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erc: add DwarFS AppImage extraction support (eterbug #19242) #9

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erc: add DwarFS AppImage extraction support (eterbug #19242) #9

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12 changes: 11 additions & 1 deletion bin/erc
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Original file line number Diff line number Diff line change
Expand Up @@ -155,10 +155,20 @@ extract_appimage()
{
local arc="$1"
local subdir="$2"
local offset

offset=$(LC_ALL=C grep -aboP 'DWARFS(?=[\x00-\x1f]{2})' "$arc" 2>/dev/null \
| head -1 | cut -d: -f1)
if [ -n "$offset" ] ; then
is_command dwarfsextract \
|| fatal "dwarfsextract is required to extract DwarFS AppImage files"
mkdir -p "$subdir" || fatal "Could not create extraction directory $subdir"
docmd dwarfsextract -i "$arc" -o "$subdir" -O "$offset"
return
fi

# Try unsquashfs with offset
if is_command unsquashfs ; then
local offset
chmod +x "$arc" 2>/dev/null
offset="$("$arc" --appimage-offset 2>/dev/null)"
# Fallback: find squashfs magic (for cross-arch AppImages)
Expand Down