[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/parse.h>
#include <pakfire/path.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 },
};

int pakfire_mount_change_propagation(struct pakfire_ctx* ctx, const char* path, int propagation) {
	CTX_DEBUG(ctx, "Changing mount propagation on %s\n", path);

	int r = mount(NULL, path, NULL, propagation|MS_REC, NULL);
	if (r)
		CTX_ERROR(ctx, "Failed to change mount propagation on %s: %m\n", path);

	return r;
}

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_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;
}

static int __pakfire_mount_list(char* line, size_t length, void* data) {
	struct pakfire_ctx* ctx = data;

	// Send the line to the logger
	CTX_DEBUG(ctx, "  %.*s", (int)length, line);

	return 0;
}

int pakfire_mount_list(struct pakfire_ctx* ctx) {
	CTX_DEBUG(ctx, "Mountpoints:\n");

	return pakfire_parse_file("/proc/self/mounts", __pakfire_mount_list, ctx);
}

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_effective_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_append(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_make_ramdisk(struct pakfire* pakfire, char* path, const char* args) {
	int r;

	// Create a new temporary directory
	char* p = pakfire_mkdtemp(path);
	if (!p)
		return -errno;

	// Mount the ramdisk
	r = pakfire_mount(pakfire, "pakfire_ramdisk", p, "tmpfs", 0, args);
	if (r) {
		ERROR_ERRNO(pakfire, r, "Could not mount ramdisk at %s (%s): %m\n", p, args);
		return r;
	}

	DEBUG(pakfire, "Ramdisk mounted at %s (%s)\n", p, args);

	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, "bind", MS_BIND|MS_REC, NULL);
		if (r)
			return r;

