of includes a
tiny bit.

(Background: I'd like to isolate the generic bits of src/basic/ enough
so that we can do a git submodule import into casync for it)
2018-01-11 14:44:31 +01:00

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/* SPDX-License-Identifier: LGPL-2.1+ */
/***
This file is part of systemd.
Copyright 2015 Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <getopt.h>
#include "sd-event.h"
#include "sd-id128.h"
#include "alloc-util.h"
#include "export-raw.h"
#include "export-tar.h"
#include "fd-util.h"
#include "fs-util.h"
#include "hostname-util.h"
#include "import-util.h"
#include "machine-image.h"
#include "signal-util.h"
#include "string-util.h"
#include "verbs.h"
static ImportCompressType arg_compress = IMPORT_COMPRESS_UNKNOWN;
static void determine_compression_from_filename(const char *p) {
if (arg_compress != IMPORT_COMPRESS_UNKNOWN)
return;
if (!p) {
arg_compress = IMPORT_COMPRESS_UNCOMPRESSED;
return;
}
if (endswith(p, ".xz"))
arg_compress = IMPORT_COMPRESS_XZ;
else if (endswith(p, ".gz"))
arg_compress = IMPORT_COMPRESS_GZIP;
else if (endswith(p, ".bz2"))
arg_compress = IMPORT_COMPRESS_BZIP2;
else
arg_compress = IMPORT_COMPRESS_UNCOMPRESSED;
}
static int interrupt_signal_handler(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) {
log_notice("Transfer aborted.");
sd_event_exit(sd_event_source_get_event(s), EINTR);
return 0;
}
static void on_tar_finished(TarExport *export, int error, void *userdata) {
sd_event *event = userdata;
assert(export);
if (error == 0)
log_info("Operation completed successfully.");
sd_event_exit(event, abs(error));
}
static int export_tar(int argc, char *argv[], void *userdata) {
_cleanup_(tar_export_unrefp) TarExport *export = NULL;
_cleanup_(sd_event_unrefp) sd_event *event = NULL;
_cleanup_(image_unrefp) Image *image = NULL;
const char *path = NULL, *local = NULL;
_cleanup_close_ int open_fd = -1;
int r, fd;
if (machine_name_is_valid(argv[1])) {
r = image_find(argv[1], &image);
if (r < 0)
return log_error_errno(r, "Failed to look for machine %s: %m", argv[1]);
if (r == 0) {
log_error("Machine image %s not found.", argv[1]);
return -ENOENT;
}
local = image->path;
} else
local = argv[1];
if (argc >= 3)
path = argv[2];
if (isempty(path) || streq(path, "-"))
path = NULL;
determine_compression_from_filename(path);
if (path) {
open_fd = open(path, O_WRONLY|O_CREAT|O_TRUNC|O_CLOEXEC|O_NOCTTY, 0666);
if (open_fd < 0)
return log_error_errno(errno, "Failed to open tar image for export: %m");
fd = open_fd;
log_info("Exporting '%s', saving to '%s' with compression '%s'.", local, path, import_compress_type_to_string(arg_compress));
} else {
_cleanup_free_ char *pretty = NULL;
fd = STDOUT_FILENO;
(void) readlink_malloc("/proc/self/fd/1", &pretty);
log_info("Exporting '%s', saving to '%s' with compression '%s'.", local, strna(pretty), import_compress_type_to_string(arg_compress));
}
r = sd_event_default(&event);
if (r < 0)
return log_error_errno(r, "Failed to allocate event loop: %m");
assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGTERM, SIGINT, -1) >= 0);
(void) sd_event_add_signal(event, NULL, SIGTERM, interrupt_signal_handler, NULL);
(void) sd_event_add_signal(event, NULL, SIGINT, interrupt_signal_handler, NULL);
r = tar_export_new(&export, event, on_tar_finished, event);
if (r < 0)
return log_error_errno(r, "Failed to allocate exporter: %m");
r = tar_export_start(export, local, fd, arg_compress);
if (r < 0)
return log_error_errno(r, "Failed to export image: %m");
r = sd_event_loop(event);
if (r < 0)
return log_error_errno(r, "Failed to run event loop: %m");
log_info("Exiting.");
return -r;
}
static void on_raw_finished(RawExport *export, int error, void *userdata) {
sd_event *event = userdata;
assert(export);
if (error == 0)
log_info("Operation completed successfully.");
sd_event_exit(event, abs(error));
}
static int export_raw(int argc, char *argv[], void *userdata) {
