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[2a01:4f8:120:2468::2]) by smtp.gmail.com with ESMTPSA id o7sm1479635wmq.36.2021.09.02.06.11.40 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 02 Sep 2021 06:11:40 -0700 (PDT) From: =?UTF-8?q?=C3=86var=20Arnfj=C3=B6r=C3=B0=20Bjarmason?= To: git@vger.kernel.org Cc: Junio C Hamano , Emily Shaffer , Jeff King , Taylor Blau , Felipe Contreras , Eric Sunshine , "brian m . carlson" , Josh Steadmon , Jonathan Tan , Derrick Stolee , =?UTF-8?q?=C3=86var=20Arnfj=C3=B6r=C3=B0=20Bjarmason?= Subject: [PATCH v5 00/36] Run hooks via "git run hook" & hook library Date: Thu, 2 Sep 2021 15:11:00 +0200 Message-Id: X-Mailer: git-send-email 2.33.0.816.g1ba32acadee In-Reply-To: References: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: git@vger.kernel.org This topic refactors our hook execution to use a new hook.[ch] API and rew "git hook run" tool in the case of the Perl & Python scripts that execute hooks. It should contain no functional changes in how hooks are run. It's mainly authored by Emily Schaffer & is followed-up by her series to make hooks configurable via normal "git config": [1] See [2] for the v4 of this. A range-diff follows, but some of the main changes: * The part where we die() if we're asked about a hook not listed in githooks(5) is gone. This makes things in Emily's follow-on topic much easier. * Various whitespace/small refactoring changes designed to make Emily's follow-on topic smaller. * Changed "/*" to "/**" comments in hook.h as appropriate (API comments). * I also re-arranged some functions in the header file to make those API comments easier to follow. I.e. we start with structs, and then various functions grouped by their respective functionality. * Various small commit message / comment rewording etc., some in response to Emily's feedback, others that I found myself. [The rest here is a summary of how this topic interacts with a re-roll of Emily's topic coming after this, feel free to skip it if only reading this topic]: I have my own version of Emily's series rebased on top of this with some significant changes / fixes, which I mainly rebased/hacked up to validate that all the changes here made sense. That version is an extensive edit not of her v3 (which I believe maps to her own 30ffe98601e) but the cf1f8e34a34 tip I found at the tip of her "config-based-hooks-restart" a couple of days ago)[3], which already incorporated some of my own feedback. That version is at my avar-nasamuffin/config-based-hooks-restart-3[4]. Emily: You should be able to run something like this to get a sensible range-diff of it v.s. what you have now (probably with s/nasamuffin/origin/): git range-diff \ gitster/ab/config-based-hooks-base..nasamuffin/config-based-hooks-restart \ avar/es-avar/config-based-hooks-6..avar/avar-nasamuffin/config-based-hooks-restart-3 There's a few miscellaneous fixes in there, e.g. it passes all commits with SANITIZE=leak now, and the "hook: allow running non-native hooks" commit is entirely gone except for the doc change, as it wasn't needed with the changes I've made in this v5 (we'd already allow running non-native hooks). Likewise all the fn() and fn_gently() function split wasn't needed anymore, as it's all "gentle" now. It has a trivial CI failure[6] (coccinelle nitpick), but other than that passes all tests. 