[people/ms/pakfire.git] / src / libpakfire / mount.c

/*#############################################################################
#                                                                             #
# Pakfire - The IPFire package management system                              #
# Copyright (C) 2022 Pakfire development team                                 #
#                                                                             #
# This program is free software: you can redistribute it and/or modify        #
# it under the terms of the GNU General Public License as published by        #
# the Free Software Foundation, either version 3 of the License, or           #
# (at your option) any later version.                                         #
#                                                                             #
# This program 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 General Public License for more details.                                #
#                                                                             #
# You should have received a copy of the GNU General Public License           #
# along with this program.  If not, see <http://www.gnu.org/licenses/>.       #
#                                                                             #
#############################################################################*/

#include <errno.h>
#include <linux/limits.h>
#include <stddef.h>
#include <sys/mount.h>
#include <sys/stat.h>
#include <sys/sysmacros.h>
#include <sys/types.h>

// libmount
#include <libmount/libmount.h>

#include <pakfire/arch.h>
#include <pakfire/logging.h>
#include <pakfire/pakfire.h>
#include <pakfire/mount.h>
#include <pakfire/string.h>
#include <pakfire/util.h>

static const struct pakfire_mountpoint {
	const char* source;
	const char* target;
	const char* fstype;
	int flags;
	const char* options;
} mountpoints[] = {
	// Mount a new instance of /proc
	{ "pakfire_proc",        "proc",               "proc",
		MS_NOSUID|MS_NOEXEC|MS_NODEV, NULL, },

	// Make /proc/sys read-only (except /proc/sys/net)
	{ "/proc/sys",           "proc/sys",           "bind",   MS_BIND|MS_REC, NULL, },
	{ "/proc/sys/net",       "proc/sys/net",       "bind",   MS_BIND|MS_REC, NULL, },
	{ "/proc/sys",           "proc/sys",           "bind",
		MS_BIND|MS_RDONLY|MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_REMOUNT, NULL, },

	// Deny write access to /proc/sysrq-trigger (can be used to restart the host)
	{ "/proc/sysrq-trigger", "proc/sysrq-trigger", "bind",   MS_BIND|MS_REC, NULL, },
	{ "/proc/sysrq-trigger", "proc/sysrq-trigger", "bind",
		MS_BIND|MS_RDONLY|MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_REMOUNT, NULL, },

	// Make /proc/irq read-only
	{ "/proc/irq",           "proc/irq",           "bind",   MS_BIND|MS_REC, NULL, },
	{ "/proc/irq",           "proc/irq",           "bind",
		MS_BIND|MS_RDONLY|MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_REMOUNT, NULL, },

	// Make /proc/bus read-only
	{ "/proc/bus",           "proc/bus",           "bind",   MS_BIND|MS_REC, NULL, },
	{ "/proc/bus",           "proc/bus",           "bind",
		MS_BIND|MS_RDONLY|MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_REMOUNT, NULL, },

	// Bind-Mount /sys ready-only
	{ "/sys",                "sys",                "bind",   MS_BIND|MS_REC, NULL, },
	{ "/sys",                "sys",                "bind",
		MS_BIND|MS_RDONLY|MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_REMOUNT, NULL, },

	// Create a new /dev
	{ "pakfire_dev",         "dev",                "tmpfs",  MS_NOSUID|MS_NOEXEC,
		"mode=0755,size=4m,nr_inodes=64k", },
	{ "pakfire_dev_pts",     "dev/pts",            "devpts", MS_NOSUID|MS_NOEXEC,
		"newinstance,ptmxmode=0666,mode=620", },

	// Create a new /dev/shm
	{ "pakfire_dev_shm",     "dev/shm",            "tmpfs",
		MS_NOSUID|MS_NODEV|MS_STRICTATIME, "mode=1777,size=1024m", },

	// Mount /dev/mqueue
	{ "mqueue",               "dev/mqueue",        "mqueue",
		MS_NOSUID|MS_NOEXEC|MS_NODEV, NULL },

	// Create a new /run
	{ "pakfire_run",          "run",               "tmpfs",  MS_NOSUID|MS_NOEXEC|MS_NODEV,
		"mode=755,size=256m,nr_inodes=1k", },

	// Create a new /tmp
	{ "pakfire_tmp",          "tmp",               "tmpfs",
		MS_NOSUID|MS_NODEV|MS_STRICTATIME, "mode=1777,size=4096m", },

	// The end
	{ NULL },
};

static const struct pakfire_devnode {
	const char* path;
	int major;
	int minor;
	mode_t mode;
	int flags;
} devnodes[] = {
	{ "/dev/null",      1,  3, S_IFCHR|S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH, 0 },
	{ "/dev/zero",      1,  5, S_IFCHR|S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH, 0 },
	{ "/dev/full",      1,  7, S_IFCHR|S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH, 0 },
	{ "/dev/random",    1,  8, S_IFCHR|S_IRUSR|S_IRGRP|S_IROTH, 0 },
	{ "/dev/urandom",   1,  9, S_IFCHR|S_IRUSR|S_IRGRP|S_IROTH, 0 },
	{ "/dev/kmsg",      1, 11, S_IFCHR|S_IRUSR|S_IRGRP|S_IROTH, 0 },
	{ "/dev/tty",       5,  0, S_IFCHR|S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH, 0 },
	{ "/dev/console",   5,  1, S_IFCHR|S_IRUSR|S_IWUSR, 0 },
	{ "/dev/rtc0",    252,  0, S_IFCHR|S_IRUSR|S_IWUSR, 0 },

