Colin Walters
09238da065
I'm trying to improve the developer experience on OSTree-managed systems, and I had an epiphany the other day - there's no reason we have to be absolutely against mutating the current rootfs live. The key should be making it easy to rollback/reset to a known good state. I see this command as useful for two related but distinct workflows: - `ostree admin unlock` will assume you're doing "development". The semantics hare are that we mount an overlayfs on `/usr`, but the overlay data is in `/var/tmp`, and is thus discarded on reboot. - `ostree admin unlock --hotfix` first clones your current deployment, then creates an overlayfs over `/usr` persistent to this deployment. Persistent in that now the initramfs switchroot tool knows how to mount it as well. In this model, if you want to discard the hotfix, at the moment you roll back/reboot into the clone. Note originally, I tried using `rofiles-fuse` over `/usr` for this, but then everything immediately explodes because the default (at least CentOS 7) SELinux policy denies tons of things (including `sshd_t` access to `fusefs_t`). Sigh. So the switch to `overlayfs` came after experimentation. It still seems to have some issues...specifically `unix_chkpwd` is broken, possibly because it's setuid? Basically I can't ssh in anymore. But I *can* `rpm -Uvh strace.rpm` which is handy. NOTE: I haven't tested the hotfix path fully yet, specifically the initramfs bits.
121 lines
4.3 KiB
C
121 lines
4.3 KiB
C
/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*-
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*
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* Copyright (C) 2012,2013 Colin Walters <walters@verbum.org>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but 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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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#pragma once
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#include "libglnx.h"
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#include "ostree.h"
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#include "ostree-kernel-args.h"
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#include "ostree-bootloader.h"
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G_BEGIN_DECLS
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typedef enum {
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/* Don't flag deployments as immutable. */
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OSTREE_SYSROOT_DEBUG_MUTABLE_DEPLOYMENTS = 1 << 0
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} OstreeSysrootDebugFlags;
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struct OstreeSysroot {
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GObject parent;
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GFile *path;
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int sysroot_fd;
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GLnxLockFile lock;
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gboolean loaded;
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OstreeSePolicy *sepolicy;
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GPtrArray *deployments;
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int bootversion;
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int subbootversion;
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OstreeDeployment *booted_deployment;
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struct timespec loaded_ts;
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/* Only access through ostree_sysroot_get_repo() */
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OstreeRepo *repo;
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OstreeSysrootDebugFlags debug_flags;
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};
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#define OSTREE_SYSROOT_LOCKFILE "ostree/lock"
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/* We keep some transient state in /run */
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#define _OSTREE_SYSROOT_DEPLOYMENT_RUNSTATE_DIR "/run/ostree/deployment-state/"
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#define _OSTREE_SYSROOT_DEPLOYMENT_RUNSTATE_FLAG_DEVELOPMENT "unlocked-development"
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gboolean
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_ostree_sysroot_read_boot_loader_configs (OstreeSysroot *self,
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int bootversion,
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GPtrArray **out_loader_configs,
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GCancellable *cancellable,
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GError **error);
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gboolean
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_ostree_sysroot_read_current_subbootversion (OstreeSysroot *self,
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int bootversion,
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int *out_subbootversion,
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GCancellable *cancellable,
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GError **error);
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gboolean
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_ostree_sysroot_parse_deploy_path_name (const char *name,
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char **out_csum,
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int *out_serial,
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GError **error);
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gboolean
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_ostree_sysroot_list_deployment_dirs_for_os (GFile *osdir,
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GPtrArray *inout_deployments,
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GCancellable *cancellable,
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GError **error);
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char *
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_ostree_sysroot_get_origin_relpath (GFile *path,
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guint32 *out_device,
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guint64 *out_inode,
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GCancellable *cancellable,
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GError **error);
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char *_ostree_sysroot_join_lines (GPtrArray *lines);
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gboolean _ostree_sysroot_query_bootloader (OstreeSysroot *sysroot,
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OstreeBootloader **out_bootloader,
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GCancellable *cancellable,
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GError **error);
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gboolean _ostree_sysroot_bump_mtime (OstreeSysroot *sysroot,
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GError **error);
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typedef enum {
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OSTREE_SYSROOT_CLEANUP_BOOTVERSIONS = 1 << 0,
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OSTREE_SYSROOT_CLEANUP_DEPLOYMENTS = 1 << 1,
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OSTREE_SYSROOT_CLEANUP_PRUNE_REPO = 1 << 2,
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OSTREE_SYSROOT_CLEANUP_ALL = 0xffff
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} OstreeSysrootCleanupFlags;
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gboolean _ostree_sysroot_piecemeal_cleanup (OstreeSysroot *sysroot,
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OstreeSysrootCleanupFlags flags,
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GCancellable *cancellable,
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GError **error);
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G_END_DECLS
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