1. https://lore.kernel.org/git/20210819033450.3382652-1-emilyshaffer@google.com/ 2. https://lore.kernel.org/git/cover-v4-00.36-00000000000-20210803T191505Z-avarab@gmail.com/ 3. https://github.com/nasamuffin/git/tree/config-based-hooks-restart 4. https://github.com/avar/git/tree/avar-nasamuffin/config-based-hooks-restart-3 5. https://github.com/avar/git/runs/3493829211 6. https://github.com/avar/git/runs/3493829211 Emily Shaffer (26): hook.c: add a hook_exists() wrapper and use it in bugreport.c hook: add 'run' subcommand gc: use hook library for pre-auto-gc hook rebase: convert pre-rebase to use hook.h am: convert applypatch to use hook.h hooks: convert 'post-checkout' hook to hook library merge: convert post-merge to use hook.h send-email: use 'git hook run' for 'sendemail-validate' git-p4: use 'git hook' to run hooks commit: convert {pre-commit,prepare-commit-msg} hook to hook.h read-cache: convert post-index-change to use hook.h receive-pack: convert push-to-checkout hook to hook.h run-command: remove old run_hook_{le,ve}() hook API run-command: allow stdin for run_processes_parallel hook: support passing stdin to hooks am: convert 'post-rewrite' hook to hook.h run-command: add stdin callback for parallelization hook: provide stdin by string_list or callback hook: convert 'post-rewrite' hook in sequencer.c to hook.h transport: convert pre-push hook to hook.h reference-transaction: use hook.h to run hooks run-command: allow capturing of collated output hooks: allow callers to capture output receive-pack: convert 'update' hook to hook.h post-update: use hook.h library receive-pack: convert receive hooks to hook.h Ævar Arnfjörð Bjarmason (10): Makefile: mark "check" target as .PHONY Makefile: stop hardcoding {command,config}-list.h Makefile: remove an out-of-date comment hook.[ch]: move find_hook() from run-command.c to hook.c hook.c users: use "hook_exists()" instead of "find_hook()" hook-list.h: add a generated list of hooks, like config-list.h git hook run: add an --ignore-missing flag hook tests: test for exact "pre-push" hook input hook tests: use a modern style for "pre-push" tests hooks: fix a TOCTOU in "did we run a hook?" heuristic .gitignore | 2 + Documentation/git-hook.txt | 51 +++++ Documentation/githooks.txt | 4 + Makefile | 26 ++- builtin.h | 1 + builtin/am.c | 29 +-- builtin/bugreport.c | 46 +---- builtin/checkout.c | 14 +- builtin/clone.c | 6 +- builtin/commit.c | 19 +- builtin/fetch.c | 1 + builtin/gc.c | 3 +- builtin/hook.c | 98 ++++++++++ builtin/merge.c | 21 +- builtin/rebase.c | 6 +- builtin/receive-pack.c | 285 +++++++++++++--------------- builtin/submodule--helper.c | 2 +- builtin/worktree.c | 29 ++- command-list.txt | 1 + commit.c | 16 +- commit.h | 3 +- compat/vcbuild/README | 2 +- config.mak.uname | 6 +- contrib/buildsystems/CMakeLists.txt | 7 + generate-hooklist.sh | 18 ++ git-p4.py | 72 +------ git-send-email.perl | 20 +- git.c | 1 + hook.c | 219 +++++++++++++++++++++ hook.h | 127 +++++++++++++ read-cache.c | 11 +- refs.c | 41 ++-- reset.c | 14 +- run-command.c | 157 +++++++-------- run-command.h | 55 +++--- sequencer.c | 86 ++++----- submodule.c | 1 + t/helper/test-run-command.c | 46 ++++- t/t0061-run-command.sh | 37 ++++ t/t1800-hook.sh | 151 +++++++++++++++ t/t5571-pre-push-hook.sh | 94 +++++---- t/t9001-send-email.sh | 4 +- transport.c | 57 ++---- 43 files changed, 1278 insertions(+), 611 deletions(-) create mode 100644 Documentation/git-hook.txt create mode 100644 builtin/hook.c create mode 100755 generate-hooklist.sh create mode 100644 hook.c create mode 100644 hook.h create mode 100755 t/t1800-hook.sh Range-diff against v4: 1: 81fe1ed90d5 = 1: ac419613fdc Makefile: mark "check" target as .PHONY 2: 0f749530777 ! 