	// Loop Devices
	{ "/dev/loop-control", 10, 237, S_IFCHR|S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP, PAKFIRE_MOUNT_LOOP_DEVICES },
	{ "/dev/loop0",         7,   0, S_IFCHR|S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP, PAKFIRE_MOUNT_LOOP_DEVICES },
	{ "/dev/loop1",         7,   1, S_IFCHR|S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP, PAKFIRE_MOUNT_LOOP_DEVICES },
	{ "/dev/loop2",         7,   2, S_IFCHR|S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP, PAKFIRE_MOUNT_LOOP_DEVICES },
	{ "/dev/loop3",         7,   3, S_IFCHR|S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP, PAKFIRE_MOUNT_LOOP_DEVICES },
	{ "/dev/loop4",         7,   4, S_IFCHR|S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP, PAKFIRE_MOUNT_LOOP_DEVICES },
	{ "/dev/loop5",         7,   5, S_IFCHR|S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP, PAKFIRE_MOUNT_LOOP_DEVICES },
	{ "/dev/loop6",         7,   6, S_IFCHR|S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP, PAKFIRE_MOUNT_LOOP_DEVICES },
	{ "/dev/loop7",         7,   7, S_IFCHR|S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP, PAKFIRE_MOUNT_LOOP_DEVICES },

	{ NULL },
};

static const struct pakfire_symlink {
	const char* target;
	const char* path;
} symlinks[] = {
	{ "/dev/pts/ptmx",   "/dev/ptmx", },
	{ "/proc/self/fd",   "/dev/fd", },
	{ "/proc/self/fd/0", "/dev/stdin" },
	{ "/proc/self/fd/1", "/dev/stdout" },
	{ "/proc/self/fd/2", "/dev/stderr" },
	{ "/proc/kcore",     "/dev/core" },
	{ NULL },
};

static int pakfire_mount_is_mountpoint(struct pakfire* pakfire, const char* path) {
	// XXX THIS STILL NEEDS TO BE IMPLEMENTED
	return 1;
}

int pakfire_mount_make_mounpoint(struct pakfire* pakfire, const char* path) {
	int r;

	// Check if path already is a mountpoint
	r = pakfire_mount_is_mountpoint(pakfire, path);
	switch (r) {
		// Already is a mountpoint
		case 0:
			return 0;

		// Is not a mountpoint
		case 1:
			break;

		default:
			ERROR(pakfire, "Could not determine whether %s is a mountpoint: %m\n", path);
			return r;
	}

	// Bind-mount to self
	r = mount(path, path, NULL, MS_BIND|MS_REC, NULL);
	if (r) {
		ERROR(pakfire, "Could not make %s a mountpoint: %m\n", path);
		return r;
	}

	return 0;
}

/*
	Easy way to iterate through all mountpoints
*/
static int pakfire_mount_foreach(struct pakfire* pakfire, int direction,
		int (*callback)(struct pakfire* pakfire, struct libmnt_fs* fs, const void* data),
		const void* data) {
	const char* root = pakfire_get_path(pakfire);
	int r = 0;

	struct libmnt_iter* iterator = NULL;
	struct libmnt_table* tab = NULL;
	struct libmnt_fs* fs = NULL;

	// Create an iterator
	iterator = mnt_new_iter(direction);
	if (!iterator) {
		ERROR(pakfire, "Could not setup iterator: %m\n");
		goto ERROR;
	}

	// Read /proc/mounts
	tab = mnt_new_table_from_file("/proc/mounts");
	if (!tab) {
		ERROR(pakfire, "Could not open /proc/mounts: %m\n");
		goto ERROR;
	}

	while (mnt_table_next_fs(tab, iterator, &fs) == 0) {
		const char* target = mnt_fs_get_target(fs);

		// Ignore any mointpoints that don't belong to us
		if (!pakfire_string_startswith(target, root))
			continue;

		// Call the callback for each relevant mountpoint
		r = callback(pakfire, fs, data);
		if (r)
			break;
	}

ERROR:
	// Tidy up
	if (fs)
		mnt_unref_fs(fs);
	if (tab)
		mnt_unref_table(tab);
	if (iterator)
		mnt_free_iter(iterator);

	return r;
}

static int __pakfire_is_mountpoint(struct pakfire* pakfire,
		struct libmnt_fs* fs, const void* data) {
	const char* path = (const char*)data;

	return mnt_fs_streq_target(fs, path);
}

int pakfire_is_mountpoint(struct pakfire* pakfire, const char* path) {
	return pakfire_mount_foreach(pakfire, MNT_ITER_FORWARD,
		__pakfire_is_mountpoint, path);
}

static int pakfire_mount(struct pakfire* pakfire, const char* source, const char* target,
		const char* fstype, unsigned long mflags, const void* data) {
	const char* options = (const char*)data;

	// Check for some basic inputs
	if (!source || !target) {
		errno = EINVAL;
		return 1;
	}

