[PATCH openbmc 1/6] create obmc-phosphor-initfs
OpenBMC Patches
openbmc-patches at stwcx.xyz
Thu Jan 21 10:10:15 AEDT 2016
From: "Milton D. Miller II" <miltonm at us.ibm.com>
This recipe holds the key scripts for an initramfs image. Written in
sh to run with busybox, these three scripts handle mounting, unmounting,
and updating a set of mtd partitions to form a read/write overlay on a
read/only compressed base.
The init script will mount the base sysfs, proc, and devtmpfs as well
as run. It copies itself to run/initramfs to create the shutdown and
update environment. The shutdown script will unmount the remaining
nodev and root filesystems from oldroot where systemd-shutdown pivots
the old file system, then looks for image- files an if found invokes
upate otherwise it performs the final reboot, powerdown, or kexec, or
halt. The update script will attempt to mount the read/write overlay
and preserve selected files and directories based on a whitelist.
It then unmounts and writes all image files to their named mtd partition
using flashcp, mounts and restores the saved files, and finally
unmounts the fs and performs the final reboot or halt etc.
---
meta-phosphor/classes/obmc-phosphor-initfs.bbclass | 4 +
.../obmc-phosphor-initfs/files/obmc-init.sh | 78 ++++++++++++++++
.../obmc-phosphor-initfs/files/obmc-shutdown.sh | 55 +++++++++++
.../obmc-phosphor-initfs/files/obmc-update.sh | 102 +++++++++++++++++++++
.../obmc-phosphor-initfs/files/whitelist | 8 ++
.../obmc-phosphor-initfs/obmc-phosphor-init.bb | 28 ++++++
.../common/recipes-phosphor/skeleton/skeleton.bb | 2 +-
7 files changed, 276 insertions(+), 1 deletion(-)
create mode 100644 meta-phosphor/classes/obmc-phosphor-initfs.bbclass
create mode 100644 meta-phosphor/common/recipes-phosphor/obmc-phosphor-initfs/files/obmc-init.sh
create mode 100644 meta-phosphor/common/recipes-phosphor/obmc-phosphor-initfs/files/obmc-shutdown.sh
create mode 100755 meta-phosphor/common/recipes-phosphor/obmc-phosphor-initfs/files/obmc-update.sh
create mode 100644 meta-phosphor/common/recipes-phosphor/obmc-phosphor-initfs/files/whitelist
create mode 100644 meta-phosphor/common/recipes-phosphor/obmc-phosphor-initfs/obmc-phosphor-init.bb
diff --git a/meta-phosphor/classes/obmc-phosphor-initfs.bbclass b/meta-phosphor/classes/obmc-phosphor-initfs.bbclass
new file mode 100644
index 0000000..de7923e
--- /dev/null
+++ b/meta-phosphor/classes/obmc-phosphor-initfs.bbclass
@@ -0,0 +1,4 @@
+# Common code for recipes that implement Phosphor OpenBMC filesystem
+
+RPROVIDES_${PN} += "obmc-phosphor-initfs"
+PROVIDES += "obmc-phosphor-initfs"
diff --git a/meta-phosphor/common/recipes-phosphor/obmc-phosphor-initfs/files/obmc-init.sh b/meta-phosphor/common/recipes-phosphor/obmc-phosphor-initfs/files/obmc-init.sh
new file mode 100644
index 0000000..08b62e8
--- /dev/null
+++ b/meta-phosphor/common/recipes-phosphor/obmc-phosphor-initfs/files/obmc-init.sh
@@ -0,0 +1,78 @@
+#!/bin/sh
+
+rodir=run/initramfs/ro
+rwdir=run/initramfs/rw
+upper=$rwdir/cow
+work=$rwdir/work
+
+cd /
+mkdir -p sys proc dev run
+mount dev dev -tdevtmpfs
+mount sys sys -tsysfs
+mount proc proc -tproc
+if ! grep run proc/mounts
+then
+ mount tmpfs run -t tmpfs -o mode=755,nodev
+fi
+
+mkdir -p $rodir $rwdir
+
+cp -rp init shutdown update whitelist bin sbin usr lib etc var run/initramfs
+
+# To start a interactive shell with job control at this point, run
+# getty 38400 ttyS4
+
+findmtd() {
+ m=$(grep -xl "$1" /sys/class/mtd/*/name)
+ m=${m%/name}
+ m=${m##*/}
+ echo $m
+}
+
+rofs=$(findmtd rofs)
+rwfs=$(findmtd rwfs)
+
+rofst=squashfs
+rwfst=ext4
+
+echo rofs = $rofs $rofst rwfs = $rwfs $rwfst
+
+if grep -w debug-init-sh /proc/cmdline ||
+ ! mount -o rw /dev/mtdblock${rwfs#mtd} $rwdir -t $rwfst
+then
+ echo Please mount the rw file system on $rwdir from this shell
+ while ! sulogin && ! test -f /takeover
+ do
+ echo getty failed, retrying
+ done
+fi
+
+# Touch /takeover in the above getty to become pid 1
+if test -e /takeover
+then
+ export PS1=init#\
+ exec /bin/sh
+fi
+
+mount -o ro /dev/mtdblock${rofs#mtd} $rodir -t $rofst
+
+rm -rf $work
+mkdir -p $upper
+mkdir -p $work
+
+mount -t overlay -o lowerdir=$rodir,upperdir=$upper,workdir=$work cow /root
+
+if ! chroot /root /bin/sh -c exit
+then
+ echo 'chroot test failed; invoking emergency shell.'