2: a161b7f0a5c Makefile: stop hardcoding {command,config}-list.h @@ Commit message this refactoring we'll only need to add the new file to the GENERATED_H variable, not EXCEPT_HDRS, the vcbuild/README etc. - I have not tested the Windows-specific change in config.mak.uname - being made here, but we use other variables from the Makefile in the - same block, and the GENERATED_H is fully defined before we include - config.mak.uname. - Hardcoding command-list.h there seems to have been a case of copy/paste programming in 976aaedca0 (msvc: add a Makefile target to pre-generate the Visual Studio solution, 2019-07-29). The 3: 644b31fe281 = 3: ffef1d3257e Makefile: remove an out-of-date comment 4: 89c4d44b0c3 ! 4: 545e16c6f04 hook.[ch]: move find_hook() to this new library @@ Metadata Author: Ævar Arnfjörð Bjarmason ## Commit message ## - hook.[ch]: move find_hook() to this new library + hook.[ch]: move find_hook() from run-command.c to hook.c Move the find_hook() function from run-command.c to a new hook.c library. This change establishes a stub library that's pretty @@ hook.h (new) +#ifndef HOOK_H +#define HOOK_H + -+/* ++/** + * Returns the path to the hook file, or NULL if the hook is missing + * or disabled. Note that this points to static storage that will be -+ * overwritten by further calls to find_hook and run_hook_*. ++ * overwritten by further calls to find_hook(). + */ +const char *find_hook(const char *name); + 5: 3514e0c0251 ! 5: a9bc4519e9a hook.c: add a hook_exists() wrapper and use it in bugreport.c @@ hook.h */ const char *find_hook(const char *name); -+/* ++/** + * A boolean version of find_hook() + */ +int hook_exists(const char *hookname); 6: d5ef40f77dc ! 6: e99ec2e6f8f hook.c users: use "hook_exists()" insted of "find_hook()" @@ Metadata Author: Ævar Arnfjörð Bjarmason ## Commit message ## - hook.c users: use "hook_exists()" insted of "find_hook()" + hook.c users: use "hook_exists()" instead of "find_hook()" Use the new hook_exists() function instead of find_hook() where the latter was called in boolean contexts. This make subsequent changes in 7: 4cfd72722c1 ! 7: 2ffb2332c8a hook-list.h: add a generated list of hooks, like config-list.h @@ Commit message hook-list.h: add a generated list of hooks, like config-list.h Make githooks(5) the source of truth for what hooks git supports, and - die hooks we don't know about in find_hook(). This ensures that the - documentation and the C code's idea about existing hooks doesn't - diverge. + punt out early on hooks we don't know about in find_hook(). This + ensures that the documentation and the C code's idea about existing + hooks doesn't diverge. We still have Perl and Python code running its own hooks, but that'll be addressed by Emily Shaffer's upcoming "git hook run" command. @@ Commit message listing only knowing about 1/4 of the p4 hooks. It didn't know about the recent "reference-transaction" hook either. + We could make the find_hook() function die() or BUG() out if the new + known_hook() returned 0, but let's make it return NULL just as it does + when it can't find a hook of a known type. Making it die() is overly + anal, and unlikely to be what we need in catching stupid typos in the + name of some new hook hardcoded in git.git's sources. By making this + be tolerant of unknown