tools/download-rust-crate

   1 #!/bin/bash
   2
   3 set -o pipefail
   4
   5 RUST_TEMPLATE="lfs/rust-rand"
   6
   7 fetch_latest_version() {
   8         local name="${1}"
   9
  10         if ! curl --silent "https://crates.io/api/v1/crates/${name}" | \
  11                         jq --raw-output .crate.max_stable_version; then
  12                 echo "${0}: Could not find the latest stable version of ${name}" >&2
  13                 return 1
  14         fi
  15 }
  16
  17 main() {
  18         local name="${1}"
  19         local version="${2}"
  20
  21         if [ -z "${name}" ]; then
  22                 echo "${0}: You need to pass a name of a crate" >&2
  23                 return 2
  24         fi
  25
  26         if [ -z "${version}" ]; then
  27                 version="$(fetch_latest_version "${name}")"
  28                 if [ -z "${version}" ]; then
  29                         # error message has already been printed
  30                         return 1
  31                 fi
  32         fi
  33
  34         # Compose download URL
  35         local url="https://crates.io/api/v1/crates/${name}/${version}/download"
  36         local download="$(mktemp)"
  37
  38         # Perform download
  39         if ! curl -L "${url}" -o "${download}"; then
  40                 echo "${0}: Could not download ${name}-${version}" >&2
  41                 unlink "${download}"
  42                 return 1
  43         fi
  44
  45         # Check if download is an orderly tar file
  46         if ! tar tvf "${download}" &>/dev/null; then
  47                 echo "${0}: Download is not a tar file" >&2
  48                 unlink "${download}"
  49                 return 1
  50         fi
  51
  52         # Hash the downloaded file
  53         local b2sum="$(b2sum "${download}" | awk '{ print $1 }')"
  54         if [ -z "${b2sum}" ]; then
  55                 echo "${0}: Could not hash download" >&2
  56                 unlink "${download}"
  57                 return 1
  58         fi
  59
  60         local filename="cache/${name}-${version}.tar.gz"
  61
  62         # Move to final destination
  63         if ! install -m 644 "${download}" "${filename}"; then
  64                 echo "${0}: Could not move downloaded file to ${filename}" >&2
  65                 unlink "${download}"
  66                 return 1
  67         fi
  68
  69         # Remove download
  70         unlink "${download}"
  71
  72         # Create a new LFS file
  73         sed < "${RUST_TEMPLATE}" > "lfs/rust-${name}" \
  74                 -e "s/^VER.*/VER        = ${version}/" \
  75                 -e "s/^THISAPP.*/THISAPP    = ${name}-\$(VER)/" \
  76                 -e "s/^\$(DL_FILE)_BLAKE2.*/\$(DL_FILE)_BLAKE2 = ${b2sum}/"
  77
  78         echo "Done"
  79         return 0
  80 }
  81
  82 main "$@" || exit $?