From dbef31038ef7906e148e8893f060f844e4e71427 Mon Sep 17 00:00:00 2001
From: rillig <rillig@pkgsrc.org>
Date: Fri, 4 Aug 2006 05:55:18 +0000
Subject: Moved the locking code from bsd.pkg.mk into its own file. Where here,
 added a more detailed header comment and fixed a bug concerning lockdir.

---
 mk/internal/locking.mk | 82 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 82 insertions(+)
 create mode 100644 mk/internal/locking.mk

(limited to 'mk/internal')

diff --git a/mk/internal/locking.mk b/mk/internal/locking.mk
new file mode 100644
index 00000000000..7a0bed0c484
--- /dev/null
+++ b/mk/internal/locking.mk
@@ -0,0 +1,82 @@
+# $NetBSD: locking.mk,v 1.1 2006/08/04 05:55:18 rillig Exp $
+#
+
+# acquire-lock and release-lock are two .USE macro targets that aquire
+# and release coarse-grained locks. There are two areas of pkgsrc that
+# can be locked: The WRKDIR of a specific package or the LOCALBASE.
+# Which of those is locked depends on the name of the target where the
+# {acquire,release}-lock macro is used. If it contains -install-, as for
+# example acquire-install-lock, LOCALBASE is locked. Otherwise, WRKDIR
+# is locked.
+#
+# 
+
+_WRKDIR_LOCKFILE=	${WRKDIR}/.lockfile
+_PREFIX_LOCKFILE=	${PKG_DBDIR}/.lockfile
+_GET_LOCKFILE_CMD= \
+	case ${.TARGET} in						\
+	*-install-*)	lockfile=${_PREFIX_LOCKFILE};;			\
+	*)		lockfile=${_WRKDIR_LOCKFILE};;			\
+	esac
+
+acquire-lock: .USE
+.if ${PKGSRC_LOCKTYPE} == "none"
+	@${DO_NADA}
+.else
+	@if ${TEST} ! -x ${SHLOCK:Q}""; then				\
+		${ERROR_MSG} "The ${SHLOCK:Q} utility does not exist, and is necessary for locking."; \
+		${ERROR_MSG} "Please \""${MAKE:Q}" install\" in ../../pkgtools/shlock."; \
+		exit 1;							\
+	fi
+.  if !defined(OBJHOSTNAME)
+	@${ERROR_MSG} "PKGSRC_LOCKTYPE needs OBJHOSTNAME defined.";	\
+	exit 1
+.  endif
+	${_PKG_SILENT}${_PKG_DEBUG}set -e;				\
+	${_GET_LOCKFILE_CMD};						\
+	ppid=`${PS} -p $$$$ -o ppid | ${AWK} 'NR == 2 { print $$1 }'`;	\
+	if ${TEST} -z "$$ppid"; then					\
+		${ERROR_MSG} "No parent process ID found.";		\
+		exit 1;							\
+	fi;								\
+	while ${TRUE}; do						\
+		if ${TEST} -f /var/run/dmesg.boot -a -f "$$lockfile"; then \
+			rebooted=`${FIND} /var/run/dmesg.boot -newer "$$lockfile" -print`; \
+			if ${TEST} -n "$$rebooted"; then		\
+				${STEP_MSG} "Removing stale $$lockfile"; \
+				${RM} -f "$$lockfile";			\
+			fi;						\
+		fi;							\
+		lockdir=`echo "$$lockfile" | sed "s,/[^/]*\$$,,"`;	\
+		${MKDIR} "$$lockdir";					\
+		if ${SHLOCK} -f "$$lockfile" -p $$ppid; then		\
+			break;						\
+		fi;							\
+		lockpid=`${CAT} "$$lockfile"`;				\
+		case ${PKGSRC_LOCKTYPE:Q}"" in				\
+		once)	${ERROR_MSG} "Lock is held by pid $$lockpid";	\
+			exit 1;						\
+			;;						\
+		sleep)	${STEP_MSG} "Lock is held by pid $$lockpid";	\
+			${SLEEP} ${PKGSRC_SLEEPSECS};			\
+			;;						\
+		esac;							\
+	done;								\
+	if ${PKG_VERBOSE:D${TRUE}:U${FALSE}}; then			\
+		lockpid=`${CAT} "$$lockfile"`;				\
+		${STEP_MSG} "Lock acquired for \`\`${.TARGET:S/^acquire-//:S/-lock$//}'' on behalf of process $$lockpid"; \
+	fi
+.endif
+
+release-lock: .USE
+.if ${PKGSRC_LOCKTYPE} == "none"
+	@${DO_NADA}
+.else
+	${_PKG_SILENT}${_PKG_DEBUG} set -e;				\
+	${_GET_LOCKFILE_CMD};						\
+	if ${PKG_VERBOSE:D${TRUE}:U${FALSE}}; then			\
+		lockpid=`${CAT} "$$lockfile"`;				\
+		${STEP_MSG} "Lock released for \`\`${.TARGET:S/^release-//:S/-lock$//}'' on behalf of process $$lockpid"; \
+	fi;								\
+	${RM} -f "$$lockfile"
+.endif
-- 
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