minix/commands/pkg_install/lib/plist.c

/*	$NetBSD: plist.c,v 1.29 2009/08/02 17:56:45 joerg Exp $	*/

#if HAVE_CONFIG_H
#include "config.h"
#endif
#ifndef __minix
#include <nbcompat.h>
#endif
#if HAVE_SYS_CDEFS_H
#include <sys/cdefs.h>
#endif
#ifndef __minix
__RCSID("$NetBSD: plist.c,v 1.29 2009/08/02 17:56:45 joerg Exp $");
#endif

/*
 * FreeBSD install - a package for the installation and maintainance
 * of non-core utilities.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * Jordan K. Hubbard
 * 18 July 1993
 *
 * General packing list routines.
 *
 */

/*-
 * Copyright (c) 2008, 2009 Joerg Sonnenberger <joerg@NetBSD.org>.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include "lib.h"
#if HAVE_ERRNO_H
#include <errno.h>
#endif
#if HAVE_ERR_H
#include <err.h>
#endif
#if defined(NETBSD)
#include <md5.h>
#elif defined(__minix)
#include <minix/md5.h>
#else
#include <nbcompat/md5.h>
#endif

static int     delete_with_parents(const char *, Boolean, Boolean);

/* This struct defines a plist command type */
typedef struct cmd_t {
	const char   *c_s;		/* string to recognise */
	pl_ent_t c_type;	/* type of command */
	int     c_argc;		/* # of arguments */
	int     c_subst;	/* can substitute real prefix */
}       cmd_t;

/* Commands to recognise */
static const cmd_t cmdv[] = {
	{"cwd", PLIST_CWD, 1, 1},
	{"src", PLIST_SRC, 1, 1},
	{"exec", PLIST_CMD, 1, 0},
	{"unexec", PLIST_UNEXEC, 1, 0},
	{"mode", PLIST_CHMOD, 1, 0},
	{"owner", PLIST_CHOWN, 1, 0},
	{"group", PLIST_CHGRP, 1, 0},
	{"comment", PLIST_COMMENT, 1, 0},
	{"ignore", PLIST_IGNORE, 0, 0},
	{"name", PLIST_NAME, 1, 0},
	{"display", PLIST_DISPLAY, 1, 0},
	{"pkgdep", PLIST_PKGDEP, 1, 0},
	{"pkgcfl", PLIST_PKGCFL, 1, 0},
	{"pkgdir", PLIST_PKGDIR, 1, 0},
	{"dirrm", PLIST_DIR_RM, 1, 0},
	{"option", PLIST_OPTION, 1, 0},
	{"blddep", PLIST_BLDDEP, 1, 0},
	{NULL, FAIL, 0, 0}
};

/*
 * Add an item to the end of a packing list
 */
void
add_plist(package_t *p, pl_ent_t type, const char *arg)
{
	plist_t *tmp;

	tmp = new_plist_entry();
	tmp->name = (arg == NULL) ? NULL : xstrdup(arg);
	tmp->type = type;
	if (!p->head) {
		p->head = p->tail = tmp;
	} else {
		tmp->prev = p->tail;
		p->tail->next = tmp;
		p->tail = tmp;
	}
}

/*
 * Add an item to the start of a packing list
 */
void
add_plist_top(package_t *p, pl_ent_t type, const char *arg)
{
	plist_t *tmp;

	tmp = new_plist_entry();
	tmp->name = (arg == NULL) ? NULL : xstrdup(arg);
	tmp->type = type;
	if (!p->head) {
		p->head = p->tail = tmp;
	} else {
		tmp->next = p->head;
		p->head->prev = tmp;
		p->head = tmp;
	}
}

/*
 * Return the last (most recent) entry in a packing list
 */
plist_t *
last_plist(package_t *p)
{
	return p->tail;
}

/*
 * Mark all items in a packing list to prevent iteration over them
 */
void
mark_plist(package_t *pkg)
{
	plist_t *pp;

	for (pp = pkg->head; pp; pp = pp->next) {
		pp->marked = TRUE;
	}
}

/*
 * Find a given item in a packing list and, if so, return it (else NULL)
 */
plist_t *
find_plist(package_t *pkg, pl_ent_t type)
{
	plist_t *pp;

	for (pp = pkg->head; pp && pp->type != type; pp = pp->next) {
	}
	return pp;
}

/*
 * Look for a specific boolean option argument in the list
 */
char   *
find_plist_option(package_t *pkg, const char *name)
{
	plist_t *p;