	DEBUG(pakfire, "Mounting %s from %s (%s - %s)\n", target, source, fstype, options);

	// Perform mount()
	int r = mount(source, target, fstype, mflags, data);
	if (r) {
		ERROR(pakfire, "Could not mount %s: %m\n", target);
	}

	return r;
}

static int __pakfire_mount_print(struct pakfire* pakfire,
		struct libmnt_fs* fs, const void* data) {
	DEBUG(pakfire,
		"  %s %s %s %s\n",
		mnt_fs_get_source(fs),
		mnt_fs_get_target(fs),
		mnt_fs_get_fstype(fs),
		mnt_fs_get_fs_options(fs)
	);

	return 0;
}

int pakfire_mount_list(struct pakfire* pakfire) {
	DEBUG(pakfire, "Mountpoints:\n");

	return pakfire_mount_foreach(pakfire, MNT_ITER_FORWARD,
		__pakfire_mount_print, NULL);
}

static int pakfire_populate_dev(struct pakfire* pakfire, int flags) {
	char path[PATH_MAX];

	// Create device nodes
	for (const struct pakfire_devnode* devnode = devnodes; devnode->path; devnode++) {
		DEBUG(pakfire, "Creating device node %s\n", devnode->path);

		// Check if flags match
		if (devnode->flags && !(flags & devnode->flags))
			continue;

		int r = pakfire_path(pakfire, path, "%s", devnode->path);
		if (r)
			return r;

		dev_t dev = makedev(devnode->major, devnode->minor);

		r = mknod(path, devnode->mode, dev);

		// Continue if mknod was successful
		if (r == 0)
			continue;

		// If we could not create the device node because of permission issues,
		// it might be likely that we are running in a user namespace where creating
		// device nodes is not permitted. Try bind-mounting them.
		if (errno == EPERM)
			goto MOUNT;

		// Otherwise log an error and end
		ERROR(pakfire, "Could not create %s: %m\n", devnode->path);
		return r;

MOUNT:
		// Create an empty file
		r = pakfire_touch(path, 0444);
		if (r) {
			ERROR(pakfire, "Could not create %s: %m\n", path);
			return r;
		}

		// Create a bind-mount over the file
		r = pakfire_mount(pakfire, devnode->path, path, "bind", MS_BIND, NULL);
		if (r)
			return r;
	}

	// Create symlinks
	for (const struct pakfire_symlink* s = symlinks; s->target; s++) {
		DEBUG(pakfire, "Creating symlink %s -> %s\n", s->path, s->target);

		int r = pakfire_path(pakfire, path, "%s", s->path);
		if (r)
			return r;

		r = symlink(s->target, path);
		if (r) {
			ERROR(pakfire, "Could not create symlink %s: %m\n", s->path);
			return r;
		}
	}

	return 0;
}

static int pakfire_mount_interpreter(struct pakfire* pakfire) {
	char target[PATH_MAX];

	// Fetch the target architecture
	const char* arch = pakfire_get_arch(pakfire);

	// Can we emulate this architecture?
	char* interpreter = pakfire_arch_find_interpreter(arch);

	// No interpreter required
	if (!interpreter)
		return 0;

	DEBUG(pakfire, "Mounting interpreter %s for %s\n", interpreter, arch);

	// Where to mount this?
	int r = pakfire_path(pakfire, target, "%s", interpreter);
	if (r)
		return r;

	// Create directory
	r = pakfire_mkparentdir(target, 0755);
	if (r)
		return r;

	// Create an empty file
	FILE* f = fopen(target, "w");
	if (!f)
		return 1;
	fclose(f);

	r = pakfire_mount(pakfire, interpreter, target, NULL, MS_BIND|MS_RDONLY, NULL);
	if (r)
		ERROR(pakfire, "Could not mount interpreter %s to %s: %m\n", interpreter, target);

	return r;
}

int pakfire_mount_all(struct pakfire* pakfire, int flags) {
	char target[PATH_MAX];
	int r;

	// Fetch Pakfire's root directory
	const char* root = pakfire_get_path(pakfire);

	for (const struct pakfire_mountpoint* mp = mountpoints; mp->source; mp++) {
		// Figure out where to mount
		r = pakfire_path_join(target, root, mp->target);
		if (r)
			return r;

		// Create target if it doesn't exist
		if (!pakfire_path_exists(target)) {
			r = pakfire_mkdir(target, 0755);
			if (r) {
				ERROR(pakfire, "Could not create %s: %m\n", target);
				return r;
			}
		}

		// Perform mount()
		r = pakfire_mount(pakfire, mp->source, target, mp->fstype, mp->flags, mp->options);
		if (r)
			return r;
	}

	// Populate /dev
	r = pakfire_populate_dev(pakfire, flags);
	if (r)
		return r;

	// Mount the interpreter (if needed)
	r = pakfire_mount_interpreter(pakfire);
	if (r)
		return r;

	return 0;
}

int pakfire_bind(struct pakfire* pakfire, const char* src, const char* dst, int flags) {
	struct stat st;
	char mountpoint[PATH_MAX];

	if (!dst)
		dst = src;

	int r = pakfire_path(pakfire, mountpoint, "%s", dst);
	if (r)
		return r;