hook names, changes in a later series to make + "git hook run" run arbitrary user-configured hook names will be easier + to implement. + I have not been able to directly test the CMake change being made here. Since 4c2c38e800 (ci: modification of main.yml to use cmake for vs-build job, 2020-06-26) some of the Windows CI has a hard dependency @@ generate-hooklist.sh (new) + NULL, +}; +EOF - - ## hook.c ## -@@ - #include "cache.h" - #include "hook.h" - #include "run-command.h" -+#include "hook-list.h" -+ -+static int known_hook(const char *name) -+{ -+ const char **p; -+ size_t len = strlen(name); -+ for (p = hook_name_list; *p; p++) { -+ const char *hook = *p; -+ -+ if (!strncmp(name, hook, len) && hook[len] == '\0') -+ return 1; -+ } -+ -+ return 0; -+} - - const char *find_hook(const char *name) - { - static struct strbuf path = STRBUF_INIT; - -+ if (!known_hook(name)) -+ die(_("the hook '%s' is not known to git, should be in hook-list.h via githooks(5)"), -+ name); -+ - strbuf_reset(&path); - strbuf_git_path(&path, "hooks/%s", name); - if (access(path.buf, X_OK) < 0) { 8: 7cb4a4cb69e ! 8: 72dd1010f5b hook: add 'run' subcommand @@ builtin/hook.c (new) + /* Need to take into account core.hooksPath */ + git_config(git_default_config, NULL); + ++ /* ++ * We are not using a plain run_hooks() because we'd like to ++ * detect missing hooks. Let's find it ourselves and call ++ * run_hooks() instead. ++ */ + hook_name = argv[0]; + hook_path = find_hook(hook_name); + if (!hook_path) { @@ git.c: static struct cmd_struct commands[] = { ## hook.c ## @@ + #include "cache.h" #include "hook.h" #include "run-command.h" - #include "hook-list.h" +#include "config.h" - static int known_hook(const char *name) + const char *find_hook(const char *name) { - const char **p; - size_t len = strlen(name); -+ static int test_hooks_ok = -1; -+ - for (p = hook_name_list; *p; p++) { - const char *hook = *p; - -@@ hook.c: static int known_hook(const char *name) - return 1; - } - -+ if (test_hooks_ok == -1) -+ test_hooks_ok = git_env_bool("GIT_TEST_FAKE_HOOKS", 0); -+ -+ if (test_hooks_ok && -+ (!strcmp(name, "test-hook") || -+ !strcmp(name, "does-not-exist"))) -+ return 1; -+ - return 0; - } - @@ hook.c: int hook_exists(const char *name) { return !!find_hook(name); @@ hook.h @@ #ifndef HOOK_H #define HOOK_H -+#include "strbuf.h" +#include "strvec.h" -+#include "run-command.h" - - /* - * Returns the path to the hook file, or NULL if the hook is missing -@@ hook.h: const char *find_hook(const char *name); - */ - int hook_exists(const char *hookname); - ++ +struct hook { + /* The path to the hook */ + const char *hook_path; @@ hook.h: const char *find_hook(const char *name); + .args = STRVEC_INIT, \ +} + -+/* -+ * Callback provided to feed_pipe_fn and consume_sideband_fn. -+ */ +struct hook_cb_data { + /* rc reflects the cumulative failure state */ + int rc; @@ hook.h: const char *find_hook(const char *name); + struct hook *run_me; + struct run_hooks_opt *options; +}; -+ + + /** + * Returns the path to the hook file, or NULL if the hook is missing +@@ hook.h: const char *find_hook(const char *name); + */ + int hook_exists(const char *hookname); + ++/** ++ * Clear data from an initialized "struct run_hooks-opt". ++ */ +void run_hooks_opt_clear(struct run_hooks_opt *o); + +/** @@ hook.h: const char *find_hook(const char *name); ## t/t1800-hook.sh (new) ## @@ -+#!/bin/bash ++#!