2d3a5a73e0
In -U mode we might need to re-chown() all files and directories to match the UID shift we want for the image. That's problematic on fat partitions, such as the ESP (and which is generated by mkosi's --bootable switch), because fat of course knows no UID/GID file ownership natively. With this change we take benefit of the uid= and gid= mount options FAT knows: instead of chown()ing all files and directories we can just specify the right UID/GID to use at mount time. This beefs up the image dissection logic in two ways: 1. First of all support for mounting relevant file systems with uid=/gid= is added: when a UID is specified during mount it is used for all applicable file systems. 2. Secondly, two new mount flags are added: DISSECT_IMAGE_MOUNT_ROOT_ONLY and DISSECT_IMAGE_MOUNT_NON_ROOT_ONLY. If one is specified the mount routine will either only mount the root partition of an image, or all partitions except the root partition. This is used by nspawn: first the root partition is mounted, so that we can determine the UID shift in use so far, based on ownership of the image's root directory. Then, we mount the remaining partitions in a second go, this time with the right UID/GID information.
70 lines
2.3 KiB
C
70 lines
2.3 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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#pragma once
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/***
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <fcntl.h>
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#include <mntent.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include "macro.h"
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#include "missing.h"
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int name_to_handle_at_loop(int fd, const char *path, struct file_handle **ret_handle, int *ret_mnt_id, int flags);
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int path_get_mnt_id(const char *path, int *ret);
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int fd_is_mount_point(int fd, const char *filename, int flags);
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int path_is_mount_point(const char *path, const char *root, int flags);
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int repeat_unmount(const char *path, int flags);
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int umount_recursive(const char *target, int flags);
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int bind_remount_recursive(const char *prefix, bool ro, char **blacklist);
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int bind_remount_recursive_with_mountinfo(const char *prefix, bool ro, char **blacklist, FILE *proc_self_mountinfo);
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int mount_move_root(const char *path);
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DEFINE_TRIVIAL_CLEANUP_FUNC(FILE*, endmntent);
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#define _cleanup_endmntent_ _cleanup_(endmntentp)
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bool fstype_is_network(const char *fstype);
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bool fstype_is_api_vfs(const char *fstype);
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bool fstype_is_ro(const char *fsype);
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bool fstype_can_discard(const char *fstype);
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bool fstype_can_uid_gid(const char *fstype);
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const char* mode_to_inaccessible_node(mode_t mode);
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int mount_verbose(
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int error_log_level,
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const char *what,
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const char *where,
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const char *type,
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unsigned long flags,
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const char *options);
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int umount_verbose(const char *where);
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const char *mount_propagation_flags_to_string(unsigned long flags);
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int mount_propagation_flags_from_string(const char *name, unsigned long *ret);
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