[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=1024m", },

	// The end
	{ NULL },
};

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

/*
	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) {
	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);

		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) {
	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);
	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;
	}

	// Perform mount
	return pakfire_mount(pakfire, src, mountpoint, NULL, flags|MS_REC|MS_BIND, 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",
	96	MS_NOSUID\|MS_NODEV\|MS_STRICTATIME, "mode=1777,size=1024m", },
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;
	107	} devnodes[] = {
	108	{ "/dev/null", 1, 3, S_IFCHR\|S_IRUSR\|S_IWUSR\|S_IRGRP\|S_IWGRP\|S_IROTH\|S_IWOTH, },
	109	{ "/dev/zero", 1, 5, S_IFCHR\|S_IRUSR\|S_IWUSR\|S_IRGRP\|S_IWGRP\|S_IROTH\|S_IWOTH, },
	110	{ "/dev/full", 1, 7, S_IFCHR\|S_IRUSR\|S_IWUSR\|S_IRGRP\|S_IWGRP\|S_IROTH\|S_IWOTH, },
	111	{ "/dev/random", 1, 8, S_IFCHR\|S_IRUSR\|S_IRGRP\|S_IROTH, },
	112	{ "/dev/urandom", 1, 9, S_IFCHR\|S_IRUSR\|S_IRGRP\|S_IROTH, },
	113	{ "/dev/kmsg", 1, 11, S_IFCHR\|S_IRUSR\|S_IRGRP\|S_IROTH, },
	114	{ "/dev/tty", 5, 0, S_IFCHR\|S_IRUSR\|S_IWUSR\|S_IRGRP\|S_IWGRP\|S_IROTH\|S_IWOTH, },
	115	{ "/dev/console", 5, 1, S_IFCHR\|S_IRUSR\|S_IWUSR, },
f71c82d8 MT	116	{ "/dev/rtc0", 252, 0, S_IFCHR\|S_IRUSR\|S_IWUSR, },
	117	{ NULL },
	118	};
dc01afb6	119
f71c82d8 MT	120	static const struct pakfire_symlink {
	121	const char* target;
	122	const char* path;
	123	} symlinks[] = {
0675c514	124	{ "/dev/pts/ptmx", "/dev/ptmx", },
f71c82d8 MT	125	{ "/proc/self/fd", "/dev/fd", },
	126	{ "/proc/self/fd/0", "/dev/stdin" },
	127	{ "/proc/self/fd/1", "/dev/stdout" },
	128	{ "/proc/self/fd/2", "/dev/stderr" },
	129	{ "/proc/kcore", "/dev/core" },
	130	{ NULL },
	131	};
dc01afb6	132
bf5f9c24 MT	133	/*
	134	Easy way to iterate through all mountpoints
	135	*/
0ea82518 MT	136	static int pakfire_mount_foreach(struct pakfire* pakfire, int direction,
0ea82518 MT	137	int (callback)(struct pakfire pakfire, struct libmnt_fs* fs, const void* data),
f71c82d8	138	const void* data) {
bf5f9c24	139	const char* root = pakfire_get_path(pakfire);
ec64a612	140	int r = 0;
bf5f9c24	141
0ea82518 MT	142	struct libmnt_iter* iterator = NULL;
	143	struct libmnt_table* tab = NULL;
	144	struct libmnt_fs* fs = NULL;
	145
	146	// Create an iterator
	147	iterator = mnt_new_iter(direction);
	148	if (!iterator) {
	149	ERROR(pakfire, "Could not setup iterator: %m\n");
	150	goto ERROR;
	151	}
	152
	153	// Read /proc/mounts
	154	tab = mnt_new_table_from_file("/proc/mounts");
	155	if (!tab) {
bf5f9c24	156	ERROR(pakfire, "Could not open /proc/mounts: %m\n");
0ea82518	157	goto ERROR;
bf5f9c24 MT	158	}
bf5f9c24 MT	159
0ea82518 MT	160	while (mnt_table_next_fs(tab, iterator, &fs) == 0) {
0ea82518 MT	161	const char* target = mnt_fs_get_target(fs);
bf5f9c24 MT	162
bf5f9c24 MT	163	// Ignore any mointpoints that don't belong to us
0ea82518	164	if (!pakfire_string_startswith(target, root))
bf5f9c24 MT	165	continue;
bf5f9c24 MT	166
bf5f9c24	167	// Call the callback for each relevant mountpoint
0ea82518	168	r = callback(pakfire, fs, data);
bf5f9c24 MT	169	if (r)
	170	break;
	171	}
	172
0ea82518	173	ERROR:
bf5f9c24	174	// Tidy up
0ea82518 MT	175	if (fs)
	176	mnt_unref_fs(fs);
	177	if (tab)
	178	mnt_unref_table(tab);
	179	if (iterator)
	180	mnt_free_iter(iterator);
bf5f9c24 MT	181
	182	return r;
	183	}
	184
	185	static int __pakfire_is_mountpoint(struct pakfire* pakfire,
