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#! /bin/sh -e
url=$1
rev=$2
expHash=$3
hashType=$NIX_HASH_ALGO
if test -z "$hashType"; then
hashType=sha256
fi
if test -z "$hashFormat"; then
hashFormat=--base32
fi
if test -z "$url"; then
echo "syntax: nix-prefetch-bzr URL [REVISION [EXPECTED-HASH]]" >&2
exit 1
fi
revarg="-r $rev"
test -n "$rev" || revarg=""
repoName=$(echo $url | sed '
s,.*/\([^/]\+\)/trunk/*$,\1,;t
s,.*/\([^/]\+\)/branches/\([^/]\+\)/*$,\1-\2,;t
s,.*/\([^/]\+\)/tags/\([^/]\+\)/*$,\1-\2,;t
s,.*/\([^/]\+\)/*$,\1,;t
')
dstFile="bzr-export"
# If the hash was given, a file with that hash may already be in the
# store.
if test -n "$expHash"; then
finalPath=$(nix-store --print-fixed-path --recursive "$hashType" "$expHash" $dstFile)
if ! nix-store --check-validity "$finalPath" 2> /dev/null; then
finalPath=
fi
hash=$expHash
fi
# If we don't know the hash or a path with that hash doesn't exist,
# download the file and add it to the store.
if test -z "$finalPath"; then
tmpPath="$(mktemp -d "${TMPDIR:-/tmp}/bzr-checkout-tmp-XXXXXXXX")"
trap "rm -rf \"$tmpPath\"" EXIT
tmpFile="$tmpPath/$dstFile"
# Perform the checkout.
bzr -Ossl.cert_reqs=none export $revarg --format=dir "$tmpFile" "$url"
echo "bzr revision is $(bzr revno $revarg "$url")"
# Compute the hash.
hash=$(nix-hash --type $hashType $hashFormat $tmpFile)
if ! test -n "$QUIET"; then echo "hash is $hash" >&2; fi
# Add the downloaded file to the Nix store.
finalPath=$(nix-store --add-fixed --recursive "$hashType" $tmpFile)
if test -n "$expHash" -a "$expHash" != "$hash"; then
echo "hash mismatch for URL \`$url'"
exit 1
fi
fi
if ! test -n "$QUIET"; then echo "path is $finalPath" >&2; fi
echo $hash
if test -n "$PRINT_PATH"; then
echo $finalPath
fi
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