[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/private.h>
#include <pakfire/mount.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[] = {
	{ "pakfire_proc",  "proc",         "proc",  MS_NOSUID|MS_NOEXEC|MS_NODEV, NULL, },

	// Bind mount /proc/sys as read-only with the following exceptions:
	//  * /proc/sys/net
	{ "/proc/sys",     "proc/sys",     "bind",  MS_BIND, NULL, },
	{ "/proc/sys/net", "proc/sys/net", "bind",  MS_BIND, NULL, },
	{ "/proc/sys",     "proc/sys",     "bind",  MS_BIND|MS_RDONLY|MS_REMOUNT, NULL, },

	// Bind mount /sys as read-only
	{ "/sys",          "sys",          "bind",  MS_BIND, NULL, },
	{ "/sys",          "sys",          "bind",  MS_BIND|MS_RDONLY|MS_REMOUNT, NULL, },

	// Create a new /dev
	{ "pakfire_dev",   "dev",          "tmpfs", MS_NOSUID|MS_NOEXEC,
		"mode=755,size=4m,nr_inodes=64k", },
	{ "/dev/pts",      "dev/pts",      "bind",  MS_BIND, NULL, },

	// Create a new /run
	{ "pakfire_tmpfs", "run",          "tmpfs", MS_NOSUID|MS_NOEXEC|MS_NODEV,
		"mode=755,size=4m,nr_inodes=1k", },

	// 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/ptmx",      5,  2, S_IFCHR|S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH, },
	{ "/dev/rtc0",    252,  0, S_IFCHR|S_IRUSR|S_IWUSR, },
	{ NULL },
};

static const struct pakfire_symlink {
	const char* target;
	const char* path;
} symlinks[] = {
	{ "/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_umount(struct pakfire* pakfire, const char* path, int flags) {
	int r;

	DEBUG(pakfire, "Umounting %s\n", path);

RETRY:
	// Perform umount
	r = umount2(path, flags);
	if (r) {
		// Attempt a lazy umount when busy
		if (errno == EBUSY) {
			flags |= MNT_DETACH;
			goto RETRY;
		}

		ERROR(pakfire, "Could not umount %s: %m\n", path);
	}

	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_make_path(pakfire, path, devnode->path);
		if (r < 0)
			return 1;

		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, path, devnode->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_make_path(pakfire, path, s->path);
		if (r < 0)
			return 1;

		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_make_path(pakfire, target, interpreter);
	if (r < 0)
		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 < 0)
			return r;

		// Create target
		pakfire_mkdir(target, 0755);

RETRY:
		// Perform mount()
		r = pakfire_mount(pakfire, mp->source, target, mp->fstype, mp->flags, mp->options);
		if (r) {
			// If the target directory does not exist, we will create it
			if (errno == ENOENT) {
				r = pakfire_mkdir(target, 0755);
				if (r) {
					ERROR(pakfire, "Could not create %s\n", target);
					return r;
				}

				goto RETRY;
			}

			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;
}

static int __pakfire_umount(struct pakfire* pakfire,
		struct libmnt_fs* fs, const void* data) {
	const char* target = mnt_fs_get_target(fs);
	if (!target)
		return 1;

	return pakfire_umount(pakfire, target, 0);
}

/*
	umounts everything that hasn't been umounted, yet
*/
int pakfire_umount_all(struct pakfire* pakfire) {
	return pakfire_mount_foreach(pakfire, MNT_ITER_BACKWARD,
		__pakfire_umount, NULL);
}

PAKFIRE_EXPORT 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_make_path(pakfire, mountpoint, dst);
	if (r < 0)
		return 1;