	DEBUG(pakfire, "Bind-mounting %s to %s\n", src, mountpoint);

	r = stat(src, &st);
	if (r < 0) {
		ERROR(pakfire, "Could not stat %s: %m\n", src);
		return 1;
	}

	// Make sure the mountpoint exists
	switch (st.st_mode & S_IFMT) {
		case S_IFDIR:
			r = pakfire_mkdir(mountpoint, st.st_mode);
			if (r && errno != EEXIST)
				return r;
			break;

		case S_IFREG:
		case S_IFLNK:
			// Make parent directory
			r = pakfire_mkparentdir(mountpoint, 0755);
			if (r)
				return r;

			// Create a file
			FILE* f = fopen(mountpoint, "w");
			if (!f)
				return 1;
			fclose(f);
			break;

		default:
			errno = ENOTSUP;
			return 1;
	}

	// The Linux kernel seems to be quite funny when trying to bind-mount something
	// as read-only and requires us to mount the source first, and then remount it
	// again using MS_RDONLY.
	if (flags & MS_RDONLY) {
		r = pakfire_mount(pakfire, src, mountpoint, NULL, MS_BIND|MS_REC, NULL);
		if (r)
			return r;

		// Add the remount flag
		flags |= MS_REMOUNT;
	}

	// Perform mount
	return pakfire_mount(pakfire, src, mountpoint, NULL, flags|MS_BIND|MS_REC, NULL);
}
Commit	Line	Data
bf5f9c24 MT	1	/*#############################################################################
	2	# #
	3	# Pakfire - The IPFire package management system #
	4	# Copyright (C) 2022 Pakfire development team #
	5	# #
	6	# This program is free software: you can redistribute it and/or modify #
	7	# it under the terms of the GNU General Public License as published by #
	8	# the Free Software Foundation, either version 3 of the License, or #
	9	# (at your option) any later version. #
	10	# #
	11	# This program is distributed in the hope that it will be useful, #
	12	# but WITHOUT ANY WARRANTY; without even the implied warranty of #
	13	# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the #
	14	# GNU General Public License for more details. #
	15	# #
	16	# You should have received a copy of the GNU General Public License #
	17	# along with this program. If not, see <http://www.gnu.org/licenses/>. #
	18	# #
	19	#############################################################################*/
	20
	21	#include <errno.h>
	22	#include <linux/limits.h>
bf5f9c24 MT	23	#include <stddef.h>
	24	#include <sys/mount.h>
	25	#include <sys/stat.h>
f71c82d8	26	#include <sys/sysmacros.h>
bf5f9c24 MT	27	#include <sys/types.h>
	28
	29	// libmount
	30	#include <libmount/libmount.h>
	31
660120b6	32	#include <pakfire/arch.h>
bf5f9c24 MT	33	#include <pakfire/logging.h>
	34	#include <pakfire/pakfire.h>
	35	#include <pakfire/mount.h>
d973a13d	36	#include <pakfire/string.h>
bf5f9c24 MT	37	#include <pakfire/util.h>
	38
	39	static const struct pakfire_mountpoint {
	40	const char* source;
	41	const char* target;
	42	const char* fstype;
	43	int flags;
	44	const char* options;
bf5f9c24	45	} mountpoints[] = {
9ab7dd21 MT	46	// Mount a new instance of /proc
	47	{ "pakfire_proc", "proc", "proc",
	48	MS_NOSUID\|MS_NOEXEC\|MS_NODEV, NULL, },
bf5f9c24	49
9ab7dd21	50	// Make /proc/sys read-only (except /proc/sys/net)
cc752ada MT	51	{ "/proc/sys", "proc/sys", "bind", MS_BIND\|MS_REC, NULL, },
cc752ada MT	52	{ "/proc/sys/net", "proc/sys/net", "bind", MS_BIND\|MS_REC, NULL, },
9ab7dd21 MT	53	{ "/proc/sys", "proc/sys", "bind",
9ab7dd21 MT	54	MS_BIND\|MS_RDONLY\|MS_NOSUID\|MS_NOEXEC\|MS_NODEV\|MS_REMOUNT, NULL, },
bf5f9c24	55
9ab7dd21	56	// Deny write access to /proc/sysrq-trigger (can be used to restart the host)
cc752ada	57	{ "/proc/sysrq-trigger", "proc/sysrq-trigger", "bind", MS_BIND\|MS_REC, NULL, },
9ab7dd21 MT	58	{ "/proc/sysrq-trigger", "proc/sysrq-trigger", "bind",
