1 files changed, 68 insertions, 0 deletions
diff --git a/contrib/cpt-chroot b/contrib/cpt-chroot
new file mode 100755
index 0000000..7d0585c
--- /dev/null
+++ b/contrib/cpt-chroot
@@ -0,0 +1,68 @@
+#!/bin/sh -e
+# Enter a chroot
+
+log() {
+    printf '\033[32m->\033[m %s.\n' "$*"
+}
+
+usage() { printf '\033[1;33m-> \033[m%s\n' "usage: ${0##*/} [dir]" ; exit 0 ;}
+
+die() {
+    log "$*" >&2
+    exit 1
+}
+
+clean() {
+    log Unmounting /dev, /proc and /sys from chroot; {
+        umount "$1/dev"  ||:
+        umount "$1/proc" ||:
+        umount "$1/sys"  ||:
+    }
+
+    log Cleaning leftover host files; {
+        rm -f "$1/root/.ash_history"
+    }
+}
+
+main() {
+    case "$1" in ''|--help|-h) usage; esac
+    [ -d "$1" ]        || die Given path does not exist
+    [ "$(id -u)" = 0 ] || die Script needs to be run as root
+
+    [ "$2" ] || {
+        march=$(uname -m 2>/dev/null) ||:
+        case "$march" in
+            '')     march=native ;;
+            x86_64) march=x86-64 ;;
+            i*86)   march=i686 ;;
+        esac
+    }
+
+    trap 'clean "$1"' EXIT INT
+
+    log Mounting /dev, /proc and /sys from host; {
+        mountpoint -q "$1/dev"  || mount -o bind /dev "$1/dev"
+        mountpoint -q "$1/proc" || mount -t proc proc "$1/proc"
+        mountpoint -q "$1/sys"  || mount -t sysfs sys "$1/sys"
+
+    }
+
+    log Copying /etc/resolv.conf from host; {
+         [ -f "$1/etc/resolv.conf" ] || cp /etc/resolv.conf "$1/etc"
+    }
+
+    log Entering chroot; {
+        chroot "$1" /usr/bin/env -i \
+            HOME=/root \
+            TERM="$TERM" \
+            SHELL=/bin/sh \
+            USER=root \
+            KISS_ASROOT=1 \
+            CFLAGS="${CFLAGS:--march=$march -mtune=generic -pipe -Os}" \
+            CXXFLAGS="${CXXFLAGS:--march=$march -mtune=generic -pipe -Os}" \
+            MAKEFLAGS="${MAKFLAGS:--j$(nproc 2>/dev/null || echo 1)}" \
+            /bin/sh -l
+    }
+}
+
+main "$@"