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remote: Use tmp file buffer when restore ip dump
When CRIU calls the ip tool on restore, it passes the fd of remote socket by replacing the STDIN before execvp. The stdin is used by the ip tool to receive input. However, the ip tool calls ftell(stdin) which fails with "Illegal seek" since UNIX sockets do not support file positioning operations. To resolve this issue, read the received content from the UNIX socket and store it into temporary file, then replace STDIN with the fd of this tmp file. # python test/zdtm.py run -t zdtm/static/env00 --remote -f ns === Run 1/1 ================ zdtm/static/env00 ========================= Run zdtm/static/env00 in ns ========================== Start test ./env00 --pidfile=env00.pid --outfile=env00.out --envname=ENV_00_TEST Adding image cache Adding image proxy Run criu dump Run criu restore =[log]=> dump/zdtm/static/env00/31/1/restore.log ------------------------ grep Error ------------------------ RTNETLINK answers: File exists (00.229895) 1: do_open_remote_image RDONLY path=route-9.img snapshot_id=dump/zdtm/static/env00/31/1 (00.230316) 1: Running ip route restore Failed to restore: ftell: Illegal seek (00.232757) 1: Error (criu/util.c:712): exited, status=255 (00.232777) 1: Error (criu/net.c:1479): IP tool failed on route restore (00.232803) 1: Error (criu/net.c:2153): Can't create net_ns (00.255091) Error (criu/cr-restore.c:1177): 105 killed by signal 9: Killed (00.255307) Error (criu/mount.c:2960): mnt: Can't remove the directory /tmp/.criu.mntns.dTd7ak: No such file or directory (00.255339) Error (criu/cr-restore.c:2119): Restoring FAILED. ------------------------ ERROR OVER ------------------------ ################# Test zdtm/static/env00 FAIL at CRIU restore ################## ##################################### FAIL ##################################### Fixes checkpoint-restore#311 Signed-off-by: Radostin Stoyanov <rstoyanov1@gmail.com>
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