From 4c5baf0273ae3382dbaca81fee0331cada5899ea Mon Sep 17 00:00:00 2001 From: Jonathan Nieder Date: Wed, 16 Oct 2013 16:11:46 -0700 Subject: [PATCH] gc: remove gc.pid file at end of execution MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit This file isn't really harmful, but isn't useful either, and can create minor annoyance for the user: * It's confusing, as the presence of a *.pid file often implies that a process is currently running. A user running "ls .git/" and finding this file may incorrectly guess that a "git gc" is currently running. * Leaving this file means that a "git gc" in an already gc-ed repo is no-longer a no-op. A user running "git gc" in a set of repositories, and then synchronizing this set (e.g. rsync -av, unison, ...) will see all the gc.pid files as changed, which creates useless noise. This patch unlinks the file after the garbage collection is done, so that gc.pid is actually present only during execution. Future versions of Git may want to use the information left in the gc.pid file (e.g. for policies like "don't attempt to run a gc if one has already been ran less than X hours ago"). If so, this patch can safely be reverted. For now, let's not bother the users. Explained-by: Matthieu Moy Signed-off-by: Jonathan Nieder Improved-by: Nguyễn Thái Ngọc Duy Signed-off-by: Junio C Hamano --- builtin/gc.c | 24 ++++++++++++++++++++++++ t/t6500-gc.sh | 5 +++++ 2 files changed, 29 insertions(+) diff --git a/builtin/gc.c b/builtin/gc.c index 6e0d81ab3..dd910fbc3 100644 --- a/builtin/gc.c +++ b/builtin/gc.c @@ -14,6 +14,7 @@ #include "cache.h" #include "parse-options.h" #include "run-command.h" +#include "sigchain.h" #include "argv-array.h" #define FAILED_RUN "failed to run %s" @@ -35,6 +36,21 @@ static struct argv_array repack = ARGV_ARRAY_INIT; static struct argv_array prune = ARGV_ARRAY_INIT; static struct argv_array rerere = ARGV_ARRAY_INIT; +static char *pidfile; + +static void remove_pidfile(void) +{ + if (pidfile) + unlink(pidfile); +} + +static void remove_pidfile_on_signal(int signo) +{ + remove_pidfile(); + sigchain_pop(signo); + raise(signo); +} + static int gc_config(const char *var, const char *value, void *cb) { if (!strcmp(var, "gc.packrefs")) { @@ -179,6 +195,10 @@ static const char *lock_repo_for_gc(int force, pid_t* ret_pid) FILE *fp; int fd, should_exit; + if (pidfile) + /* already locked */ + return NULL; + if (gethostname(my_host, sizeof(my_host))) strcpy(my_host, "unknown"); @@ -219,6 +239,10 @@ static const char *lock_repo_for_gc(int force, pid_t* ret_pid) strbuf_release(&sb); commit_lock_file(&lock); + pidfile = git_pathdup("gc.pid"); + sigchain_push_common(remove_pidfile_on_signal); + atexit(remove_pidfile); + return NULL; } diff --git a/t/t6500-gc.sh b/t/t6500-gc.sh index b1a63655f..63194d819 100755 --- a/t/t6500-gc.sh +++ b/t/t6500-gc.sh @@ -9,6 +9,11 @@ test_expect_success 'gc empty repository' ' git gc ' +test_expect_success 'gc does not leave behind pid file' ' + git gc && + test_path_is_missing .git/gc.pid +' + test_expect_success 'gc --gobbledegook' ' test_expect_code 129 git gc --nonsense 2>err && test_i18ngrep "[Uu]sage: git gc" err -- 2.11.0