	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_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>
bf5f9c24 MT	34	#include <pakfire/pakfire.h>
163851bc	35	#include <pakfire/private.h>
bf5f9c24 MT	36	#include <pakfire/mount.h>
	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[] = {
b077d318	46	{ "pakfire_proc", "proc", "proc", MS_NOSUID\|MS_NOEXEC\|MS_NODEV, NULL, },
bf5f9c24 MT	47
	48	// Bind mount /proc/sys as read-only with the following exceptions:
	49	// * /proc/sys/net
b077d318 MT	50	{ "/proc/sys", "proc/sys", "bind", MS_BIND, NULL, },
	51	{ "/proc/sys/net", "proc/sys/net", "bind", MS_BIND, NULL, },
	52	{ "/proc/sys", "proc/sys", "bind", MS_BIND\|MS_RDONLY\|MS_REMOUNT, NULL, },
bf5f9c24 MT	53
bf5f9c24 MT	54	// Bind mount /sys as read-only
b077d318 MT	55	{ "/sys", "sys", "bind", MS_BIND, NULL, },
b077d318 MT	56	{ "/sys", "sys", "bind", MS_BIND\|MS_RDONLY\|MS_REMOUNT, NULL, },
bf5f9c24 MT	57
bf5f9c24 MT	58	// Create a new /dev
b077d318	59	{ "pakfire_dev", "dev", "tmpfs", MS_NOSUID\|MS_NOEXEC,
f71c82d8	60	"mode=755,size=4m,nr_inodes=64k", },
b077d318	61	{ "/dev/pts", "dev/pts", "bind", MS_BIND, NULL, },
bf5f9c24 MT	62
bf5f9c24 MT	63	// Create a new /run
b077d318	64	{ "pakfire_tmpfs", "run", "tmpfs", MS_NOSUID\|MS_NOEXEC\|MS_NODEV,
f71c82d8	65	"mode=755,size=4m,nr_inodes=1k", },
bf5f9c24	66
bf5f9c24 MT	67	// The end
	68	{ NULL },
	69	};
	70
f71c82d8 MT	71	static const struct pakfire_devnode {
	72	const char* path;
	73	int major;
	74	int minor;
	75	mode_t mode;
	76	} devnodes[] = {
	77	{ "/dev/null", 1, 3, S_IFCHR\|S_IRUSR\|S_IWUSR\|S_IRGRP\|S_IWGRP\|S_IROTH\|S_IWOTH, },
	78	{ "/dev/zero", 1, 5, S_IFCHR\|S_IRUSR\|S_IWUSR\|S_IRGRP\|S_IWGRP\|S_IROTH\|S_IWOTH, },
	79	{ "/dev/full", 1, 7, S_IFCHR\|S_IRUSR\|S_IWUSR\|S_IRGRP\|S_IWGRP\|S_IROTH\|S_IWOTH, },
	80	{ "/dev/random", 1, 8, S_IFCHR\|S_IRUSR\|S_IRGRP\|S_IROTH, },
	81	{ "/dev/urandom", 1, 9, S_IFCHR\|S_IRUSR\|S_IRGRP\|S_IROTH, },
	82	{ "/dev/kmsg", 1, 11, S_IFCHR\|S_IRUSR\|S_IRGRP\|S_IROTH, },
	83	{ "/dev/tty", 5, 0, S_IFCHR\|S_IRUSR\|S_IWUSR\|S_IRGRP\|S_IWGRP\|S_IROTH\|S_IWOTH, },
	84	{ "/dev/console", 5, 1, S_IFCHR\|S_IRUSR\|S_IWUSR, },
	85	{ "/dev/ptmx", 5, 2, S_IFCHR\|S_IRUSR\|S_IWUSR\|S_IRGRP\|S_IWGRP\|S_IROTH\|S_IWOTH, },
	86	{ "/dev/rtc0", 252, 0, S_IFCHR\|S_IRUSR\|S_IWUSR, },
	87	{ NULL },
	88	};
dc01afb6	89
f71c82d8 MT	90	static const struct pakfire_symlink {
	91	const char* target;
	92	const char* path;
	93	} symlinks[] = {
	94	{ "/proc/self/fd", "/dev/fd", },
	95	{ "/proc/self/fd/0", "/dev/stdin" },
	96	{ "/proc/self/fd/1", "/dev/stdout" },
	97	{ "/proc/self/fd/2", "/dev/stderr" },
	98	{ "/proc/kcore", "/dev/core" },
	99	{ NULL },
	100	};
dc01afb6	101
bf5f9c24 MT	102	/*
	103	Easy way to iterate through all mountpoints
	104	*/
0ea82518 MT	105	static int pakfire_mount_foreach(struct pakfire* pakfire, int direction,
0ea82518 MT	106	int (callback)(struct pakfire pakfire, struct libmnt_fs* fs, const void* data),
f71c82d8	107	const void* data) {
bf5f9c24	108	const char* root = pakfire_get_path(pakfire);
ec64a612	109	int r = 0;
bf5f9c24	110
0ea82518 MT	111	struct libmnt_iter* iterator = NULL;