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

	// Perform mount
	return pakfire_mount(pakfire, src, mountpoint, "bind", 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>
bf5f9c24 MT	34	#include <pakfire/pakfire.h>
bc0b24a7	35	#include <pakfire/parse.h>
729827f7	36	#include <pakfire/path.h>
bf5f9c24	37	#include <pakfire/mount.h>
d973a13d	38	#include <pakfire/string.h>
bf5f9c24 MT	39	#include <pakfire/util.h>
	40
	41	static const struct pakfire_mountpoint {
	42	const char* source;
	43	const char* target;
	44	const char* fstype;
	45	int flags;
	46	const char* options;
bf5f9c24	47	} mountpoints[] = {
9ab7dd21 MT	48	// Mount a new instance of /proc
	49	{ "pakfire_proc", "proc", "proc",
	50	MS_NOSUID\|MS_NOEXEC\|MS_NODEV, NULL, },
bf5f9c24	51
9ab7dd21	52	// Make /proc/sys read-only (except /proc/sys/net)
cc752ada MT	53	{ "/proc/sys", "proc/sys", "bind", MS_BIND\|MS_REC, NULL, },
cc752ada MT	54	{ "/proc/sys/net", "proc/sys/net", "bind", MS_BIND\|MS_REC, NULL, },
9ab7dd21 MT	55	{ "/proc/sys", "proc/sys", "bind",
9ab7dd21 MT	56	MS_BIND\|MS_RDONLY\|MS_NOSUID\|MS_NOEXEC\|MS_NODEV\|MS_REMOUNT, NULL, },
bf5f9c24	57
9ab7dd21	58	// Deny write access to /proc/sysrq-trigger (can be used to restart the host)
cc752ada	59	{ "/proc/sysrq-trigger", "proc/sysrq-trigger", "bind", MS_BIND\|MS_REC, NULL, },
9ab7dd21 MT	60	{ "/proc/sysrq-trigger", "proc/sysrq-trigger", "bind",
	61	MS_BIND\|MS_RDONLY\|MS_NOSUID\|MS_NOEXEC\|MS_NODEV\|MS_REMOUNT, NULL, },
	62
	63	// Make /proc/irq read-only
cc752ada	64	{ "/proc/irq", "proc/irq", "bind", MS_BIND\|MS_REC, NULL, },
9ab7dd21 MT	65	{ "/proc/irq", "proc/irq", "bind",
	66	MS_BIND\|MS_RDONLY\|MS_NOSUID\|MS_NOEXEC\|MS_NODEV\|MS_REMOUNT, NULL, },
	67
	68	// Make /proc/bus read-only
cc752ada	69	{ "/proc/bus", "proc/bus", "bind", MS_BIND\|MS_REC, NULL, },
9ab7dd21 MT	70	{ "/proc/bus", "proc/bus", "bind",
	71	MS_BIND\|MS_RDONLY\|MS_NOSUID\|MS_NOEXEC\|MS_NODEV\|MS_REMOUNT, NULL, },
	72
	73	// Bind-Mount /sys ready-only
cc752ada	74	{ "/sys", "sys", "bind", MS_BIND\|MS_REC, NULL, },
9ab7dd21 MT	75	{ "/sys", "sys", "bind",
9ab7dd21 MT	76	MS_BIND\|MS_RDONLY\|MS_NOSUID\|MS_NOEXEC\|MS_NODEV\|MS_REMOUNT, NULL, },
bf5f9c24 MT	77
bf5f9c24 MT	78	// Create a new /dev
cc752ada	79	{ "pakfire_dev", "dev", "tmpfs", MS_NOSUID\|MS_NOEXEC,
9ab7dd21	80	"mode=0755,size=4m,nr_inodes=64k", },
0675c514 MT	81	{ "pakfire_dev_pts", "dev/pts", "devpts", MS_NOSUID\|MS_NOEXEC,
0675c514 MT	82	"newinstance,ptmxmode=0666,mode=620", },
cc752ada	83
99affb62 MT	84	// Create a new /dev/shm
	85	{ "pakfire_dev_shm", "dev/shm", "tmpfs",
	86	MS_NOSUID\|MS_NODEV\|MS_STRICTATIME, "mode=1777,size=1024m", },
	87
cc752ada MT	88	// Mount /dev/mqueue
	89	{ "mqueue", "dev/mqueue", "mqueue",
	90	MS_NOSUID\|MS_NOEXEC\|MS_NODEV, NULL },
bf5f9c24 MT	91
bf5f9c24 MT	92	// Create a new /run
b1a6d98c MT	93	{ "pakfire_run", "run", "tmpfs", MS_NOSUID\|MS_NOEXEC\|MS_NODEV,
	94	"mode=755,size=256m,nr_inodes=1k", },
	95
	96	// Create a new /tmp
	97	{ "pakfire_tmp", "tmp", "tmpfs",
84e5948e	98	MS_NOSUID\|MS_NODEV\|MS_STRICTATIME, "mode=1777,size=4096m", },
bf5f9c24	99
bf5f9c24 MT	100	// The end
