[gnome-build-meta/mcatanzaro/krb5-mtime] sdk/krb5.bst: add mtime.patch

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 0383c65c330c389cc6f2fddfb7340cb2d3fe364e
Author: Michael Catanzaro <mcatanzaro redhat com>
Date:   Thu May 19 12:07:05 2022 -0500

    sdk/krb5.bst: add mtime.patch
    
    This should hopefully make gssproxy work inside the flatpak environment.
    See: https://github.com/krb5/krb5/pull/1249

 elements/sdk/krb5.bst  |  2 ++
 files/krb5/mtime.patch | 67 ++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 69 insertions(+)
---
diff --git a/elements/sdk/krb5.bst b/elements/sdk/krb5.bst
index 649f1709b..1ce26beb5 100644
--- a/elements/sdk/krb5.bst
+++ b/elements/sdk/krb5.bst
@@ -3,6 +3,8 @@ kind: autotools
 sources:
 - kind: tar
   url: kerberos:dist/krb5/1.19/krb5-1.19.2.tar.gz
+- kind: patch
+  path: files/krb5/mtime.patch
 
 build-depends:
 - freedesktop-sdk.bst:components/bison.bst
diff --git a/files/krb5/mtime.patch b/files/krb5/mtime.patch
new file mode 100644
index 000000000..f6749221e
--- /dev/null
+++ b/files/krb5/mtime.patch
@@ -0,0 +1,67 @@
+From f7843c7487f8246fcc92dc9b7d3c0bab8755e728 Mon Sep 17 00:00:00 2001
+From: Simo Sorce <simo redhat com>
+Date: Thu, 19 May 2022 12:27:40 -0400
+Subject: [PATCH] Always read the configuration files the first time
+
+There is at least one case (with flatpaks) where configuration files
+in the special read-only /etc all have (time_t)0 as mtime.
+
+This causes the current code to not read the configuration files even
+once because the comparison in check_link_mtime() assumes that a mtime
+on disk is always greater than 0 and the initial "high" value
+g_confFileModTime is set to 0.
+
+To address this we change the initial high value to the be the "invalid"
+value (time_t)-1
+Then we special case the check in check_link_mtime() to always,
+unconditionally, load the configuration file when the initial '-1' value
+is seen.
+
+After the first time the code goes through loadConfigFiles() the value
+of g_confFileModTime will be set to the highest mtime found, which will
+work correctly even if that "highest" value is the artifical (time_t)0
+found in these special readonly filesystems.
+
+Signed-off-by: Simo Sorce <simo redhat com>
+---
+ src/lib/gssapi/mechglue/g_initialize.c | 9 ++++++---
+ 1 file changed, 6 insertions(+), 3 deletions(-)
+
+diff --git a/src/lib/gssapi/mechglue/g_initialize.c b/src/lib/gssapi/mechglue/g_initialize.c
+index b26262d692..3582145319 100644
+--- a/src/lib/gssapi/mechglue/g_initialize.c
++++ b/src/lib/gssapi/mechglue/g_initialize.c
+@@ -93,7 +93,7 @@ static void free_mechSet(void);
+ static gss_mech_info g_mechList = NULL;
+ static gss_mech_info g_mechListTail = NULL;
+ static k5_mutex_t g_mechListLock = K5_MUTEX_PARTIAL_INITIALIZER;
+-static time_t g_confFileModTime = (time_t)0;
++static time_t g_confFileModTime = (time_t)-1;
+ static time_t g_confLastCall = (time_t)0;
+ 
+ static gss_OID_set_desc g_mechSet = { 0, NULL };
+@@ -467,11 +467,13 @@ load_if_changed(const char *pathname, time_t last, time_t *highest)
+       time_t mtime;
+ 
+       mtime = check_link_mtime(pathname, &mtime);
++        if (mtime == (time_t)-1 && last == (time_t)-1)
++            mtime = 0;
+       if (mtime == (time_t)-1)
+               return;
+       if (mtime > *highest)
+               *highest = mtime;
+-      if (mtime > last)
++      if (mtime > last || last == (time_t)-1)
+               loadConfigFile(pathname);
+ }
+ 
+@@ -522,7 +524,8 @@ updateMechList(void)
+ 
+ #if defined(_WIN32)
+       time_t lastConfModTime = getRegConfigModTime(MECH_KEY);
+-      if (g_confFileModTime >= lastConfModTime)
++      if (g_confFileModTime >= lastConfModTime &&
++            g_confFileModTime != (time_t)-1)
+               return;
+       g_confFileModTime = lastConfModTime;
+       loadConfigFromRegistry(HKEY_CURRENT_USER, MECH_KEY);