abuild: exclude provides for commans with @

the '@' characted serves as a repository separator (eg. pkg@repo) so we
should not add a cmd: provides for binaries having this character.

This avoids conflicts with for example `who` from coreutils and `who@`
from ucspi-tpc6.

fixes https://gitlab.alpinelinux.org/alpine/abuild/-/issues/10074

abuild.in

@@ -1299,6 +1299,13 @@ prepare_command_provides() {
 		if ! [ -x "$i" ] || ! [ -f "$i" ]; then
 			continue
 		fi
+		# exclude any provides: lines for commands that has '@' because '@'
+		# is used as seperator between command name and repository. This
+		# avoids potential conflicts
+		# ref: https://gitlab.alpinelinux.org/alpine/abuild/-/issues/10074
+		case "$i" in
+			*@*) continue;;
+		esac
 		local f=${i##*/}
 		echo $f >> "$controldir"/.provides-command
 	done

tests/abuild_test

@@ -1056,6 +1056,7 @@ abuild_command_provides_body() {
 			mkdir -p "\$pkgdir/usr/bin"
 			printf "%s\n" '#!/bin/sh' >"\$pkgdir/usr/bin/foo"
 			chmod +x "\$pkgdir/usr/bin/foo"
+			cp -a "\$pkgdir/usr/bin/foo" "\$pkgdir/usr/bin/foo@"
 			mkdir -p "\$pkgdir/usr/bin/dir/"
 		}
 	EOF
@@ -1063,6 +1064,7 @@ abuild_command_provides_body() {
 
 	atf_check \
 		-o match:"provides = cmd:foo=1.0-r0" \
+		-o not-match:"provides = cmd:foo@=1.0-r0" \
 		-o not-match:"provides = cmd:dir=1.0-r0" \
 		grep '^provides = ' pkg/.control.testprovides/.PKGINFO
 }