First of all, it ran `is_btrfs "$chrootdir"` to decide if it was on btrfs, but $chrootdir wasn't defined locally; it just happens to work because $chrootdir was defined in main(). (I noticed this because in Parabola, it is called differently, so $chrootdir was empty). So I was tempted to just change it to `is_btrfs "$copydir"`, but if $copydir is just a regular directory on a btrfs filesystem, then it It would leave much of $copydir intact. What we really care about is if $copydir is a btrfs subvolume; which we can check by combining the is_btrfs check with inspecting the inum of the directory. I put this combined check in lib/archroot.sh:is_subvolume. https://lists.archlinux.org/pipermail/arch-projects/2013-September/003901.ht... --- lib/archroot.sh | 11 ++++++++++- makechrootpkg.in | 2 +- 2 files changed, 11 insertions(+), 2 deletions(-) diff --git a/lib/archroot.sh b/lib/archroot.sh index 46d4963..87c28a2 100644 --- a/lib/archroot.sh +++ b/lib/archroot.sh @@ -25,6 +25,15 @@ is_btrfs() { } ## +# usage : is_subvolume( $path ) +# return : whether $path is a the root of a btrfs subvolume (including +# the top-level subvolume). +## +is_subvolume() { + [[ -e "$1" && "$(stat -f -c %T "$1")" == btrfs && "$(stat -c %i "$1")" == 256 ]] +} + +## # usage : subvolume_delete_recursive( $path ) # # Find all btrfs subvolumes under and including $path and delete them. @@ -32,7 +41,7 @@ is_btrfs() { subvolume_delete_recursive() { local subvol - is_btrfs "$1" || return 0 + is_subvolume "$1" || return 0 while IFS= read -d $'\0' -r subvol; do if ! btrfs subvolume delete "$subvol" &>/dev/null; then diff --git a/makechrootpkg.in b/makechrootpkg.in index 72b7eb7..88c2cdc 100644 --- a/makechrootpkg.in +++ b/makechrootpkg.in @@ -144,7 +144,7 @@ delete_chroot() { local copy=${1:-$2} stat_busy "Removing chroot copy [%s]" "$copy" - if is_btrfs "$chrootdir" && ! mountpoint -q "$copydir"; then + if is_subvolume "$copydir" && ! mountpoint -q "$copydir"; then subvolume_delete_recursive "$copydir" || die "Unable to delete subvolume %s" "$copydir" else -- 2.12.2