From patchwork Fri Sep 16 19:53:32 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eric DeCosta X-Patchwork-Id: 12978822 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4D8CDC6FA82 for ; Fri, 16 Sep 2022 19:54:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230303AbiIPTyG (ORCPT ); Fri, 16 Sep 2022 15:54:06 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44346 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229970AbiIPTxp (ORCPT ); Fri, 16 Sep 2022 15:53:45 -0400 Received: from mail-wr1-x42f.google.com (mail-wr1-x42f.google.com [IPv6:2a00:1450:4864:20::42f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 59759B775A for ; Fri, 16 Sep 2022 12:53:42 -0700 (PDT) Received: by mail-wr1-x42f.google.com with SMTP id e16so37643159wrx.7 for ; Fri, 16 Sep 2022 12:53:42 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=cc:to:mime-version:content-transfer-encoding:fcc:subject:date:from :references:in-reply-to:message-id:from:to:cc:subject:date; bh=RieE0QInLL2f3TtewJjo66wdOAFxsTbnPd6eR1ZyKCY=; b=p5jRWArMvVB8gjOvHrP72jRq4Eh4UU60n93xx5cgoj3hekwROB25ww9P262KrkWtJH QE/+a6imrU3ZoxmiO4ks8xrAdxp5d/xduUEa7gkdmco7MDPGl73T5udzW9Ngkha9ED5/ cKWLbMMv0Ati78jA8ZsJderZuhjjIVsyz5uET7zhJggz4t/NMyGXTw1xLvAPICVQQWe7 1pFDfbnDF2b9GxqkzWqI3MO9AmpPp73U4tw0+GhHWZLOULsHrhyf1tCQDDSC4qrw0kJ8 Rkc3taBt9aHPRkwH/yuXCFcPjNLDEJtqFiPxy6H+kwbvLAzdxjOx0UfewHoX1FLh1x5u aDCg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:mime-version:content-transfer-encoding:fcc:subject:date:from :references:in-reply-to:message-id:x-gm-message-state:from:to:cc :subject:date; bh=RieE0QInLL2f3TtewJjo66wdOAFxsTbnPd6eR1ZyKCY=; b=gSqQWo2Z8qaloT1kPQduQmTKUy5v+xysfh6IIqxctbnunwA0C5CFW9eNrBLeUc/bHc HNHYgXH3DMTP1fYlMuVgbb7sj1Opbz+6oXME0I3ZlXCCnbAGfNbDJ8cRHI4wy+qgPQFT jRA8VZD8ijtWKSSN3wG1UjF7Viqp9MGV/gNyk1kQCShUz4jQGckZoYHgonsgqKADq9RE UpoGRQgcDOEroDzjz+4P8qFfqTRsxymeR7vgAPM05k1jOyqME/A9J1wHp1py4lhvucS5 1iuSbpRBSu5iHBX41Tf7BC79Y1C8EPUKac+tWdoVhol//+TisyGb+H4r4jA3oBfrPmIh EV0Q== X-Gm-Message-State: ACrzQf0ZjY2uxN4q0U2eazYKgIvTYhJV2sxAiAV3A+jJIJVKIf9oE1k1 oWygt6wWqwCnTXRMFSLEpPHjFl3d9ig= X-Google-Smtp-Source: AMsMyM5J4mYAXQjB2Q0QZNFnLhuY9lOiaSwITncJnk2TEaqPkoJWURlXLAKGH6YbJ1GfMoU1kP6JCw== X-Received: by 2002:adf:d1ce:0:b0:22a:36d6:da05 with SMTP id b14-20020adfd1ce000000b0022a36d6da05mr4031753wrd.719.1663358020531; Fri, 16 Sep 2022 12:53:40 -0700 (PDT) Received: from [127.0.0.1] ([13.74.141.28]) by smtp.gmail.com with ESMTPSA id g14-20020a05600c4ece00b003a5f3f5883dsm3302527wmq.17.2022.09.16.12.53.39 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 16 Sep 2022 12:53:40 -0700 (PDT) Message-Id: <3a9fe473cf4f5f29099771883e53fd40ebe3b511.1663358014.git.gitgitgadget@gmail.com> In-Reply-To: References: Date: Fri, 16 Sep 2022 19:53:32 +0000 Subject: [PATCH v7 4/6] fsmonitor: deal with synthetic firmlinks on macOS Fcc: Sent MIME-Version: 1.0 To: git@vger.kernel.org Cc: Jeff Hostetler , Eric Sunshine , Torsten =?utf-8?q?B=C3=B6gershause?= =?utf-8?q?n?= , =?utf-8?b?w4Z2YXIgQXJuZmrDtnLDsA==?= Bjarmason , Ramsay Jones , Johannes Schindelin , Eric DeCosta , Eric DeCosta Precedence: bulk List-ID: X-Mailing-List: git@vger.kernel.org From: Eric DeCosta From: Eric DeCosta Starting with macOS 10.15 (Catalina), Apple introduced a new feature called 'firmlinks' in order to separate the boot volume into two volumes, one read-only and one writable but still present them to the user as a single volume. Along with this change, Apple removed the ability to create symlinks in the root directory and replaced them with 'synthetic firmlinks'. See 'man synthetic.conf' When FSEevents reports the path of changed files, if the path involves a synthetic firmlink, the path is reported from the point of the synthetic firmlink and not the real path. For example: Real path: /System/Volumes/Data/network/working/directory/foo.txt Synthetic firmlink: /network -> /System/Volumes/Data/network FSEvents path: /network/working/directory/foo.txt This causes the FSEvents path to not match against the worktree directory. There are several ways in which synthetic firmlinks