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unit: introduce RequiredBy= setting in [Install], to complement WantedBy=

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This commit is contained in:
Lennart Poettering 2012-05-21 15:27:26 +02:00
parent 6ccf7562da
commit 78d54bd42b
3 changed files with 55 additions and 5 deletions
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2
man/systemd.unit.xml
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@ -951,9 +951,11 @@
<varlistentry>
<term><varname>WantedBy=</varname></term>
<term><varname>RequiredBy=</varname></term>
<listitem><para>Installs a symlink in
the <filename>.wants/</filename>
resp. <filename>.requires/</filename>
subdirectory for a unit. This has the
effect that when the listed unit name
is activated the unit listing it is

1
src/core/load-fragment-gperf.gperf.m4
View File

@ -230,4 +230,5 @@ Path.DirectoryMode, config_parse_mode, 0,
m4_dnl The [Install] section is ignored here.
Install.Alias, NULL, 0, 0
Install.WantedBy, NULL, 0, 0
Install.RequiredBy, NULL, 0, 0
Install.Also, NULL, 0, 0

57
src/shared/install.c
View File

@ -43,6 +43,7 @@ typedef struct {
char **aliases;
char **wanted_by;
char **required_by;
} InstallInfo;
typedef struct {
@ -883,6 +884,7 @@ static void install_info_free(InstallInfo *i) {
free(i->path);
strv_free(i->aliases);
strv_free(i->wanted_by);
strv_free(i->required_by);
free(i);
}
@ -1021,9 +1023,10 @@ static int unit_file_load(
bool allow_symlink) {
const ConfigTableItem items[] = {
{ "Install", "Alias", config_parse_strv, 0, &info->aliases },
{ "Install", "WantedBy", config_parse_strv, 0, &info->wanted_by },
{ "Install", "Also", config_parse_also, 0, c },
{ "Install", "Alias", config_parse_strv, 0, &info->aliases },
{ "Install", "WantedBy", config_parse_strv, 0, &info->wanted_by },
{ "Install", "RequiredBy", config_parse_strv, 0, &info->required_by },
{ "Install", "Also", config_parse_also, 0, c },
{ NULL, NULL, NULL, 0, NULL }
};
@ -1050,7 +1053,10 @@ static int unit_file_load(
if (r < 0)
return r;
return strv_length(info->aliases) + strv_length(info->wanted_by);
return
strv_length(info->aliases) +
strv_length(info->wanted_by) +
strv_length(info->required_by);
}
static int unit_file_search(
@ -1121,7 +1127,10 @@ static int unit_file_can_install(
r = unit_file_search(&c, i, paths, root_dir, allow_symlink);
if (r >= 0)
r = strv_length(i->aliases) + strv_length(i->wanted_by);
r =
strv_length(i->aliases) +
strv_length(i->wanted_by) +
strv_length(i->required_by);
install_context_done(&c);
@ -1241,6 +1250,40 @@ static int install_info_symlink_wants(
return r;
}
static int install_info_symlink_requires(
InstallInfo *i,
const char *config_path,
bool force,
UnitFileChange **changes,
unsigned *n_changes) {
char **s;
int r = 0, q;
assert(i);
assert(config_path);
STRV_FOREACH(s, i->required_by) {
char *path;
if (!unit_name_is_valid_no_type(*s, true)) {
r = -EINVAL;
continue;
}
if (asprintf(&path, "%s/%s.requires/%s", config_path, *s, i->name) < 0)
return -ENOMEM;
q = create_symlink(i->path, path, force, changes, n_changes);
free(path);
if (r == 0)
r = q;
}
return r;
}
static int install_info_symlink_link(
InstallInfo *i,
LookupPaths *paths,
@ -1290,6 +1333,10 @@ static int install_info_apply(
if (r == 0)
r = q;
q = install_info_symlink_requires(i, config_path, force, changes, n_changes);
if (r == 0)
r = q;
q = install_info_symlink_link(i, paths, config_path, force, changes, n_changes);
if (r == 0)
r = q;