/bin/sh + +test_description='git-hook command' + @@ t/t1800-hook.sh (new) + grep "unknown option" err +' + -+test_expect_success 'setup GIT_TEST_FAKE_HOOKS=true to permit "test-hook" and "does-not-exist" names"' ' -+ GIT_TEST_FAKE_HOOKS=true && -+ export GIT_TEST_FAKE_HOOKS -+' -+ +test_expect_success 'git hook run: nonexistent hook' ' + cat >stderr.expect <<-\EOF && + error: cannot find a hook named test-hook 9: 2b8500aa675 ! 9: 821cc9bf11e gc: use hook library for pre-auto-gc hook @@ hook.c: int run_hooks(const char *hook_name, const char *hook_path, + } + + ret = run_hooks(hook_name, hook_path, options); ++ +cleanup: + run_hooks_opt_clear(options); ++ + return ret; +} @@ hook.h: void run_hooks_opt_clear(struct run_hooks_opt *o); + * with run_hooks(). + * + * If "options" is provided calls run_hooks_opt_clear() on it for -+ * you. If "options" is NULL a scratch one will be provided for you -+ * before calling run_hooks(). ++ * you. If "options" is NULL the default options from ++ * RUN_HOOKS_OPT_INIT will be used. + */ +int run_hooks_oneshot(const char *hook_name, struct run_hooks_opt *options); + 10: 3ee55d2c10f = 10: d71c90254ea rebase: convert pre-rebase to use hook.h 11: 050f20d14f0 = 11: ea3af2ccc4d am: convert applypatch to use hook.h 12: ac875d284da ! 12: fed0b52f88f hooks: convert 'post-checkout' hook to hook library @@ hook.h: struct run_hooks_opt /* Args to be passed to each hook */ struct strvec args; + -+ /* Resolve and run the "absolute_path(hook)" instead of ++ /* ++ * Resolve and run the "absolute_path(hook)" instead of + * "hook". Used for "git worktree" hooks + */ + int absolute_path; 13: 69763bc2255 = 13: 53d8721a0e3 merge: convert post-merge to use hook.h 14: 2ca1ca1b8e4 ! 14: d60827a2856 git hook run: add an --ignore-missing flag @@ builtin/hook.c: static int run(int argc, const char **argv, const char *prefix) }; int ret; @@ builtin/hook.c: static int run(int argc, const char **argv, const char *prefix) - git_config(git_default_config, NULL); - + /* + * We are not using a plain run_hooks() because we'd like to + * detect missing hooks. Let's find it ourselves and call +- * run_hooks() instead. ++ * run_hooks() instead... + */ hook_name = argv[0]; + if (ignore_missing) ++ /* ... act like a plain run_hooks() under --ignore-missing */ + return run_hooks_oneshot(hook_name, &opt); hook_path = find_hook(hook_name); if (!hook_path) { 15: 5b66b04bec7 = 15: d4976a0821f send-email: use 'git hook run' for 'sendemail-validate' 16: 14a37a43db2 = 16: 99f3dcd1945 git-p4: use 'git hook' to run hooks 17: ad5d0e0e7de = 17: 509761454e6 commit: convert {pre-commit,prepare-commit-msg} hook to hook.h 18: 3d3a33e2674 = 18: e2c94d95427 read-cache: convert post-index-change to use hook.h 19: 893f8666301 ! 19: fa7d0d24ea2 receive-pack: convert push-to-checkout hook to hook.h @@ Commit message Move the push-to-checkout hook away from run-command.h to and over to the new hook.h library. + This removes the last direct user of run_hook_le(), so we could remove + that function now, but let's leave that to a follow-up cleanup commit. + Signed-off-by: Emily Shaffer Signed-off-by: Ævar Arnfjörð Bjarmason 20: 070433deba5 = 20: 428bb5a6792 run-command: remove old run_hook_{le,ve}() hook API 21: 1028e0c1667 = 21: 994f6ad8602 run-command: allow stdin for run_processes_parallel 22: 639e59e9ed0 = 22: 3ccc654a664 hook: support passing stdin to hooks 23: 7d1925cca48 = 23: f548e3d15e7 am: convert 'post-rewrite' hook to hook.h 24: 0c24221b522 = 24: bb119fa7cc0 run-command: add stdin callback for parallelization 25: 05d1085f7eb ! 