0ea82518	186	struct libmnt_fs* fs, const void* data) {
bf5f9c24 MT	187	const char* path = (const char*)data;
bf5f9c24 MT	188
0ea82518	189	return mnt_fs_streq_target(fs, path);
bf5f9c24 MT	190	}
	191
	192	int pakfire_is_mountpoint(struct pakfire* pakfire, const char* path) {
0ea82518	193	return pakfire_mount_foreach(pakfire, MNT_ITER_FORWARD,
f71c82d8	194	__pakfire_is_mountpoint, path);
bf5f9c24 MT	195	}
bf5f9c24 MT	196
163851bc	197	static int pakfire_mount(struct pakfire* pakfire, const char* source, const char* target,
bf5f9c24 MT	198	const char* fstype, unsigned long mflags, const void* data) {
bf5f9c24 MT	199	const char* options = (const char*)data;
bf5f9c24 MT	200
	201	// Check for some basic inputs
	202	if (!source \|\| !target) {
	203	errno = EINVAL;
	204	return 1;
	205	}
	206
7f970e6e	207	DEBUG(pakfire, "Mounting %s from %s (%s - %s)\n", target, source, fstype, options);
bf5f9c24	208
7f970e6e MT	209	// Perform mount()
7f970e6e MT	210	int r = mount(source, target, fstype, mflags, data);
bf5f9c24	211	if (r) {
7f970e6e	212	ERROR(pakfire, "Could not mount %s: %m\n", target);
bf5f9c24 MT	213	}
bf5f9c24 MT	214
bf5f9c24 MT	215	return r;
	216	}
	217
bf5f9c24	218	static int __pakfire_mount_print(struct pakfire* pakfire,
0ea82518 MT	219	struct libmnt_fs* fs, const void* data) {
	220	DEBUG(pakfire,
	221	" %s %s %s %s\n",
	222	mnt_fs_get_source(fs),
	223	mnt_fs_get_target(fs),
	224	mnt_fs_get_fstype(fs),
	225	mnt_fs_get_fs_options(fs)
bf5f9c24 MT	226	);
	227
	228	return 0;
	229	}
	230
91247a7b MT	231	int pakfire_mount_list(struct pakfire* pakfire) {
91247a7b MT	232	DEBUG(pakfire, "Mountpoints:\n");
bf5f9c24	233
0ea82518	234	return pakfire_mount_foreach(pakfire, MNT_ITER_FORWARD,
f71c82d8 MT	235	__pakfire_mount_print, NULL);
	236	}
	237
	238	static int pakfire_populate_dev(struct pakfire* pakfire) {
	239	char path[PATH_MAX];
	240
	241	// Create device nodes
	242	for (const struct pakfire_devnode* devnode = devnodes; devnode->path; devnode++) {
	243	DEBUG(pakfire, "Creating device node %s\n", devnode->path);
	244
77e26129 MT	245	int r = pakfire_path(pakfire, path, "%s", devnode->path);
	246	if (r)
	247	return r;
f71c82d8 MT	248
	249	dev_t dev = makedev(devnode->major, devnode->minor);
	250
	251	r = mknod(path, devnode->mode, dev);
8f1003a3 MT	252
	253	// Continue if mknod was successful
	254	if (r == 0)
	255	continue;
	256
	257	// If we could not create the device node because of permission issues,
	258	// it might be likely that we are running in a user namespace where creating
	259	// device nodes is not permitted. Try bind-mounting them.
	260	if (errno == EPERM)
	261	goto MOUNT;
	262
	263	// Otherwise log an error and end
	264	ERROR(pakfire, "Could not create %s: %m\n", devnode->path);
	265	return r;
	266
	267	MOUNT:
	268	// Create an empty file
	269	r = pakfire_touch(path, 0444);
f71c82d8	270	if (r) {
8f1003a3	271	ERROR(pakfire, "Could not create %s: %m\n", path);
f71c82d8 MT	272	return r;
f71c82d8 MT	273	}
8f1003a3 MT	274
8f1003a3 MT	275	// Create a bind-mount over the file
64e3b4ff	276	r = pakfire_mount(pakfire, devnode->path, path, "bind", MS_BIND, NULL);
8f1003a3 MT	277	if (r)
8f1003a3 MT	278	return r;
f71c82d8 MT	279	}
	280
	281	// Create symlinks
	282	for (const struct pakfire_symlink* s = symlinks; s->target; s++) {
	283	DEBUG(pakfire, "Creating symlink %s -> %s\n", s->path, s->target);
	284
77e26129 MT	285	int r = pakfire_path(pakfire, path, "%s", s->path);
	286	if (r)
	287	return r;
f71c82d8 MT	288
	289	r = symlink(s->target, path);
	290	if (r) {
	291	ERROR(pakfire, "Could not create symlink %s: %m\n", s->path);
	292	return r;
