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systemd: enable/disable instances of template

Browse source 
https://bugzilla.redhat.com/show_bug.cgi?id=752774
This commit is contained in:
Michal Sekletar 2012-07-13 15:59:26 +02:00 committed by Michal Schmidt
parent ac6a4abed3
commit 29283ea4cf
4 changed files with 100 additions and 24 deletions
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33
man/systemctl.xml
View file

@ -682,24 +682,29 @@
<varlistentry>
<term><command>enable [NAME...]</command></term>
<listitem><para>Enable one or more
unit files, as specified on the
<listitem><para>Enable one or
more unit files or unit file
instances, as specified on the
command line. This will create a
number of symlinks as encoded in the
<literal>[Install]</literal> sections
of the unit files. After the symlinks
have been created the systemd
configuration is reloaded (in a way
that is equivalent to
<command>daemon-reload</command>) to
ensure the changes are taken into
number of symlinks as encoded in
the <literal>[Install]</literal>
sections of the unit files. After
the symlinks have been created the
systemd configuration is reloaded
(in a way that is equivalent to
<command>daemon-reload</command>)
to ensure the changes are taken into
account immediately. Note that this
does not have the effect that any of
the units enabled are also started at
the same time. If this is desired a
separate <command>start</command>
command must be invoked for the
unit.</para>
the same time. If this is desired
a separate <command>start</command>
command must be invoked for the unit.
Also note that in case of instance
enablement, symlinks named same as
instances are created in install
location, however they all point to
the same template unit file.</para>
<para>This command will
print the actions executed. This

78
src/shared/install.c
View file

@ -196,7 +196,8 @@ static int remove_marked_symlinks_fd(
const char *config_path,
bool *deleted,
UnitFileChange **changes,
unsigned *n_changes) {
unsigned *n_changes,
char** files) {
int r = 0;
DIR *d;
@ -255,7 +256,7 @@ static int remove_marked_symlinks_fd(
}
/* This will close nfd, regardless whether it succeeds or not */
q = remove_marked_symlinks_fd(remove_symlinks_to, nfd, p, config_path, deleted, changes, n_changes);
q = remove_marked_symlinks_fd(remove_symlinks_to, nfd, p, config_path, deleted, changes, n_changes, files);
free(p);
if (r == 0)
@ -288,6 +289,9 @@ static int remove_marked_symlinks_fd(
set_get(remove_symlinks_to, dest) ||
set_get(remove_symlinks_to, path_get_file_name(dest));
if (unit_name_is_instance(p))
found = found && strv_contains(files, path_get_file_name(p));
if (found) {
if (unlink(p) < 0 && errno != ENOENT) {
@ -326,7 +330,8 @@ static int remove_marked_symlinks(
Set *remove_symlinks_to,
const char *config_path,
UnitFileChange **changes,
unsigned *n_changes) {
unsigned *n_changes,
char** files) {
int fd, r = 0;
bool deleted;
@ -351,7 +356,7 @@ static int remove_marked_symlinks(
}
/* This takes possession of cfd and closes it */
q = remove_marked_symlinks_fd(remove_symlinks_to, cfd, config_path, config_path, &deleted, changes, n_changes);
q = remove_marked_symlinks_fd(remove_symlinks_to, cfd, config_path, config_path, &deleted, changes, n_changes, files);
if (r == 0)
r = q;
} while (deleted);
@ -717,7 +722,7 @@ int unit_file_unmask(
finish:
q = remove_marked_symlinks(remove_symlinks_to, config_path, changes, n_changes);
q = remove_marked_symlinks(remove_symlinks_to, config_path, changes, n_changes, files);
if (r == 0)
r = q;
@ -1094,8 +1099,48 @@ static int unit_file_search(
if (r >= 0)
info->path = path;
else
else {
if (r == -ENOENT && unit_name_is_instance(info->name)) {
/* unit file doesn't exist, however instance enablement was request */
/* we will check if it is possible to load template unit file */
char *template = NULL,
*template_path = NULL,
*template_dir = NULL;
template = unit_name_template(info->name);
if (!template) {
free(path);
return -ENOMEM;
}
/* we will reuse path variable since we don't need it anymore */
template_dir = path;
*(strrchr(path, '/') + 1) = '\0';
template_path = strjoin(template_dir, template, NULL);
if (!template_path) {
free(path);
free(template);
return -ENOMEM;
}
/* let's try to load template unit */
r = unit_file_load(c, info, template_path, allow_symlink);
if (r >= 0) {
info->path = strdup(template_path);
if (!info->path) {
free(path);
free(template);
free(template_path);
return -ENOMEM;
}
}
free(template);
free(template_path);
}
free(path);
}
if (r != -ENOENT && r != -ELOOP)
return r;
@ -1419,7 +1464,20 @@ static int install_context_mark_for_removal(
} else if (r >= 0)
r += q;
q = mark_symlink_for_removal(remove_symlinks_to, i->name);
if (unit_name_is_instance(i->name)) {
char *unit_file = NULL;
unit_file = path_get_file_name(i->path);
if (unit_name_is_instance(unit_file))
/* unit file named as instance exists, thus all symlinks pointing to it, will be removed */
q = mark_symlink_for_removal(remove_symlinks_to, i->name);
else
/* does not exist, thus we will mark for removal symlinks to template unit file */
q = mark_symlink_for_removal(remove_symlinks_to, unit_file);
} else
q = mark_symlink_for_removal(remove_symlinks_to, i->name);
if (r >= 0 && q < 0)
r = q;
}
@ -1511,7 +1569,7 @@ int unit_file_disable(
r = install_context_mark_for_removal(&c, &paths, &remove_symlinks_to, config_path, root_dir);
q = remove_marked_symlinks(remove_symlinks_to, config_path, changes, n_changes);
q = remove_marked_symlinks(remove_symlinks_to, config_path, changes, n_changes, files);
if (r == 0)
r = q;
@ -1563,7 +1621,7 @@ int unit_file_reenable(
goto finish;
}
r = remove_marked_symlinks(remove_symlinks_to, config_path, changes, n_changes);
r = remove_marked_symlinks(remove_symlinks_to, config_path, changes, n_changes, files);
/* Returns number of symlinks that where supposed to be installed. */
q = install_context_apply(&c, &paths, config_path, root_dir, force, changes, n_changes);
@ -1813,7 +1871,7 @@ int unit_file_preset(
r = install_context_mark_for_removal(&minus, &paths, &remove_symlinks_to, config_path, root_dir);
q = remove_marked_symlinks(remove_symlinks_to, config_path, changes, n_changes);
q = remove_marked_symlinks(remove_symlinks_to, config_path, changes, n_changes, files);
if (r == 0)
r = q;

12
src/shared/unit-name.c
View file

@ -341,6 +341,18 @@ bool unit_name_is_template(const char *n) {
return p[1] == '.';
}
bool unit_name_is_instance(const char *n) {
const char *p;
assert(n);
p = strchr(n, '@');
if (!p)
return false;
return p[1] != '.';
}
char *unit_name_replace_instance(const char *f, const char *i) {
const char *p, *e;
char *r, *k;

1
src/shared/unit-name.h
View file

@ -79,6 +79,7 @@ char *unit_name_path_escape(const char *f);
char *unit_name_path_unescape(const char *f);
bool unit_name_is_template(const char *n);
bool unit_name_is_instance(const char *n);
char *unit_name_replace_instance(const char *f, const char *i);