From: "Elijah Newren via GitGitGadget" <gitgitgadget@gmail.com>
To: git@vger.kernel.org
Cc: "Jeff King" <peff@peff.net>, "René Scharfe" <l.s.r@web.de>,
"Ævar Arnfjörð Bjarmason" <avarab@gmail.com>,
"Elijah Newren" <newren@gmail.com>,
"Glen Choo" <chooglen@google.com>,
"Philip Oakley" <philipoakley@iee.email>,
"Derrick Stolee" <stolee@gmail.com>,
"Elijah Newren" <newren@gmail.com>,
"Elijah Newren" <newren@gmail.com>
Subject: [PATCH v4 02/11] setup: introduce startup_info->original_cwd
Date: Mon, 29 Nov 2021 22:37:05 +0000 [thread overview]
Message-ID: <ca9f632bd119d6aa507976e35dc0d1b178fdeea7.1638225434.git.gitgitgadget@gmail.com> (raw)
In-Reply-To: <pull.1140.v4.git.git.1638225434.gitgitgadget@gmail.com>
From: Elijah Newren <newren@gmail.com>
Removing the current working directory causes all subsequent git
commands run from that directory to get confused and fail with a message
about being unable to read the current working directory:
$ git status
fatal: Unable to read current working directory: No such file or directory
Non-git commands likely have similar warnings or even errors, e.g.
$ bash -c 'echo hello'
shell-init: error retrieving current directory: getcwd: cannot access parent directories: No such file or directory
hello
This confuses end users, particularly since the command they get the
error from is not the one that caused the problem; the problem came from
the side-effect of some previous command.
We would like to avoid removing the current working directory of our
parent process; towards this end, introduce a new variable,
startup_info->original_cwd, that tracks the current working directory
that we inherited from our parent process. For convenience of later
comparisons, we prefer that this new variable store a path relative to
the toplevel working directory (thus much like 'prefix'), except without
the trailing slash.
Subsequent commits will make use of this new variable.
Signed-off-by: Elijah Newren <newren@gmail.com>
---
cache.h | 2 ++
common-main.c | 4 ++++
setup.c | 65 +++++++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 71 insertions(+)
diff --git a/cache.h b/cache.h
index eba12487b99..92e181ea759 100644
--- a/cache.h
+++ b/cache.h
@@ -1834,8 +1834,10 @@ void overlay_tree_on_index(struct index_state *istate,
struct startup_info {
int have_repository;
const char *prefix;
+ const char *original_cwd;
};
extern struct startup_info *startup_info;
+extern const char *tmp_original_cwd;
/* merge.c */
struct commit_list;
diff --git a/common-main.c b/common-main.c
index 71e21dd20a3..aa8d5aba5bb 100644
--- a/common-main.c
+++ b/common-main.c
@@ -26,6 +26,7 @@ static void restore_sigpipe_to_default(void)
int main(int argc, const char **argv)
{
int result;
+ struct strbuf tmp = STRBUF_INIT;
trace2_initialize_clock();
@@ -49,6 +50,9 @@ int main(int argc, const char **argv)
trace2_cmd_start(argv);
trace2_collect_process_info(TRACE2_PROCESS_INFO_STARTUP);
+ if (!strbuf_getcwd(&tmp))
+ tmp_original_cwd = strbuf_detach(&tmp, NULL);
+
result = cmd_main(argc, argv);
trace2_cmd_exit(result);
diff --git a/setup.c b/setup.c
index 347d7181ae9..af3b8c09abe 100644
--- a/setup.c
+++ b/setup.c
@@ -12,6 +12,7 @@ static int work_tree_config_is_bogus;
static struct startup_info the_startup_info;
struct startup_info *startup_info = &the_startup_info;
+const char *tmp_original_cwd;
/*
* The input parameter must contain an absolute path, and it must already be
@@ -432,6 +433,69 @@ void setup_work_tree(void)
initialized = 1;
}
+static void setup_original_cwd(void)
+{
+ struct strbuf tmp = STRBUF_INIT;
+ const char *worktree = NULL;
+ int offset = -1;
+
+ if (!tmp_original_cwd)
+ return;
+
+ /*
+ * startup_info->original_cwd points to the current working
+ * directory we inherited from our parent process, which is a
+ * directory we want to avoid removing.
+ *
+ * For convience, we would like to have the path relative to the
+ * worktree instead of an absolute path.
