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core: introduce specifiers for /tmp and /var/tmp

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This corresponds nicely with the specifiers we already pass for
/var/lib, /var/cache, /run and so on.

This is particular useful to update the test-path service files to
operate without guessable files, thus allowing multiple parallel
test-path invocations to pass without issues (the idea is to set $TMPDIR
early on in the test to some private directory, and then only use the
new %T or %V specifier to refer to it).
This commit is contained in:
Lennart Poettering 2018-05-29 11:25:26 +02:00
parent 709f4c472c
commit b294e5943f
8 changed files with 73 additions and 3 deletions
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10
man/systemd.unit.xml
View File

@ -1626,6 +1626,11 @@
<entry>Runtime directory root</entry>
<entry>This is either <filename>/run</filename> (for the system manager) or the path <literal>$XDG_RUNTIME_DIR</literal> resolves to (for user managers).</entry>
</row>
<row>
<entry><literal>%T</literal></entry>
<entry>Directory for temporary files</entry>
<entry>This is either <filename>/tmp</filename> or the path <literal>$TMPDIR</literal>, <literal>$TEMP</literal> or <literal>$TMP</literal> are set to.</entry>
</row>
<row>
<entry><literal>%u</literal></entry>
<entry>User name</entry>
@ -1641,6 +1646,11 @@
<entry>Kernel release</entry>
<entry>Identical to <command>uname -r</command> output</entry>
</row>
<row>
<entry><literal>%V</literal></entry>
<entry>Directory for larger and persistent temporary files</entry>
<entry>This is either <filename>/var/tmp</filename> or the path <literal>$TMPDIR</literal>, <literal>$TEMP</literal> or <literal>$TMP</literal> are set to.</entry>
</row>
<row>
<entry><literal>%%</literal></entry>
<entry>Single percent sign</entry>

10
man/tmpfiles.d.xml
View File

@ -651,6 +651,11 @@ r! /tmp/.X[0-9]*-lock</programlisting>
<entry>System or user runtime directory</entry>
<entry>In --user mode, this is the same <varname>$XDG_RUNTIME_DIR</varname>, and <filename>/run</filename> otherwise.</entry>
</row>
<row>
<entry><literal>%T</literal></entry>
<entry>Directory for temporary files</entry>
<entry>This is either <filename>/tmp</filename> or the path <literal>$TMPDIR</literal>, <literal>$TEMP</literal> or <literal>$TMP</literal> are set to.</entry>
</row>
<row>
<entry><literal>%u</literal></entry>
<entry>User name</entry>
@ -666,6 +671,11 @@ r! /tmp/.X[0-9]*-lock</programlisting>
<entry>Kernel release</entry>
<entry>Identical to <command>uname -r</command> output.</entry>
</row>
<row>
<entry><literal>%V</literal></entry>
<entry>Directory for larger and persistent temporary files</entry>
<entry>This is either <filename>/var/tmp</filename> or the path <literal>$TMPDIR</literal>, <literal>$TEMP</literal> or <literal>$TMP</literal> are set to.</entry>
</row>
<row>
<entry><literal>%%</literal></entry>
<entry>Escaped <literal>%</literal></entry>

5
src/core/unit-printf.c
View File

@ -232,6 +232,8 @@ int unit_full_printf(Unit *u, const char *format, char **ret) {
* %S: the state directory root (e.g. /var/lib or $XDG_CONFIG_HOME)
* %C: the cache directory root (e.g. /var/cache or $XDG_CACHE_HOME)
* %L: the log directory root (e.g. /var/log or $XDG_CONFIG_HOME/log)
* %T: the temporary directory (e.g. /tmp, or $TMPDIR, $TEMP, $TMP)
* %V: the temporary directory for large, persistent stuff (e.g. /var/tmp, or $TMPDIR, $TEMP, $TMP)
*
* %h: the homedir of the running user
* %s: the shell of the running user
@ -257,10 +259,13 @@ int unit_full_printf(Unit *u, const char *format, char **ret) {
{ 'c', specifier_cgroup, NULL },
{ 'r', specifier_cgroup_slice, NULL },
{ 'R', specifier_cgroup_root, NULL },
{ 't', specifier_special_directory, UINT_TO_PTR(EXEC_DIRECTORY_RUNTIME) },
{ 'S', specifier_special_directory, UINT_TO_PTR(EXEC_DIRECTORY_STATE) },
{ 'C', specifier_special_directory, UINT_TO_PTR(EXEC_DIRECTORY_CACHE) },
{ 'L', specifier_special_directory, UINT_TO_PTR(EXEC_DIRECTORY_LOGS) },
{ 'T', specifier_tmp_dir, NULL },
{ 'V', specifier_var_tmp_dir, NULL },
{ 'U', specifier_user_id, NULL },
{ 'u', specifier_user_name, NULL },

