Re: [PATCH v2 05/12] ci: convert "install-dependencies.sh" to use "/bin/sh"

> We're about to merge the "install-docker-dependencies.sh" script into
> "install-dependencies.sh". This will also move our Alpine-based jobs
> over to use the latter script. This script uses the Bash shell though,
> which is not available by default on Alpine Linux.
> 
> Refactor "install-dependencies.sh" to use "/bin/sh" instead of Bash.
> This requires us to get rid of the pushd/popd invocations, which are
> replaced by some more elaborate commands that download or extract
> executables right to where they are needed.
> 
> Signed-off-by: Patrick Steinhardt <ps@pks.im>
> ---
>  ci/install-dependencies.sh | 28 +++++++++++-----------------
>  1 file changed, 11 insertions(+), 17 deletions(-)
> 
> diff --git a/ci/install-dependencies.sh b/ci/install-dependencies.sh
> index fad53aac96..7bcccc96fd 100755
> --- a/ci/install-dependencies.sh
> +++ b/ci/install-dependencies.sh
> @@ -1,4 +1,4 @@
> -#!/usr/bin/env bash
> +#!/bin/sh
>  #
>  # Install dependencies required to build and test Git on Linux and macOS
>  #
> @@ -30,19 +30,14 @@ ubuntu-*)
>  		$CC_PACKAGE $PYTHON_PACKAGE
>  
>  	mkdir --parents "$P4_PATH"
> -	pushd "$P4_PATH"
> -		wget --quiet "$P4WHENCE/bin.linux26x86_64/p4d"
> -		wget --quiet "$P4WHENCE/bin.linux26x86_64/p4"
> -		chmod u+x p4d
> -		chmod u+x p4
> -	popd
> +	wget --quiet --directory-prefix="$P4_PATH" \
> +		"$P4WHENCE/bin.linux26x86_64/p4d" "$P4WHENCE/bin.linux26x86_64/p4"
> +	chmod u+x "$P4_PATH/p4d" "$P4_PATH/p4"
>  
>  	mkdir --parents "$GIT_LFS_PATH"
> -	pushd "$GIT_LFS_PATH"
> -		wget --quiet "$LFSWHENCE/git-lfs-linux-amd64-$LINUX_GIT_LFS_VERSION.tar.gz"
> -		tar --extract --gunzip --file "git-lfs-linux-amd64-$LINUX_GIT_LFS_VERSION.tar.gz"
> -		cp git-lfs-$LINUX_GIT_LFS_VERSION/git-lfs .
> -	popd
> +	wget --quiet "$LFSWHENCE/git-lfs-linux-amd64-$LINUX_GIT_LFS_VERSION.tar.gz"
> +	tar -xzf "git-lfs-linux-amd64-$LINUX_GIT_LFS_VERSION.tar.gz" -C "$GIT_LFS_PATH" --strip-components=1 "git-lfs-$LINUX_GIT_LFS_VERSION/git-lfs"