	101	{ NULL },
	102	};
	103
f71c82d8 MT	104	static const struct pakfire_devnode {
	105	const char* path;
	106	int major;
	107	int minor;
	108	mode_t mode;
282b732a	109	int flags;
f71c82d8	110	} devnodes[] = {
282b732a MT	111	{ "/dev/null", 1, 3, S_IFCHR\|S_IRUSR\|S_IWUSR\|S_IRGRP\|S_IWGRP\|S_IROTH\|S_IWOTH, 0 },
	112	{ "/dev/zero", 1, 5, S_IFCHR\|S_IRUSR\|S_IWUSR\|S_IRGRP\|S_IWGRP\|S_IROTH\|S_IWOTH, 0 },
	113	{ "/dev/full", 1, 7, S_IFCHR\|S_IRUSR\|S_IWUSR\|S_IRGRP\|S_IWGRP\|S_IROTH\|S_IWOTH, 0 },
	114	{ "/dev/random", 1, 8, S_IFCHR\|S_IRUSR\|S_IRGRP\|S_IROTH, 0 },
	115	{ "/dev/urandom", 1, 9, S_IFCHR\|S_IRUSR\|S_IRGRP\|S_IROTH, 0 },
	116	{ "/dev/kmsg", 1, 11, S_IFCHR\|S_IRUSR\|S_IRGRP\|S_IROTH, 0 },
	117	{ "/dev/tty", 5, 0, S_IFCHR\|S_IRUSR\|S_IWUSR\|S_IRGRP\|S_IWGRP\|S_IROTH\|S_IWOTH, 0 },
	118	{ "/dev/console", 5, 1, S_IFCHR\|S_IRUSR\|S_IWUSR, 0 },
	119	{ "/dev/rtc0", 252, 0, S_IFCHR\|S_IRUSR\|S_IWUSR, 0 },
	120
	121	// Loop Devices
	122	{ "/dev/loop-control", 10, 237, S_IFCHR\|S_IRUSR\|S_IWUSR\|S_IRGRP\|S_IWGRP, PAKFIRE_MOUNT_LOOP_DEVICES },
	123	{ "/dev/loop0", 7, 0, S_IFCHR\|S_IRUSR\|S_IWUSR\|S_IRGRP\|S_IWGRP, PAKFIRE_MOUNT_LOOP_DEVICES },
	124	{ "/dev/loop1", 7, 1, S_IFCHR\|S_IRUSR\|S_IWUSR\|S_IRGRP\|S_IWGRP, PAKFIRE_MOUNT_LOOP_DEVICES },
	125	{ "/dev/loop2", 7, 2, S_IFCHR\|S_IRUSR\|S_IWUSR\|S_IRGRP\|S_IWGRP, PAKFIRE_MOUNT_LOOP_DEVICES },
	126	{ "/dev/loop3", 7, 3, S_IFCHR\|S_IRUSR\|S_IWUSR\|S_IRGRP\|S_IWGRP, PAKFIRE_MOUNT_LOOP_DEVICES },
	127	{ "/dev/loop4", 7, 4, S_IFCHR\|S_IRUSR\|S_IWUSR\|S_IRGRP\|S_IWGRP, PAKFIRE_MOUNT_LOOP_DEVICES },
	128	{ "/dev/loop5", 7, 5, S_IFCHR\|S_IRUSR\|S_IWUSR\|S_IRGRP\|S_IWGRP, PAKFIRE_MOUNT_LOOP_DEVICES },
	129	{ "/dev/loop6", 7, 6, S_IFCHR\|S_IRUSR\|S_IWUSR\|S_IRGRP\|S_IWGRP, PAKFIRE_MOUNT_LOOP_DEVICES },
	130	{ "/dev/loop7", 7, 7, S_IFCHR\|S_IRUSR\|S_IWUSR\|S_IRGRP\|S_IWGRP, PAKFIRE_MOUNT_LOOP_DEVICES },
	131
f71c82d8 MT	132	{ NULL },
f71c82d8 MT	133	};
dc01afb6	134
f71c82d8 MT	135	static const struct pakfire_symlink {
	136	const char* target;
	137	const char* path;
	138	} symlinks[] = {
0675c514	139	{ "/dev/pts/ptmx", "/dev/ptmx", },
f71c82d8 MT	140	{ "/proc/self/fd", "/dev/fd", },
	141	{ "/proc/self/fd/0", "/dev/stdin" },
	142	{ "/proc/self/fd/1", "/dev/stdout" },
	143	{ "/proc/self/fd/2", "/dev/stderr" },
	144	{ "/proc/kcore", "/dev/core" },
	145	{ NULL },
	146	};
dc01afb6	147
719e2e3e MT	148	int pakfire_mount_change_propagation(struct pakfire_ctx* ctx, const char* path, int propagation) {
719e2e3e MT	149	CTX_DEBUG(ctx, "Changing mount propagation on %s\n", path);
9f558f7d MT	150
	151	int r = mount(NULL, path, NULL, propagation\|MS_REC, NULL);
	152	if (r)
719e2e3e	153	CTX_ERROR(ctx, "Failed to change mount propagation on %s: %m\n", path);
9f558f7d MT	154
	155	return r;
	156	}
	157
14df7388 MT	158	static int pakfire_mount_is_mountpoint(struct pakfire* pakfire, const char* path) {
	159	// XXX THIS STILL NEEDS TO BE IMPLEMENTED
	160	return 1;
	161	}
	162
	163	int pakfire_mount_make_mounpoint(struct pakfire* pakfire, const char* path) {
	164	int r;
	165
	166	// Check if path already is a mountpoint
