Install libxcrypt

This will make `libcrypt.so.2` available in the image. The GLIBC
variants of the header and libraries are deleted in order to force
applications to pick up the `libxcrypt` version.

docker/build_scripts/build.sh

@@ -102,6 +102,9 @@ cd ..
 rm -rf $SQLITE_AUTOCONF_VERSION*
 rm /usr/local/lib/libsqlite3.a
 
+# Install libcrypt.so.2
+build_libxcrypt "$LIBXCRYPT_DOWNLOAD_URL" "$LIBXCRYPT_VERSION" "$LIBXCRYPT_HASH"
+
 # Compile the latest Python releases.
 # (In order to have a proper SSL module, Python is compiled
 # against a recent openssl [see env vars above], which is linked

docker/build_scripts/build_env.sh

@@ -28,6 +28,10 @@ SQLITE_AUTOCONF_VERSION=sqlite-autoconf-3270200
 SQLITE_AUTOCONF_HASH=50c39e85ea28b5ecfdb3f9e860afe9ba606381e21836b2849efca6a0bfe6ef6e
 SQLITE_AUTOCONF_DOWNLOAD_URL=https://www.sqlite.org/2019
 
+LIBXCRYPT_VERSION=4.4.6
+LIBXCRYPT_DOWNLOAD_URL=https://codeload.github.com/besser82/libxcrypt/tar.gz
+LIBXCRYPT_HASH=4c33b80d3e1363c218ec6132bae0ea9eae181af9f9892939e90ec44b246ebe23
+
 GIT_ROOT=2.21.0
 GIT_HASH=7a601275abcc6ff51cc79a6d402e83c90ae37d743b0b8d073aa009dd4b22d432
 GIT_DOWNLOAD_URL=https://github.com/git/git/archive

docker/build_scripts/build_utils.sh

@@ -162,7 +162,8 @@ function build_git {
 
 
 function do_standard_install {
-    ./configure > /dev/null
+    local configure_args=$1
+    ./configure "$configure_args" > /dev/null
     make > /dev/null
     make install > /dev/null
 }
@@ -208,3 +209,17 @@ function build_libtool {
     (cd ${libtool_fname} && do_standard_install)
     rm -rf ${libtool_fname} ${libtool_fname}.tar.gz
 }
+
+function build_libxcrypt {
+    curl -fsSLO "$LIBXCRYPT_DOWNLOAD_URL"/v"$LIBXCRYPT_VERSION"
+    check_sha256sum "v$LIBXCRYPT_VERSION" "$LIBXCRYPT_HASH"
+    tar xfz "v$LIBXCRYPT_VERSION"
+    (cd "libxcrypt-$LIBXCRYPT_VERSION" && ./bootstrap && \
+        do_standard_install \
+        --disable-obsolete-api \
+        --enable-hashes=all)
+
+    # Delete GLIBC version headers and libraries
+    rm -rf /usr/include/crypt.h
+    rm -rf /usr/lib64/libcrypt.a /usr/lib64/libcrypt.so
+}