[groff] 48/50: [tests]: Improve preconv /dev/stdin robustness.

[G. Branden Robinson]

gbranden pushed a commit to branch master
in repository groff.

commit 8ef4d5c5c9dd081576ecfaeb42fd101e1757b520
Author: G. Branden Robinson <g.branden.robinson@gmail.com>
AuthorDate: Sat May 21 09:03:50 2022 -0500

    [tests]: Improve preconv /dev/stdin robustness.
    
    * src/preproc/preconv/tests/do-not-seek-the-unseekable.sh: Skip a check
      if /dev/stdin is not a character special device.
---
 ChangeLog                                               | 5 +++++
 src/preproc/preconv/tests/do-not-seek-the-unseekable.sh | 5 +++++
 2 files changed, 10 insertions(+)

diff --git a/ChangeLog b/ChangeLog
index 48c8e840..dba981d3 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2022-05-21  G. Branden Robinson <g.branden.robinson@gmail.com>
+
+       * src/preproc/preconv/tests/do-not-seek-the-unseekable.sh: Skip
+       a check if /dev/stdin is not a character special device.
+
 2022-05-21  G. Branden Robinson <g.branden.robinson@gmail.com>
 
        * m4/groff.m4 (GROFF_PDFTOOLS): Rename this...
diff --git a/src/preproc/preconv/tests/do-not-seek-the-unseekable.sh 
b/src/preproc/preconv/tests/do-not-seek-the-unseekable.sh
index bf25b060..3cb36404 100755
--- a/src/preproc/preconv/tests/do-not-seek-the-unseekable.sh
+++ b/src/preproc/preconv/tests/do-not-seek-the-unseekable.sh
@@ -39,6 +39,11 @@ echo "testing seekability of file operand '-'" >&2
 output=$(printf '' | "$preconv" -d - 2>&1)
 echo "$output" | grep -q "stream is not seekable" || wail
 
+# /dev/stdin might not exist in a chroot.  Or, if it's not (a symbolic
+# link to) a character special device, the next test will not be valid.
+test -z "$fail"
+test -c /dev/stdin || exit 77 # skip
+
 echo "testing seekability of standard input stream" >&2
 output=$(printf '' | "$preconv" -d /dev/stdin 2>&1)
 echo "$output" | grep -q "stream is not seekable" || wail