	167	r = pakfire_mount_is_mountpoint(pakfire, path);
	168	switch (r) {
	169	// Already is a mountpoint
	170	case 0:
	171	return 0;
	172
	173	// Is not a mountpoint
	174	case 1:
	175	break;
	176
	177	default:
	178	ERROR(pakfire, "Could not determine whether %s is a mountpoint: %m\n", path);
	179	return r;
	180	}
	181
	182	// Bind-mount to self
	183	r = mount(path, path, NULL, MS_BIND\|MS_REC, NULL);
	184	if (r) {
	185	ERROR(pakfire, "Could not make %s a mountpoint: %m\n", path);
	186	return r;
	187	}
	188
	189	return 0;
	190	}
	191
bf5f9c24 MT	192	/*
	193	Easy way to iterate through all mountpoints
	194	*/
0ea82518 MT	195	static int pakfire_mount_foreach(struct pakfire* pakfire, int direction,
0ea82518 MT	196	int (callback)(struct pakfire pakfire, struct libmnt_fs* fs, const void* data),
f71c82d8	197	const void* data) {
bf5f9c24	198	const char* root = pakfire_get_path(pakfire);
ec64a612	199	int r = 0;
bf5f9c24	200
0ea82518 MT	201	struct libmnt_iter* iterator = NULL;
	202	struct libmnt_table* tab = NULL;
	203	struct libmnt_fs* fs = NULL;
	204
	205	// Create an iterator
	206	iterator = mnt_new_iter(direction);
	207	if (!iterator) {
	208	ERROR(pakfire, "Could not setup iterator: %m\n");
	209	goto ERROR;
	210	}
	211
	212	// Read /proc/mounts
	213	tab = mnt_new_table_from_file("/proc/mounts");
	214	if (!tab) {
bf5f9c24	215	ERROR(pakfire, "Could not open /proc/mounts: %m\n");
0ea82518	216	goto ERROR;
bf5f9c24 MT	217	}
bf5f9c24 MT	218
0ea82518 MT	219	while (mnt_table_next_fs(tab, iterator, &fs) == 0) {
0ea82518 MT	220	const char* target = mnt_fs_get_target(fs);
bf5f9c24 MT	221
bf5f9c24 MT	222	// Ignore any mointpoints that don't belong to us
0ea82518	223	if (!pakfire_string_startswith(target, root))
bf5f9c24 MT	224	continue;
bf5f9c24 MT	225
bf5f9c24	226	// Call the callback for each relevant mountpoint
0ea82518	227	r = callback(pakfire, fs, data);
bf5f9c24 MT	228	if (r)
	229	break;
	230	}
	231
0ea82518	232	ERROR:
bf5f9c24	233	// Tidy up
0ea82518 MT	234	if (fs)
	235	mnt_unref_fs(fs);
	236	if (tab)
	237	mnt_unref_table(tab);
	238	if (iterator)
	239	mnt_free_iter(iterator);
bf5f9c24 MT	240
	241	return r;
	242	}
	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
bc0b24a7 MT	278	static int __pakfire_mount_list(char* line, size_t length, void* data) {
bc0b24a7 MT	279	struct pakfire_ctx* ctx = data;
bf5f9c24	280
bc0b24a7 MT	281	// Send the line to the logger
	282	CTX_DEBUG(ctx, " %.*s", (int)length, line);
	283
	284	return 0;
	285	}
	286
	287	int pakfire_mount_list(struct pakfire_ctx* ctx) {
	288	CTX_DEBUG(ctx, "Mountpoints:\n");
	289
	290	return pakfire_parse_file("/proc/self/mounts", __pakfire_mount_list, ctx);
f71c82d8 MT	291	}
f71c82d8 MT	292
282b732a	293	static int pakfire_populate_dev(struct pakfire* pakfire, int flags) {
f71c82d8 MT	294	char path[PATH_MAX];
	295
	296	// Create device nodes
	297	for (const struct pakfire_devnode* devnode = devnodes; devnode->path; devnode++) {
	298	DEBUG(pakfire, "Creating device node %s\n", devnode->path);
	299
282b732a MT	300	// Check if flags match
	301	if (devnode->flags && !(flags & devnode->flags))
	302	continue;
