From 5a5e712c749edb8bca448f119769d8bbe381c348 Mon Sep 17 00:00:00 2001 From: Dave Reisner Date: Sun, 25 Nov 2012 16:00:58 -0500 Subject: pkgdelta: avoid use of eval and IFS manipulation Instead of blindly consuming data from the .PKGINFO file, parse it more closely and only declare variables as needed. Should help to avoid nonsensical errors and possibly dangerous command execution as seen in FS#32852. Signed-off-by: Dave Reisner Signed-off-by: Allan McRae --- scripts/pkgdelta.sh.in | 28 ++++++++++++---------------- 1 file changed, 12 insertions(+), 16 deletions(-) diff --git a/scripts/pkgdelta.sh.in b/scripts/pkgdelta.sh.in index 08835ac8..f9b40c96 100644 --- a/scripts/pkgdelta.sh.in +++ b/scripts/pkgdelta.sh.in @@ -72,23 +72,19 @@ isnumeric() { [[ $1 != *[!0-9]* ]] } -read_pkginfo() -{ - pkgname= pkgver= arch= - local OLDIFS=$IFS - # IFS (field separator) is only the newline character - IFS=" -" - local line var val - for line in $(bsdtar -xOqf "$1" .PKGINFO 2>/dev/null | - grep -v "^#" | sed 's|\(\w*\)\s*=\s*\(.*\)|\1="\2"|'); do - eval "$line" - if [[ -n $pkgname && -n $pkgver && -n $arch ]]; then - IFS=$OLDIFS - return 0 - fi +read_pkginfo() { + while IFS='=' read -r field value; do + # skip comments and invalid lines + [[ $field = '#'* || -z $value ]] && continue + + # skip lines which aren't fields we care about + [[ $field != @(pkgver|pkgname|arch) ]] || continue + + declare "$field=$value" + + [[ $pkgname && $pkgver && $arch ]] && return 0 done - IFS=$OLDIFS + error "$(gettext "Invalid package file '%s'.")" "$1" return 1 } -- cgit v1.2.3-70-g09d2