	for (p = pkg->head; p; p = p->next) {
		if (p->type == PLIST_OPTION
		    && strcmp(p->name, name) == 0) {
			return p->name;
		}
	}
	
	return (char *) NULL;
}

/*
 * Delete plist item 'type' in the list (if 'name' is non-null, match it
 * too.)  If 'all' is set, delete all items, not just the first occurance.
 */
void
delete_plist(package_t *pkg, Boolean all, pl_ent_t type, char *name)
{
	plist_t *p = pkg->head;

	while (p) {
		plist_t *pnext = p->next;

		if (p->type == type && (!name || !strcmp(name, p->name))) {
			free(p->name);
			if (p->prev)
				p->prev->next = pnext;
			else
				pkg->head = pnext;
			if (pnext)
				pnext->prev = p->prev;
			else
				pkg->tail = p->prev;
			free(p);
			if (!all)
				return;
			p = pnext;
		} else
			p = p->next;
	}
}

/*
 * Allocate a new packing list entry, and return a pointer to it. 
 */
plist_t *
new_plist_entry(void)
{
	return xcalloc(1, sizeof(plist_t));
}

/*
 * Free an entire packing list
 */
void
free_plist(package_t *pkg)
{
	plist_t *p = pkg->head;

	while (p) {
		plist_t *p1 = p->next;

		free(p->name);
		free(p);
		p = p1;
	}
	pkg->head = pkg->tail = NULL;
}

/*
 * For an ASCII string denoting a plist command, return its code and
 * optionally its argument(s)
 */
static int
plist_cmd(const char *s, char **arg)
{
	const cmd_t *cmdp;
	const char *cp, *sp;
	char *sp2;

	sp = NULL; /* Older GCC can't detect that the loop is executed */

	for (cmdp = cmdv; cmdp->c_s; ++cmdp) {
		for (sp = s, cp = cmdp->c_s; *sp && *cp; ++cp, ++sp)
			if (*sp != *cp)
				break;
		if (*cp == '\0')
			break;
	}

	if (cmdp->c_s == NULL || arg == NULL)
		return cmdp->c_type;

	while (isspace((unsigned char)*sp))
		++sp;
	*arg = xstrdup(sp);
	if (*sp) {
		sp2 = *arg + strlen(*arg) - 1;
		/*
		 * The earlier loop ensured that at least one non-whitespace
		 * is in the string.
		 */
		while (isspace((unsigned char)*sp2))
			--sp2;
		sp2[1] = '\0';
	}
	return cmdp->c_type;
}

/*
 * Parse a packaging list from a memory buffer.
 */
void
parse_plist(package_t *pkg, const char *buf)
{
	int cmd;
	char *line, *cp;
	const char *eol, *next;
	size_t len;

	pkg->head = NULL;
	pkg->tail = NULL;

	for (; *buf; buf = next) {
		/* Until add_plist can deal with trailing whitespace. */
		if ((eol = strchr(buf, '\n')) != NULL) {
			next = eol + 1;
			len = eol - buf;
		} else {
			len = strlen(buf);
			next = buf + len;
		}

		while (len && isspace((unsigned char)buf[len - 1]))
			--len;

		if (len == 0)
			continue;

		line = xmalloc(len + 1);
		memcpy(line, buf, len);
		line[len] = '\0';

		if (*(cp = line) == CMD_CHAR) {
			if ((cmd = plist_cmd(line + 1, &cp)) == FAIL) {
				warnx("Unrecognised PLIST command `%s'", line);
				continue;
			}
			if (*cp == '\0') {
				free(cp);
				cp = NULL;
			}
		} else {
			cmd = PLIST_FILE;
		}
		add_plist(pkg, cmd, cp);
		free(cp);
	}
}

/*
 * Read a packing list from a file
 */
void
append_plist(package_t *pkg, FILE * fp)
{
	char    pline[MaxPathSize];
	char   *cp;
	int     cmd;
	int     len;
	int	free_cp;

	while (fgets(pline, MaxPathSize, fp) != (char *) NULL) {
		for (len = strlen(pline); len &&
		    isspace((unsigned char) pline[len - 1]);) {
			pline[--len] = '\0';
		}
		if (len == 0) {
			continue;
		}
		free_cp = 0;
		if (*(cp = pline) == CMD_CHAR) {
			if ((cmd = plist_cmd(pline + 1, &cp)) == FAIL) {
				warnx("Unrecognised PLIST command `%s'", pline);
				continue;
			}
			if (*cp == '\0') {
				free(cp);
				cp = NULL;
			}
			free_cp = 1;
		} else {
			cmd = PLIST_FILE;
		}
		add_plist(pkg, cmd, cp);
		if (free_cp)
			free(cp);
	}
}

