[PATCH 08/17] util: add function for looking up the user shell

["Daniel P. Berrange" <berrange@xxxxxxxxxx>]

Add a virGetUserShell wrapper around virGetUserEnt, that
returns the shell field.

Signed-off-by: Daniel P. Berrange <berrange@xxxxxxxxxx>
---
 src/libvirt_private.syms |  1 +
 src/util/virutil.c       | 51 ++++++++++++++++++++++++++++++++++++++++--------
 src/util/virutil.h       |  1 +
 3 files changed, 45 insertions(+), 8 deletions(-)

diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
index 22b81ae..f88dd02 100644
--- a/src/libvirt_private.syms
+++ b/src/libvirt_private.syms
@@ -2460,6 +2460,7 @@ virGetUserDirectoryByUID;
 virGetUserID;
 virGetUserName;
 virGetUserRuntimeDirectory;
+virGetUserShell;
 virHexToBin;
 virIndexToDiskName;
 virIsCapableFCHost;
diff --git a/src/util/virutil.c b/src/util/virutil.c
index 8205150..d151c1c 100644
--- a/src/util/virutil.c
+++ b/src/util/virutil.c
@@ -750,7 +750,7 @@ virGetUserDirectory(void)
 /* Look up fields from the user database for the given user.  On
  * error, set errno, report the error, and return -1.  */
 static int
-virGetUserEnt(uid_t uid, char **name, gid_t *group, char **dir)
+virGetUserEnt(uid_t uid, char **name, gid_t *group, char **dir, char **shell)
 {
     char *strbuf;
     struct passwd pwbuf;
@@ -764,6 +764,8 @@ virGetUserEnt(uid_t uid, char **name, gid_t *group, char **dir)
         *name = NULL;
     if (dir)
         *dir = NULL;
+    if (shell)
+        *shell = NULL;
 
     /* sysconf is a hint; if it fails, fall back to a reasonable size */
     if (val < 0)
@@ -799,14 +801,21 @@ virGetUserEnt(uid_t uid, char **name, gid_t *group, char **dir)
         goto cleanup;
     if (group)
         *group = pw->pw_gid;
-    if (dir && VIR_STRDUP(*dir, pw->pw_dir) < 0) {
-        if (name)
-            VIR_FREE(*name);
+    if (dir && VIR_STRDUP(*dir, pw->pw_dir) < 0)
+        goto cleanup;
+    if (shell && VIR_STRDUP(*shell, pw->pw_shell) < 0)
         goto cleanup;
-    }
 
     ret = 0;
  cleanup:
+    if (ret < 0) {
+        if (name)
+            VIR_FREE(*name);
+        if (dir)
+            VIR_FREE(*dir);
+        if (shell)
+            VIR_FREE(*shell);
+    }
     VIR_FREE(strbuf);
     return ret;
 }
@@ -866,7 +875,15 @@ char *
 virGetUserDirectoryByUID(uid_t uid)
 {
     char *ret;
-    virGetUserEnt(uid, NULL, NULL, &ret);
+    virGetUserEnt(uid, NULL, NULL, &ret, NULL);
+    return ret;
+}
+
+
+char *virGetUserShell(uid_t uid)
+{
+    char *ret;
+    virGetUserEnt(uid, NULL, NULL, NULL, &ret);
     return ret;
 }
 
@@ -916,7 +933,7 @@ char *virGetUserRuntimeDirectory(void)
 char *virGetUserName(uid_t uid)
 {
     char *ret;
-    virGetUserEnt(uid, &ret, NULL, NULL);
+    virGetUserEnt(uid, &ret, NULL, NULL, NULL);
     return ret;
 }
 
@@ -1102,7 +1119,7 @@ virGetGroupList(uid_t uid, gid_t gid, gid_t **list)
     if (uid == (uid_t)-1)
         return 0;
 
-    if (virGetUserEnt(uid, &user, &primary, NULL) < 0)
+    if (virGetUserEnt(uid, &user, &primary, NULL, NULL) < 0)
         return -1;
 
     ret = mgetgroups(user, primary, list);
@@ -1277,6 +1294,15 @@ virGetUserDirectoryByUID(uid_t uid ATTRIBUTE_UNUSED)
 }
 
 char *
+virGetUserShell(uid_t uid ATTRIBUTE_UNUSED)
+{
+    virReportError(VIR_ERR_INTERNAL_ERROR,
+                   "%s", _("virGetUserShell is not available"));
+
+    return NULL;
+}
+
+char *
 virGetUserConfigDirectory(void)
 {
     char *ret;
@@ -1323,6 +1349,15 @@ virGetUserDirectoryByUID(uid_t uid ATTRIBUTE_UNUSED)
 }
 
 char *
+virGetUserShell(uid_t uid ATTRIBUTE_UNUSED)
+{
+    virReportError(VIR_ERR_INTERNAL_ERROR,
+                   "%s", _("virGetUserShell is not available"));
+
+    return NULL;
+}
+
+char *
 virGetUserConfigDirectory(void)
 {
     virReportError(VIR_ERR_INTERNAL_ERROR,
diff --git a/src/util/virutil.h b/src/util/virutil.h
index 1e51a25..703ec53 100644
--- a/src/util/virutil.h
+++ b/src/util/virutil.h
@@ -139,6 +139,7 @@ char *virGetUserDirectoryByUID(uid_t uid);
 char *virGetUserConfigDirectory(void);
 char *virGetUserCacheDirectory(void);
 char *virGetUserRuntimeDirectory(void);
+char *virGetUserShell(uid_t uid);
 char *virGetUserName(uid_t uid);
 char *virGetGroupName(gid_t gid);
 int virGetGroupList(uid_t uid, gid_t group, gid_t **groups)
-- 
2.5.5

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