can be created: they can be defined in /etc/synthetic.conf, the automounter can create them, and there may be other means. Simply reading /etc/synthetic.conf is insufficient. No matter what process creates synthetic firmlinks, they all get created in the root directory. Therefore, in order to deal with synthetic firmlinks, the root directory is scanned and the first possible synthetic firmink that, when resolved, is a prefix of the worktree is used to map FSEvents paths to worktree paths. Signed-off-by: Eric DeCosta --- builtin/fsmonitor--daemon.c | 8 +++ compat/fsmonitor/fsm-listen-darwin.c | 6 +- compat/fsmonitor/fsm-path-utils-darwin.c | 92 ++++++++++++++++++++++++ compat/fsmonitor/fsm-path-utils-win32.c | 17 +++++ fsmonitor--daemon.h | 3 + fsmonitor-path-utils.h | 36 ++++++++++ 6 files changed, 161 insertions(+), 1 deletion(-) diff --git a/builtin/fsmonitor--daemon.c b/builtin/fsmonitor--daemon.c index 0123fc33ed2..56fcd1c2baa 100644 --- a/builtin/fsmonitor--daemon.c +++ b/builtin/fsmonitor--daemon.c @@ -3,6 +3,7 @@ #include "parse-options.h" #include "fsmonitor.h" #include "fsmonitor-ipc.h" +#include "fsmonitor-path-utils.h" #include "compat/fsmonitor/fsm-health.h" #include "compat/fsmonitor/fsm-listen.h" #include "fsmonitor--daemon.h" @@ -1282,6 +1283,13 @@ static int fsmonitor_run_daemon(void) strbuf_addstr(&state.path_worktree_watch, absolute_path(get_git_work_tree())); state.nr_paths_watching = 1; + state.alias.alias = NULL; + state.alias.points_to = NULL; + if (fsmonitor__get_alias(state.path_worktree_watch.buf, &state.alias)) { + err = error(_("could not get worktree alias")); + goto done; + } + /* * We create and delete cookie files somewhere inside the .git * directory to help us keep sync with the file system. If diff --git a/compat/fsmonitor/fsm-listen-darwin.c b/compat/fsmonitor/fsm-listen-darwin.c index 8e208e8289e..179886bc15b 100644 --- a/compat/fsmonitor/fsm-listen-darwin.c +++ b/compat/fsmonitor/fsm-listen-darwin.c @@ -26,6 +26,7 @@ #include "fsmonitor.h" #include "fsm-listen.h" #include "fsmonitor--daemon.h" +#include "fsmonitor-path-utils.h" struct fsm_listen_data { @@ -209,7 +210,9 @@ static void fsevent_callback(ConstFSEventStreamRef streamRef, /* * On Mac, we receive an array of absolute paths. */ - path_k = paths[k]; + path_k = fsmonitor__resolve_alias(paths[k], &state->alias); + if (!path_k) + path_k = paths[k]; /* * If you want to debug FSEvents, log them to GIT_TRACE_FSMONITOR. @@ -238,6 +241,7 @@ static void fsevent_callback(ConstFSEventStreamRef streamRef, fsmonitor_force_resync(state); fsmonitor_batch__free_list(batch); string_list_clear(&cookie_list, 0); + batch = NULL; /* * We assume that any events that we received diff --git a/compat/fsmonitor/fsm-path-utils-darwin.c b/compat/fsmonitor/fsm-path-utils-darwin.c index 067cbe6990a..13807f58e95 100644 --- a/compat/fsmonitor/fsm-path-utils-darwin.c +++ b/compat/fsmonitor/fsm-path-utils-darwin.c @@ -1,5 +1,8 @@ #include "fsmonitor.h" #include "fsmonitor-path-utils.h" +#include +#include +#include #include #include @@ -38,3 +41,92 @@ int fsmonitor__is_fs_remote(const char *path) return -1; return fs.is_remote; } + +/* + * Scan the root directory for synthetic firmlinks that when resolved + * are a prefix of the path, stopping at the first one found. + * + * Some information about firmlinks and synthetic firmlinks: + * https://eclecticlight.co/2020/01/23/catalina-boot-volumes/ + * + * macOS no longer allows symlinks in the root directory; any link found + * there is therefore a synthetic firmlink. + * + * If this function gets called often, will want to cache all the firmlink + * information, but for now there is only one caller of this function. + * + * If there is more than one alias for the path, that is another + * matter altogether. + */ +int fsmonitor__get_alias(const char *path, struct alias_info *info) +{ + DIR * dir; + int read; + int retval; + struct dirent *de; + struct strbuf alias; + struct strbuf points_to; + + retval = 0; + dir = opendir("/"); + if (!dir) + return -1; + + strbuf_init(&alias, 