	303
77e26129 MT	304	int r = pakfire_path(pakfire, path, "%s", devnode->path);
	305	if (r)
	306	return r;
f71c82d8 MT	307
	308	dev_t dev = makedev(devnode->major, devnode->minor);
	309
	310	r = mknod(path, devnode->mode, dev);
8f1003a3 MT	311
	312	// Continue if mknod was successful
	313	if (r == 0)
	314	continue;
	315
	316	// If we could not create the device node because of permission issues,
	317	// it might be likely that we are running in a user namespace where creating
	318	// device nodes is not permitted. Try bind-mounting them.
	319	if (errno == EPERM)
	320	goto MOUNT;
	321
	322	// Otherwise log an error and end
	323	ERROR(pakfire, "Could not create %s: %m\n", devnode->path);
	324	return r;
	325
	326	MOUNT:
	327	// Create an empty file
	328	r = pakfire_touch(path, 0444);
f71c82d8	329	if (r) {
8f1003a3	330	ERROR(pakfire, "Could not create %s: %m\n", path);
f71c82d8 MT	331	return r;
f71c82d8 MT	332	}
8f1003a3 MT	333
8f1003a3 MT	334	// Create a bind-mount over the file
64e3b4ff	335	r = pakfire_mount(pakfire, devnode->path, path, "bind", MS_BIND, NULL);
8f1003a3 MT	336	if (r)
8f1003a3 MT	337	return r;
f71c82d8 MT	338	}
	339
	340	// Create symlinks
	341	for (const struct pakfire_symlink* s = symlinks; s->target; s++) {
	342	DEBUG(pakfire, "Creating symlink %s -> %s\n", s->path, s->target);
	343
77e26129 MT	344	int r = pakfire_path(pakfire, path, "%s", s->path);
	345	if (r)
	346	return r;
f71c82d8 MT	347
	348	r = symlink(s->target, path);
	349	if (r) {
	350	ERROR(pakfire, "Could not create symlink %s: %m\n", s->path);
	351	return r;
	352	}
	353	}
	354
	355	return 0;
bf5f9c24 MT	356	}
bf5f9c24 MT	357
660120b6 MT	358	static int pakfire_mount_interpreter(struct pakfire* pakfire) {
	359	char target[PATH_MAX];
	360
	361	// Fetch the target architecture
652f2a99	362	const char* arch = pakfire_get_effective_arch(pakfire);
660120b6 MT	363
	364	// Can we emulate this architecture?
	365	char* interpreter = pakfire_arch_find_interpreter(arch);
	366
	367	// No interpreter required
	368	if (!interpreter)
	369	return 0;
	370
	371	DEBUG(pakfire, "Mounting interpreter %s for %s\n", interpreter, arch);
	372
	373	// Where to mount this?
77e26129 MT	374	int r = pakfire_path(pakfire, target, "%s", interpreter);
77e26129 MT	375	if (r)
660120b6 MT	376	return r;
	377
	378	// Create directory
520ce66c	379	r = pakfire_mkparentdir(target, 0755);
660120b6 MT	380	if (r)
	381	return r;
	382
	383	// Create an empty file
	384	FILE* f = fopen(target, "w");
	385	if (!f)
	386	return 1;
	387	fclose(f);
	388
	389	r = pakfire_mount(pakfire, interpreter, target, NULL, MS_BIND\|MS_RDONLY, NULL);
	390	if (r)
	391	ERROR(pakfire, "Could not mount interpreter %s to %s: %m\n", interpreter, target);
	392
	393	return r;
	394	}
	395
282b732a	396	int pakfire_mount_all(struct pakfire* pakfire, int flags) {
bf5f9c24	397	char target[PATH_MAX];
bf5f9c24 MT	398	int r;
	399
	400	// Fetch Pakfire's root directory
	401	const char* root = pakfire_get_path(pakfire);
	402
bf5f9c24	403	for (const struct pakfire_mountpoint* mp = mountpoints; mp->source; mp++) {
bf5f9c24	404	// Figure out where to mount
