stdstream support

test/stdstream.sh

@@ -0,0 +1,27 @@
+#!/bin/sh
+
+TRY_TOP="${TRY_TOP:-$(git rev-parse --show-toplevel --show-superproject-working-tree 2>/dev/null || echo "${0%/*}")}"
+TRY="$TRY_TOP/try"
+
+cmdfile="$(mktemp)"
+
+cat > "$cmdfile" <<'EOF'
+read x < /dev/stdin
+echo $((x * 2)) > /dev/stdout
+echo $((x * 3)) > /dev/stderr
+
+EOF
+
+chmod +x "$cmdfile"
+
+# test stdout
+result=$(echo 5 | "$TRY" "$cmdfile" 2>/dev/null)
+expected=$(echo 5 | sh "$cmdfile" 2>/dev/null)
+
+[ "$result" = "$expected" ] || exit 1
+
+# test stdout + stderr
+result=$(echo 5 | "$TRY" "$cmdfile" 2>&1)
+
+# using grep because stdout also includes try err/warns
+echo "$result" | grep 15 > /dev/null

try

@@ -249,6 +249,10 @@ unshare --root="$SANDBOX_DIR/temproot" /bin/sh "$chroot_executable"
 exitcode="$?"
 
 # unmount the devices
+rm "$sandbox_dir/temproot/dev/stdin"
+rm "$sandbox_dir/temproot/dev/stdout"
+rm "$sandbox_dir/temproot/dev/stderr"
+
 unmount_devices "$SANDBOX_DIR"
 
 exit $exitcode
@@ -262,6 +266,9 @@ unset START_DIR SANDBOX_DIR UNION_HELPER DIRS_AND_MOUNTS TRY_EXIT_STATUS
 unset script_to_execute chroot_executable try_mount_log
 
 mount -t proc proc /proc &&
+ln -s /proc/self/fd/0 /dev/stdin &&
+ln -s /proc/self/fd/1 /dev/stdout &&
+ln -s /proc/self/fd/2 /dev/stderr &&
 cd "$START_DIR" &&
 . "$script_to_execute"
 EOF