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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-09 13:34:27 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-09 13:34:27 +0000
commit4dbdc42d9e7c3968ff7f690d00680419c9b8cb0f (patch)
tree47c1d492e9c956c1cd2b74dbd3b9d8b0db44dc4e /common-main.c
parentInitial commit. (diff)
downloadgit-4dbdc42d9e7c3968ff7f690d00680419c9b8cb0f.tar.xz
git-4dbdc42d9e7c3968ff7f690d00680419c9b8cb0f.zip
Adding upstream version 1:2.43.0.upstream/1%2.43.0
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'common-main.c')
-rw-r--r--common-main.c90
1 files changed, 90 insertions, 0 deletions
diff --git a/common-main.c b/common-main.c
new file mode 100644
index 0000000..033778b
--- /dev/null
+++ b/common-main.c
@@ -0,0 +1,90 @@
+#include "git-compat-util.h"
+#include "exec-cmd.h"
+#include "gettext.h"
+#include "attr.h"
+#include "repository.h"
+#include "setup.h"
+#include "strbuf.h"
+#include "trace2.h"
+
+/*
+ * Many parts of Git have subprograms communicate via pipe, expect the
+ * upstream of a pipe to die with SIGPIPE when the downstream of a
+ * pipe does not need to read all that is written. Some third-party
+ * programs that ignore or block SIGPIPE for their own reason forget
+ * to restore SIGPIPE handling to the default before spawning Git and
+ * break this carefully orchestrated machinery.
+ *
+ * Restore the way SIGPIPE is handled to default, which is what we
+ * expect.
+ */
+static void restore_sigpipe_to_default(void)
+{
+ sigset_t unblock;
+
+ sigemptyset(&unblock);
+ sigaddset(&unblock, SIGPIPE);
+ sigprocmask(SIG_UNBLOCK, &unblock, NULL);
+ signal(SIGPIPE, SIG_DFL);
+}
+
+int main(int argc, const char **argv)
+{
+ int result;
+ struct strbuf tmp = STRBUF_INIT;
+
+ trace2_initialize_clock();
+
+ /*
+ * Always open file descriptors 0/1/2 to avoid clobbering files
+ * in die(). It also avoids messing up when the pipes are dup'ed
+ * onto stdin/stdout/stderr in the child processes we spawn.
+ */
+ sanitize_stdfds();
+ restore_sigpipe_to_default();
+
+ git_resolve_executable_dir(argv[0]);
+
+ setlocale(LC_CTYPE, "");
+ git_setup_gettext();
+
+ initialize_the_repository();
+
+ attr_start();
+
+ trace2_initialize();
+ 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);
+
+ /* Not exit(3), but a wrapper calling our common_exit() */
+ exit(result);
+}
+
+static void check_bug_if_BUG(void)
+{
+ if (!bug_called_must_BUG)
+ return;
+ BUG("on exit(): had bug() call(s) in this process without explicit BUG_if_bug()");
+}
+
+/* We wrap exit() to call common_exit() in git-compat-util.h */
+int common_exit(const char *file, int line, int code)
+{
+ /*
+ * For non-POSIX systems: Take the lowest 8 bits of the "code"
+ * to e.g. turn -1 into 255. On a POSIX system this is
+ * redundant, see exit(3) and wait(2), but as it doesn't harm
+ * anything there we don't need to guard this with an "ifdef".
+ */
+ code &= 0xff;
+
+ check_bug_if_BUG();
+ trace2_cmd_exit_fl(file, line, code);
+
+ return code;
+}