819232d6	405	r = pakfire_path_append(target, root, mp->target);
56796f84	406	if (r)
bf5f9c24 MT	407	return r;
bf5f9c24 MT	408
a685a503 MT	409	// Create target if it doesn't exist
	410	if (!pakfire_path_exists(target)) {
	411	r = pakfire_mkdir(target, 0755);
	412	if (r) {
	413	ERROR(pakfire, "Could not create %s: %m\n", target);
	414	return r;
	415	}
	416	}
bf5f9c24	417
bf5f9c24	418	// Perform mount()
f71c82d8	419	r = pakfire_mount(pakfire, mp->source, target, mp->fstype, mp->flags, mp->options);
a685a503	420	if (r)
bf5f9c24	421	return r;
bf5f9c24 MT	422	}
bf5f9c24 MT	423
f71c82d8	424	// Populate /dev
282b732a	425	r = pakfire_populate_dev(pakfire, flags);
f71c82d8 MT	426	if (r)
	427	return r;
	428
660120b6 MT	429	// Mount the interpreter (if needed)
	430	r = pakfire_mount_interpreter(pakfire);
	431	if (r)
	432	return r;
	433
bf5f9c24 MT	434	return 0;
	435	}
	436
06d741c6 MT	437	int pakfire_make_ramdisk(struct pakfire* pakfire, char* path, const char* args) {
	438	int r;
	439
	440	// Create a new temporary directory
	441	char* p = pakfire_mkdtemp(path);
	442	if (!p)
	443	return -errno;
	444
	445	// Mount the ramdisk
	446	r = pakfire_mount(pakfire, "pakfire_ramdisk", p, "tmpfs", 0, args);
	447	if (r) {
	448	ERROR_ERRNO(pakfire, r, "Could not mount ramdisk at %s (%s): %m\n", p, args);
	449	return r;
	450	}
	451
	452	DEBUG(pakfire, "Ramdisk mounted at %s (%s)\n", p, args);
	453
	454	return 0;
	455	}
	456
061223f7	457	int pakfire_bind(struct pakfire* pakfire, const char* src, const char* dst, int flags) {
163851bc MT	458	struct stat st;
	459	char mountpoint[PATH_MAX];
	460
	461	if (!dst)
	462	dst = src;
	463
77e26129 MT	464	int r = pakfire_path(pakfire, mountpoint, "%s", dst);
	465	if (r)
	466	return r;
163851bc MT	467
	468	DEBUG(pakfire, "Bind-mounting %s to %s\n", src, mountpoint);
	469
	470	r = stat(src, &st);
	471	if (r < 0) {
	472	ERROR(pakfire, "Could not stat %s: %m\n", src);
	473	return 1;
	474	}
	475
	476	// Make sure the mountpoint exists
	477	switch (st.st_mode & S_IFMT) {
	478	case S_IFDIR:
520ce66c	479	r = pakfire_mkdir(mountpoint, st.st_mode);
163851bc MT	480	if (r && errno != EEXIST)
	481	return r;
	482	break;
	483
	484	case S_IFREG:
	485	case S_IFLNK:
	486	// Make parent directory
520ce66c	487	r = pakfire_mkparentdir(mountpoint, 0755);
163851bc MT	488	if (r)
	489	return r;
	490
	491	// Create a file
	492	FILE* f = fopen(mountpoint, "w");
	493	if (!f)
	494	return 1;
	495	fclose(f);
	496	break;
	497
	498	default:
	499	errno = ENOTSUP;
	500	return 1;
	501	}
	502
976fbbc8 MT	503	// The Linux kernel seems to be quite funny when trying to bind-mount something
	504	// as read-only and requires us to mount the source first, and then remount it
	505	// again using MS_RDONLY.
	506	if (flags & MS_RDONLY) {
b16b8753	507	r = pakfire_mount(pakfire, src, mountpoint, "bind", MS_BIND\|MS_REC, NULL);
976fbbc8 MT	508	if (r)
	509	return r;
	510
	511	// Add the remount flag
	512	flags \|= MS_REMOUNT;
	513	}
	514
163851bc	515	// Perform mount
b16b8753	516	return pakfire_mount(pakfire, src, mountpoint, "bind", flags\|MS_BIND\|MS_REC, NULL);
163851bc	517	}