python - install python version to custom prefix or altinstall

seqs/python.cfg.example

@@ -0,0 +1,5 @@
+#!/usr/bin/env bash
+
+readonly sc_pyVersion=3.10
+# If empty, configure (for altinstall) uses default value (/usr/local)
+readonly sc_pyPrefix= #todo

seqs/python.sh

@@ -0,0 +1,123 @@
+#!/usr/bin/env bash
+
+readonly toolName=python
+readonly buildDeps=(build-essential zlib1g-dev libncurses5-dev libgdbm-dev libnss3-dev libssl-dev libreadline-dev libffi-dev libsqlite3-dev wget libbz2-dev)
+readonly buildHome="/tmp/pythonbuild"
+readonly buildTgz="${buildHome}/py.tgz"
+
+# Already defined by sequencer.sh, but may be overwritten
+#readonly seq_configName="${sq_scriptName:?}.cfg"
+#readonly seq_configTemplate="${seq_origin:?}/${sq_configName:?}.example"
+
+sq_aptOpt=
+sq_config=0
+req_pyVersion=
+sq_pyVersion=
+
+seq_config() {
+  ## or to use sequencer api with global config file:
+  if ! initSeqConfig "${seq_configName:?}" "${seq_configTemplate:?}" ; then
+    # End if no configuration file exists
+    dry || return 1
+  fi
+
+  ## Apt cmdline option to suppress user interaction
+  interactive || sq_aptOpt="-y"
+
+  ## Disable error checks if external scripts are used
+  ## e.g. error on unbound variables
+  #disableErrorCheck
+
+  ## Return of non zero value will abort the sequence
+  return 0
+}
+
+step_1_info() { echo 'Status'; }
+step_1_alias() { echo 'status'; }
+step_1() {
+  local pyPath=
+  if pyPath=$(which "python${sc_pyVersion}") ; then
+    info "$(python${sc_pyVersion} --version) installed"
+    info -a "at ($pyPath)"
+  else
+    info "${toolName} version ${sc_pyVersion} not installed"
+  fi
+}
+
+step_10_info() { echo 'Setup build environment'; }
+step_10_alias() { echo 'buildsetup'; }
+step_10() {
+  exe apt update
+  exe apt install "${buildDeps[@]}" ${sq_aptOpt}
+}
+
+step_11_info() { echo "(Alt)install given version"; }
+step_11_options() { echo "[VERSION]"; }
+step_11_alias() { echo "altinstall"; }
+step_11() {
+  shift
+  local downUrl=
+  local version="${sc_pyVersion:?}"
+  [ -f "${buildTgz}" ] && return 0
+  [ -n "${1:-}" ] && version="${1}"
+  if ! downUrl="$(getSourceUrl "${version}")" ; then
+    fatal "Could not determine download link for version ${1:-}"
+  fi
+  info "Downloading $sq_pyVersion from $downUrl"
+  exe mkdir -p "${buildHome}"
+  exe wget -O "${buildTgz}" "${downUrl}"
+}
+
+step_12() {
+  local lPrefix=
+  [ -z "${sq_pyVersion}" ] && getSourceUrl "${sc_pyVersion}" >>/dev/null
+  exe cd "${buildHome}"
+  exe tar xf "${buildTgz}"
+  exe cd "Python-${sq_pyVersion}"
+  if [ -n "${sc_pyPrefix}" ] ; then
+    exe mkdir -p "${sc_pyPrefix}"
+    endReturn "Couldn't create prefix directory ${sc_pyPrefix}"
+    lPrefix="--prefix=${sc_pyPrefix}"
+  fi
+
+  exe ./configure --enable-optimizations "${lPrefix}"
+}
+
+step_13() {
+  [ -z "${sq_pyVersion}" ] && getSourceUrl "${sc_pyVersion}" >>/dev/null
+  exe cd "${buildHome}/Python-${sq_pyVersion}"
+  # Leave one processor for other tasks
+  exe make -j 3
+}
+
+step_14() {
+  local lInstall="altinstall"
+  [ -z "${sq_pyVersion}" ] && getSourceUrl "${sc_pyVersion}" >>/dev/null
+  exe cd "${buildHome}/Python-${sq_pyVersion}"
+  [ -n "${sc_pyPrefix}" ] && lInstall="install"
+  exe make "${lInstall}"
+}
+
+# getSourceUrl <VERSION>
+#  <VERSION>  :  can be only the major version or more specific
+#
+# Get the download URL for the latest .tgz file for the given version.
+#
+# Examples (all valid):
+#   getSourceUrl 3
+#   getSourceUrl 3.10
+#   getSourceUrl 3.10.8
+getSourceUrl() {
+  [[ ${1:-} =~ ^[0-9\.]+$ ]] || return 1
+  local downUrl=
+  downUrl="$(curl --silent -L "https://www.python.org/downloads/source/" | \
+    grep --max-count 1 -Po "href=\"\K.*Python-${1//./\\.}.*?(?=\")")"
+  [[ -z "${downUrl}" ]] && return 1
+  sq_pyVersion="$(grep -Po "python/\K.*?(?=/)" <<<"${downUrl}")"
+  echo "${downUrl}"
+}
+
+# shellcheck disable=SC2034 # Appears unused
+readonly sqr_minVersion=16
+# shellcheck disable=SC1091 # Don't follow this source
+. /usr/local/bin/sequencer.sh