skip () { if [ -n "$NIX_DEBUG" ]; then echo "skipping impure path $1" >&2 fi } # Checks whether a path is impure. E.g., `/lib/foo.so' is impure, but # `/nix/store/.../lib/foo.so' isn't. badPath() { local p=$1 # Relative paths are okay (since they're presumably relative to # the temporary build directory). if [ "${p:0:1}" != / ]; then return 1; fi # Otherwise, the path should refer to the store or some temporary # directory (including the build directory). test \ "$p" != "/dev/null" -a \ "${p:0:${#NIX_STORE}}" != "$NIX_STORE" -a \ "${p:0:4}" != "/tmp" -a \ "${p:0:${#NIX_BUILD_TOP}}" != "$NIX_BUILD_TOP" }