_cleanup_(raw_export_unrefp) RawExport *export = NULL;
_cleanup_(sd_event_unrefp) sd_event *event = NULL;
_cleanup_(image_unrefp) Image *image = NULL;
const char *path = NULL, *local = NULL;
_cleanup_close_ int open_fd = -1;
int r, fd;
if (machine_name_is_valid(argv[1])) {
r = image_find(argv[1], &image);
if (r < 0)
return log_error_errno(r, "Failed to look for machine %s: %m", argv[1]);
if (r == 0) {
log_error("Machine image %s not found.", argv[1]);
return -ENOENT;
}
local = image->path;
} else
local = argv[1];
if (argc >= 3)
path = argv[2];
if (isempty(path) || streq(path, "-"))
path = NULL;
determine_compression_from_filename(path);
if (path) {
open_fd = open(path, O_WRONLY|O_CREAT|O_TRUNC|O_CLOEXEC|O_NOCTTY, 0666);
if (open_fd < 0)
return log_error_errno(errno, "Failed to open raw image for export: %m");
fd = open_fd;
log_info("Exporting '%s', saving to '%s' with compression '%s'.", local, path, import_compress_type_to_string(arg_compress));
} else {
_cleanup_free_ char *pretty = NULL;
fd = STDOUT_FILENO;
(void) readlink_malloc("/proc/self/fd/1", &pretty);
log_info("Exporting '%s', saving to '%s' with compression '%s'.", local, strna(pretty), import_compress_type_to_string(arg_compress));
}
r = sd_event_default(&event);
if (r < 0)
return log_error_errno(r, "Failed to allocate event loop: %m");
assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGTERM, SIGINT, -1) >= 0);
(void) sd_event_add_signal(event, NULL, SIGTERM, interrupt_signal_handler, NULL);
(void) sd_event_add_signal(event, NULL, SIGINT, interrupt_signal_handler, NULL);
r = raw_export_new(&export, event, on_raw_finished, event);
if (r < 0)
return log_error_errno(r, "Failed to allocate exporter: %m");
r = raw_export_start(export, local, fd, arg_compress);
if (r < 0)
return log_error_errno(r, "Failed to export image: %m");
r = sd_event_loop(event);
if (r < 0)
return log_error_errno(r, "Failed to run event loop: %m");
log_info("Exiting.");
return -r;
}
static int help(int argc, char *argv[], void *userdata) {
printf("%s [OPTIONS...] {COMMAND} ...\n\n"
"Export container or virtual machine images.\n\n"
" -h --help Show this help\n"
" --version Show package version\n"
" --format=FORMAT Select format\n\n"
"Commands:\n"
" tar NAME [FILE] Export a TAR image\n"
" raw NAME [FILE] Export a RAW image\n",
program_invocation_short_name);
return 0;
}
static int parse_argv(int argc, char *argv[]) {
enum {
ARG_VERSION = 0x100,
ARG_FORMAT,
};
static const struct option options[] = {
{ "help", no_argument, NULL, 'h' },
{ "version", no_argument, NULL, ARG_VERSION },
{ "format", required_argument, NULL, ARG_FORMAT },
{}
};
int c;
assert(argc >= 0);
assert(argv);
while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
switch (c) {
case 'h':
return help(0, NULL, NULL);
case ARG_VERSION:
return version();
case ARG_FORMAT:
if (streq(optarg, "uncompressed"))
arg_compress = IMPORT_COMPRESS_UNCOMPRESSED;
else if (streq(optarg, "xz"))
arg_compress = IMPORT_COMPRESS_XZ;
else if (streq(optarg, "gzip"))
arg_compress = IMPORT_COMPRESS_GZIP;
else if (streq(optarg, "bzip2"))
arg_compress = IMPORT_COMPRESS_BZIP2;
else {
log_error("Unknown format: %s", optarg);
return -EINVAL;
}
break;
case '?':
return -EINVAL;
default:
assert_not_reached("Unhandled option");
}
return 1;
}
static int export_main(int argc, char *argv[]) {
static const Verb verbs[] = {
{ "help", VERB_ANY, VERB_ANY, 0, help },
{ "tar", 2, 3, 0, export_tar },
{ "raw", 2, 3, 0, export_raw },
{}
};
return dispatch_verb(argc, argv, verbs, NULL);
}
int main(int argc, char *argv[]) {
int r;
setlocale(LC_ALL, "");
log_parse_environment();
log_open();
r = parse_argv(argc, argv);
if (r <= 0)
goto finish;
(void) ignore_signals(SIGPIPE, -1);
r = export_main(argc, argv);
finish:
return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
}
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