doc: prepare for asciidoc based specification
diff --git a/docs/osmo-gsm-manuals-dir.sh b/docs/osmo-gsm-manuals-dir.sh
new file mode 100755
index 0000000..d080bc7
--- /dev/null
+++ b/docs/osmo-gsm-manuals-dir.sh
@@ -0,0 +1,26 @@
+#!/bin/sh -e
+# Find OSMO_GSM_MANUALS_DIR and print it to stdout. Print where it was taken from to stderr.
+
+# Find it in env, pkg-conf and ../../osmo-gsm-manuals
+RET="$OSMO_GSM_MANUALS_DIR"
+if [ -n "$RET" ]; then
+ RET="$(realpath $RET)"
+ echo "OSMO_GSM_MANUALS_DIR: $RET (from env)" >&2
+else
+ RET="$(pkg-config osmo-gsm-manuals --variable=osmogsmmanualsdir 2>/dev/null || true)"
+ if [ -n "$RET" ]; then
+ echo "OSMO_GSM_MANUALS_DIR: $RET (from pkg-conf)" >&2
+ else
+ RET="$(realpath $(realpath $(dirname $0))/../../osmo-gsm-manuals)"
+ echo "OSMO_GSM_MANUALS_DIR: $RET (fallback)" >&2
+ fi
+fi
+
+# Print the result or error message
+if [ -d "$RET" ]; then
+ echo "$RET"
+else
+ echo "ERROR: OSMO_GSM_MANUALS_DIR does not exist!" >&2
+ echo "Install osmo-gsm-manuals or set OSMO_GSM_MANUALS_DIR." >&2
+ exit 1
+fi