Source: linux Version: 4.6.3-1 Severity: wishlist User: reproducible-builds@lists.alioth.debian.org Usertags: environment randomness X-Debbugs-Cc: reproducible-builds@lists.alioth.debian.org Hi! While working on the "reproducible builds" effort [1], we have noticed that linux could not be built reproducibly. Since we started varying the shell used for /bin/sh (bash vs. dash), linux no longer builds reproducibly. The following differences are in linux-headers packages: ── ./usr/src/linux-headers-4.6.0-1-686/arch/x86/include/generated/asm/.syscalls_32.h.cmd @@ -1 +1 @@ -cmd_arch/x86/entry/syscalls/../../include/generated/asm/syscalls_32.h := /bin/bash '/build/linux-4.6.3/arch/x86/entry/syscalls/syscalltbl.sh' /build/linux-4.6.3/arch/x86/entry/syscalls/syscall_32.tbl arch/x86/entry/syscalls/../../include/generated/asm/syscalls_32.h +cmd_arch/x86/entry/syscalls/../../include/generated/asm/syscalls_32.h := /bin/sh '/build/linux-4.6.3/arch/x86/entry/syscalls/syscalltbl.sh' /build/linux-4.6.3/arch/x86/entry/syscalls/syscall_32.tbl arch/x86/entry/syscalls/../../include/generated/asm/syscalls_32.h ── ./usr/src/linux-headers-4.6.0-1-686/arch/x86/include/generated/uapi/asm/.unistd_32.h.cmd @@ -1 +1 @@ -cmd_arch/x86/entry/syscalls/../../include/generated/uapi/asm/unistd_32.h := /bin/bash '/build/linux-4.6.3/arch/x86/entry/syscalls/syscallhdr.sh' '/build/linux-4.6.3/arch/x86/entry/syscalls/syscall_32.tbl' 'arch/x86/entry/syscalls/../../include/generated/uapi/asm/unistd_32.h' 'i386' '' '' +cmd_arch/x86/entry/syscalls/../../include/generated/uapi/asm/unistd_32.h := /bin/sh '/build/linux-4.6.3/arch/x86/entry/syscalls/syscallhdr.sh' '/build/linux-4.6.3/arch/x86/entry/syscalls/syscall_32.tbl' 'arch/x86/entry/syscalls/../../include/generated/uapi/asm/unistd_32.h' 'i386' '' '' ── ./usr/src/linux-headers-4.6.0-1-686/arch/x86/include/generated/uapi/asm/.unistd_64.h.cmd @@ -1 +1 @@ -cmd_arch/x86/entry/syscalls/../../include/generated/uapi/asm/unistd_64.h := /bin/bash '/build/linux-4.6.3/arch/x86/entry/syscalls/syscallhdr.sh' '/build/linux-4.6.3/arch/x86/entry/syscalls/syscall_64.tbl' 'arch/x86/entry/syscalls/../../include/generated/uapi/asm/unistd_64.h' 'common,64' '' '' +cmd_arch/x86/entry/syscalls/../../include/generated/uapi/asm/unistd_64.h := /bin/sh '/build/linux-4.6.3/arch/x86/entry/syscalls/syscallhdr.sh' '/build/linux-4.6.3/arch/x86/entry/syscalls/syscall_64.tbl' 'arch/x86/entry/syscalls/../../include/generated/uapi/asm/unistd_64.h' 'common,64' '' '' ── ./usr/src/linux-headers-4.6.0-1-686/arch/x86/include/generated/uapi/asm/.unistd_x32.h.cmd @@ -1 +1 @@ -cmd_arch/x86/entry/syscalls/../../include/generated/uapi/asm/unistd_x32.h := /bin/bash '/build/linux-4.6.3/arch/x86/entry/syscalls/syscallhdr.sh' '/build/linux-4.6.3/arch/x86/entry/syscalls/syscall_64.tbl' 'arch/x86/entry/syscalls/../../include/generated/uapi/asm/unistd_x32.h' 'common,x32' '' '__X32_SYSCALL_BIT' +cmd_arch/x86/entry/syscalls/../../include/generated/uapi/asm/unistd_x32.h := /bin/sh '/build/linux-4.6.3/arch/x86/entry/syscalls/syscallhdr.sh' '/build/linux-4.6.3/arch/x86/entry/syscalls/syscall_64.tbl' 'arch/x86/entry/syscalls/../../include/generated/uapi/asm/unistd_x32.h' 'common,x32' '' '__X32_SYSCALL_BIT' Are those .cmd files actually needed in the packages? They are caused by the SYSTBL and SYSHDR commands if I undertand it correctly. If they should be kept in the package, this can probably be solved by setting CONFIG_SHELL to a static value (/bin/bash). And the linux-source package has differences (randomly orderes elements) in the file usr/src/linux-source-4.6/tools/usb/usbip/autom4te.cache/requests (which I think doesn't need to be included either). Regards, Reiner [1]: https://wiki.debian.org/ReproducibleBuilds
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