package_script.c

/*-
 * Copyright (c) 2012-2015 Juan Romero Pardines.
 * 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 AUTHOR ``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 AUTHOR 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 <sys/stat.h>
 
#include <errno.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
 
#include "xbps_api_impl.h"
 
 
int
xbps_pkg_exec_buffer(struct xbps_handle *xhp,
                     const void *blob,
                     const size_t blobsiz,
                     const char *pkgver,
                     const char *action,
                     bool update)
{
        int i;
        ssize_t ret;
        const char *tmpdir, *version;
        const char *shells[] = {
                "/bin/sh",
                "/bin/dash",
                "/bin/bash",
                NULL
        };
        char pkgname[XBPS_NAME_SIZE], *fpath;
        int fd, rv;
 
        assert(blob);
        assert(pkgver);
        assert(action);
 
        if (xhp->target_arch) {
                xbps_dbg_printf("%s: not executing %s "
                    "install/remove action.\n", pkgver, action);
                return 0;
        }
 
        if (strcmp(xhp->rootdir, "/") == 0) {
                tmpdir = getenv("TMPDIR");
                if (tmpdir == NULL)
                        tmpdir = P_tmpdir;
 
                fpath = xbps_xasprintf("%s/.xbps-script-XXXXXX", tmpdir);
        } else {
                fpath = strdup(".xbps-script-XXXXXX");
        }
 
        /* change cwd to rootdir to exec the script */
        if (chdir(xhp->rootdir) == -1) {
                rv = errno;
                goto out;
        }
 
        /* Create temp file to run script */
        if ((fd = mkstemp(fpath)) == -1) {
                rv = errno;
                xbps_dbg_printf("%s: mkstemp %s\n",
                    __func__, strerror(errno));
                goto out;
        }
        /* write blob to our temp fd */
        ret = write(fd, blob, blobsiz);
        if (ret == -1) {
                rv = errno;
                xbps_dbg_printf("%s: write %s\n",
                    __func__, strerror(errno));
                close(fd);
                goto out;
        }
        fchmod(fd, 0750);
#ifdef HAVE_FDATASYNC
        fdatasync(fd);
#else
        fsync(fd);
#endif
        close(fd);
 
        /* exec script */
        if (!xbps_pkg_name(pkgname, sizeof(pkgname), pkgver)) {
                abort();
        }
        version = xbps_pkg_version(pkgver);
        assert(version);
 
        // find a shell that can be used to execute the script.
        for (i = 0; shells[i] != NULL; i++) {
                if (access(shells[i], X_OK) == 0) {
                        break;
                }
        }
        if (shells[i] != NULL) {
                rv = xbps_file_exec(xhp, shells[i], fpath, action, pkgname, version,
                                update ? "yes" : "no",
                                "no", xhp->native_arch, NULL);
        } else if (access("/bin/busybox", X_OK) == 0) {
                rv = xbps_file_exec(xhp, "/bin/busybox", "sh", fpath, action, pkgname, version,
                                update ? "yes" : "no",
                                "no", xhp->native_arch, NULL);
        } else if (access("/bin/busybox.static", X_OK) == 0) {
                rv = xbps_file_exec(xhp, "/bin/busybox.static", "sh", fpath, action, pkgname, version,
                                update ? "yes" : "no",
                                "no", xhp->native_arch, NULL);
        } else {
                rv = -1;
        }
 
out:
        remove(fpath);
        free(fpath);
        return rv;
}
 
int
xbps_pkg_exec_script(struct xbps_handle *xhp,
                     xbps_dictionary_t d,
                     const char *script,
                     const char *action,
                     bool update)
{
        xbps_data_t data;
        const void *buf;
        size_t buflen;
        const char *pkgver = NULL;
        int rv;
 
        assert(xhp);
        assert(d);
        assert(script);
        assert(action);
 
        data = xbps_dictionary_get(d, script);
        if (data == NULL)
                return 0;
 
        xbps_dictionary_get_cstring_nocopy(d, "pkgver", &pkgver);
 
        buf = xbps_data_data_nocopy(data);
        buflen = xbps_data_size(data);
        rv = xbps_pkg_exec_buffer(xhp, buf, buflen, pkgver, action, update);
 
        return rv;
}