	112	struct libmnt_table* tab = NULL;
	113	struct libmnt_fs* fs = NULL;
	114
	115	// Create an iterator
	116	iterator = mnt_new_iter(direction);
	117	if (!iterator) {
	118	ERROR(pakfire, "Could not setup iterator: %m\n");
	119	goto ERROR;
	120	}
	121
	122	// Read /proc/mounts
	123	tab = mnt_new_table_from_file("/proc/mounts");
	124	if (!tab) {
bf5f9c24	125	ERROR(pakfire, "Could not open /proc/mounts: %m\n");
0ea82518	126	goto ERROR;
bf5f9c24 MT	127	}
bf5f9c24 MT	128
0ea82518 MT	129	while (mnt_table_next_fs(tab, iterator, &fs) == 0) {
0ea82518 MT	130	const char* target = mnt_fs_get_target(fs);
bf5f9c24 MT	131
bf5f9c24 MT	132	// Ignore any mointpoints that don't belong to us
0ea82518	133	if (!pakfire_string_startswith(target, root))
bf5f9c24 MT	134	continue;
bf5f9c24 MT	135
bf5f9c24	136	// Call the callback for each relevant mountpoint
0ea82518	137	r = callback(pakfire, fs, data);
bf5f9c24 MT	138	if (r)
	139	break;
	140	}
	141
0ea82518	142	ERROR:
bf5f9c24	143	// Tidy up
0ea82518 MT	144	if (fs)
	145	mnt_unref_fs(fs);
	146	if (tab)
	147	mnt_unref_table(tab);
	148	if (iterator)
	149	mnt_free_iter(iterator);
bf5f9c24 MT	150
	151	return r;
	152	}
	153
	154	static int __pakfire_is_mountpoint(struct pakfire* pakfire,
0ea82518	155	struct libmnt_fs* fs, const void* data) {
bf5f9c24 MT	156	const char* path = (const char*)data;
bf5f9c24 MT	157
0ea82518	158	return mnt_fs_streq_target(fs, path);
bf5f9c24 MT	159	}
	160
	161	int pakfire_is_mountpoint(struct pakfire* pakfire, const char* path) {
0ea82518	162	return pakfire_mount_foreach(pakfire, MNT_ITER_FORWARD,
f71c82d8	163	__pakfire_is_mountpoint, path);
bf5f9c24 MT	164	}
bf5f9c24 MT	165
163851bc	166	static int pakfire_mount(struct pakfire* pakfire, const char* source, const char* target,
bf5f9c24 MT	167	const char* fstype, unsigned long mflags, const void* data) {
bf5f9c24 MT	168	const char* options = (const char*)data;
bf5f9c24 MT	169
	170	// Check for some basic inputs
	171	if (!source \|\| !target) {
	172	errno = EINVAL;
	173	return 1;
	174	}
	175
7f970e6e	176	DEBUG(pakfire, "Mounting %s from %s (%s - %s)\n", target, source, fstype, options);
bf5f9c24	177
7f970e6e MT	178	// Perform mount()
7f970e6e MT	179	int r = mount(source, target, fstype, mflags, data);
bf5f9c24	180	if (r) {
7f970e6e	181	ERROR(pakfire, "Could not mount %s: %m\n", target);
bf5f9c24 MT	182	}
bf5f9c24 MT	183
bf5f9c24 MT	184	return r;
	185	}
	186
	187	static int pakfire_umount(struct pakfire* pakfire, const char* path, int flags) {
	188	int r;
	189
	190	DEBUG(pakfire, "Umounting %s\n", path);
	191
	192	RETRY:
	193	// Perform umount
	194	r = umount2(path, flags);
	195	if (r) {
	196	// Attempt a lazy umount when busy
	197	if (errno == EBUSY) {
	198	flags \|= MNT_DETACH;
	199	goto RETRY;
	200	}
	201
	202	ERROR(pakfire, "Could not umount %s: %m\n", path);
	203	}
	204
	205	return r;
	206	}
	207
	208	static int __pakfire_mount_print(struct pakfire* pakfire,
0ea82518 MT	209	struct libmnt_fs* fs, const void* data) {
	210	DEBUG(pakfire,
	211	" %s %s %s %s\n",
	212	mnt_fs_get_source(fs),
	213	mnt_fs_get_target(fs),
	214	mnt_fs_get_fstype(fs),
