Merge pull request #4795 from poettering/dissect

Generalize image dissection logic of nspawn, and make it useful for other tools.
2016-12-10 01:08:13 -05:00
parent 2e1f244efd 58abb66f4b
commit 4a5567d5d6
26 changed files with 2234 additions and 714 deletions
@@ -0,0 +1,66 @@
+/***
+  This file is part of systemd.
+
+  Copyright 2016 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 <fcntl.h>
+#include <stdio.h>
+
+#include "dissect-image.h"
+#include "log.h"
+#include "loop-util.h"
+#include "string-util.h"
+
+int main(int argc, char *argv[]) {
+        _cleanup_(loop_device_unrefp) LoopDevice *d = NULL;
+        _cleanup_(dissected_image_unrefp) DissectedImage *m = NULL;
+        int r, i;
+
+        log_set_max_level(LOG_DEBUG);
+
+        if (argc < 2) {
+                log_error("Requires one command line argument.");
+                return EXIT_FAILURE;
+        }
+
+        r = loop_device_make_by_path(argv[1], O_RDONLY, &d);
+        if (r < 0) {
+                log_error_errno(r, "Failed to set up loopback device: %m");
+                return EXIT_FAILURE;
+        }
+
+        r = dissect_image(d->fd, NULL, 0, &m);
+        if (r < 0) {
+                log_error_errno(r, "Failed to dissect image: %m");
+                return EXIT_FAILURE;
+        }
+
+        for (i = 0; i < _PARTITION_DESIGNATOR_MAX; i++) {
+
+                if (!m->partitions[i].found)
+                        continue;
+
+                printf("Found %s partition, %s of type %s at #%i (%s)\n",
+                       partition_designator_to_string(i),
+                       m->partitions[i].rw ? "writable" : "read-only",
+                       strna(m->partitions[i].fstype),
+                       m->partitions[i].partno,
+                       strna(m->partitions[i].node));
+        }
+
+        return EXIT_SUCCESS;
+}