+ *
+ * Yes, startup_info->original_cwd is usually the same as 'prefix',
+ * but differs in two ways:
+ * - prefix has a trailing '/'
+ * - if the user passes '-C' to git, that modifies the prefix but
+ * not startup_info->original_cwd.
+ */
+
+ /* Normalize the directory */
+ strbuf_realpath(&tmp, tmp_original_cwd, 1);
+ free((char*)tmp_original_cwd);
+ tmp_original_cwd = NULL;
+ startup_info->original_cwd = strbuf_detach(&tmp, NULL);
+
+ /*
+ * Get our worktree; we only protect the current working directory
+ * if it's in the worktree.
+ */
+ worktree = get_git_work_tree();
+ if (!worktree)
+ goto no_prevention_needed;
+
+ offset = dir_inside_of(startup_info->original_cwd, worktree);
+ if (offset >= 0) {
+ /*
+ * If startup_info->original_cwd == worktree, that is already
+ * protected and we don't need original_cwd as a secondary
+ * protection measure.
+ */
+ if (!*(startup_info->original_cwd + offset))
+ goto no_prevention_needed;
+
+ /*
+ * original_cwd was inside worktree; precompose it just as
+ * we do prefix so that built up paths will match
+ */
+ startup_info->original_cwd = \
+ precompose_string_if_needed(startup_info->original_cwd
+ + offset);
+ return;
+ }
+
+no_prevention_needed:
+ free((char*)startup_info->original_cwd);
+ startup_info->original_cwd = NULL;
+}
+
static int read_worktree_config(const char *var, const char *value, void *vdata)
{
struct repository_format *data = vdata;
@@ -1330,6 +1394,7 @@ const char *setup_git_directory_gently(int *nongit_ok)
setenv(GIT_PREFIX_ENVIRONMENT, "", 1);
}
+ setup_original_cwd();
strbuf_release(&dir);
strbuf_release(&gitdir);
--
gitgitgadget
next prev parent reply other threads:[~2021-11-29 23:10 UTC|newest]
Thread overview: 163+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-21 0:46 [PATCH 0/8] Avoid removing the current working directory, even if it becomes empty Elijah Newren via GitGitGadget
2021-11-21 0:46 ` [PATCH 1/8] t2501: add various tests for removing the current working directory Elijah Newren via GitGitGadget
2021-11-21 17:57 ` Ævar Arnfjörð Bjarmason
2021-11-23 1:45 ` Elijah Newren
2021-11-23 2:19 ` Ævar Arnfjörð Bjarmason
2021-11-23 3:11 ` Elijah Newren
2021-11-25 10:04 ` Ævar Arnfjörð Bjarmason
2021-11-21 0:46 ` [PATCH 2/8] repository, setup: introduce the_cwd Elijah Newren via GitGitGadget
2021-11-21 8:00 ` Junio C Hamano
2021-11-22 22:38 ` Elijah Newren
2021-11-21 8:56 ` René Scharfe
2021-11-22 23:09 ` Elijah Newren
2021-11-21 0:46 ` [PATCH 3/8] unpack-trees: refuse to remove the current working directory Elijah Newren via GitGitGadget
2021-11-21 0:46 ` [PATCH 4/8] unpack-trees: add special cwd handling Elijah Newren via GitGitGadget
2021-11-21 0:46 ` [PATCH 5/8] symlinks: do not include current working directory in dir removal Elijah Newren via GitGitGadget
2021-11-21 8:56 ` René Scharfe
2021-11-23 0:35 ` Elijah Newren
2021-11-21 0:46 ` [PATCH 6/8] clean: do not attempt to remove current working directory Elijah Newren via GitGitGadget
2021-11-21 17:51 ` Ævar Arnfjörð Bjarmason
2021-11-23 1:28 ` Elijah Newren
2021-11-21 0:46 ` [PATCH 7/8] stash: " Elijah Newren via GitGitGadget
2021-11-21 0:47 ` [PATCH 8/8] dir: avoid removing the " Elijah Newren via GitGitGadget
2021-11-23 0:39 ` Glen Choo
2021-11-23 1:19 ` Elijah Newren
2021-11-23 18:19 ` Glen Choo
2021-11-23 19:56 ` Elijah Newren
2021-11-23 20:32 ` Glen Choo
