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-rw-r--r--.gitignore1
-rw-r--r--Makefile.am12
l---------src/dissect/Makefile1
-rw-r--r--src/dissect/dissect.c206
-rw-r--r--src/shared/loop-util.c13
-rw-r--r--src/shared/loop-util.h4
6 files changed, 234 insertions, 3 deletions
diff --git a/.gitignore b/.gitignore
index 405b07ef4d..baa975d813 100644
--- a/.gitignore
+++ b/.gitignore
@@ -67,6 +67,7 @@
/systemd-debug-generator
/systemd-delta
/systemd-detect-virt
+/systemd-dissect
/systemd-escape
/systemd-export
/systemd-firstboot
diff --git a/Makefile.am b/Makefile.am
index c47a07a1f0..c6adf3a65c 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -404,6 +404,11 @@ rootlibexec_PROGRAMS = \
systemd-socket-proxyd \
systemd-update-done
+if HAVE_BLKID
+rootlibexec_PROGRAMS += \
+ systemd-dissect
+endif
+
if HAVE_UTMP
rootlibexec_PROGRAMS += \
systemd-update-utmp
@@ -3074,6 +3079,13 @@ systemd_notify_LDADD = \
libsystemd-shared.la
# ------------------------------------------------------------------------------
+systemd_dissect_SOURCES = \
+ src/dissect/dissect.c
+
+systemd_dissect_LDADD = \
+ libsystemd-shared.la
+
+# ------------------------------------------------------------------------------
systemd_path_SOURCES = \
src/path/path.c
diff --git a/src/dissect/Makefile b/src/dissect/Makefile
new file mode 120000
index 0000000000..d0b0e8e008
--- /dev/null
+++ b/src/dissect/Makefile
@@ -0,0 +1 @@
+../Makefile \ No newline at end of file
diff --git a/src/dissect/dissect.c b/src/dissect/dissect.c
new file mode 100644
index 0000000000..93ece05948
--- /dev/null
+++ b/src/dissect/dissect.c
@@ -0,0 +1,206 @@
+/***
+ 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 <getopt.h>
+
+#include "architecture.h"
+#include "dissect-image.h"
+#include "log.h"
+#include "loop-util.h"
+#include "string-util.h"
+#include "util.h"
+
+static enum {
+ ACTION_DISSECT,
+ ACTION_MOUNT,
+} arg_action = ACTION_DISSECT;
+static const char *arg_image = NULL;
+static const char *arg_path = NULL;
+static bool arg_read_only = false;
+
+static void help(void) {
+ printf("%s [OPTIONS...] IMAGE\n"
+ "%s [OPTIONS...] --mount IMAGE PATH\n"
+ "Dissect a file system OS image.\n\n"
+ " -h --help Show this help\n"
+ " --version Show package version\n"
+ " -m --mount Mount the image to the specified directory\n"
+ " -r --read-only Mount read-only\n",
+ program_invocation_short_name,
+ program_invocation_short_name);
+}
+
+static int parse_argv(int argc, char *argv[]) {
+
+ enum {
+ ARG_VERSION = 0x100,
+ };
+
+ static const struct option options[] = {
+ { "help", no_argument, NULL, 'h' },
+ { "version", no_argument, NULL, ARG_VERSION },
+ { "mount", no_argument, NULL, 'm' },
+ { "read-only", no_argument, NULL, 'r' },
+ {}
+ };
+
+ int c;
+
+ assert(argc >= 0);
+ assert(argv);
+
+ while ((c = getopt_long(argc, argv, "hmr", options, NULL)) >= 0) {
+
+ switch (c) {
+
+ case 'h':
+ help();
+ return 0;
+
+ case ARG_VERSION:
+ return version();
+
+ case 'm':
+ arg_action = ACTION_MOUNT;
+ break;
+
+ case 'r':
+ arg_read_only = true;
+ break;
+
+ case '?':
+ return -EINVAL;
+
+ default:
+ assert_not_reached("Unhandled option");
+ }
+
+ }
+
+ switch (arg_action) {
+
+ case ACTION_DISSECT:
+ if (optind + 1 != argc) {
+ log_error("Expected a file path as only argument.");
+ return -EINVAL;
+ }
+
+ arg_image = argv[optind];
+ arg_read_only = true;
+ break;
+
+ case ACTION_MOUNT:
+ if (optind + 2 != argc) {
+ log_error("Expected a file path and mount point path as only arguments.");
+ return -EINVAL;
+ }
+