25: 2439f7752b8 hook: provide stdin by string_list or callback @@ hook.c: int run_hooks_oneshot(const char *hook_name, struct run_hooks_opt *optio ret = 0; ## hook.h ## -@@ hook.h: int hook_exists(const char *hookname); +@@ + #ifndef HOOK_H + #define HOOK_H ++#include "strbuf.h" + #include "strvec.h" ++#include "run-command.h" + struct hook { /* The path to the hook */ const char *hook_path; @@ hook.h: struct run_hooks_opt }; #define RUN_HOOKS_OPT_INIT { \ -@@ hook.h: struct run_hooks_opt - .args = STRVEC_INIT, \ - } +@@ hook.h: int run_hooks(const char *hookname, const char *hook_path, + */ + int run_hooks_oneshot(const char *hook_name, struct run_hooks_opt *options); -+/* ++/** + * To specify a 'struct string_list', set 'run_hooks_opt.feed_pipe_ctx' to the -+ * string_list and set 'run_hooks_opt.feed_pipe' to 'pipe_from_string_list()'. ++ * string_list and set 'run_hooks_opt.feed_pipe' to pipe_from_string_list(). + * This will pipe each string in the list to stdin, separated by newlines. (Do + * not inject your own newlines.) + */ +int pipe_from_string_list(struct strbuf *pipe, void *pp_cb, void *pp_task_cb); + - /* - * Callback provided to feed_pipe_fn and consume_sideband_fn. - */ + #endif 26: 4b7175af2e5 = 26: 48a380b3a91 hook: convert 'post-rewrite' hook in sequencer.c to hook.h 27: 3f24e056410 = 27: af6b9292aaa transport: convert pre-push hook to hook.h 28: ecf75f33233 ! 28: 957691f0b6d hook tests: test for exact "pre-push" hook input @@ Commit message Extend the tests added in ec55559f937 (push: Add support for pre-push hooks, 2013-01-13) to exhaustively test for the exact input we're - expecting. This helps a parallel series that's refactoring how the - hook is called, to e.g. make sure that we don't miss a trailing - newline. + expecting. This ensures that we e.g. don't miss a trailing newline. + + Appending to a file called "actual" is the established convention in + this test for hooks, see the rest of the tests added in + ec55559f937 (push: Add support for pre-push hooks, 2013-01-13). Let's + follow that convention here. Signed-off-by: Ævar Arnfjörð Bjarmason 29: 2c961be94b4 ! 29: 88fe2621549 hook tests: use a modern style for "pre-push" tests @@ t/t5571-pre-push-hook.sh: echo "$2" >>actual -EOF - test_expect_success 'push with hook' ' -+ cat >expected <<-EOF && ++ cat >expect <<-EOF && + parent1 + repo1 + refs/heads/main $COMMIT2 refs/heads/foreign $COMMIT1 @@ t/t5571-pre-push-hook.sh: echo "$2" >>actual + git push parent1 main:foreign && - diff expected actual -+ test_cmp expected actual ++ test_cmp expect actual ' test_expect_success 'add a branch' ' 30: 1ce456f9d9d = 30: 1d905e81779 reference-transaction: use hook.h to run hooks 31: 6e5f1f5bd3a = 31: fac56a9d8af run-command: allow capturing of collated output 32: 0b6e9c6d07a = 32: 7d185cdf9d1 hooks: allow callers to capture output 33: dcf63634338 = 33: c8150e1239f receive-pack: convert 'update' hook to hook.h 34: f352a485e59 = 34: a20ad847c14 post-update: use hook.h library 35: ceef2f3e804 = 35: 79c380be6ed receive-pack: convert receive hooks to hook.h 36: b71d7628b40 ! 36: fe056098534 hooks: fix a TOCTOU in "did we run a hook?" heuristic @@ hook.h: struct hook_cb_data { + int *invoked_hook; }; - void run_hooks_opt_clear(struct run_hooks_opt *o); + /** ## sequencer.c ## @@ sequencer.c: static int run_prepare_commit_msg_hook(struct repository *r, -- 2.33.0.816.g1ba32acadee