Instead of duplicating the code from virGet{User,Group}IDByName(), which are
static anyway, extend those functions to accept NULL pointers for the result and
a boolean for controlling the error reporting.
Signed-off-by: Martin Kletzander <mklet...@redhat.com>
---
Feel free to suggest any other way of doing this, I just felt like this is the
most readable way of doing things
src/libvirt_private.syms | 2 ++
src/util/virutil.c | 40 ++++++++++++++++++++++++++++++++--------
src/util/virutil.h | 4 ++++
3 files changed, 38 insertions(+), 8 deletions(-)
diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
index a0d229a79f0c..e7a4d61f25fd 100644
--- a/src/libvirt_private.syms
+++ b/src/libvirt_private.syms
@@ -3090,6 +3090,8 @@ virUSBDeviceSetUsedBy;
# util/virutil.h
+virDoesGroupExist;
+virDoesUserExist;
virDoubleToStr;
virEnumFromString;
virEnumToString;
diff --git a/src/util/virutil.c b/src/util/virutil.c
index a908422feb7f..2290020e494e 100644
--- a/src/util/virutil.c
+++ b/src/util/virutil.c
@@ -971,9 +971,11 @@ char *virGetGroupName(gid_t gid)
/* Search in the password database for a user id that matches the user name
* `name`. Returns 0 on success, -1 on failure or 1 if name cannot be found.
+ *
+ * Warns if @missing_ok is false
*/
static int
-virGetUserIDByName(const char *name, uid_t *uid)
+virGetUserIDByName(const char *name, uid_t *uid, bool missing_ok)
{
char *strbuf = NULL;
struct passwd pwbuf;
@@ -996,7 +998,7 @@ virGetUserIDByName(const char *name, uid_t *uid)
}
if (!pw) {
- if (rc != 0) {
+ if (rc != 0 && !missing_ok) {
char buf[1024];
/* log the possible error from getpwnam_r. Unfortunately error
* reporting from this function is bad and we can't really
@@ -1009,7 +1011,8 @@ virGetUserIDByName(const char *name, uid_t *uid)
goto cleanup;
}
- *uid = pw->pw_uid;
+ if (uid)
+ *uid = pw->pw_uid;
ret = 0;
cleanup:
@@ -1032,7 +1035,7 @@ virGetUserID(const char *user, uid_t *uid)
if (*user == '+') {
user++;
} else {
- int rc = virGetUserIDByName(user, uid);
+ int rc = virGetUserIDByName(user, uid, false);
if (rc <= 0)
return rc;
}
@@ -1051,9 +1054,11 @@ virGetUserID(const char *user, uid_t *uid)
/* Search in the group database for a group id that matches the group name
* `name`. Returns 0 on success, -1 on failure or 1 if name cannot be found.
+ *
+ * Warns if @missing_ok is false
*/
static int
-virGetGroupIDByName(const char *name, gid_t *gid)
+virGetGroupIDByName(const char *name, gid_t *gid, bool missing_ok)
{
char *strbuf = NULL;
struct group grbuf;
@@ -1076,7 +1081,7 @@ virGetGroupIDByName(const char *name, gid_t *gid)
}
if (!gr) {
- if (rc != 0) {
+ if (rc != 0 && !missing_ok) {
char buf[1024];
/* log the possible error from getgrnam_r. Unfortunately error
* reporting from this function is bad and we can't really
@@ -1089,7 +1094,8 @@ virGetGroupIDByName(const char *name, gid_t *gid)
goto cleanup;
}
- *gid = gr->gr_gid;
+ if (gid)
+ *gid = gr->gr_gid;
ret = 0;
cleanup:
@@ -1112,7 +1118,7 @@ virGetGroupID(const char *group, gid_t *gid)
if (*group == '+') {
group++;
} else {
- int rc = virGetGroupIDByName(group, gid);
+ int rc = virGetGroupIDByName(group, gid, false);
if (rc <= 0)
return rc;
}
@@ -1129,6 +1135,24 @@ virGetGroupID(const char *group, gid_t *gid)
return 0;
}
+/* Silently checks if User @name exists.
+ * Returns if the user exists and fallbacks to false on error.
+ */
+int
+virDoesUserExist(const char *name, bool *exists)
+{
+ return virGetUserIDByName(name, NULL, true) == 0;
+}
+
+/* Silently checks if Group @name exists.
+ * Returns if the group exists and fallbacks to false on error.
+ */
+int
+virDoesGroupExist(const char *name)
+{
+ return virGetGroupIDByName(name, NULL, true) == 0;
+}
+
/* Compute the list of primary and supplementary groups associated
* with @uid, and including @gid in the list (unless it is -1),
diff --git a/src/util/virutil.h b/src/util/virutil.h
index 1ba9635bd991..8a27cca523c8 100644
--- a/src/util/virutil.h
+++ b/src/util/virutil.h
@@ -152,6 +152,10 @@ int virGetUserID(const char *name,
int virGetGroupID(const char *name,
gid_t *gid) ATTRIBUTE_RETURN_CHECK;
+int virDoesUserExist(const char *name, bool *exists);
+int virDoesGroupExist(const char *name, bool *exists);
+
+
bool virIsDevMapperDevice(const char *dev_name) ATTRIBUTE_NONNULL(1);
bool virValidateWWN(const char *wwn);
--
2.18.0
--
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