	59	MS_BIND\|MS_RDONLY\|MS_NOSUID\|MS_NOEXEC\|MS_NODEV\|MS_REMOUNT, NULL, },
	60
	61	// Make /proc/irq read-only
cc752ada	62	{ "/proc/irq", "proc/irq", "bind", MS_BIND\|MS_REC, NULL, },
9ab7dd21 MT	63	{ "/proc/irq", "proc/irq", "bind",
	64	MS_BIND\|MS_RDONLY\|MS_NOSUID\|MS_NOEXEC\|MS_NODEV\|MS_REMOUNT, NULL, },
	65
	66	// Make /proc/bus read-only
cc752ada	67	{ "/proc/bus", "proc/bus", "bind", MS_BIND\|MS_REC, NULL, },
9ab7dd21 MT	68	{ "/proc/bus", "proc/bus", "bind",
	69	MS_BIND\|MS_RDONLY\|MS_NOSUID\|MS_NOEXEC\|MS_NODEV\|MS_REMOUNT, NULL, },
	70
	71	// Bind-Mount /sys ready-only
cc752ada	72	{ "/sys", "sys", "bind", MS_BIND\|MS_REC, NULL, },
9ab7dd21 MT	73	{ "/sys", "sys", "bind",
9ab7dd21 MT	74	MS_BIND\|MS_RDONLY\|MS_NOSUID\|MS_NOEXEC\|MS_NODEV\|MS_REMOUNT, NULL, },
bf5f9c24 MT	75
bf5f9c24 MT	76	// Create a new /dev
cc752ada	77	{ "pakfire_dev", "dev", "tmpfs", MS_NOSUID\|MS_NOEXEC,
9ab7dd21	78	"mode=0755,size=4m,nr_inodes=64k", },
0675c514 MT	79	{ "pakfire_dev_pts", "dev/pts", "devpts", MS_NOSUID\|MS_NOEXEC,
0675c514 MT	80	"newinstance,ptmxmode=0666,mode=620", },
cc752ada	81
99affb62 MT	82	// Create a new /dev/shm
	83	{ "pakfire_dev_shm", "dev/shm", "tmpfs",
	84	MS_NOSUID\|MS_NODEV\|MS_STRICTATIME, "mode=1777,size=1024m", },
	85
cc752ada MT	86	// Mount /dev/mqueue
	87	{ "mqueue", "dev/mqueue", "mqueue",
	88	MS_NOSUID\|MS_NOEXEC\|MS_NODEV, NULL },
bf5f9c24 MT	89
bf5f9c24 MT	90	// Create a new /run
b1a6d98c MT	91	{ "pakfire_run", "run", "tmpfs", MS_NOSUID\|MS_NOEXEC\|MS_NODEV,
	92	"mode=755,size=256m,nr_inodes=1k", },
	93
	94	// Create a new /tmp
	95	{ "pakfire_tmp", "tmp", "tmpfs",
84e5948e	96	MS_NOSUID\|MS_NODEV\|MS_STRICTATIME, "mode=1777,size=4096m", },
bf5f9c24	97
bf5f9c24 MT	98	// The end
	99	{ NULL },
	100	};
	101
f71c82d8 MT	102	static const struct pakfire_devnode {
	103	const char* path;
	104	int major;
	105	int minor;
	106	mode_t mode;
282b732a	107	int flags;
f71c82d8	108	} devnodes[] = {
282b732a MT	109	{ "/dev/null", 1, 3, S_IFCHR\|S_IRUSR\|S_IWUSR\|S_IRGRP\|S_IWGRP\|S_IROTH\|S_IWOTH, 0 },
	110	{ "/dev/zero", 1, 5, S_IFCHR\|S_IRUSR\|S_IWUSR\|S_IRGRP\|S_IWGRP\|S_IROTH\|S_IWOTH, 0 },
	111	{ "/dev/full", 1, 7, S_IFCHR\|S_IRUSR\|S_IWUSR\|S_IRGRP\|S_IWGRP\|S_IROTH\|S_IWOTH, 0 },
	112	{ "/dev/random", 1, 8, S_IFCHR\|S_IRUSR\|S_IRGRP\|S_IROTH, 0 },
	113	{ "/dev/urandom", 1, 9, S_IFCHR\|S_IRUSR\|S_IRGRP\|S_IROTH, 0 },
	114	{ "/dev/kmsg", 1, 11, S_IFCHR\|S_IRUSR\|S_IRGRP\|S_IROTH, 0 },
	115	{ "/dev/tty", 5, 0, S_IFCHR\|S_IRUSR\|S_IWUSR\|S_IRGRP\|S_IWGRP\|S_IROTH\|S_IWOTH, 0 },
	116	{ "/dev/console", 5, 1, S_IFCHR\|S_IRUSR\|S_IWUSR, 0 },
	117	{ "/dev/rtc0", 252, 0, S_IFCHR\|S_IRUSR\|S_IWUSR, 0 },
	118
	119	// Loop Devices
	120	{ "/dev/loop-control", 10, 237, S_IFCHR\|S_IRUSR\|S_IWUSR\|S_IRGRP\|S_IWGRP, PAKFIRE_MOUNT_LOOP_DEVICES },
	121	{ "/dev/loop0", 7, 0, S_IFCHR\|S_IRUSR\|S_IWUSR\|S_IRGRP\|S_IWGRP, PAKFIRE_MOUNT_LOOP_DEVICES },
	122	{ "/dev/loop1", 7, 1, S_IFCHR\|S_IRUSR\|S_IWUSR\|S_IRGRP\|S_IWGRP, PAKFIRE_MOUNT_LOOP_DEVICES },
	123	{ "/dev/loop2", 7, 2, S_IFCHR\|S_IRUSR\|S_IWUSR\|S_IRGRP\|S_IWGRP, PAKFIRE_MOUNT_LOOP_DEVICES },
	124	{ "/dev/loop3", 7, 3, S_IFCHR\|S_IRUSR\|S_IWUSR\|S_IRGRP\|S_IWGRP, PAKFIRE_MOUNT_LOOP_DEVICES },
	125	{ "/dev/loop4", 7, 4, S_IFCHR\|S_IRUSR\|S_IWUSR\|S_IRGRP\|S_IWGRP, PAKFIRE_MOUNT_LOOP_DEVICES },
	126	{ "/dev/loop5", 7, 5, S_IFCHR\|S_IRUSR\|S_IWUSR\|S_IRGRP\|S_IWGRP, PAKFIRE_MOUNT_LOOP_DEVICES },
	127	{ "/dev/loop6", 7, 6, S_IFCHR\|S_IRUSR\|S_IWUSR\|S_IRGRP\|S_IWGRP, PAKFIRE_MOUNT_LOOP_DEVICES },
	128	{ "/dev/loop7", 7, 7, S_IFCHR\|S_IRUSR\|S_IWUSR\|S_IRGRP\|S_IWGRP, PAKFIRE_MOUNT_LOOP_DEVICES },
	129