+ PS1=rescue#\ sulogin
+fi
+
+for f in sys dev proc run
+do
+ mount --move $f root/$f
+done
+
+# switch_root /root /sbin/init
+exec chroot /root /sbin/init
+
diff --git a/meta-phosphor/common/recipes-phosphor/obmc-phosphor-initfs/files/obmc-shutdown.sh b/meta-phosphor/common/recipes-phosphor/obmc-phosphor-initfs/files/obmc-shutdown.sh
new file mode 100644
index 0000000..85fd1e9
--- /dev/null
+++ b/meta-phosphor/common/recipes-phosphor/obmc-phosphor-initfs/files/obmc-shutdown.sh
@@ -0,0 +1,55 @@
+#!/bin/sh
+
+echo shutdown: "$@"
+
+export PS1=shutdown-sh#\
+# exec bin/sh
+
+if [ ! -e /proc/mounts ]
+then
+ mkdir -p /proc
+ mount proc proc -tproc
+ umount_proc=1
+else
+ umount_proc=
+fi
+
+# remove an empty oldroot, that means we are not invoked from systemd-shutdown
+rmdir /oldroot 2>/dev/null
+
+set -x
+for f in $( awk '/oldroot/ { print $2 }' < /proc/mounts | sort -r )
+do
+ umount $f
+done
+set +x
+
+
+if test -x /update && ls image-* > /dev/null 2>&1
+then
+ exec /update ${1+"$@"}
+fi
+
+echo Remaining mounts:
+cat /proc/mounts
+
+test "umount_proc" && umount /proc && rmdir /proc
+
+
+
+# Execute the command systemd told us to ...
+if test -d /oldroot && test "$1"
+then
+ if test "$1" -eq kexec
+ then
+ $1 -f -e
+ else
+ $1 -f
+ fi
+fi
+
+
+echo "Execute ${1-reboot} -f if all unounted ok, or exec /init"
+
+export PS1=shutdown-sh#\
+exec /bin/sh
diff --git a/meta-phosphor/common/recipes-phosphor/obmc-phosphor-initfs/files/obmc-update.sh b/meta-phosphor/common/recipes-phosphor/obmc-phosphor-initfs/files/obmc-update.sh
new file mode 100755
index 0000000..9606459
--- /dev/null
+++ b/meta-phosphor/common/recipes-phosphor/obmc-phosphor-initfs/files/obmc-update.sh
@@ -0,0 +1,102 @@
+#!/bin/sh
+
+echo update: "$@"
+
+export PS1=update-sh#\
+# exec /bin/sh
+
+cd /
+if ! test -r /proc/mounts || ! test -f /proc/mounts
+then
+ mkdir -p /proc
+ mount -t proc proc proc
+fi
+if ! test -d /sys/class
+then
+ mkdir -p /sys
+ mount -t sysfs sys sys
+fi
+if ! test -c /dev/null
+then
+ mkdir -p /dev
+ mount -t devtmpfs dev dev
+fi
+while grep mtd /proc/mounts
+do
+ echo 1>&2 "Error: A mtd device is mounted."
