From patchwork Sat Dec 4 02:40:57 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Neeraj Singh (WINDOWS-SFS)" X-Patchwork-Id: 12656197 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 9E3E5C433FE for ; Sat, 4 Dec 2021 02:41:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1384116AbhLDCo2 (ORCPT ); Fri, 3 Dec 2021 21:44:28 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49234 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1384104AbhLDCo1 (ORCPT ); Fri, 3 Dec 2021 21:44:27 -0500 Received: from mail-wm1-x334.google.com (mail-wm1-x334.google.com [IPv6:2a00:1450:4864:20::334]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1E285C061354 for ; Fri, 3 Dec 2021 18:41:02 -0800 (PST) Received: by mail-wm1-x334.google.com with SMTP id g191-20020a1c9dc8000000b0032fbf912885so3605916wme.4 for ; Fri, 03 Dec 2021 18:41:02 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=message-id:in-reply-to:references:from:date:subject:fcc :content-transfer-encoding:mime-version:to:cc; bh=BijUdq9igvpvQWuUjbq8w/hN0u+Ytt78cQvqolqnjio=; b=I5HwCBlkkKnbhekmbgWBi4lSysRUA6kBpnjv3ZZgD+IxFCvlggCoHsa43tIaKrr1OL finrPSiYBw4OPEBWuTgO48FvVqZhDjEvt1T0xZH3gNBkVbm3rkAozKHGz5sgMyoifFWb jw8Qjqy2+Qq6Jz55rFaGr4UZFUiN0j8mnwwZyol56QblM/lv5rqthMLOHPEcSarI208j 6d05FmqTn/rRU/kKirj82KHqwSGmeAGExIsEsCohnkKLj4HNbh3XyPXPiERS5DLxRuQS WPkFMw6za4S2NSvaO68dznQLoZ34D+V5PuJBvptqYtW6zVjBKn/zgoDgjcjLcHK2mGtI ZV3g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:message-id:in-reply-to:references:from:date :subject:fcc:content-transfer-encoding:mime-version:to:cc; bh=BijUdq9igvpvQWuUjbq8w/hN0u+Ytt78cQvqolqnjio=; b=xXBDjrtJUSbAi0Gz9RoklDqw5cyngapxNZycw3rgiGGhmaB7XVfZOOwzD/mwTlBwan QE/94CvaW6G8BoK7dJm1nHEhyRV2vXFIYrpJVWKTV37IVktxjttTJkGzHYZHQ3EWyhR1 qfMXCP2kkgunDmJPgMo8p+6OAXY2ia6WTpq52DaZFm3c4DzFw5e6z+/PQelU4kEsm1Vo mcq1jWtXR9k8V7rCy3MO5DHy3JMIMbiqY8fBz6IRgggYXohbQJvrom+lIj4/Zk62qIqu cQTknxZfxLtlJ5DpYuNF6qwx9QVSqG9MsXsaJhxMUVEoswaWj2KTVrIxDAsRx5yCf4LU r9iQ== X-Gm-Message-State: AOAM533UbPNlhkeJ8TavGsUaKezog7+/okJGRsx4AnaHrsogWjnlgxYr ciYInk06w67ZTLp8Rp3mzsE4y8QlZAc= X-Google-Smtp-Source: ABdhPJytolHVqSckVnJsDZXlR5j9r5djoOWSfyMh5gQl+pvzG5zWdSdgaje7iDOyH98lN9WbY9VbwA== X-Received: by 2002:a1c:3b04:: with SMTP id i4mr20072985wma.126.1638585660351; Fri, 03 Dec 2021 18:41:00 -0800 (PST) Received: from [127.0.0.1] ([13.74.141.28]) by smtp.gmail.com with ESMTPSA id p12sm4536570wro.33.2021.12.03.18.40.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 03 Dec 2021 18:41:00 -0800 (PST) Message-Id: <4ae4303595eaa225ffece900ea21b418a1796069.1638585658.git.gitgitgadget@gmail.com> In-Reply-To: References: Date: Sat, 04 Dec 2021 02:40:57 +0000 Subject: [PATCH 1/2] tmp-objdir: new API for creating temporary writable databases Fcc: Sent MIME-Version: 1.0 To: git@vger.kernel.org Cc: "Neeraj K. Singh" , Neeraj Singh Precedence: bulk List-ID: X-Mailing-List: git@vger.kernel.org From: Neeraj Singh From: Neeraj Singh The tmp_objdir API provides the ability to create temporary object directories, but was designed with the goal of having subprocesses access these object stores, followed by the main process migrating objects from it to the main object store or just deleting it. The subprocesses would view it as their primary datastore and write to it. Here we add the tmp_objdir_replace_primary_odb function that replaces the current process's writable "main" object directory with the specified one. The previous main object directory is restored in either tmp_objdir_migrate or tmp_objdir_destroy. For the --remerge-diff usecase, add a new `will_destroy` flag in `struct object_database` to mark ephemeral object databases that do not require fsync durability. Add 'git prune' support for removing temporary