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nspawn: use automatic cleanup and provide debug info

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The documentation for --link-journal is also reworded.
This commit is contained in:
Zbigniew Jędrzejewski-Szmek
2012-10-02 14:56:26 +02:00
parent b2e6df73aa
commit 27407a01c6
3 changed files with 72 additions and 89 deletions
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man/systemd-nspawn.xml
+17 -18
View File
@@ -248,31 +248,30 @@
<literal>host</literal>,
<literal>guest</literal>,
<literal>auto</literal>. If
<literal>no</literal> the journal is
not linked. If <literal>host</literal>
<literal>no</literal>, the journal is
not linked. If <literal>host</literal>,
the journal files are stored on the
host file system (beneath the host's
<filename>/var/log/journal</filename>)
and a per-machine subdirectory of this
directory is created and bind mounted
host file system (beneath
<filename>/var/log/journal/&lt;machine-id&gt;</filename>)
and the subdirectory is bind-mounted
into the container at the same
location. If <literal>guest</literal>
location. If <literal>guest</literal>,
the journal files are stored on the
guest file system (beneath the guest's
<filename>/var/log/journal</filename>)
and a per-machine subdirectory of this
directory is symlinked into the host
guest file system (beneath
<filename>/var/log/journal/&lt;machine-id&gt;</filename>)
and the subdirectory is symlinked into the host
at the same location. If
<literal>auto</literal> (the default)
and the subdirectory of
<literal>auto</literal> (the default),
and the right subdirectory of
<filename>/var/log/journal</filename>
exists as directory it is bind mounted
into the container, but nothing is
done otherwise. Effectively, booting a
container once with
exists, it will be bind mounted
into the container. If the
subdirectory doesn't exist, no
linking is performed. Effectively,
booting a container once with
<literal>guest</literal> or
<literal>host</literal> will link the
journal persistently if further one
journal persistently if further on
the default of <literal>auto</literal>
is used.</para></listitem>
</varlistentry>
src/nspawn/nspawn.c
+55 -70
View File
@@ -668,58 +668,58 @@ static int setup_hostname(void) {
static int setup_journal(const char *directory) {
sd_id128_t machine_id;
char *p = NULL, *b = NULL, *l, *q = NULL, *d = NULL;
char _cleanup_free_ *p = NULL, *b = NULL, *q = NULL, *d = NULL;
char *id;
int r;
if (arg_link_journal == LINK_NO)
return 0;
p = strappend(directory, "/etc/machine-id");
if (!p) {
r = log_oom();
goto finish;
}
if (!p)
return log_oom();
r = read_one_line_file(p, &b);
if (r == -ENOENT && arg_link_journal == LINK_AUTO) {
r = 0;
goto finish;
} else if (r < 0) {
log_error("Failed to read machine ID: %s", strerror(-r));
if (r == -ENOENT && arg_link_journal == LINK_AUTO)
return 0;
else if (r < 0) {
log_error("Failed to read machine ID from %s: %s", p, strerror(-r));
return r;
}
l = strstrip(b);
if (isempty(l) && arg_link_journal == LINK_AUTO) {
r = 0;
goto finish;
}
id = strstrip(b);
if (isempty(id) && arg_link_journal == LINK_AUTO)
return 0;
/* Verify validaty */
r = sd_id128_from_string(l, &machine_id);
/* Verify validity */
r = sd_id128_from_string(id, &machine_id);
if (r < 0) {
log_error("Failed to parse machine ID: %s", strerror(-r));
goto finish;
log_error("Failed to parse machine ID from %s: %s", p, strerror(-r));
return r;
}
free(p);
p = strappend("/var/log/journal/", l);
q = strjoin(directory, "/var/log/journal/", l, NULL);
if (!p || !q) {
r = log_oom();
goto finish;
}
p = strappend("/var/log/journal/", id);
q = strjoin(directory, "/var/log/journal/", id, NULL);
if (!p || !q)
return log_oom();
if (path_is_mount_point(p, false) > 0 ||
path_is_mount_point(q, false) > 0) {
if (path_is_mount_point(p, false) > 0) {
if (arg_link_journal != LINK_AUTO) {
log_error("Journal already a mount point, refusing.");
r = -EEXIST;
goto finish;
log_error("%s: already a mount point, refusing to use for journal", p);
return -EEXIST;
}
r = 0;
goto finish;
return 0;
}
if (path_is_mount_point(q, false) > 0) {
if (arg_link_journal != LINK_AUTO) {
log_error("%s: already a mount point, refusing to use for journal", q);
return -EEXIST;
}
return 0;
}
r = readlink_and_make_absolute(p, &d);
@@ -728,89 +728,74 @@ static int setup_journal(const char *directory) {
arg_link_journal == LINK_AUTO) &&
path_equal(d, q)) {
mkdir_p(q, 0755);
r = 0;
goto finish;
r = mkdir_p(q, 0755);
if (r < 0)
log_warning("failed to create directory %s: %m", q);
return 0;
}
if (unlink(p) < 0) {
log_error("Failed to remove symlink %s: %m", p);
r = -errno;
goto finish;
return -errno;
}
} else if (r == -EINVAL) {
if (arg_link_journal == LINK_GUEST &&
rmdir(p) < 0) {
if (errno == ENOTDIR)
log_error("%s already exists and is neither symlink nor directory.", p);
else {
if (errno == ENOTDIR) {
log_error("%s already exists and is neither a symlink nor a directory", p);
return r;
} else {
log_error("Failed to remove %s: %m", p);
r = -errno;
return -errno;
}
goto finish;
}
} else if (r != -ENOENT) {
log_error("readlink(%s) failed: %m", p);
goto finish;
return r;
}
if (arg_link_journal == LINK_GUEST) {
if (symlink(q, p) < 0) {
log_error("Failed to symlink %s to %s: %m", q, p);
r = -errno;
goto finish;
return -errno;
}
mkdir_p(q, 0755);
r = 0;
goto finish;
r = mkdir_p(q, 0755);
if (r < 0)
log_warning("failed to create directory %s: %m", q);
return 0;
}
if (arg_link_journal == LINK_HOST) {
r = mkdir_p(p, 0755);
if (r < 0) {
log_error("Failed to create %s: %m", p);
goto finish;
return r;
}
} else if (access(p, F_OK) < 0) {
r = 0;
goto finish;
}
} else if (access(p, F_OK) < 0)
return 0;
if (dir_is_empty(q) == 0) {
log_error("%s not empty.", q);
r = -ENOTEMPTY;
goto finish;
return -ENOTEMPTY;
}
r = mkdir_p(q, 0755);
if (r < 0) {
log_error("Failed to create %s: %m", q);
goto finish;
return r;
}
if (mount(p, q, "bind", MS_BIND, NULL) < 0) {
log_error("Failed to bind mount journal from host into guest: %m");
r = -errno;
goto finish;
return -errno;
}
r = 0;
finish:
free(p);
free(q);
free(d);
free(b);
return r;
return 0;
}
static int drop_capabilities(void) {
src/shared/mkdir.c
-1
View File
@@ -29,7 +29,6 @@
#include "mkdir.h"
#include "label.h"
#include "util.h"
#include "log.h"
int mkdir_label(const char *path, mode_t mode) {
return label_mkdir(path, mode, true);