From patchwork Thu Sep 24 09:22:24 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Paolo Bonzini X-Patchwork-Id: 304554 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-11.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 74380C2D0E2 for ; Thu, 24 Sep 2020 09:47:59 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id ED8872396E for ; Thu, 24 Sep 2020 09:47:58 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="DpnpFlue" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org ED8872396E Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:54434 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kLNr3-0000VO-Tb for qemu-devel@archiver.kernel.org; Thu, 24 Sep 2020 05:47:57 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:39012) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kLNTo-00017t-Jk for qemu-devel@nongnu.org; Thu, 24 Sep 2020 05:23:56 -0400 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:45376) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1kLNTl-00064K-PB for qemu-devel@nongnu.org; Thu, 24 Sep 2020 05:23:56 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1600939432; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=QP/tfe6eEhE2lmX3KaDtFebzNyOg1zq1GEHNjimZdqQ=; b=DpnpFlueqIl+V3ArQV2Dp9zIBfjLLFlxh5Hhzy3l2YXqzg6TD+o2ZCWNgwx1B9bDU0rU8c pSqfeNKAN+98bYqQT7QfE+ZokXkNoTnr67yN2iZnujeWH7trcVjKJyqvciPh7+SCQDNIbx Z1YSGOjeEYDBFr7cjxYU+bxrUBH4Plw= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-571-nH3JdTfeNeGNA95BQkxk3g-1; Thu, 24 Sep 2020 05:23:51 -0400 X-MC-Unique: nH3JdTfeNeGNA95BQkxk3g-1 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 3135F85B686 for ; Thu, 24 Sep 2020 09:23:50 +0000 (UTC) Received: from virtlab701.virt.lab.eng.bos.redhat.com (virtlab701.virt.lab.eng.bos.redhat.com [10.19.152.228]) by smtp.corp.redhat.com (Postfix) with ESMTP id F2B5660C15 for ; Thu, 24 Sep 2020 09:23:49 +0000 (UTC) From: Paolo Bonzini To: qemu-devel@nongnu.org Subject: [PULL 42/92] cutils: introduce get_relocated_path Date: Thu, 24 Sep 2020 05:22:24 -0400 Message-Id: <20200924092314.1722645-43-pbonzini@redhat.com> In-Reply-To: <20200924092314.1722645-1-pbonzini@redhat.com> References: <20200924092314.1722645-1-pbonzini@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=pbonzini@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Received-SPF: pass client-ip=216.205.24.124; envelope-from=pbonzini@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/09/22 23:02:20 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -32 X-Spam_score: -3.3 X-Spam_bar: --- X-Spam_report: (-3.3 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1.228, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Add the function that will compute a relocated version of the directories in CONFIG_QEMU_*DIR and CONFIG_QEMU_*PATH. Signed-off-by: Paolo Bonzini --- include/qemu/cutils.h | 12 +++++++++ meson.build | 4 +-- util/cutils.c | 61 +++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 75 insertions(+), 2 deletions(-) diff --git a/include/qemu/cutils.h b/include/qemu/cutils.h index eb59852dfd..3a86ec0321 100644 --- a/include/qemu/cutils.h +++ b/include/qemu/cutils.h @@ -184,4 +184,16 @@ int uleb128_decode_small(const uint8_t *in, uint32_t *n); */ int qemu_pstrcmp0(const char **str1, const char **str2); + +/** + * get_relocated_path: + * @dir: the directory (typically a `CONFIG_*DIR` variable) to be relocated. + * + * Returns a path for @dir that uses the directory of the running executable + * as the prefix. For example, if `bindir` is `/usr/bin` and @dir is + * `/usr/share/qemu`, the function will append `../share/qemu` to the + * directory that contains the running executable and return the result. + */ +char *get_relocated_path(const char *dir); + #endif diff --git a/meson.build b/meson.build index 9a4ade7f98..ace15dc8c0 100644 --- a/meson.build +++ b/meson.build @@ -560,9 +560,9 @@ config_host_data.set('QEMU_VERSION_MINOR', meson.project_version().split('.')[1] config_host_data.set('QEMU_VERSION_MICRO', meson.project_version().split('.')[2]) arrays = ['CONFIG_AUDIO_DRIVERS', 'CONFIG_BDRV_RW_WHITELIST', 'CONFIG_BDRV_RO_WHITELIST'] -strings = ['HOST_DSOSUF', 'CONFIG_IASL', 'bindir', 'qemu_confdir', 'qemu_datadir', +strings = ['HOST_DSOSUF', 'CONFIG_IASL', 'bindir', 'prefix', 'qemu_confdir', 'qemu_datadir', 'qemu_moddir', 'qemu_localstatedir', 'qemu_helperdir', 'qemu_localedir', - 'qemu_icondir', 'qemu_desktopdir', 'qemu_firmwarepath'] + 'qemu_icondir', 'qemu_desktopdir', 'qemu_firmwarepath', 'sysconfdir'] foreach k, v: config_host if arrays.contains(k) if v != '' diff --git a/util/cutils.c b/util/cutils.c index 36ce712271..8da34e04b0 100644 --- a/util/cutils.c +++ b/util/cutils.c @@ -889,3 +889,64 @@ int qemu_pstrcmp0(const char **str1, const char **str2) { return g_strcmp0(*str1, *str2); } + +static inline bool starts_with_prefix(const char *dir) +{ + size_t prefix_len = strlen(CONFIG_PREFIX); + return !memcmp(dir, CONFIG_PREFIX, prefix_len) && + (!dir[prefix_len] || G_IS_DIR_SEPARATOR(dir[prefix_len])); +} + +/* Return the next path component in dir, and store its length in *p_len. */ +static inline const char *next_component(const char *dir, int *p_len) +{ + int len; + while (*dir && G_IS_DIR_SEPARATOR(*dir)) { + dir++; + } + len = 0; + while (dir[len] && !G_IS_DIR_SEPARATOR(dir[len])) { + len++; + } + *p_len = len; + return dir; +} + +char *get_relocated_path(const char *dir) +{ + size_t prefix_len = strlen(CONFIG_PREFIX); + const char *bindir = CONFIG_BINDIR; + const char *exec_dir = qemu_get_exec_dir(); + GString *result; + int len_dir, len_bindir; + + /* Fail if qemu_init_exec_dir was not called. */ + assert(exec_dir[0]); + if (!starts_with_prefix(dir) || !starts_with_prefix(bindir)) { + return strdup(dir); + } + + result = g_string_new(exec_dir); + + /* Advance over common components. */ + len_dir = len_bindir = prefix_len; + do { + dir += len_dir; + bindir += len_bindir; + dir = next_component(dir, &len_dir); + bindir = next_component(bindir, &len_bindir); + } while (len_dir == len_bindir && !memcmp(dir, bindir, len_dir)); + + /* Ascend from bindir to the common prefix with dir. */ + while (len_bindir) { + bindir += len_bindir; + g_string_append(result, "/.."); + bindir = next_component(bindir, &len_bindir); + } + + if (*dir) { + assert(G_IS_DIR_SEPARATOR(dir[-1])); + g_string_append(result, dir - 1); + } + return result->str; +}