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From 037e340e348af57468920caee842bfb73aa03a3a Mon Sep 17 00:00:00 2001
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From: Pino Toscano <ptoscano@redhat.com>
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Date: Tue, 2 Aug 2016 18:45:34 +0200
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Subject: [PATCH] mllib: check for executable existance in run_command
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(RHBZ#1362357)
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run_command uses Unix.create_process which forks a child process, and
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executes execve: the latter fails when the executable does not exist,
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triggering the exit which, in older OCaml versions [1], also runs the
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at_exit handlers.
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Since there is not much that can be done to avoid this on the OCaml
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side, to keep run_command working also in older OCaml version then
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manually search for the existance of the given executable, exiting with
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code 127 (as a shell does) in this case.
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[1] http://caml.inria.fr/mantis/view.php?id=7209
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(cherry picked from commit 2cb053d3fea709b1f72681f1c556c5623c8f6fa7)
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---
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mllib/common_utils.ml | 32 ++++++++++++++++++++------------
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1 file changed, 20 insertions(+), 12 deletions(-)
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diff --git a/mllib/common_utils.ml b/mllib/common_utils.ml
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index 7e44029..51449ad 100644
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--- a/mllib/common_utils.ml
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+++ b/mllib/common_utils.ml
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@@ -707,18 +707,26 @@ let external_command ?(echo_cmd = true) cmd =
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let run_command ?(echo_cmd = true) args =
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if echo_cmd then
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debug "%s" (stringify_args args);
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- let pid =
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- Unix.create_process (List.hd args) (Array.of_list args) Unix.stdin
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- Unix.stdout Unix.stderr in
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- let _, stat = Unix.waitpid [] pid in
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- match stat with
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- | Unix.WEXITED i -> i
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- | Unix.WSIGNALED i ->
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- error (f_"external command '%s' killed by signal %d")
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- (stringify_args args) i
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- | Unix.WSTOPPED i ->
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- error (f_"external command '%s' stopped by signal %d")
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- (stringify_args args) i
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+ let app = List.hd args in
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+ try
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+ let app =
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+ if Filename.is_relative app then which app
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+ else (Unix.access app [Unix.X_OK]; app) in
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+ let pid =
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+ Unix.create_process app (Array.of_list args) Unix.stdin
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+ Unix.stdout Unix.stderr in
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+ let _, stat = Unix.waitpid [] pid in
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+ match stat with
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+ | Unix.WEXITED i -> i
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+ | Unix.WSIGNALED i ->
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+ error (f_"external command '%s' killed by signal %d")
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+ (stringify_args args) i
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+ | Unix.WSTOPPED i ->
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+ error (f_"external command '%s' stopped by signal %d")
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+ (stringify_args args) i
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+ with
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+ | Executable_not_found tool -> 127
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+ | Unix.Unix_error (errcode, _, _) when errcode = Unix.ENOENT -> 127
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let shell_command ?(echo_cmd = true) cmd =
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if echo_cmd then
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--
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1.8.3.1
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