Killing background processes started in nix-shell
I am developing a simple data science environment with Python tools and a database. When I enter the nix-shell, I spin up the database process. I would like to spin it down when exiting the environment.
How could I use trap and nix to accomplish that?
background-process trap nix nix-shell
asked Aug 22 at 11:32
dmvianna
324312
add a comment |
I am developing a simple data science environment with Python tools and a database. When I enter the nix-shell, I spin up the database process. I would like to spin it down when exiting the environment.
How could I use trap and nix to accomplish that?
background-process trap nix nix-shell
asked Aug 22 at 11:32
dmvianna
324312
add a comment |
I am developing a simple data science environment with Python tools and a database. When I enter the nix-shell, I spin up the database process. I would like to spin it down when exiting the environment.
How could I use trap and nix to accomplish that?
background-process trap nix nix-shell
asked Aug 22 at 11:32
dmvianna
324312
I am developing a simple data science environment with Python tools and a database. When I enter the nix-shell, I spin up the database process. I would like to spin it down when exiting the environment.
How could I use trap and nix to accomplish that?
background-process trap nix nix-shell
background-process trap nix nix-shell
asked Aug 22 at 11:32
dmvianna
324312
asked Aug 22 at 11:32
dmvianna
324312
asked Aug 22 at 11:32
dmvianna
324312
asked Aug 22 at 11:32
dmvianna
324312
asked Aug 22 at 11:32
dmvianna
324312
324312
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
I've been using something like the following:
./shell.nix:
let
pkgs = import <nixpkgs> { };
in with pkgs; mkShell {
buildInputs = [ glibcLocales postgresql ];
shellHook = ''
export LANG=en_US.UTF-8
PGDATABASE=some-dbname
PGDATA="$PWD/nix/pgdata"
PGHOST="$PWD/nix/sockets"
PGPORT="5433"
PGUSER="$USER"
trap "'$PWD/nix/client' remove" EXIT
nix/client add
'';
}
./nix/client
#! /usr/bin/env bash
set -eu
client_pid=$PPID
start_postgres() {
if postgres_is_stopped
then
logfile="$PWD/log/pg.log"
mkdir -p "$PGHOST" "${logfile%/*}"
(set -m
pg_ctl start --silent -w --log "$logfile" -o "-k $PGHOST -h ''")
fi
}
postgres_is_stopped() {
pg_ctl status >/dev/null
(( $? == 3 ))
}
case "$1" in
add)
mkdir -p nix/pids touch nix/pids/$client_pid
if [ -d "$PGDATA" ]
then
start_postgres
else
pg_ctl initdb --silent -o '--auth=trust' && start_postgres && createdb $PGDATABASE
fi
;;
remove)
rm nix/pids/$client_pid
if [ -n "$(find nix/pids -prune -empty)" ]
then
pg_ctl stop --silent -W
fi
;;
*)
echo "Usage: ${BASH_SOURCE[0]##*/} {add | remove}"
exit 1
;;
esac
The EXIT trap will shut down the database server if no other nix-shell sessions are still using it.
answered Dec 18 at 13:25
ivan
697719
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
I've been using something like the following:
./shell.nix:
let
pkgs = import <nixpkgs> { };
in with pkgs; mkShell {
buildInputs = [ glibcLocales postgresql ];
shellHook = ''
export LANG=en_US.UTF-8
PGDATABASE=some-dbname
PGDATA="$PWD/nix/pgdata"
PGHOST="$PWD/nix/sockets"
PGPORT="5433"
PGUSER="$USER"
trap "'$PWD/nix/client' remove" EXIT
nix/client add
'';
}
./nix/client
#! /usr/bin/env bash
set -eu
client_pid=$PPID
start_postgres() {
if postgres_is_stopped
then
logfile="$PWD/log/pg.log"
mkdir -p "$PGHOST" "${logfile%/*}"
(set -m
pg_ctl start --silent -w --log "$logfile" -o "-k $PGHOST -h ''")
fi
}
postgres_is_stopped() {
pg_ctl status >/dev/null
(( $? == 3 ))
}
case "$1" in
add)
mkdir -p nix/pids touch nix/pids/$client_pid
if [ -d "$PGDATA" ]
then
start_postgres
else
pg_ctl initdb --silent -o '--auth=trust' && start_postgres && createdb $PGDATABASE
fi
;;
remove)
rm nix/pids/$client_pid
if [ -n "$(find nix/pids -prune -empty)" ]
then
pg_ctl stop --silent -W
fi
;;
*)
echo "Usage: ${BASH_SOURCE[0]##*/} {add | remove}"
exit 1
;;
esac
The EXIT trap will shut down the database server if no other nix-shell sessions are still using it.