+ sulogin
+ # exec /bin/sh
+done
+
+findmtd() {
+ m=$(grep -xl "$1" /sys/class/mtd/*/name)
+ m=${m%/name}
+ m=${m##*/}
+ echo $m
+}
+
+rofs=$(findmtd rofs)
+rwfs=$(findmtd rwfs)
+
+rofst=squahsfs
+rwfst=ext4
+
+if test -n "$rwfs" && test -s whitelist
+then
+
+ mkdir -p rw
+ mount /dev/mtdblock${rwfs#mtd} rw -oro -t $rwfst
+
+ while read f
+ do
+ if ! test -e rw/cow/$f
+ then
+ continue
+ fi
+ d="save/cow/$f"
+ mkdir -p "${d%/*}"
+ cp -rp rw/cow/$f "${d%/*}/"
+ done < whitelist
+
+ umount rw
+fi
+
+
+for f in image-*
+do
+ m=$(findmtd ${f#image-})
+ if test -z "$m"
+ then
+ echo 1>&2 "Unable to find mtd partiton for $f"
+ exec /bin/sh
+ fi
+
+ echo "Updating ${f#image-}"
+ # flasheraseall /dev/$m && dd if=$f of=/dev/$m
+ flashcp -v $f /dev/$m
+done
+
+
+if test -d save/cow
+then
+ mount /dev/mtdblock${rwfs#mtd} rw -o rw -t $rwfst
+ cp -rp save/cow/. rw/cow/
+ umount rw
+fi
+
+# Execute the command systemd told us to ...
+if test -d /oldroot && test -x "/sbin/$1" && test -f "/sbin/$1"
+then
+ if test "$1" -eq kexec
+ then
+ /sbin/$1 -f -e
+ else
+ /sbin/$1 -f
+ fi
+fi
+
+
+echo "Execute ${1-reboot} -f if all is ok"
+
+export PS1=update-sh#\
+exec /bin/sh
diff --git a/meta-phosphor/common/recipes-phosphor/obmc-phosphor-initfs/files/whitelist b/meta-phosphor/common/recipes-phosphor/obmc-phosphor-initfs/files/whitelist
new file mode 100644
index 0000000..80f9c81
--- /dev/null
+++ b/meta-phosphor/common/recipes-phosphor/obmc-phosphor-initfs/files/whitelist
@@ -0,0 +1,8 @@
+/etc/dropbear/dropbear_rsa_host_key
+/etc/systemd/network
+/etc/resolv.conf
+/etc/machine-id
+/etc/passwd
+/etc/group
+/etc/shadow
+/etc/gshadow
diff --git a/meta-phosphor/common/recipes-phosphor/obmc-phosphor-initfs/obmc-phosphor-init.bb b/meta-phosphor/common/recipes-phosphor/obmc-phosphor-initfs/obmc-phosphor-init.bb
new file mode 100644
index 0000000..81ab8f0
--- /dev/null
+++ b/meta-phosphor/common/recipes-phosphor/obmc-phosphor-initfs/obmc-phosphor-init.bb
@@ -0,0 +1,28 @@
+SUMMARY = "Phosphor OpenBMC pre-init scripts"
+DESCRIPTION = "Phosphor OpenBMC filesytem mount reference implementation."
+PR = "r1"
+
+inherit obmc-phosphor-license
+inherit obmc-phosphor-initfs
+
+S = "${WORKDIR}"
+SRC_URI += "file://obmc-init.sh"
+SRC_URI += "file://obmc-shutdown.sh"
+SRC_URI += "file://obmc-update.sh"
+SRC_URI += "file://whitelist"
+
+do_install() {
+ if ${OVERLAY_BASETYPE} != ext4 -o ${IMAGE_BASETYPE} != squashfs-xz
+ then
+ bbfatal only ext4 overlayed squashfs-xz is currently supported
+ fi
+
+ install -m 0755 ${WORKDIR}/obmc-init.sh ${D}/init
+ install -m 0755 ${WORKDIR}/obmc-shutdown.sh ${D}/shutdown
+ install -m 0755 ${WORKDIR}/obmc-update.sh ${D}/update
+ install -m 0644 ${WORKDIR}/whitelist ${D}/whitelist
+ install -d ${D}/dev
+ mknod -m 622 ${D}/dev/console c 5 1
+}
+
+FILES_${PN} += " /init /shutdown /update /whitelist /dev "
diff --git a/meta-phosphor/common/recipes-phosphor/skeleton/skeleton.bb b/meta-phosphor/common/recipes-phosphor/skeleton/skeleton.bb
index 0e596d7..ab753b1 100644
--- a/meta-phosphor/common/recipes-phosphor/skeleton/skeleton.bb
+++ b/meta-phosphor/common/recipes-phosphor/skeleton/skeleton.bb
@@ -16,7 +16,7 @@ DEPENDS += "glib-2.0"
RDEPENDS_${PN} += "python-subprocess python-tftpy"
SRC_URI += "git://github.com/openbmc/skeleton"
-SRCREV = "5968064479270edf233739d97dc6e37f04069d38"
+SRCREV = "51fb4a1840058a70387b39210cb4663577941c17"
S = "${WORKDIR}"
--
2.6.4
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