f71c82d8 MT	130	{ NULL },
f71c82d8 MT	131	};
dc01afb6	132
f71c82d8 MT	133	static const struct pakfire_symlink {
	134	const char* target;
	135	const char* path;
	136	} symlinks[] = {
0675c514	137	{ "/dev/pts/ptmx", "/dev/ptmx", },
f71c82d8 MT	138	{ "/proc/self/fd", "/dev/fd", },
	139	{ "/proc/self/fd/0", "/dev/stdin" },
	140	{ "/proc/self/fd/1", "/dev/stdout" },
	141	{ "/proc/self/fd/2", "/dev/stderr" },
	142	{ "/proc/kcore", "/dev/core" },
	143	{ NULL },
	144	};
dc01afb6	145
14df7388 MT	146	static int pakfire_mount_is_mountpoint(struct pakfire* pakfire, const char* path) {
	147	// XXX THIS STILL NEEDS TO BE IMPLEMENTED
	148	return 1;
	149	}
	150
	151	int pakfire_mount_make_mounpoint(struct pakfire* pakfire, const char* path) {
	152	int r;
	153
	154	// Check if path already is a mountpoint
	155	r = pakfire_mount_is_mountpoint(pakfire, path);
	156	switch (r) {
	157	// Already is a mountpoint
	158	case 0:
	159	return 0;
	160
	161	// Is not a mountpoint
	162	case 1:
	163	break;
	164
	165	default:
	166	ERROR(pakfire, "Could not determine whether %s is a mountpoint: %m\n", path);
	167	return r;
	168	}
	169
	170	// Bind-mount to self
	171	r = mount(path, path, NULL, MS_BIND\|MS_REC, NULL);
	172	if (r) {
	173	ERROR(pakfire, "Could not make %s a mountpoint: %m\n", path);
	174	return r;
	175	}
	176
	177	return 0;
	178	}
	179
bf5f9c24 MT	180	/*
	181	Easy way to iterate through all mountpoints
	182	*/
0ea82518 MT	183	static int pakfire_mount_foreach(struct pakfire* pakfire, int direction,
0ea82518 MT	184	int (callback)(struct pakfire pakfire, struct libmnt_fs* fs, const void* data),
f71c82d8	185	const void* data) {
bf5f9c24	186	const char* root = pakfire_get_path(pakfire);
ec64a612	187	int r = 0;
bf5f9c24	188
0ea82518 MT	189	struct libmnt_iter* iterator = NULL;
	190	struct libmnt_table* tab = NULL;
	191	struct libmnt_fs* fs = NULL;
	192
	193	// Create an iterator
	194	iterator = mnt_new_iter(direction);
	195	if (!iterator) {
	196	ERROR(pakfire, "Could not setup iterator: %m\n");
	197	goto ERROR;
	198	}
	199
	200	// Read /proc/mounts
	201	tab = mnt_new_table_from_file("/proc/mounts");
	202	if (!tab) {
bf5f9c24	203	ERROR(pakfire, "Could not open /proc/mounts: %m\n");
0ea82518	204	goto ERROR;
bf5f9c24 MT	205	}
bf5f9c24 MT	206
0ea82518 MT	207	while (mnt_table_next_fs(tab, iterator, &fs) == 0) {
0ea82518 MT	208	const char* target = mnt_fs_get_target(fs);
bf5f9c24 MT	209
bf5f9c24 MT	210	// Ignore any mointpoints that don't belong to us
0ea82518	211	if (!pakfire_string_startswith(target, root))
bf5f9c24 MT	212	continue;
bf5f9c24 MT	213
bf5f9c24	214	// Call the callback for each relevant mountpoint
0ea82518	215	r = callback(pakfire, fs, data);
bf5f9c24 MT	216	if (r)
	217	break;
	218	}
	219
0ea82518	220	ERROR:
bf5f9c24	221	// Tidy up
0ea82518 MT	222	if (fs)
	223	mnt_unref_fs(fs);
	224	if (tab)
	225	mnt_unref_table(tab);
	226	if (iterator)
	227	mnt_free_iter(iterator);
bf5f9c24 MT	228
	229	return r;
	230	}
	231
	232	static int __pakfire_is_mountpoint(struct pakfire* pakfire,
0ea82518	233	struct libmnt_fs* fs, const void* data) {
bf5f9c24 MT	234	const char* path = (const char*)data;
bf5f9c24 MT	235
0ea82518	236	return mnt_fs_streq_target(fs, path);
bf5f9c24 MT	237	}
	238
	239	int pakfire_is_mountpoint(struct pakfire* pakfire, const char* path) {
0ea82518	240	return pakfire_mount_foreach(pakfire, MNT_ITER_FORWARD,
f71c82d8	241	__pakfire_is_mountpoint, path);
bf5f9c24 MT	242	}
bf5f9c24 MT	243
163851bc	244	static int pakfire_mount(struct pakfire* pakfire, const char* source, const char* target,
bf5f9c24 MT	245	const char* fstype, unsigned long mflags, const void* data) {
