Bug#801186: at does not catch some errors while writing job file

[Zdenek Salvet]

Package: at
Version: 3.1.16-1
Severity: normal
Tags: upstream patch

writefile() does not fflush output file stream before
checking for errors, at often creates empty job files
when there is no disk space available in spool directory

Fix:
--- at-3.1.13.orig/at.c
+++ at-3.1.13/at.c
@@ -477,6 +493,7 @@
        fprintf(stderr, "<EOT>\n");
     }
     fprintf(fp, "\n");
+    fflush(fp);
     if (ferror(fp))
        panic("Output error");


-- System Information:
Debian Release: 8.2
  APT prefers stable-updates
  APT policy: (860, 'stable-updates'), (850, 'stable')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 3.16.0-4-amd64 (SMP w/2 CPU cores)
Locale: LANG=C, LC_CTYPE=C (charmap=ANSI_X3.4-1968)
Shell: /bin/sh linked to /bin/bash
Init: systemd (via /run/systemd/system)

Versions of packages at depends on:
ii  init-system-helpers  1.22
ii  libc6                2.19-18+deb8u1
ii  libpam-runtime       1.1.8-3.1
ii  libpam0g             1.1.8-3.1
ii  lsb-base             4.1+Debian13+nmu1

Versions of packages at recommends:
ii  sendmail-bin [mail-transport-agent]  8.14.4-8

at suggests no packages.

-- Configuration Files:
/etc/at.deny [Errno 13] Permission denied: u'/etc/at.deny'

-- no debconf information