object databases, and make sure that they have a name starting with tmp_ and containing an operation-specific name. Based-on-patch-by: Elijah Newren Signed-off-by: Neeraj Singh Signed-off-by: Junio C Hamano --- builtin/prune.c | 20 ++++++++++++--- builtin/receive-pack.c | 2 +- environment.c | 5 ++++ object-file.c | 44 +++++++++++++++++++++++++++++++-- object-store.h | 19 +++++++++++++++ object.c | 2 +- tmp-objdir.c | 55 +++++++++++++++++++++++++++++++++++++++--- tmp-objdir.h | 29 +++++++++++++++++++--- 8 files changed, 162 insertions(+), 14 deletions(-) diff --git a/builtin/prune.c b/builtin/prune.c index 485c9a3c56f..c2bcdc07db4 100644 --- a/builtin/prune.c +++ b/builtin/prune.c @@ -26,10 +26,22 @@ static int prune_tmp_file(const char *fullpath) return error("Could not stat '%s'", fullpath); if (st.st_mtime > expire) return 0; - if (show_only || verbose) - printf("Removing stale temporary file %s\n", fullpath); - if (!show_only) - unlink_or_warn(fullpath); + if (S_ISDIR(st.st_mode)) { + if (show_only || verbose) + printf("Removing stale temporary directory %s\n", fullpath); + if (!show_only) { + struct strbuf remove_dir_buf = STRBUF_INIT; + + strbuf_addstr(&remove_dir_buf, fullpath); + remove_dir_recursively(&remove_dir_buf, 0); + strbuf_release(&remove_dir_buf); + } + } else { + if (show_only || verbose) + printf("Removing stale temporary file %s\n", fullpath); + if (!show_only) + unlink_or_warn(fullpath); + } return 0; } diff --git a/builtin/receive-pack.c b/builtin/receive-pack.c index 49b846d9605..8815e24cde5 100644 --- a/builtin/receive-pack.c +++ b/builtin/receive-pack.c @@ -2213,7 +2213,7 @@ static const char *unpack(int err_fd, struct shallow_info *si) strvec_push(&child.args, alt_shallow_file); } - tmp_objdir = tmp_objdir_create(); + tmp_objdir = tmp_objdir_create("incoming"); if (!tmp_objdir) { if (err_fd > 0) close(err_fd); diff --git a/environment.c b/environment.c index 9da7f3c1a19..342400fcaad 100644 --- a/environment.c +++ b/environment.c @@ -17,6 +17,7 @@ #include "commit.h" #include "strvec.h" #include "object-store.h" +#include "tmp-objdir.h" #include "chdir-notify.h" #include "shallow.h" @@ -331,10 +332,14 @@ static void update_relative_gitdir(const char *name, void *data) { char *path = reparent_relative_path(old_cwd, new_cwd, get_git_dir()); + struct tmp_objdir *tmp_objdir = tmp_objdir_unapply_primary_odb(); trace_printf_key(&trace_setup_key, "setup: move $GIT_DIR to '%s'", path); + set_git_dir_1(path); + if (tmp_objdir) + tmp_objdir_reapply_primary_odb(tmp_objdir, old_cwd, new_cwd); free(path); } diff --git a/object-file.c b/object-file.c index c3d866a287e..0b6a61aeaff 100644 --- a/object-file.c +++ b/object-file.c @@ -683,6 +683,43 @@ void add_to_alternates_memory(const char *reference) '\n', NULL, 0); } +struct object_directory *set_temporary_primary_odb(const char *dir, int will_destroy) +{ + struct object_directory *new_odb; + + /* + * Make sure alternates are initialized, or else our entry may be + * overwritten when they are. + */ + prepare_alt_odb(the_repository); + + /* + * Make a new primary odb and link the old primary ODB in as an + * alternate + */ + new_odb = xcalloc(1, sizeof(*new_odb)); + new_odb->path = xstrdup(dir); + new_odb->will_destroy = will_destroy; + new_odb->next = the_repository->objects->odb; + the_repository->objects->odb = new_odb; + return new_odb->next; +} + +void restore_primary_odb(struct object_directory *restore_odb, const char *old_path) +{ + struct object_directory *cur_odb = the_repository->objects->odb; + + if (strcmp(old_path, cur_odb->path)) + BUG("expected %s as primary object store; found %s", + old_path, cur_odb->path); + + if (cur_odb->next != restore_odb) + BUG("we expect the