import: introduce new mini-daemon systemd-importd, and make machinectl a client to it

The old "systemd-import" binary is now an internal tool. We still use it
as asynchronous backend for systemd-importd. Since the import tool might
require some IO and CPU resources (due to qcow2 explosion, and
decompression), and because we might want to run it with more minimal
priviliges we still keep it around as the worker binary to execute as
child process of importd.

machinectl now has verbs for pulling down images, cancelling them and
listing them.

1 files changed, 182 insertions, 0 deletions

diff --git a/src/shared/import-util.c b/src/shared/import-util.c
new file mode 100644
index 0000000000..46671e8c99
--- /dev/null
+++ b/src/shared/import-util.c
@@ -0,0 +1,182 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+  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 "util.h"
+#include "import-util.h"
+
+int import_url_last_component(const char *url, char **ret) {
+        const char *e, *p;
+        char *s;
+
+        e = strchrnul(url, '?');
+
+        while (e > url && e[-1] == '/')
+                e--;
+
+        p = e;
+        while (p > url && p[-1] != '/')
+                p--;
+
+        if (e <= p)
+                return -EINVAL;
+
+        s = strndup(p, e - p);
+        if (!s)
+                return -ENOMEM;
+
+        *ret = s;
+        return 0;
+}
+
+
+int import_url_change_last_component(const char *url, const char *suffix, char **ret) {
+        const char *e;
+        char *s;
+
+        assert(url);
+        assert(ret);
+
+        e = strchrnul(url, '?');
+
+        while (e > url && e[-1] == '/')
+                e--;
+
+        while (e > url && e[-1] != '/')
+                e--;
+
+        if (e <= url)
+                return -EINVAL;
+
+        s = new(char, (e - url) + strlen(suffix) + 1);
+        if (!s)
+                return -ENOMEM;
+
+        strcpy(mempcpy(s, url, e - url), suffix);
+        *ret = s;
+        return 0;
+}
+
+static const char* const import_verify_table[_IMPORT_VERIFY_MAX] = {
+        [IMPORT_VERIFY_NO] = "no",
+        [IMPORT_VERIFY_SUM] = "sum",
+        [IMPORT_VERIFY_SIGNATURE] = "signature",
+};
+
+DEFINE_STRING_TABLE_LOOKUP(import_verify, ImportVerify);
+
+int tar_strip_suffixes(const char *name, char **ret) {
+        const char *e;
+        char *s;
+
+        e = endswith(name, ".tar");
+        if (!e)
+                e = endswith(name, ".tar.xz");
+        if (!e)
+                e = endswith(name, ".tar.gz");
+        if (!e)
+                e = endswith(name, ".tar.bz2");
+        if (!e)
+                e = endswith(name, ".tgz");
+        if (!e)
+                e = strchr(name, 0);
+
+        if (e <= name)
+                return -EINVAL;
+
+        s = strndup(name, e - name);
+        if (!s)
+                return -ENOMEM;
+
+        *ret = s;
+        return 0;
+}
+
+int raw_strip_suffixes(const char *p, char **ret) {
+
+        static const char suffixes[] =
+                ".xz\0"
+                ".gz\0"
+                ".bz2\0"
+                ".raw\0"
+                ".qcow2\0"
+                ".img\0"
+                ".bin\0";
+
+        _cleanup_free_ char *q = NULL;
+
+        q = strdup(p);
+        if (!q)
+                return -ENOMEM;
+
+        for (;;) {
+                const char *sfx;
+                bool changed = false;
+
+                NULSTR_FOREACH(sfx, suffixes) {
+                        char *e;
+
+                        e = endswith(q, sfx);
+                        if (e) {
+                                *e = 0;
+                                changed = true;
+                        }
+                }
+
+                if (!changed)
+                        break;
+        }
+
+        *ret = q;
+        q = NULL;
+
+        return 0;
+}
+
+bool dkr_name_is_valid(const char *name) {
+        const char *slash, *p;
+
+        if (isempty(name))
+                return false;
+
+        slash = strchr(name, '/');
+        if (!slash)
+                return false;
+
+        if (!filename_is_valid(slash + 1))
+                return false;
+
+        p = strndupa(name, slash - name);
+        if (!filename_is_valid(p))
+                return false;
+
+        return true;
+}
+
+bool dkr_id_is_valid(const char *id) {
+
+        if (!filename_is_valid(id))
+                return false;
+
+        if (!in_charset(id, "0123456789abcdef"))
+                return false;
+
+        return true;
+}