Merge chroot script into single dynamic one

root/usr/local/bin/arch-chroot

@@ -1,39 +0,0 @@
-#!/bin/sh
-
-# Ensure we run as root
-if [ "$EUID" -ne 0 ]; then
-    echo "Must be ran as root"
-    exit 1
-fi
-
-# Take chroot user as 1st argument, default to root
-if [ $# -ge 1 ]; then
-    USERNAME="$1"
-else
-    USERNAME="root"
-fi
-
-MOUNT_POINT="/mnt/arch"
-
-# Make sure the partition is mounted according to fstab
-mount "$MOUNT_POINT" 2> /dev/null
-
-# Mount necessary directories for chroot to be possible
-mount --types proc /proc "$MOUNT_POINT/proc"
-mount --rbind /sys "$MOUNT_POINT/sys"
-mount --make-rslave "$MOUNT_POINT/sys"
-mount --rbind /dev "$MOUNT_POINT/dev"
-mount --make-rslave "$MOUNT_POINT/dev"
-
-# Use /bin/su for chrooting with --login to also run
-# /etc/profile and ~/.profile or ~/.zprofile
-chroot "$MOUNT_POINT" "/bin/su" "$USERNAME" --login
-
-# Unmount recursively mounted directories
-umount -l "$MOUNT_POINT/dev"
-umount -l "$MOUNT_POINT/sys"
-umount -l "$MOUNT_POINT/proc"
-umount -R "$MOUNT_POINT"
-
-# Remount partition according to fstab
-mount "$MOUNT_POINT"

root/usr/local/bin/auto-chroot

@@ -0,0 +1,81 @@
+#!/bin/sh
+
+yes_no() {
+    while true; do
+        printf "$1 (y/n): "
+        read -r yn
+        case $yn in
+            [Yy]* ) return 0;;
+            [Nn]* ) return 1;;
+            * ) echo "Please answer yes or no";;
+        esac
+    done
+}
+
+# Ensure we run as root
+if [ "$EUID" -ne 0 ]; then
+    echo "Must be ran as root"
+    exit 1
+fi
+
+# Take NEWROOT as 1st argument
+if [ $# -ge 1 ]; then
+    NEWROOT="$1"
+else
+    echo "Provide newroot directory"
+    exit 1
+fi
+
+# Take chroot user as 2nd argument, default to root
+if [ $# -ge 2 ]; then
+    USERNAME="$2"
+else
+    USERNAME="root"
+fi
+
+# Check if given NEWROOT is already mounted, if it is
+# set REMOUNT to the mount source, so that we can remount
+# it once we're done.
+df_out=$(df --output=source,target | grep -w "$NEWROOT")
+if [ -n "$df_out" ]; then
+    REMOUNT="$(echo $df_out | awk '{print $1}')"
+else
+    # If the target isn't mounted already, check
+    # if user gave $3 (mount location)
+    if [ $# -ge 3 ]; then
+        mount "$3" "$NEWROOT"
+    else
+        # If user didn't give mount location, try to
+        # mount according to fstab
+        if [ -n "$(grep -w "$NEWROOT" /etc/fstab)" ]; then
+            mount "$NEWROOT"
+        else
+            # Ask for user confirmation to ensure that filesystem
+            # is ready for chroot in given NEWROOT, exit if not
+            yes_no "$NEWROOT wasn't mounted, is your filesystem in place?" || exit 1
+        fi
+    fi
+fi
+
+# Mount necessary directories for chroot to be possible
+mount --types proc /proc "$NEWROOT/proc"
+mount --rbind /sys "$NEWROOT/sys"
+mount --make-rslave "$NEWROOT/sys"
+mount --rbind /dev "$NEWROOT/dev"
+mount --make-rslave "$NEWROOT/dev"
+
+# Use /bin/su for chrooting with --login to also run
+# /etc/profile and ~/.profile or ~/.zprofile
+chroot "$NEWROOT" "/bin/su" "$USERNAME" --login
+
+# Unmount recursively mounted directories
+umount -l "$NEWROOT/dev"
+umount -l "$NEWROOT/sys"
+umount -l "$NEWROOT/proc"
+umount -R "$NEWROOT"
+
+# Remount partition according to fstab if REMOUT is set
+# in order to leave the filesystem in the state it was
+if [ -n "$REMOUNT" ]; then
+    mount "$REMOUNT" "$NEWROOT"
+fi

root/usr/local/bin/gentoo-chroot

@@ -1,39 +0,0 @@
-#!/bin/sh
-
-# Ensure we run as root
-if [ "$EUID" -ne 0 ]; then
-    echo "Must be ran as root"
-    exit 1
-fi
-
-# Take chroot user as 1st argument, default to root
-if [ $# -ge 1 ]; then
-    USERNAME="$1"
-else
-    USERNAME="root"
-fi
-
-MOUNT_POINT="/mnt/gentoo"
-
-# Make sure the partition is mounted according to fstab
-mount "$MOUNT_POINT" 2> /dev/null
-
-# Mount necessary directories for chroot to be possible
-mount --types proc /proc "$MOUNT_POINT/proc"
-mount --rbind /sys "$MOUNT_POINT/sys"
-mount --make-rslave "$MOUNT_POINT/sys"
-mount --rbind /dev "$MOUNT_POINT/dev"
-mount --make-rslave "$MOUNT_POINT/dev"
-
-# Use /bin/su for chrooting with --login to also run
-# /etc/profile and ~/.profile or ~/.zprofile
-chroot "$MOUNT_POINT" "/bin/su" "$USERNAME" --login
-
-# Unmount recursively mounted directories
-umount -l "$MOUNT_POINT/dev"
-umount -l "$MOUNT_POINT/sys"
-umount -l "$MOUNT_POINT/proc"
-umount -R "$MOUNT_POINT"
-
-# Remount partition according to fstab
-mount "$MOUNT_POINT"