answered Dec 18 at 13:25
ivan
697719
add a comment |
I've been using something like the following:
./shell.nix:
let
pkgs = import <nixpkgs> { };
in with pkgs; mkShell {
buildInputs = [ glibcLocales postgresql ];
shellHook = ''
export LANG=en_US.UTF-8
PGDATABASE=some-dbname
PGDATA="$PWD/nix/pgdata"
PGHOST="$PWD/nix/sockets"
PGPORT="5433"
PGUSER="$USER"
trap "'$PWD/nix/client' remove" EXIT
nix/client add
'';
}
./nix/client
#! /usr/bin/env bash
set -eu
client_pid=$PPID
start_postgres() {
if postgres_is_stopped
then
logfile="$PWD/log/pg.log"
mkdir -p "$PGHOST" "${logfile%/*}"
(set -m
pg_ctl start --silent -w --log "$logfile" -o "-k $PGHOST -h ''")
fi
}
postgres_is_stopped() {
pg_ctl status >/dev/null
(( $? == 3 ))
}
case "$1" in
add)
mkdir -p nix/pids touch nix/pids/$client_pid
if [ -d "$PGDATA" ]
then
start_postgres
else
pg_ctl initdb --silent -o '--auth=trust' && start_postgres && createdb $PGDATABASE
fi
;;
remove)
rm nix/pids/$client_pid
if [ -n "$(find nix/pids -prune -empty)" ]
then
pg_ctl stop --silent -W
fi
;;
*)
echo "Usage: ${BASH_SOURCE[0]##*/} {add | remove}"
exit 1
;;
esac
The EXIT trap will shut down the database server if no other nix-shell sessions are still using it.
answered Dec 18 at 13:25
ivan
697719
add a comment |
I've been using something like the following:
./shell.nix:
let
pkgs = import <nixpkgs> { };
in with pkgs; mkShell {
buildInputs = [ glibcLocales postgresql ];
shellHook = ''
export LANG=en_US.UTF-8
PGDATABASE=some-dbname
PGDATA="$PWD/nix/pgdata"
PGHOST="$PWD/nix/sockets"
PGPORT="5433"
PGUSER="$USER"
trap "'$PWD/nix/client' remove" EXIT
nix/client add
'';
}
./nix/client
#! /usr/bin/env bash
set -eu
client_pid=$PPID
start_postgres() {
if postgres_is_stopped
then
logfile="$PWD/log/pg.log"
mkdir -p "$PGHOST" "${logfile%/*}"
(set -m
pg_ctl start --silent -w --log "$logfile" -o "-k $PGHOST -h ''")
fi
}
postgres_is_stopped() {
pg_ctl status >/dev/null
(( $? == 3 ))
}
case "$1" in
add)
mkdir -p nix/pids touch nix/pids/$client_pid
if [ -d "$PGDATA" ]
then
start_postgres
else
pg_ctl initdb --silent -o '--auth=trust' && start_postgres && createdb $PGDATABASE
fi
;;
remove)
rm nix/pids/$client_pid
if [ -n "$(find nix/pids -prune -empty)" ]
then
pg_ctl stop --silent -W
fi
;;
*)
echo "Usage: ${BASH_SOURCE[0]##*/} {add | remove}"
exit 1
;;
esac
The EXIT trap will shut down the database server if no other nix-shell sessions are still using it.
answered Dec 18 at 13:25
ivan
697719
I've been using something like the following:
./shell.nix:
let
pkgs = import <nixpkgs> { };
in with pkgs; mkShell {
buildInputs = [ glibcLocales postgresql ];
shellHook = ''
export LANG=en_US.UTF-8
PGDATABASE=some-dbname
PGDATA="$PWD/nix/pgdata"
PGHOST="$PWD/nix/sockets"
PGPORT="5433"
PGUSER="$USER"
trap "'$PWD/nix/client' remove" EXIT
nix/client add
'';
}
./nix/client
#! /usr/bin/env bash
set -eu
client_pid=$PPID
start_postgres() {
if postgres_is_stopped
then
logfile="$PWD/log/pg.log"
mkdir -p "$PGHOST" "${logfile%/*}"
(set -m
pg_ctl start --silent -w --log "$logfile" -o "-k $PGHOST -h ''")
fi
}
postgres_is_stopped() {
pg_ctl status >/dev/null
(( $? == 3 ))
}
case "$1" in
add)
mkdir -p nix/pids touch nix/pids/$client_pid
if [ -d "$PGDATA" ]
then
start_postgres
else
pg_ctl initdb --silent -o '--auth=trust' && start_postgres && createdb $PGDATABASE
fi
;;
remove)
rm nix/pids/$client_pid
if [ -n "$(find nix/pids -prune -empty)" ]
then
pg_ctl stop --silent -W
fi
;;
*)
echo "Usage: ${BASH_SOURCE[0]##*/} {add | remove}"
exit 1
;;
esac
The EXIT trap will shut down the database server if no other nix-shell sessions are still using it.
answered Dec 18 at 13:25
ivan
697719
answered Dec 18 at 13:25
ivan
697719
answered Dec 18 at 13:25
ivan
697719
answered Dec 18 at 13:25
ivan
697719
697719
add a comment |
add a comment |
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