	215	mnt_fs_get_fs_options(fs)
bf5f9c24 MT	216	);
	217
	218	return 0;
	219	}
	220
91247a7b MT	221	int pakfire_mount_list(struct pakfire* pakfire) {
91247a7b MT	222	DEBUG(pakfire, "Mountpoints:\n");
bf5f9c24	223
0ea82518	224	return pakfire_mount_foreach(pakfire, MNT_ITER_FORWARD,
f71c82d8 MT	225	__pakfire_mount_print, NULL);
	226	}
	227
	228	static int pakfire_populate_dev(struct pakfire* pakfire) {
	229	char path[PATH_MAX];
	230
	231	// Create device nodes
	232	for (const struct pakfire_devnode* devnode = devnodes; devnode->path; devnode++) {
	233	DEBUG(pakfire, "Creating device node %s\n", devnode->path);
	234
	235	int r = pakfire_make_path(pakfire, path, devnode->path);
	236	if (r < 0)
	237	return 1;
	238
	239	dev_t dev = makedev(devnode->major, devnode->minor);
	240
	241	r = mknod(path, devnode->mode, dev);
8f1003a3 MT	242
	243	// Continue if mknod was successful
	244	if (r == 0)
	245	continue;
	246
	247	// If we could not create the device node because of permission issues,
	248	// it might be likely that we are running in a user namespace where creating
	249	// device nodes is not permitted. Try bind-mounting them.
	250	if (errno == EPERM)
	251	goto MOUNT;
	252
	253	// Otherwise log an error and end
	254	ERROR(pakfire, "Could not create %s: %m\n", devnode->path);
	255	return r;
	256
	257	MOUNT:
	258	// Create an empty file
	259	r = pakfire_touch(path, 0444);
f71c82d8	260	if (r) {
8f1003a3	261	ERROR(pakfire, "Could not create %s: %m\n", path);
f71c82d8 MT	262	return r;
f71c82d8 MT	263	}
8f1003a3 MT	264
	265	// Create a bind-mount over the file
	266	r = pakfire_mount(pakfire, path, devnode->path, "bind", MS_BIND, NULL);
	267	if (r)
	268	return r;
f71c82d8 MT	269	}
	270
	271	// Create symlinks
	272	for (const struct pakfire_symlink* s = symlinks; s->target; s++) {
	273	DEBUG(pakfire, "Creating symlink %s -> %s\n", s->path, s->target);
	274
	275	int r = pakfire_make_path(pakfire, path, s->path);
	276	if (r < 0)
	277	return 1;
	278
	279	r = symlink(s->target, path);
	280	if (r) {
	281	ERROR(pakfire, "Could not create symlink %s: %m\n", s->path);
	282	return r;
	283	}
	284	}
	285
	286	return 0;
bf5f9c24 MT	287	}
bf5f9c24 MT	288
660120b6 MT	289	static int pakfire_mount_interpreter(struct pakfire* pakfire) {
	290	char target[PATH_MAX];
	291
	292	// Fetch the target architecture
	293	const char* arch = pakfire_get_arch(pakfire);
	294
	295	// Can we emulate this architecture?
	296	char* interpreter = pakfire_arch_find_interpreter(arch);
	297
	298	// No interpreter required
	299	if (!interpreter)
	300	return 0;
	301
	302	DEBUG(pakfire, "Mounting interpreter %s for %s\n", interpreter, arch);
	303
	304	// Where to mount this?
	305	int r = pakfire_make_path(pakfire, target, interpreter);
	306	if (r < 0)
	307	return r;
	308
	309	// Create directory
520ce66c	310	r = pakfire_mkparentdir(target, 0755);
660120b6 MT	311	if (r)
	312	return r;
	313
	314	// Create an empty file
	315	FILE* f = fopen(target, "w");
	316	if (!f)
	317	return 1;
	318	fclose(f);
	319
	320	r = pakfire_mount(pakfire, interpreter, target, NULL, MS_BIND\|MS_RDONLY, NULL);
	321	if (r)
