script: Enable SC2006 rule for Gitian scripts

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}
@@ -107,7 +107,7 @@ script: |
   rm -f ${WRAP_DIR}/${prog}
   cat << EOF > ${WRAP_DIR}/${prog}
   #!/usr/bin/env bash
-  REAL="`which -a ${prog}-8 | grep -v ${WRAP_DIR}/${prog} | head -1`"
+  REAL="$(which -a ${prog}-8 | grep -v ${WRAP_DIR}/${prog} | head -1)"
   for var in "\$@"
   do
     if [ "\$var" = "-m32" ]; then
@@ -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"
@@ -141,10 +141,10 @@ script: |
 
   # Create the release tarball using (arbitrarily) the first host
   ./autogen.sh
-  CONFIG_SITE=${BASEPREFIX}/`echo "${HOSTS}" | awk '{print $1;}'`/share/config.site ./configure --prefix=/
+  CONFIG_SITE=${BASEPREFIX}/$(echo "${HOSTS}" | awk '{print $1;}')/share/config.site ./configure --prefix=/
   make dist
-  SOURCEDIST=`echo bitcoin-*.tar.gz`
-  DISTNAME=`echo ${SOURCEDIST} | sed 's/.tar.*//'`
+  SOURCEDIST=$(echo bitcoin-*.tar.gz)
+  DISTNAME=$(echo ${SOURCEDIST} | sed 's/.tar.*//')
   # Correct tar file order
   mkdir -p temp
   pushd temp
@@ -161,7 +161,7 @@ script: |
     export PATH=${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
@@ -104,10 +104,10 @@ script: |
 
   # Create the release tarball using (arbitrarily) the first host
   ./autogen.sh
-  CONFIG_SITE=${BASEPREFIX}/`echo "${HOSTS}" | awk '{print $1;}'`/share/config.site ./configure --prefix=/
+  CONFIG_SITE=${BASEPREFIX}/$(echo "${HOSTS}" | awk '{print $1;}')/share/config.site ./configure --prefix=/
   make dist
-  SOURCEDIST=`echo bitcoin-*.tar.gz`
-  DISTNAME=`echo ${SOURCEDIST} | sed 's/.tar.*//'`
+  SOURCEDIST=$(echo bitcoin-*.tar.gz)
+  DISTNAME=$(echo ${SOURCEDIST} | sed 's/.tar.*//')
 
   # Correct tar file order
   mkdir -p temp
@@ -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
 
@@ -36,7 +36,7 @@ script: |
   ./configure --without-gsf --without-curl --disable-dependency-tracking
   make
   find ${UNSIGNED_DIR} -name "*-unsigned.exe" | while read i; do
-    INFILE="`basename "${i}"`"
-    OUTFILE="`echo "${INFILE}" | sed s/-unsigned//`"
+    INFILE="$(basename "${i}")"
+    OUTFILE="$(echo "${INFILE}" | sed s/-unsigned//)"
     ./osslsigncode attach-signature -in "${i}" -out "${OUTDIR}/${OUTFILE}" -sigin "${SIGDIR}/${INFILE}.pem"
   done

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}"
@@ -111,10 +111,10 @@ script: |
 
   # Create the release tarball using (arbitrarily) the first host
   ./autogen.sh
-  CONFIG_SITE=${BASEPREFIX}/`echo "${HOSTS}" | awk '{print $1;}'`/share/config.site ./configure --prefix=/
+  CONFIG_SITE=${BASEPREFIX}/$(echo "${HOSTS}" | awk '{print $1;}')/share/config.site ./configure --prefix=/
   make dist
-  SOURCEDIST=`echo bitcoin-*.tar.gz`
-  DISTNAME=`echo ${SOURCEDIST} | sed 's/.tar.*//'`
+  SOURCEDIST=$(echo bitcoin-*.tar.gz)
+  DISTNAME=$(echo ${SOURCEDIST} | sed 's/.tar.*//')
   # Correct tar file order
   mkdir -p temp
   pushd temp
@@ -131,7 +131,7 @@ script: |
     export PATH=${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

@@ -24,7 +24,6 @@ disabled=(
 )
 disabled_gitian=(
     SC2001 # See if you can use ${variable//search/replace} instead.
-    SC2006 # Use $(...) notation instead of legacy backticked `...`.
     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.