58 lines
2.3 KiB
Diff
58 lines
2.3 KiB
Diff
From 96283acb9d8fe69bb921ee84c584bc79b1eb262f Mon Sep 17 00:00:00 2001
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From: Johannes Schindelin <johannes.schindelin@gmx.de>
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Date: Tue, 6 Sep 2022 10:40:58 +0200
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Subject: [PATCH 36/N] Optionally disallow empty environment values again
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We just disabled the code that skips environment variables whose values
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are empty.
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However, this code was introduced a long time ago into Cygwin in
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d6b1ac7faa (* environ.cc (build_env): Don't put an empty environment
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variable into the environment. Optimize use of "len". * errno.cc
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(ERROR_MORE_DATA): Translate to EMSGSIZE rather than EAGAIN.,
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2006-09-07), seemingly without any complaints.
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Meaning: There might very well be use cases out there where it makes
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sense to skip empty-valued environment variables.
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Therefore, it seems like a good idea to have a "knob" to turn it back
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on. With this commit, we introduce such a knob: by setting
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`noemptyenvvalues` the `MSYS` variable (or appending it if that variable
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is already set), users can tell the MSYS2 runtime to behave just like in
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the olden times.
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Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
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---
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winsup/cygwin/environ.cc | 4 +++-
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1 file changed, 3 insertions(+), 1 deletion(-)
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diff --git a/winsup/cygwin/environ.cc b/winsup/cygwin/environ.cc
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index 522d7d5..128f34d 100644
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--- a/winsup/cygwin/environ.cc
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+++ b/winsup/cygwin/environ.cc
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@@ -36,6 +36,7 @@ static char **lastenviron;
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/* Parse CYGWIN options */
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static NO_COPY bool export_settings = false;
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+static bool emptyenvvalues = true;
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enum settings
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{
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@@ -130,6 +131,7 @@ static struct parse_thing
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{"enable_pcon", {&disable_pcon}, setnegbool, NULL, {{true}, {false}}},
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{"winjitdebug", {&winjitdebug}, setbool, NULL, {{false}, {true}}},
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{"nativeinnerlinks", {&nativeinnerlinks}, setbool, NULL, {{false}, {true}}},
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+ {"emptyenvvalues", {&emptyenvvalues}, setbool, NULL, {{false}, {true}}},
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{NULL, {0}, setdword, 0, {{0}, {0}}}
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};
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@@ -1339,7 +1341,7 @@ build_env (const char * const *envp, PWCHAR &envblock, int &envc,
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Note that this doesn't stop invalid strings without '=' in it
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etc., but we're opting for speed here for now. Adding complete
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checking would be pretty expensive. */
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- if (len == 1)
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+ if (len == 1 || (!emptyenvvalues && !*rest))
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continue;
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/* See if this entry requires posix->win32 conversion. */
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