bf5f9c24 MT	246	const char* options = (const char*)data;
bf5f9c24 MT	247
	248	// Check for some basic inputs
	249	if (!source \|\| !target) {
	250	errno = EINVAL;
	251	return 1;
	252	}
	253
7f970e6e	254	DEBUG(pakfire, "Mounting %s from %s (%s - %s)\n", target, source, fstype, options);
bf5f9c24	255
7f970e6e MT	256	// Perform mount()
7f970e6e MT	257	int r = mount(source, target, fstype, mflags, data);
bf5f9c24	258	if (r) {
7f970e6e	259	ERROR(pakfire, "Could not mount %s: %m\n", target);
bf5f9c24 MT	260	}
bf5f9c24 MT	261
bf5f9c24 MT	262	return r;
	263	}
	264
bf5f9c24	265	static int __pakfire_mount_print(struct pakfire* pakfire,
0ea82518 MT	266	struct libmnt_fs* fs, const void* data) {
	267	DEBUG(pakfire,
	268	" %s %s %s %s\n",
	269	mnt_fs_get_source(fs),
	270	mnt_fs_get_target(fs),
	271	mnt_fs_get_fstype(fs),
	272	mnt_fs_get_fs_options(fs)
bf5f9c24 MT	273	);
	274
	275	return 0;
	276	}
	277
91247a7b MT	278	int pakfire_mount_list(struct pakfire* pakfire) {
91247a7b MT	279	DEBUG(pakfire, "Mountpoints:\n");
bf5f9c24	280
0ea82518	281	return pakfire_mount_foreach(pakfire, MNT_ITER_FORWARD,
f71c82d8 MT	282	__pakfire_mount_print, NULL);
	283	}
	284
282b732a	285	static int pakfire_populate_dev(struct pakfire* pakfire, int flags) {
f71c82d8 MT	286	char path[PATH_MAX];
	287
	288	// Create device nodes
	289	for (const struct pakfire_devnode* devnode = devnodes; devnode->path; devnode++) {
	290	DEBUG(pakfire, "Creating device node %s\n", devnode->path);
	291
282b732a MT	292	// Check if flags match
	293	if (devnode->flags && !(flags & devnode->flags))
	294	continue;
	295
77e26129 MT	296	int r = pakfire_path(pakfire, path, "%s", devnode->path);
	297	if (r)
	298	return r;
f71c82d8 MT	299
	300	dev_t dev = makedev(devnode->major, devnode->minor);
	301
	302	r = mknod(path, devnode->mode, dev);
8f1003a3 MT	303
	304	// Continue if mknod was successful
	305	if (r == 0)
	306	continue;
	307
	308	// If we could not create the device node because of permission issues,
	309	// it might be likely that we are running in a user namespace where creating
	310	// device nodes is not permitted. Try bind-mounting them.
	311	if (errno == EPERM)
	312	goto MOUNT;
	313
	314	// Otherwise log an error and end
	315	ERROR(pakfire, "Could not create %s: %m\n", devnode->path);
	316	return r;
	317
	318	MOUNT:
	319	// Create an empty file
	320	r = pakfire_touch(path, 0444);
f71c82d8	321	if (r) {
8f1003a3	322	ERROR(pakfire, "Could not create %s: %m\n", path);
f71c82d8 MT	323	return r;
f71c82d8 MT	324	}
8f1003a3 MT	325
8f1003a3 MT	326	// Create a bind-mount over the file
64e3b4ff	327	r = pakfire_mount(pakfire, devnode->path, path, "bind", MS_BIND, NULL);
8f1003a3 MT	328	if (r)
8f1003a3 MT	329	return r;
f71c82d8 MT	330	}
	331
	332	// Create symlinks
	333	for (const struct pakfire_symlink* s = symlinks; s->target; s++) {
	334	DEBUG(pakfire, "Creating symlink %s -> %s\n", s->path, s->target);
	335
77e26129 MT	336	int r = pakfire_path(pakfire, path, "%s", s->path);
	337	if (r)
	338	return r;
f71c82d8 MT	339
	340	r = symlink(s->target, path);
	341	if (r) {
	342	ERROR(pakfire, "Could not create symlink %s: %m\n", s->path);
	343	return r;
	344	}
	345	}
	346
	347	return 0;
bf5f9c24 MT	348	}
bf5f9c24 MT	349
660120b6 MT	350	static int pakfire_mount_interpreter(struct pakfire* pakfire) {
	351	char target[PATH_MAX];
	352
	353	// Fetch the target architecture
	354	const char* arch = pakfire_get_arch(pakfire);
	355
	356	// Can we emulate this architecture?
	357	char* interpreter = pakfire_arch_find_interpreter(arch);
	358
	359	// No interpreter required
	360	if (!interpreter)