2021-11-23 21:57 ` Junio C Hamano
2021-11-23 23:23 ` Elijah Newren
2021-11-24 5:46 ` Junio C Hamano
2021-11-23 23:13 ` Elijah Newren
2021-11-24 0:39 ` Glen Choo
2021-11-24 5:46 ` Junio C Hamano
2021-11-24 1:10 ` Ævar Arnfjörð Bjarmason
2021-11-24 4:35 ` Elijah Newren
2021-11-24 11:14 ` Ævar Arnfjörð Bjarmason
2021-11-24 14:11 ` Ævar Arnfjörð Bjarmason
2021-11-25 2:54 ` Elijah Newren
2021-11-25 11:12 ` Ævar Arnfjörð Bjarmason
2021-11-26 21:40 ` The overhead of bin-wrappers/ (was: [PATCH 8/8] dir: avoid removing the current working directory) Ævar Arnfjörð Bjarmason
2021-11-24 14:33 ` [PATCH 8/8] dir: avoid removing the current working directory Philip Oakley
2021-11-24 19:46 ` Junio C Hamano
2021-11-25 12:54 ` Philip Oakley
2021-11-25 13:51 ` Ævar Arnfjörð Bjarmason
2021-11-25 2:48 ` Elijah Newren
2021-11-24 19:43 ` Junio C Hamano
2021-11-21 8:11 ` [PATCH 0/8] Avoid removing the current working directory, even if it becomes empty Junio C Hamano
2021-11-25 8:39 ` [PATCH v2 0/9] " Elijah Newren via GitGitGadget
2021-11-25 8:39 ` [PATCH v2 1/9] t2501: add various tests for removing the current working directory Elijah Newren via GitGitGadget
2021-11-25 10:21 ` Ævar Arnfjörð Bjarmason
2021-11-25 8:39 ` [PATCH v2 2/9] setup: introduce startup_info->original_cwd Elijah Newren via GitGitGadget
2021-11-25 10:44 ` Ævar Arnfjörð Bjarmason
2021-11-26 17:55 ` Elijah Newren
2021-11-26 6:52 ` Junio C Hamano
2021-11-26 18:01 ` Elijah Newren
2021-11-29 14:05 ` Derrick Stolee
2021-11-29 17:18 ` Elijah Newren
2021-11-29 17:43 ` Derrick Stolee
2021-11-29 17:42 ` Junio C Hamano
2021-11-25 8:39 ` [PATCH v2 3/9] unpack-trees: refuse to remove startup_info->original_cwd Elijah Newren via GitGitGadget
2021-11-25 10:56 ` Ævar Arnfjörð Bjarmason
2021-11-26 18:06 ` Elijah Newren
2021-11-29 14:10 ` Derrick Stolee
2021-11-29 17:26 ` Elijah Newren
2021-11-25 8:39 ` [PATCH v2 4/9] unpack-trees: add special cwd handling Elijah Newren via GitGitGadget
2021-11-29 14:14 ` Derrick Stolee
2021-11-29 17:33 ` Elijah Newren
2021-11-25 8:39 ` [PATCH v2 5/9] symlinks: do not include startup_info->original_cwd in dir removal Elijah Newren via GitGitGadget
2021-11-25 8:39 ` [PATCH v2 6/9] clean: do not attempt to remove startup_info->original_cwd Elijah Newren via GitGitGadget
2021-11-25 8:39 ` [PATCH v2 7/9] stash: " Elijah Newren via GitGitGadget
2021-11-25 10:58 ` Ævar Arnfjörð Bjarmason
2021-11-26 18:04 ` Elijah Newren
2021-11-25 8:39 ` [PATCH v2 8/9] dir: avoid incidentally removing the original_cwd in remove_path() Elijah Newren via GitGitGadget
2021-11-25 8:39 ` [PATCH v2 9/9] dir: new flag to remove_dir_recurse() to spare the original_cwd Elijah Newren via GitGitGadget
2021-11-26 22:40 ` [PATCH v3 00/11] Avoid removing the current working directory, even if it becomes empty Elijah Newren via GitGitGadget
2021-11-26 22:40 ` [PATCH v3 01/11] t2501: add various tests for removing the current working directory Elijah Newren via GitGitGadget
2021-11-27 10:32 ` Ævar Arnfjörð Bjarmason
2021-11-27 19:16 ` Elijah Newren
2021-11-26 22:40 ` [PATCH v3 02/11] setup: introduce startup_info->original_cwd Elijah Newren via GitGitGadget
2021-11-27 10:35 ` Ævar Arnfjörð Bjarmason
2021-11-27 17:05 ` Elijah Newren
2021-11-27 10:40 ` Ævar Arnfjörð Bjarmason
2021-11-27 18:31 ` Elijah Newren
2021-11-28 18:04 ` Ævar Arnfjörð Bjarmason
2021-11-29 21:58 ` Elijah Newren