	293	}
	294	}
	295
	296	return 0;
bf5f9c24 MT	297	}
bf5f9c24 MT	298
660120b6 MT	299	static int pakfire_mount_interpreter(struct pakfire* pakfire) {
	300	char target[PATH_MAX];
	301
	302	// Fetch the target architecture
	303	const char* arch = pakfire_get_arch(pakfire);
	304
	305	// Can we emulate this architecture?
	306	char* interpreter = pakfire_arch_find_interpreter(arch);
	307
	308	// No interpreter required
	309	if (!interpreter)
	310	return 0;
	311
	312	DEBUG(pakfire, "Mounting interpreter %s for %s\n", interpreter, arch);
	313
	314	// Where to mount this?
77e26129 MT	315	int r = pakfire_path(pakfire, target, "%s", interpreter);
77e26129 MT	316	if (r)
660120b6 MT	317	return r;
	318
	319	// Create directory
520ce66c	320	r = pakfire_mkparentdir(target, 0755);
660120b6 MT	321	if (r)
	322	return r;
	323
	324	// Create an empty file
	325	FILE* f = fopen(target, "w");
	326	if (!f)
	327	return 1;
	328	fclose(f);
	329
	330	r = pakfire_mount(pakfire, interpreter, target, NULL, MS_BIND\|MS_RDONLY, NULL);
	331	if (r)
	332	ERROR(pakfire, "Could not mount interpreter %s to %s: %m\n", interpreter, target);
	333
	334	return r;
	335	}
	336
f71c82d8	337	int pakfire_mount_all(struct pakfire* pakfire) {
bf5f9c24	338	char target[PATH_MAX];
bf5f9c24 MT	339	int r;
	340
	341	// Fetch Pakfire's root directory
	342	const char* root = pakfire_get_path(pakfire);
	343
bf5f9c24	344	for (const struct pakfire_mountpoint* mp = mountpoints; mp->source; mp++) {
bf5f9c24 MT	345	// Figure out where to mount
bf5f9c24 MT	346	r = pakfire_path_join(target, root, mp->target);
56796f84	347	if (r)
bf5f9c24 MT	348	return r;
bf5f9c24 MT	349
a685a503 MT	350	// Create target if it doesn't exist
	351	if (!pakfire_path_exists(target)) {
	352	r = pakfire_mkdir(target, 0755);
	353	if (r) {
	354	ERROR(pakfire, "Could not create %s: %m\n", target);
	355	return r;
	356	}
	357	}
bf5f9c24	358
bf5f9c24	359	// Perform mount()
f71c82d8	360	r = pakfire_mount(pakfire, mp->source, target, mp->fstype, mp->flags, mp->options);
a685a503	361	if (r)
bf5f9c24	362	return r;
bf5f9c24 MT	363	}
bf5f9c24 MT	364
f71c82d8 MT	365	// Populate /dev
	366	r = pakfire_populate_dev(pakfire);
	367	if (r)
	368	return r;
	369
660120b6 MT	370	// Mount the interpreter (if needed)
	371	r = pakfire_mount_interpreter(pakfire);
	372	if (r)
	373	return r;
	374
bf5f9c24 MT	375	return 0;
	376	}
	377
061223f7	378	int pakfire_bind(struct pakfire* pakfire, const char* src, const char* dst, int flags) {
163851bc MT	379	struct stat st;
	380	char mountpoint[PATH_MAX];
	381
	382	if (!dst)
	383	dst = src;
	384
77e26129 MT	385	int r = pakfire_path(pakfire, mountpoint, "%s", dst);
	386	if (r)
	387	return r;
163851bc MT	388
	389	DEBUG(pakfire, "Bind-mounting %s to %s\n", src, mountpoint);
	390
	391	r = stat(src, &st);
	392	if (r < 0) {
	393	ERROR(pakfire, "Could not stat %s: %m\n", src);
	394	return 1;
	395	}
	396
	397	// Make sure the mountpoint exists
	398	switch (st.st_mode & S_IFMT) {
	399	case S_IFDIR:
520ce66c	400	r = pakfire_mkdir(mountpoint, st.st_mode);
163851bc MT	401	if (r && errno != EEXIST)
	402	return r;
	403	break;
	404
	405	case S_IFREG:
	406	case S_IFLNK:
	407	// Make parent directory
520ce66c	408	r = pakfire_mkparentdir(mountpoint, 0755);
163851bc MT	409	if (r)
	410	return r;
	411
	412	// Create a file
	413	FILE* f = fopen(mountpoint, "w");
	414	if (!f)
	415	return 1;
	416	fclose(f);
	417	break;
	418
	419	default:
	420	errno = ENOTSUP;
	421	return 1;
	422	}
	423
	424	// Perform mount
cc6e2264	425	return pakfire_mount(pakfire, src, mountpoint, NULL, flags\|MS_REC\|MS_BIND, NULL);
163851bc	426	}