	361	return 0;
	362
	363	DEBUG(pakfire, "Mounting interpreter %s for %s\n", interpreter, arch);
	364
	365	// Where to mount this?
77e26129 MT	366	int r = pakfire_path(pakfire, target, "%s", interpreter);
77e26129 MT	367	if (r)
660120b6 MT	368	return r;
	369
	370	// Create directory
520ce66c	371	r = pakfire_mkparentdir(target, 0755);
660120b6 MT	372	if (r)
	373	return r;
	374
	375	// Create an empty file
	376	FILE* f = fopen(target, "w");
	377	if (!f)
	378	return 1;
	379	fclose(f);
	380
	381	r = pakfire_mount(pakfire, interpreter, target, NULL, MS_BIND\|MS_RDONLY, NULL);
	382	if (r)
	383	ERROR(pakfire, "Could not mount interpreter %s to %s: %m\n", interpreter, target);
	384
	385	return r;
	386	}
	387
282b732a	388	int pakfire_mount_all(struct pakfire* pakfire, int flags) {
bf5f9c24	389	char target[PATH_MAX];
bf5f9c24 MT	390	int r;
	391
	392	// Fetch Pakfire's root directory
	393	const char* root = pakfire_get_path(pakfire);
	394
bf5f9c24	395	for (const struct pakfire_mountpoint* mp = mountpoints; mp->source; mp++) {
bf5f9c24 MT	396	// Figure out where to mount
bf5f9c24 MT	397	r = pakfire_path_join(target, root, mp->target);
56796f84	398	if (r)
bf5f9c24 MT	399	return r;
bf5f9c24 MT	400
a685a503 MT	401	// Create target if it doesn't exist
	402	if (!pakfire_path_exists(target)) {
	403	r = pakfire_mkdir(target, 0755);
	404	if (r) {
	405	ERROR(pakfire, "Could not create %s: %m\n", target);
	406	return r;
	407	}
	408	}
bf5f9c24	409
bf5f9c24	410	// Perform mount()
f71c82d8	411	r = pakfire_mount(pakfire, mp->source, target, mp->fstype, mp->flags, mp->options);
a685a503	412	if (r)
bf5f9c24	413	return r;
bf5f9c24 MT	414	}
bf5f9c24 MT	415
f71c82d8	416	// Populate /dev
282b732a	417	r = pakfire_populate_dev(pakfire, flags);
f71c82d8 MT	418	if (r)
	419	return r;
	420
660120b6 MT	421	// Mount the interpreter (if needed)
	422	r = pakfire_mount_interpreter(pakfire);
	423	if (r)
	424	return r;
	425
bf5f9c24 MT	426	return 0;
	427	}
	428
061223f7	429	int pakfire_bind(struct pakfire* pakfire, const char* src, const char* dst, int flags) {
163851bc MT	430	struct stat st;
	431	char mountpoint[PATH_MAX];
	432
	433	if (!dst)
	434	dst = src;
	435
77e26129 MT	436	int r = pakfire_path(pakfire, mountpoint, "%s", dst);
	437	if (r)
	438	return r;
163851bc MT	439
	440	DEBUG(pakfire, "Bind-mounting %s to %s\n", src, mountpoint);
	441
	442	r = stat(src, &st);
	443	if (r < 0) {
	444	ERROR(pakfire, "Could not stat %s: %m\n", src);
	445	return 1;
	446	}
	447
	448	// Make sure the mountpoint exists
	449	switch (st.st_mode & S_IFMT) {
	450	case S_IFDIR:
520ce66c	451	r = pakfire_mkdir(mountpoint, st.st_mode);
163851bc MT	452	if (r && errno != EEXIST)
	453	return r;
	454	break;
	455
	456	case S_IFREG:
	457	case S_IFLNK:
	458	// Make parent directory
520ce66c	459	r = pakfire_mkparentdir(mountpoint, 0755);
163851bc MT	460	if (r)
	461	return r;
	462
	463	// Create a file
	464	FILE* f = fopen(mountpoint, "w");
	465	if (!f)
	466	return 1;
	467	fclose(f);
	468	break;
	469
	470	default:
	471	errno = ENOTSUP;
	472	return 1;
	473	}
	474
976fbbc8 MT	475	// The Linux kernel seems to be quite funny when trying to bind-mount something
	476	// as read-only and requires us to mount the source first, and then remount it
	477	// again using MS_RDONLY.
	478	if (flags & MS_RDONLY) {
	479	r = pakfire_mount(pakfire, src, mountpoint, NULL, MS_BIND\|MS_REC, NULL);
	480	if (r)
	481	return r;
	482
	483	// Add the remount flag
	484	flags \|= MS_REMOUNT;
	485	}
	486
163851bc	487	// Perform mount
976fbbc8	488	return pakfire_mount(pakfire, src, mountpoint, NULL, flags\|MS_BIND\|MS_REC, NULL);
163851bc	489	}