Resolves: #2121694 - fix recognition of compressed empty files

file-5.33-fix-compression.patch

@@ -0,0 +1,45 @@
+diff --git a/src/compress.c b/src/compress.c
+index ba1e3d7..6846d66 100644
+--- a/src/compress.c
++++ b/src/compress.c
+@@ -932,23 +932,23 @@ uncompressbuf(int fd, size_t bytes_max, size_t method, const unsigned char *old,
+ 	rv = OKDATA;
+ 	r = sread(fdp[STDOUT_FILENO][0], *newch, bytes_max, 0);
+ 	if (r <= 0) {
+-		DPRINTF("Read stdout failed %d (%s)\n", fdp[STDOUT_FILENO][0],
+-		    r != -1 ? strerror(errno) : "no data");
+-
+-		rv = ERRDATA;
+-		if (r == 0 &&
+-		    (r = sread(fdp[STDERR_FILENO][0], *newch, bytes_max, 0)) > 0)
+-		{
+-			r = filter_error(*newch, r);
+-			goto ok;
+-		}
+-		free(*newch);
+-		if  (r == 0)
+-			rv = makeerror(newch, n, "Read failed, %s",
+-			    strerror(errno));
+-		else
+-			rv = makeerror(newch, n, "No data");
+-		goto err;
++		if (r < 0) {
++                        rv = ERRDATA;
++                        DPRINTF("Read stdout failed %d (%s)\n", fdp[STDOUT_FILENO][0],
++                                strerror(errno));
++                        goto err;
++                } else if ((r = sread(fdp[STDERR_FILENO][0], *newch, bytes_max, 0)) > 0){
++                        rv = ERRDATA;
++                        r = filter_error(*newch, r);
++                        goto ok;
++                }
++                if (r == 0)
++                        goto ok;
++                free(*newch);
++                rv = ERRDATA;
++                rv = makeerror(newch, n, "Read stderr failed, %s",
++                    strerror(errno));
++                goto err;
+ 	}
+ ok:
+ 	*n = r;

file.spec

@@ -15,7 +15,7 @@
 Summary: Utility for determining file types
 Name: file
 Version: 5.39
-Release: 8%{?dist}
+Release: 9%{?dist}
 License: BSD
 Source0: http://ftp.astron.com/pub/file/file-%{version}.tar.gz
 
@@ -32,6 +32,9 @@ Patch3: file-5.39-CLOEXEC.patch
 # Upstream commit 7d9b0f0d853957ad88dae0f440fecd58d2740ca7 (#1963892)
 Patch4: file-5.40-magic-python.patch
 
+# not yet upstream
+Patch5: file-5.33-fix-compression.patch
+
 URL: https://www.darwinsys.com/file/
 Requires: file-libs%{?_isa} = %{version}-%{release}
 BuildRequires: zlib-devel
@@ -210,6 +213,10 @@ cd %{py3dir}
 %endif
 
 %changelog
+* Wed Aug 17 2022 Vincent Mihalkovic <vmihalko@redhat.com> - 5.39-9
+- fix recognition (src/compress.c) of compressed empty files
+  Resolves: #2121694
+
 * Mon Aug 09 2021 Mohan Boddu <mboddu@redhat.com> - 5.39-8
 - Rebuilt for IMA sigs, glibc 2.34, aarch64 flags
   Related: rhbz#1991688