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From f41927c026d65e9005c0ba418c6bfff511055bd2 Mon Sep 17 00:00:00 2001
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From: Yu Watanabe <watanabe.yu+github@gmail.com>
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Date: Tue, 11 Sep 2018 14:05:08 +0900
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Subject: [PATCH] core: add new environment variable $RUNTIME_DIRECTORY= or
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friends
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The variable is generated from RuntimeDirectory= or friends.
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If multiple directories are set, then they are concatenated with
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the separator ':'.
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(cherry picked from commit fb2042dd55de5019f55931b4f20a44700ec1222b)
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Resolves: #2049788
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---
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TODO | 9 ---------
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src/core/execute.c | 46 ++++++++++++++++++++++++++++++++++++++++++++--
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2 files changed, 44 insertions(+), 11 deletions(-)
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diff --git a/TODO b/TODO
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index 0705b6b08e..c52f9b25f3 100644
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--- a/TODO
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+++ b/TODO
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@@ -214,15 +214,6 @@ Features:
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for all units. It should be both a way to pin units into memory as well as a
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wait to retrieve their exit data.
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-* maybe set a new set of env vars for services, based on RuntimeDirectory=,
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- StateDirectory=, LogsDirectory=, CacheDirectory= and ConfigurationDirectory=
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- automatically. For example, there could be $RUNTIME_DIRECTORY,
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- $STATE_DIRECTORY, $LOGS_DIRECTORY=, $CACHE_DIRECTORY and
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- $CONFIGURATION_DIRECTORY or so. This could be useful to write services that
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- can adapt to varying directories for these purposes. Special care has to be
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- taken if multiple dirs are configured. Maybe avoid setting the env vars in
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- that case?
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-
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* expose IO accounting data on the bus, show it in systemd-run --wait and log
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about it in the resource log message
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diff --git a/src/core/execute.c b/src/core/execute.c
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index 3ff1a51aa1..9cbb678ac4 100644
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--- a/src/core/execute.c
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+++ b/src/core/execute.c
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@@ -1606,6 +1606,8 @@ static void do_idle_pipe_dance(int idle_pipe[4]) {
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idle_pipe[3] = safe_close(idle_pipe[3]);
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}
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+static const char *exec_directory_env_name_to_string(ExecDirectoryType t);
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+
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static int build_environment(
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const Unit *u,
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const ExecContext *c,
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@@ -1619,6 +1621,7 @@ static int build_environment(
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char ***ret) {
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_cleanup_strv_free_ char **our_env = NULL;
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+ ExecDirectoryType t;
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size_t n_env = 0;
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char *x;
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@@ -1627,7 +1630,7 @@ static int build_environment(
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assert(p);
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assert(ret);
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- our_env = new0(char*, 14);
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+ our_env = new0(char*, 14 + _EXEC_DIRECTORY_TYPE_MAX);
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if (!our_env)
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return -ENOMEM;
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@@ -1733,8 +1736,37 @@ static int build_environment(
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our_env[n_env++] = x;
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}
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+ for (t = 0; t < _EXEC_DIRECTORY_TYPE_MAX; t++) {
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+ _cleanup_free_ char *pre = NULL, *joined = NULL;
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+ const char *n;
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+
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+ if (!p->prefix[t])
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+ continue;
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+
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+ if (strv_isempty(c->directories[t].paths))
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+ continue;
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+
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+ n = exec_directory_env_name_to_string(t);
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+ if (!n)
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+ continue;
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+
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+ pre = strjoin(p->prefix[t], "/");
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+ if (!pre)
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+ return -ENOMEM;
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+
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+ joined = strv_join_prefix(c->directories[t].paths, ":", pre);
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+ if (!joined)
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+ return -ENOMEM;
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+
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+ x = strjoin(n, "=", joined);
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+ if (!x)
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+ return -ENOMEM;
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+
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+ our_env[n_env++] = x;
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+ }
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+
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our_env[n_env++] = NULL;
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- assert(n_env <= 14);
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+ assert(n_env <= 14 + _EXEC_DIRECTORY_TYPE_MAX);
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*ret = TAKE_PTR(our_env);
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@@ -5197,6 +5229,16 @@ static const char* const exec_directory_type_table[_EXEC_DIRECTORY_TYPE_MAX] = {
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DEFINE_STRING_TABLE_LOOKUP(exec_directory_type, ExecDirectoryType);
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+static const char* const exec_directory_env_name_table[_EXEC_DIRECTORY_TYPE_MAX] = {
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+ [EXEC_DIRECTORY_RUNTIME] = "RUNTIME_DIRECTORY",
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+ [EXEC_DIRECTORY_STATE] = "STATE_DIRECTORY",
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+ [EXEC_DIRECTORY_CACHE] = "CACHE_DIRECTORY",
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+ [EXEC_DIRECTORY_LOGS] = "LOGS_DIRECTORY",
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+ [EXEC_DIRECTORY_CONFIGURATION] = "CONFIGURATION_DIRECTORY",
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+};
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+
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+DEFINE_PRIVATE_STRING_TABLE_LOOKUP_TO_STRING(exec_directory_env_name, ExecDirectoryType);
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+
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static const char* const exec_keyring_mode_table[_EXEC_KEYRING_MODE_MAX] = {
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[EXEC_KEYRING_INHERIT] = "inherit",
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[EXEC_KEYRING_PRIVATE] = "private",
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