From 32aa2827d8de16879bb4e92c1235ef5b10f23e2c Mon Sep 17 00:00:00 2001
From: P. J. McDermott <pj@pehjota.net>
Date: Sun, 24 May 2015 03:30:41 -0400
Subject: cmd/build: Accept block device as root

---
diff --git a/lib/cmd/build.sh b/lib/cmd/build.sh
index 32dca26..d22fa1e 100644
--- a/lib/cmd/build.sh
+++ b/lib/cmd/build.sh
@@ -18,6 +18,7 @@
 # along with the ProteanOS Development Kit.  If not, see
 # <http://www.gnu.org/licenses/>.
 
+use block
 use profile
 use session
 use rand
@@ -31,6 +32,7 @@ cmd_build_build_deps=
 cmd_build_main()
 {
 	local root=
+	local dev=
 	local opkbuild_optstring=
 	local arch=
 	local plat=
@@ -43,9 +45,16 @@ cmd_build_main()
 	fi
 
 	root="${1}"
-	cmd_build_root="${root}"
 	shift 1
 
+	dev=''
+	if is_block "${root}"; then
+		dev="${root}"
+		root="$(block_mount "${dev}")"
+	fi
+
+	cmd_build_root="${root}"
+
 	opkbuild_optstring="$(cat "${root}/usr/share/opkbuild/optstring")"
 	arch="$(cat "${root}/etc/proteanos_arch")"
 	plat="$(cat "${root}/etc/proteanos_plat")"
@@ -91,6 +100,10 @@ cmd_build_main()
 	cmd_build_fini
 
 	session_end
+
+	if [ "x${dev}" != 'x' ]; then
+		block_umount "${root}"
+	fi
 }
 
 cmd_build_make_deps_pkg()
diff --git a/man/prokit-build.8in b/man/prokit-build.8in
index 77ed078..5dc25de 100644
--- a/man/prokit-build.8in
+++ b/man/prokit-build.8in
@@ -5,12 +5,15 @@
 prokit-build \- Build a package
 
 .SH SYNOPSIS
-\fBprokit build\fP \fIroot-dir\fP [\fIoption\fP ...] \fIpkg-dir\fP
+\fBprokit build\fP \fIroot\fP [\fIoption\fP ...] \fIpkg-dir\fP
 
 .SH DESCRIPTION
 \fBprokit build\fP runs \fBopkbuild\fP to build a package in an isolated file
 system environment, temporarily installing any missing build dependencies.
 .P
+If \fIroot\fP is a block device node, the block device is mounted and
+\fBopkbuild\fP is run in its file system.
+.P
 \fIoption\fPs are \fBopkbuild\fP options.  Run \fIprokit build -h .\fP for more
 information.
 .P
--
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