void
read_plist(package_t *pkg, FILE * fp)
{
	pkg->head = NULL;
	pkg->tail = NULL;

	append_plist(pkg, fp);
}

/*
 * Write a packing list to a file, converting commands to ASCII equivs
 */
void
write_plist(package_t *pkg, FILE * fp, char *realprefix)
{
	plist_t *p;
	const cmd_t *cmdp;

	for (p = pkg->head; p; p = p->next) {
		if (p->type == PLIST_FILE) {
			/* Fast-track files - these are the most common */
			(void) fprintf(fp, "%s\n", p->name);
			continue;
		}
		for (cmdp = cmdv; cmdp->c_type != FAIL && cmdp->c_type != p->type; cmdp++) {
		}
		if (cmdp->c_type == FAIL) {
			warnx("Unknown PLIST command type %d (%s)", p->type, p->name);
		} else if (cmdp->c_argc == 0) {
			(void) fprintf(fp, "%c%s\n", CMD_CHAR, cmdp->c_s);
		} else if (cmdp->c_subst && realprefix) {
			(void) fprintf(fp, "%c%s %s\n", CMD_CHAR, cmdp->c_s, realprefix);
		} else {
			(void) fprintf(fp, "%c%s %s\n", CMD_CHAR, cmdp->c_s,
			    (p->name) ? p->name : "");
		}
	}
}

/*
 * Like write_plist, but compute memory string.
 */
void
stringify_plist(package_t *pkg, char **real_buf, size_t *real_len,
    const char *realprefix)
{
	plist_t *p;
	const cmd_t *cmdp;
	char *buf;
	size_t len;
	int item_len;

	/* Pass One: compute output size only. */
	len = 0;

	for (p = pkg->head; p; p = p->next) {
		if (p->type == PLIST_FILE) {
			len += strlen(p->name) + 1;
			continue;
		}
		for (cmdp = cmdv; cmdp->c_type != FAIL && cmdp->c_type != p->type; cmdp++) {
		}
		if (cmdp->c_type == FAIL)
			continue;
		if (cmdp->c_argc == 0)
			len += 1 + strlen(cmdp->c_s) + 1;
		else if (cmdp->c_subst && realprefix)
			len += 1 + strlen(cmdp->c_s) + 1 + strlen(realprefix) + 1;
		else
			len += 1 + strlen(cmdp->c_s) + 1 + strlen(p->name ? p->name : "") + 1;
	}

	/* Pass Two: build actual string. */
	buf = xmalloc(len + 1);
	*real_buf = buf;
	*real_len = len;
	++len;

#define	UPDATE_LEN							\
do {									\
	if (item_len < 0 || (size_t)item_len > len)			\
		errx(2, "Size computation failed, aborted.");		\
	buf += item_len;						\
	len -= item_len;						\
} while (/* CONSTCOND */0)

	for (p = pkg->head; p; p = p->next) {
		if (p->type == PLIST_FILE) {
			/* Fast-track files - these are the most common */
			item_len = snprintf(buf, len, "%s\n", p->name);
			UPDATE_LEN;
			continue;
		}
		for (cmdp = cmdv; cmdp->c_type != FAIL && cmdp->c_type != p->type; cmdp++) {
		}
		if (cmdp->c_type == FAIL) {
			warnx("Unknown PLIST command type %d (%s)", p->type, p->name);
		} else if (cmdp->c_argc == 0) {
			item_len = snprintf(buf, len, "%c%s\n", CMD_CHAR, cmdp->c_s);
			UPDATE_LEN;
		} else if (cmdp->c_subst && realprefix) {
			item_len = snprintf(buf, len, "%c%s %s\n", CMD_CHAR, cmdp->c_s, realprefix);
			UPDATE_LEN;
		} else {
			item_len = snprintf(buf, len, "%c%s %s\n", CMD_CHAR, cmdp->c_s,
			    (p->name) ? p->name : "");
			UPDATE_LEN;
		}
	}

	if (len != 1)
		errx(2, "Size computation failed, aborted.");
}

/*
 * Delete the results of a package installation.
 *
 * This is here rather than in the pkg_delete code because pkg_add needs to
 * run it too in cases of failure.
 */
int
delete_package(Boolean ign_err, package_t *pkg, Boolean NoDeleteFiles,
    const char *destdir)
{
	plist_t *p;
	const char *last_file = "";
	int     fail = SUCCESS;
	Boolean preserve;
	char    tmp[MaxPathSize];
	char 	cmd[MaxPathSize];
	const char *prefix = NULL, *name = NULL;