+ arg_image = argv[optind];
+ arg_path = argv[optind + 1];
+ break;
+
+ default:
+ assert_not_reached("Unknown action.");
+ }
+
+ return 1;
+}
+
+int main(int argc, char *argv[]) {
+ _cleanup_(loop_device_unrefp) LoopDevice *d = NULL;
+ _cleanup_(dissected_image_unrefp) DissectedImage *m = NULL;
+ int r;
+
+ log_parse_environment();
+ log_open();
+
+ r = parse_argv(argc, argv);
+ if (r <= 0)
+ goto finish;
+
+ r = loop_device_make_by_path(arg_image, arg_read_only ? O_RDONLY : O_RDWR, &d);
+ if (r < 0) {
+ log_error_errno(r, "Failed to set up loopback device: %m");
+ goto finish;
+ }
+
+ r = dissect_image(d->fd, &m);
+ if (r == -ENOPKG) {
+ log_error_errno(r, "Couldn't identify a suitable partition table or file system in %s.", arg_image);
+ goto finish;
+ }
+ if (r < 0) {
+ log_error_errno(r, "Failed to dissect image: %m");
+ goto finish;
+ }
+
+ switch (arg_action) {
+
+ case ACTION_DISSECT: {
+ unsigned i;
+
+ for (i = 0; i < _PARTITION_DESIGNATOR_MAX; i++) {
+ DissectedPartition *p = m->partitions + i;
+
+ if (!p->found)
+ continue;
+
+ printf("Found %s '%s' partition",
+ p->rw ? "writable" : "read-only",
+ partition_designator_to_string(i));
+
+ if (p->fstype)
+ printf(" of type %s", p->fstype);
+
+ if (p->architecture != _ARCHITECTURE_INVALID)
+ printf(" for %s", architecture_to_string(p->architecture));
+
+ if (p->partno >= 0)
+ printf(" on partition #%i", p->partno);
+
+ if (p->node)
+ printf(" (%s)", p->node);
+
+ putchar('\n');
+ }
+
+ break;
+ }
+
+ case ACTION_MOUNT:
+ r = dissected_image_mount(m, arg_path,
+ (arg_read_only ? DISSECTED_IMAGE_READ_ONLY : 0) |
+ DISSECTED_IMAGE_DISCARD_ON_LOOP);
+ if (r < 0) {
+ log_error_errno(r, "Failed to mount image: %m");
+ goto finish;
+ }
+
+ loop_device_relinquish(d);
+ break;
+
+ default:
+ assert_not_reached("Unknown action.");
+ }
+
+finish:
+ return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
+}
diff --git a/src/shared/loop-util.c b/src/shared/loop-util.c
index 8be4dbf938..047e213634 100644
--- a/src/shared/loop-util.c
+++ b/src/shared/loop-util.c
@@ -129,7 +129,7 @@ LoopDevice* loop_device_unref(LoopDevice *d) {
if (d->fd >= 0) {
- if (d->nr >= 0) {
+ if (d->nr >= 0 && !d->relinquished) {
if (ioctl(d->fd, LOOP_CLR_FD) < 0)
log_debug_errno(errno, "Failed to clear loop device: %m");
@@ -138,7 +138,7 @@ LoopDevice* loop_device_unref(LoopDevice *d) {
safe_close(d->fd);
}
- if (d->nr >= 0) {
+ if (d->nr >= 0 && !d->relinquished) {
_cleanup_close_ int control = -1;
control = open("/dev/loop-control", O_RDWR|O_CLOEXEC|O_NOCTTY|O_NONBLOCK);
@@ -155,3 +155,12 @@ LoopDevice* loop_device_unref(LoopDevice *d) {
return NULL;
}
+
+void loop_device_relinquish(LoopDevice *d) {
+ assert(d);
+
+ /* Don't attempt to clean up the loop device anymore from this point on. Leave the clean-ing up to the kernel
+ * itself, using the loop device "auto-clear" logic we already turned on when creating the device. */
+
+ d->relinquished = true;
+}
diff --git a/src/shared/loop-util.h b/src/shared/loop-util.h
index 5c847c4ac3..45fead5f18 100644
--- a/src/shared/loop-util.h
+++ b/src/shared/loop-util.h
@@ -29,11 +29,13 @@ struct LoopDevice {
int fd;
int nr;
char *node;
+ bool relinquished;
};
int loop_device_make(int fd, int open_flags, LoopDevice **ret);
int loop_device_make_by_path(const char *path, int open_flags, LoopDevice **ret);
LoopDevice* loop_device_unref(LoopDevice *d);
-
DEFINE_TRIVIAL_CLEANUP_FUNC(LoopDevice*, loop_device_unref);
+
+void loop_device_relinquish(LoopDevice *d);
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