2021-11-26 22:40 ` [PATCH v3 03/11] unpack-trees: refuse to remove startup_info->original_cwd Elijah Newren via GitGitGadget
2021-11-26 22:40 ` [PATCH v3 04/11] unpack-trees: add special cwd handling Elijah Newren via GitGitGadget
2021-11-26 22:40 ` [PATCH v3 05/11] symlinks: do not include startup_info->original_cwd in dir removal Elijah Newren via GitGitGadget
2021-11-26 22:40 ` [PATCH v3 06/11] clean: do not attempt to remove startup_info->original_cwd Elijah Newren via GitGitGadget
2021-11-26 22:40 ` [PATCH v3 07/11] rebase: " Elijah Newren via GitGitGadget
2021-11-29 17:50 ` Derrick Stolee
2021-11-29 19:22 ` Elijah Newren
2021-11-29 19:42 ` Derrick Stolee
2021-11-26 22:40 ` [PATCH v3 08/11] stash: " Elijah Newren via GitGitGadget
2021-11-26 22:41 ` [PATCH v3 09/11] dir: avoid incidentally removing the original_cwd in remove_path() Elijah Newren via GitGitGadget
2021-11-26 22:41 ` [PATCH v3 10/11] dir: new flag to remove_dir_recurse() to spare the original_cwd Elijah Newren via GitGitGadget
2021-11-26 22:41 ` [PATCH v3 11/11] t2501: simplify the tests since we can now assume desired behavior Elijah Newren via GitGitGadget
2021-11-29 17:57 ` [PATCH v3 00/11] Avoid removing the current working directory, even if it becomes empty Derrick Stolee
2021-11-29 22:37 ` [PATCH v4 " Elijah Newren via GitGitGadget
2021-11-29 22:37 ` [PATCH v4 01/11] t2501: add various tests for removing the current working directory Elijah Newren via GitGitGadget
2021-11-30 6:47 ` Junio C Hamano
2021-11-30 6:53 ` Elijah Newren
2021-11-29 22:37 ` Elijah Newren via GitGitGadget [this message]
2021-11-29 22:37 ` [PATCH v4 03/11] unpack-trees: refuse to remove startup_info->original_cwd Elijah Newren via GitGitGadget
2021-11-29 22:37 ` [PATCH v4 04/11] unpack-trees: add special cwd handling Elijah Newren via GitGitGadget
2021-11-29 22:37 ` [PATCH v4 05/11] symlinks: do not include startup_info->original_cwd in dir removal Elijah Newren via GitGitGadget
2021-11-29 22:37 ` [PATCH v4 06/11] clean: do not attempt to remove startup_info->original_cwd Elijah Newren via GitGitGadget
2021-11-29 22:37 ` [PATCH v4 07/11] rebase: " Elijah Newren via GitGitGadget
2021-11-29 22:37 ` [PATCH v4 08/11] stash: " Elijah Newren via GitGitGadget
2021-11-29 22:37 ` [PATCH v4 09/11] dir: avoid incidentally removing the original_cwd in remove_path() Elijah Newren via GitGitGadget
2021-11-29 22:37 ` [PATCH v4 10/11] dir: new flag to remove_dir_recurse() to spare the original_cwd Elijah Newren via GitGitGadget
2021-11-29 22:37 ` [PATCH v4 11/11] t2501: simplify the tests since we can now assume desired behavior Elijah Newren via GitGitGadget
2021-11-29 23:38 ` [PATCH v4 00/11] Avoid removing the current working directory, even if it becomes empty Eric Sunshine
2021-11-30 0:16 ` Elijah Newren
2021-12-01 6:40 ` [PATCH v5 " Elijah Newren via GitGitGadget
2021-12-01 6:40 ` [PATCH v5 01/11] t2501: add various tests for removing the current working directory Elijah Newren via GitGitGadget
2021-12-01 6:40 ` [PATCH v5 02/11] setup: introduce startup_info->original_cwd Elijah Newren via GitGitGadget
2021-12-01 6:40 ` [PATCH v5 03/11] unpack-trees: refuse to remove startup_info->original_cwd Elijah Newren via GitGitGadget
2021-12-01 6:40 ` [PATCH v5 04/11] unpack-trees: add special cwd handling Elijah Newren via GitGitGadget
