script: Enable SC2155 rule for Gitian scripts

Also pwd command is replaced with $PWD variable everywhere for
consistency.

contrib/gitian-descriptors/gitian-linux.yml

@@ -51,7 +51,7 @@ script: |
   export QT_RCC_TEST=1
   export QT_RCC_SOURCE_DATE_OVERRIDE=1
   export TZ="UTC"
-  export BUILD_DIR=$(pwd)
+  export BUILD_DIR="$PWD"
   mkdir -p ${WRAP_DIR}
   if test -n "$GBUILD_CACHE_ENABLED"; then
     export SOURCES_PATH=${GBUILD_COMMON_CACHE}
@@ -122,7 +122,7 @@ script: |
   done
 
   cd bitcoin
-  BASEPREFIX=$(pwd)/depends
+  BASEPREFIX="${PWD}/depends"
   # Build dependencies for each host
   for i in $HOSTS; do
     EXTRA_INCLUDES="$EXTRA_INCLUDES_BASE/$i"
@@ -161,7 +161,7 @@ script: |
     export PATH=${BASEPREFIX}/${i}/native/bin:${ORIGPATH}
     mkdir -p distsrc-${i}
     cd distsrc-${i}
-    INSTALLPATH=$(pwd)/installed/${DISTNAME}
+    INSTALLPATH="${PWD}/installed/${DISTNAME}"
     mkdir -p ${INSTALLPATH}
     tar --strip-components=1 -xf ../$SOURCEDIST
 

contrib/gitian-descriptors/gitian-osx-signer.yml

@@ -17,7 +17,7 @@ script: |
 
   WRAP_DIR=$HOME/wrapped
   mkdir -p ${WRAP_DIR}
-  export PATH=$(pwd):$PATH
+  export PATH="$PWD":$PATH
   FAKETIME_PROGS="dmg genisoimage"
 
   # Create global faketime wrappers

contrib/gitian-descriptors/gitian-osx.yml

@@ -45,7 +45,7 @@ script: |
   export QT_RCC_TEST=1
   export QT_RCC_SOURCE_DATE_OVERRIDE=1
   export TZ="UTC"
-  export BUILD_DIR=$(pwd)
+  export BUILD_DIR="$PWD"
   mkdir -p ${WRAP_DIR}
   if test -n "$GBUILD_CACHE_ENABLED"; then
     export SOURCES_PATH=${GBUILD_COMMON_CACHE}
@@ -86,7 +86,7 @@ script: |
   export PATH=${WRAP_DIR}:${PATH}
 
   cd bitcoin
-  BASEPREFIX=$(pwd)/depends
+  BASEPREFIX="${PWD}/depends"
 
   mkdir -p ${BASEPREFIX}/SDKs
   tar -C ${BASEPREFIX}/SDKs -xf ${BUILD_DIR}/MacOSX10.11.sdk.tar.gz
@@ -125,7 +125,7 @@ script: |
     export PATH=${BASEPREFIX}/${i}/native/bin:${ORIGPATH}
     mkdir -p distsrc-${i}
     cd distsrc-${i}
-    INSTALLPATH=$(pwd)/installed/${DISTNAME}
+    INSTALLPATH="${PWD}/installed/${DISTNAME}"
     mkdir -p ${INSTALLPATH}
     tar --strip-components=1 -xf ../$SOURCEDIST
 

contrib/gitian-descriptors/gitian-win-signer.yml

@@ -19,7 +19,7 @@ files:
 script: |
   set -e -o pipefail
 
-  BUILD_DIR=$(pwd)
+  BUILD_DIR="$PWD"
   SIGDIR=${BUILD_DIR}/signature/win
   UNSIGNED_DIR=${BUILD_DIR}/unsigned
 

contrib/gitian-descriptors/gitian-win.yml

@@ -40,7 +40,7 @@ script: |
   export QT_RCC_TEST=1
   export QT_RCC_SOURCE_DATE_OVERRIDE=1
   export TZ="UTC"
-  export BUILD_DIR=$(pwd)
+  export BUILD_DIR="$PWD"
   mkdir -p ${WRAP_DIR}
   if test -n "$GBUILD_CACHE_ENABLED"; then
     export SOURCES_PATH=${GBUILD_COMMON_CACHE}
@@ -96,7 +96,7 @@ script: |
   export PATH=${WRAP_DIR}:${PATH}
 
   cd bitcoin
-  BASEPREFIX=$(pwd)/depends
+  BASEPREFIX="${PWD}/depends"
   # Build dependencies for each host
   for i in $HOSTS; do
     make ${MAKEOPTS} -C ${BASEPREFIX} HOST="${i}"
@@ -131,7 +131,7 @@ script: |
     export PATH=${BASEPREFIX}/${i}/native/bin:${ORIGPATH}
     mkdir -p distsrc-${i}
     cd distsrc-${i}
-    INSTALLPATH=$(pwd)/installed/${DISTNAME}
+    INSTALLPATH="${PWD}/installed/${DISTNAME}"
     mkdir -p ${INSTALLPATH}
     tar --strip-components=1 -xf ../$SOURCEDIST
 

test/lint/lint-shell.sh

@@ -26,7 +26,6 @@ disabled_gitian=(
     SC2001 # See if you can use ${variable//search/replace} instead.
     SC2094 # Make sure not to read and write the same file in the same pipeline.
     SC2129 # Consider using { cmd1; cmd2; } >> file instead of individual redirects.
-    SC2155 # Declare and assign separately to avoid masking return values.
     SC2230 # which is non-standard. Use builtin 'command -v' instead.
 )