	if (!pkgdb_open(ReadWrite)) {
		err(EXIT_FAILURE, "cannot open pkgdb");
	}

	preserve = find_plist_option(pkg, "preserve") ? TRUE : FALSE;

	for (p = pkg->head; p; p = p->next) {
		switch (p->type) {
		case PLIST_NAME:
			name = p->name;
			break;
		case PLIST_CWD:
			if (prefix == NULL)
				prefix = p->name;
			break;
		default:
			break;
		}
	}

	if (name == NULL || prefix == NULL)
		errx(EXIT_FAILURE, "broken PLIST");

	/*
	 * Remove database entries first, directory removal is done
	 * in the main loop below.
	 */
	for (p = pkg->head; p; p = p->next) {
		if (p->type == PLIST_PKGDIR)
			delete_pkgdir(name, prefix, p->name);
	}

	for (p = pkg->head; p; p = p->next) {
		switch (p->type) {
		case PLIST_NAME:
			/* Handled already */
			break;

		case PLIST_PKGDIR:
		case PLIST_DIR_RM:
			(void) snprintf(tmp, sizeof(tmp), "%s/%s",
			    prefix, p->name);
			if (has_pkgdir(tmp))
				continue;
			(void) snprintf(tmp, sizeof(tmp), "%s%s%s/%s",
			    destdir ? destdir : "", destdir ? "/" : "",
			    prefix, p->name);
			if (!fexists(tmp)) {
				if (p->type == PLIST_PKGDIR)
					warnx("Directory `%s' disappeared, skipping", tmp);
			} else if (!isdir(tmp)) {
				warnx("attempting to delete a file `%s' as a directory\n"
				    "this packing list is incorrect - ignoring delete request", tmp);
			} else if (delete_with_parents(tmp, ign_err, TRUE))
				fail = FAIL;
			break;

		case PLIST_IGNORE:
			p = p->next;
			break;

		case PLIST_UNEXEC:
			if (NoDeleteFiles)
				break;
			(void) snprintf(tmp, sizeof(tmp), "%s%s%s",
					destdir ? destdir : "", destdir ? "/" : "", prefix);
			format_cmd(cmd, sizeof(cmd), p->name, tmp, last_file);
			printf("Executing `%s'\n", cmd);
			if (!Fake && system(cmd)) {
				warnx("unexec command for `%s' failed", cmd);
				fail = FAIL;
			}
			break;

		case PLIST_FILE:
			last_file = p->name;
			(void) snprintf(tmp, sizeof(tmp), "%s%s%s/%s",
			    destdir ? destdir : "", destdir ? "/" : "",
			    prefix, p->name);
			if (isdir(tmp)) {
				warnx("attempting to delete directory `%s' as a file\n"
				    "this packing list is incorrect - ignoring delete request", tmp);
			} else {
				int     restored = 0;	/* restored from preserve? */

				if (p->next && p->next->type == PLIST_COMMENT) {
					if (strncmp(p->next->name, CHECKSUM_HEADER, ChecksumHeaderLen) == 0) {
						char   *cp, buf[LegibleChecksumLen];

						if ((cp = MD5File(tmp, buf)) != NULL) {
							/* Mismatch? */
							if (strcmp(cp, p->next->name + ChecksumHeaderLen) != 0) {
								printf("original MD5 checksum failed, %s: %s\n",
								    Force ? "deleting anyway" : "not deleting", tmp);
								if (!Force) {
									fail = FAIL;
									goto pkgdb_cleanup;
								}
							}
						}
					} else if (strncmp(p->next->name, SYMLINK_HEADER, SymlinkHeaderLen) == 0) {
						char	buf[MaxPathSize + SymlinkHeaderLen];
						int	cc;