	322	ERROR(pakfire, "Could not mount interpreter %s to %s: %m\n", interpreter, target);
	323
	324	return r;
	325	}
	326
f71c82d8	327	int pakfire_mount_all(struct pakfire* pakfire) {
bf5f9c24	328	char target[PATH_MAX];
bf5f9c24 MT	329	int r;
	330
	331	// Fetch Pakfire's root directory
	332	const char* root = pakfire_get_path(pakfire);
	333
bf5f9c24	334	for (const struct pakfire_mountpoint* mp = mountpoints; mp->source; mp++) {
bf5f9c24 MT	335	// Figure out where to mount
	336	r = pakfire_path_join(target, root, mp->target);
	337	if (r < 0)
	338	return r;
	339
bf5f9c24	340	// Create target
520ce66c	341	pakfire_mkdir(target, 0755);
bf5f9c24 MT	342
	343	RETRY:
	344	// Perform mount()
f71c82d8	345	r = pakfire_mount(pakfire, mp->source, target, mp->fstype, mp->flags, mp->options);
bf5f9c24 MT	346	if (r) {
	347	// If the target directory does not exist, we will create it
	348	if (errno == ENOENT) {
520ce66c	349	r = pakfire_mkdir(target, 0755);
bf5f9c24 MT	350	if (r) {
	351	ERROR(pakfire, "Could not create %s\n", target);
	352	return r;
	353	}
	354
	355	goto RETRY;
	356	}
	357
bf5f9c24 MT	358	return r;
	359	}
	360	}
	361
f71c82d8 MT	362	// Populate /dev
	363	r = pakfire_populate_dev(pakfire);
	364	if (r)
	365	return r;
	366
660120b6 MT	367	// Mount the interpreter (if needed)
	368	r = pakfire_mount_interpreter(pakfire);
	369	if (r)
	370	return r;
	371
bf5f9c24 MT	372	return 0;
	373	}
	374
	375	static int __pakfire_umount(struct pakfire* pakfire,
0ea82518 MT	376	struct libmnt_fs* fs, const void* data) {
	377	const char* target = mnt_fs_get_target(fs);
	378	if (!target)
	379	return 1;
	380
	381	return pakfire_umount(pakfire, target, 0);
bf5f9c24 MT	382	}
	383
	384	/*
	385	umounts everything that hasn't been umounted, yet
	386	*/
f71c82d8	387	int pakfire_umount_all(struct pakfire* pakfire) {
0ea82518	388	return pakfire_mount_foreach(pakfire, MNT_ITER_BACKWARD,
f71c82d8	389	__pakfire_umount, NULL);
bf5f9c24	390	}
163851bc MT	391
	392	PAKFIRE_EXPORT int pakfire_bind(struct pakfire* pakfire, const char* src, const char* dst, int flags) {
	393	struct stat st;
	394	char mountpoint[PATH_MAX];
	395
	396	if (!dst)
	397	dst = src;
	398
	399	int r = pakfire_make_path(pakfire, mountpoint, dst);
	400	if (r < 0)
	401	return 1;
	402
	403	DEBUG(pakfire, "Bind-mounting %s to %s\n", src, mountpoint);
	404
	405	r = stat(src, &st);
	406	if (r < 0) {
	407	ERROR(pakfire, "Could not stat %s: %m\n", src);
	408	return 1;
	409	}
	410
	411	// Make sure the mountpoint exists
	412	switch (st.st_mode & S_IFMT) {
	413	case S_IFDIR:
520ce66c	414	r = pakfire_mkdir(mountpoint, st.st_mode);
163851bc MT	415	if (r && errno != EEXIST)
	416	return r;
	417	break;
	418
	419	case S_IFREG:
	420	case S_IFLNK:
	421	// Make parent directory
520ce66c	422	r = pakfire_mkparentdir(mountpoint, 0755);
163851bc MT	423	if (r)
	424	return r;
	425
	426	// Create a file
	427	FILE* f = fopen(mountpoint, "w");
	428	if (!f)
	429	return 1;
	430	fclose(f);
	431	break;
	432
	433	default:
	434	errno = ENOTSUP;
	435	return 1;
	436	}
	437
	438	// Perform mount
	439	return pakfire_mount(pakfire, src, mountpoint, NULL, flags\|MS_BIND, NULL);
	440	}