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sysusers: add support for a --image= switch

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This commit is contained in:
Lennart Poettering 2020-07-28 18:32:07 +02:00
parent 63d3d0a50b
commit 0c3ee12737
1 changed files with 37 additions and 1 deletions
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38
src/sysusers/sysusers.c
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@ -7,17 +7,19 @@
#include "conf-files.h"
#include "copy.h"
#include "def.h"
#include "dissect-image.h"
#include "fd-util.h"
#include "fileio.h"
#include "format-util.h"
#include "fs-util.h"
#include "hashmap.h"
#include "main-func.h"
#include "mount-util.h"
#include "pager.h"
#include "path-util.h"
#include "pretty-print.h"
#include "set.h"
#include "selinux-util.h"
#include "set.h"
#include "smack-util.h"
#include "specifier.h"
#include "string-util.h"
@ -63,6 +65,7 @@ typedef struct Item {
} Item;
static char *arg_root = NULL;
static char *arg_image = NULL;
static bool arg_cat_config = false;
static const char *arg_replace = NULL;
static bool arg_inline = false;
@ -93,6 +96,7 @@ STATIC_DESTRUCTOR_REGISTER(database_by_groupname, hashmap_freep);
STATIC_DESTRUCTOR_REGISTER(database_groups, set_free_freep);
STATIC_DESTRUCTOR_REGISTER(uid_range, freep);
STATIC_DESTRUCTOR_REGISTER(arg_root, freep);
STATIC_DESTRUCTOR_REGISTER(arg_image, freep);
static int errno_is_not_exists(int code) {
/* See getpwnam(3) and getgrnam(3): those codes and others can be returned if the user or group are
@ -1739,6 +1743,7 @@ static int help(void) {
" --version Show package version\n"
" --cat-config Show configuration files\n"
" --root=PATH Operate on an alternate filesystem root\n"
" --image=PATH Operate on disk image as filesystem root\n"
" --replace=PATH Treat arguments as replacement for PATH\n"
" --inline Treat arguments as configuration lines\n"
" --no-pager Do not pipe output into a pager\n"
@ -1756,6 +1761,7 @@ static int parse_argv(int argc, char *argv[]) {
ARG_VERSION = 0x100,
ARG_CAT_CONFIG,
ARG_ROOT,
ARG_IMAGE,
ARG_REPLACE,
ARG_INLINE,
ARG_NO_PAGER,
@ -1766,6 +1772,7 @@ static int parse_argv(int argc, char *argv[]) {
{ "version", no_argument, NULL, ARG_VERSION },
{ "cat-config", no_argument, NULL, ARG_CAT_CONFIG },
{ "root", required_argument, NULL, ARG_ROOT },
{ "image", required_argument, NULL, ARG_IMAGE },
{ "replace", required_argument, NULL, ARG_REPLACE },
{ "inline", no_argument, NULL, ARG_INLINE },
{ "no-pager", no_argument, NULL, ARG_NO_PAGER },
@ -1797,6 +1804,12 @@ static int parse_argv(int argc, char *argv[]) {
return r;
break;
case ARG_IMAGE:
r = parse_path_argument_and_warn(optarg, /* suppress_root= */ false, &arg_image);
if (r < 0)
return r;
break;
case ARG_REPLACE:
if (!path_is_absolute(optarg) ||
!endswith(optarg, ".conf"))
@ -1829,6 +1842,9 @@ static int parse_argv(int argc, char *argv[]) {
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"When --replace= is given, some configuration items must be specified");
if (arg_image && arg_root)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Please specify either --root= or --image=, the combination of both is not supported.");
return 1;
}
@ -1880,6 +1896,9 @@ static int read_config_files(char **args) {
}
static int run(int argc, char *argv[]) {
_cleanup_(loop_device_unrefp) LoopDevice *loop_device = NULL;
_cleanup_(decrypted_image_unrefp) DecryptedImage *decrypted_image = NULL;
_cleanup_(umount_and_rmdir_and_freep) char *unlink_dir = NULL;
_cleanup_close_ int lock = -1;
Iterator iterator;
Item *i;
@ -1900,6 +1919,23 @@ static int run(int argc, char *argv[]) {
if (r < 0)
return r;
if (arg_image) {
assert(!arg_root);
r = mount_image_privately_interactively(
arg_image,
DISSECT_IMAGE_REQUIRE_ROOT|DISSECT_IMAGE_VALIDATE_OS|DISSECT_IMAGE_RELAX_VAR_CHECK|DISSECT_IMAGE_FSCK,
&unlink_dir,
&loop_device,
&decrypted_image);
if (r < 0)
return r;
arg_root = strdup(unlink_dir);
if (!arg_root)
return log_oom();
}
/* If command line arguments are specified along with --replace, read all
* configuration files and insert the positional arguments at the specified
* place. Otherwise, if command line arguments are specified, execute just