35
src/shared/specifier.c
View File

@ -15,6 +15,7 @@
#include "sd-id128.h"
#include "alloc-util.h"
#include "fs-util.h"
#include "hostname-util.h"
#include "macro.h"
#include "specifier.h"
@ -222,6 +223,40 @@ int specifier_user_shell(char specifier, void *data, void *userdata, char **ret)
return get_shell(ret);
}
int specifier_tmp_dir(char specifier, void *data, void *userdata, char **ret) {
const char *p;
char *copy;
int r;
r = tmp_dir(&p);
if (r < 0)
return r;
copy = strdup(p);
if (!copy)
return -ENOMEM;
*ret = copy;
return 0;
}
int specifier_var_tmp_dir(char specifier, void *data, void *userdata, char **ret) {
const char *p;
char *copy;
int r;
r = var_tmp_dir(&p);
if (r < 0)
return r;
copy = strdup(p);
if (!copy)
return -ENOMEM;
*ret = copy;
return 0;
}
int specifier_escape_strv(char **l, char ***ret) {
char **z, **p, **q;

3
src/shared/specifier.h
View File

@ -31,6 +31,9 @@ int specifier_user_id(char specifier, void *data, void *userdata, char **ret);
int specifier_user_home(char specifier, void *data, void *userdata, char **ret);
int specifier_user_shell(char specifier, void *data, void *userdata, char **ret);
int specifier_tmp_dir(char specifier, void *data, void *userdata, char **ret);
int specifier_var_tmp_dir(char specifier, void *data, void *userdata, char **ret);
static inline char* specifier_escape(const char *string) {
return strreplace(string, "%", "%%");
}

8
src/sysusers/sysusers.c
View File

@ -1359,10 +1359,12 @@ static bool item_equal(Item *a, Item *b) {
static int parse_line(const char *fname, unsigned line, const char *buffer) {
static const Specifier specifier_table[] = {
{ 'm', specifier_machine_id, NULL },
{ 'b', specifier_boot_id, NULL },
{ 'H', specifier_host_name, NULL },
{ 'm', specifier_machine_id, NULL },
{ 'b', specifier_boot_id, NULL },
{ 'H', specifier_host_name, NULL },
{ 'v', specifier_kernel_release, NULL },
{ 'T', specifier_tmp_dir, NULL },
{ 'V', specifier_var_tmp_dir, NULL },
{}
};

3
src/tmpfiles/tmpfiles.c
View File

@ -179,10 +179,13 @@ static const Specifier specifier_table[] = {
{ 'U', specifier_user_id, NULL },
{ 'u', specifier_user_name, NULL },
{ 'h', specifier_user_home, NULL },
{ 't', specifier_directory, UINT_TO_PTR(DIRECTORY_RUNTIME) },
{ 'S', specifier_directory, UINT_TO_PTR(DIRECTORY_STATE) },
{ 'C', specifier_directory, UINT_TO_PTR(DIRECTORY_CACHE) },
{ 'L', specifier_directory, UINT_TO_PTR(DIRECTORY_LOGS) },
{ 'T', specifier_tmp_dir, NULL },
{ 'V', specifier_var_tmp_dir, NULL },
{}
};

2
test/test-execute/exec-specifier.service
View File

@ -16,6 +16,8 @@ ExecStart=test %t = /run
ExecStart=test %S = /var/lib
ExecStart=test %C = /var/cache
ExecStart=test %L = /var/log
ExecStart=test %T = /tmp
ExecStart=test %V = /var/tmp
ExecStart=sh -c 'test %u = $$(id -un 0)'
ExecStart=test %U = 0
ExecStart=sh -c 'test %h = $$(getent passwd 0 | cut -d: -f 6)'