pretty-print permission errors while caching
pretty-print permission errors while caching

fixes #3390

ipmobiletech/bundler,joshsoftware/bundler,zhangkuaiji/bundler,AiyionPrime/bundler,kohgpat/bundler,dilumnavanjana/bundler,byroot/bundler,suhastech/bundler,ximus/bundler,simplybusiness/bundler,byroot/bundler,jaym/bundler,davydovanton/bundler,EasonYi/bundler,chulkilee/bundler,schaary/bundler,anil826/bundler,RochesterinNYC/bundler,lmtim/bundler,frsyuki/bundler,cdwort/bundler,agis-/bundler,danimashu/bundler,kohgpat/bundler,CorainChicago/bundler,PG-kura/bundler,masarakki/bundler,tgxworld/bundler,h4ck3rm1k3/bundler,Elffers/bundler,mvz/bundler,mpapis/bundler,asymmetric/bundler,pjump/bundler,frsyuki/bundler,tgxworld/bundler,chulkilee/bundler,TimMoore/bundler,mvz/bundler,asutoshpalai/bundler,schaary/bundler,asymmetric/bundler,agis-/bundler,TimMoore/bundler,Elffers/bundler,jaym/bundler,mpapis/bundler,Teino1978-Corp/Teino1978-Corp-bundler,elovelan/bundler,bundler/bundler,dilumnavanjana/bundler,mdorrance/bundler,philnash/bundler,mattbrictson/bundler-1,gregkare/bundler,patvice/bundler,wenderjean/bundler,Teino1978-Corp/Teino1978-Corp-bundler,patvice/bundler,cdwort/bundler,smlance/bundler,danimashu/bundler,roseweixel/bundler,simplybusiness/bundler,wenderjean/bundler,Eric-Guo/bundler,EthanK28/bundler,suhastech/bundler,bundler/bundler,pivotal-cf-experimental/bundler,PG-kura/bundler,joshsoftware/bundler,ngpestelos/bundler,steved/bundler,Wirachmat/bundler,EasonYi/bundler,pjump/bundler,seanlinsley/bundler,ipmobiletech/bundler,zhangkuaiji/bundler,elovelan/bundler,chef/bundler,neslom/bundler,ngpestelos/bundler,AiyionPrime/bundler,jingweno/bundler,anil826/bundler,bronzdoc/bundler,cstrahan/bundler,carpodaster/bundler,neslom/bundler,h4ck3rm1k3/bundler,carpodaster/bundler,davydovanton/bundler,mattbrictson/bundler-1,RochesterinNYC/bundler,smlance/bundler,bronzdoc/bundler,nju520/bundler,robinboening/bundler,chef/bundler,pivotal-cf-experimental/bundler,Wirachmat/bundler,christer155/bundler,CorainChicago/bundler,gregkare/bundler,lmtim/bundler,ligi/bundler,seanlinsley/bundler,philnash/bundler,steved/bundler,jingweno/bundler,robinboening/bundler,ximus/bundler,jasonkarns/bundler,jasonkarns/bundler,masarakki/bundler,christer155/bundler,mdorrance/bundler,nju520/bundler,Eric-Guo/bundler,roseweixel/bundler,cstrahan/bundler,ligi/bundler,asutoshpalai/bundler,EthanK28/bundler