Support building on Alpine

[AkihiroSuda]

FROM alpine:3.7
RUN apk add --no-cache alpine-sdk linux-headers bsd-compat-headers libexecinfo-dev talloc-dev protobuf-c-dev 
RUN git clone https://github.com/rootless-containers/PRoot.git \
  && cd PRoot \
  && git checkout 081bb63955eb4378e53cf4d0eb0ed0d3222bf66e \
  && cd src \
  && make && mv proot / && make clean

Failing:

make: [GNUmakefile:135: .check_process_vm] Error 1 (ignored)
make: [GNUmakefile:135: .check_seccomp_filter] Error 1 (ignored)
  GEN   build.h
  CC    cli/cli.o
In file included from ./cli/cli.h:7:0,
                 from ./cli/cli.c:36:
./tracee/tracee.h:150:24: error: field 'restart_how' has incomplete type
  enum __ptrace_request restart_how;
                        ^~~~~~~~~~~
make: *** [GNUmakefile:179: cli/cli.o] Error 1

[oxr463]

Greetings, I am working on packaging proot for alpine (lramage94/aports/testing/proot on GitLab), perhaps we can collaborate on this.

[oxr463]

enum __ptrace_request on musl seems to be a pretty common issue. Let me see what I can find out.

Update:

#include <sys/wait.h>. Without it, __WALL macro for waitpid() is missing and compile errors pop out.

musl uses int instead. I had to add #define __ptrace_request int just after all includes but before // doesn't always seem to be defined in the headers defines.

Taken from: eteran/edb-debugger#635

ifndef __GLIBC__

Adapted from: festvox/speech_tools#3

/* "enum __ptrace_request request" is used by glibc, but musl uses "int". */

Taken from: DynamoRIO/dynamorio@88e580e

objcopy --input-target --output-target

/usr/lib/gcc/x86_64-alpine-linux-musl/8.2.0/../../../../x86_64-alpine-linux-musl/bin/ld: cli/cli.o: in function `__cyg_profile_func_enter':
cli.c:(.text+0x908): undefined reference to `backtrace_symbols'

See: tkelman/julia-alpine#1

/usr/lib/gcc/x86_64-alpine-linux-musl/8.2.0/../../../../x86_64-alpine-linux-musl/bin/ld: tracee/tracee.o: in function `new_child':
tracee.c:(.text+0xabb): undefined reference to `__W_STOPCODE'

See: https://patchwork.openembedded.org/patch/108099/

[AkihiroSuda]

Thanks!

[oxr463]

Merged: proot-me#141