gitlog-to-changelog: give better diagnostic for failed pipe-open

* build-aux/gitlog-to-changelog: Improve error message: suggest
that the version of Git may be too old.

diff --git a/ChangeLog b/ChangeLog
index a09e688bbb36feafcf982f494cc1277d03aff7bb..5e303c75ad910cd869749078895e928eda2fd75c 100644 (file)
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2008-08-18  Ben Pfaff  <blp@gnu.org>
+
+       gitlog-to-changelog: give better diagnostic for failed pipe-open
+       * build-aux/gitlog-to-changelog: Improve error message: suggest
+       that the version of Git may be too old.
+
 2008-08-18  Simon Josefsson  <simon@josefsson.org>
 
        * m4/autobuild.m4: Use TZ=UTC to avoid time zone complexity.  Use

diff --git a/build-aux/gitlog-to-changelog b/build-aux/gitlog-to-changelog
index 3efdb6ddbb0eccba4561b4c0f864ab754a9b4d36..50b1b2fc895eef365f39c8825d047883411b7990 100755 (executable)
--- a/build-aux/gitlog-to-changelog
+++ b/build-aux/gitlog-to-changelog
@@ -1,7 +1,7 @@
 #!/usr/bin/perl
 # Convert git log output to ChangeLog format.
 
-my $VERSION = '2008-02-10 10:03'; # UTC
+my $VERSION = '2008-08-19 05:01'; # UTC
 # The definition above must lie within the first 8 lines in order
 # for the Emacs time-stamp write hook (at end) to update it.
 # If you change this file with Emacs, please let the write hook
@@ -106,7 +106,8 @@ sub quoted_cmd(@)
   my @cmd = (qw (git log --log-size), "--since=$since_date",
              '--pretty=format:%ct  %an  <%ae>%n%n%s%n%b%n');
   open PIPE, '-|', @cmd
-    or die "$ME: failed to run `". quoted_cmd (@cmd) ."': $!\n";
+    or die ("$ME: failed to run `". quoted_cmd (@cmd) ."': $!\n"
+            . "(Is your Git too old?  Version 1.5.1 or later is required.)\n");
 
   my $prev_date_line = '';
   while (1)