1 files changed, 39 insertions, 0 deletions

diff --git a/src/extract-part1-files.bash b/src/extract-part1-files.bash
new file mode 100755
index 0000000..9b8ff1b
--- /dev/null
+++ b/src/extract-part1-files.bash
@@ -0,0 +1,39 @@
+#!/bin/bash
+set -e
+set -o pipefail
+
+image=$1
+[ -e "$image" ]
+shift
+base_dir=$1
+[ "$base_dir" ]
+shift
+source_files=("$@")
+
+get_fsdev()
+{
+    read < <(kpartx -rav "$image")
+    set -- $REPLY
+    if [[ $* == 'add map '*' '* ]]
+    then
+        fsdev=/dev/mapper/$3
+    else
+        echo "Error: kpartx: $REPLY" >&2
+        exit 1
+    fi
+}
+
+cleanup()
+{
+    umount -v /mnt
+    dev=$(losetup -j "$image" -nO NAME)
+    [ "$dev" ] || exit 0
+    kpartx -d "$dev" || true
+    losetup -d "$dev" || true
+}
+
+get_fsdev
+mount -v -r "$fsdev" /mnt
+trap cleanup EXIT
+source_dir=/mnt/$base_dir
+cp -v --no-preserve=mode -t . -- "${source_files[@]/#/$source_dir/}"