From: Jeff Hostetler <git@jeffhostetler.com> To: Jeff King <peff@peff.net>, Johannes Schindelin <Johannes.Schindelin@gmx.de> Cc: Johannes Schindelin via GitGitGadget <gitgitgadget@gmail.com>, git@vger.kernel.org, Junio C Hamano <gitster@pobox.com> Subject: Re: [PATCH v2 1/1] config: work around bug with includeif:onbranch and early config Date: Thu, 1 Aug 2019 13:24:17 -0400 Message-ID: <7f4257d3-5ae0-3a83-84f1-bee83682fa36@jeffhostetler.com> (raw) In-Reply-To: <20190801004928.GA6351@sigill.intra.peff.net> On 7/31/2019 8:49 PM, Jeff King wrote: > On Wed, Jul 31, 2019 at 07:12:57PM -0400, Jeff King wrote: > >> Hrm. But common-main calls initialize_the_repository(), which points it >> at &the_repo. And I can't find any other assignments. So how does it >> become NULL? And is every caller of have_git_dir() at risk of >> segfaulting? >> >> Ah, I see. I think it is that trace2 reads the configuration very early. >> I think we ought to do this: >> >> diff --git a/common-main.c b/common-main.c >> index 582a7b1886..89fd415e55 100644 >> --- a/common-main.c >> +++ b/common-main.c >> @@ -39,14 +39,14 @@ int main(int argc, const char **argv) >> >> git_resolve_executable_dir(argv[0]); >> >> + initialize_the_repository(); >> + >> trace2_initialize(); >> trace2_cmd_start(argv); >> trace2_collect_process_info(TRACE2_PROCESS_INFO_STARTUP); >> >> git_setup_gettext(); >> >> - initialize_the_repository(); >> - >> attr_start(); >> >> result = cmd_main(argc, argv); > > By the way, I wondered why trace2's existing config reading did not > cause us to segfault because of this. It is because it invented the > "very early config" function which always ignores some config sources > (working around this problem, but also making it weirdly unlike most > other config). Yes, I added the "very early config" to try to work around some of the chicken-n-egg problems. I can't say that I was completely happy with having to do that. I haven't had time to play with your patch suggestion here, but I think it would be fine to do if it will help with the original problem. In [1] I added code to just start the clock in isolation (rather than being part of the trace2_initialize() -- which does all the config loading and subsystem initialization). So it is OK to let the trace2_initialize() run a little later. (Part of the reason for that split was to allow git_resolve_executable_dir() to run first, since that data was needed to find the location of the system config relative to the exe path (sigh).) [1] a089724958a trace2: refactor setting process starting time So, as you suggested in your previous response, something like this would/should be fine. $ git diff diff --git a/common-main.c b/common-main.c index 582a7b1886..71e21dd20a 100644 --- a/common-main.c +++ b/common-main.c @@ -39,16 +39,16 @@ int main(int argc, const char **argv) git_resolve_executable_dir(argv[0]); - trace2_initialize(); - trace2_cmd_start(argv); - trace2_collect_process_info(TRACE2_PROCESS_INFO_STARTUP); - git_setup_gettext(); initialize_the_repository(); attr_start(); + trace2_initialize(); + trace2_cmd_start(argv); + trace2_collect_process_info(TRACE2_PROCESS_INFO_STARTUP); + result = cmd_main(argc, argv); trace2_cmd_exit(result);
next prev parent reply other threads:[~2019-08-01 17:24 UTC|newest] Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-07-31 19:53 [PATCH 0/1] Make the includeif:onbranch feature more robust Johannes Schindelin via GitGitGadget 2019-07-31 19:53 ` [PATCH 1/1] config: work around bug with includeif:onbranch and early config Johannes Schindelin via GitGitGadget 2019-07-31 21:37 ` Junio C Hamano 2019-07-31 20:06 ` [PATCH v2 0/1] Make the includeif:onbranch feature more robust Johannes Schindelin via GitGitGadget 2019-07-31 20:06 ` [PATCH v2 1/1] config: work around bug with includeif:onbranch and early config Johannes Schindelin via GitGitGadget 2019-07-31 22:02 ` Jeff King 2019-07-31 22:13 ` Johannes Schindelin 2019-07-31 23:12 ` Jeff King 2019-08-01 0:49 ` Jeff King 2019-08-01 17:24 ` Jeff Hostetler [this message] 2019-08-06 12:26 ` [PATCH 0/3] the_repository initialization cleanup Jeff King 2019-08-06 12:26 ` [PATCH 1/3] t1309: use short branch name in includeIf.onbranch test Jeff King 2019-08-06 12:27 ` [PATCH 2/3] common-main: delay trace2 initialization Jeff King 2019-08-06 12:27 ` [PATCH 3/3] config: stop checking whether the_repository is NULL Jeff King 2019-08-06 12:49 ` Jeff King 2019-08-08 19:48 ` Johannes Schindelin 2019-08-06 12:56 ` [PATCH v2 1/1] config: work around bug with includeif:onbranch and early config Jeff King
Reply instructions: You may reply publicly to this message via plain-text email using any one of the following methods: * Save the following mbox file, import it into your mail client, and reply-to-all from there: mbox Avoid top-posting and favor interleaved quoting: https://en.wikipedia.org/wiki/Posting_style#Interleaved_style List information: http://vger.kernel.org/majordomo-info.html * Reply using the --to, --cc, and --in-reply-to switches of git-send-email(1): git send-email \ --in-reply-to=7f4257d3-5ae0-3a83-84f1-bee83682fa36@jeffhostetler.com \ --to=git@jeffhostetler.com \ --cc=Johannes.Schindelin@gmx.de \ --cc=git@vger.kernel.org \ --cc=gitgitgadget@gmail.com \ --cc=gitster@pobox.com \ --cc=peff@peff.net \ /path/to/YOUR_REPLY https://kernel.org/pub/software/scm/git/docs/git-send-email.html * If your mail client supports setting the In-Reply-To header via mailto: links, try the mailto: link
git@vger.kernel.org list mirror (unofficial, one of many) This inbox may be cloned and mirrored by anyone: git clone --mirror https://public-inbox.org/git git clone --mirror http://ou63pmih66umazou.onion/git git clone --mirror http://czquwvybam4bgbro.onion/git git clone --mirror http://hjrcffqmbrq6wope.onion/git # If you have public-inbox 1.1+ installed, you may # initialize and index your mirror using the following commands: public-inbox-init -V1 git git/ https://public-inbox.org/git \ git@vger.kernel.org public-inbox-index git Example config snippet for mirrors. Newsgroups are available over NNTP: nntp://news.public-inbox.org/inbox.comp.version-control.git nntp://ou63pmih66umazou.onion/inbox.comp.version-control.git nntp://czquwvybam4bgbro.onion/inbox.comp.version-control.git nntp://hjrcffqmbrq6wope.onion/inbox.comp.version-control.git nntp://news.gmane.io/gmane.comp.version-control.git note: .onion URLs require Tor: https://www.torproject.org/ code repositories for the project(s) associated with this inbox: https://80x24.org/mirrors/git.git AGPL code for this site: git clone https://public-inbox.org/public-inbox.git