256); + strbuf_init(&points_to, MAXPATHLEN); + + while ((de = readdir(dir)) != NULL) { + strbuf_reset(&alias); + strbuf_addch(&alias, '/'); + strbuf_add(&alias, de->d_name, strlen(de->d_name)); + + read = readlink(alias.buf, points_to.buf, MAXPATHLEN); + if (read > 0) { + strbuf_setlen(&points_to, read); + if ((strncmp(points_to.buf, path, points_to.len) == 0) + && path[points_to.len] == '/') { + info->alias = strbuf_detach(&alias, NULL); + info->points_to = strbuf_detach(&points_to, NULL); + trace_printf_key(&trace_fsmonitor, + "Found alias for '%s' : '%s' -> '%s'", + path, info->alias, info->points_to); + retval = 0; + goto done; + } + } else if (errno != EINVAL) { /* Something other than not a link */ + trace_printf_key(&trace_fsmonitor, "Error %s", strerror(errno)); + retval = -1; + goto done; + } + } + + done: + closedir(dir); + strbuf_release(&alias); + strbuf_release(&points_to); + return retval; +} + +char *fsmonitor__resolve_alias(const char *path, + const struct alias_info *info) +{ + int len = info->alias ? strlen(info->alias) : 0; + + if (!len) + return NULL; + + if ((strncmp(info->alias, path, len) == 0) + && path[len] == '/') { + struct strbuf tmp; + const char *remainder = path + len; + int ptr_len = strlen(info->points_to); + int rem_len = strlen(remainder); + + strbuf_init(&tmp, ptr_len + rem_len); + strbuf_add(&tmp, info->points_to, ptr_len); + strbuf_add(&tmp, remainder, rem_len); + return strbuf_detach(&tmp, NULL); + } + + return NULL; +} diff --git a/compat/fsmonitor/fsm-path-utils-win32.c b/compat/fsmonitor/fsm-path-utils-win32.c index a90b8f7925b..0d95bbb416f 100644 --- a/compat/fsmonitor/fsm-path-utils-win32.c +++ b/compat/fsmonitor/fsm-path-utils-win32.c @@ -126,3 +126,20 @@ int fsmonitor__is_fs_remote(const char *path) return -1; return fs.is_remote; } + +/* + * No-op for now. + */ +int fsmonitor__get_alias(const char *path, struct alias_info *info) +{ + return 0; +} + +/* + * No-op for now. + */ +char *fsmonitor__resolve_alias(const char *path, + const struct alias_info *info) +{ + return NULL; +} diff --git a/fsmonitor--daemon.h b/fsmonitor--daemon.h index 2102a5c9ff5..e24838f9a86 100644 --- a/fsmonitor--daemon.h +++ b/fsmonitor--daemon.h @@ -8,6 +8,7 @@ #include "run-command.h" #include "simple-ipc.h" #include "thread-utils.h" +#include "fsmonitor-path-utils.h" struct fsmonitor_batch; struct fsmonitor_token_data; @@ -43,6 +44,7 @@ struct fsmonitor_daemon_state { struct strbuf path_worktree_watch; struct strbuf path_gitdir_watch; + struct alias_info alias; int nr_paths_watching; struct fsmonitor_token_data *current_token_data; @@ -59,6 +61,7 @@ struct fsmonitor_daemon_state { struct ipc_server_data *ipc_server_data; struct strbuf path_ipc; + }; /* diff --git a/fsmonitor-path-utils.h b/fsmonitor-path-utils.h index e48592887e7..50ef37e57bb 100644 --- a/fsmonitor-path-utils.h +++ b/fsmonitor-path-utils.h @@ -1,6 +1,14 @@ #ifndef FSM_PATH_UTILS_H #define FSM_PATH_UTILS_H +#include "strbuf.h" + +struct alias_info +{ + char *alias; + char *points_to; +}; + struct fs_info { int is_remote; char *typename; @@ -20,4 +28,32 @@ int fsmonitor__get_fs_info(const char *path, struct fs_info *fs_info); */ int fsmonitor__is_fs_remote(const char *path); +/* + * Get the alias in given path, if any. + * + * Sets alias to the first alias that matches any part of the path. + * + * If an alias is found, info.alias and info.points_to are set to the + * found mapping. + * + * Returns -1 on error, 0 otherwise. + * + * The caller owns the storage that is occupied by set info.alias and + * info.points_to and is responsible for releasing it with `free(3)` + * when done. + */ +int fsmonitor__get_alias(const char *path, struct alias_info *info); + +/* + * Resolve the path against the given alias. + * + * Returns the resolved path if there is one, NULL otherwise. + * + * The caller owns the storage that the returned string occupies and + * is responsible for releasing it with `free(3)` when done. + */ +char *fsmonitor__resolve_alias(const char *path, + const struct alias_info *info); + + #endif