						(void) strlcpy(buf, SYMLINK_HEADER,
						    sizeof(buf));
						if ((cc = readlink(tmp, &buf[SymlinkHeaderLen],
							  sizeof(buf) - SymlinkHeaderLen - 1)) < 0) {
							warn("can't readlink `%s'", tmp);
							goto pkgdb_cleanup;
						}
						buf[SymlinkHeaderLen + cc] = 0x0;
						if (strcmp(buf, p->next->name) != 0) {
							if ((cc = readlink(&buf[SymlinkHeaderLen], &buf[SymlinkHeaderLen],
								  sizeof(buf) - SymlinkHeaderLen)) < 0) {
								printf("symlink %s is not same as recorded value, %s: %s\n",
								    buf, Force ? "deleting anyway" : "not deleting", tmp);
								if (!Force) {
									fail = FAIL;
									goto pkgdb_cleanup;
								}
							}
							buf[SymlinkHeaderLen + cc] = 0x0;
							if (strcmp(buf, p->next->name) != 0) {
								printf("symlink %s is not same as recorded value, %s: %s\n",
								    buf, Force ? "deleting anyway" : "not deleting", tmp);
								if (!Force) {
									fail = FAIL;
									goto pkgdb_cleanup;
								}
							}
						}
					}
				}
				if (Verbose && !NoDeleteFiles)
					printf("Delete file %s\n", tmp);
				if (!Fake && !NoDeleteFiles) {
					if (delete_with_parents(tmp, ign_err, FALSE))
						fail = FAIL;
					if (preserve && name) {
						char    tmp2[MaxPathSize];

						if (make_preserve_name(tmp2, MaxPathSize, name, tmp)) {
							if (fexists(tmp2)) {
								if (rename(tmp2, tmp))
									warn("preserve: unable to restore %s as %s",
									    tmp2, tmp);
								else
									restored = 1;
							}
						}
					}
				}

pkgdb_cleanup:
				if (!Fake) {
					if (!restored) {
						errno = 0;
						if (pkgdb_remove(tmp) && errno)
							perror("pkgdb_remove");
					}
				}
			}
			break;
		default:
			break;
		}
	}
	pkgdb_close();
	return fail;
}

/*
 * Selectively delete a hierarchy
 * Returns 1 on error, 0 else.
 */
static int
delete_with_parents(const char *fname, Boolean ign_err, Boolean ign_nonempty)
{
	char   *cp, *cp2;

	if (remove(fname)) {
		if (!ign_err && (!ign_nonempty || errno != ENOTEMPTY))
			warnx("Couldn't remove %s", fname);
		return 0;
	}
	cp = xstrdup(fname);
	while (*cp) {
		if ((cp2 = strrchr(cp, '/')) != NULL)
			*cp2 = '\0';
		if (!isemptydir(cp))
			break;
		if (has_pkgdir(cp))
			break;
		if (rmdir(cp))
			break;
	}
	free(cp);

	return 0;
}

void
add_pkgdir(const char *pkg, const char *prefix, const char *path)
{
	char *fullpath, *oldvalue, *newvalue;

	fullpath = xasprintf("%s/%s", prefix, path);
	oldvalue = pkgdb_retrieve(fullpath);
	if (oldvalue) {
		if (strncmp(oldvalue, "@pkgdir ", 8) != 0)
			errx(EXIT_FAILURE, "Internal error while processing pkgdb, run pkg_admin rebuild");
		newvalue = xasprintf("%s %s", oldvalue, pkg);
		pkgdb_remove(fullpath);
	} else {
		newvalue = xasprintf("@pkgdir %s", pkg);
	}
	pkgdb_store(fullpath, newvalue);

	free(fullpath);
	free(newvalue);
}

void
delete_pkgdir(const char *pkg, const char *prefix, const char *path)
{
	size_t pkg_len, len;
	char *fullpath, *oldvalue, *newvalue, *iter;

	fullpath = xasprintf("%s/%s", prefix, path);
	oldvalue = pkgdb_retrieve(fullpath);
	if (oldvalue && strncmp(oldvalue, "@pkgdir ", 8) == 0) {
		newvalue = xstrdup(oldvalue);
		iter = newvalue + 8;
		pkg_len = strlen(pkg);
		while (*iter) {
			if (strncmp(iter, pkg, pkg_len) == 0 &&
			    (iter[pkg_len] == ' ' || iter[pkg_len] == '\0')) {
				len = strlen(iter + pkg_len);
				memmove(iter, iter + pkg_len + 1, len);
				if (len == 0)
					*iter = '\0';
			} else {
				iter += strcspn(iter, " ");
				iter += strspn(iter, " ");
			}
		}
		pkgdb_remove(fullpath);
		if (iter != newvalue + 8)
			pkgdb_store(fullpath, newvalue);
		free(newvalue);
	}
	free(fullpath);
}

int
has_pkgdir(const char *path)
{
	const char *value;

	value = pkgdb_retrieve(path);

	if (value && strncmp(value, "@pkgdir ", 8) == 0)
		return 1;
	else
		return 0;
}