Fix linux Docker builds

ClientLibrary/README.md

@@ -57,10 +57,13 @@ Note that you may need to use `sudo docker` below, depending on your OS.
 
 *Ensure that the command below is run from within the `ClientLibrary` directory*
 
+*The `--user "$(id -u):$(id -g)"` flag must be omitted when building on macOS because manually specifying the UID/GID will cause the build to fail since Docker on macOS handles host to container UID/GID mapping automatically and will be unable to map the manually specified UID/GID to the current user.*
+
 ```bash
 cd .. && \
   docker run \
   --platform=linux/amd64 \
+  --user "$(id -u):$(id -g)" \
   --rm \
   -v $PWD:/go/src/github.com/Psiphon-Labs/psiphon-tunnel-core \
   psiclientlibrary-builder \

ClientLibrary/make.bash

@@ -10,6 +10,8 @@ fi
 # $2, if specified, is go build tags
 if [ -z ${2+x} ]; then BUILD_TAGS=""; else BUILD_TAGS="$2"; fi
 
+export GOCACHE=/tmp
+
 BUILD_DIR=build
 
 if [ ! -d ${BUILD_DIR} ]; then

ConsoleClient/README.md

@@ -14,10 +14,13 @@ Note that you may need to use `sudo docker` below, depending on your OS.
 
 *Ensure that the command below is run from within the `ConsoleClient` directory*
 
+*The `--user "$(id -u):$(id -g)"` flag must be omitted when building on macOS because manually specifying the UID/GID will cause the build to fail since Docker on macOS handles host to container UID/GID mapping automatically and will be unable to map the manually specified UID/GID to the current user.*
+
 ```bash
 cd .. && \
   docker run \
   --platform=linux/amd64 \
+  --user "$(id -u):$(id -g)" \
   --rm \
   -v $PWD:/go/src/github.com/Psiphon-Labs/psiphon-tunnel-core \
   psiclient \

ConsoleClient/make.bash

@@ -10,6 +10,8 @@ fi
 # $2, if specified, is go build tags
 if [ -z ${2+x} ]; then BUILD_TAGS=""; else BUILD_TAGS="$2"; fi
 
+export GOCACHE=/tmp
+
 EXE_BASENAME="psiphon-tunnel-core"
 
 prepare_build () {

MobileLibrary/Android/README.md

@@ -48,10 +48,13 @@ Note that you may need to use `sudo docker` below, depending on your OS.
 
 *Ensure that the command below is run from within the `MobileLibrary/Android` directory*
 
+*The `--user "$(id -u):$(id -g)"` flag must be omitted when building on macOS because manually specifying the UID/GID will cause the build to fail since Docker on macOS handles host to container UID/GID mapping automatically and will be unable to map the manually specified UID/GID to the current user.*
+
 ```bash
 cd ../.. && \
   docker run \
   --platform=linux/amd64 \
+  --user "$(id -u):$(id -g)" \
   --rm \
   -v $(pwd):/go/src/github.com/Psiphon-Labs/psiphon-tunnel-core \
   psiandroid \

MobileLibrary/Android/make.bash

@@ -13,6 +13,8 @@ if [ -z ${1+x} ]; then BUILD_TAGS=""; else BUILD_TAGS="$1"; fi
 # At this time, psiphon-tunnel-core doesn't support modules
 export GO111MODULE=off
 
+export GOCACHE=/tmp
+
 BUILDINFOFILE="psiphon-tunnel-core_buildinfo.txt"
 BUILDDATE=$(date --iso-8601=seconds)
 BUILDREPO=$(git config --get remote.origin.url)

Server/make.bash

@@ -13,6 +13,8 @@ fi
 # $1, if specified, is go build tags
 if [ -z ${1+x} ]; then BUILD_TAGS=""; else BUILD_TAGS="$1"; fi
 
+export GOCACHE=/tmp
+
 prepare_build () {
   BUILDINFOFILE="psiphond_buildinfo.txt"
   BUILDDATE=$(date -Iseconds)