2021-12-01 6:40 ` [PATCH v5 05/11] symlinks: do not include startup_info->original_cwd in dir removal Elijah Newren via GitGitGadget
2021-12-01 6:40 ` [PATCH v5 06/11] clean: do not attempt to remove startup_info->original_cwd Elijah Newren via GitGitGadget
2021-12-01 6:40 ` [PATCH v5 07/11] rebase: " Elijah Newren via GitGitGadget
2022-01-25 20:26 ` [Bug] Rebase from worktree subdir is broken (was Re: [PATCH v5 07/11] rebase: do not attempt to remove startup_info->original_cwd) Glen Choo
2022-01-25 23:59 ` Elijah Newren
2022-01-26 0:30 ` Glen Choo
2022-01-26 19:04 ` Elijah Newren
2022-01-26 0:32 ` Eric Sunshine
2022-01-26 0:38 ` Eric Sunshine
2022-01-26 0:51 ` Elijah Newren
2022-01-26 1:15 ` Glen Choo
2022-01-26 1:38 ` Elijah Newren
2022-01-26 11:00 ` Phillip Wood
2022-01-26 17:53 ` Eric Sunshine
2022-01-27 11:01 ` Phillip Wood
2022-01-27 20:03 ` Elijah Newren
2022-02-05 11:23 ` Eric Sunshine
2022-02-05 11:42 ` Eric Sunshine
2022-02-05 22:35 ` Elijah Newren
2021-12-01 6:40 ` [PATCH v5 08/11] stash: do not attempt to remove startup_info->original_cwd Elijah Newren via GitGitGadget
2021-12-01 6:40 ` [PATCH v5 09/11] dir: avoid incidentally removing the original_cwd in remove_path() Elijah Newren via GitGitGadget
2021-12-01 6:40 ` [PATCH v5 10/11] dir: new flag to remove_dir_recurse() to spare the original_cwd Elijah Newren via GitGitGadget
2021-12-01 6:40 ` [PATCH v5 11/11] t2501: simplify the tests since we can now assume desired behavior Elijah Newren via GitGitGadget
2021-12-07 16:09 ` [PATCH v5 00/11] Avoid removing the current working directory, even if it becomes empty Derrick Stolee
2021-12-07 18:30 ` Ævar Arnfjörð Bjarmason
2021-12-07 20:57 ` Derrick Stolee
2021-12-08 10:23 ` Ævar Arnfjörð Bjarmason
2021-12-07 20:43 ` Elijah Newren
2021-12-07 21:00 ` Derrick Stolee
2021-12-09 5:08 ` [PATCH v6 " Elijah Newren via GitGitGadget
2021-12-09 5:08 ` [PATCH v6 01/11] t2501: add various tests for removing the current working directory Elijah Newren via GitGitGadget
2022-03-11 11:57 ` Ævar Arnfjörð Bjarmason
2021-12-09 5:08 ` [PATCH v6 02/11] setup: introduce startup_info->original_cwd Elijah Newren via GitGitGadget
2021-12-09 5:08 ` [PATCH v6 03/11] unpack-trees: refuse to remove startup_info->original_cwd Elijah Newren via GitGitGadget
2021-12-09 5:08 ` [PATCH v6 04/11] unpack-trees: add special cwd handling Elijah Newren via GitGitGadget
2021-12-09 5:08 ` [PATCH v6 05/11] symlinks: do not include startup_info->original_cwd in dir removal Elijah Newren via GitGitGadget
2021-12-09 5:08 ` [PATCH v6 06/11] clean: do not attempt to remove startup_info->original_cwd Elijah Newren via GitGitGadget
2021-12-09 5:08 ` [PATCH v6 07/11] rebase: " Elijah Newren via GitGitGadget
2021-12-09 5:08 ` [PATCH v6 08/11] stash: " Elijah Newren via GitGitGadget
2021-12-09 5:08 ` [PATCH v6 09/11] dir: avoid incidentally removing the original_cwd in remove_path() Elijah Newren via GitGitGadget
2021-12-09 5:08 ` [PATCH v6 10/11] dir: new flag to remove_dir_recurse() to spare the original_cwd Elijah Newren via GitGitGadget
2021-12-09 5:08 ` [PATCH v6 11/11] t2501: simplify the tests since we can now assume desired behavior Elijah Newren via GitGitGadget
2021-11-30 11:04 ` [PATCH v3 00/11] Avoid removing the current working directory, even if it becomes empty Phillip Wood
2021-12-01 0:03 ` Elijah Newren
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