old primary object store to be the first alternate"); + + the_repository->objects->odb = restore_odb; + free_object_directory(cur_odb); +} + /* * Compute the exact path an alternate is at and returns it. In case of * error NULL is returned and the human readable error is added to `err` @@ -1809,8 +1846,11 @@ int hash_object_file(const struct git_hash_algo *algo, const void *buf, /* Finalize a file on disk, and close it. */ static void close_loose_object(int fd) { - if (fsync_object_files) - fsync_or_die(fd, "loose object file"); + if (!the_repository->objects->odb->will_destroy) { + if (fsync_object_files) + fsync_or_die(fd, "loose object file"); + } + if (close(fd) != 0) die_errno(_("error when closing loose object file")); } diff --git a/object-store.h b/object-store.h index 952efb6a4be..cb173e69392 100644 --- a/object-store.h +++ b/object-store.h @@ -27,6 +27,11 @@ struct object_directory { uint32_t loose_objects_subdir_seen[8]; /* 256 bits */ struct oidtree *loose_objects_cache; + /* + * This object store is ephemeral, so there is no need to fsync. + */ + int will_destroy; + /* * Path to the alternative object store. If this is a relative path, * it is relative to the current working directory. @@ -58,6 +63,17 @@ void add_to_alternates_file(const char *dir); */ void add_to_alternates_memory(const char *dir); +/* + * Replace the current writable object directory with the specified temporary + * object directory; returns the former primary object directory. + */ +struct object_directory *set_temporary_primary_odb(const char *dir, int will_destroy); + +/* + * Restore a previous ODB replaced by set_temporary_main_odb. + */ +void restore_primary_odb(struct object_directory *restore_odb, const char *old_path); + /* * Populate and return the loose object cache array corresponding to the * given object ID. @@ -68,6 +84,9 @@ struct oidtree *odb_loose_cache(struct object_directory *odb, /* Empty the loose object cache for the specified object directory. */ void odb_clear_loose_cache(struct object_directory *odb); +/* Clear and free the specified object directory */ +void free_object_directory(struct object_directory *odb); + struct packed_git { struct hashmap_entry packmap_ent; struct packed_git *next; diff --git a/object.c b/object.c index 23a24e678a8..048f96a260e 100644 --- a/object.c +++ b/object.c @@ -513,7 +513,7 @@ struct raw_object_store *raw_object_store_new(void) return o; } -static void free_object_directory(struct object_directory *odb) +void free_object_directory(struct object_directory *odb) { free(odb->path); odb_clear_loose_cache(odb); diff --git a/tmp-objdir.c b/tmp-objdir.c index b8d880e3626..3d38eeab66b 100644 --- a/tmp-objdir.c +++ b/tmp-objdir.c @@ -1,5 +1,6 @@ #include "cache.h" #include "tmp-objdir.h" +#include "chdir-notify.h" #include "dir.h" #include "sigchain.h" #include "string-list.h" @@ -11,6 +12,8 @@ struct tmp_objdir { struct strbuf path; struct strvec env; + struct object_directory *prev_odb; + int will_destroy; }; /* @@ -38,6 +41,9 @@ static int tmp_objdir_destroy_1(struct tmp_objdir *t, int on_signal) if (t == the_tmp_objdir) the_tmp_objdir = NULL; + if (!on_signal && t->prev_odb) + restore_primary_odb(t->prev_odb, t->path.buf); + /* * This may use malloc via strbuf_grow(), but we should * have pre-grown t->path sufficiently so that this @@ -52,6 +58,7 @@ static int tmp_objdir_destroy_1(struct tmp_objdir *t, int on_signal) */ if (!on_signal) tmp_objdir_free(t); + return err; } @@ -121,7 +128,7 @@ static int setup_tmp_objdir(const char *root) return ret; } -struct tmp_objdir *tmp_objdir_create(void) +struct tmp_objdir *tmp_objdir_create(const char *prefix) { static int installed_handlers; struct tmp_objdir *t; @@ -129,11 +136,16 @@ struct tmp_objdir *tmp_objdir_create(void) if (the_tmp_objdir) BUG("only one tmp_objdir can be used at a time"); - t = xmalloc(sizeof(*t)); + t = xcalloc(1, sizeof(*t)); strbuf_init(&t->path, 0); strvec_init(&t->env); - strbuf_addf(&t->path, "%s/incoming-XXXXXX", get_object_directory()); + /* + * Use a string starting with tmp_ so that the builtin/prune.c code + * can recognize any stale objdirs left behind by a crash and delete + * them. + */ + strbuf_addf(&t->path, "%s/tmp_objdir-%s-XXXXXX", get_object_directory(), prefix); /* * Grow the strbuf beyond any filename we expect to be placed in it. @@ -269,6 +281,13 @@ int tmp_objdir_migrate(struct tmp_objdir *t) if (!t) return 0; + if (t->prev_odb) { + if (the_repository->objects->odb->will_destroy) + BUG("migrating an ODB that was marked for destruction"); + restore_primary_odb(t->prev_odb, t->path.buf); + t->prev_odb = NULL; + } + strbuf_addbuf(&src, &t->path); strbuf_addstr(&dst, get_object_directory()); @@ -292,3 +311,33 @@ void tmp_objdir_add_as_alternate(const struct tmp_objdir *t) { add_to_alternates_memory(t->path.buf); } + +void tmp_objdir_replace_primary_odb(struct tmp_objdir *t, int will_destroy) +{ + if (t->prev_odb) + BUG("the primary object database is already replaced"); + t->prev_odb = set_temporary_primary_odb(t->path.buf, will_destroy); + t->will_destroy = will_destroy; +} + +struct tmp_objdir *tmp_objdir_unapply_primary_odb(void) +{ + if (!the_tmp_objdir || !the_tmp_objdir->prev_odb) + return NULL; + + restore_primary_odb(the_tmp_objdir->prev_odb, the_tmp_objdir->path.buf); + the_tmp_objdir->prev_odb = NULL; + return the_tmp_objdir; +} + +void tmp_objdir_reapply_primary_odb(struct tmp_objdir *t, const char *old_cwd, + const char *new_cwd) +{ + char *path; + + path = reparent_relative_path(old_cwd, new_cwd, t->path.buf); + strbuf_reset(&t->path); + strbuf_addstr(&t->path, path); + free(path); + tmp_objdir_replace_primary_odb(t, t->will_destroy); +} diff --git a/tmp-objdir.h b/tmp-objdir.h index b1e45b4c75d..a3145051f25 100644 --- a/tmp-objdir.h +++ b/tmp-objdir.h @@ -10,7 +10,7 @@ * * Example: * - * struct tmp_objdir *t = tmp_objdir_create(); + * struct tmp_objdir *t = tmp_objdir_create("incoming"); * if (!run_command_v_opt_cd_env(cmd, 0, NULL, tmp_objdir_env(t)) && * !tmp_objdir_migrate(t)) * printf("success!\n"); @@ -22,9 +22,10 @@ struct tmp_objdir; /* - * Create a new temporary object directory; returns NULL on failure. + * Create a new temporary object directory with the specified prefix; + * returns NULL on failure. */ -struct tmp_objdir *tmp_objdir_create(void); +struct tmp_objdir *tmp_objdir_create(const char *prefix); /* * Return a list of environment strings, suitable for use with @@ -51,4 +52,26 @@ int tmp_objdir_destroy(struct tmp_objdir *); */ void tmp_objdir_add_as_alternate(const struct tmp_objdir *); +/* + * Replaces the main object store in the current process with the temporary + * object directory and makes the former main object store an alternate. + * If will_destroy is nonzero, the object directory may not be migrated. + */ +void tmp_objdir_replace_primary_odb(struct tmp_objdir *, int will_destroy); + +/* + * If the primary object database was replaced by a temporary object directory, + * restore it to its original value while keeping the directory contents around. + * Returns NULL if the primary object database was not replaced. + */ +struct tmp_objdir *tmp_objdir_unapply_primary_odb(void); + +/* + * Reapplies the former primary temporary object database, after protentially + * changing its relative path. + */ +void tmp_objdir_reapply_primary_odb(struct tmp_objdir *, const char *old_cwd, + const char *new_cwd); + + #endif /* TMP_OBJDIR_H */