[logfile] check for truncated files

TESTS_ENVIRONMENT.in

@@ -26,6 +26,9 @@ test_file_base=`basename $1`
 # The current test number for shell based tests.
 test_num=0
 
+lnav_test="${top_builddir}/src/lnav-test"
+export lnav_test
+
 ## BEGIN Functions
 
 LAST_TEST=""

src/lnav.cc

@@ -2967,6 +2967,7 @@ static void watch_logfile(string filename, int fd, bool required)
                 /* It's a new file, load it in. */
                 logfile *lf = new logfile(filename, fd);
 
+                log_info("loading new file: %s", filename.c_str());
                 lnav_data.ld_files.push_back(lf);
                 lnav_data.ld_text_source.tss_files.push_back(lf);
                 break;
@@ -3048,8 +3049,6 @@ static bool rescan_files(bool required)
         logfile *lf = *file_iter;
 
         if (!lf->exists() || lf->is_closed()) {
-            std::list<logfile *>::iterator tss_iter;
-
             log_info("file has been deleted/closed -- %s",
                     lf->get_filename().c_str());
             lnav_data.ld_file_names.erase(make_pair(lf->get_filename(), lf->get_fd()));

src/logfile.cc

@@ -122,7 +122,8 @@ bool logfile::exists(void) const
     }
 
     return this->lf_stat.st_dev == st.st_dev &&
-           this->lf_stat.st_ino == st.st_ino;
+           this->lf_stat.st_ino == st.st_ino &&
+           this->lf_stat.st_size <= st.st_size;
 }
 
 void logfile::set_format_base_time(log_format *lf)

test/test_cmds.sh

@@ -1,8 +1,5 @@
 #! /bin/bash
 
-lnav_test="${top_builddir}/src/lnav-test"
-
-
 run_test ${lnav_test} -n \
     -c ":adjust-log-time 2010-01-01T00:00:00" \
     ${test_dir}/logfile_access_log.0

test/test_logfile.sh

@@ -187,3 +187,15 @@ check_output "glog_log level interpreted incorrectly?" <<EOF
 0x03
 0x05
 EOF
+
+cp ${srcdir}/logfile_syslog.0 truncfile.0
+
+run_test ${lnav_test} -n \
+    -c ";update syslog_log set log_mark = 1 where log_line = 1" \
+    -c ":write-to truncfile.0" \
+    -c ":goto 1" \
+    truncfile.0
+
+check_output "truncated log file not detected" <<EOF
+Nov  3 09:23:38 veridian automount[16442]: attempting to mount entry /auto/opt
+EOF