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Allows selectively adding environment variables to pure shells.

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Includes documentation and test.
This commit is contained in:
Samuel Dionne-Riel 2018-08-01 21:28:49 -04:00
parent b27431b7cb
commit 438e02529d
3 changed files with 21 additions and 1 deletions
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8
doc/manual/command-ref/nix-shell.xml
View file

@ -32,6 +32,7 @@
<arg><option>--run</option> <replaceable>cmd</replaceable></arg> <arg><option>--run</option> <replaceable>cmd</replaceable></arg>
<arg><option>--exclude</option> <replaceable>regexp</replaceable></arg> <arg><option>--exclude</option> <replaceable>regexp</replaceable></arg>
<arg><option>--pure</option></arg> <arg><option>--pure</option></arg>
<arg><option>--keep</option> <replaceable>name</replaceable></arg>
<group choice='req'> <group choice='req'>
<arg choice='plain'> <arg choice='plain'>
<group choice='req'> <group choice='req'>
@ -165,6 +166,13 @@ also <xref linkend="sec-common-options" />.</phrase></para>
</listitem></varlistentry> </listitem></varlistentry>
<varlistentry><term><option>--keep</option> <replaceable>name</replaceable></term>
<listitem><para>When a <option>--pure</option> shell is started,
keep the listed environment variables.</para></listitem>
</varlistentry>
</variablelist> </variablelist>
<para>The following common options are supported:</para> <para>The following common options are supported:</para>

7
src/nix-build/nix-build.cc
View file

@ -99,6 +99,9 @@ void mainWrapped(int argc, char * * argv)
std::string outLink = "./result"; std::string outLink = "./result";
// List of environment variables kept for --pure
std::set<string> keepVars{"HOME", "USER", "LOGNAME", "DISPLAY", "PATH", "TERM", "IN_NIX_SHELL", "TZ", "PAGER", "NIX_BUILD_SHELL", "SHLVL"};
Strings args; Strings args;
for (int i = 1; i < argc; ++i) for (int i = 1; i < argc; ++i)
args.push_back(argv[i]); args.push_back(argv[i]);
@ -218,6 +221,9 @@ void mainWrapped(int argc, char * * argv)
} }
} }
else if (*arg == "--keep")
keepVars.insert(getArg(*arg, arg, end));
else if (*arg == "-") else if (*arg == "-")
readStdin = true; readStdin = true;
@ -368,7 +374,6 @@ void mainWrapped(int argc, char * * argv)
auto tmp = getEnv("TMPDIR", getEnv("XDG_RUNTIME_DIR", "/tmp")); auto tmp = getEnv("TMPDIR", getEnv("XDG_RUNTIME_DIR", "/tmp"));
if (pure) { if (pure) {
std::set<string> keepVars{"HOME", "USER", "LOGNAME", "DISPLAY", "PATH", "TERM", "IN_NIX_SHELL", "TZ", "PAGER", "NIX_BUILD_SHELL", "SHLVL"};
decltype(env) newEnv; decltype(env) newEnv;
for (auto & i : env) for (auto & i : env)
if (keepVars.count(i.first)) if (keepVars.count(i.first))

7
tests/nix-shell.sh
View file

@ -4,12 +4,19 @@ clearStore
# Test nix-shell -A # Test nix-shell -A
export IMPURE_VAR=foo export IMPURE_VAR=foo
export SELECTED_IMPURE_VAR=baz
export NIX_BUILD_SHELL=$SHELL export NIX_BUILD_SHELL=$SHELL
output=$(nix-shell --pure shell.nix -A shellDrv --run \ output=$(nix-shell --pure shell.nix -A shellDrv --run \
'echo "$IMPURE_VAR - $VAR_FROM_STDENV_SETUP - $VAR_FROM_NIX"') 'echo "$IMPURE_VAR - $VAR_FROM_STDENV_SETUP - $VAR_FROM_NIX"')
[ "$output" = " - foo - bar" ] [ "$output" = " - foo - bar" ]
# Test --keep
output=$(nix-shell --pure --keep SELECTED_IMPURE_VAR shell.nix -A shellDrv --run \
'echo "$IMPURE_VAR - $VAR_FROM_STDENV_SETUP - $VAR_FROM_NIX - $SELECTED_IMPURE_VAR"')
[ "$output" = " - foo - bar - baz" ]
# Test nix-shell on a .drv # Test nix-shell on a .drv
[[ $(nix-shell --pure $(nix-instantiate shell.nix -A shellDrv) --run \ [[ $(nix-shell --pure $(nix-instantiate shell.nix -A shellDrv) --run \
'echo "$IMPURE_VAR - $VAR_FROM_STDENV_SETUP - $VAR_FROM_NIX"') = " - foo - bar" ]] 'echo "$IMPURE_VAR - $VAR_FROM_STDENV_SETUP - $VAR_FROM_NIX"') = " - foo - bar" ]]