The branch main has been updated by wosch:

URL: 
https://cgit.FreeBSD.org/src/commit/?id=37be4197f72ae3a61bd5e93d2ebdc9bd6d09ed21

commit 37be4197f72ae3a61bd5e93d2ebdc9bd6d09ed21
Author:     Wolfram Schneider <[email protected]>
AuthorDate: 2024-05-20 16:02:21 +0000
Commit:     Wolfram Schneider <[email protected]>
CommitDate: 2024-05-20 16:02:21 +0000

    man: the exists function needs to validate the first parameter
    
    This fixes an issue with the ".so " macro for FreeBSD
    ports manual pages.
    
    PR: 275978
    Reported by:    Jamie Landeg-Jones <[email protected]>
    MFC after:      1 week
    
    Differential Revision:  https://reviews.freebsd.org/D45231 (discussion)
---
 usr.bin/man/man.sh | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/usr.bin/man/man.sh b/usr.bin/man/man.sh
index 03803b777463..af638527f497 100755
--- a/usr.bin/man/man.sh
+++ b/usr.bin/man/man.sh
@@ -201,6 +201,10 @@ decho() {
 # Returns true if glob resolves to a real file and store the first
 # found filename in the variable $found
 exists() {
+       if [ -z "$1" ]; then
+               return 1
+       fi
+
        local IFS
 
        # Don't accidentally inherit callers IFS (breaks perl manpages)

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